7SR242 Duobias Multi-Function 2-Winding Transformer Protection Relay

Transcription

1 7SR242 Duobias Multi-Funtion 2-Winding Transformer Protetion Relay Doument Release History This doument is issue 2010/06. The list of revisions up to and inluding this issue is: 2010/06 Additional Comms modules option of (RS485 + IRIG-B) and (RS232 + IRIG-B) and typographial revisions 2010/02 Doument reformat due to rebrand 2010/02 Third issue. Software revision 2662H80001 R /07 Seond issue. Software revision 2662H80001R3d /05 First issue Software Revision History 2010/ H80001 R4-3 Revisions to: VT ratio settings, 87BD 1 st bias slope limit setting inrements, CB fail funtion, LED CONFIG menu, DATA STORAGE menu. Added: Open iruit detetion (46BC), CONTROL MODE menu, Close iruit supervision (74CCS), Measured earth fault underurrent (37G), Pulsed output ontats. 2008/ H80001R3d-2. Demand metering. Optional DNP3.0 data omms. 2008/ H80001R3-2b First Release The opyright and other intelletual property rights in this doument, and in any model or artile produed from it (and inluding any registered or unregistered design rights) are the property of Siemens Protetion Devies Limited. No part of this doument shall be reprodued or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protetion Devies Limited, nor shall any model or artile be reprodued from this doument unless Siemens Protetion Devies Limited onsent. While the information and guidane given in this doument is believed to be orret, no liability shall be aepted for any loss or damage aused by any error or omission, whether suh error or omission is the result of negligene or any other ause. Any and all suh liability is dislaimed Siemens Protetion Devies Limited

2 Contents Setion 1: Introdution...6 Current Transformer Ciruits...6 External Resistors...6 Fibre Opti Communiation...6 Front Cover...6 Setion 2: Hardware Desription General Case Front Cover Power Supply Unit (PSU) Operator Interfae/ Fasia Current Inputs Voltage Input Binary inputs Binary outputs (Output Relays) Virtual Input/Outputs Self Monitoring Protetion Healthy/Defetive...19 Setion 3: Protetion Funtions Current Protetion: Differential Protetion ICT Overall Biased Differential (87BD) HS Current Protetion: Phase Overurrent (51, ) Instantaneous Overurrent Protetion () Time Delayed Overurrent Protetion (51) Current Protetion: Derived Earth Fault (N, 51N) Instantaneous Derived Earth Fault Protetion (N) Time Delayed Derived Earth Fault Protetion (51N) Current Protetion: Measured Earth Fault (G, 51G) Instantaneous Measured Earth Fault Protetion (G) Time Delayed Measured Earth Fault Protetion (51G) Current Protetion: High Impedane Restrited Earth Fault (64H) Open Ciruit (46BC) Current Protetion: Negative Phase Sequene Overurrent (46NPS) Current Protetion: Under-Current (37, 37G) Current Protetion: Thermal Overload (49) Voltage Protetion: Over Fluxing (24) Voltage Protetion: Under/Over Voltage (27/59) Voltage Protetion: Neutral Overvoltage (59N) Voltage Protetion: Under/Over Frequeny ()...41 Setion 4: Control Logi Funtions Quik Logi...42 Setion 5: Supervision Funtions Ciruit Breaker Failure (BF) Trip/Close Ciruit Supervision (74TCS/74CCS) Inrush Detetor (HBL2) Siemens Protetion Devies Limited Chapter 1 Page 2 of 52

3 5.4 OverFluxing Detetor (HBL5) Demand...47 Setion 6: Other Features Data Communiations Maintenane Output Matrix Test CB Counters I 2 t CB Wear Data Storage General Event Reords Waveform Reords Fault Reords Demand/Data Log Metering Operating Mode Control Mode Real Time Clok Time Synhronisation Data Comms Time Synhronisation Binary Input Time Synhronisation IRIG-B (Optional) Settings Groups Password Feature...52 List of Figures Figure 1-1 Funtional Diagram: 7SR242n-2aAnn-0AA0 Relay...9 Figure 1-2 Funtional Diagram: 7SR242n-2aAnn-0BA0 Relay...10 Figure 1-3 Funtional Diagram: 7SR242n-2aAnn-0CA0 Relay...11 Figure 1-4 Connetion Diagram: 7SR242 Relay...12 Figure 2-1 7SR24 with LEDs in E8 Case...14 Figure 2-2 Binary Input Logi...17 Figure 2-3 Binary Output Logi...19 Figure 3-1 Biased Differential Charateristi...21 Figure 3-2 Funtional Diagram for Biased Current Differential Protetion...22 Figure 3-3 Differential Highset Charateristi...23 Figure 3-4 Logi Diagram: High Set Current Differential Protetion...24 Figure 3-5 Logi Diagram: Instantaneous Over-urrent Element...25 Figure 3-6 Logi Diagram: Time Delayed Overurrent Element...26 Figure 3-7 Logi Diagram: Instantaneous Derived Earth Fault Element...27 Figure 3-8 Logi Diagram: Derived Time Delayed Earth Fault Protetion...28 Figure 3-9 Logi Diagram: Measured Instantaneous Earth-fault Element...29 Figure 3-10 Logi Diagram: Time Delayed Measured Earth Fault Element (51G)...30 Figure 3-11 Logi Diagram: High Impedane REF (64H)...31 Figure 3-12 Logi Diagram: Open Ciruit Funtion (46BC)...32 Figure 3-13 Logi Diagram: Negative Phase Sequene Overurrent (46NPS)...33 Figure 3-14 Logi Diagram: Underurrent Detetor (37, 37G)...34 Figure 3-15 Logi Diagram: Thermal Overload Protetion (49)...36 Figure 3-16 Inverse Over-fluxing Charateristi (24IT)...37 Figure 3-17 Logi Diagram: Overfluxing Elements (24)...38 Figure 3-18 Logi Diagram: Under/Over Voltage Elements (27/59)...39 Figure 3-19 Logi Diagram: Neutral Overvoltage Element...40 Figure 3-20 Logi Diagram: Under/Over Frequeny Detetor ()...41 Figure 4-1 Sequene Diagram showing PU/DO Timers in Quik Logi (Counter Reset Mode Off)...43 Figure 5-1 Logi Diagram: Ciruit Breaker Fail Protetion (BF) Siemens Protetion Devies Limited Chapter 1 Page 3 of 52

4 Figure 5-2 Logi Diagram: Trip Ciruit Supervision Feature (74TCS)...45 Figure 5-3 Logi Diagram: Close Ciruit Supervision Feature (74CCS)...45 Figure 5-4 Logi Diagram: Inrush Detetor Feature (HBL2)...46 Figure 5-5 Logi Diagram: Overfluxing Detetor Feature (HBL5)...46 List of Tables Table 1-1: 7SR242 Ordering Options...7 Table 2-1 Summary of 7SR24 Relay Configurations...13 Table 6-1 Operation Mode Siemens Protetion Devies Limited Chapter 1 Page 4 of 52

