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1. 2 4 10 Displayed messages If any of the protection function operates or if the self check function detected any error of the operation then the LCD of the front panel displays a message The table below lists the possible messages LCD messageC Explanation EEPROM emo Internal DC supplyerror ALL TRIPS ARE l l BLOCKED No output is enabled no trip command or signal is possible DSP processor error gt gt 2 t tripped High set overcurrent protection Overcurrent protection side 2 gt 2 t tripped generated trip command gt 2 t tripped Overcurrent protection side 2 generated trip command gt 3 t tripped Overcurrent protection side 3 generated trip command 3lo gt gt t tripped High set zero sequence overcurrent protection generated trip command 3lo gt t tripped Low set zero sequence overcurrent protection generated trip command the first message is valid for transformers with two voltage levels the second one for three voltage levels Fig 31 The possible messages LCD The messages are not displayed in the real event sequence but they are arranged according to the list of the table above The messages and the error signals of the self check function are logged in the event log as well which can store up to 50 events In the digital event sequence the events are logged with ms time resolution here 300 events can be stored The events are not deleted by the acknowle2. by clicking with the mouse on the appropriate element The matrix can be programmed with the man machine interface of the device as well In this case to the input signals matrix rows the binary sum of the code values of the outputs must be assigned see details in the document FuroProt manual Lc NM 99 aimi ae Fig 12 matrix of a device designed for transformers with two voltage levels Protect for Windows Compiled by Approved by Date 23 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electroni USER S MANUAL lectronics Co Ltd ox P IRIP KS K6 H8 K9 K1 Ki1 K12 K13 K14 K15 Ki6 MSG Id gt pal I 15 I 1T I gt i 2 I 72 53 53 t glass SIn t Slo Slo t Inputilt Input2 t Input3 t I Input4 t InputS t nput t I Input tt Self test r sci rt oy cT xEqui xEquz xEqu3 xEgud Fig 13 matrix of a device designed for transformers with three voltage levels Protect for Windows The binary code values of the matrix columns outputs are listed in Fig 14 Kenny Th KS outputrelay 2 a Ko ouput relay 25 4h Fig 14 The binary code values of the matrix columns LCD Compiled by Approved by Date 24 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PR
3. DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL r Ir Rphasecurentl side side Fig 23 Recorded analogue signals DTD 3V3 xx and DTD3 5 3CT V3 xx version Compiled by Approved by Date 31 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL The digital status signals recorded in the disturbance recorder Recorded signal Explanation High set phase overcurrent protection function start side 2 phase R High set phase overcurrent protection function start side 2 phase S High set phase overcurrent protection function start side 2 phase T Phase overcurrent protection function start side 2 phase R Phase overcurrent protection function start side 2 phase S Phase overcurrent protection function start side 2 phase T Fig 24 Recorded status signals DTD 2 V3 xx and DTDZ 2 U dist rec V3 xx version Recorded signal Explanation Phase overcurrent protection function start side 2 phase R I228 Phase overcurrent protection function start side 2 phase S EZT Phase overcurrent protection function start side 2 phase T I gt 3R Phase overcurrent protection function start side 3 phase R Phase overcurrent protection function start side 3 phase S gt 3T Phase overcurrent protection function start side 3 phase T 3lo gt gt Zero sequence high set overcurre
4. The assigned meaning of the seven LED s 1s as follows LED text Explanation LCD Warning LED if the LCD contains a new message or operator intervention is needed e g acknowledgement of parameter Trip command of the differential protection function in phase R Trip command of the differential protection function in phase S Fig 26 LED signals on the front side DTD 2 V3 xx and DTDZ 2 Udist rec V3 xx version LED text Explanation LCD Warning LED if the LCD contains a new message or operator intervention is needed e g acknowledgement of parameter changes Trip command of the differential protection function in phase R Id gt S Trip command of the differential protection function in phase S pS Trip command of the differential protection function in phase T Phase overcurrent protection function start side gt 2 Phase overcurrent protection function start side 2 Phase overcurrent protection function start side 3 Fig 27 LED signals on the front side DTD 3 V3 xx and DTD3 5 3CT V3 xx version The LED s can be programmed for latching see subsequent chapter In this cane they keep the signal until acknowledgement Acknowledgement can be generated with the SW push Compiled by Approved by Date 33 047 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL button or using Input7 or Input8 digital inputs ac
5. Vd1uo6 49 Yd y6 i Dy y i4 DdBy 26 Y yAdi 38 didi 56 Y d di 62 l Duy7v11 15 DdGyii 127 ad5 39 didS 51 d d5 63 Dy 7d i Ddbde 28 y a 40 did 52 d d 64 Dy d6 li DdBd6 29 vesBdii 41 didii 53 Y d dii 65 ll Il l l l Dyliyt 18 EID DIOMEEKIMEI MITTAT 42 d5y6 54 IlydiiyH 66 DyiigS li Dd6y5 31 Y y6y6 43 Wd5u6 55 Ilydiiy6 67 Dyiiy 280 Dd6y 32 Y y6di 44 d5di 56 Y diidi 68 Dyiiyii 21 Dd6yii 33 y6d5 45 d5d5 57 diidS 69 Dyiid amp 22 Dd6d6 34 y6a 46 d5a7 58 diid 78 Dyiid 23 Dd6d6 35 y6dii 47 d5dii 59 diidii 7i Fig 3 Parameters of the differential protection for transformers with three voltage levels Protect for Windows Compiled by Approved by Date 15 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 PROTEC fA lectronics Co Ltd Iset3 _ IdEna t yes tO fl 96 9 Only for transformers with three voltage levels Setting range 0 71 for transformers with three voltage levels Fig 4 Parameters of the differential protection for transformers LCD To enable or disable the differential protection function a special parameter is assigned On the PC Id Id gt gt stages enabled disabled on the LCD IdEna 2 1 3 Outputs of the differential protection function The assignment of the 16 K1 K16
