How Much Power Can A Three-Phase Electric Meter Withstand And How To Choose The Transformer Multiple

How much power can a three-phase electric meter withstand and how to choose the transformer multiple

The power of the three-phase meter is mainly determined by the current specification of the three-phase meter and the on-site voltage. If it is a DC meter, power P=I current * U voltage * 3. Let's take a look at how much power a three-phase meter can withstand and how to choose a transformer multiple.

1. How much power can a three-phase meter withstand?

If the current specification of the three-phase meter is 40A and the field voltage is 380V, then the power P=40A*380V*3=45600W. Why multiply by a 3, because this is a three-phase meter, 40A*380V is only the power of a phase line, so the three-phase power must be multiplied by 3. The three-phase direct-type electric meter can reach up to 100A, so the maximum power of the direct-type electric meter can only withstand 114,000W of power. If the power is higher than this, the direct-type three-phase meter cannot meet the needs, we need to use the mutual inductance meter.

2. How to choose the transformer multiple

The mutual inductance meter does not limit the power, as long as the multiple of the mutual inductor is reached, any amount of power can be used. For example, what if we want to measure the power of 20,000 W, the current specification of the general transformer type is 1.5(6)A. We can first calculate the current, I=P/U=20000W/380V=53A, then we use the transformer to turn the current into the current within the measurement range of the meter. The current range of the mutual inductance meter is generally 1.5 to 6A. If the current is changed to 5A, 10 times the transformer will be used, so to measure the power of 20,000, only 10 times the transformer will be used.

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