5 Symbols and Nomenlature The following notational and formatting onventions are used within the remainder of this doument: Setting Menu Loation MAIN MENU>SUB-MENU Setting: Elem name -Setting Setting value: value Alternatives: [1st] [2nd] [3rd] Binary input signal visible to user Binary Output visible to user Elem Inhibit Elem Starter List of settings assoiated with a speifi funtion Appropriate list is TRUE when setting seleted. Elem Char Dir Non-Dir Forward Reverse Digital signal not visible to user, to/from another element PhaseAFwd Common setting for multiple funtions Common ontrol input () for multiple funtions. All funtions are enabled when ontrol input is TRUE. Elem Reset Delay start Digital signal not visible to user, internal to this element L1 Dir Blk Funtion. trip Analogue signal with signal desription And Gate (2 inputs shown) IL1 Individual funtions are enabled when assoiated ontrol input () is TRUE. start trip Or Gate (3 inputs shown) 1 EVENT: IEC, Modbus or DNP Where appliable Relay instrument EVENT INST. Exlusive Or (XOR) Gate (3 inputs shown) Siemens Protetion Devies Limited Chapter 1 Page 5 of 52

6 Setion 1: Introdution This manual is appliable to the following relays: 7SR242 Multi-Funtion 2-Winding Transformer Protetion Relay The 7SR242 relay integrates the protetion and ontrol elements required to provide a omplete transformer protetion. The Ordering Options Tables summarise the features available in eah model. General Safety Preautions! Current Transformer Ciruits The seondary iruit of a live CT must not be open iruited. Non-observane of this preaution an result in injury to personnel or damage to equipment.! External Resistors Where external resistors are fitted to relays, these may present a danger of eletri shok or burns, if touhed.! Fibre Opti Communiation Where fibre opti ommuniation devies are fitted, these should not be viewed diretly. Optial power meters should be used to determine the operation or signal level of the devie.! Front Cover The front over provides additional seuring of the relay element within the ase. The relay over should be in plae during normal operating onditions Siemens Protetion Devies Limited Chapter 1 Page 6 of 52

7 Table 1-1: 7SR242 Ordering Options DUOBIAS-M 7 S R A - 0 A 0 Multifuntional 2 winding transformer differential Protetion Produt protetion Transformer 4 Relay Type Differential (2 winding) 2 Case I/O and Fasia E8 ase, 6 CT, 2 EF/REF CT, 1 VT, 9 Binary Inputs / 6 Binary Outputs, 2 16 LEDs E10 ase, 6 CT, 2 EF/REF CT, 1 VT, 19 Binary Inputs / 14 Binary Outputs, 3 24 LEDs Measuring Input 1/5 A, 63.5/110V, /60Hz 2 Auxiliary voltage 30 to 220V DC, binary input threshold 19V DC A 30 to 220V DC, binary input threshold 88V DC B Communiation Interfae Standard version inluded in all models, USB front port, RS485 rear port 1 Standard version plus additional rear F/O ST onnetors (x2) and IRIG-B 2 Standard version plus additional rear RS485 (x1) and IRIG-B 3 Standard version plus additional rear RS232 (x1) and IRIG-B 4 Protool IEC and Modbus RTU (user seletable setting) 1 IEC and Modbus RTU and DNP 3.0 (user seletable) 2 Protetion Funtion Pakages Option A: - HBL2 Inrush Detetor - HBL5 Overfluxing detetor - 87BD Biased urrent differential - 87HS Current differential highest Programmable logi For eah winding/iruit breaker - BF Ciruit breaker fail - 64H High impedane REF - 74TCS/CCS Trip/lose iruit supervision Standard version Inluded in all models Option B: Standard version plus - 37/37G Underurrent - 46BC Open iruit - 46NPS Negative phase sequene overurrent - 49 Thermal overload - Instantaneous phase fault overurrent - G/N Instantaneous earth fault - 51 Time delayed phase fault overurrent - 51G/51N Time delayed earth fault (ontinued on following page ) A B 2010 Siemens Protetion Devies Limited Chapter 1 Page 7 of 52

8 DUOBIAS-M 7 S R A - 0 A 0 (ontinued from previous page) Option C: Standard version - plus - 24 Overfluxing - 27/59 Under/overvoltage - 59N Neutral voltage displaement - Under/overfrequeny - 37/37G Underurrent - 46BC Open iruit - 46NPS Negative phase sequene overurrent - 49 Thermal overload - Instantaneous phase fault overurrent - G/N Instantaneous earth fault - 51 Time delayed phase fault overurrent - 51G/51N Time delayed earth fault Additional Funtionality No Additional Funtionality A C 2010 Siemens Protetion Devies Limited Chapter 1 Page 8 of 52

9 7SR242n-2aAnn-0AA0 W1-I L1 (I A ) BF-1 HBL 2 HBL 5 W1-I L2 (I B ) BF-1 HBL 2 HBL 5 W1-I L3 (I C ) BF-1 HBL 2 HBL 5 I G1 BF-1 I4 64H ICT 87HS 87BD ICT I G2 BF-2 I4 64H 74 CCS (x6) 74 TCS (x6) W2-I L3 (I C ) BF-2 HBL 2 HBL 5 W2-I L2 (I B ) BF-2 HBL 2 HBL 5 W2-I L1 (I A ) BF-2 HBL 2 HBL 5 Figure 1-1 Funtional Diagram: 7SR242n-2aAnn-0AA0 Relay 2010 Siemens Protetion Devies Limited Chapter 1 Page 9 of 52

10 7SR242n-2aAnn-0BA0 W1-I L1 (I A ) 37 (x2) BF-1 (x2) 51 (x2) 49 HBL2 HBL5 W1-I L2 (I B ) 37 (x2) BF-1 (x2) 51 (x2) 49 HBL2 HBL5 W1-I L3 (I C ) 37 (x2) BF-1 (x2) 51 (x2) 49 HBL2 HBL5 N (x2) 51N (x2) 46 BC (x2) 46 NPS (x4) I G1 37G (x2) BF-1 I4 G (x2) 51G (x4) 64H Eah funtion element an be assigned to W1 or W2 CT inputs. ICT NOTE: The use of some funtions are mutually exlusive 87HS 87BD ICT I G2 37G BF-2 I4 G 51G 64H N 51N 46 BC 46 NPS 74 CCS (x6) 74 TCS (x6) W2-I L3 (I C ) BF-2 HBL2 HBL5 W2-I L2 (I B ) BF-2 HBL 2 HBL5 W2-I L1 (I A ) BF-2 HBL 2 HBL5 Figure 1-2 Funtional Diagram: 7SR242n-2aAnn-0BA0 Relay 2010 Siemens Protetion Devies Limited Chapter 1 Page 10 of 52

