Technical Guide and user manual
Contents
1. RE DM 28 GEORG RET MUN MONS db lb HII A AWL a L1 T 1 IIIILP I 111111 T 011111 T SQNO23S 3WIL MULTIPLES OF PICK UP SETTING 0 5 TMS RTMS 0 2 D TMS RTMS A TMS RTMS 0 025 E TMS RTMS B TMS RTMS 1 25 1 65 Technical Data Page 24 25 DOA 2 1 Gu 5 lt a ui 2 2 gt TM c m CH i M AN N N SQNO23S 3WI1 MULTIPLES OF PICK UP SETTING 0 5 C TMS RTMS 0 2 D TMS RTMS 0 025 E TMS RTMS TMS RTMS 1 25 B TMS RTMS 1 66 Technical Data Page 25 25 DOA 2 1 T 2 lt x gt 2 gt SQNOO3S MULTIPLES OF PICK UP SETTING 0 5 TMS RTMS 0 2 D TMS RTMS TMS RTMS 0 025 1 E TMS RTMS2. The RI curve has the following definition 1 0 236 0 339 setting is from 0 10 to 10 in steps of 0 05 The equation is valid for 1 1 lt 1 15 lt 20 t K 9 1 2 Reset Timer The first stage thresholds for phase and earth overcurrent protection are provided with a timer hold facility t Reset It may be set to a definite time value or to an inverse definite minimum time characteristic IEEE ANSI curves only This may be useful in certain applications for example when grading with upstream electromechanical overcurrent relays that have inherent reset time delays A possible situation where the reset timer may be used is to reduce fault clearance times where intermittent faults occur An example may occur in a cable with plastic insulation In this application it is possible that the fault energy melts the cable insulation which then reseals after clearance thereby eliminating the cause for the fault This process repeats itself 53 Technical Data Page 12 25 DOA 2 1 to give a succession of fault current pulses each of increasing duration with reducing intervals between the pulses until the fault becomes permanent By using the reset timer hold function the relay will integrate the fault current pulses thereby reducing fault clearance time The mathematical formula applicable to the five curves is t Reset time K Factor see table Value of the measured current Is Value o
3. IEEE MI VI IEEE RI RECT curve tle gt gt Os 300s 0 01 le gt gt TMS 0 025 1 5 0 025 le gt gt gt 0 5 In 40 In 0 01 In tle gt gt gt Os 300s 0 01 7 RECORDING FUNCTIONS 7 1 Event Records Capacity Time tag Triggers Any selected protection alarm and logic input change of state Setting changes Self test events 50 Page 8 25 DOA 2 1 Technical Data Page 9 25 DOA 2 1 7 2 Fault Records Capacity 5 faults Time tag 1 millisecond Triggers Any selected protection alarm and threshold Data Fault date Protection thresholds Setting Group AC inputs measurements RMS Fault measurements 7 3 Instantaneous recorder Capacity 5 starting information s instantaneous Time tag 1 millisecond Triggers Any selected protection alarm and threshold Data date hour origin any protection alarm length duration of the instantaneous trip yes or no 8 COMMUNICATION Type Port Relay Physical Connectors Data Rate Protocol Position Link RS485 Rear port Screened Screws 300 to 38400 band ModBus twister Pair snap on programmable Courier IEC60870 5 103 DNP3 0 RS232 Rear port Screened Sub D 9 connector 300 to 38400 band twister Pair pin female programmable ModBus RTU 51 Technical Data Page 10 25 DOA 2 1 9 CURVES 9 1 General Although the curve
4. 1A lt 0 010 VA 5A Thermal withstand 1s 100 x rated current 2s 40 x rated current continuous 4 x rated current 44 Technical Data Page 3 25 DOA 2 1 1 4 Logic Inputs Logic input type Independent optically insulated Logic input burden lt 10 m Amps per input Logic input recognition time lt 10ms 1 4 1 Supply The logic inputs shall be powered with a DC or AC voltage 48 200 Vdc or 35 150 Vac 1 5 Output Relay Characteristic Contact rating Contact relay Dry contact Ag CdO Make current Max 30A and carry for 3s Carry capacity 5A continuous Rated Voltage 250Vac Breaking characteristic Breaking capacity AC 1250 VA resistive 1250 VA inductive P F 0 5 220 Vac 5A cos o 0 6 Breaking capacity DC 135 Vdc 0 3A L R 30 ms 250 Vdc 50W resistive or 25W inductive L R 40ms Operation time lt 7ms Durability Loaded contact 10000 operation minimum Unloaded contact 100000 operation minimum 45 Technical Data 2 INSULATION Dielectric withstand Impulse voltage Insulation resistance 3 EMC TESTS High freguency disturbance Fast transient Electrostatic Discharge immunity radiated IEC 60 255 5 IEC 60 255 5 IEC 60 255 5 IEC 61000 4 1 IEC 61000 4 4 ANSI C37 90 1 IEC 61000 4 2 ANSI C37 90 2 IEC 61000 4 3 46 Page 4 25 DOA 2 1 2 KV common mode 1 KV di
5. CONTENT 1 o o RATINGS 1 1 Power Supply 1 2 Freguency 1 3 Current Inputs 1 4 Logic Inputs 1 4 1 Supply 1 5 Output Relay Characteristic INSULATION EMC TESTS ENVIRONMENT Deviation of Protection Elements PROTECTION SETTING RANGES 6 1 50 51 Phase Overcurrent 6 1 1 Protection Setting Ranges RECORDING FUNCTIONS 7 1 Event Records 7 2 Fault Records 7 3 Instantaneous recorder COMMUNICATION 42 Page 1 25 DOA 2 1 o o o o O FR o N N N Technical Data DOA 2 1 9 CURVES 10 9 1 General 10 9 1 1 Inverse Time Curves 10 9 1 2 Reset Timer 11 9 2 IEC Curves 13 9 3 RI Curves 19 9 4 IEEE ANS amp Curves 20 43 Technical Data 1 RATINGS 1 1 Power Supply Page 2 25 DOA 2 1 Nominal auxiliary voltage Vx 48 200VDC 130 250VDC 100 250VAC Operating range AC DC 20 of Vx Residual ripple Up to 12 Stored energy time 250 ms for interruption of Vx Burden Stand by lt 2W DC or lt 4VA AC Max lt 5W DC or lt 10VA AC 1 2 Frequency Frequency protection functions From 45 to 65Hz Nominal frequency 50 60Hz 1 3 Current Inputs Phase current inputs 1 and 5A by connection Earth current inputs 1 and 5A by connection Operating range Selection by ordering code Burden Phase Current lt 0 025 VA 1A lt 0 3 VA 5A Burden Earth Current lt 0 008 VA
6. 0 025 D TMS 0 2 1 5 0 5 B TMS 1 A TMS 1 25 57 Technical Data Page 16 25 DOA 2 1 u w m c ui gt lt gt SQNO23S NI MULTIPLES OF PICK UP SETTING A TMS 1 25 1 TMS 0 5 TMS 0 2 D TMS 0 025 TMS 58 Technical Data Page 17 25 DOA 2 1 100 Ri i 6 L LB 10 MULTIPLES OF PICK UP SETTING m es i EL 1 l g n oc u gt 2 Ll BE 5 T 5 oc k SGNOD3S NI 3WIL A TMS 1 25 1 B TMS 0 5 C TMS 0 2 D TMS 0 025 E TMS 59 Technical Data Page 18 25 DOA 2 1 14 gt 2 0 l TH QU NI SGNOO3S NI bri MULTIPLES OF 1 UP SETTING TMS 1 25 1 TMS 0 5 D TMS 0 2 0 025 60 Technical Data Page 19 25 DOA 2 1 9 3 RI Curves gt 4 2 9 2 SE E To m s T ns n rJ SQNO23S NI 3WIL MULTIPLES OF PICK UP SETTING 61 Page 20 2
7. B TMS RTMS 1 25 67 Aplication Guide DOA 2 1 APLICATION GUIDE Aplication Guide Page 1 16 DOA 2 1 CONTENTS 1 INTRODUCTION 2 1 1 Protection of Underground and Overhead Lines 2 1 2 SAM DOA 2 1 Overcurrent Relay 3 2 EARTH AND PHASE CURRENT OVERCURRENT FUNCTIONS 6 2 1 Instantaneous function 50 50N 8 2 2 DMT thresholds 8 2 3 IDMT thresholds 8 2 3 1 Inverse time curves 8 2 4 Reset timer 9 2 5 Time graded protection 10 3 TRANSFORMER INRUSH CURRENTS 10 4 BLOCKING LOGIC FUNCTION 10 5 SETTING GROUP SELECTION 12 6 Scheme of operation 14 7 Scheme of operation for general connection of relay 15 69 Aplication Guide Page 2 16 DOA 2 1 1 INTRODUCTION 1 1 Protection of Underground and Overhead Lines The secure and reliable transmission and distribution of power within a network is heavily dependent upon the integrity of underground cables and overhead lines which link the various sections of the network together Therefore the associated protection system must also provide both secure and reliable operation The most common fault conditions on underground cables and overhead lines are short circuit faults These faults may occur between the phase conductors but will most often involve one or more phase conductor becoming short circuited to earth Faults caused by short circuits reguire the fastest faulted conductor clearance times but at the same time allowing for suitable co ordination with other downstream
