GE Grid Solutions Multilin 9450 - Page 107

CHAPTER 7: TRANSFORMER LOSS COMPENSATION EPM 9450/9650 METER'S TRANSFORMER LOSS COMPENSATION
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 7–7
TrfIT Secondary is the Base Value of Voltage and Current at the Instrument Transformer
Secondary of the Power Transformer. These numbers are obtained by dividing the
Transformer Voltage and Current by their respective Multipliers. The Meter/Trf values for
Voltage and Current are obtained by dividing the Meter Base values by the TrfIT Secondary
values.
Load Loss at Transformer
No-Load Loss Watts (kW) = 1-Phase kW No-Load Loss = ______________
No-Load Loss VA (kVA)
= (%Exciting Current) * (1-Phase kVA Self-Cooled Rating) / 100
= (______________) * (________________) / 100
= _______________ kVA
No-Load Loss VAR (kVAR)
= SQRT((No-Load Loss kVA)2 - (No-Load Loss kW)2) =
SQRT((_________________)2 - (________________)2)
= SQRT((__________________) - (_________________))
= SQRT (_________________)
= ____________________
Full-Load Loss Watts (kW) = 1-Phase Kw Load Loss = ______________
Full-Load Loss VA (kVA)
= (%Impedance) * (1-Phase kVA Self-Cooled Rating) / 100
= (______________) * (________________) / 100
= _______________ kVA
Full-Load Loss VAR (kVAR)
= SQRT((Full-Load Loss kVA)2 - (Full-Load Loss kW)2)
= SQRT((_________________)2 - (________________)2)
= SQRT((__________________) - (_________________))
= SQRT (_________________)
= _________________
Normalize Losses to Meter Base
Quantity Value at
Trf Base
M/T Factor M/T Factor
Value
Exp M/T Factor w/Exp Value at
Meter Base
No-Load Loss
kW
V
٨2
No-Load Loss
kVAR
V
٨4
Load Loss kW 1
٨2
Load Loss
kVAR
1
٨2