6. gt 2 t counter 0 2 4 12 The self check functions I gt 1 t counter gt 2 t counter 0 gt 3 t counter 0 The correct operation of the program system is supervised by the Watch dog circuit Additionally there are continuous and cyclic self check functions programmed in the factory configuration The self check function detects internal errors of the hardware system Compiled by Approved by Date 40 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 2 4 12 1 Internal supervision The internal supervision covers the following items Hrror free state of the memory for parameter storage Power supply of the battery supported RAM for event recording Correct operation of the A D converter In case of any detected errors the status is changing in the CHK input of the software matrix Optionally this variable integrates the error signals of the circuit breaker supervision system as well This status signal can be marshalled to the available output contacts by programming the software matrix 2 4 12 2 The circuit breaker supervision system option If the device is extended by a CB circuit supervision module it can continuously monitor the healthy state of the CB ON and OFF circuits The method of supervision and its usage 1s described in the document EuroProt manual The CB circuit supervision module includes three opti
7. output relays of the device is made using the software matrix see below in the Chapter The digital software matrix In the versions DTD 3 V3 xx and DTD 3 5 3AV V3 xx additional 8 K17 K24 output relays can be programmed using the PROTLOG equations see below in the Chapter Programming the PROTLOG equations The row of the differential protection function as the software matrix input IS On the PC screen Id On the LCD Mx Id For the PROTLOG programing the input variable received from the differential protection function 1s Id with latching Id gt The latching of the function can be programmed on the LCD with the following parameter MxSId On the PC the latching is set as the following Figure shows m Parameters Fig 5 Programming for latching Compiled by Approved by Date 16 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 2 Phase overcurrent function In the DTD EP factory configuration the differential protection function is extended with phase overcurrent functions as well In the devices designed for transformers with two voltage levels DTD 2 V3 xx DTDZ 2 U dist rec V3 xx the factory configurations realise one stage overcurrent function for the high voltage side and two stage definite time overcurrent protection function on the lover voltage side In the devices designed for trans
8. 25 H 4 30 150 55 Rum 1 e f o o NEU m 1 O 64000 10 p 30 f 150 545 bat m ped elal o oo d o p n 30 150 55 PxEse Mp2 m 0 6400 10 Fig MEM of the overcurrent protection function for transformers with two voltage levels LCD Cr A 50 500 25 He A 0 30 150 55 Pim TT 1 m 0 f 6400 10 P2Ena yes 022 m 0 ew 10 B gt e 0 0 30 150 5 5 PsEwsmy TT TT t3 m 0 6400 10 Fig 9 ie of the T protection function for transformers with three voltage levels LCD Compiled by Approved by Date 18 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd The enabling of the overcurrent protection functions 1s programmed with parameter setting on the LCD of the device the parameters I 1Ena I gt 2Ena I 3Ena and 2 gt gt Ena are to be changed to 1 yes On the external PC the Protect for Windows software shows disabled or enabled The setting of the parameters does not need any explanations 2 2 3 Outputs of the overcurrent functions The programming of the 16 output relays K1 K16 of the DTD EP factory configuration is performed with software matrix see below in Chapter The digital software matrix The versions DTD3V31 and DTDS5 contain additional 8 K17 K24 output relay which can be
9. IiT IZT IdT uw qo 4 E 3 calculated Counters IdtR amp T gt trip counters Ii t trip counters I2 gt gt t trip counters I2 t trip counters Fig 32 The full On line window for transformers with two voltage levels Compiled by Approved by Date 37 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 PROTECTA current A A A measured calculated a Im eztraint currents z Isf Counters I ESPERE trip counters Ii t trip counters I2 gt gt t trip counters I2 t trip counters Fig 33 The full On line window for transformers with three voltage levels Compiled by Approved by Date 38 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD EP DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 2 4 11 2 Information displayed on the LCD In the Test menu of the LCD sequencially the following information can be displayed DE C L BM E e ifferentralcurent in phase T Isr Restraint current in phase R S ir O Ds Primary current RMS value side 2 phaseS Dt Primarycurent RMS value side 2 pase T __ Fig 34 On line information of the LCD of the device for transformers with two voltage levels The explanation of the status information see last two items 1n Figure above can be found in the document EPU 2002 The displayed items are listed
10. LE ou protection protection Table 3 Phase shift code values for a transformer with three voltage levels Compiled by Approved by Date 11 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electroni USER S MANUAL lectronics Co Ltd The differential protection function detects internal fault based on sampled phase current comparison received from all sides of the transformer Rectified average values are calculated for a half period of the network frequency and then the evaluation 1s performed in all sampling time steps in each millisecond If significant difference is detected in 15 consecutive steps this means internal fault and trip command is generated In sampled current comparison the regulating range of the transformer and the errors of the current transformers must be considered as well This is solved by a percentage restraint characteristic If the point in the co ordinate system defined by the 4970 differential current and the Is restraint current is located in the upper part of the figure below the protection operates and after 15 consecutive steps with the same decision it generates a trip command Diff current Ig Uo 300 f ee ett is 100 PEDE hd d RF T UL odi d e NO OPERATION 50 20 Restraint 0 Is 70 current 0 100 200 300 400 500 600 Fig 1 Differential protection tripping characteristics
11. The Is Restraint current and the I4 difference current is explained with the following formulas Compiled by Approved by Date 12 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd The Is Restraint current in transformers with two voltage levels is calculated by 5 100 2 CTI CL2 Isetl Iset2 100 100 100 Ji Isettingl 1 Isetting2 1 The I4 differential current is in transformers with two voltage levels I I I I 100 _100 1 1_ 2 _ 10m 1 __ 1 00 Isettingl Isetting2 Isetl Iset2 The Is Restraint current in transformers with three voltage levels is calculated by I 5 100 b 100 gt _100 CTI CT2 C73 L L L Isetl Iset2 Iset3 setti Isetting2 setting 1 setting setting setting 100 10094 2 2 The Ig 9o differential current is in transformers with three voltage levels I I I I I I 100 _100 gt _100 I 96 2 _ 3 _ 100 eg CPS 1009 Isettingl Isetting2 Isetting3 Isetl Iset2 Iset3 Compiled by Approved by Date 13 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd The individual sections of the tripping characte