8. RELAY TRIP 1st stage earth fault threshold 2nd stage earth fault threshold 3rd stage earth fault threshold 1st stage PHASE overcurrent threshold 2nd stage PHASE overcurrent threshold 3rd stage PHASE overcurrent threshold 1st stage earth fault time out 2nd stage earth fault time out 3rd stage earth fault time out 1st stage PHASE overcurrent time out 2nd stage PHASE overcurrent time out 3rd stage PHASE overcurrent time out At least one output relay is latched The relay trip is latched 26 User Guide Page 10 13 DOA 2 1 4 2 Relay Hardware or Software Warning Messages Any software or hardware fault internal to DOA2 1 relay generates a hardware software alarm that is stored in memory as a Hardware Alarm If several hardware alarms are detected they are all stored in their order of appearance The warning messages are resented on the LCD in reverse order of their detection the most recent first and the oldest last Each warning message is numbered and the total stored is shown The user can read all warning messages pressing without entering the password It is not possible to acknowledge and clear warning messages caused by internal relay hardware or software failure This message can only be cleared once the cause of the hardware or software failure has been removed The control of the WARNING LED LED 3 is directly assigned to the status of the warning messages stored in the memory If the internal hardware or software
9. applies to installation which is being carried out at the same time as construction work Handling Installation and Case Dimensions Page 6 8 DOA 2 1 5 STORAGE If relay is not to be installed immediately upon receipt they should be stored in a place free from dust and moisture in their original cartons Where de humidifier bags have been included in the packing they should be retained The action of the de humidifier crystals will be impaired if the bag has been exposed to ambient conditions and may be restored by gently heating the bag for about an hour prior to replacing it in the carton Dust which collects on a carton may on subseguent unpacking find its way into the relay in damp conditions the carton and packing may become impregnated with moisture and the de humidifier will lose its efficiency Storage temperature 25 to 70 Handling Installation and Case Dimensions Page 7 8 DOA 2 1 6 CASE DIMENSIONS The relay is available in a 4U metal case for panel or flush mounting Weight 1 8 Kg External size Height case 152 mm front panel 177 mm Width case 97 mm front panel 103 mm Depth case 226 mm front panel case 252 mm dimensions in mm Handling Installation and Case Dimensions Page 8 8 DOA 2 1 7 Communication 7 1 RS232 Port In the bottom of the front panel there is a RS232 port The communication with a computer through the RS232 allows access to the relay all information and s
10. between the groups can be done via the relay front panel interface CONFIGURATION GROUP SELECT ACTIVE GROUP 1 or 2 a dedicated logic input AUTOMAT CTRL INPUT X CHANGE SET where X is the chosen logic input To avoid any false trip the change of setting group is only carried out when no protection function is running If a setting group change is received during any protection or automation function it is stored and executed after the last timer has elapsed The user can check which one of the active group is active looking under the OP PARAMETERS menu The user can also assign the active group to an output relay Using a normally open contact this means that an open contact will indicate that the active group is Group 1 a close contact will indicate that the active group is Group 2 Change of setting group done by a digital input It is possible to change the setting group via the activation of a digital input on level The user can select an activation of the input on low level or high level going under the CONFIGURATION Group Select Active Group The active group is the group selected when in put is not activated and vise versa Warning if the digital input that has been assigned to the change of setting group it is not possible to change the setting group via remote communication or front panel 80 Aplication Guide Page 13 16 DOA 2 1 SWITCH BETWEEN ACTIVE GROUPS When powering on the relay the
11. by default going under the CONFIGURATION Display menu 5 2 Access to the menu Navigation through the different menus is done pressing the arrow keys 4v gt lt The organisation of the menus is shown in figure as follows There is need of an unlock key when reading parameters and measured values Modification of a parameter reguires entering a password Should an error be made in entering a parameter press O to cancel NOTE The letter P is displayed when the password needs to be entered If no key is pushed during 5 minutes the password needs to be entered again 5 3 Menu contents description The menu of DOA 2 1 relay is divided into 8 main sections OP PARAMETERS CONFIGURATION MEASUREMENTS COMMUNICATION PROTECTION G 1 PROTECTION G2 AUTOMAT CTRL RECORDS VV Y To access these menus from the default display press y 29 User Guide DEFAULT DISPLAY 1 1245 Page 13 13 DOA 2 1 OP PARAMETERS 00 o 9 9 09 PROTECTION G1 PROTECTION GI 5 9 9 RECORDS 30 Menu Content Tables DOA 2 1 MENU CONTENT TABLES And description of details are as follow Page 1 9 Menu Content Tables DOA 2 1 0 00A 0 00A 0 00A 0 00A EME COMMUNICATION CONFIGURATION Communication Yes Frequency 50 01 Hz aq a Group Select LED 4 5 6 7 6 8 255 50 A IL2 Stop
12. insulated ring washer or by using a tin terminals 16 User Guide DOA 2 1 User Guide User Guide Page 1 13 DOA 2 1 CONTENTS 1 PRESENTATION OF DOA 2 1 RELAY 2 2 USER INTERFACE 3 2 1 LCD display and keypad description 4 2 1 1 LCD display 4 2 1 2 Keypad 4 2 2 LEDs 5 2 3 Description of the two areas under the top and bottom flaps 6 3 PASSWORD 7 3 1 Password protection 7 3 1 1 Password entry 7 3 1 2 Changing the password 7 3 1 3 Change of setting invalidation 8 4 DISPLAYS OF ALARM amp WARNING MESSAGES 8 4 1 Electrical Network Alarms 8 4 2 Relay Hardware or Software Warning Messages 10 5 MENUS 12 5 1 Default display 12 5 2 Access to the menu 12 5 3 Menu contents description 12 User Guide Page 2 13 DOA 2 1 1 PRESENTATION OF DOA 2 1 RELAY This relay is fully numerical relays designed to perform electrical protection and control functions DOA 2 1 relay is a self power relay also could powered either from a DC or an AC auxiliary power supply Using the front panel the user can easily navigate through the menu and access data change settings read measurements etc Eleven LEDs situated in the front panel help the user to guickly Know the status of the relay and the presence of alarms Alarms that have been detected are stored and can be displayed on the back lit LCD Any short time voltage interruption lt 50ms is filtered and regulated through the auxiliary power supply DOA 2 1 relay have 3 phase and 1
