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Reactive power and power factor measurement in industrial plant

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Reactive power measurement

A varmeter is used to measure the reactive power in an industrial plant that is supplied by an 8300-V, three-phase, four-wire line. The plant load is estimated to be 300 kVA at 0.8 pf.

Reactive power & power factor measurement in industrial plant
Reactive power and power factor measurements in a plant

Design a suitable measuring system.

Figure 1 - Three-phase, four-wire wattmeter circuit.
Figure 1 – Three-phase, four-wire wattmeter circuit.

Calculation Procedure

1. Select Varmeter

The high-line voltage and large load dictate the use of a three-phase varmeter (rated at 120V, 5A) with current and potential transformers.

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Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

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