GE Multilin 745 Instruction Manual

S2 System Setup 745Transformer Management RelaySetpointshttp://www.GEindustrial.com/multilin 5ñ31GE Multilinï TRANSFORMER TYPE: Enter the transformer connection from the table oftransformer types. Phase correction and zero-sequence removal are performedautomatically as required.If TRANSFORMER TYPE is entered as ì2W External Correctionî or 3W ExternalCorrectionî with a Delta/Wye power transformer, the WINDING 1(3) PHASE CTPRIMARY setting values must be divided by on the Delta current transformerside to compensate the current magnitude. With this correction, the 745 willproperly compare line to neutral currents on all sides of the power transformer.For example, for a 2-Winding Delta/Wye power transformer with Wye connectedcurrent transformers on the Delta side of the power transformer (25000:5ratio), and Delta connected current transformers on the Wye side of the powertransformer (4000:5 ratio), set:TRANSFORMER TYPE = ì2W External ConnectionîWINDING 1 PHASE CT PRIMARY = ì25000:5îWINDING 2 PHASE CT PRIMARY = (4000 / ):5 or ì2309:5îï LOAD LOSS AT RATED LOAD: Enter the load loss at rated load. This value isused for calculation of harmonic derating factor, and in the Insulating Agingfunction. This is an auto-ranging setpoint dependent on the LOW VOLTAGEWINDING RATING value; see ranges in the following tableï LOW VOLTAGE WINDING RATING: Enter the low voltage winding rating.This selection affects the ranges of WINDING 1(3) NOM ÿ-ÿ VOLTAGE, WINDING 1(3)RATED LOAD, MINIMUM TAP POSITION VOLTAGE, and VOLTAGE INCREMENT PER TAP asshown in the table above.ï RATED WINDING TEMP RISE: Determines the type of insulation; for use inthe computation of insulation aging.ï NO-LOAD LOSS: From the transformer data. It is required for insulation agingcalculations This is an auto-ranging setpoint dependent on the LOW VOLTAGEWINDING RATING value; see ranges in the above table.ï TYPE OF COOLING: From Transformer data; required for insulation agingcalculations.ï RATED TOP OIL RISE OVER AMBIENT: Required for insulation agingcalculationsï XFMR THRML CAPACITY: Required for insulation aging calculations. Obtainfrom transformer manufacturerï WINDING TIME CONST: Required for insulation aging calculationsï SET ACCUMULATED LOSS OF LIFE: Required for insulation agingcalculations. Set equal to the estimated accumulated loss of life.Setting Low Voltage Winding Ratingabove 5 kV 1 kV to 5 kV below 1 kVMINIMUM TAPPOSITION VOLTAGE 0.1 to 2000.0 kVin steps of 0.10.01 to 200.00 kVin steps of 0.010.001 to 20.000kVin steps of 0.001VOLTAGEINCREMENT PER TAP 0.01 to 20.00 kVin steps of 0.010.001 to 2.000 kVin steps of 0.0010.0001 to 0.2000kV in steps of0.0001LOAD LOSS AT RATEDLOAD 1 to 20000 kWin steps of 0.10.1 to 2000.0 kWin steps of 0.010.01 to 200.00 kWin steps of 0.001NO LOAD LOSS 0.1 to 2000.0 kWin steps of 10.01 to 200.00 kWin steps of 0.10.001 to 20.000kW in steps of0.01WARNING 33