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

• 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.