Electro-Voice 1252, 250 operation manual Chapter Transformer Loss Compensation, Introduction

Chapter 7

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.

Ownership Change

M

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.

The need for loss compensated metering may also exist when the ownership changes several miles along a transmission line where it is simply impractical to install metering equipment. Ownership may change at the midway point of a transmission line where there are no substation facilities. In this case, power metering must again be compensated. This condition is shown in Figure 7.2.

M

Point of Ownership

Change

Figure 7.2: Joint Ownership Line Metering Requiring Loss Compensation

Electro Industries/GaugeTech Doc # E107706 V1.25 7-1