12. below The LCD of the EuroProt device displays the status information at the end of the Test menu As an example the first status word DTD EP 1 status 1101110 In this window the figures show that the binary values are refreshing Character means activ state of the status signal means inactive state The numbering of the individual codes is right to left 8 7 6 5 4 3 2 1 11011101 Compiled by Approved by Date 39 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION ROTECTA P lectronics Co Ltd USER S MANUAL The meaning of the status values is configured in the program of the device They are listed in the table below 1 No meaning for the user phase R phase S phase T 5 Nomegingfortheuer o O O 0 0 o 6 No meaning for the user Nomeaningfortheuser O Z o o Nomeaingfortheuser 0 O Nomeaningfortheuser O o Nomeaningfortheuser O O 0 0 o Nomeaningfortheuser O o 0 Nomeaningfortheuser O 0 0 o Nomeaningfortheuser 0 o 7 8 H BATT LOW SYSTEM error BATTERY 8 ae iA Further in the Test menu there are counter values The four counters are listed in the tables For transformers with three voltage levels Id trip counter 0 0 below For transformers with two voltage levels Id trip counter 0 0 I gt 1 t counter gt gt 2 t counter 0
13. idis Isetting 2 Iset1 gt S 10095 Iset2 3 100 8 100 CT2 and U Isetting Isetting3 100 Iset3 100 CT3 Where U1 U2 and U are the rated voltage values of the transformer in case of regulating coils these are the central values The setting defined value is free to choose It is usual to be selected as the rated current of the transformer on the primary side Z settingl ltrnl This setting1 will be the reference value for displaying the d differential current and for the s 9o restraint current when it 1s considered on the secondary side it 1s setting2 etc Matching the phase shift of the transformer The matching of the phase shift of the transformer 1s solved by a simple parameter setting which is the code value of the transformer s connection group e g Yd11 In a differential protection for a transformer with two voltage levels the code values are listed 1n Table 2 parameter Setting code 0 11 and that for a transformer with three voltage levels in Table 3 parameter Setting code 0 71 Compiled by Approved by Date 9 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 PROTECTA lectronics Co Ltd Setting code Connection Vectors Phase shift group 0 a L ee E TA NEC ZARNI 3 pow que pes Lo ow uj pawesn The meaning of phase shift is U U e The polarity of the current transformers is explained in the fo
14. programmed using the PROTLOG equations see below in chapter Programming the PROTLOG equations In both methods external control functions can be realised as well M trix rows inputs of the matrix related to the overcurrent functions For two voltage levels For three voltage levels Mx PIR Mx PIR Mx I 18 PIS MxFLIS T Mx IT PIT Mx DIT pi Mxrit Pilja Mxblt 2 Mxrl 2 D2 MxL2 2 Mxr 2t P2 MxL2t Mx I22 p3 JMxb3 E Mx I gt 2 t jP3 Mxpb3t O PROTLOG equation input variables related to the overcurrent functions For two voltage levels For three voltage levels External PC External PC 22 The variables are repeated wit which mean latching Compiled by Approved by Date 19 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL The latching of the status signals for can be programmed using an external PC as it is indicated in Fig 10 ELIT MM 2 2 Fig 10 Latching the status signals of the overcurrent function two voltage levels Protect for Windows x Fig 11 Latching the status signals of the overcurrent function three voltage levels Protect for Windows On the LCD the same parameters are indicated with MxS prefix Compile
15. supported by the arrows push buttons J and T The displayed measured and calculated values the counters and status signals in the Test menu is described in details in the Chapter Information displayed on the LCD 3 1 3 The Chk menu In this menu the parameter setting can be checked without need of password input New setting in this menu is not possible for setting enter Param parameter setting menu 3 1 4 The Version menu In this menu the device type the version of the configuration and the time of programming can be seen DTD 2 DTD 2 U dist rec 2003 12 05 V3 01 2004 03 16 V3 01 DTD 3 DTD 3 5 3 CT 2003 12 05 V3 01 2003 09 19 V3 00 The upper row shows the type of the factory configuration the lower one displays the date of the version and the version identifier 3 1 5 The Param menu The Param parameter setting menu supports the parameter setting for the protection and automatics functions the communication and the software matrix The user can enter this menu with password only The detailed description can be found in the document EuroProt manual The list of the parameters the setting ranges and the setting steps are in the function descriptions above Compiled by Approved by Date 45 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 3 1 6 Parameters related to the communication Th
16. them the first 16 output relay contacts can be programmed with the software matrix see Chapter The digital software matrix In the version for transformers with three voltage levels additional 8 output relay contacts are assigned to the PROTLOG equation outputs see Chapter The PROTLOG equations The integrated disturbance recorder function records the status of the first four output relay contacts only 2 4 5 Circuit breaker control function A dedicated window of the Protect for Windows operating program supports generating manual close or open commands to the circuit breaker but the DTD factory configurations do not support circuit breaker control function 2 4 6 The integrated disturbance recorder function The CPU module includes an integrated disturbance recorder function which records sampled analogue values and digital status signals This function does not have own man machine interface it can communicate with and external PC via fibre optic connection The records can be analysed on the screen of the external PC they can be printed or sent to the central engineering workstation for further evaluation The sampled analogue signals transmitted for recording are Recorded signal Explanation only in DI DZ 2 U dist rec version Fig 22 Recorded analogue signals DTD 2 V3 xx and DTDZ 2 Udist rec V3 xx version Compiled by Approved by Date 30 47 Gyula Poka L szl Eperjesi 05 22 2004 V 3 00