13. keys gt lt 4 located in the middle of the front panel They are used to navigate through the different menus and submenus and to do the setting of the relay The enter key is used to validate a choice or a value modification of settings 21 User Guide Page 5 13 DOA 2 1 2 2 LEDs The top three LEDs indicate the status of the relay Trip condition alarm LED eguipment failure The five lower LEDs are freely programmable by the user and can be assigned to display a threshold crossing for example available for all models or to show the status of the logic inputs The description of each one of these eight LEDs located in the left side of the front view is given hereafter numbered from the top to bottom from 1 to 3 3 LEDs at bottom showed by G1 G2 auxiliary supply LED 1 Colour RED Label Trip LED 1 indicates that the relay has issued a trip order to the cut off element circuit breaker contactor This LED recopies the trip order issued to the Trip logic output As soon as a triggering order is issued the LED lights up It is cleared when the associated alarm is acknowledged either through the front panel or by a remote command a digital input or by a new fault configuration Alarms menu LED 2 Colour yellow Label ALARM LED 2 indicates that the relay has detected an alarm This alarm can either be a threshold crossing instantaneous or a trip order time delayed As soon as an alarm is detected the LED
14. long as the Log signal is active As soon as the blocking Log signal disappears if the overcurrent value is still over the set threshold the time delay resumes its countdown considering the value prior to the activation of the blocking function as its new initial value This allows a faster clearance of the fault after a reset of the Log signal 75 Aplication Guide Page 16 DOA 2 1 2 1 Instantaneous function 50 50N As soon as a phase or earth threshold is running the instantaneous output associated with this threshold is activated This output indicates that the protection element has detected a phase or earth fault and that the time delay associated with the threshold has started This time delay can be blocked via the logic input Log associated with this threshold If this blocking input is activated by an output contact of a downstream relay the logic that will lead to the trip command is then blocked only if the relay that is the closest to the fault can see and therefore eliminate the fault This principle is known as Blocking logic or Blocking It is described in more detail in this document 2 2 DMT thresholds The three phase earth overcurrent thresholds can be selected with a time constant delay The time to operate is egual to the time delay set plus the time for the output contact to operate typically about 20 to 30 ms 20ms for a current exceeding or equal to 2 times t
15. wide choice of characteristics of triggering times makes it possible to easily integrate an existing protection scheme 72 Aplication Guide Page 5 16 DOA 2 1 The protection and features of this overcurrent relay Oe Restricted Earth faut nstantaneousistartcontact atoning output contacts CS oser 9 Fault Record Event Record RS 485 rear communication Modbus RTU IEC 60870 5 103 Courier DNP3 0 73 Aplication Guide Page 6 16 DOA 2 1 2 EARTH AND PHASE CURRENT OVERCURRENT FUNCTIONS SAM DOA 2 1 of relay provide definite and independent time delay overcurrent protection Each phase current and earth current input has three thresholds The first and second thresholds can be set as definite delay time or inverse delay time using the IEC IEEE ANSI and curves Their parameters are shown in the Technical Data chapter of this Technical Guide The third threshold can be set as definite delay time only In a similar way the earth fault elements has three different thresholds that besides can be set independently of the settings chosen for the phases The instantaneous thresholds are represented by the symbol I gt for the first threshold gt gt and gt gt gt for the second and third instantaneous thresholds gt gt gt and gt gt gt for earth thresholds Th
16. 5 Technical Data DOA 2 1 9 4 IEEE ANSI amp CO Curves verse Moderately In Very Inverse 0 025 TMS RTMS 9 2 0 U oj S 2 lt MULTIPLES PICK UP SETTING Short Time Inverse CO2 Long Time Inverse CO8 Extremely Inverse SQNO23S NI 3WI1 62 Technical Data Page 21 25 DOA 2 1 zov 222221 p R ___ g gt oz L o SQNO23S 3WIL MULTIPLES OF PICK UP SETTING 1 25 TMS RTMS 1 TMS RTMS 0 5 0 2 TMS RTMS D TMS RTMS 0 025 TMS RTMS 63 Technical Data Page 22 25 DOA 2 1 a 2 5 o 2 gt lt 22 bM M p LL CALE TWNNN NWN TD 111 RR E THE METEL RH 50 0235 MULTIPLES OF PICK UP SETTING 0 5 TMS RTMS 0 2 D TMS RTMS TMS RTMS 0 025 E TMS RTMS 1225 TMS RTMS 1 64 Technical Data Page 23 25 DOA 2 1 o 0 gt 2 gt F 2 0 HI
17. 5 buttons to modify the setting and read vaues Battrey RS 232 FIGURE 1 DOA 2 1 front panel The front panel of the relay has three separate sections 1 The LCD display and the keypad 2 The LEDs 3 The two zones under the upper and lower flaps 20 User Guide Page 4 13 DOA 2 1 2 1 LCD display and keypad description 2 1 1 LCD display In the front panel a liguid crystal display LCD displays settings measured values and alarms Data is accessed through a menu structure The LCD has two lines with sixteen characters each A back light is activated when a key is pressed and will remain lit for five minutes after the last key press This allows the user to be able to read the display in most lighting conditions 2 1 2 Keypad The keypad has seven keys divided into two groups Two keys located just under the screen keys and keys and are used to read and acknowledge alarms To display successive alarms press key amp Alarms are displayed in reverse order of their detection the most recent alarm first the oldest alarm last To acknowledge the alarms the user can either acknowledge each alarm using or go to the end of the ALARM menu and acknowledge all the alarms at the same time When navigating through submenus key O is also used to come back to the head line of the corresponding menu NOTE To acknowledge a relay latched refer to the corresponding submenu section Four main arrow
