Reyrolle Protection Devices. 7SG14 Duobias M Transformer Protection. Answers for energy

Transcription

1 Reyrolle Protection Devices 7SG4 Duobias M Transformer Protection Answers for energy

2 7SG4 Duobias M Transformer Protection Description Optional Functionality High Impedance Restricted Earth Fault per winding (REF) Circuit Breaker Fail per winding (5BF) Instantaneous / definite time overcurrent phase fault and derived earth fault per winding (5 and 5N) Inverse definite minimum time phase fault and derived earth fault per winding (5 and 5N) Instantaneous/definite time measured earth fault per winding (5G) Inverse definite minimum time measured earth fault per winding (5G) Overexcitation protection Volts/frequency (2 x DTL x IDMTL) (24) Transformer thermal overload (49) 4-stage under/overvoltage(27/59) 4-stage under/overfrequency (8) 2-stage NPS overcurrent (46) User Interface The 7SG4 Duobias-M has an established history as a transformer protection relay going back to the fundamental development of biased differential transformer protection. It is capable of providing all necessary protection and alarm functions for protecting a 2 or winding transformer. The main protection function is current differential with load bias and second harmonic restraining characteristic. This is supplemented with a number of additional functions to provide a comprehensive transformer protection management package. Function Overview Standard Functionality Biased differential current protection with even harmonic restraint (). Instantaneous differential highset (HS). Integral current amplitude and vector group compensation. Variants for 2 or sets of current transformers. E8, E2 or E6 case. Trip circuit supervision. LEDs for alarm functions removes the need for flag repeat relays, Buchholz etc Compatible with communications software Reydisp Evolution. Metering of external and internal signals for both magnitude and phase angle aids commissioning Settings stored in EEPROM, logic schemes in FLASH memory Flash upgradeable firmware Expandable I/O of up to 27 binary inputs and 29 output contacts that can be programmed from the relay front fascia Continuous self monitoring 2 character x 2 line backlit LCD Menu navigation keys fixed LED. 6 or 2 programmable LEDs. Monitoring Functions Analogue values can be displayed on the LCD screen. In addition most values can be obtained via the data communications channel(s). Line currents for each winding Relay currents for each winding (after ratio and vector group compensation) Operate and restrain currents Binary inputs Output contacts Data Communications Communication access to relay functionality is via a front RS22 port for local PC connection. Two rear ST fibre optic ports (2 x Tx/Rx) and an IRIG-B are also provided. Protocols Serial data comms conform to IEC6-5- and Modbus RTU standards. Siemens Protection Devices Limited 2

