GE Feeder Management Relay 750 Instruction Manual

GE Multilin 750/760 Feeder Management Relay 5-1315 SETPOINTS 5.9 S8 TESTING55.9.4 SIMULATIONa) MAIN MENUPATH: SETPOINTS ÖØ S8 TESTING ÖØ SIMULATIONwhen in Simulation Mode, the normal protection and control features are not operational. This is indicatedby the 8 Self-Test Warning relay being de-energized. If Simulation Mode is used for field testing on equip-ment, the operator must provide other means of protection and control.A simulation feature is provided for testing the functionality of the relay in response to program conditions, without the needof external AC voltage and current inputs. First time users will find this to be a valuable training tool. System parameterssuch as currents and voltages, phase angles, and system frequency are entered as setpoints. When placed in simulationmode, the relay suspends reading actual AC inputs, generates samples to represent the programmed phasors, and loadsthese samples into the memory to be processed by the relay. Both normal and fault conditions can be simulated to exercisea variety of relay features. There are three sets of input parameters used during simulation, each providing a particularstate of the system, as shown below:• Prefault State: This state simulates the normal operating condition of a feeder carrying load current, by replacing thenormal input parameters with programmed prefault values. Voltages are automatically set to the nominal value pro-grammed in the BUS VT NOMINAL SECONDARY VOLTAGE setpoint. The neutral current is set to zero. Phase currents arebalanced and set to the value programmed in the PREFAULT PHASE A/B/C CURRENT setpoint. The phase angle of eachphase current relative to its corresponding phase neutral voltage is set to the value programmed in the PREFAULT PWRFACTOR ANGLE setpoint. The frequency of voltages and currents are automatically set to the values programmed in theNOMINAL FREQ setpoint.• Fault State: This state simulates the faulted operating condition of a feeder by replacing the normal prefault feederinput parameters with programmed fault values. The magnitude and angle of each bus voltage and current, polarizingcurrent, system frequency and analog input are set to the values programmed under the FAULT VALUES setpoints. Theneutral current is calculated from the vector sum of the phase currents, and 3V 0 from the vector sum of the phase volt-ages.• Postfault State: This state is intended to simulate a feeder that has tripped. Current is automatically set to 0 A. Busvoltages are automatically balanced and set to Phase A-N at 0°, B-N at 120°, and C-N at 240°. The bus voltage mag-nitude and frequency are set to the entered values. The synchronizing voltage is set to the entered values of magni-tude, angle (with respect to phase A-N bus voltage) and frequency.There are two methods of running simulations. If the feeder circuit breaker is connected to the relay and can be opened andclosed, a full operating sequence can be performed. If a breaker is not available, as is often the case, the relay can bemade to simulate a breaker and allow the 760 to exercise its autoreclose feature. The operation of each method isdescribed below.1. If simulation of the feeder breaker is required set the CIRCUIT BRKR SIMULATION setpoint to "Enabled". After therequired simulation setpoints have been entered, the relay is placed in the Prefault State by setting the SIMULATIONSTATE setpoint to "Prefault". The relay replaces the normal AC inputs with those programmed on the PREFAULT VALUESsetpoint page. Logic inputs, except for the 52a and 52b contacts, are monitored normally throughout the simulation.The relay’s simulation of a circuit breaker is indicated by the status of the Breaker Open and Breaker Closed frontpanel indicators. SIMULATION [ENTER] for more SETUP [ENTER] for more See page 5–119. PREFAULT VALUES [ENTER] for more See page 5–122. FAULT VALUES [ENTER] for more See page 5–122. POSTFAULT VALUES [ENTER] for more See page 5–124.ENTERESCAPEð ðMESSAGEESCAPEMESSAGEESCAPEMESSAGEESCAPECAUTION