11 7SR242n-2aAnn-0CA0 W1-IL1 (IA) (x2) BF-1 (x2) (x2) HBL2 HBL5 W1-IL2 (IB) 37 (x2) BF-1 (x2) 51 (x2) 49 HBL2 HBL5 W1-IL3 (IC) 37 (x2) BF-1 (x2) 51 (x2) 49 HBL2 HBL5 N (x2) 51N (x2) 46 BC (x2) 46 NPS (x4) IG1 37G (x2) BF-1 I4 G (x2) 51G (x4) 64H Eah funtion element an be assigned to W1 or W2 CT inputs. ICT NOTE: The use of some funtions are mutually exlusive 87HS 87BD ICT IG2 37G BF-2 I4 G 51G 64H N 51N 46 BC 46 NPS 74 CCS (x6) 74 TCS (x6) W2-IL3 (IC) BF-2 HBL2 HBL5 W2-IL2 (IB) BF-2 HBL 2 HBL5 W2-IL1 (IA) BF-2 HBL 2 HBL5 V1 (VX) 24 (x3) (x4) 59N (x2) (x6) Figure 1-3 Funtional Diagram: 7SR242n-2aAnn-0CA0 Relay 2010 Siemens Protetion Devies Limited Chapter 1 Page 11 of 52

12 2 4 +ve -ve BI 10 7SR242 BO ve -ve +ve BI 11 BI 12 BO 8 BO D Optional I/O C PSU B CT A CT/VT Data Comms (Optional) 12 +ve BI 13 BO ve +ve -ve +ve BI 14 BI 15 BI 16 BO 11 BO 12 BO 13 BO NOTES Rear View Arrangement of terminals and modules 22 +ve BI 17 BI = BO = Binary Input Binary Output 24 +ve BI ve -ve +ve -ve BI 19 D BO Shows ontats internal to relay ase assembly. Contats lose when the relay hassis is withdrawn from ase 28 GND. 5 BO ve -ve +ve -ve BI 1 BI 2 BO ve -ve BI 3 BO A Sreen B Term. C BO 5 BO ve -ve +ve -ve BI 4 BI 5 W2-IL1 (IA) 1A 5A ve -ve +ve -ve BI 6 BI 7 W2-IL2 (IB) 1A 5A ve -ve +ve -ve BI 8 BI 9 W2-IL3 (IC) B 1A 5A A A W1-IL1 (IA) IG2 5A A A W1-IL2 (IB) V1 (VX) A A W1-IL3 (IC) A A IG1 A Figure 1-4 Connetion Diagram: 7SR242 Relay 2010 Siemens Protetion Devies Limited Chapter 1 Page 12 of 52

13 Setion 2: Hardware Desription 2.1 General The struture of the relay is based upon the Multi-funtion hardware platform. The relays are supplied in either size E8 or size E10 ases (where 1 x E = width of approx. 26mm). The hardware design provides ommonality between produts and omponents aross the Multi-funtion range of relays. Table 2-1 Summary of 7SR24 Relay Configurations Relay Current Voltage Binary Output LEDs Case Inputs Inputs Inputs Relays 7SR E8 7SR E10 Relays are assembled from the following modules: 1) Front Fasia with three fixed funtion LEDs and ordering options of onfigurable LEDs. 2) Proessor module 3) Analogue Input module A : 3 x Current + 6 x Binary Inputs 4) Analogue Input module B : 5 x Current + 1 x Voltage. 5) Power Supply and basi Binary Input (BI) and Binary Output (BO). 6) Optional Binary Input/Output Module 7) Optional data omms module 2.2 Case The relays are housed in ases designed to fit diretly into standard panel raks. The two ase options have widths of 208mm (E8) and 260 mm (E10), both have a height of 177 mm (4U). The required panel depth (with wiring learane) is 242 mm. An additional 75 mm depth learane should be allowed to aommodate the bending radius of fibre opti data ommuniations ables if fitted. The omplete relay assembly is withdrawable from the front of the ase. Contats in the ase ensure that the CT iruits remain short-iruited when the relay is removed. The rear terminal bloks omprise M4 female terminals for wire onnetions. Eah terminal an aept two 4mm rimps. Loated at the top rear of the ase is a srew lamp earthing point, this must be onneted to the main panel earth. 2.3 Front Cover With the transparent front over in plae the user only has aess to the and TEST/RESET buttons, allowing all areas of the menu system to be viewed, but preventing setting hanges and ontrol ations. The only ation that is permitted is to reset the Fault Data display, lathed binary outputs and LEDs by using the TEST/RESET button. The front over is used to seure the relay assembly in the ase Siemens Protetion Devies Limited Chapter 1 Page 13 of 52

14 2.4 Power Supply Unit (PSU) The relay PSU an be diretly onneted to any substation d system rated from 30V d to 220V d. In the event of the station battery voltage level falling below the relay minimum operate level the PSU will automatially swith itself off and lath out this prevents any PSU overload onditions ourring. The PSU is reset by swithing the auxiliary supply off then on. 2.5 Operator Interfae/ Fasia The operator interfae is designed to provide a user-friendly method of ontrolling, entering settings and retrieving data from the relay. Figure 2-1 7SR24 with LEDs in E8 Case NOTE: Pushbuttons on over not shown The fasia is an integral part of the relay. Handles are loated at eah side of the element to allow it to be withdrawn from the relay ase. Relay Information Above the LCD three labels are provided, these provide the following information: 1) Produt name and order ode. 2) Nominal urrent rating, rated frequeny, voltage rating, auxiliary d supply rating, binary input supply rating, onfiguration and serial number. 3) Blank label for user defined information. A template is available within the Reydisp program to allow users to reate and print ustomised LED label inserts Siemens Protetion Devies Limited Chapter 1 Page 14 of 52

