ABB RES670 Product Manual

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Contents

ABB RES670 Product Manual Manual pdf 11 page image

7. Multipurpose protectionGeneral current and voltage protection CVGAPCThe General current and voltage protection (CVGAPC) can beutilized as a negative sequence current protection detectingunsymmetrical conditions such as open phase or unsymmetricalfaults.CVGAPC can also be used to improve phase selection for highresistive ground faults, outside the distance protection reach,for the transmission line. Three functions are used, whichmeasures the neutral current and each of the three phasevoltages. This will give an independence from load currents andthis phase selection will be used in conjunction with thedetection of the ground fault from the directional ground faultprotection function.8. Secondary system supervisionCurrent circuit supervision CCSRDIF (87)Open or short circuited current transformer cores can causeunwanted operation of many protection functions such asdifferential, ground-fault current and negative-sequence currentfunctions.It must be remembered that a blocking of protection functionsat an occurrence of open CT circuit will mean that the situationwill remain and extremely high voltages will stress thesecondary circuit.Current circuit supervision (CCSRDIF, 87) compares theresidual current from a three phase set of current transformercores with the neutral point current on a separate input takenfrom another set of cores on the current transformer.A detection of a difference indicates a fault in the circuit and isused as alarm or to block protection functions expected to giveunwanted tripping.Fuse failure supervision SDDRFUFThe aim of the fuse failure supervision function (SDDRFUF) is toblock voltage measuring functions at failures in the secondarycircuits between the voltage transformer and the IED in order toavoid unwanted operations that otherwise might occur.The fuse failure supervision function basically has three differentalgorithms, negative sequence and zero sequence basedalgorithms and an additional delta voltage and delta currentalgorithm.The negative sequence detection algorithm is recommended forIEDs used in isolated or high-impedance grounded networks. Itis based on the negative-sequence measuring quantities, a highvalue of voltage without the presence of the negative-sequencecurrent 3I2.The zero sequence detection algorithm is recommended forIEDs used in directly or low impedance grounded networks. Itis based on the zero sequence measuring quantities, a highvalue of voltage 3V0 without the presence of the residualcurrent 3I0.For better adaptation to system requirements, an operationmode setting has been introduced which makes it possible toselect the operating conditions for negative sequence and zerosequence based function. The selection of different operationmodes makes it possible to choose different interactionpossibilities between the negative sequence and zero sequencebased algorithm.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 transformer switchingduring station operations.9. ControlLogic rotating switch for function selection and LHMIpresentation SLGGIOThe logic rotating switch for function selection and LHMIpresentation (SLGGIO) (or the selector switch function block) isused to get a selector switch functionality similar to the oneprovided by a hardware selector switch. Hardware selectorswitches are used extensively by utilities, in order to havedifferent functions operating on pre-set values. Hardwareswitches are however sources for maintenance issues, lowersystem reliability and an extended purchase portfolio. The logicselector switches eliminate all these problems.Selector mini switch VSGGIOThe Selector mini switch VSGGIO function block is amultipurpose function used for a variety of applications, as ageneral purpose switch.VSGGIO can be controlled from the menu or from a symbol onthe single line diagram (SLD) on the local HMI.IEC 61850 generic communication I/O functions DPGGIOThe IEC 61850 generic communication I/O functions (DPGGIO)function block is used to send double indications to othersystems or equipment in the substation. It is especially used inthe interlocking and reservation station-wide logics.Single point generic control 8 signals SPC8GGIOThe Single point generic control 8 signals (SPC8GGIO) functionblock is a collection of 8 single point commands, designed toPhasor measurement unit RES670 ANSI 1MRK511254-BUS BCustomizedProduct version: 1.2ABB 11