18. AEG 3AM ENGINEERING Numerical overcurrent time and over load protection DOA 2 1 Technical Guide and user manual Technical Guide and user manual Contents DOA 2 1 NUMERICAL OVERCURRENT RELAYS CONTENTS Introduction Handling Installation and Case Dimensions User Guide Menu Content Tables Technical Data and Curve Characteristics Application Guide Introduction Page 1 5 DOA 2 1 CONTENTS 1 INTRODUCTION 2 HOW TO USE THIS MANUAL 3 INTRODUCTION TO THE DOA 2 1 4 MAIN FUNCTIONS a N Introduction Page 2 5 DOA 2 1 1 INTRODUCTION The overcurrent relay type DOA 2 1 is a numerical relay have been designed to control protect and monitor industrial installations public distribution networks and substations and to be used as back up protection for EHV and HV transmission networks Introduction Page 3 5 DOA 2 1 2 HOW TO USE THIS MANUAL This manual provides a description of DOA 2 1 functions and settings The goal of this manual is to allow the user to become familiar with the application installation setting and commissioning of these relays This manual has the following format DOA 2 1 Introduction Contents of the manual and general introduction to the relay DOA 2 1 Handling installation and case dimensions Precautions to be taken when handling electronic eguipment DOA 2 1 User Guide of the relay as A detailed description of the features DOA 2 1 Technical data and curv
19. S 6 1 50 51 Phase and Earth Overcurrent DOA 2 1 6 1 1 Protection Setting Ranges Setting Range 50 51 Phase OC Min Max Step gt 0 1 In 25 0 01 In Delay type DT or IDMT STI IEC SI IEC EI IEC LTI C02 C08 IEEE MI VI IEEE EI RECT curve tl 0s 300 s 0 01 I gt TMS 0 025 1 5 0 025 Reset Delay Type DT or IDMT I gt RTMS 0 025 3 2 0 025 tReset 40 ms 100s 0 01 gt gt 0 5 In 40 In 0 01 In Delay type DT or IDMT IEC_STI IEC SI VI IEC C02 C08 IEEE MI VI IEEE EI RECT curve gt gt Os 300 s 0 01 gt gt 0 025 1 5 0 025 gt gt gt 0 5 In 40 In 0 01 In gt gt gt 05 300 5 0 01 5 7 25 DOA 2 1 The dynamic range of measurement is typically 400 time of the minimum setting 49 Technical Data Setting Range 50N 51N Earth OC Min Max Step le gt 0 1 In 25 In 0 01 In Delay type DT or IDMT STI IEC SI VI IEC IEC LTI CO2 CO8 IEEE MI IIEEE VI IEEE RI RECT curve Os 300s 0 01 le gt TMS 0 025 1 5 0 025 le gt Reset Delay Type DT or IDMT le gt RTMS 0 025 3 2 0 025 le gt tReset 40 ms 100 0 01 s le gt gt 0 5 In 40 In 0 01 In Delay type DT or IDMT IEC STI IEC SI VI IEC IEC LTI C02 C08
20. ation which may be used for making measurements should be earthed to the case whenever possible More information on safe working procedures for all electronic eguipment can be found in BS5783 and 147 It is strongly recommended that detailed investigations on electronic circuitry or modification work should be carried out in a special handling area such as described in the above mentioned BS and IEC documents Handling Installation and Case Dimensions Page 4 8 DOA 2 1 3 RELAY MOUNTING The relay is dispatched either individually or as part of a panel rack assembly If a test block is to be included it should be positioned at the right hand side of the assembly viewed from the front Modules should remain protected by their metal case during assembly into a panel or rack For individually mounted relays an outline diagram is supplied in following of this chapter showing the panel cut outs and hole centres Handling Installation and Case Dimensions Page 5 8 DOA 2 1 4 UNPACKING Care must be taken when unpacking and installing the relay so that none of the parts is damaged or the settings altered The relay must only be handled by skilled personnel The installation should be clean dry and reasonably free from dust and excessive vibration The site should be well lit to facilitate inspection The relay that have been removed from the case should not be left in a situation where that is exposed to dust or damp This particularly
21. bits j w7 IL3 CT primary 1000 12 20 00 A un nn Relay Address 1 CT sec 32 Menu Content Tables Page 2 9 DOA 2 1 33 Menu Content Tables Page 3 9 DOA 2 1 34 Menu Content Tables Page 4 9 DOA 2 1 32 Menu Content Tables Page 5 9 DOA 2 1 40ms tReset IEC IEEE RC 36 Menu Content Tables Page 6 9 DOA 2 1 je 7 Yes 37 Menu Content Tables Page 7 9 DOA 2 1 002 002 0 004 0 004 Blocking Logic Trip Commands y Latch Functions z o o CNT le Yes Yes Latch t gt gt Yes Latch 11 gt gt gt Yes Latch tle gt Yes a gt 0 1 in Latch tle gt gt Tp 8 gt gt Tms Yes Laich gt gt gt Yes 0 025 np De gt gt gt Yes Yes 60 ms Deisy Type OMT 38 Menu Content Tables Page 8 9 DOA 2 1 39 Menu Content Tables Instantaneous Fault Time 206 23 42 Fault Date Active Group 2 Faulted Phase EARTH Threshold lez Magnitude Magnitude 3 Magnitude 500 Magnitude 1200 480 VWagnibude 1D3 A 40 Diisturb Record Post Time Disturb Rec Trig OM INST Page 9 9 DOA 2 1 Technical Data DOA 2 1 TECHNICAL DATA AND CHARACTERISTIC CURVES Technical Data
22. d with any subseguent parameter modification 3 1 2 Changing the password To change an active password go to the OP PARAMETERS menu and then to the Password submenu Enter the current password and validate it Then press enter keypad and enter the new password character by character and validate the new password using enter keypad The message NEW PASSWORD OK is displayed to indicate that the new password has been accepted 24 User Guide Page 8 13 DOA 2 1 3 1 3 Change of setting invalidation The procedure to modify a setting is described in the following sections of this manual If there is a need to get back to the old setting push key O before validating the setting change The following message will then appear on the LCD for a few seconds and the old setting will remain unchanged UPGRADE CANCEL 4 DISPLAYS OF ALARM amp WARNING MESSAGES Alarm messages are displayed directly on the front panel LCD They have priority over the default display presenting measured current values As soon as the relay detects an alarm condition crossing of a threshold for example the associated message is displayed on the front panel LCD and the LED Alarm LED 2 lights up We distinguish two types of alarm and warning messages Alarm messages generated by the electrical power network Warning messages caused by hardware or software faults from the relay 4 1 Electrical Network Alarms Any crossing of a threshold instantaneous or time dela
23. de Page 7 13 DOA 2 1 3 PASSWORD 3 1 Password protection An unlock key up down is required when you want to press any key after 5 minutes that you don t press any key you must unlock the keys for navigation through menus A password is required for relay settings especially when changing the various thresholds time delays communication parameters allocation of inputs and outputs relays The password consists of four capital characters When leaving factory the password is set to AAAA The user can define his own combination of four characters Should the password be lost or forgotten the modification of the stored parameters is blocked It is then necessary to contact the manufacturer or his representative and a standby password specific to the relay may be obtained The programming mode is indicated with the letter P on the right hand side of the display on each menu heading The letter remains present as long as the password is active 5 minutes if there is no action on the keypad 3 1 1 Password entry The input of the password is reguested as soon as a modification of a parameter is made for any one of the six eight menus and the submenus The user enters each one of the 4 characters and then validates the entire password with enter keypad After 5 seconds the display returns to the point of the preceding menu If no key is pressed inside of 5 minutes the password is deactivated A new password request is associate