3 Description of Functionality The 7SG4 provides all the protection functions required for power transformers. Vector group compensation and ratio correction The relay can compensate for all standard transformer winding vector connections and for differing CT ratios across the transformer, without the need for secondary interposing CTs. Biased differential () A biased differential characteristic is provided which gives sensitivity for internal faults and stability for through faults and load current. Two bias slopes are provided, the first allows for measuring inaccuracies and transformer ratio variation due to tapchanging, the second ensures stability for CT saturation on through faults. The biased differential element restrains for second harmonic inrush currents, with a setting for restraint level. This provides stability under inrush conditions, while allowing the protection to be set more sensitively for normal operation. The relay M is stable for fifth harmonic currents, generated as a result of transformers operating close to, or above their knee point. Differential highset (HS) A differential highset is also provided, this is not subject to inrush restraint. Optional Functionality Restricted Earth Fault (REF) Faults in the tap-changer windings of a transformer are common. Restricted earth-fault protection gives improved sensitivity for faults at the lower end of the transformer windings. Under/overvoltage (27/59) 4 Stage under/overvoltage elements can be provided and the undervoltage elements may be guarded via an additional undervoltage setting to prevent operation during transformer switch on. Backup overcurrent & earth fault The following backup overcurrent elements can be provided: Instantaneous/definite time phase fault (5) Inverse time/definite time phase fault (5) Instantaneous/definite time derived earth fault (5N) Inverse time / definite time derived earth fault (5N) These elements provide backup protection for the transformer and guard against a fault outside the transformer CT zone. They can also be used to protect the transformer against damage due to uncleared external faults while grading with other time-delayed protections. Measured earth fault The following earth-fault overcurrent elements are available for each transformer winding: Instantaneous/definite time measured earth fault (5G) Inverse time/definite time measured earth fault (5G) These elements are incompatible with the use of the high impedance restricted earth-fault elements. Over-excitation (24) Over-excitation of a transformer can lead to damaging currents flowing in the transformer. This can be detected from fifth harmonic content; however this is subject to uncertainty. The 7SG4 can offer a Volts/frequency (V/f) element, which provides direct measurement of excitation. The setting level of this type of element is more easily related to the transformer data. Both DTL and user defined IDMTL characteristics are available. Over fluxing protection is recommended for all generator step up transformers Thermal Overload (49) The algorithm calculates the thermal state of the transformer from the measured currents. Negative Phase Sequence Overcurrent (46) One inverse and one definite time lag element are provided. These may be used as back-up protection or for detection of tap changer faults. Circuit breaker fail (5BF) The circuit breaker fail function operates by monitoring the current following a trip signal and issues an output if the current does not cease within a specified time interval. This output contact can be used to backtrip an upstream circuit breaker. The circuit breaker fail function has a fast reset feature. Under/overfrequency (8) 4 Stage under/overfrequency elements can be provided and these may be inhibited with the undervoltage inhibited setting defined as above, to prevent any unwanted operation. Siemens Protection Devices Limited

4 Application Transformer configurations The Duobias M can provide up to sets of analogue inputs (where a single set consists of phase current inputs and an earth current input) which can be used on a variety of 2 and winding transformer configurations. The most common configurations of transformer are 2 and winding transformers connected to single lines/busbars, as in Figure 2. For a 2 winding transformer 2 analogue input sets are required, while for a winding transformer analogue input sets are needed. Input currents may be summed into a protection element such as overcurrent. Figure 2 shows the flow of fault current for an out-of-zone fault on system, with busbar connected CTs. It is important that the transformer protection is correctly biased to ensure stability for CT saturation. This cannot be done correctly if the CTs are paralleled individual inputs to the transformer protection must be provided for correct biasing. Correct Application Input (a) number of analogue input sets HV LV = 2 (W ) OPERATE (b) HV LV LV = (W W) (a) RESTRAINT (c) HV LV(x2) = (W W) Incorrect Application (d) HV(x2) LV = (W W) 2 Input Fig. Transformer Configurations OPERATE RESTRAINT (b) Fig 2. Out of Zone Fault and its Effect on Protection Biasing use one relay input set per set of CTs Siemens Protection Devices Limited 4

5 Data Storage and Communication Reydisp evolution Sequence of event records Up to 5 events are stored and time tagged to ms resolution. These are available via the communications. Fault records The last fault records are available from the fascia with time and date of trip, measured quantities and type of fault. Disturbance recorder 5 seconds of waveform storage is available and is userconfigurable as 5 x s or x 5s records. Within the record the amount of pre-fault storage is also configurable. The recorder is triggered from a protection operation, or binary input. ( e.g. Buchholz flag indication). The records contain the analogue waveforms of the line currents and the digital input and output signals. The relay settings must be appropriately programmed in order for a wave form to be triggered from an external protection device. Communications Two fibre-optic communications ports are provided on the rear of the relay. They are optimised for 62.5/25μm glassfibre, with BFOC/2.5 (ST ) bayonet style connectors. In addition users may interrogate the relay locally with a laptop PC and the RS22 port on the front of the relay. Fig. Disturbance Records in Reydisp Evolution Reydisp Evolution is common to the entire range of Reyrolle numeric products. It provides a means for the user to apply settings to the relay, interrogate settings and retrieve disturbance waveforms. Reydisp evolution utilises IEC 6-5- protocol. The relay can be user selectable to either IEC 6-5- or Modbus RTU as its communications standard. Siemens Protection Devices Limited 5