17. unit of the network Compiled by Approved by Date 5 47 Gyula Poka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 1 1 The main characteristics of the complex differential protection The DTD EP complex differential protection is a member of the EuroProt device family of PROTECTA Co Ltd It is a fully numerical type microprocessor based device The main characteristics of the DTD EP complex differential protection are as follows The protection part of the device includes the following functions Three phase differential protection function Compares the sampled momentary values of the currents The tripping characteristic is composed of three line sections which can be set independently The function operates independently in all three phases The restraint function is based on the average of the currents at each voltage levels The function 1s not sensitive on transformer inrush current It does not need additional matching auxiliary current transformers the turns ratio of the transformer and the phase shift due to the connection group of the transformer is matched by the software The faults are indicated in all three phases selectively The operation time is about 20 25 ms If the high current set differential protection stage operates the reaction time 1s about 10 15 ms The three phase overcur
18. 2A NOD 2005 06 16 Version DTD 2 Io 2005 06 13 V3 00 Compiled by Approved by Date 47 4 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00
19. EuroProt devices are described in the document EuroProt manual The device can be operated by the integrated man machine interface 2x16 character LCD an 6 push buttons on the front panel but the operation 1s more convenient using a connected external PC running the Protect for Windows operating program developed by Protecta Co Ltd Both possibilities are described in details in the document EuroProt manual The external communication can be performed via the RS 232 serial interface of the front panel isolated against 2 kV or via fibre optic interface on the rear side of the device The application of these communication interfaces is described in the document EuroProt manual as well Compiled by Approved by Date 7 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 2 Theoperation of the protective functions The DTD EP type complex numerical protection contains the following protection functions Three phase differential protection functions operating independently in all three phases Three phase overcurrent functions Optional zero sequence overcurrent function Processing the mechanical protections of the transformer The protection functions are fully independent from each other and the setting is independent too The outputs are managed by the software matrix each of them can be enabled or disabled individually By appr
20. OTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL The matrix inputs matrix rows which can be assigned to the outputs are listed in Fig 15 Matrix row element Explanation MxI 2tor gt 2t for transformers with three voltage levels See chapter Application of the digital inputs Fig 15 The matrix row elements LCD Compiled by Approved by Date 25 47 Gyula Poka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 2 4 2 Programming PROTLOG equations The available status signals can be used to program logic equations the result of which can be used freely 2 4 2 1 Inputs of the PROTLOG equations The available status signals are listed in Fig 16 and Fig 17 Input identifier ld Tripcommand of the differential protection function Trip command of the overcurrent function on the primary side of the transformer side of the transformer Trip command of the high current setting overcurrent function on the secondary side of the transformer Starting of the overcurrent function on the secondary side of the transformer transformer Stlo gt t Trip command of the low current setting stage of the earth fault protection Starting of the high current setting stage of the earth fault protection Stlo gt gt t Trip command of the high current setting stage of the earth fault protection All the statu
21. PROTLOG equations for transformers with two voltage levels Output name Explanation K17 Fig 19 PROTLOG equations for transformers with three voltage levels 2 4 2 3 Programming the PROTLOG equations The PROTLOG equations can be programmed with external PC only using the Protect for Windows operating program s graphic editor possibility The LCD of the device does not support this programming The method of graphical equation editor 1s described in details in the document EuroProt manual Compiled by Approved by Date 28 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 2 4 3 Application of the digital inputs The factory configuration of the DTD EP device is extended with 8 digital inputs The first seven inputs are connected to digital timers and additionally the first four can be programmed for drop off delay or for starting delay all others are pre programmed for starting delay The first seven status signals serve as inputs for the software matrix and all of them can be applied as input variables of the PROTLOG equations The Protect for Windows operating program running on an external PC supports the programming REE time delayed time delayed time delayed time delayed Fig 20 Parameters of the input timers Protect for Windows The reset time delayed means that the tim
22. cally isolated inputs One of them connects the TRIPI circuit the second the TRIP2 the third the ON circuit Compiled by Approved by Date 41 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD EP DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 3 Communication with the device 3 1 The menu system The menu system of the LCD on the front panel of the device and the method of operation is described in details in the document EuroProt manual this section describes the structure of the menu only When energised the LCD displays the device type and the current date and time month day hour minute second DTD 2 PROTECTA DTD 3 PROTECTA 04 19 13 25 32 04 19 13 25 32 When pressing ENTER the root menu is displayed Events Test Chk Version Param 3 1 1 The Events menu When selecting the Events menu the last evaluated event is displayed on the LCD The push button 4 steps to the previous event the push button T steps back The following table lists the possible events Overcurrent protection start side 3 phase R Overcurrent protection start side 3 phase S Overcurrent protection start side 3 phase T Overcurrent protection trip side 3 Zero sequence high set overcurrent protection start Zero sequence high set overcurrent protection trip Zero sequence overcurrent protection start Zero sequence overcurrent protection trip The short messages in the table ar
