AQ-T257 Transformer protection device


AQ-T257 Transformer protection device AQ-T257 Transformer protection device Ask for an offer Home Protection relays Transformer protection & control AQ-T257 Transformer protection device Description AQ-T257 is a transformer protection device with a differential protection function and an integrated automatic voltage regulator function. The relay also provides complete current-based and voltage-based protection functions as well as full measurements. You can add up to nine (9) I/O or communication cards into the device for extensive monitoring and control applications. AQ-T257 communicates using various protocols, including the IEC 61850 substation communication standard. The AQ-T257 transformer protection device has two software options: the “A” variant (AQ-T257A) includes all the protection functions for transformers including differential protection, while the “B” variant (AQ-T257B) also includes the automatic voltage regulator that allows you to control more than one transformer at the same time. For more details on the software options, please see the order code below. Highlight: A large I/O capacity. Automatic/manual voltage regulating (AVR) and/or parallel voltage regulating. Complete transformer protection. 2nd and 5th harmonic blocking. Automatic verification of a connection group and nominal value settings. Overloading and through fault statistics for preventive maintenance. Power and energy measurement accuracy of up to 0.2 %. Technical data AQ-T257A – Standard transformer protection functionality AQ-T257B – Standard transformer protection functionality + Transformer AVR (automatic voltage regulator) Non-directional overcurrent (I>; 50/51) - 4 stages (INST, DT or IDMT) Non-directional earth fault (I0>; 50N/51N) - 4 stages (INST, DT or IDMT) Directional overcurrent (Idir>; 67) - 4 stages (INST, DT or IDMT) Directional earth fault (I0dir>; 67N/32N) - 4 stages (INST, DT or IDMT) Negative sequence overcurrent/ Phase current reversal/ Current unbalance (I2>; 46/46R/46L) - 4 stages (INST, DT or IDMT) Harmonic overcurrent (Ih>; 50H/51H/68H) - 4 stages (INST, DT or IDMT) Circuit breaker failure protection (CBFP; 50BF/52BF) Overvoltage (U>; 59) - 4 stages (INST, DT or IDMT) Undervoltage (U<; 27) - 4 stages (INST, DT or IDMT) Neutral overvoltage (U0>; 59N) - 4 stages (INST, DT or IDMT) Sequence voltage (U1/U2>/<; 47/27P/59PN) - 4 stages (INST, DT or IDMT) Overfrequency and underfrequency (f>/<; 81O/81U) - 8 stages (INST or DT) Rate-of-change of frequency (df/dt>/<; 81R) - 8 stages (INST, DT or IDMT) Power protection (P, Q, S>/<; 32) - 4 stages (DT) Volts-per-hertz overexcitation (V/Hz>; 24) Pole slip/Out-of-step protection (78) Resistance temperature detectors (RTD) Transformer status monitoring Transformer thermal overload (TT>; 49T) Generator/transformer differential (Idx>; 87T/87M/87G) Voltage memory Programmable stage (PGx>/<; 99) Arc protection (IArc>/I0Arc>; 50Arc/50NArc) (optional) Number of objects to control and monitor: 10 Number of indicators to monitor: 10 Number of setting groups: 8 Switch-on-to-fault Vector jump (Δφ; 78) Automatic voltage regulator (AVR; 90) Synchrocheck (ΔV/Δa/Δf; 25) Number of object to contol and monitor: 10 Number of indicators to monitor: 10 Number of setting groups: 8 Automatic voltage regulator – parallel control (AVR; 90) Switch-on-to-fault Vector jump (Δφ; 78) Synchrocheck (ΔV/Δa/Δf; 25) Phase, sequence and residual currents (IL1, IL2, IL3, I01, I02) Phase, sequence and residual voltages (UL1, UL2, UL3, U12, U23, U31, U0) Frequency (f) Power (P, Q, S, pf) and Energy (E+, E-, Eq+, Eq-) Power and energy class 0.5 Power and energy measurement accuracy of up to 0.2 % (optional) Current transformer supervision - 2 instances Voltage transformer supervision (60) Circuit breaker wear monitoring Total harmonic distortion (current) Total harmonic distortion (voltage) Fault locator (21FL) Measurement recorder Measurement value recorder Event recorder (max. 15 000 permanent event records) Disturbance recorder (max. 100 records á 5 seconds at 3.2 kHz sampling) Current inputs: 10 Voltage inputs: 4 Digital inputs (fixed): 3 Digital outputs (fixed): 5 Number of empty slots: 9 Digital inputs: +8/16/24/32/40/48/56/64/72 (optional) Digital outputs: +5/10/15/20/25/30 (optional) Milliampere I/O module (4 mA outputs + 1 mA input) Arc protection module (4 sensors + 2 HSO + 1 BI) Communication media (see "Communication" below) External I/O modules (see "Accessories" below) Communication inputs RJ-45 100 Mbps Ethernet (front panel, fixed) RJ-45 100 Mbps Ethernet and RS-485 (rear panel, fixed) 2 x RJ-45 100 Mbps Ethernet with an IRIG-B input (optional) 2 x ST 100 Mbps Ethernet with an IRIG-B input (optional) 2 x LC 100 Mbps Ethernet (PRP/HSR) (optional) RS-232 serial fiber (PP/PG/GP/GG) (optional) Communication protocols IEC 61850 (edition 1) IEC 61850 (edition 2) IEC 60870-5-101/104 IEC 60870-5-103 Modbus/RTU and Modbus/TCP DNP3 SPA AX007 External 6-channel 2-/3-wire RTD input module (pre-configured) AX008 External 8-channel thermocouple and mA input module (pre-configured) AX013 Raising frame (120 mm) AX014 Raising frame (40 mm) AX015 Wall mounting bracket Additional material Application Drawing Device Rear Image Device and Cut-out Image Order Code Download application drawing Download device rear image Download device and cut-out dimensions Download order code Download AQ 200 series flyer, v2.01 (English) AQ 200 series flyer, v2.01 (Finnish) AQ 200 series flyer, v2.01 (Swedish) AQ 200 series product catalog (ANSI), v2.02 (English) AQ 200 series product catalog (IEC), v2.00 (English) AQtivate PRO flyer, v1.00 (English) AQtivate PRO flyer, v1.00 (Finnish) AQ-T257 Instruction manual (v2.11, English) AQ 200 series DNP3 device profile v4.00 (English) AQ 200 series DWG connection drawings (.zip file) AQ 200 series IEC 103 interoperability list v1.00 (English) AQtivate 200 Instruction manual v2.02 (English) Related products AQ-T215 Voltage regulating device AQ-T215 is a voltage regulating device. 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Description

