Section 1 General Rules

Norms of acceptance tests. Capacitors

Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.30. Capacitors for increasing the power factor with voltages below 1 kV are tested according to paragraphs 1, 4, 5; capacitors for increasing power factor with voltages of 1 kV and higher are tested according to paragraphs 1, 2, 4, 5; coupling capacitors, power take-off and dividing capacitors are tested according to paragraphs 1-4; capacitors for overvoltage protection and longitudinal compensation capacitors are tested according to paragraphs 1, 2, 4, 5.

1. Measurement of insulation resistance.

Produced with a megohmmeter for a voltage of 2,5 kV. Insulation resistance between terminals and relative to the capacitor body.

2. Capacitance measurement.

Produced at a temperature of 15-35 ºС. The measured capacity must correspond to the passport data, taking into account the measurement error and the tolerances given in Table 1.8.27.

3. Measurement of the dielectric loss tangent.

The measurement is made on coupling capacitors, power take-off capacitors and voltage divider capacitors.

The measured value of tg δ should not exceed 0,3% (at a temperature of 20 ºС).

4. High voltage test.

The insulation relative to the housing is tested with the capacitor leads shorted.

The value and duration of application of the test voltage is regulated by factory instructions.

Power frequency test voltages for various capacitors are given below:

Power frequency voltage tests may be replaced by a one-minute rectified voltage test at twice the specified test voltages.

5. Testing of the capacitor bank by switching it on three times.

It is carried out by switching on at the rated voltage with control of current values ​​for each phase. Currents in different phases should differ from each other by no more than 5%.

Table 1.8.27. Allowable change in capacitance of the capacitor

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