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How to calculate the multiplier of a three-phase electricity meter?

Views: 2     Author: Site Editor     Publish Time: 2025-02-03      Origin: Site

The multiplier calculation of three-phase electricity meters is mainly based on the matched transformer, and the specific calculation method is as follows:

1、 Basic concept of three-phase meter multiplication rate

The multiplication ratio of a three-phase electricity meter, also known as the transformation ratio, current (voltage) ratio, or current (voltage) ratio, refers to the multiplication ratio of the transformer matched with the energy meter. The actual electricity consumption is equal to the reading on the energy meter multiplied by the multiplier.

2、 Method for calculating the multiplier of three-phase electric meters

Directly view the nameplate of the transformer:

The magnification of a transformer is usually directly marked on its nameplate, such as "200/5" indicating a current transformer ratio of 40 times, and "20/0.2KV" indicating a voltage transformer ratio of 100 times.

Calculate through the formula:

Current transformer multiplier=rated current on the primary side of the transformer/rated current on the secondary side of the transformer

Voltage transformer multiplier=rated voltage on the primary side of the transformer/rated voltage on the secondary side of the transformer

Meter multiplier=current transformer multiplier x voltage transformer multiplier (when there is no voltage transformer, its transformation ratio is calculated as "1")

3、 Actual Calculation Example

Assuming a three-phase electricity meter is equipped with a current transformer of "150/5A" and a voltage transformer of "10/0.1KV" (note: the voltage transformer ratio here is only an example and may be different in practice), then:

Current transformer multiplier=150A/5A=30 times

Voltage transformer multiplier=10KV/0.1KV=100 times

Meter multiplier=30 times x 100 times=3000 times

If the reading on the electricity meter is 100 kWh at this time, the actual electricity consumption is: 100 kWh x 3000 times=300000 kWh, which is 300000 kilowatt hours (kWh).

4、 Precautions

During the calculation process, it is important to ensure that all values have consistent units to avoid calculation errors.

For electric meters with transformers, the actual electricity consumption can only be obtained by multiplying the reading of the meter by the multiplier of the transformer.

In practical operation, it is necessary to strictly follow the instructions for using the electricity meter and transformer to ensure the accuracy and safety of the measurement.

In summary, the multiplication calculation of three-phase electricity meters involves the transformation ratio of current transformers and voltage transformers, and the actual electricity consumption can be obtained through reasonable calculation.

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