23. cording to the enabling with parameter setting see Chapter Application of the digital input 2 4 9 Latching All matrix rows and the LED s can be programmed for latching for latching the character must be changed for by clicking with he mouse Parameters l Latches Idelta Input 1 Ii gt R started Input2 11386 started Input3 IiI started Input4 Ii gt t tripped Inputs I2 gt gt started Input amp I2 gt gt t tripped Input I2 gt started z Self test Iz t tripped LEDs Fig 28 Latching in devices designed for transformers with two voltage levels PC inixi al Latches Idelta Input 1 I1 5HR started Input 2 Ib started 7 Input3 Ii gt I started Input4 Ii t tripped Inputs I2 gt started Input amp I2 gt t tripped Input 13 started z Self test Ig t tripped LEDs Fig 29 Latching in devices designed for transformers with three voltage levels PC Compiled by Approved by Date 34 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL LCD text Explanation 6 input timer timeout 7 input timer timeout for transformers with three voltage levels Fig 30 Latching parameter setting LCD Compiled by Approved by Date 35 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL
24. d by Approved by Date 20 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 2 3 Earth fault protection One of the main functions of the complex motor protection 1s the earth fault protection This function measures the zero sequence current partly as the sum of the three phase current partly the zero sequence current 1s measured on an independent input The earth fault protection 1s a two stage definite time zero sequence overcurrent protection The low current setting stage uses the zero sequence current measured on the dedicated current input the decision of the high current setting stage 1s based on the sum of the three phase currents The operation of the earth fault protection 1s similar to that of the phase overcurrent protection but beside the enabling the operation of the low current setting stage has an additional constraint as well the phase overcurrents protection may not operate at the same time 2 3 1 Realisation of the earth fault protection In the DTD EP factory configuration the zero sequence overcurrent function operates independently of the phase overcurrent protection The algorithm determines the basic harmonic of the zero sequence current both for the current measured on the dedicated input and for the sum of the phase currents and these values are compared with the settings The zero sequence current 3Io is calculated as
25. dgement The event log can be displayed with the LCD of the front panel and the contents of the event log and the content of the event sequence log can be evaluated using the connected PC or by the SCADA system too See detailed description in the document EuroProt manual Compiled by Approved by Date 36 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 2 4 11 The displayed information On line window summary The algorithms applied for protective functions as a by product generate measure or calculate several values These values and information can be displayed on the screen of the PC connected via serial line or on the small LCD or on the optional high resolution graphic display of the device Additionally they are available on the optionally connected SCADA system as well 2 4 11 1 Information displayed on an external PC The measured values phase currents and calculated values difference of the currents restraint currents the status information of the protective functions starting trip signals status of the digital inputs and output relays accumulated counter values and additional service information can be displayed in the On line window of the connected PC see the following figure and details in the document FuroProt manual d On line information CUrrents A 118 A 128 Differencial current dR d
26. e displayed with the exact time of the event The following table lists the possible events Compiled by Approved by Date 42 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL KI KI output contact operated K2 K2 outtputcontactoperated K3 O o KA O Kl K2 K3 K4 K7 output contact operated Fig 35 Possible events as displayed in the Events menu of the LCD for transformers with two voltage levels Compiled by Approved by Date 43 47 High set differential protection trip command phase S Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL Overcurrent protection start side 2 phase S KI ORK output contact operated me K2 K2 outputcontactoperated e Lo K3 0 KA Kl K2 K3 K4 K7 output contact operated Fig 36 Possible events as displayed in the Events menu of the LCD for transformers with three voltage levels Compiled by Approved by Date 44 47 High set differential protection trip command phase S Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 3 1 2 The Test menu In this menu first the measured values are displayed in primary Amperes The navigation 1s
27. e parameter setting of the communication function is unified for all EuroProt devices This is described in the document EuroProt manual 3 1 7 Password The password protection is unified for all EuroProt devices This is described in the document EuroProt manual 3 2 Connecting the device to an external PC The handling of the device is more convenient and quicker than the operation with the local man machine interface 1f the device 1s connected to an external PC The operating software is the Protect for Windows program This program and the files related to the factory configuration bla gra or blk grf and additionally the dok file is delivered with the device and it is stored in the program memory of the CPU as well Details of the operation of this program pleas find in the document EuroProt manual 4 The optional local SCADA functions In the CPU module of the device a dedicated micro controller is assigned to perform local SCADA functions This is supported by the large high resolution graphic LCD which 1s an option of the device The usage of the SCAD function is unified for all EuroProt devices This is described 1n the document EuroProt manual 5 Arrangement of the DID EP factory configuration The layout of the device is described in the document EuroProt manual The arrangement of the front panel the module configuration the Protect for Windows files bla gra or blk grf and add
28. er delays the drop off of the status signal This can be changed to oper time delayed which means that the status is set with time delay The LCD of the device displays these parameters as follows they can be found in menu I QqINI ms 0 6400 310 UNI S D sat 1 0f QqIN2 ms 0 f 64000 10 N2 S D sat 1f 0f t IN3 ms 0 64000 10 N3 S D sat 1f 0f Q INA ms 0 f 64000 10 N4 S D sat 1f 0f QqINS ms 0 f 64000 10 LING ms 0 f 64000 10 RINT ms O 64000 10 Fig 21 Parameters of the input timers LCD The latching programmed in the device can be acknowledged and reset by pressing the SW push button on the front panel of the device Input8 or Input7 optically isolated digital inputs can be used for acknowledgement The selection 1s with parameter setting On the PC Acknowledgement SW2 or Input8 Toggle SW2 or Input LCD n IN7 Ackn The integrated disturbance recorder function records the status of the first four inputs only Compiled by Approved by Date 29 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 2 4 4 Application of the relay outputs The program of the DTD 2 hardware configuration supports 16 output relays the program of the configuration for transformers with three voltage levels uses 24 output relay contacts Out of