6 Technical Data For full technical data refer to the Performance Specification of the Technical Manual. Inputs and Outputs Characteristic energising quantity AC Current/Voltage / 4 6V Current Inputs Frequency 5 / 6Hz Current Withstand Time. x In Continuous.5 x In minutes 4. x In 5 minutes 5. x In minutes 6. x In 2 minutes 25A Second 62 peak I Cycle Input Burden. VA. VA Note: Burdens and impedances are measured at nominal current rating. DC Auxiliary Supply Nominal Voltage Operating Range V dc V 24 to 7.5V 48/V 7.5 to 7.5V 22 V 78. to 28.V /22V 88 to 275V Operate State Quiescent (Typical) Maximum Burden 5 W 27 W Binary inputs Nominal Voltage Operating Range V dc V 8 to 7.5V 48V 7.5 to 6V V.5 to 7.5V 22V 75 to 28V The binary input voltage need not be the same as the main energising voltage. The V and 48V inputs meet the requirements of ESI48-4 ESI. However, the V and 22V inputs will operate with a DC current of less than ma. Where V or 22V inputs compliant with ESI48-4 ESI are required, a relay with 48V binary inputs can be supplied with external series resistors as follows: Nominal Voltage Resistor Value Wattage V 2k7 ± 5% 2.5 W 22 V 8k2 ± 5% 6. W Binary input performance Parameter Value Minimum DC current for ma operation (V and 48V inputs only) Reset/Operate Voltage Ratio 9 % Typical response time < 5 ms Typical response time when < 5 ms used to energise an output relay contact Minimum pulse duration 4 ms Each binary input has an associated timer that can be programmed to give time delayed pick-up and time delayed drop-off. When set to a minimum of 2ms the binary inputs will provide immunity to an AC input signal and will not respond to the following: 25V RMS 5/6 Hz applied for two seconds through a.µf capacitor. 5 V RMS 5/6 Hz applied between each terminal and earth. Discharge of a µf capacitor charged to maximum DC auxiliary supply voltage. Allowable superimposed ac component Allowable breaks/dips in supply (collapse to zero from nominal voltage) 2% of dc voltage 2 ms Siemens Protection Devices Limited 6

7 Output Relays Carry continuously Make and carry (L/R 4 ms and V V) Breaking Capacity ( 5 A and V): AC Resistive AC Inductive DC Resistive DC Inductive Minimum number of operations Minimum recommended load Mechanical ac or dc 2A ac or dc for.5s A ac or dc for.2s 25 VA 25 VA at p.f W W at L/R 4ms 5 W at L/R ms at maximum load.5 Watt limits ma or 5V Transient Overvoltage IEC Between all terminals and earth or between any two independent circuits without damage or flashover High Frequency Disturbance IEC Class III 2.5kV, Longitudinal mode.kv, Transverse mode Electrostatic Discharge IEC Class III 8kV, Contact discharge 5 kv.2/5 µs.5 J % variation 5% variation Vibration (Sinusoidal) IEC Class Fast Transient IEC Class IV.5 gn, Vibration response. gn, Vibration endurance 5% variation 4kV, 5/5ns, 2.5 khz, repetitive % variation Shock Bump IEC Class Radio Frequency Interference IEC gn, Shock response, ms 5 gn, Shock withstand, ms gn, Bump test, 6ms 5% variation V/m, 8 to MHz 5% variation Conducted RFI IEC Seismic IEC Class gn, Seismic response 5% variation V,.5 to 8 MHz 5% variation Conduct limits IEC Mechanical Classification Frequency Range Limits db(µv) Durability Electrical Tests Insulation IEC RMS levels for minute Between all terminals and earth Between independent circuits Across normally open contacts In excess of 6 operations 2. kv 2. kv. kv Quasi-peak Average.5 to.5 MHz to MHz 7 6 Radiated limits IEC Frequency Range Limits at m Quasi-peak, db(µv/m) to 2 MHz 4 2 to MHz 47 Siemens Protection Devices Limited 7

