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E154713
7-5
7: Transformer Loss Compensation
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Loss compensation values must be calculated based on the meter installation. As a
result, transformer loss values must be normalized to the meter by converting the
nominal voltage and current and taking into account the number of elements used in
the metering installation. For three-element meters, the installation must be normal-
ized to the phase-to-neutral voltage and the phase current; in two-element meters
the installation must be normalized to the line-to-line voltage and the line
current. This process is described in the following sections.
7.2.1: Loss Compensation in Three Element Installations
Loss compensation is based on the loss and impedance values provided on the trans-
former manufacturer's test report. A typical test report will include at least the follow-
ing information:
• Manufacturer
• Unit serial number
• Transformer MVA rating (Self-Cooled)
• Test voltage
• No load loss watts
• Load loss watts (or full load loss watts)
• % Exciting current @ 100% voltage
• % Impedance
The transformer MVA rating is generally the lowest MVA rating (the self-cooled or OA
rating) of the transformer winding. The test voltage is generally the nominal voltage
of the secondary or low voltage winding. For three-phase transformers these values
will typically be the three-phase rating and the phase-to-phase voltage. All of the test
measurements are based on these two numbers. Part of the process of calculating the
loss compensation percentages is converting the transformer loss values based on the
transformer ratings to the base used by the meter.
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