15 The warning and information labels on the relay fasia provide the following information: Liquid Crystal Display (LCD) A 4 line by 20-harater liquid rystal display indiates settings, instrumentation, fault data and ontrol ommands. To onserve power the display baklighting is extinguished when no buttons are pressed for a user defined period. A setting within the SYSTEM CONFIG menu allows the timeout to be adjusted from 1 to 60 minutes and Off (baklight permanently on). After an hour the display is ompletely de-ativated. Pressing any key will reativate the display. The LCD ontrast an be adjusted using a flat blade srewdriver to turn the srew loated below the ontrast symbol. Turning the srew lokwise inreases the ontrast, anti-lokwise redues the ontrast. PROTECTION HEALTHY LED This green LED is steadily illuminated to indiate that DC voltage has been applied to the relay power supply and that the relay is operating orretly. If the internal relay wathdog detets an internal fault then this LED will ontinuously flash. PICKUP LED This yellow LED is illuminated to indiate that a user seletable funtion(s) has piked up. The LED will self reset after the initiating ondition has been removed. Funtions are assigned to the PICKUP LED in the OUTPUT CONFIG>PICKUP CONFIG menu. TRIP LED This red LED is steadily illuminated to indiate that a user seletable funtion has operated to trip the iruit breaker. Funtions are assigned to the Trip LED using the OUTPUT CONFIG>Trip Contats setting. Operation of the LED is lathed and an be reset by either pressing the TEST/RESET button, energising a suitably programmed binary input, or, by sending an appropriate ommand over the data ommuniations hannel(s). Indiation LEDs Relays have either 8 or 16 user programmable LED indiators. Eah LED an be programmed to be illuminated as either green, yellow or red. Where an LED is programmed to be lit both red and green it will illuminate yellow.. Eah LED an be assigned two different olours dependent upon whether a Start/Pikup or Operate ondition 2010 Siemens Protetion Devies Limited Chapter 1 Page 15 of 52

16 initiates operation. The LED illumination olour is assigned in the OUTPUT CONFIG>LED CONFIG menu for both Pikup and Operate initiation. Funtions are assigned to the LEDs in the OUTPUT CONFIG>OUTPUT MATRIX menu. Eah LED an be labelled by withdrawing the relay and inserting a label strip into the poket behind the front fasia. A template is available to allow users to reate and print ustomised legends. Eah LED an be user programmed as hand or self resetting. Hand reset LEDs an be reset by either pressing the TEST/RESET button, energising a suitably programmed binary input, or, by sending an appropriate ommand over the data ommuniations hannel(s). The status of hand reset LEDs is maintained by a bak up storage apaitor in the event of an interruption to the d.. supply voltage. Standard Keys The relay is supplied as standard with five pushbuttons. The buttons are used to navigate the menu struture and ontrol relay funtions. They are labelled: Inreases a setting or moves up menu. Dereases a setting or moves down menu. TEST/RESET Moves right, an be used to reset seleted funtionality and for LED test (at relay identifier sreen). ENTER Used to initiate and aept settings hanges. CANCEL. Used to anel settings hanges and/or move up the menu struture by one level per press. NOTE: All settings and onfiguration of LEDs, BI, BO and funtion keys an be aessed and set by the user using these keys. Alternatively onfiguration/settings files an be loaded into the relay using ReyDisp. 2.6 Current Inputs In total eight urrent inputs are provided on the Analogue Input modules. Terminals are available for both 1A and 5A inputs. CT ratios are input by the user in the CT/VT CONFIG menu. Current is sampled at 1600Hz for Hz systems and 1920Hz for 60Hz systems (32 samples per yle). The waveform reorder samples and displays urrent input waveforms at 32 samples per yle. 2.7 Voltage Input An optional voltage input is provided on the Analogue Input module A. VT ratios are input by the user in the CT/VT CONFIG menu. Voltage is sampled at 1600Hz for Hz systems and 1920Hz for 60Hz systems (32 samples per yle). The waveform reorder displays the voltage input waveform at 32 samples per yle Siemens Protetion Devies Limited Chapter 1 Page 16 of 52

17 2.8 Binary inputs The binary inputs are opto-ouplers operated from a suitably rated d supply. Relays are fitted with 9 or 19 binary inputs (BI). The user an assign any binary input to any of the available funtions (INPUT CONFIG > INPUT MATRIX). The Power Supply module inludes the relay basi I/O. The module inludes 3 x BI. Pik-up (PU) and drop-off (DO) time delays are assoiated with eah binary input. Where no pik-up time delay has been applied the input may pik up due to indued a voltage on the wiring onnetions (e.g. ross site wiring). The default pik-up time of 20ms provides a immunity. Eah input an be programmed independently. Eah input may be logially inverted to failitate integration of the relay within the user sheme. When inverted the relay indiates that the BI is energised when no d.. is applied. Inversion ours before the PU DO time delay, see fig Eah input may be mapped to any front Fasia indiation LED and/or to any Binary output ontat and an also be used with the internal user programmable logi. This allows the relay to provide panel indiations and alarms. Inverted Inputs Binary Input 1 BI 1 inverted =1 BI 1 P/U Delay BI 1 D/O Delay BI 1 Event INPUT CONFIG> BINARY INPUT CONFIG INPUT CONFIG> INPUT MATRIX (Or gates) Binary Input n BI n inverted =1 BI n P/U Delay BI n D/O Delay BI n Event Logi signals, e.g. '51-1 Inhibit' Figure 2-2 Binary Input Logi 2010 Siemens Protetion Devies Limited Chapter 1 Page 17 of 52

18 2.9 Binary outputs (Output Relays) Relays are fitted with 6 or 14 binary outputs. All outputs are fully user onfigurable and an be programmed to operate from any or all of the available funtions. The Power Supply module inludes the relay basi I/O. The module inludes six binary outputs eah fitted with 1 ontat providing in total 1 x normally losed (NC), 2 x hange-over (CO) and 3 x normally open (NO) ontats. In the default mode of operation binary outputs are self reset and remain energised for a user onfigurable minimum time of up to 60 seonds. If required, outputs an be programmed to operate as hand reset or pulsed. Where an output is programmed to be hand reset and pulsed then the output will be hand reset only. The binary outputs an be used to operate the trip oils of the iruit breaker diretly where the trip oil urrent does not exeed the 'make and arry' ontat rating. The iruit breaker auxiliary ontats or other in-series auxiliary devie must be used to break the trip oil urrent. CB1 and CB2 Trip Contats are assigned in the OUTPUT CONFIG>BINARY OUTPUT CONFIG menu. Operation of a Trip Contat will atuate the Trip Alert sreen where enabled and will initiate both fault reord storage and CB Fail protetion where enabled. When the relay is withdrawn from the ase all normally losed ontats will be open iruited. This should be onsidered in the design of the ontrol and protetion iruitry. Notes on Self Reset Outputs Outputs reset after the initiate ondition is removed, they are subjet to the user definable Minimum Operate Time setting. With a failed breaker ondition the relay may remain operated until urrent flow in the primary system is interrupted by an upstream devie. The relay will then reset and attempt to interrupt trip oil urrent flowing through an output ontat. Where this level is above the break rating of the output ontat an auxiliary relay with heavy-duty ontats should be utilised. Notes on Pulsed Outputs When operated, the output will reset after the user definable Minimum Operate Time setting regardless of the initiating ondition. Notes on Hand Reset Outputs Hand reset outputs an be reset by either pressing the TEST/RESET button, by energising a suitably programmed binary input, or, by sending an appropriate ommand over the data ommuniations hannel(s). On loss of the auxiliary supply hand-reset outputs will reset. When the auxiliary supply is re-established the binary output will remain in the reset state unless the initiating ondition is still present. Binary Output Test The MAINTENANCE>OUTPUT MATRIX TEST menu inludes a faility to test output relays from the relay fasia without the need for a seondary injetion test set. Binary outputs an also be energised from the Reydisp Evolution software pakage where PC failities are available Siemens Protetion Devies Limited Chapter 1 Page 18 of 52

