Application
Contents
1. Korn l Petri Dr L szl Balogh 11 09 2004 46 48 PROTEC lA lectronics Co Ltd EuroProt DRFP User s guide T 00 lt M oO Bi ac L Fig Nr Arrangement of PCB s DRFP EP BADE poe s oni LRQ RS Es pes npe pe pedes ne IESENE ETT TANE elalele ejolr ol 5 e 9 el Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 47 48 PROTECTA Electronics Co Ltd EuroProt DRFP User s guide Name in EE zw o el 8 0 0 000000 ajo o NEN 5 JeET ZSIDMT 6 crZ iDMT mero 4 8 CT ThOL EN S T des i T0 SELFTEST 1 SELFTEST alke 1 ILOW GAS 2 VTmidgetCB 3 CBCLOSED 4 CBOPEN 5 MANUAL CLOSE 6 JARDISABLE 7 ARENABLE 8 ARSTART Le opro 1 8 1 Supplys 2 Supply f 3 Clock syncront 4 Clock syncron 1 R41 06 To Trip Output To Close Output K8 Name 1 NP 11 NP 12 NP 13 NP 14 NP 15 Z D 3 D E EM EI D 5 A 7 N D eee sd DRFP EP M A 4804 48V ame 4 D 5 To Trip Output o Trip Output if exist o Close Output 0404 5 5 5 I5 Id t Iis Olo o SPIP Ol lo o OO Cc Nilo A aja o mn OPTO 9 12 External Connections A Supplye Su2. 000 the VT circuit poo Second trip coil is to be operated The enabling of the functions is solved with PROTLOG logic equations As an example the enabling of the first zone The Fig shows the default setting If the check box Always on is checked then the first zone cannot generate a trip command CT primary nom 2500 i M 2 8 Equations Remaining resources ES Always on O x Enabling the first distance zone with PROTLOG logic equation example Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 10 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 1 2 3 Outputs of the function The functions give trip command on the relay contacts To I Trip Output and To II Trip Output 1f any and deliver status signals indicating the operation 2 1 2 4 Displayed information Displayed information on the integrated LCD of the device in the 7es menu Measured analogous signals a A Measured voltage Calculated resistance value in secondary Ohms Cu Ci Calculated reactance value in secondary Ohms Cu Ci Distance to fault for the last event in km Digital information 1 status bits E oO EE E e Se 2 status bits General start signal General trip command 2 1 2 5 Messages of the function The messages on the LCD of the device related to the funct
3. protection trip minimal duration Reclaim time amp H 6HBHHH 18 gt amp H 6HBHBH 18 gt RGD 18 5 Parameters from device set 1 of 8 EQUATION TIMER PARAMETERS User equation timer delay 2H 6BHBHHB 18 gt User timer mode User equation timer delay Zb 18 gt User timer mode User equation timer delay 1 6808 1 User timer mode MISCELLANEOUS PARAMETERS Disable operation messages on LCD Disable trip and close coil test 2nd tripping coil involved in coil test LED latched 2 LED latched 3 LED latched 4 LED latched 5 LED latched 6 LED latched 2nd analogue output 1 I 2 U 3 8 4 0 S P E KE F CostFi gt OMMUNICATION PARAMETERS Station code 5 Device code Baudrate 7668 Fiber optic loop CH N0 1 Y E8 gt 5 Comm port H Opto 1 R5232 gt 5 autiont Changing any of these parameters will probably terminate he connection with the device In this case restart communication with the new parameters FAL ms OPERATING H ms OPERATING Hz OPERATING Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 42 48 PROTECTA Electronics Co Ltd EuroProt DRFP User s guide 2 9 2 The On line window Es 2 On line information updated EASURED VALUES Protection start d IKZ R I2t Thermal OL IDMT Ux U gt AR disabled LW E an EE DR EN EN DR Hu H A
4. CO Pn impare n i temperature S PEE temperature Mine ia er 1 Rated current of the line as percent of the rated CT current e nom overheat Tp AI AA 1 Rated over EES at rated current AAA em tiom The enabling of the functions is solved with PROTLOG logic equations As an example the enabling of the first zone of the distance protection 1s shown 1n Chapter 2 1 2 2 The Fig shows the default setting If the check box Always on is checked then the first zone can not generate a trip command The logic variable to be handled is ThoL trip block 2 39 29 Digital outputs of the function The functions give trip command on the relay contacts To I Trip Output and To II Trip Output 1f any and deliver status signals indicating the operation 2 3 2 4 Displayed information Displayed information on the integrated LCD of the device in the 7est menu Measured analogous signals Measured current related to the In CT Calculated temperature above the ambient temperature Digital information LCD information 1 status bits ThWarn signal of the thermal protection pos 6 2 status bits ThTrip Trip command of the thermal protection Dos Start General start signal pos 2 Trip General trip command pos 3 Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 18 48 PROTEC A EuroProt DRFP User s guide E lectron
5. FORWARD direction H undervo Je controlled E Un TUT 1 gt R Cx1B xGuxG1 n 16 Cu2C1i gt R R AR Time delay ZONE 2 FORWARD direction H or 22 R Cx1HBxCGuxi 1 Cx1BxGusGL Direction Time delay 45 120 1 amp iH i1HHHH 71 gt amp iH iWHHHH 71 gt H SA 71 gt 6 58 1 amp H 6HHHH 71 gt amp 1H 2HHHH 71 gt amp 1H 2HHHH 71 gt amp H 5H i gt lt 4 208 1 gt A PES amp H 6HHHH 1H d mOhm nOhm Ka bf mz includes FAULT LOCATOR 166680 mOhm 26668 mOhm DA x 134 2 SHH ms FONE 3 FORWARD direction A or 22 or REVERSE direction R alt KRIER n Walt KRIER m t A ER Direction Time delay FONE 4 FORWARD direction A or 22 or REVERSE direction R E ES ETE A n Claus R A nAH Direction Time delay 1H 2HHBHH 71 gt amp 1H 2HHHH 71 gt amp H 5H 1 amp H 2HBHH 1 gt 4 1 2 3 gt H 66668 1H amp 1H 2HHHH 1H amp iH 2zHHHH 1H amp H 5H 1 amp H 2HHB 1 gt Klee amp H 6HHHH 183 ZONE 5 REVERSE direction 1 R Cu m0 1 dd Aru is Time delay amp 1H 2HHHH 10 gt amp 1H 2HHHH 71 gt 6 58 1 amp H 5H 1 amp H 6HHHH 71 gt DUERHERD LINE PARAMETER 2788 mOhm 16568 mOhm 5H z 134 x 2 3660 mz 1 or 3 4246 mOhm 16366 mOhm 5H x an AGE ETE E 186 20668 18 gt Length B 1HBH 1 CT primary nominal C 1HB8H 25HB 71 UT primary nominal i AH E 151015 zi gt
6. guide t 23 expired Distance protection zone 3 time over t Z4 expired Distance protection zone 4 time over t Z5 expired Distance protection zone 5 time over IDMT expired Th OL expired U lt expired U gt expired Zl tripped Z2 tripped Z3 tripped Z4 tripped Z5 tripped IDMT tripped Th OL tripped U lt tripped U gt tripped Prot started Prot tripped Zl trip blocked Z2 trip blocked Z3 trip blocked Z4 trip blocked Z5 trip blocked IDMT trip block Th OL tr blocked U lt trip blocked U gt trip blocked AR blocked CB failure Definite trip Self test error CB status error 1 timer running 1 timer expired 2 timer running 2 timer expired 3 timer running 3 timer expired Overcurrent function time over Thermal overload function time over Undervoltage function time over Overvoltage function time over Distance protection zone 1 trip command Distance protection zone 2 trip command Distance protection zone 3 trip command Distance protection zone 4 trip command Distance protection zone 5 trip command I DMT function trip command Thermal overload function trip command Undervoltage function trip command Overvoltage function trip command General start General trip command Distance protection zone 1 trip command disabled Distance protection zone 2 trip command disabled Distance protection zone 3 trip command disabled Distance protection zone 4 trip command disabled Distance protection zone 5 trip command disab
