GE Grid Solutions Multilin 9450 - 7.2.1 Loss Compensation in Three Element Installations

CHAPTER 7: TRANSFORMER LOSS COMPENSATION EPM 9450/9650 METER'S TRANSFORMER LOSS COMPENSATION
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 7–5
Correct calculation of loss compensation also requires knowledge of the meter installation.
In order to calculate the loss compensation settings you will need the following
information regarding the meter and the installation:
• Number of meter elements
• Potential Transformer Ratio (PTR)
• Current Transformer Ratio (CTR)
• Meter Base Voltage
• Meter Base Current
This section is limited to application of EPM 9450/9650 meters to three-element metering
installations. As a result, we know that:
• Number of metering elements = 3
• Meter Base Voltage = 120 Volts
• Meter Base Current = 5 Amps
Three-Element Loss Compensation Worksheet
Transformer Data (from Transformer Manufacturer's Test Sheet)
Enter 3-Phase or 1-Phase values. If 3-Phase values are entered, calculate 1-Phase values
by dividing 3-Phase values by three. Convert 1-Phase Loss Watts to 1-Phase kW by
dividing 1-Phase Loss Watts by 1000.
Company Station Name
Date Trf. Bank No.
Trf Manf Trf Serial No.
Calculation by
Winding Voltage MVA Connection
HV - High
∆-Y
XV - Low
∆-Y
YV - Tertiary
∆-Y
Value Watts Loss
3-Phase 1-Phase 1-Phase kW
No-Load Loss
Load Loss
Value 3-Phase MVA 1-Phase MVA 1-Phase kVA
Self-Cooled Rating