8 Environmental Temperature IEC 68-2-/2 Operating - C to 55 C Storage -25 C to 7 C Humidity IEC Operational test 56 days at 4 C and 9% RH Protection Elements General Reference Conditions General IEC6255 Parts 6, 6A & Auxiliary Nominal Frequency 5/6Hz Ambient Temperature 2ºC Initial Setting Any setting Bias Slope Any setting High set Any setting Restricted earth fault Any setting Magnetizing Inrush Any setting Current amplitude. correction Vector group compensation Yy,º influencing factors Temperature C to 55 C 5% variation Frequency 47 Hz to 52 Hz Setting: 5% variation 57 Hz to 62 Hz Operate Time: 5% variation Vector group compensation Interposing CT No. of elements Per Winding CT Connection Yy, Yd -, Yy2-6, Yd -9, Yy4-2, Yd5-5, Yy6 8, Yd7 5, Yy8 2, Yd9 9, Yy 6, Yd, Ydy CT Multiplier.25 to. step. Biased differential () No. of elements Level Initial setting. to 2.In step.5in Bias slope to.7 step.5 Bias slope limit to 2 xin step In Delay to sec Operate:% of setting ± 5% or ± ma Reset: 9% of operate current Repeatability ±% Through-fault 5 xin stability Operate Time Typically.5 Cycles Inrush Inhibit Settings Off, 5% to 25% step % ± 5% or ± ms Repeatability ± % Bias Phase, Cross, Sum Differential highset (HS) No. of elements Level Initial setting to x In step x In Operate:% of setting ± 5% or ± ma Reset: 95% of operate current Repeatability ±% Operate Time Typically Cycle Restricted earth-fault (REF) No. of elements Level Settings Up to per winding.2 to.96 In step.5in Operate: % of setting ± 5% or ± ma 95% of operate current Repeatability ±% Operate Time Typically Delay Setting (td) <.5 Cycles to 864s Siemens Protection Devices Limited 8

9 Phase-fault overcurrent protection (5) Characteristic No. of elements Level Settings Instantaneous/DTL Up to 2 per winding.5 to 25In step.5in Operate: % of setting ± 5% or ± ma Reset: 95% of operate current Repeatability ±% Delay Settings. to 864s ± 5 ms Repeatability ± % Phase fault overcurrent (5) Characteristic IEC IEEE No. of elements Level Settings IDMTL Normal Inverse (NI), Very Inverse (VI), Extremely Inverse (EI), Long Time Inverse (LTI) Moderately Inverse (MI), Very Inverse (VI), Extremely Inverse (EI), DTL Up to per winding.5 to 2.5 In step.5in Operate: 5% of setting ± 5% or ± ma Reset: 95% of operate current Repeatability ±% IDMTL Time Multiplier Settings.25x to.6x step.25 ± 5% or ± ms Repeatability ± % Negative Sequence Overcurrent (46) Characteristic No. of elements Level Settings Instantaneous (46DT) Up to per winding.2 to 4x In Operate: % Is ± 5% or ± ma Reset: 95% Iop Repeatability ±% Delay Setting (td) to 864s 89ms td Repeatability % or 2ms Characteristics No. of elements Level Setting IDMTL (46IT) Up to per winding.2 to 2.5In Operate 5% Is 4% or I ma Reset > 95% Ipo Repeatability % IDMTL Time Multiplier Characteristics IDMTL IEC Normal Inverse (NI) Very Inverse (VI) Extremely Inverse (EI) Long Time Inverse (LTI) IEEE Moderately Inverse (MI) Very Inverse (VI) Extremely Inverse (EI) DTL Settings.25 to.6x step.25 IDMT 5% or 5ms DTL % or 4ms Repeatability % or 2ms Siemens Protection Devices Limited 9