7. input parameter If this parameter is set to HIGH the VT circuit is considered to be healthy if the input signal VT midget CB is energised If the parameter is set to LOW the VT circuit is considered to be healthy 1f the input signal VT midget CB is not energised 2 1 1 4 Switch on to fault logic The relay has an input dedicated as Manual close to receive the close command from the auxiliary contact of the CB control switch When this input goes high it is assumed that the line has been energised and the reclaim timer is started If a fault occurs while this timer is running after receipt of manual close command the relay will trip instantaneously in any zone 2 1 1 5 Available communication schemes Zone extension and permissive underreach schemes with programmable logical input levels can be achieved using PROTLOG equations 2 1 1 6 Fault locator DRFP EP has an integrated fault locator Based on setting the parameter Xn total reactance of the line the fault locator calculates the fault location in percent of the full length of the line Fault locator is activated in Zone 2 therefore it only works if the fault occurs in the area of this zone The result 1s also stored in the event recorder For the last fault the LCD on the front panel of the device displays this distance as well Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 7 48 PROTECTA
8. of these timers the output relay contacts To I Trip Output and To II Trip Output 1f any or the output To Close Output are closed x Command Command commana Window for CB control 2 7 6 The disturbance recorder function The CPU module includes a simplified disturbance recorder function In the DRFP EP device the disturbance recorder handles the sampled analogue data and the status signals This function has not a man machine interface 1t can communicate only with a PC via fibre optic connection The records can be analysed on the PC screen can be sent to a central engineering workstation or can be printed as well The summary of the analogue signals sent to the disturbance recorder function Current of the CT ThOL input related to the In CT Current of the CT Z lt input related to the In CT Voltage of the VT input related to the Vn VT Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 33 48 PROTEC A lectronics Co Ltd EuroProt DRFP User s guide summary of the status signals sent to the disturbance recorder function Explanation State of LOW GAS input ana signal of the miniature circuit breaker in the voltage transformer circuit Status of switch 2 on the front panel of the device Automatic reclosing disable enable Latched state of the LOW GAS input VT MCB inp SW2 AR dis en VT MCB OK Sta
9. primary I 328 66 Cix Ci il 145 45 Ohm Last fault 6 66 ki 6 66 KUA F Th OL gt n location IFTE ER 1H9 97 kfi2s 5TARTED Protection trip CPRERLA RM overtemperature H H counter 49 69 Hz A primary 320 00 CuxCi fl 145 45 Ohm 6 66 klar km EA PI RED Us cz secundary gt primary ER On line information COUNTERS A UT midget CH EEPROM A D or ADI amp started Z2 5 L A LAR SCH started started started started Th L prealarm Trip command INPUT SERVICE INFORMATIO Low gas UT midget CH CB closed CH open Manual close AR disable AR enable AR start ADI status ADI error CB coil test RAM battery Lix ZAR L A expired expired expired at expired ant expired Th L expired IDMT expired U lt expired U gt expired Close command Remote reset Input 1 Input Input Input Input Input Input EE acap Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 43 48 PROTECTA EuroProt DRFP User s guide 2 9 3 The Evaluated events window Eyaulated events demo picture Oo xj a Event recording start HHB HH BB BH D CAA B Event recording end 40 06 HR BA BHH HH HB MEASURED VALUES IXTh OL 8 A primary ILZ H H primary U 8 U primary Fault location Hx START
10. 1 09 2004 31 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 7 2 Application of signals from the digital inputs There are dedicated and free digital inputs 2 7 3 Application of output relays There are dedicated and free output relays The output relays with fix assignment issue the trip and close commands the free relays can be programmed using the PROTLOG equations 2 7 4 Application of the analogue outputs The DRFP EP factory configuration of the EuroProt devices is extended with an analogue output module containing two 4 20 mA output channels Both outputs can be loaded up to 350 Ohm The signal of the output channel No 1 is proportional to the distance to fault 2 Length parameter setting The signal of the output channel No 2 can be assigned with parameter setting Qe analogue output Compiled by Approved by Date Page Kornel Petri Dr Laszlo Balogh 11 09 2004 32 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 4 QO 40000 var 0 O 2 JP 40000 KW 6 Dt SO SOOO KASS 0 0 0 2 7 5 Circuit breaker control function A dedicated window of Protect for Windows software is prepared to initiate switching commands to the circuit breaker This window is displayed on the PC screen according to the figure below Both switching commands start a 300 ms timer During runtime
11. Digital signals Signal O Warning signal of the thermal protection Th OL_expired Trip command of the thermal protection General trip command Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 20 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 4 Over undervoltage protection 2 4 1 Principle of measurement The algorithm measures the voltage and for this voltage the base Fourier component 1s calculated The function starts 1f the voltage 1s above below the setting value 2 4 2 Realisation of over undervoltage protection function 2 4 2 1 Analogue inputs of the function The analogue input signal of the function is the voltage 2 4 2 2 The parameters of the function The function needs setting of the following parameters U lt Un VT 5 120 1 Voltage setting value for the undervoltage S function related to the voltage transformer rated value Un 70 130 1 Voltage setting value for the overvoltage function related to the voltage transformer rated value VT primary 6000 Primary rated voltage of the voltage nom 10 transformer divided by 10 calculated for the rated voltage of the voltage input 110 V BE wis 000 Ju Delay time of the undervoltage function Te does Delay time of the overvoltage function The enabling of the functions is solved with PROTLOG logic equations As an example the enabling
