ABB RET670 Ansi pre-configuration of Relion 670 series transformer protection

ABB RET670  Ansi pre-configuration of Relion 670 series transformer protection

• A protection, control, and monitoring IED with extensive functional library and configuration possibilities and expandable hardware design to meet specific user requirements 

• For power transformers, autotransformers, shunt reactors, T-protection, generator transformer blocks, phase shifting transformers and small busbar systems 

• For two- and three-winding transformers with up to six stabilized inputs 

• For multi- or single-breaker arrangements 

• Transformer differential protection with: - Percentage bias restraint for through faults - Waveform and Second harmonic restraint for transformer inrush - Fifth harmonic restraint for overexcitation - High sensitivity for interturn faults 

• Restricted earth fault protection for all direct or low impedance earthed windings - Extremely fast operation - High sensitivity - High and low impedance based 

• Full scheme phase-to-phase and phase-to-earth distance protection with up to five zones: - Alternative choice of quadrilateral function, quadrilateral function or mho function - Sensitive directional earth fault function for high ohmic earthed system. - Load encroachment feature

 • Power swing detection including additional logic 

• Directional power protection - Reverse-, low forward-, active-, reactive power protection - Phase angle compensation - Two steps (alarm/trip) 

• Instantaneous high speed short circuit function with low transient overreach 

• Directional overcurrent protection with four steps for each winding - Each step can be inverse or definite time delayed - Each step can be directional or non-directional 

• Instantaneous high speed earth fault function with low transient overreach 

• Four step directional and/or non-directional phase overcurrent protection - Voltage, current or dual polarized - Each step can be inverse or definite time delayed - Each step can be directional or non-directional - Each step can be blocked on second harmonic component 

• Synchronizing, synchrocheck and dead-line check function for single- or multi-breaker arrangements: - Selectable energizing direction - Two functions with built-in voltage selection - For automatic and manual synchronizing and synchrocheck with different settings - Synchronizing of asynchronous networks with settable breaker closing time 

• Selectable additional software functions such as breaker failure protection for each breaker, voltage protection, overexcitation protection, control and monitoring 

• Sudden pressure relief/Buchholtz, temperature devices etc. through binary inputs stabilized against capacitive discharges 

• Data communication modules for station bus IEC 61850-8-1

• Data communication modules for station bus IEC 60870-5-103, TCP/IP or EIA-485 DNP 3.0, LON and SPA 

• Integrated disturbance and event recorder for up to 40 analog and 96 binary signals 

• Function for energy calculation and demand handling - Outputs from measurement function (MMXU) can be used to calculate energy. Active as well as reactive values are calculated in import respectively export direction. Values can be read or generated as pulses. Maximum demand power values are also calculated by the function. 

• Time synchronization over IEC 61850-8-1, LON, SPA, binary input or with optional GPS module (GSM) or IRIG-B module 

• Analog measurements accuracy up to below 0.5% for power and 0.25% for current and voltage and with site calibration to optimize total accuracy 

• Versatile local human-machine interface 

• Extensive self-supervision with internal event recorder 

• Six independent groups of complete setting parameters with password protection 

• Powerful software PC tool for configuration, setting and disturbance evaluation Functions 

• Differential protection - Transformer differential protection, two winding (PDIF, 87T) - Transformer differential protection, three winding (PDIF, 87T) - Restricted earth fault protection (PDIF, 87N) - High impedance differential protection (PDIF, 87X) 

• Impedance protection - Distance protection zones, Mho (PDIS, 21) - Distance protection zones, Quad (PDIS, 21) - Phase selection with load encroachment, quadrilateral characteristic (PDIS, 21) - Phase selection with load encroachment, Mho (PDIS, 21) - Power swing detection (RPSB, 78) - Power swing logic (RPSL, 78) - Broken conductor check (PTOC, 46) 

• Current protection - Instantaneous phase overcurrent protection (PIOC, 50) - Four step phase overcurrent protection (POCM, 51/67) - Instantaneous residual overcurrent protection (PIOC, 50N) - Four step residual overcurrent protection (PEFM, 51N/67N) - Sensitive directional residual over current and power protection (PSDE) - Thermal overload protection, two time constants (PTTR, 49) - Breaker failure protection (RBRF, 50BF) - Pole discordance protection (RPLD, 52PD) - Directional underpower protection (PDUP, 37) - Directional overpower protection (PDOP, 32) 

• Voltage protection - Two step undervoltage protection (PUVM, 27) - Two step overvoltage protection (POVM, 59) - Two step residual overvoltage protection (POVM, 59N) - Overexcitation protection (PVPH, 24) - Voltage differential protection (PTOV, 60) - Loss of voltage check (PTUV, 27) 