24. e characteristics Comprehensive details on nominal values setting ranges specifications and curves characteristics DOA 2 1 Commissioning and Maintenance Guide Guide to commissioning problem solving and maintenance of DOA 2 1 DOA 2 1 Connection diagrams for the relay DOA 2 1 Comnmissioning test records DOA 2 1 Hardware Software version history DOA 2 1 Communication mapping data bases Introduction Page 4 5 DOA 2 1 3 INTRODUCTION TO THE DOA 2 1 RELAY The DOA 2 1 relay provide comprehensive overcurrent phase and earth fault protection for utilities networks industrial plants and networks as well as for other applications where overcurrent protection is reguired The earth fault protection is sensitive enough to be applied in electrical networks where the earth fault current is low In addition to its protective functions each relay offers control and recording features They can be fully integrated to a control system so protection control data acguisition and recording of faults events and disturbances can be made available The relay is eguipped on the front panel with a liguid crystal display LCD with 2 x 16 back lit alphanumerical characters a tactile 7 button keypad to access all settings clear alarms and read measurements and 11 LEDs that indicate the status of the relay In addition the use of the RS485 communication port makes it possible to read reinitialize and change the settings of the relay if reguired fro
25. e time delayed thresholds are represented by the symbol tl gt for the first threshold tl gt gt and gt gt gt for the second and third time delay thresholds gt gt gt and tle gt gt gt for the time delay earth fault thresholds The protection elements trip when the following conditions are realized The phase current exceeds the set overcurrent threshold The time delay has elapsed The blocking logic if used is not activated 74 Aplication Guide Page 7 16 DOA 2 1 The following diagrams show the functionality for each threshold gt Inst gt aH omor Block tl gt gt Inst l gt gt Trip l gt gt Inst l gt gt gt Trip gt gt gt Block tl gt gt gt Blocking logic LOGIC OF PHASE THRESHOLDS AND gt gt gt With Max I gt OR IB gt OR IC gt gt gt OR IB gt gt OR IC gt gt gt gt gt gt gt gt OR IB gt gt gt OR IC gt gt gt The logic associated to the earth fault threshold is identical to the one described above The different thresholds l gt amp tl gt l gt gt amp tl gt gt and l gt gt gt amp tl gt gt gt are respectively replaced by thresholds le gt amp tle gt le gt gt amp tle gt gt and le gt gt gt amp te gt gt gt Thanks to the Blocking Logic function it is possible to freeze the timer as
26. earth current inputs available for 1 and 5 Amps rated CTs On each one of these relay it is possible to combine 1 and 5 Amp current inputs together a mix between 1A for earth fault and 5A for phase connections DOA 2 1 relay continuously measure phase and earth currents and take into account the true RMS current value up to 10th harmonic at 50 Hz Output relays are freely configurable and can be activated by any of the control or protection functions available in the relay Logic inputs can also be assigned to various control functions On their rear terminals DOA 2 1 have a standard RS485 port available When ordering the user can choose between the following communication protocol ModBus RTU IEC 60870 5 103 Courier or DNP3 0 Using RS485 communication channel all stored information measurements alarms and parameters can be read and settings can be modified when the chosen protocol allows it DOA 2 1 relay can be connected directly to a digital control system All the available data can then be gathered by a substation control system and be processed either locally or remotely User Guide Page 3 13 DOA 2 1 2 USER INTERFACE DOA 2 1 relay from panel allows the user to easily enter relay settings display measured values and alarm and to clearly display the status of the relay 2x 16 alphanumerical backlit display 2 buttons to read and clear alarms messages Trip led Alarm led Warning led Programmable leds NX
27. educed The electronic circuits are completely safe from electrostatic discharge when housed in the case Do not expose them to risk of damage by withdrawing modules unnecessarily Each module incorporates the highest practicable protection for its semiconductor devices However if it becomes necessary to withdraw a module the following precautions should be taken to preserve the high reliability and long life for which the eguipment has been designed and manufactured 1 Before removing a module ensure that you are at the same electrostatic potential as the eguipment by touching the case 2 Handle the module by its front plate frame or edges of the printed circuit board Avoid touching the electronic components printed circuit track or connectors 3 Do not pass the module to another person without first ensuring you are both at the same electrostatic potential Shaking hands achieves equal potential 4 Place the module on an antistatic surface or on a conducting surface which is at the same potential as yourself 5 Store or transport the module in a conductive bag If you are making measurements on the internal electronic circuitry of an eguipment in service it is preferable that you are earthed to the case with a conductive wrist strap Wrist straps should have a resistance to ground between 500kO 10MO If a wrist strap is not available you should maintain regular contact with the case to prevent a build up of static Instrument
28. elays are time graded in such a way that the relay closer to the fault operates faster than the upstream relays This is referred to as relay coordination because if the relay nearest to the fault does not operate the next relay will trip in a slightly longer time The time grading steps are typically 400 ms the operation times becoming progressively longer with each stage When difficulty is experienced in arranging the reguired time grading steps the use of a blocked overcurrent scheme should be considered described in a later section 3 TRANSFORMER INRUSH CURRENTS Either l gt gt le gt gt or l gt gt gt le gt gt gt elements can be used as high set instantaneous elements The design is such that they do not respond to the DC transient component of the fault current The principle of operation allows the current settings to be set down to 35 of the prospective peak inrush current that will be taken by a transformer when it is energized As a first approximation the peak inrush is given by the reciprocal of the per unit series reactance of the transformer 4 BLOCKING LOGIC FUNCTION BLOCKED OVERCURRENT PROTECTION This type of protection can be applied to radial feeder circuits where there is little or no back feed For parallel feeders ring circuits or where there can be a back feed from generators directional relays should be considered The blocking logic function allows the upstream IDMT relay to be blocked by the start outp