12. EuroProt DRFP User s guide 2 1 1 7 Inactivating the zones Each zone can be set to be inoperative using PROTLOG system A user defined logic equation can be set to block the zone from tripping Z1 trip block Z2 trip block Z3 trip block Z4 trip block Z5 trip block The measuring starting and timing procedure remains active while the zone trip 1s blocked this way the user has the opportunity to use a zone element for signalling or other purposes Blocking the trip of the zone forces the protection starting and tripping logic to 1gnore the start and trip signals of the appropriate zone 2 1 2 Realisation of distance protection function 2 1 2 1 Analogue inputs This function measures the current and the voltage of the line I CT Z lt U VT To single phase AC traction line ASA Figure 2 Correctly directed external connections Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 8 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 1 2 2 Parameter setting The function needs setting of the enin parameters U lt Z1 Un VT 120 Voltage setting of the first zone undervoltage s function below which the first zone 1s ET RE EE inibi R setting of the polygon mohm X1 10 Cu Ci IA X setting of the REES mOhm LLL Angle setting of the polygon in negative R reach SE RL Angle setting of the polygon in negative
13. OPEN In case of contradiction a timer is started the expiry of which indicates CB discrepancy The timer of the CB failure protection can be stopped by the open state of the CB If the delay time expires the following status variables are set to logic 1 state CB failure Definitive trip and AR disabled The function needs setting of the following parameters t CB failure 60000 10 Delay time for the CB failure protection TR function vi discrep 60000 39 Delay time for the CB discrepancy state Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 28 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd The messages of the function are CB status discrepancy CB failure 2 7 Additional implemented functions 2 7 1 PROTLOG equations The available digital status signals are the input variables of the PROTLOG equation system which can be freely programmed to set output variables of the equation system 2 7 1 1 Inputs of the logic equations The available inputs for the logic equations are listed in the following table ITE ES E 22 started 23 started Z4 started 25 started A AE A EE Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 29 48 PROTECTA Electronics Co Ltd E EuroProt DRFP User s
14. PROTECTA Electronics Co Ltd EuroProt complex protection IDIRIF IPEF factory configuration ID No FR 13 13860 01 Budapest 2004 P ROTEC A EuroProt DRFP User s guide Electronics Co Ltd CONTENTS Vain c aracieristcs of the function realisation Ome Tunc lon om Mme LOL O MEIASUFEMEN e Evaluated events WInaow PEER TUTTO O A EE A NETA A AAA AAA PGE AMA ONTOS WTO A ee Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 2 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 1 Application The members of the EuroProt complex protection series are basically modular devices The modules are assembled and configured according to the required protection functions This manual describes the specialities of one of the numerous applications the DRFP EP factory configuration The general user s manual for the EuroProt devices 1s the document EPCP 2004 EuroProt complex protection hardware and software manual further EPCP 2004 which provides all common information to the members of the EuroProt complex protection series The DRFP EP complex numerical device made by PROTECTA Co Ltd 1s pre configured for Digital Railway Feeder Protection This device can be applied for all protection and auxiliary functions for single phase AC traction supply systems 1 1 Features The main feat
15. TRIF dl d t GH L4 S E L94 BA Thermal OL CPREALARM gt I DMT Ux a UA A AR disabled Auto reclose command Definite trip Manual reclose 2 9 4 The Equations window Example Equations Remaining resources EI Low gas inp UT midget CB OK I Input 13 CB failure ini x A Previous i Self test warning evt Help di Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 44 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 9 5 The Controls window EE Eommand Eommand Command 3 Design of DRFP EP devices The information related with the design of the devices is described EPCP 2004 documentation The arrangement of the modules the connections is specific to the ordered device All these information is supplied as an attachment of the delivered device PROTECTA Electronics Co Ltd Budapest K sm rk t 7 H 1158 Tel 36 1 415 3800 Fax 36 1 414 0140 Development Dept Tel fax 36 1 414 0141 E mail protecta protecta hu Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 45 48 PROTEC A lectronics Co Ltd EuroProt DRFP User s guide 4 Drawings Compiled by Approved by Date Page
16. UT midget GB OK level on input Low gas input latched THERMAL OUERLOAD PARAMETERS Thermal overload trip Bt 8n ali Thermal overload pre alarm Bp 8n x1HHB Line nominal current tInl IntCT gt LAB Line temperature rise at Inl n 30 256 80 254 18 568 cH 2HH Time constant ic 4 Z HAHA OUER AND UNDERVOLTAGE PARAMETERS Ux lt Un TUT 15 Time delay U gt lt nIUT 1 Time delay Ibasic CTnon i IDMT M const CE de 128 15 15151515 18 13H 1 CH 65HBHH 1H 76 GHAHHHA 115 Dn IDMT PARAMETERS IDMT typet KK H 28 158 15 amp 1 256 1 Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 41 48 PROTECTA Electronics Co Ltd EuroProt DRFP User s guide 5 Parameters from device set 1 of 8 CB PARAMETERS tX GB failure amp H 6HBHB 18 160008 ms tCCH discrep CH 7160 1666 ms AAA coil supervision tH 686 15 J3HHH Zi det L A LA AUTO RECLOSURE FUNCTION PARAMETERS stage initiates auto reclose stage initiates auto reclose stage initiates auto reclose stage initiates auto reclose IDMT initiates auto reclose Auto reclose disabled CIF YES it cannot be enabled from external input Manual close input generates close command Dead time 1 amp H 5 5 1 Dead time 2 H 71517 z 1b Close command duration Manual trip duration and
17. X reach Env eate TO Cus 20000 R setting of the polygon e X2 ENEE 20000 X setting of the AA 5 mOhm R2 X2 scia as oa RN RN setting of the polygon in negative R S reach X2 R2 Angle setting of the polygon in negative X id reach Load impedance cut off Ede rpm m X3 10 Cu Ci CC KEE t ARA ec X setting of the AR l mOhm E cul Ei reach uM nar reach Ge ES Direction and load impedance cut off 0 3 toi Z3 BK Time delay RA QRIOSCUASCI 20000 R setting of the polygon mOhm X4 10 Cu Ci crac NES X setting of the rei 5 l mOhm Le reach UII n reach Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 9 48 PROTECTA Electronics Co Ltd E EuroProt DRFP User s guide z4 direction 0 3 t Z4 lt ms R5 10 Cu Ci mohm X5 10 Cu Ci mohm R5 X5 X5 R5 o 6 IT IT BB BB Direction and load impedance cut off Time delay R setting of the polygon X setting of the polygon Angle setting of the polygon in negative R reach Angle setting of the polygon in negative X reach e O ee e medeis ms XnLine 10 Cu Ci mOhm 20000 Total reactance of the line A VT primary nom 10 V VI MCB OK level HIGH 2 US trip coil yes 6000 1 CT primary rated current VT primary rated voltage divided by 10 e g for 120 000 V this value is 12