19 Logi signals, e.g. '51-1' Reset LEDs Outputs (TEST/RESET key, Binary Input, Data Comms) BO 1 Hand Reset BO 1 hand reset Min Operate Time 1 S R Q Output 1 Event OUTPUT CONFIG> OUTPUT MATRIX 1 (Or gates) OUTPUT CONFIG> BINARY OUTPUT CONFIG OUTPUT CONFIG> BINARY OUTPUT CONFIG BO n BO n hand reset 1 1 S R Q Output n Event Figure 2-3 Binary Output Logi 2.10 Virtual Input/Outputs The relays have 16 virtual input/outputs, these are internal logi states. Virtual I/O is assigned in the same way as physial Binary Inputs and Binary Outputs. Virtual I/O is mapped from within the INPUT CONFIG > INPUT MATRIX and OUTPUT CONFIG > OUTPUT MATRIX menus. The status of virtual I/O is not stored during power loss Self Monitoring The relay inorporates a number of self-monitoring features. Eah of these features an initiate a ontrolled reset reovery sequene. Supervision inludes a power supply wathdog, ode exeution wathdog, memory heks by heksum and proessor/adc health heks. When all heks indiate the relay is operating orretly the Protetion Healthy LED is illuminated. If an internal failure is deteted, a message will be displayed, also an event will be generated and stored. The relay will reset in an attempt to retify the failure. This will result in de-energisation of any binary output mapped to protetion healthy and flashing of the protetion healthy LED. If a suessful reset is ahieved by the relay the LED and output ontat will revert bak to normal operational mode, and the relay will restart Protetion Healthy/Defetive A normally open ontat an be used to signal protetion healthy. When the relay has DC supply and it has suessfully passed its self-heking proedure then the Protetion Healthy ontats are made. A normally losed ontat is used to signal protetion defetive. When the DC supply is not applied to the relay or a problem is deteted within the relay then this output is de-energised and the normally losed ontats make to provide an external alarm. An alarm an be provided if the relay is withdrawn from the ase. A ontat is provided in the ase at positions of the PSU module, this ontat loses when the relay is withdrawn Siemens Protetion Devies Limited Chapter 1 Page 19 of 52

20 Setion 3: Protetion Funtions 3.1 Current Protetion: Differential Protetion Comprises both biased differential and high-set differential elements. The fundamental frequeny urrent is measured with the line CT inputs. These line urrents are both multiplied and vetor orreted before being applied to the urrent differential elements ICT The Wn ICT Multiplier setting is applied to the line urrents the CT seondary urrents. The multiplier is used to orret any CT ratio mismath so that ideally nominal urrent (ICT OUT = 1A) is applied to the biased differential algorithm. The Wn ICT Connetion setting applies the orret vetor ompensation to the urrent applied to the differential algorithm. The nominal urrent ratio of the virtual interposing CT is 1:1. Note that where Yd settings are applied some urrent distributions will result in a 3 multiplying fator being applied. See Appliations Guide Siemens Protetion Devies Limited Chapter 1 Page 20 of 52

21 3.1.2 Overall Biased Differential (87BD) I W1 I W2 I W1 + I W2 2nd Bias Slope Type 87BD 1 st Bias Slope 87BD Initial Setting Bias (Restraint) Current I + W1 IW2 2 1 st Bias Slope Limit Figure 3-1 Biased Differential Charateristi Figure illustrates the biased differential harateristi. Within the relay the fundamental frequeny RMS line urrents are modified by the ICT Multiplier and ICT Connetion settings (see 3.1.1) before being applied to the biased differential elements. The biased differential elements alulate the operate urrent for eah phase from the vetor sum of winding 1 and winding 2 urrents i.e. I OPERATE = I W1 + I W2. The bias (or restraint) urrent is alulated from the total urrent of winding 1 and winding 2 urrents i.e. I I + I W1 W2 RESTRAIN =. The 87BD Initial setting defines the minimum differential urrent required to operate the relay. The 87BD 1 st Bias Slope setting is used to ensure protetion stability in the presene of steady state errors e.g. the effets of an on-load tap hanger. The 87BD 1 st Bias Slope Limit setting defines the border between the 1 st and 2 nd bias slopes. 87BD 2 nd Bias Slope Type setting allows the user to selet the preferred harateristi shape i.e. Line or Curve. The 87BD 2 nd Bias Slope setting is applied when 87BD 2 nd Bias Slope Type = Line. This setting is used to modify the sensitivity of the differential algorithm at higher urrent levels. The output of 87BD Delay an be mapped to relay outputs. 2 Operation of the biased differential elements an be inhibited from: Inhibit 87BD A binary or virtual input. 87BD Inrush Ation: Inhibit Operation of the inrush urrent detetor 87BD Overfluxing Ation: Inhibit Operation of the overfluxing detetor 2010 Siemens Protetion Devies Limited Chapter 1 Page 21 of 52

22 87BD Element Disabled Enabled Inhibit 87BD 87BD Initial 87BD 1 st Bias Slope 87BD 1 st Bias Slope Limit 87BD 2 nd Bias Slope Type 87BD 2 nd Bias Slope ICT W1 ICT Multiplier W1 ICT Connetion W1-IL1 87BD A Inhibit 87BD B Inhibit A B Pikup trip Pikup 1 General Pikup W1-IL2 W1-IL3 ICT 87BD C Inhibit C trip Pikup trip 1 87BD Delay 87BD W2 ICT Multiplier W2 ICT Connetion W2-IL1 W2-IL2 W2-IL3 HBL2 Element Disabled Enabled Wn-IL1 Wn-IL2 Wn-IL3 HBL2 Setting HBL2 Bias > > > 87BD Inrush Ation Off Inhibit L1 HBL2 L2 HBL2 L3 HBL2 87BD A Inhibit 87BD B Inhibit 87BD C Inhibit HBL5 Element Disabled Enabled Wn-IL1 Wn-IL2 Wn-IL3 HBL5 Setting HBL5 Bias > > > 87BD Overfluxing Ation Off Inhibit L1 HBL5 L2 HBL5 L3 HBL5 87BD A Inhibit 87BD B Inhibit 87BD C Inhibit Figure 3-2 Funtional Diagram for Biased Current Differential Protetion 2010 Siemens Protetion Devies Limited Chapter 1 Page 22 of 52