• Frequency protection - Underfrequency protection (PTUF, 81) - Overfrequency protection (PTOF, 81) - Rate-of-change frequency protection (PFRC, 81) 

• Multipurpose protection - General current and voltage protection (GAPC) 

• Secondary system supervision - Current circuit supervision (RDIF) - Fuse failure supervision (RFUF) 

• Control - Synchronizing, synchrocheck and energizing check (RSYN, 25) - Apparatus control for up to 6 bays, max 30 app. (6CBs) incl. Interlocking (APC30) 

• Scheme communication - Scheme communication logic for residual overcurrent protection (PSCH, 85) - Current reversal and weak-end infeed logic for residual overcurrent protection (PSCH, 85) 

• Logic - Tripping logic (PTRC, 94) - Trip matrix logic - Configurable logic blocks - Fixed signal function block 

• Monitoring - Measurements (MMXU) - Supervision of mA input signals (MVGGIO) - Event counter (GGIO) - Event function - Disturbance report (RDRE) 

• Metering - Energy metering (MMTR) - Pulse counter logic (GGIO)

• Station communication - LON communication protocol - SPA communication protocol - IEC 60870-5-103 communication protocol - Horizontal communication via GOOSE - DNP3.0 communication - Single command, 16 signals - Multiple Command, 16 signals each - Ethernet configuration of links • Remote communication - Binary signal transfer • Basic IED functions - Self supervision with internal event list - Time synchronization (TIME) - Parameter setting groups - Test mode functionality (TEST) - Change lock function - IED identifiers - Rated system frequency • Hardware - Power supply module (PSM) - Binary input module (BIM) - Binary output module (BOM) - Static binary output module (SOM) - Binary in/out module (IOM) - mA input module (MIM) - Transformer input module - Optical ethernet module (OEM) - SPA/LON/IEC module (SLM) - DNP3.0 Serial communication module (RS485) - Line data communication module (LDCM) - GPS time synchronization module (GSM) - IRIG-B time synchronization module (IRIG-B) • Accessories - GPS antenna, including mounting kit - External interface converter from C37.94 to G703 resp G703.E1 - High impedance resistor unit - Test switch module RTXP24 - On/off switch

RET 670 provides fast and selective protection,monitoring and control for two- and three-windingtransformers, autotransformers, generator-transformer units, phase shifting transformers, specialrailway transformers and shunt reactors. The transformer IED isdesigned to operate correctly over awide frequency range in order to accommodatepower system frequency variations during disturbances and generator start-up and shut-down.A very fast differential protection function, withautomatic CT ratio matching and vector groupcompensation, makes this IED the ideal solutioneven for the most demanding applications.RET 670 has very low requirements on the mainCTs, no interposing CTs are required. It is suitablefor differential applications with multi-breakerarrangements with up to six restraint CT inputs.

The differential protection function is providedwith 2nd harmonic and wave-block restraint features to avoid tripping for magnetizing inrush, and5th harmonic restraint to avoid tripping for overexcitation.

The differential function offers a high sensitivityfor low-level internal faults. RET 670's unique andinnovative sensitive differential protection feature, based on well-known theory of symmetricalcomponents provide best possible coverage forwinding internalturn-to-turn faults.A low impedance restricted earth-fault protectionfunction is available as complimentary sensitiveand fast main protection against winding earthfaults..

This function includes a directionalzero-sequence current criterion for additional security.Alternatively a high impedance differential function is available. It can be used as restricted earthfault or, as three functions are included, also as differential protection onautotransformers, as differential protection for a tertiary connected reactor, asT-differential protection for the transformer feedern a mesh-corner or ring arrangement, as tertiarybus protection etc.

Tripping from Pressure relief / Buchholz and temperature devices can be done through the IEDwhere pulsing, lock-out etc. is performed. Thebinary inputs are heavily stabilized against disturbance to prevent incorrect operations at e.g. dcsystem capacitive discharges.Distance protection functionality for phase tophase and/or phase to earth faults is available asback-up protection for faults within the transformer and in the connected power system.Versatile phase, earth, positive, negative and zerosequenceovercurrent functions, which can optionally be made directional and/or voltage controlled,provide further alternative backup protection.

Thermal overload, volts per hertz, over/under voltage and over/under frequency protection functionsare also available.Built-in disturbance and event recorder providesvaluable data to the user about status and operationfor post-fault disturbance analysis.Breaker failure protection for each transformerbreaker allow high speed back-up tripping of surrounding breakers.