29. formers with three voltage levels DTD 3 V3 xx DTD 3 5 3CT V3 xx the factory configurations realise one stage overcurrent function for the high voltage side and for both medium voltage sides as well 2 2 1 Realisation of the phase overcurrent function The algorithm calculates with numerical Fourier analysis the basic harmonic component of the current and this is compared with the setting value If the basic harmonic component is above the setting the function starts the time counter the expiry of which generates a trip command The measurement and the comparison are performed independently in all three phases the timer however is common for the three phases and the trip command is common too 2 2 2 Parameter setting The phase overcurrent function needs the following parameter setting as it is shown on Fig 6 and 7 The Figures are PC screen snap shots from the Protect for Windows operating software HETE al blocked blocked blocked Fig 6 Parameters of the overcurrent protection function for transformers with two voltage levels Protect for Windows Compiled by Approved by Date 17 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL Ii xj a enabled enabled Fig 7 Parameters of the overcurrent protection function for transformers with three voltage levels Protect for Windows CTi A 55000
30. ics of a specific application the factory configuration DTD EP complex differential protection The general description of the members of the EuroProt type complex protection family can be found in document EuroProt complex protection hardware and software description and user s manual further EuroProt manual The DTD EP complex numerical device realises three phase differential protection function which can be applied to high speed and selective protection of high voltage transformers generators and generator transformer units This manual describes several versions The main information concerning these versions are summarised in the Table below DTD 2 05 12 2003 V3 01 For transformers with two voltage levels DTDZ 2 16 03 2004 V3 01 For transformers with two voltage levels U dist rec additional voltage inputs for disturbance recording DTD 3 05 12 2003x V3 01 For transformers with three voltage levels with connections to 5 CT s zero sequence OC extension Table 1 The most common DTD versions The device does not require matching intermediate current transformers The turns ratio and the phase shift due to the connection group of the transformers are matched by the software of the differential protection The device includes separate overcurrent protection functions for all voltage levels of the transformer As an option the included control SCADA functions can extend the device to the complex field
31. itionally dok and the connection arrangement depend on the configuration These files and additional documents are attached to the device 6 Size The sizes of the different configurations are given in the document EuroProt manual The related information is attached to the device Compiled by Approved by Date 46 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 7 Ordering information Ordering of the device 1s helped by filling the ordering sheet which is the attachment of the ordering This includes the following information e Type of the device configuration DTD EP EuroProt multifunctional device version DTD2V31 DTD2V3IU DTD3V31 or DTDS factory configuration Rated power supply voltage e Rated input voltage 100 V 200 V e Rated current 1 A 5 A e Special requirement for contact rated current 2 A 4 A Design of the device 19 cabinet mounted relay panel mounted or flush mounted Options SCADA functions etc 8 Information Data of the described versions DTD2V31 NOD file DTD2V31 NOD 2004 03 18 Version DTD 2 2003 12 05 V3 01 DTD2V31U NOD file TD2V31U NOD 2004 03 18 Version DTD 2 U dist rec 2004 03 16 V3 01 DTD3V31 NOD file DTD3V31 NOD 2004 03 18 Version DTD 3 2003 12 05 V3 01 DTDS NOD file DTD5 NOD 2004 03 18 Version DTD 3 5 3 AV 2003 09 19 V3 00 DTD2 Io NOD file DTD2V3
32. llowing Figure CTI CT2 to the protection Side 1 Side 2 Connection As the Figure indicates the connections of the CT marked with same letters are located near to the transformer Table 2 Phase shift code values for a transformer with two voltage levels Compiled by Approved by Date 10 47 Gyula Poka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL Connection group Yy0y0 Yy0y6 Yy0d1 Yy0d5 Yy0d7 Yy0d11 Yy6y0 Yy6y6 Yy6d1 Yy6d5 Yy6d7 Yy6d11 Ydly0 Ydly6 Ydldl Yd1d5 Yd1d7 Ydid11 Yd5y0 Yd5y6 Yd5d1 Yd5d5 Yd5d7 Yd5d11 Yd7y0 Yd7y6 Yd7dl Yd7d5 Yd7d7 Yd7d11 Yd11y0 Yd11y6 Yd11d1 Yd11d5 Yd11d7 Yd11d11 Connection group Dylyl Dyly5 Dyly7 Dy1y11 Dy1d0 Dy1d6 Dy5yl Dy5y5 Dy5y7 DySyll Dy5d0 Dy5d6 Dy7yl Dy7y5 Dy7y7 Dy7y11 Dy7d0 Dy7d6 Dyllyl Dylly5 Dylly7 Dyllyl1 Dy11d0 Dy11d6 Dd0y1 Dd0y5 Dd0y7 Dd0y11 Dd0d0 Dd0d6 Dd6y1 Dd6y5 Dd6y7 Dd6y11 Dd6d0 Dd6d6 setting code setting code W Go 00 A A A WN Un Un A J J Un o ho Qu A A nn SVE HR n nN nN w w w w Go Go N pe ffm nnn peek eek peek un oc N Un VININININ GINISA amp N N W bo ho N Un N e J ja J E e N E S N Un The polarity of the current transformers 1s explained in the following Figure CT2 CTI L K protection CT3 3
33. nt protection function start Zero sequence low set overcurrent protection function start Fig 25 Recorded digital status signals DTD 3 V3 xx and DTD3 5 3CT V3 xx version The integrated disturbance recorder function has factory setting There is only one possibility for the user to influence the operation of the recorder using the Protect for Windows program logic equations can be edited to trigger the recording see Chapter PROTLOG equations and the document KeuroProt manual Compiled by Approved by Date 32 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd As an option an additional disturbance recorder module can be ordered in the device For this module the triggering can be configured using the external PC the timer settings can be changed pre fault time etc the name of the individual channels can be edited etc The record of this disturbance recorder module can be accessed analysed or printed using the external PC 2 4 7 The free programmable timers There are no free programmable timers in the DTD EP factory configurations If it is needed the timers dedicated to external input signals can be used see Chapter Application of the digital inputs 2 4 8 The LED indication If any of the protection functions generate a trip command the seven LED signals on the front panel enable quick information about the events