10 Earth-fault overcurrent protection Characteristic No. of elements Level Settings DTL Up to 2 per winding. to 25 x In Operate: % of setting ± 5% or ± ma Reset: 95% of operate current Repeatability ±% Delay Settings. to 864s ± 5 ms Repeatability ± % Characteristic IDMTL (IEC) IDMTL (IEEE) No. of elements Level Setting Normal Inverse (NI), Very Inverse (VI), Extremely Inverse (EI), Long Time Inverse (LTI) Moderately Inverse (MI), Very Inverse (VI), Extremely Inverse (EI), DTL Up to per winding. to 2.5xIn step.5 In Operate: 5% of setting ± 5% or ± ma Reset: 95% of operate current Repeatability ±% IDMTL Delay Settings.25x to.6x ± 5% or ± ms Circuit breaker failure Characteristic DTL No. of elements 2 Level Settings.5 to 2In Operate: %Is 5% or ma Reset: <%Iop 5% or ma Repeatability ±% Delay Settings Re-trip.2 to 6sec Back-trip.2 to 6sec ± 5 ms Repeatability ± % Siemens Protection Devices Limited

11 Case Dimensions Fig 4. E2 Case Dimensions Fig 5. E6 Case Dimensions Siemens Protection Devices Limited

12 Connection Diagram 7SG4 Duobias M Notes: ) CT circuits shown connected to inputs. 2) NLR and stabilising resistor (to be ordered separately) required for high impedance REF. ) Spare slots may be occupied by either additional I/ O modules (IO2, IO), or additional CT set (AN) up to a maximum of 29 x RL, 27 x SI and CT sets. SI = RL = Status Input Output Relay AUX AUX Shows contacts internal to relay case assembly. Contacts close when the relay chassis is withdrawn from case A A Rear View: Arrangement of terminals and modules B C B C C P U A N A N 2 2 A N or IO 4 Opt IO Opt IO 2 Opt IO Opt P S U AN Case Earth ve 4 -ve 5 Earth 2 ve 2 -ve 25 ve 27 -ve 26 ve 28 -ve P.S.U. S S2 S NO RL NC NC RL2 NO NO RL NC RL4 RL5 AN AN AUX A B C to 6V AN (VT) VT A B C S4 - S5 - S6 - S7 S8 - S9 S - S I/O RL6 RL7 RL8 RL9 RL RL RL2 RL ISO Rx ISO Tx ISORTS ISODTR ISODTR ISOGND ISODTR TX RX TX RX S2 - S - S4 - S5 S6 I/O 2 RL4 RL5 RL6 RL S2 - S2 - S22 - S2 S24 I/O RL22 RL2 RL24 RL S7 S8 - S9 RL8 RL9 RL2 RL S25 S26 - S27 RL26 RL27 RL28 RL Fig 6. 7SG4 Connection Diagram Siemens Protection Devices Limited 2

13 Module Location Module location when viewed from relay front with the fascia door open. E6 case 2 or W A B C D E F G H PSU I/O (I/O2) (I/O) (AN) Or (I/O4) AN2 AN CPU E2 case 2 or W A B C D E F PSU I/O (AN) OR (I/O2) AN2 AN CPU E8 case 2 or W A B C D PSU AN AN2 CPU The following ANSI Function Diagrams illustrate the use of the various models. All transformer vector groups can be accommodated by selection of appropriate relays settings. The? symbol in the MLFB code, shown on these diagrams, denotes a user selection for rating, I/O count and case size. Siemens Protection Devices Limited