18. atic reclosing function 1s disabled pos 4 2 5 2 9 Messages of the function The messages related to the function Definite trip l auto reclose 2 auto reclose To disable these messages a binary parameter must be set Ee SC mess When set to the messages will not be displayed yes 2 5 2 6 Event recording On the LCD of the device the displayed events related to the function are as follows AR was blocked Aut reclose Definite trip The Protect for Windows software displays the digital events in a separate window See details in chapter Digital events Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 27 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 5 2 7 Evaluated events The Protect for Windows software displays the evaluated event in a separate window See details in chapter Evaluated events 2 5 2 8 Event counters The counter related to this function counts the close commands Close command cnt 2329 Signals recorded in the disturbance recorder The integrated disturbance recorder records the following signals Digital signals 2 6 Breaker failure protection If any of the protection functions generates a trip command and the CB 1s closed then the timer of the CB failure protection starts The CB status is indicated by the two dedicated digital inputs CB CLOSED and CB
19. ce protection with 5 independent zones One of the basic functions of the complex protection 1s the distance protection For the first zone the operation 1s based on three sampled voltage and current values This algorithm 1s very fast and insensitive of CT saturation The operation of the first zone protection is dependent on the starting of a dedicated undervoltage function as well For the other four zones the algorithm operates with Fourier filtering Using this method the operation is optimised for distorted waveform If the calculated impedance is within the polygon characteristics of the zone the function starts the timer When the pre set time is over the function generates trip command 2 1 1 Distance characteristics Zone 1s directed forward the operation depends on undervoltage function Zone 2 is directed forward and can operate with load impedance cut off Zone 3 and 4 can be directed forward or backward and can operate with load impedance cut off Zone 5 has reverse direction Each of the zones has a quadrilateral characteristics Parameters of the characteristics are as follows Undervoltage control for zone 1 a Resistive reach individually for each zones a Reactive reach individually for each zones a R X angular coefficient individually for each zones X R angular coefficient individually for each zones Direction for zones 3 and 4 and load impedance cut off for zones 2 3 and 4 Compi
20. dance measuring algorithm determines Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 6 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd the direction of the fault based on the stored voltage signal and will latch until either the voltage becomes healthy again or the current drops below the threshold Polarising initiates when voltage drops below 5V for the three point algorithm and latching ends when the voltage exceeds about 40 V These values are 5V and 8V at Fourier filtering algorithm 2 1 1 2 Energising of the line If the line is energised while having a close up fault the voltage level can be under the polarising threshold making the relay unable to determine the direction of the fault In such a case the relay assumes that the fault 1s in forward direction 2 1 1 3 VT circuit supervision via MCB auxiliary contact The impedance relay has to be blocked in case of a failure in VT circuit This is achieved by monitoring the signal of VT miniature midget CB via an optically coupled isolator This signal has to be active VT circuit is healthy for at least 200ms in order to enable impedance protection Energising this optical isolator can mean either the healthy state of the VT circuit or it has a failure The active level of the MCB indicating the healthy VT circuit can be selected by setting the related VT miniature midget CB OK level on
21. e device is described in EPCP 2004 manual The man machine interface of the device 1s the integrated 2x16 character LCD the simple keyboard with 6 pushbuttons and the 7 LED s on the front panel The device can be supervised easier with a connected PC which runs the windows based operating program Protect for Windows developed by Protecta Co Ltd The user s manual for all these possibilities 1s the EPCP 2004 documentation The medium for the external communication is the 2 kV isolated serial RS 232 interface located on the front panel of the device or the two integrated fibre optic interfaces connectors on the back panel For the serial communication please find detailed information in the EPCP 2004 documentation Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 4 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd 2 The protection functions The DRFP EP complex numerical protection implements the following protection functions for single phase AC traction supply systems distance protection with 5 zones overcurrent time protection IDMT thermal protection over undervoltage protection automatic reclosing These functions are independent of each other they can be set individually The functions can be individually set to be operative or inoperative The following chapters describe the protection functions 2 1 Distan
22. ection functions distance protection overcurrent protection etc or an external command received on a digital input can initiate reclosing as well 2 5 2 2 The parameters of the function The function needs setting of the following parameters ee eel A Dead time Dead time for the second reclosing S Close 60000 10 Impulse time of the close command Minimal impulse time of the trip command E Ko time Tip HELD 60000 A Edi ndi PEN Start AR yes Z2 lt start AR yes Distance protection Zone benc ERN starts automatic reclosing Distance protection Zone 2 starts automatic reclosing 1 Distance protection Zone 3 starts automatic reclosing Z4 start AR yes IDMT start AR yes AR disable yes IF E reclosing reclosing for enabling is possible se start AR 2 yes Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 26 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 9 2 9 Digital outputs of the function The function gives trip command on the relay contacts To LI Trip Output and To II Trip Output 1f any delivers status signals indicating the operation The close command is generated to output To Close Output 2 5 2 4 Displayed information Digital information LCD_information 2 status bits Trip General trip command pos 3 AR disabled Autom
23. ics Co Ltd 2 3 2 5 Messages of the function The messages related to the function Th overload tripped Definite trip To disable these messages a binary parameter must be set rub 2 mess When set to the messages will not be displayed yes 2 3 2 6 Event recording The event recorder function records the following events with time stamp See details of event recording in the EPCP 2004 documentation The integrated LCD of the device can display the following messages Th OL alarm Th OL tripped Definite trip The Protect for Windows software displays the digital events in a separate window See details in chapter Digital events 2 35 21 Evaluated events The Protect for Windows software displays the evaluated event in a separate window See details in chapter Evaluated events 2 3 2 8 Event counters The thermal protection function involves the following counters displayed on the integrated LCD of the device ThOL warning cnt ThoL expired cnt Trip command ent The counter values are displayed in the On line PC screen as well Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 19 48 PROTECTA EuroProt DRFP User s guide 2 3 2 9 Signals recorded in the disturbance recorder The integrated disturbance recorder records the following signals Analogue signals In CT
