CHAPTER 5: SETTINGS CONTROL ELEMENTSN60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL 5-2215Figure 5-112: Eight-bit comparator logicApplication exampleA three-phase active power measured via SRC 1 on the UR-1 IED is to be sent to a remote location UR-2 via the directinputs/outputs feature. Upon reception the remote power is to be added to a three phase active power measured locallyby the UR-2 IED via SRC 4. The application needs to be accurate under an overload of 25% and a power factor of 1.0 ateither location. An alarm is to be established at the UR-2 location if the total power is above 2500 MW for 50 ms. The alarmis to be cleared if the power is below 2000 MW for 1 second.The following settings and conditions are given.• UR-1: Nominal system voltage = 345 kV, SRC 1 CT ratio = 2000:5, Normal load current = 1.8 kA• UR-2: Nominal system voltage = 220 kV, SRC 4 CT ratio = 3000:5, Normal load current = 2.5 kAThe application requires the following features.For UR-1:Digitizer to prepare the measured power for sending to the UR-2 IED, anddirect outputs to send the digitized power to the UR-2 IEDFor UR-2:842014A4.CDR8BIT COMP 1 BLOCK:8BIT COMP 1 INPUT MODE: 8BIT COMP 1 DIRECTION:8BIT COMP 1 PICKUP: 8BIT COMP 1 HYSTERESIS:8BIT COMP 1 SCALE FACTOR:8BIT COMP 1 ARG A0:8BIT COMP 1 PICKUPDELAY:8BIT COMP 1 RESETDELAY:8BIT COMP 1 ARG B0:8BIT COMP 1 ADD/SUB:8BIT COMP 1 ARG A6:8BIT COMP 1 ARG B6:8BIT COMP 1 ARG A7:8BIT COMP 1 ARG B7:scaling factorscaling factorscaling factorCOMPARESUM-1A-BOffOn+B0.5SETTINGSETTINGSSETTINGSSETTINGSSETTINGSETTINGSFLEXLOGIC OPERANDSFLEXLOGIC OPERANDSACTUAL VALUEACTUAL VALUEACTUAL VALUEOff=0 BLOCK (see description)Off=0Off=0Off=0Off=0Off=0Off=0Off=0......8BIT COMP 1 OP8BIT COMP 1 BIT 08BIT COMP 1 BIT 28BIT COMP 1 BIT 48BIT COMP 1 BIT 68BIT COMP 1 A8BIT COMP 1 Out8BIT COMP 1 B8BIT COMP 1 DPO8BIT COMP 1 PKP8BIT COMP 1 BIT 18BIT COMP 1 BIT 38BIT COMP 1 BIT 58BIT COMP 1 BIT 7t PKP t RST
