GE F60 Instruction Manual

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GE F60 Instruction Manual Manual pdf 329 page image

CHAPTER 5: SETTINGS PRODUCT SETUPF60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-1155Individual fault report features store their files in the same memory space. The sixteenth report overwrites the first oneregardless of which fault report feature produced the sixteenth and the first records.The EnerVista software is required to view all captured data. The relay faceplate display can be used to view the date andtime of trigger, the fault type, the distance location of the fault, and the reclose shot number.The FAULT REPORT 1 SOURCE setting selects the source for input currents and voltages and disturbance detection. For theapplication of entirely parallel lines, the fault report can be programmed to apply compensation for the zero sequencemutual coupling between parallel lines when calculating fault resistance and fault loop impedance. If this compensation isrequired, the ground current (3I_0) from the parallel line must be connected to the ground input CT of the CT bankconfigured under the FAULT REPORT 1 SOURCE with the same polarity as the phase current input configured in the samesource.The FAULT 1 REPORT TRIG setting assigns the FlexLogic operand representing the protection element/elements requiringoperational fault location calculations. The distance to fault calculations are initiated by this signal. The FAULT REPORT 1 Z1MAG, FAULT REPORT 1 Z0 MAG, and FAULT REPORT 1 Z0M MAG impedances are entered in secondary ohms.For the application of entirely parallel lines, Z0M MAG/ANG is the mutual zero-sequence impedance for the whole line,required to compensate the calculation of fault resistance and fault loop impedance.The FAULT REPORT 1 VT SUBSTITUTION setting is set to “None” if the relay is fed from wye-connected VTs. If delta-connectedVTs are used, and the relay is supplied with the neutral (3V0) voltage, this setting is set to “V0”. The method is still exact, asthe fault locator combines the line-to-line voltage measurements with the neutral voltage measurement to re-create theline-to-ground voltages. See the ACTUAL VALUES  RECORDS  FAULT REPORTS menu for details. It is required to configurethe delta and neutral voltages under the source indicated as input for the fault report. Also, the relay checks if the auxiliarysignal configured is marked as “Vn” by the user (under VT setup) and inhibits the fault location if the auxiliary signal islabeled differently.If the broken-delta neutral voltage is not available to the relay, an approximation is possible by assuming the missing zero-sequence voltage to be an inverted voltage drop produced by the zero-sequence current and the user-specifiedequivalent zero-sequence system impedance behind the relay: V0 = –Z0 × I0. In order to enable this mode of operation, theFAULT REPORT 1 VT SUBSTITUTION setting is set to “I0”.The FAULT REP 1 SYSTEM Z0 MAG and FAULT REP 1 SYSTEM Z0 ANGLE settings are used only when the VT SUBSTITUTION settingvalue is “I0”. The magnitude is to be entered in secondary ohms. This impedance is an average system equivalent behindthe relay. It can be calculated as zero-sequence Thevenin impedance at the local bus with the protected line/feederdisconnected. The method is accurate only if this setting matches perfectly the actual system impedance during the fault.If the system exhibits too much variability, this approach is questionable and the fault location results for single-line-to-ground faults is trusted accordingly. Keep in mind that grounding points in the vicinity of the installation impact the systemzero-sequence impedance (grounded loads, reactors, zig-zag transformers, shunt capacitor banks, and so on).5.3.9 Oscillography5.3.9.1 MenuSETTINGS  PRODUCT SETUP  OSCILLOGRAPHY OSCILLOGRAPHY  NUMBER OF RECORDS:5Range: 1 to 64 in steps of 1 TRIGGER MODE:Automatic OverwriteRange: Automatic Overwrite, Protected TRIGGER POSITION:50%Range: 0 to 100% in steps of 1 TRIGGER SOURCE:OffRange: FlexLogic operand AC INPUT WAVEFORMS:16 samples/cycleRange: Off; 8, 16, 32, 64 samples/cycle  DIGITAL CHANNELSSee below