24. ion Zl lt tripped Z2 lt tripped Z3 lt tripped Z4 lt tripped Z5 lt tripped Definite trip Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 11 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd To disable these messages a binary parameter must be set e SE Mess When set to the messages will not be displayed yes 2 1 2 6 Event recording The event recorder function records the following events with time stamp See details of event recording in the EPCP 2004 documentation The integrated LCD of the device can display the following messages Zl started Z2 started Z3 lt started Z4 lt started Zb started Zl tripped Z2 tripped Z3 tripped Z4 tripped Z5 lt tripped Definite trip The Protect for Windows software displays the digital events in a separate window See details in chapter Digital events 2 1 2 7 Evaluated events The Protect for Windows software displays the evaluated event in a separate window See details in chapter Evaluated events 2 1 2 8 Event counters The distance protection function involves the following counters displayed on the integrated LCD of the device Zl lt start cnt Z2e start cnt 43 start enis 44 start cuts Z5 lt start cnt Zl lt expired cnt Z2 lt expired cnt Z3 lt expired cnt Z4 lt expired cnt Zb e
25. ite trip signal by taking the AR enable and blocking conditions into consideration Reclose command will start the reclaim timer If a consecutive fault occurs after the reclose command within the reclaim time the procedure results in a definite trip blocking any further close command for a period of reclaim time Automatic reclosing function has several possibilities of enabling and blocking AR disable parameter If this binary parameter is set every trip and external AR start signal will cause a definite trip signal and no reclose command will be issued Resetting this parameter will not automatically enable automatic reclosing function All other blocking conditions listed below have to be inactive in order to enable automatic reclosing External AR DISABLE and AR ENABLE signals These signals operate an internal SET RESET flip flop An impulse on AR DISABLE will set the blocking condition An impulse on AR ENABLE will reset this blocking condition if AR DISABLE input 1s not active at the same time If this blocking condition 1s set every trip and external AR START signal will cause a definite trip signal and no reclose command will be issued AR stepl inhibit AR step2 inhibit PROTLOG equation outputs While these signals are active every trip and external AR START signal will cause a definite trip signal and no reclose command will be issued LOW GAS external input As long as this signal is active no close and trip com
26. l inverse Type 0 0 14 Iu N I 0 02 1 E Very inverse Type 1 T T Sek E Extremely inverse Type 2 80 For all cases the rated current Iy and the time multiplier Ty must be set 2 2 2 Realisation of the function 2 2 2 1 Analogue input of the function The analogue input of the function 1s the current measured on dedicated current input IV COITU Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 14 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 2 2 2 The parameters of the function LCD text Explanation eee MEINE 3E Lm inverse 1 very inverse 2 extremely inverse IDMT M const Time multiplier multiplied by 20 M Jeck EES Ctnom 100 Current setting related to the rated current of the S ler multiplied by 100 E g for setting of 0 5 the value to be set 1s 50 The enabling of the functions is solved with PROTLOG logic equations As an example the enabling of the first zone of the distance protection is shown in Chapter 2 1 2 2 The Fig shows the default setting If the check box Always on is checked then the first zone cannot generate a trip command The logic variable to be handled is IDMT trip block 2 2 2 9 Digital outputs of the function The functions give trip command on the relay contacts To I Trip Output and To II Trip Output 1f any and deliver status signals indicating
27. led I DMT function trip command disabled Thermal overload protection trip command disabled Undervoltage protection trip command disabled Overvoltage protection trip command disabled Automatic reclosing disabled Circuit breaker failure Definite trip command Self test function detected error Circuit breaker status signal error Free programmable timerl is running Free programmable timerl time over Free programmable timer2 1s running Free programmable timer2 time over Free programmable timer3 1s running Free programmable timer3 time over The inputs on the PC screen marked with character are latched status signals Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 30 48 P ROTEC A EuroProt DRFP User s guide Electronics Co Ltd 2 1 1 2 Outputs of the logic equations The possible outputs of the logic equations are listed in the following table LED2 1 Parset active The parameter set No 2 is active The parameter set No 3 is active 2 7 1 3 Programming the PROTLOG equations The PROTLOG equations can be programmed with the connected PC only using Protect for Windows software The method of programming is a graphical method described in EPCU 2004 documentation The man machine interface of the device does not support PROTLOG programming Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 1
28. led by Approved by Date Page Kornel Petri Dr Laszlo Balogh 11 09 2004 5 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd Reverse zone Load impedance cut off Fig 1 Quadrilateral tripping characteristics Normal load impedance should not start the distance relay Therefore the line of the characteristics determined by X R can be mirrored to axis R in Zone 2 3 4 This can make the characteristics blind to the heavy load of the engine Parameter Direction can have the following values 0 forward direction with no load impedance cut off E reverse direction with no load impedance cut off 2 forward direction with load impedance cut off X R is negated so the line in the 4 quarter is turned into the 1 quarter 3 reverse direction with load impedance cut off X R 1s negated so the line in the 2 quarter is turned into the 3 quarter 2 1 1 1 Polarising The impedance measuring algorithms have to work correctly even if the voltage drops to nearly zero due to a close up fault A synchronous polarising system has been installed in order to decide the appropriate direction of the fault in such cases The system 1s based on continuously storing the healthy voltage signal into a buffer until the voltage collapses This healthy signal 1s available for about 80 ms after the drop of the voltage If the current exceeds the minimal threshold 25 3096 of In CT the impe