14 ANSI Diagrams Two Winding Models 7SG42 Duobias M W W W AN2 AN AN2 AN AN2 AN REF W REF 5 x W 5G x2 W 5 x2 5 REF W REF W 5 5 W 5 HS HS 5ON HS W 5N BD BD 5N BD W 5N DUOBIAS M - DU-2-7SG GD DUOBIAS M - DU-22-7SG GD DUOBIAS M - DU-2-7SG GD W W W 5 5 5ON 5N 5N 5BF HS BD W 5BF W 5 W 5N W 5N 5 5G AN2 AN AN2 AN AN2 AN REF, 5N, 5N can W W W W 5ON be connected to REF 5 5 5OG 5OG 5 5 REF REF either W or CT s HS BD W 5G W 5 5 5ON 5N 46IT 46DT HS BD W 46DT W 46IT W 5 W 5 W 5N W 5N DUOBIAS M - DU-24-7SG GD DUOBIAS M - DU-27-7SG GD DUOBIAS M - DU-29-7SG GD W W W AN2 AN AN2 AN AN2 AN 49 and 5G can be 49 and REF can W W 27/59 5G W 27/59 allocated to either W be allocated to either W 5 x4 REF x4 x2 5 or CT s. W or CT s. REF REF 5 8 x4 24DT x2 24IT x W x4 24DT x2 24IT x W 5 5 W 5 5ON HS W 5N 5ON HS W 5N 5ON HS W 5N 5N 49 BD W 49 W 5N 5N 49 BD W 49 W 5N 5N 5BF BD W 5BF W 5N DUOBIAS M - DU-22-7SG GA DUOBIAS M - DU-22-7SG GA DUOBIAS M - DU-22-7SG GA 24DT OVER FLUXING DTL V/f 24IT OVER FLUXING User Definable Inverse V/f 27 DTL UNDER VOLTAGE - Single Phase 46DT DTL NEGATIVE PH. SEQUENCE OVERCURRENT 46IT IDMTL NEGATIVE PH. SEQ. OVERCURRENT 49 THERMAL OVERLOAD 5 INST/DTL OVER CURRENT ANSI CONNECTION DIAGRAMS DUOBIAS M TWO WINDING TRANSFORMER DIFFERENTIAL RELAYS - 7SG42* FUNCTION NUMBER - IEEE Std C BF TWO STAGE CIRCUIT BREAKER FAIL 5 IDMTL/DTL OVER CURRENT 5G MEASURED INST/DTL EARTH (GROUND) FAULT 5G MEASURED IDMTL/DTL EARTH(GROUND)FAULT 5N DERIVED INST/DTL EARTH (GROUND) FAULT 5N DERIVED IDMTL/DTL EARTH (GROUND) FAULT 59 DTL OVER VOLTAGE - Single Phase ALARM/TRIP LED INDICATION (BUCHHOLZ etc) TRIP CIRCUIT SUPERVISION/FAIL BD BIASED DIFFERENTIAL HS DIFFERENTIAL HIGHSET REF HIGH IMPEDANCE RESTRICTED (GROUND) EARTH FAULT (External series setting resistor and non linear resistor required not shown) Siemens Protection Devices Limited 4

15 ANSI Diagrams Three Winding Models 7SG4 Duobias M ANSI CONNECTION DIAGRAMS THREE WINDING DUOBIAS M TRANSFORMER DIFFERENTIAL RELAYS - 7SG4* 24DT OVER FLUXING DTL V/f 24IT OVER FLUXING User Definable Inverse V/f 27 DTL UNDER VOLTAGE - Single Phase 46DT DTL NEGATIVE PH. SEQUENCE OVERCURRENT 46IT IDMTL NEGATIVE PH. SEQ. OVERCURRENT 49 THERMAL OVERLOAD 5 INST/DTL OVER CURRENT FUNCTION NUMBER - IEEE Std C BF TWO STAGE CIRCUIT BREAKER FAIL 5 IDMTL/DTL OVER CURRENT 5G MEASURED INST/DTL EARTH (GROUND) FAULT 5G MEASURED IDMTL/DTL EARTH(GROUND)FAULT 5N DERIVED INST/DTL EARTH (GROUND) FAULT 5N DERIVED IDMTL/DTL EARTH (GROUND) FAULT 59 DTL OVER VOLTAGE - Single Phase ALARM/TRIP LED INDICATION (BUCHHOLZ etc) TRIP CIRCUIT SUPERVISION/FAIL BD BIASED DIFFERENTIAL HS DIFFERENTIAL HIGHSET REF HIGH IMPEDANCE RESTRICTED (GROUND) EARTH FAULT (External Series Setting Resistor and Non-linear Resistor Required not shown) Siemens Protection Devices Limited 5