AQ-T257 is a transformer protection device with a differential protection function and an integrated automatic voltage regulator function. The relay also provides complete current-based and voltage-based protection functions as well as full measurements. You can add up to nine (9) I/O or communication cards into the device for extensive monitoring and control applications. AQ-T257 communicates using various protocols, including the IEC 61850 substation communication standard.

The AQ-T257 transformer protection device has two software options: the “A” variant (AQ-T257A) includes all the protection functions for transformers including differential protection, while the “B” variant (AQ-T257B) also includes the automatic voltage regulator that allows you to control more than one transformer at the same time. For more details on the software options, please see the order code below.

Highlight:

A large I/O capacity.
Automatic/manual voltage regulating (AVR) and/or parallel voltage regulating.
Complete transformer protection.
2nd and 5th harmonic blocking.
Automatic verification of a connection group and nominal value settings.
Overloading and through fault statistics for preventive maintenance.
Power and energy measurement accuracy of up to 0.2 %.

Technical data

AQ-T257A – Standard transformer protection functionality
AQ-T257B – Standard transformer protection functionality + Transformer AVR (automatic voltage regulator)

Non-directional overcurrent (I>; 50/51) - 4 stages (INST, DT or IDMT)
Non-directional earth fault (I0>; 50N/51N) - 4 stages (INST, DT or IDMT)
Directional overcurrent (Idir>; 67) - 4 stages (INST, DT or IDMT)
Directional earth fault (I0dir>; 67N/32N) - 4 stages (INST, DT or IDMT)
Negative sequence overcurrent/ Phase current reversal/ Current unbalance (I2>; 46/46R/46L) - 4 stages (INST, DT or IDMT)
Harmonic overcurrent (Ih>; 50H/51H/68H) - 4 stages (INST, DT or IDMT)
Circuit breaker failure protection (CBFP; 50BF/52BF)
Overvoltage (U>; 59) - 4 stages (INST, DT or IDMT)
Undervoltage (U<; 27) - 4 stages (INST, DT or IDMT)
Neutral overvoltage (U0>; 59N) - 4 stages (INST, DT or IDMT)
Sequence voltage (U1/U2>/<; 47/27P/59PN) - 4 stages (INST, DT or IDMT)
Overfrequency and underfrequency (f>/<; 81O/81U) - 8 stages (INST or DT)
Rate-of-change of frequency (df/dt>/<; 81R) - 8 stages (INST, DT or IDMT)
Power protection (P, Q, S>/<; 32) - 4 stages (DT)
Volts-per-hertz overexcitation (V/Hz>; 24)
Pole slip/Out-of-step protection (78)
Resistance temperature detectors (RTD)
Transformer status monitoring
Transformer thermal overload (TT>; 49T)
Generator/transformer differential (Idx>; 87T/87M/87G)
Voltage memory
Programmable stage (PGx>/<; 99)
Arc protection (IArc>/I0Arc>; 50Arc/50NArc) (optional)