29. etting It makes the access and changes of any information setting and configuration You can see all events and records by this port on monitor of computer we will explain it by details in the next sections 7 2 RS485 port Connections to RS485 is made using annular terminals It is recommended that a two core screened cable is used with a maximum total length of 1000 m or a200nF total cable capacitance Typical specification Each core 16 0 2 mm copper conductor PVC insulated Nominal conductor area 0 5 per core Screen Overall braid PVC sheathed Linear capacitance between conductor and earth 100pF m 8 Earthing Each eguipment must be connected to a local earth terminal by the intermediary of a earth terminals We recommend a wire of minimal section of 2 5 with annular terminals on the side of the eguipment Because of the limitations of the annular terminals the possible maximum section is of 6mm by wire If a larger section is necessary one can use cables connected in parallel each one ending with an annular terminal separated on the side of the eguipment One can also use a metal bar NOTE To prevent any electrolytic risk between copper conductor or brass conductor and the back plate of the eguipment it is necessary to take precautions to isolate them one from the other This can be done in several ways for example by inserting between the conductor and the case a plated nickel or
30. f the programmed threshold pick up value a Factor see table T Reset time multiplier RTMS setting between 0 025 and 1 5 Type of curve Standard K factor a factor Short time inverse C02 2 261 2 Moderately inverse ANSI IEEE 4 850 2 Long time inverse C08 5 950 2 Very inverse ANSI IEEE 21 600 2 Extremely Inverse ANSI IEEE 29 100 2 54 Technical Data Page 13 25 DOA 2 1 The following curves are given for indication only 9 2 IEC Curves TIME IN SECONDS e CURVES TMS 0 025 am man m EH aid Eisai EU ME A i MULTIPLES PICK UP SETTING Short time inverse 2 1 Standard Inverse Very Inverse Extremely Inverse Long Time Inverse 2 1 55 Technical Data TIME IN SECONDS Page 14 25 DOA 2 1 Short Time Inverse 5 V mm m 7 BEI NI MULTIPLES OF PICK UP SETTING TMS 0 025 D TMS 0 2 0 5 TMS 1 A TMS 1 25 56 Technical Data Page 15 25 DOA 2 1 STANDARD INVERSE IEC 22 a o ue z MULTIPLES OF PICK UP SETTING TMS
31. failure is major i e the relay cannot perform protection functions the WARNING LED LED 3 lights up continuously If the internal hardware or software failure is minor like a communication failure that has no influence on the protection and automation functions the WARNING LED LED 3 will flash Possible Hardware or Software alarm messages are Major fault The protection and automation functions are stopped The RLO watchdog relay is de energised 35 36 contact closed lt lt EEPROM ERROR CALIBR gt gt Calibration zone failure lt lt CT ERROR gt gt Analog channel failure Minor fault The DOA 2 1 relay is fully operational The RLO watchdog relay is energised 35 36 contact open 36 37 contact closed lt lt RAM ERROR gt gt RAM supplied by battery failed lt lt Battery fail gt gt battery failure flat or not correctly in place 27 User Guide Page 11 13 DOA 2 1 NOTE The lt lt Battery backed RAM memory gt gt and lt lt Battery failure gt gt alarm messages can be configured to be displayed or not by selecting yes or no in the configuration Alarms menu lt lt DEFAULT SETTINGS gt gt lt lt SETTING ERROR gt gt COMM ERROR Communication failure CLOCK ERROR Time tag failure DEFAULT SETTINGS Each time the relay is powered ON it will check its memory contents to determine whether the settings are set to the factory defaults If the relay detec
32. fferential mode 5 common mode 1 KV differential mode gt 1000 MQ 2 5 KV common mode Class 3 1 KV differential mode Class 3 4 common mode class 4 2 KV others class 4 8 class 4 35 10 V m Technical Data 4 ENVIRONMENT Temperature Humidity dam heat Enclosure protection Sinusoidal Vibrations Shocks Bump Seismic IEC 600 68 2 1 IEC 600 68 2 2 IEC 600 68 2 3 IEC 60 529 IEC 60 255 21 1 IEC 60 255 21 2 IEC 60 255 21 2 IEC 60 255 21 3 47 Page 5 25 DOA 2 1 Storage 25 C to 70 C Operation 25 C to 55 C 56 days at 93 RH and 40 C IP 52 IK 07 Response and endurance class 2 Response and withstand class 1 Response and withstand class 1 Class 1 Technical Data 5 Deviation of Protection Elements Page 6 25 DOA 2 1 Glossary phase 15 gt l gt gt l gt gt gt les le gt le gt gt le gt gt gt Element Range Deviation Trigger Reset Time deviation Phase overcurrent 0 1to 40In 295 Ist 2 0 95 Is 2 2 30 50 ms Elements IDMT 1 1Is 2 1 05 Is 2 5 30 50 ms gt gt gt gt gt gt Earth fault 0 1to40 In 200 lest 2 0 95 Is 2 2 30 50 ms overcurrent IDMT 1 1 les 2 1 05 15 2 5 430 50 ms Elements le gt le gt gt gt gt gt 48 Technical Data 6 PROTECTION SETTING RANGE
33. for General connection of relay We see here one of the most simple of the relay in connection with primary CT s For using of this circuit by using SAM DOA 2 1 relay you con refer to figures of next page The number of the terminals are shown exactly as it is in the rear of the relay for CT s inputs programmable digital inputs relay outputs and communication RS 485 port 83 The current inputs are connected to 3 phase CTs w Phase rotation Tripping output programmeable ALARM programmable output Case earth programmable output Module terminal blocks viewed from rear with integral case earth link Nota Case earth connection 1 V Shorting links make befor b and disconnect b gt Short terminals break before c programable input 485 Port connection gt Long terminals programable input d e Pins terminals Ipcb type 2 Earth terminals are typical only Link terminals 30 and 32 if The relay is connected at the Vx 48 150 35 110 V ac end of the RS485 bus
34. group selected Group 1 or Group 2 corresponds to the state of the logic input This means Active group 1 Group 1 logic Input is not active Group 2 logic Input is active If the programmable logic input is supplied with V then the active group will be G2 If the logic input is not supplied with V then the active group will be G1 B Active group 2 Group 1 logic Input is active Group 2 logic Input is not active If the programmable logic input is energized with V then the active group will be G1 If the programmable logic input is not energized with V then the active group will be G2 Priority When changing parameters through the front panel the priority is given to the user that takes local control of the relay when entering a password Change of setting group done via a remote command is not allowed for as long as the password is active 5minute ORIGIN OF THE ORDER PRIORITY LEVEL FRONT PANEL MAXIMUM LOGIC INPUT MEDIUM REMOTE COMMUNICATIONS MINIMUM Aplication Guide Page 14 16 DOA 2 1 6 Scheme of operation How to use the relay in Circuit For using of the relay we can connect it as blow As you see we can choose one amp current or five amps current depend on the request LIII SAM E La od tywynu This schematic is for test of the relay by current injection 82 Aplication Guide Page 15 16 DOA 2 1 7 Scheme of operation