16 Siemens Protection Devices Limited 6 Product description Variants Order No. Duobias-M (2 series) 7 S G Two winding transformer differential protection. Relay type 2 series Transformer Protection (2 analogue input sets, 2 winding) Basic protection functionality - included in all models - Vector group compensation and ratio correction - Biased differential protection (BD) - Differential high-set (HS) - Internal protections indication (Buchholz, temperature etc.) () - Trip circuit supervision (TC) 2 Protection options 4 ) Option - Restricted earth-fault (REF) Option 2-2 stage DTL overcurrent (5) - 2 stage DTL measured earth-fault (5G) 2 Option - Restricted earth-fault (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) Option 4 - Restricted earth-fault (one winding) (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - DTL measured earth-fault (one winding) (5G) - IDMTL measured earth-fault (one winding) (5G) - Circuit breaker fail (5BF) 4 Option 7 - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL measured earth-fault (5G) - IDMTL measured earth-fault (5G) 6 Option 9 - Restricted earth-fault (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - DTL NPS DTL overcurrent (46DT) - IDMTL NPS overcurrent (46IT) 9 G D Option 2 - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - 2 stage IDMTL measured earth-fault (one winding) (5G) - 4 stage under/overvoltage (27/59) - 4 stage under/overfrequency (8) - Overexcitation (24) - Thermal overload (one winding) (49) 7 (continued on following page ) Ordering Information 7SG42 Duobias M

17 Product description Variants Order No. Duobias-M (2 series) 7 S G (continued from previous page) Protection options 4 ) 8 Option 2 - Restricted earth-fault (one winding) (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - 4 stage under/overvoltage (27/59) - 4 stage under/overfrequency (8) - Overexcitation (24) - Thermal overload (one winding) (49) Option 2 - Restricted earth-fault (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - Circuit breaker fail (5BF) 9 Auxiliary supply /binary input voltage V DC auxiliary, V DC binary input A V DC auxiliary, 48 V DC binary input B 48/ V DC auxiliary, V DC binary input C 48/ V DC auxiliary, 48 V DC binary input ) D 48/ V DC auxiliary, V DC low burden binary input E 22 V DC auxiliary, V DC low burden binary input F 22 V DC auxiliary, 22 V DC low burden binary input G I/O range Binary Inputs / 5 Binary Outputs (incl. changeover) A E Binary Inputs / Binary Outputs (incl. changeover) 2 ) B 9 Binary Inputs / 2 Binary Outputs (incl. changeover) 2 ) C 27 Binary Inputs / 29 Binary Outputs (incl. changeover) ) D Frequency 5Hz 6Hz 2 Nominal current / 5 A Voltage inputs Not available 6.5/ V AC Housing size Case size E8 (4U high) E Case size E2 (4U high) G Case size E2 (4U wide, vertical) H Case size E6 (4U high) J Case size E6 (4U wide, vertical) K Communication interface Fibre optic (ST-connector) / IEC 6-5- or Modbus RTU B G A )High burden V & 22V binary inputs compliant with ESI48-4 ESI available via external dropper resistors with 48V binary input version, /25 V application, order combination of the following resistor boxes to suit number of binary inputs, VCE:252H64 (9 inputs, V), VCE:252H65 (5 inputs, V), VCE:252H66 ( inputs, V), 22/25 V application, order resistor box 252H66 in addition, VCE:252H67 (5 inputs, 22V), VCE:252H68 ( inputs, 22V), Refer to website for application note about ESI48-4 compliance 2) Case size E2, Case size E6 ) Functions are per winding unless stated otherwise, REF models require external resistors and Metrosil (NLR) at additional cost. Siemens Protection Devices Limited 7