23 HS I W1 + I W2 Figure 3-3 I I W1 + W2 2 Differential Highset Charateristi Figure illustrates the differential highset harateristi. Within the relay the fundamental frequeny RMS line urrents are modified by the ICT Multiplier and ICT Connetion settings (see 3.1.1) before being applied to the differential highset elements. The differential highset elements alulate the operate urrent for eah phase from the vetor sum of winding 1 and winding 2 urrents i.e. I OPERATE = I W1 + I W2. 87HS Setting defines the differential urrent required to operate the element. The output of 87HS Delay an be mapped to relay outputs. Operation of the highset differential elements an be inhibited from: Inhibit 87HS A binary or virtual input. 87HS Inrush Ation: Inhibit Operation of the inrush urrent detetor 87HS Overfluxing Ation: Inhibit Operation of the overfluxing detetor 2010 Siemens Protetion Devies Limited Chapter 1 Page 23 of 52

24 87HS Element Disabled Enabled Inhibit 87HS 87HS Setting ICT W1 ICT Multiplier 87HS A Inhibit Pikup trip General Pikup W1 ICT Connetion W1-IL1 W1-IL2 W1-IL3 ICT 87HS B Inhibit 87HS C Inhibit Pikup trip Pikup trip 87HS Delay 87HS W2 ICT Multiplier W2 ICT Connetion W2-IL1 W2-IL2 W2-IL3 HBL2 Element Disabled Enabled Wn-IL1 Wn-IL2 Wn-IL3 HBL2 Setting HBL2 Bias > > > 87HS Inrush Ation Off Inhibit L1 HBL2 L2 HBL2 L3 HBL2 87HS A Inhibit 87HS B Inhibit 87HS C Inhibit HBL5 Element Disabled Enabled Wn-IL1 Wn-IL2 Wn-IL3 HBL5 Setting HBL5 Bias > > > 87HS Overfluxing Ation Off Inhibit L1 HBL5 L2 HBL5 L3 HBL5 87HS A Inhibit 87HS B Inhibit 87HS C Inhibit Figure 3-4 Logi Diagram: High Set Current Differential Protetion 2010 Siemens Protetion Devies Limited Chapter 1 Page 24 of 52

25 3.2 Current Protetion: Phase Overurrent (51, ) The optional phase overurrent elements have a ommon setting to measure either fundamental frequeny RMS or True RMS urrent: True RMS urrent: 51/ Measurement = RMS Fundamental Frequeny RMS urrent: 51/ Measurement = Fundamental Instantaneous Overurrent Protetion () Optionally two instantaneous overurrent elements are provided, eah an be seleted to either winding 1 or winding 2. Eah instantaneous element (-n) has independent settings. -n Setting for pik-up urrent and -n Delay follower time delay. The instantaneous elements have transient free operation. Operation of the instantaneous overurrent elements an be inhibited from: Inhibit -n A binary or virtual input. -n Inrush Ation: Inhibit Operation of the inrush detetor funtion. -n Disabled Enabled Inhibit -n -n Setting 1 General Pikup -n Inrush Ation Off L1 HBL2 > -n Delay Inhibit L2 HBL2 > 1 -n L3 HBL2 > /51 Measurement Wn-IL1 Wn-IL2 Wn-IL3 Figure 3-5 Logi Diagram: Instantaneous Over-urrent Element 2010 Siemens Protetion Devies Limited Chapter 1 Page 25 of 52

26 3.2.2 Time Delayed Overurrent Protetion (51) Optionally two time delayed overurrent elements are provided, eah an be seleted to either winding 1 or winding n Setting sets the pik-up urrent level. A number of shaped harateristis are provided. An inverse definite minimum time (IDMT) harateristi is seleted from IEC, ANSI or user defined urves using 51-n Char. A time multiplier is applied to the harateristi urves using the 51-n Time Mult setting. Alternatively, a definite time lag delay (DTL) an be hosen using 51-n Char. When Delay (DTL) is seleted the time multiplier is not applied and the 51-n Delay (DTL) setting is used instead. The full list of operating urves is given in Chapter 2 Settings, Configuration and Instruments Guide. Operating urve harateristis are illustrated in Chapter 3 Performane Speifiation. The 51-n Reset setting an apply a definite time delayed reset, or when onfigured as an ANSI harateristi an ANSI (DECAYING) reset. If ANSI (DECAYING) reset is seleted for an IEC harateristi, the reset will be instantaneous. The reset mode is signifiant where the harateristi has reset before issuing a trip output see Appliations Guide. A minimum operate time for the harateristi an be set using 51-n Min. Operate Time setting. A fixed additional operate time an be added to the harateristi using 51-n Follower DTL setting. Operation of the time delayed overurrent elements an be inhibited from: Inhibit 51-n A binary or virtual input. 51-n Inrush Ation: Inhibit Operation of the inrush detetor funtion. 51-n Element Disabled Enabled Inhibit 51-n 51-n Setting 51-n Char 51-n Time Mult 51-n Delay (DTL) 51-n Min. Operate Time 51-n Follower DTL 51-n Reset 51-n Inrush Ation Off L1 HBL2 Pikup trip 1 General Pikup Inhibit L2 HBL2 Pikup trip L3 HBL2 Pikup trip 1 51-n /51 Measurement Wn-IL1 Wn-IL2 Wn-IL3 Figure 3-6 Logi Diagram: Time Delayed Overurrent Element 2010 Siemens Protetion Devies Limited Chapter 1 Page 26 of 52

27 3.3 Current Protetion: Derived Earth Fault (N, 51N) The earth urrent is derived by alulating the sum of the measured line urrents. These optional elements utilise RMS urrent values of the fundamental frequeny ( or 60Hz) Instantaneous Derived Earth Fault Protetion (N) Optionally two instantaneous derived earth fault elements are provided, eah an be seleted to either winding 1 or winding 2. Eah instantaneous element has independent settings for pik-up urrent N-n Setting and a follower time delay N-n Delay. The instantaneous elements have transient free operation. Operation of the instantaneous earth fault elements an be inhibited from: Inhibit N-nt A binary or virtual input. N-n Inrush Ation: Inhibit Operation of the inrush detetor funtion. Figure 3-7 Logi Diagram: Instantaneous Derived Earth Fault Element 2010 Siemens Protetion Devies Limited Chapter 1 Page 27 of 52

