GE Grid Solutions Multilin 9450 - Chapter 7: Transformer Loss Compensation; 7.1 Introduction

EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 7–1
EPM 9450/9650
Chapter 7: Transformer Loss
Compensation
GE
Grid Solutions
Transformer Loss Compensation
7.1 Introduction
The Edison Electric Institute's Handbook for Electricity Metering, Ninth Edition defines Loss
Compensation as:
A means for correcting the reading of a meter when the metering point and point of
service are physically separated, resulting in measurable losses including I2R losses in
conductors and transformers and iron-core losses. These losses may be added to or
subtracted from the meter registration.
Loss compensation may be used in any instance where the physical location of the meter
does not match the electrical location where change of ownership occurs. Most often this
appears when meters are connected on the low voltage side of power transformers when
the actual ownership change occurs on the high side of the transformer. This condition is
shown pictorially in Figure 7.1.
Figure 7-1: Low Voltage Metering Installation Requiring Loss Compensation
It is generally less expensive to install metering equipment on the low voltage side of a
transformer and in some conditions other limitations may also impose the requirement of
low-side metering even though the actual ownership change occurs on the high-voltage
side.
M
Ownership Change