35. he threshold and the time required to detect the overcurrent state maximum 20ms at 50 2 2 3 IDMT thresholds 2 3 1 Inverse time curves The first and second phases earth overcurrent threshold can be selected with a dependent time characteristic The time delay is calculated with a mathematical formula There are eleven inverse time characteristics available The mathematical formula applicable to the first ten curves is 76 Aplication Guide Page 9 16 DOA 2 1 Where t Tripping time K Coefficient see table Value of measured current 15 Value of the programmed threshold Pick up value a Coefficient see table L ANSI IEEE coefficient zero for IEC curves T Time multiplier between 0 025 and 1 5 2 4 Reset timer The first phase overcurrent threshold I gt tl gt le gt tle gt for the earth has a reset timer The value that is set for this reset timer corresponds to the minimum time during which the current value needs to be lower than 959e of the phase or earth threshold before the corresponding phase or earth time delay is reset NOTE This rule doesn t apply when the protection triggers When the protection triggers the time delay tl gt or tle gt is immediately reset The value of this reset timer depends on the type of timer associated with the first phase Earth threshold 77 Aplication Guide Page 10 16 DOA 2 1 2 5 Time graded protection Inverse definite minimum time r
36. im should be made to the transport contractor and AEG SAM should be promptly notified 1 2 Electrostatic discharge ESD The relay use components that is sensitive to electrostatic discharges The electronic circuits are well protected by the metal case and the internal module should not be withdrawn unnecessarily When handling the module outside its case care should be taken to avoid contact with components and electrical connections removed from the case for storage the module should be placed in an electrically conducting antistatic bag There are no setting adjustments within the module and it is advised that it is not unnecessarily disassembled Although the printed circuit boards are plugged together the connectors are a manufacturing aid and not intended for freguent dismantling in fact considerable effort may be reguired to separate them Touching the printed circuit board should be avoided since complementary metal oxide semiconductors CMOS are used which can be damaged by static electricity discharged from the body Handling Installation and Case Dimensions Page 3 8 DOA 2 1 2 HANDLING OF ELECTRONIC EOUIPMENT person s normal movements can easily generate electrostatic potentials of several thousand volts Discharge of these voltages into semiconductor devices when handling electronic circuits can cause serious damage which often may not be immediately apparent but the reliability of the circuit will have been r
37. m a local or remote PC computer loaded with software flexibility of use reduced maintenance requirements and ease of integration allow the Relay to provide an adaptable solution for the problems of the protection electric networks Introduction Page 5 5 DOA 2 1 4 MAIN FUNCTIONS The following table shows the functions available for DOA 2 1 relay CE O iH nstantaneousistartcontact f o output sm c Fault Record Event Record RS 485 rear communication Modbus RTU IEC 60870 5 103 Courier DNP3 0 Handling Installation and Case Dimensions DOA 2 1 HANDLING INSTALLATION AND CASE DIMENSIONS Handling Installation and Case Dimensions CONTENTS 1 GENERAL CONSIDERATIONS 1 1 Receipt of relays 1 2 Electrostatic discharge ESD 2 HANDLING OF ELECTRONIC EOUIPMENT 3 RELAY MOUNTING 4 UNPACKING 5 STORAGE 6 DIMENSIONS 7 Communication 7 1 RS232 Port 7 2 RS485 port 8 Earthing Page 1 8 DOA 2 1 A N o o ON Handling Installation and Case Dimensions Page 2 8 DOA 2 1 1 GENERAL CONSIDERATIONS 1 1 Receipt of relay Protective relay although generally of robust construction reguire careful treatment prior to installation on site Upon receipt relay should be examined immediately to ensure no damage has been sustained in transit If damage has been sustained during transit a cla
38. phase to earth faults is a primary reguirement On large networks time co ordination of the overcurrent and earth fault protection relays can often lead to problematic grading situations or as is often the case excessive fault clearance times Such problems can be overcome by relays operating in blocked overcurrent schemes 1 2 SAM DOA 2 1 Overcurrent Relay SAM DOA 2 1 relay is a designed for application to a wide range of power system plant eguipment such as motors generators feeders overhead lines and cables This relay has been designed to provide higher functionality in terms of protections measuring automatic operation and order control They can be applied to industrial and distribution network applications as well as in high voltage and extremely high voltage protection applications They can operate in networks with neutral earthed by impedance by resonant system such as Petersen coil in insulated system and in system with neutral earthed The protection functions can be used associated with the blocking feature in order to optimize the performance of the protection schemes thus reducing operating times 71 Aplication Guide Page 4 16 DOA 2 1 The earth and phase protection functions include instantaneous and time delay information The delay time for the first and second stage for phase and earth fault protections can be chosen to be in definite inverse delay time CO and RI This
39. protection devices Fault sensitivity is an issue common to all voltage levels For transmission systems tower footing resistance can be high Also high resistance faults might be prevalent where lines pass over sandy or rocky terrain Fast discriminative faulted conductor clearance is reguired for these fault conditions The effect of fault resistance is more pronounced on lower voltage systems resulting in potentially lower fault currents which in turn increases the difficulty in the detection of high resistance faults In addition many distribution systems use earthing arrangements designed to limit the passage of earth fault current Earthed methods as such as using resistance Petersen coil or insulated systems make the detection of earth faults arduous Special protection eguipment is often used to overcome these problems Nowadays the supply continuity in the energy distribution is of paramount importance For permanent faults it is essential that only the faulted section of the network is isolated High speed discriminative fault clearance is therefore a fundamental reguirement of any protection scheme on a distribution network 70 Aplication Guide Page 3 16 DOA 2 1 Power transformers are installed at all system voltage levels and have their own specific requirements with regard to protection In order to limit the damage incurred by a transformer under fault conditions fast clearance of the windings with phase to phase and