28 3.3.2 Time Delayed Derived Earth Fault Protetion (51N) Optionally two time delayed derived earth fault elements are provided, eah an be seleted to either winding 1 or winding 2. 51N-n Setting sets the pik-up urrent level. A number of shaped harateristis are provided. An inverse definite minimum time (IDMT) harateristi is seleted from IEC, ANSI or user defined urves using 51N-n Char. A time multiplier is applied to the harateristi urves using the 51N-n Time Mult setting. Alternatively, a definite time lag delay (DTL) an be hosen using 51N-n Char. When Delay (DTL) is seleted the time multiplier is not applied and the 51N-n Delay (DTL) setting is used instead. The 51N-n Reset setting an apply a definite time delayed or ANSI (DECAYING) reset. The reset mode is signifiant where the harateristi has reset before issuing a trip output see Appliations Guide. A minimum operate time for the harateristi an be set using the 51N-n Min. Operate Time setting. A fixed additional operate time an be added to the harateristi using the 51N-n Follower DTL setting. Operation of the time delayed earth fault elements an be inhibited from: Inhibit 51N-n A binary or virtual input. 51N-n Inrush Ation: Inhibit Operation of the inrush detetor funtion. 51N-n Element Disabled Enabled Inhibit 51N-n 51N-n Setting 51N-n Charat 51N-n Time Mult 51N-n Delay (DTL) 51N-n Min Operate Time 51N-n Inrush Ation 51N-n Follower DTL 51N-n Reset Off Inhibit HBL2 Pikup trip General Pikup 51N-n Wn-IL1 Wn-IL2 Wn-IL3 I N Figure 3-8 Logi Diagram: Derived Time Delayed Earth Fault Protetion 2010 Siemens Protetion Devies Limited Chapter 1 Page 28 of 52

29 3.4 Current Protetion: Measured Earth Fault (G, 51G) The earth urrent is measured diretly via dediated urrent analogue inputs. These optional elements utilise either RMS or Fundamental urrent values as defined by the 51G/G Measurement setting (MEASURED E/F menu) Instantaneous Measured Earth Fault Protetion (G) Optionally two instantaneous measured earth fault elements are provided, eah an be seleted to either winding 1 or winding 2. Eah instantaneous element has independent settings for pik-up urrent G-n Setting and a follower time delay G-n Delay. The instantaneous elements have transient free operation. Operation of the instantaneous measured earth fault elements an be inhibited from: Inhibit G-n A binary or virtual input. G-n Inrush Ation: Inhibit Operation of the inrush detetor funtion. Figure 3-9 Logi Diagram: Measured Instantaneous Earth-fault Element 2010 Siemens Protetion Devies Limited Chapter 1 Page 29 of 52

30 3.4.2 Time Delayed Measured Earth Fault Protetion (51G) Optionally two time delayed measured earth fault elements are provided, eah an be seleted to either winding 1 or winding 2. 51G-n Setting sets the pik-up urrent level. A number of shaped harateristis are provided. An inverse definite minimum time (IDMT) harateristi is seleted from IEC, ANSI or user defined urves using 51G-n Char. A time multiplier is applied to the harateristi urves using the 51G-n Time Mult setting. Alternatively, a definite time lag (DTL) an be hosen using 51G-n Char. When DTL is seleted the time multiplier is not applied and the 51G-n Delay (DTL) setting is used instead. The 51G-n Reset setting an apply a definite time delayed or ANSI (DECAYING) reset. The reset mode is signifiant where the harateristi has reset before issuing a trip output see Appliations Guide. A minimum operate time for the harateristi an be set using 51G-n Min. Operate Time setting. A fixed additional operate time an be added to the harateristi using 51G-n Follower DTL setting. Operation of the time delayed measured earth fault elements an be inhibited from: Inhibit 51G-n A binary or virtual input. 51G-n Inrush Ation: Inhibit Operation of the inrush detetor funtion. 51G-n Element Disabled Enabled Inhibit 51G-n 51G-n Inrush Ation Off Inhibit HBL2 51G-n Setting 51G-n Charat 51G-n Time Mult 51G-n Delay (DTL) 51G-n Min Operate Time 51G-n Follower DTL 51G-n Reset 51G/G Measurement Pikup General Pikup IG n trip 51G-n Figure 3-10 Logi Diagram: Time Delayed Measured Earth Fault Element (51G) 2010 Siemens Protetion Devies Limited Chapter 1 Page 30 of 52

31 3.5 Current Protetion: High Impedane Restrited Earth Fault (64H) Two high impedane restrited earth fault elements are provided, one for eah transformer winding The relay utilises fundamental urrent measurement values for this funtion. The single phase urrent input is derived from the residual output of line/neutral CTs onneted in parallel. An external stabilising resistor must be onneted in series with this input to ensure that this element provides a high impedane path. 64H Current Setting sets the pik-up urrent level. An output is given after elapse of the 64H Delay setting. An external series stabilising resistor and a parallel onneted voltage limiting non-linear resistor are used with this funtion. See Appliations Guide for advie in speifying suitable omponent values. Operation of the high impedane element an be inhibited from: Inhibit 64H A binary or virtual input. 64H Element Disabled 64H Current Setting Enabled Inhibit 64H > 64H Delay 64H I G Figure 3-11 Logi Diagram: High Impedane REF (64H) 2010 Siemens Protetion Devies Limited Chapter 1 Page 31 of 52

32 3.6 Open Ciruit (46BC) Optionally two open iruit elements are provided, eah an be seleted to either winding 1 or winding 2. The element alulates the ratio of NPS to PPS urrents. Where the NPS:PPS urrent ratio is above 46BC Setting an output is given after the 46BC Delay. The Open Ciruit funtion an be inhibited from Inhibit 46BC A binary or virtual input. Gn 46BC-n U/I Guarded Operation of the underurrent guard funtion. 46BC Element Enabled Disabled Inhibit 46BC 46BC-n U/I Guarded Yes 46BC Setting 46BC-n U/I Guard Setting < < < 46BC Delay IL1 IL2 IL3 NPS Filter I2 46BC PPS Filter I1 Figure 3-12 Logi Diagram: Open Ciruit Funtion (46BC) 2010 Siemens Protetion Devies Limited Chapter 1 Page 32 of 52