34. opriate parameter setting they can be programmed for latching The following chapters contain the description of the protection functions 2 1 Differential protection functions The basic function of the complex device is the three phase differential protection 2 1 1 Realisation of the differential protection functions The precondition of the correct operation of the DTD EP type differential protection function is the correct matching of the currents and the correct handling of the different transformer connection groups Current matching When setting the parameters of the device the primary rated currents of the main transformers on all two or three sides of the transformer must be selected AV1 AV2 and AV3 in primary Amperes These parameters are needed only to display the measured currents scaled in primary values The matching of the currents in DTD EP differential protection function is easy An appropriate setting value is to be defined which must be calculated as transformed to all voltage levels and are to be expressed as percent of the rated currents of the main current transformers Iset Iset2 and Iset3 This calculation assures the matching of the normal operating currents The calculation 1s based on the following formulas Compiled by Approved by Date 8 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd E Isettingl
35. otection status signals tele protection Communication with the processor driven high resolution graphic LCD e Transmission of the messages of the protection function to the SCADA system e Command inputs from the SCADA system and command processing e Command inputs from the local LCD and command processing gt Continuous and periodic self supervision functions There are 16 output relays driven by a software matrix The event log of the device can store up to 50 events the event sequence recorder is g p q prepared for 300 digital events wit 1 ms time resolution gt The real time clock of the device is supported by a battery supplied RAM The clock can be synchronised either by an external PC or by the SCADA system and a special device made by the Protecta Co Ltd for synchronisation Word Time Synchroniser GPS OP is available as well gt The integrated disturbance recorder of the CPU module can store up to 11 records the total recording time is about 10 s gt The device can realise several measuring functions based on the available analogue signals 1 2 The main features of the hardware The DTD EP complex digital differential protection device is a fully numerical micro controller based system The functions are determined by the software within the limitations of the hardware The device performs the protection and the SCADA functions of high voltage transformers The design and the operation of the
36. p petri doku europrot pokagy dtdio dtd i0 doc PROTECTA Electronics Co Ltd EuroProt complex protection DIDD ABP Three phase differential protection Factory configuration User s manual Versions DTD 2 V3 xx DTDZ 2 U dist rec V3 xx DTD 3 V3 xx DTD 3 5 3CT V3 xx DTD 2 Io V3 xx Document ID EX 13 15059 12 Budapest May 2005 ssze ll totta P ka Gyula DTD EP DTD EP DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL Version history of the User s manual 16 03 2004 Application of the unified notation of the devices 01 05 2005 17 05 2005 Earth fault protection function added Compiled by Approved by Date 2 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 PROTEC fA lectronics Co Ltd Compiled by Approved by Date 3 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 PROTEC fA lectronics Co Ltd Compiled by Approved by Date 4 47 Gyula Poka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd Field of application The EuroProt type complex protection in respect of hardware and software is a modular device The modules are assembled and configured according to the requirements then the functions are determined within the hardware limitations by the software This document describes the individual characterist
37. rent function is provided for all voltage levels e Incase of two voltage levels The high voltage side is protected by a single stage overcurrent function On the lower voltage side it 1s a two stage function e Incase of three voltage levels On all three sides it is a single stage function Optional earth fault overcurrent function The low voltage side is protected by a two stage zero sequent overcurrent function The current settings and the time delay can be set individually for all sides The device is prepared to input the operating status signals of the mechanical protection functions of the transformer The setting of all functions is independent of each other The main characteristics of the optional SCADA functions in the device can be as follows a The SCADA functions are performed by a dedicated controller of the CPU module or optionally a separate SCADA module can be involved The optional high resolution graphic LCD can realise comprehensive local control and supervisory functions Compiled by Approved by Date 6 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL The realised SCADA functions can be as follows e Control functions of the field With local or remote operation Interlocking functions Generation of detailed status signals Event recording function Remote transmission of pr
38. ristics are explained as follows This 1s the setting value of the horizontal section of the tripping characteristic which defines the basic sensitivity of the differential function The value is expressed as percent of the set current setting value The differential protection can operate if 470 gt f1 299 This 1s the slope setting of the second section of the differential characteristic This slope is needed mainly because of the voltage regulation range of the transformer The differential function 1s balanced in the medium position of the tap changer any other position generates a differential current The second section of the characteristic starts 1n the origin and the section above the first section is valid only The differential protection operates if the Ia 9o differential current is above the percent value defined by the 590 current and the f2 slope setting The differential protection can operate if 490 gt f2 100 Is The third section of the characteristic 1s needed because the possible saturation of the main current transformers The slope of this section is constant tgoc 2 The starting point of this section on the vertical axis of the co ordinate system 1s a negative value defined by f3 it 15 valid only above the second section of the characteristic The differential protection can operate if the differential current is above this line too Iy gt 2 Ig 1390 To prevent false tripping because of the high inru
