ABB RES670 Product Manual

Also see for Relion RES670: Commissioning manual Product guide Installation manual Applications manual Product guide

Contents

ABB RES670 Product Manual Manual pdf 22 page image

Rate-of-change of frequency protection SAPFRC M14965-3 v13The rate-of-change of frequency protection function(SAPFRC ) gives an early indication of a main disturbance inthe system. SAPFRC measures frequency with high accuracy,and can be used for generation shedding, load shedding andremedial action schemes. SAPFRC can discriminate betweena positive or negative change of frequency. A definite timedelay is provided for operate.SAPFRC is provided with an undervoltage blocking. Theoperation is based on positive sequence voltagemeasurement and requires two phase-phase or three phase-neutral voltages to be connected.Frequency time accumulation protection FTAQFVRGUID-020CE8CF-9BEA-455D-ACBD-13023B93B4D1 v5Frequency time accumulation protection (FTAQFVR) is basedon measured system frequency and time counters. FTAQFVRfor generator protection provides the START output for aparticular settable frequency limit, when the system frequencyfalls in that settable frequency band limit and positivesequence voltage within settable voltage band limit. TheSTART signal triggers the individual event timer, which is thecontinuous time spent within the given frequency band, andthe accumulation timer, which is the cumulative time spentwithin the given frequency band. Once the timers reach theirlimit, an alarm or trip signal is activated to protect the turbineagainst the abnormal frequency operation. This function isblocked during generator start-up or shut down conditions bymonitoring the circuit breaker position and current thresholdvalue. The function is also blocked when the system positivesequence voltage magnitude deviates from the given voltageband limit which can be enabled byEnaVoltCheck setting.It is possible to create functionality with more than onefrequency band limit by using multiple instances of thefunction. This can be achieved by a proper configurationbased on the turbine manufacturer specification.8. Multipurpose protectionGeneral current and voltage protection CVGAPC M13083-11 v9The General current and voltage protection (CVGAPC) can beutilized as a negative sequence current protection detectingunsymmetrical conditions such as open phase orunsymmetrical faults.CVGAPC can also be used to improve phase selection forhigh resistive earth faults, outside the distance protectionreach, for the transmission line. Three functions are used,which measures the neutral current and each of the threephase voltages. This will give an independence from loadcurrents and this phase selection will be used in conjunctionwith the detection of the earth fault from the directional earthfault protection function.9. General calculationMultipurpose filter SMAIHPAC GUID-EB0B11C3-FF79-4B8D-A335-649623E832F9 v3The multi-purpose filter function block (SMAIHPAC) isarranged as a three-phase filter. It has very much the sameuser interface (e.g. inputs and outputs) as the standard pre-processing function block SMAI. However the main differenceis that it can be used to extract any frequency componentfrom the input signal. Thus it can, for example, be used tobuild sub-synchronous resonance protection for synchronousgenerator.10. Secondary system supervisionCurrent circuit supervision CCSSPVC M12444-3 v10Open or short circuited current transformer cores can causeunwanted operation of many protection functions such asdifferential, earth-fault current and negative-sequence currentfunctions.Current circuit supervision (CCSSPVC) compares the residualcurrent from a three phase set of current transformer coreswith the neutral point current on a separate input taken fromanother set of cores on the current transformer.A detection of a difference indicates a fault in the circuit andis used as alarm or to block protection functions expected togive inadvertent tripping.Fuse failure supervision FUFSPVC SEMOD113820-4 v12The aim of the fuse failure supervision function (FUFSPVC) isto block voltage measuring functions at failures in thesecondary circuits between the voltage transformer and theIED in order to avoid inadvertent operations that otherwisemight occur.The fuse failure supervision function basically has threedifferent detection methods, negative sequence and zerosequence based detection and an additional delta voltageand delta current detection.The negative sequence detection algorithm is recommendedfor IEDs used in isolated or high-impedance earthednetworks. It is based on the negative-sequence quantities.The zero sequence detection is recommended for IEDs usedin directly or low impedance earthed networks. It is based onthe zero sequence measuring quantities.The selection of different operation modes is possible by asetting parameter in order to take into account the particularearthing of the network.A criterion based on delta current and delta voltagemeasurements can be added to the fuse failure supervisionfunction in order to detect a three phase fuse failure, which inpractice is more associated with voltage transformerswitching during station operations.1MRK 511 410-BEN BPhasor measurement unit RES670 2.2Product version: 2.222 ABB