33 3.7 Current Protetion: Negative Phase Sequene Overurrent (46NPS) Optionally four NPS urrent elements are provided 2 x 46IT and 2 x 46DT. Eah element an be seleted to either winding 1 or winding 2. The 46IT elements an be onfigured to be either definite time lag (DTL) or inverse definite minimum time (IDMT), 46IT Setting sets the pik-up urrent level for the element. A number of shaped harateristis are provided. An inverse definite minimum time (IDMT) harateristi is seleted from IEC and ANSI urves using 46IT Char. A time multiplier is applied to the harateristi urves using the 46IT Time Mult setting. Alternatively, a definite time lag delay (DTL) an be hosen using 46ITChar. When Delay (DTL) is seleted the time multiplier is not applied and the 46IT Delay (DTL) setting is used instead. The 46IT Reset setting an apply a, definite time delayed or ANSI (DECAYING) reset. The 46DT elements have a DTL harateristi. 46DT Setting sets the pik-up urrent and 46DT Delay the follower time delay. Operation of the negative phase sequene overurrent elements an be inhibited from: Inhibit 46IT A binary or virtual input. Inhibit 46DT A binary or virtual input. 46IT Setting 46IT Char 46IT-n Element Disabled Enabled Inhibit 46IT-n 46IT Time Mult 46IT Delay (DTL) 46IT Reset Pikup trip General Pikup 46IT-n Wn-IL1 Wn-IL2 Wn-IL3 NPS I2 General Pikup 46DT-n Element 46DT Setting 46DT-n Delay Disabled Enabled Inhibit 46DT-n > 46DT-n Figure 3-13 Logi Diagram: Negative Phase Sequene Overurrent (46NPS) 2010 Siemens Protetion Devies Limited Chapter 1 Page 33 of 52

34 3.8 Current Protetion: Under-Current (37, 37G) Optionally two under-urrent elements are provided for both line and measured earth urrent, eah an be seleted to either winding 1 or winding 2. Eah phase has an independent level detetor and urrent-timing element. 37-n Setting sets the pik-up urrent. An output is given after elapse of the 37-n Delay setting. Operation of the under-urrent elements an be inhibited from: Inhibit 37-n A binary or virtual input. Gn 37-n U/I Guarded Operation of the underurrent guard funtion. Inhibit 37G-n A binary or virtual input. 37-n Element Disabled Enabled Inhibit 37-n Yes 37-n U/I Guarded 37-n U/I Guard Setting < < < 1 37-n Setting 37-n Delay Wn IL1 Wn IL2 Wn IL3 < < < 1 37-n 37G-n Element Disabled Enabled 37G-n Setting Inhibit 37G-n 37G-n Delay Ig-n < 37G-n Figure 3-14 Logi Diagram: Underurrent Detetor (37, 37G) 2010 Siemens Protetion Devies Limited Chapter 1 Page 34 of 52

35 3.9 Current Protetion: Thermal Overload (49) Optionally a phase segregated thermal overload element is provided, this an be seleted to either winding 1 or winding 2. The thermal state is alulated using the measured True RMS urrent. Should the urrent rise above the 49 Overload Setting for a defined time an output signal will be initiated. Operate Time (t):- t τ ln I 2 I P ( k I ) = 2 2 B I 2 Where T = Time in minutes τ = 49 Time Constant setting (minutes) In = Log Natural I = measured urrent I P = Previous steady state urrent level k = Constant I B = Basi urrent, typially the same as In k.i B = 49 Overload Setting (I θ ) Additionally, an alarm an be given if the thermal state of the system exeeds a speified perentage of the proteted equipment s thermal apaity 49 Capaity Alarm setting. For the heating urve: I θ = I 2 2 θ (1 e t τ ) 100% Where: θ = thermal state at time t I = measured thermal urrent I θ = 49 Overload setting (or k.i B ) The final steady state thermal ondition an be predited for any steady state value of input urrent where t >τ, I = I 2 θf 2 θ 100% Where: θ F = final thermal state before disonnetion of devie 49 Overload Setting I θ is expressed as a multiple of the relay nominal urrent and is equivalent to the fator k.i B as defined in the IEC255-8 thermal operating harateristis. It is the value of urrent above whih 100% of thermal apaity will be reahed after a period of time and it is therefore normally set slightly above the full load urrent of the proteted devie. The thermal state may be reset from the fasia or externally via a binary input. Thermal overload protetion an be inhibited from: Inhibit 49 A binary or virtual input Siemens Protetion Devies Limited Chapter 1 Page 35 of 52

36 49 Thermal Overload Disabled Enabled Inhibit Overload Setting 49 Time Constant 49 Capaity Alarm ap alarm Wn-IL1 trip 1 49 Alarm ap alarm Wn-IL2 trip ap alarm 1 49 Trip Wn-IL3 trip Figure 3-15 Logi Diagram: Thermal Overload Protetion (49) 2010 Siemens Protetion Devies Limited Chapter 1 Page 36 of 52

37 3.10 Voltage Protetion: Over Fluxing (24) Optionally, three over fluxing elements are provided 2 x 24DT and 1 x 24IT Char elements. The 24DT Elements have a DTL harateristi. 24DT Setting sets the pik-up level and 24DT Delay the follower time delay. An output is given if the Volts/Hertz ratio is above setting for the duration of the delay. The 24DT-n Hysteresis setting allows the user to vary the pik-up/drop-off ratio for the element. The 24IT Element has a user definable shape. 24Xn Point Setting sets the over fluxing (V/f) level for up to 7 user definable points. 24Yn Point Setting sets the operate time for eah of the defined points. The 24IT Reset setting an apply a, definite time delayed reset. Y0 X X0, Y0 point defines urve pik-up X Y6 X X Straight-line between points X X X6, Y6 point defines urve ut-off X X0 X6 X-(V/f) Figure 3-16 Inverse Over-fluxing Charateristi (24IT) Operation of the over fluxing elements an be inhibited from: Inhibit 24IT A binary or virtual input. Inhibit 24DT-n A binary or virtual input Siemens Protetion Devies Limited Chapter 1 Page 37 of 52

38 Figure 3-17 Logi Diagram: Overfluxing Elements (24) 2010 Siemens Protetion Devies Limited Chapter 1 Page 38 of 52

39 3.11 Voltage Protetion: Under/Over Voltage (27/59) Optionally four under/over voltage elements are provided. The relay utilises fundamental voltage measurement values for this funtion. 27/59-n Setting sets the pik-up voltage level for the element. The sense of the element (undervoltage or overvoltage) is set by the 27/59-n Operation setting. Voltage elements are bloked if the measured voltage falls below the 27/59 U/V Guard setting. An output is given after elapse of the 27/59-n Delay setting. The 27/59-n Hysteresis setting allows the user to vary the pik-up/drop-off ratio for the element. Operation of the under/over voltage elements an be inhibited from: Inhibit 27/59-n A binary or virtual input. 27/59-n U/V Guarded Under voltage guard element. 27/59-n Element Disabled Enabled Inhibit 27/59-n Yes 27/59-n U/V Guarded 27/59 U/V Guard Setting < 27/59-n Operation 27/59-n Setting 27/59-n Hysteresis 27/59-n Delay General Pikup V > or < 27/59-n Figure 3-18 Logi Diagram: Under/Over Voltage Elements (27/59) 2010 Siemens Protetion Devies Limited Chapter 1 Page 39 of 52