29. losing cycles Main characteristics of the automatic reclosing function e reclosing stage e reclosing stage 2 Both reclosing stages can be enabled or disabled independently of each other A possible full two stage reclosing sequence 1s shown on the following Figure Fault 1 Fault 2 Fault 3 ON OFF t tripl Laeadi t trip2 Lead t tips 0 treclaim 1 treclaim Trip 1 Trip 2 Trip 3 definite trip Reclosing 1 Relosing 2 Legend ON CBON OFF CB OFF A full reclosing sequence Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 24 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd The diagram above shows a full reclosing sequence if all cycles are enabled and the fault returns after each reclosing within the tjj444 time The protection function e g distance protection trips and starts the subsequent reclosing cycle If any of the cycles is disabled or the fault does not return then the part of the diagram or the subsequent cycles will be missing The dead times can be set independently of each other The tieclaim time 1s the same duration for both stages Automatic reclosing is generally started by the falling edge of the tripping signal if starting is not disabled by PROTLOG equations and the external input AR START The internal logic decides then whether to start a timer for dead time interval or to issue a defin
30. mand is issued and every internal trip condition and external AR START signal will cause a definite trip signal The low gas information is latched until acknowledgement Impulse on MANUAL CLOSE input automatic reclosing command and definite trip start the reclaim timer While this timer is running the automatic reclosing 1s blocked and every trip and external AR START signal will cause a definite trip signal and no reclose command will be issued SW2 pushbutton pressing rising edge 1s a toggle switch for disabled enabled state of the automatic reclosing In some application MANUAL CLOSE input is used to force the relay to issue a close command This application can be enabled by the Close if MC inp binary parameter Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 25 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd Control commands on serial communication can force the relay to issue a trip or a close command A remote trip command in this case will always act like a definite trip and a remote close command will act as if it were a manual close The duration of the close command issued by the relay can be determined by the t Close parameter 2 5 2 Realisation of the function 2 9 2 1 Analogue inputs of the function The function does not need independent analogue input values the triggering 1s performed by other prot
31. nput variables The status signals of the IDMT protection function are input variables of the PROTLOG equations 2 2 2 10 Signals recorded in the disturbance recorder The integrated disturbance recorder records the following signals related directly to this function Analogue signal D A Measured current in the CT Z lt input related to the In CT Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 16 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd Digital signal Trip command of the IDMT function General trip command 2 3 Thermal protection The electrical equipment overhead lines motors transformers cables etc can withstand high overload current for a short time but a relatively small overcurrent which flows for a long time can lead to overheating and damages of the equipment The current dependent inverse type characteristics disconnect the circuit breaker quicker if the current increases but they cannot provide suitable protection against overheating This 1s because a considerably longer time is needed to reach the critical temperature if the heating starts in a cold state then in case of starting in a warm operating state This problem is solved by the thermal overload protection which calculates the temperature based on the measured current If the temperature approaches the critical temperature the function gene
32. ode oper Resetting timer Operating timer 2 User timer Timer operating mode mode oper Resetting timer Operating timer So user timer Timer operating mode mode oper Resetting timer F Operating timer 2 7 8 The LED signals If any of the protective functions operate the integrated LED s on the front panel give quick information about the event The LED assignment is based on PROTLOG equations The LED signals can be latched by parameter setting The function needs setting of the following parameters Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 35 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd HEU datei Lachingof EDT 7550 latched lachmgoflED2 See Limas 0 0 10 0 0 SS EE TED 0 00 00 0 5 LED latched TL TLachingofLEDS pArA dsceneg s qw qp se qp aingo LEDO 8 0 0 0 0 7 2 7 9 Displayed system messages If any of the protection functions operates or the self check system detects an error then a message 1s displayed on the Front panel LCD The following table lists the possible system message text elements EEPROM error Memory battery error Self test A D amp ADI error CB coil error 15V DC failure No events since last deletion DRFP PROTECTA 26 08 2004 The message m
33. of the first zone of the distance protection is shown in Chapter 2 1 2 2 The Fig shows the default setting If the check box Always on is checked then the first zone can not generate a trip command The logic variables to be handled are U lt trip block and U gt trip block The trip command of the over undervoltage function 1s allways a definite trip command 2 4 2 3 Digital outputs of the function The functions give trip command on the relay contacts To I Trip Output and To II Trip Output 1f any and deliver status signals indicating the operation Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 21 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd 2 4 2 4 Displayed information Displayed information on the integrated LCD of the device in the 7es menu Measured analogue signals LCD information Explanation U V Measured voltage Digital information LCD information Uk signal of the undervoltage function pos 7 Signal of the overvoltage function pos 8 2 status bits Start General start signal pos 2 Trip General trip command pos 3 2 4 2 5 Messages of the function The messages related to the function are U lt tripped U gt tripped Definite trip To disable these messages a binary parameter must be set ae SS mess When set to the messages will not be di