40. s tend towards infinite when the current approaches 1 general threshold the minimum guaranteed value of the operating current for all the curves with the inverse time characteristic is 1 11 with a tolerance of 0 0515 9 1 1 Inverse Time Curves The first and second stage thresholds for phase earth overcurrent can be selected with an inverse definite minimum time IDMT characteristic The time delay is calculated with a mathematical formula In all there are eleven IDMT characteristics available The mathematical formula applicable to the first ten curves is 1 1 7 1 Where t Operation time K Factor see table Value of measured current Is Value of the programmed threshold pick up value a Factor see table L ANSI IEEE constant zero for IEC and RECT curves T Time multiplier setting from 0 025 to 1 5 Type of curve Standard K factor a factor L factor Short time inverse IEC 0 05 0 04 0 Standard inverse IEC 0 14 0 02 0 Very inverse IEC 13 5 1 0 Extremely inverse IEC 80 2 0 Long time inverse IEC 120 1 0 Short time inverse C02 0 02394 0 02 0 01694 52 Technical Data Page 11 25 DOA 2 1 Type of curve Standard K factor a factor L factor Moderately Inverse ANSI IEEE 0 0515 0 02 0 114 Long time inverse C08 5 95 2 0 18 Very inverse ANSI IEEE 19 61 2 0 491 Extremely inverse ANSI IEEE 28 2 2 0 1217 Rectifier protection RECT 45900 5 6 0
41. starts blinking After all the alarms have been read the LED lights up continuously After acknowledgement of all the alarms the LED is extinguished The alarm LED can be reset either through the front panel or by remote command by a digital input or by a new fault LED 3 Colour YELLOW Label Warning LED 3 indicates internal alarms of the relay When the relay detects a non critical internal alarm typically a communication failure the LED starts blinking continuously When the relay detects a fault that is considered as critical the LED lights up continuously Only the disappearance of the cause of the fault can clear this LED repair of the module clearance of the Fault LED G1 this LED indicates that group1 adjustment is active LED G2 this LED indicates that group2 adjustment is active LED power this LED indicates that power is alive on 22 User Guide Page 6 13 DOA 2 1 2 3 Description of the two areas under the top and bottom flaps There is RS232 port available in the relay This RS232 port can be used either to download a new version of the application software version into the relay flash memory or to plug a laptop loaded with setting software To withdraw more easily the active part of the relay i e the chassis from its case open the two flaps then with a 3mm screwdriver turn the extractor located under the upper flap and pull it out of its case pulling the flaps towards you 23 User Gui
42. ts that the default settings are loaded an alarm is raised The ALARM LED YELLOW will light up and the Watch Dog contact will be activated Only one parameter in the relay s menu needs to be changed to suppress these messages and to reset the watch dog This alarm is only an indication to the user that the relay has its default settings applied SETTING ERROR Should the CPU fails to get correctly store data to the EEPROM during a setting change a HARDWARE ALARM will appear on the LCD display followed by SETTING ERROR message when pushing on the button In addition the ALARM LED YELLOW will light up and the Watch Dog contact will be activated To reset this alarm it is necessary to power ON and OFF the relay Following this the last unsuccessful setting change will then need to be re applied If the alarm persists i e the SETTING ERROR alarm is still displayed please contact AEG sam After Sales Services for advice and assistance 28 User Guide Page 12 13 DOA 2 1 5 MENUS The menu of DOA 2 1 relay is divided into main menus and submenus The available content depends on the model of the relay 5 1 Default display By default the LCD displays the current value measured selected phase or earth As soon as an alarm is detected by the relay that information is considered as more important and the alarm message is then displayed instead of the default value The user can configure the information he wants to display
43. ut of a downstream relay that has detected the presence of fault current above its threshold Thus both upstream and downstream relays can have the same current and time settings and the blocking feature will automatically provide grading If the breaker fail protection is active the blocking order on the upstream relay will be removed if the down stream circuit breaker fails to trip Thus for a fault downstream from relay C the start output from relay C will prevent relay B from operating and the start output of relay B will prevent relay A from 78 Aplication Guide Page 11 16 DOA 2 1 operating Thus all 3 relays could have the same time and current threshold settings and the grading would be obtained by the blocking signal received from a relay closer to the fault This gives a constant close time grading but there will be no back up protection in the event of pilots being short circuited However in practice it is recommended to set the upstream relay to a value that is 10 higher than the downstream relay setting This ensures that the downstream relay successfully blocks the upstream relay when reguired To assign the Blocking Logic functions go under the AUTOMAT CTRL Blocking Logic menu 19 Aplication Guide Page 12 16 DOA 2 1 5 SETTING GROUP SELECTION DOA 2 1 relay has two setting groups associated to the protection functions named PROTECTION G1 and PROTECTION G2 Only one group is active Switching
44. y generates an electrical network alarm The involved threshold is indicated Regarding the phase thresholds the phase designation A B or C is also displayed If several alarms are triggered they are all stored in their order of appearance and presented on the LCD in reverse order of their detection the most recent alarm first the oldest alarm last Each alarm message is numbered and the total number of alarm messages is displayed The user can read all the alarm messages pressing The user acknowledges and clears the alarm messages from the LCD pressing The user can acknowledge each alarm message one by one or all by going to the end of the list to acknowledge and clear all the alarm messages pressing The control of the ALARM LED LED 2 is directly assigned to the status of the alarm messages stored in the memory If one or several messages are NOT READ and NOT ACKNOWLEDGED the ALARM LED LED 2 flashes If all the messages have been READ but NOT ACKNOWLEDGED the ALARM LED LED 2 lights up continuously If all the messages have been ACKNOWLEDGED and cleared if the cause that generated the alarm disappears the ALARM LED LED 2 is extinguished 25 User Guide Page 9 13 DOA 2 1 The different electrical system alarms are listed below le gt le gt gt le gt gt gt gt gt gt gt gt gt tle gt tle gt gt tle gt gt gt tl gt tl gt gt tl gt gt gt LATCH RELAY LATCH
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