18 Siemens Protection Devices Limited 8 Product description Variants Order No. Duobias-M ( series) 7 S G Three winding transformer differential protection. Relay type series - Transformer Protection ( analogue input sets, winding) Basic protection functionality - included in all models - Vector group compensation and ratio correction - Biased differential protection (BD) - Differential high-set (HS) - Internal protections indication (Buchholz, temperature etc.) () - Trip circuit supervision (TC) Protection options 4 ) Option - Restricted earth-fault (REF) Option 2-2 stage DTL overcurrent (5) - 2 stage DTL measured earth-fault (5G) 2 Option - Restricted earth-fault (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) Option 4 - Restricted earth-fault (one winding) (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - DTL measured earth-fault (two winding) (5G) - IDMTL measured earth-fault (two winding) (5G) - Circuit breaker fail (5BF) 4 Option 6 - Restricted earth-fault (one winding) (REF) - Overexcitation (24) - DTL measured earth-fault (two winding) (5G) - IDMTL measured earth-fault (two winding) (5G) 5 Option 7 - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - DTL measured earth-fault (5G) - IDMTL measured earth-fault (5G) 6 Option 2 - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - 2 stage IDMTL measured earth-fault (two winding) (5G) - 4 stage under/overvoltage (27/59) - 4 stage under/overfrequency (8) - Overexcitation (24) - Thermal overload (one winding) (49) 7 (continued on following page ) Ordering Information 7SG4n Duobias M

19 Product description Variants Order No. Duobias-M ( series) 7 S G (continued from previous page) Protection options 4 ) Option Restricted earth-fault (two winding) (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - 4 stage under/overvoltage (27/59) - 4 stage under/overfrequency (8) - Overexcitation (24) - Thermal overload (one winding) (49) Option 2 - Restricted earth-fault (REF) - DTL overcurrent (5) - IDMTL overcurrent (5) - DTL derived earth-fault (5N) - IDMTL derived earth-fault (5N) - Circuit breaker fail (5BF) 9 Auxiliary supply /binary input voltage V DC auxiliary, V DC binary input A V DC auxiliary, 48 V DC binary input B 48/ V DC auxiliary, V DC binary input C 48/ V DC auxiliary, 48 V DC binary input ) D 48/ V DC auxiliary, V DC low burden binary input E 22 V DC auxiliary, V DC low burden binary input F 22 V DC auxiliary, 22 V DC low burden binary input G I/O range Binary Inputs / 5 Binary Outputs (incl. changeover) 2) A Binary Inputs / Binary Outputs (incl. changeover) 2 ) B 9 Binary Inputs / 2 Binary Outputs (incl. changeover) ) C 27 Binary Inputs / 29 Binary Outputs (incl. changeover) ) D Frequency 5Hz 6Hz 2 Nominal current / 5 A Voltage inputs Not available 6.5/ V AC Housing size Case size E2 (4U high) G Case size E2 (4U wide, vertical) H Case size E6 (4U high) J Case size E6 (4U wide, vertical) K Communication interface Fibre optic (ST-connector) / IEC 6-5- or Modbus RTU B G A ) High burden V & 22V binary inputs compliant with ESI48-4 ESI available via external dropper resistors with 48V binary input version, /25 V application, order combination of the following resistor boxes to suit number of binary inputs, VCE:252H64 (9 inputs, V), VCE:252H65 (5 inputs, V), VCE:252H66 ( inputs, V), 22/25 V application, order resistor box 252H66 in addition, VCE:252H67 (5 inputs, 22V), VCE:252H68 ( inputs, 22V), Refer to website for application note about ESI48-4 compliance 2) Case size E2 ) Case size E6 4) Functions are per winding unless stated otherwise, REF requires external resistors and Metrosil (NLR) at additional extra cost. Siemens Protection Devices Limited 9

20 Published by and copyright 2: Siemens AG Energy Sector Freyeslebenstrasse 958 Erlangen, Germany Siemens Protection Devices Limited P.O. Box 8 North Farm Road Hebburn Tyne & Wear NE TZ United Kingdom Phone: 44 () Fax: 44 () For more information, please contact our Customer Support Center. Phone: 49 8/524 7 Fax: 49 8/ (Charges depending on provider) support.energy@siemens.com Power Distribution Division Order No. E5-K776-C28- Printed in Fürth Printed on elementary chlorine-free bleached paper. All rights reserved. Trademarks mentioned in this document are the property of Siemens AG, its affiliates, or their respective owners. Subject to change without prior notice. The information in this document contains general descriptions of the technical options available, which may not apply in all cases. The required technical options should therefore be specified in the contract. Siemens Protection Devices Limited 2 www. siemens.com/energy