34. open Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 38 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd coir test Bleek Enabling the CB circuit check ll E state All other combinations cause error signal after this time delay 2 tei COLL Enabling the second trip coil Yes The messages in case of detected errors can be CB status discrepancy CB coil error Trip or close coil error 2 7 13 3 Operation of the self test output The self test output contact of the device operates 1f the check function of the device detects internal error See 2 6 10 1 or the CB circuit check detects error See 2 6 10 2 or the result Self test warning of the PROTLOG equation gets logic 1 2 8 Parameter packages The device can be pre programmed with up to 8 parameter packages The selection between the packages can be performed either in Protect for Window operating program in the menu Functions Parameter set or the first four parameter sets can be selected with PROTLOG equations as well This second selection mode has priority but it 1s possible only if the LCD menu item Parameter Comm Pset Enable enables the setting is this mode of operation In this case PROTLOG equations must be edited for the output variables 7 ParSet active 4 ParSet active e g using the digital input
35. pply KE SJANAUT 1 AN AUT 1 EE 5JANAUT2 GJANAUT2 TI PROTECTA Electronics Co Ltd Fig No FR 06 13148 01 Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 48 48
36. rates a warning signal and at the critical temperature trips the circuit breaker Calculation of temperature rise will be reset the calculated over temperature will be set to 0 after switching on the relay or downloading the parameter set 2 3 1 Principle of measurement The temperature of equipment relatively to the environment is determined by the balance of the internal generated heat and the heat radiated into the environment Based on this physical model a differential equation can be established the step by step solution of which 1s the principle of the thermal overload protection If the thermal parameters of the equipment are known then based on the measured current the thermal state temperature of the equipment can be calculated continuously The algorithm remembers the former load current and takes the natural cooling into consideration as well If the temperature approaches the setting value of the warning temperature the protection generates a warning signal and at the critical temperature trips the circuit breaker 2 3 2 Realisation of thermal protection function 2 35 2 1 Analogue inputs of the function The function measures the current on a dedicated input CT ThOL I XT CERO Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 17 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd 2 3 2 2 Parameters of the function
37. rogram system 1s supervised by a Watch dog circuit Additionally the program includes cyclic test routines as well This self check system supervises All internal errors of the device The CB circuits Additional error signalling can be configured using PROTLOG equations as well 2 7 13 1 Internal error check The internal error check supervises m the healthy state of the parameter memory the power supply of the event memory battery supported RAM m correct operation of the A D converter the correct ranges of the internal power supply voltage levels The messages in case of detected errors can be EEPROM error Memory battery error Self test A D amp ADI error 15V DC failure 2 7 13 2 CB circuit check If the check of the CB circuits 1s enabled then the continuous CB circuit test 1s carried out The principle and the operation of this test are described in EPCP 2004 documentation The specialities 1n this device are as follows The device can check two CB circuits if the second circuit is enabled by parameter setting The function can be disabled by parameter setting The function needs setting of the following parameters coil superv Time delay for signalling detected error in CB circuit supervision CB discrp Time delay for signalling CB status discrepancy One input should signal open state the other not closed state or one input should signal closed state the other not
38. s as input variables of these PROTLOG equations If more than one output 1s active then the first one in the numerical sequence decides the active parameter set Be careful all 8 parameter packages should contain the same equations concerning the four parameter packages Warning After program updating all 8 parameter packages must be set to avoid error signal of the self check function Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 39 48 PROTECTA EuroProt DRFP User s guide 2 9 The screens of the Protect for Windows operating program If a PC is connected to one of the serial ports of the device or the device is integrated to the Protection engineering workstation then the program provides the following screens for supervising the device 2 9 1 The Parameters window DEI Parameters from device set 1 of amp Dbirection 1 O m ly R Direction 3 FORWARD IMPEDANCE CHARACTERISTICS Direction H or 2 Direct ion 2 A HIS ee ch gt Direction H REUERSE IMPEDANCE CHARACTERISTICS Direction 1 or Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 40 48 PROTECTA Electronics Co Ltd EuroProt DRFP User s guide 5 Parameters from device set 1 of 8 IMPEDANCE CHARACTERISTICS PARAMETERS HONE 1
39. splayed yes 2 4 2 6 Event recording The event recorder function records the following events with time stamp See details of event recording in the EPCP 2004 documentation The integrated LCD of the device can display the following messages U lt started U gt started U lt tripped U gt tripped Definite trip Compiled by Approved by Date Page Kornel Petri Dr Laszlo Balogh 11 09 2004 22 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd The Protect for Windows software displays the digital events in a separate window See details in chapter Digital events 2 4 2 7 Evaluated events The Protect for Windows software displays the evaluated event in a separate window See details in chapter Evaluated events 2 4 2 8 Event counters The counters related to the function are U lt expired cnt U gt expired cnt 2 4 2 9 Signals recorded in the disturbance recorder The integrated disturbance recorder records the following signals Analogue signals U 5 Measured voltage related to the Vn VT Digital signals Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 23 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd 2 5 Automatic reclosing 2 5 1 Main characteristics of the function The automatic reclosing function performs two stage rec
40. ted value can be reset to zero in the Controls window of the Protect for Window operating program 2 7 11 Frequency measurement This function performs Fourier filtering and measures the frequency of the voltage input 2 7 12 Displayed values Summary The algorithms as applied in the protection functions as by products measure and calculate several quantities These values can be displayed on the LCD of the device they are listed on the PC screen when using the Protect for Windows software they are sent to the supervisory and control system and as an option 1f the device contains a graphic display they are shown here as well The measured values as default Active power with current input CT Z lt seeming power with current input CT Z lt Frequency measured on voltage input Countdown to trip of the IDMT function I2t kA2s lFt KA s integrated current square during trip command where I the square of the fault current in kA t the time span starting with the trip impulse and ending with the interruption of the fault current The accumulated value can be reset to zero in the Control window of the Protect for Window operating program Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 37 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 7 13 Self check function The correct operation of the p