39. rotection parameters PFansformer 1 side current setpoint Iseti1 28 270 23 Fansformer 2 side current setpoint lset2 286 270 23 Id gt Id gt gt stages enabled Id gt gt stage setpoint 860 2560 7560 part tId gt fixlset gt 11 26 50 25 part tId gt f2Is gt ES 26 50 25 part tId gt ls 2 f3Iset gt 31 266 2600 710b Il _ harmonic blocking f2heIldtId2h gt f2h 18 36 725 ector group parameter H4 ii 7 1353 ector gr pari i 3 l6 17 8 il I G ze a G rm ector group Dd YyB8 Dy di Dy5 Yd5 Dd6 y6 Do7 Vd7 Dyii dii Fig 2 Parameters of the differential protection for transformers with two voltage levels Protect for Windows HET T Differential protection parameters Pansformer 1 side current setpoint seti C2H 27H 25 Pansformer 2 side current setpoint lIlsetz C2H 2 7H ra ranzformer 3 side current setpoint Iset3il C2H 278H 723 Id gt Id gt gt stages blocked Id gt gt stage setpoint C8HH 25600 58 part Id fixlset gt 11 28 50 2 part db LIE 21 caBg b5H 2 part MP EL e aa Eaa f3 c28 2BHBBH 71 gt II harmonic blocking f2h IdtId2h gt 2h 1H8 3H 725 group parameter CH 71 zi gt ector Cod Nector Cod lector Cod lector Cod Mector Cod le amp ector Cod group Il group l group l group l group ll group Dy yi 12 DdGyi 24 Y y ye 36 diya 48 d y6 6H Dy yS i3 DdByS 25 yAy6 37
40. s signals are repeated with This means latching Fig 16 The PROTLOG inputs for transformers with two voltage levels Compiled by Approved by Date 26 47 Gyula Poka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL PUE tia Trip command of the overcurrent function on the primary side of the transformer Starting of the overcurrent function on the secondary side of the transformer transformer KENNEN Starting of the overcurrent function on the tertiary side of the transformer P3 t Trip command of the overcurrent function on the tertiary side of the transformer Stlo gt t Trip command of the low current setting stage of the earth fault protection Starting of the high current setting stage of the earth fault protection Stlo gt gt t Trip command of the high current setting stage of the earth fault protection All the status signals are repeated with This means latching The optically isolated inputs can be used to process the status signals of the mechanical transformer protections Fig 17 The PROTLOG inputs for transformers with three voltage levels Compiled by Approved by Date 27 4 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD EP DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 2 4 2 2 Outputs of the PROTLOG equations Output name Explanation Fig 18
41. sh current of the transformer the differential protection 1s provided wit a second harmonic restraint The second harmonic restraint prevents the operation of the differential protection 1f the second harmonic content of the differential current is above the f2h setting which is expressed as 96 This means Id2h gt f2h Id2h is the percentage value of the second harmonic content in differential current related to the basic harmonic There is a possibility to set a high current value of the differential current above which the function generates an immediate trip command without restraint calculation The setting value is referred to the setting1 value and it is expressed in 9o If this stage operates the differential protection function generates a trip command within 15 20 ms If the differential current 1s above the characteristic lines the normal operating time of the differential protection function is about 20 25 ms if the high current setting stage operates the time delay is about 10 15 ms Compiled by Approved by Date 14 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 PROTECTA lectronics Co Ltd 2 1 2 The parameter setting The differential protection function according to the explanation above needs setting the following parameters as it is shown in Fig 2 Fig 2 is the snapshot of the Parameters Window of the Protect for Windows software m Parameters Differential p
42. the sum of the phase currents and it is measured on the independent zero sequence current input as well Ir Is It 3Io 2 3 2 Parameters of the function The function needs setting for the following parameters CTPrN CTdevN Primary rated current of the current transformers needed for displaying the measured current only 3Io gt In CtoProt Current setting of the low current stage related to the zero sequence CT rated current in t 31Io ms 64000 10 Delay time of the low current setting stage independent of the current value 310 enable Enabling of the zero sequence overcurrent Ces R tei function low current setting stage enabled Compiled by Approved by Date 21 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DTD P DIFFERENTIAL PROTECTION PROTECTION PROTECTA Electronics Co Ltd USER S MANUAL 3Io gt gt In CT2 30 1500 5 Current setting of the high current stage related to the phase CT s rated current in percent D I p nig afte cament value o independent of the current value 3Io gt gt enable Enabling of the zero sequence overcurrent ena function high current setting stage enabled The settings related to the earth fault protection on the connected PC screen Parameters of other functions are masked Parameters blocked blocked Fig 2 7 Parameter setting 2 2 3 3 Digital outputs of the function The zero sequence overcurrent functions pro
43. vide inputs for the PROTLOG equations The outputs of the PROTLOG equations can be directed to relay outputs using the software matrix PROTLOG Explanation input a StIo gt Starting of the low current setting stage of the earth fault protection if it is enabled latching is possible StIo gt t Trip command of the low current setting stage of the earth fault protection if it is enabled latching is possible Stlo gt gt Starting of the high current setting stage of the earth fault protection if it 1s enabled latching is possible StIo gt gt t Trip command of the high current setting stage of the earth fault protection if it is enabled latching is possible Compiled by Approved by Date 22 47 Gyula P ka L szl Eperjesi 05 22 2004 V 3 00 DTD EP DIFFERENTIAL PROTECTION PROTECTA E USER S MANUAL lectronics Co Ltd 2 4 Additional functions 2 4 1 The digital software matrix Using the software matrix the status signals of the individual protection functions or internal status signals of the self check function can be marshalled to output relays The inputs of the matrix are the status signals the outputs are the relay contacts The most convenient way to program the matrix 1s the application of the Protect for Windows software running on an external PC The logic connection between the OR connection of the inputs and outputs is established by changing the appropriate matrix element from to
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