41. the operation 2 2 2 4 Displayed information Displayed information on the integrated LCD of the device in the Test menu Measured analogous signals LCD information Countdown starting at 1000 if the function operates Digital information LCD information 2 status bits General start signal General trip command 2 225 Messages of the function The messages related to the function are IDMT tripped Definite trip Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 15 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd To disable these messages a binary parameter must be set es SE mess When set to the messages will not be displayed yes 2 2 2 6 Event recording The event recorder function records the following event with time stamp See details of event recording in the EPCP 2004 documentation The integrated LCD of the device can display the following message 2 2 2 1 Evaluated events The Protect for Windows software displays the evaluated event in a separate window See details in chapter Evaluated events 2 2 2 8 Event counters The IDMT protection function involves the following counters displayed on the integrated LCD of the device IDMT expired cnt Trip command cnt The counter values are displayed in the On line PC screen as well 2 2 2 9 PROTLOG equation i
42. tus of the miniature circuit breaker in the voltage transformer circuit Thermal protection warning signal IDMT function trip command Thermal protection trip command U lt started U gt started Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 34 48 P ROTEC A EuroProt DRFP User s guide Electronics Co Ltd General start of protection functions Protection trip General trip command of protection functions General trip command General close command Definitive trip Definitive trip command The disturbance recorder function operates with factory settings For the user the only possibility for interaction 1s to write logic equation for the triggering with the Protect for Windows program see EPCP 2004 2 7 7 The free programmable timers The program of the device provides three free programmable timers The time delay of these timers can be set with parameters the starting condition can be programmed with PROTLOG equations With parameter setting the timers can operate as operating timer or as resetting timer The timers send signals to the dedicated inputs of PROTLOG equations The function needs setting of the following parameters Step Explanation t l user timer 20 60000 10 Timer with 10 ms accuracy ms t 2 user timer 20 60000 10 Timer with 10 ms accuracy ms S l user timer Timer operating mode m
43. ures of DRFP EP complex protection are as follows The complex device implements the following functions distance protection with 5 zones overcurrent time protection gt gt IDMT thermal protection over undervoltage protection automatic reclosing Features of the protection functions all functions can be individually switched to be operative or inoperative the setting values and time delay of the functions can be set independently of each other Additional features fault location PROTLOG equations event recorder disturbance recorder self monitoring circuit breaker trip and close coil supervision voltage transformer circuit supervision metering An integrated real time clock is implemented with battery supported RAM The clock can be synchronised by external PC or by the supervisory and control system and additionally a Word Time Synchroniser GPS OP produced by PROTECTA Co Ltd can be ordered optionally Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 3 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 1 2 Main hardware features The DRFP EP complex digital protection 1s a full numerical system based on powerful microcontrollers Within the limits of the hardware the functions are determined by the software The design and the man machine interface of th
44. ust be acknowledged by pressing the ENT ENTER pushbutton The effect is that the message disappears When more than one messages are active the first acknowledgement displays the next message After the last active message the normal display function will be active again and the red LED announcing the active messages disappears The active messages are not displayed in the correct event sequence but according to the list above The messages of the protection functions and the self check error messages are logged in the event recorder with time stamp The log can store up to 50 events with scanned analogue values The time resolution is ms In the digital event sequence recorder up to 300 digital events can be recorded These recorded events are stored after acknowledgement as well The event log can be displayed on the man machine interface of the device on the PC screen via serial line using the Protect for Windows software and the events are sent to the supervisory and control system too Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 36 48 PROTEC A EuroProt DRFP User s guide Electronics Co Ltd 2 7 10 Pt measurement This function integrates the current square during trip command IL dt where I2 the square of the fault current in kA t the time span starting with the trip impulse and ending with the interruption of the fault current The accumula
45. xpired cnt Trip command cnt The counter values are displayed in the On line PC screen as well Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 12 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 1 2 9 PROTLOG equation input variables The status signals of the distance protection function are input variables of the PROTLOG equations 2 1 2 10 Signals recorded in the disturbance recorder The integrated disturbance recorder records the following signals Analogue signals I 2 Measured current in the CT Z lt input related to the In CT U Measured voltage related to the Vn VT Digital signals Z5t expired Distance protection reverse zone trip command General start Protection trip General trip command Compiled by Approved by Date Page Korn l Petri Dr L szl Balogh 11 09 2004 13 48 PROTEC A EuroProt DRFP User s guide E lectronics Co Ltd 2 2 Overcurrent time protection IDMT This function 1s an overcurrent protection with current dependent characteristics 2 2 1 The characteristics The algorithm determines the base harmonic of the current using Fourier method then the current dependent characteristic 1s applied The timing 1s limited by a minimum operating time This protection function uses the standard current dependent characteristics Norma
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