Norms of acceptance tests. SFXNUMX circuit breakers

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Norms of acceptance tests. SFXNUMX circuit breakers

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

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1.8.21. 1. Measurement of insulation resistance of secondary circuits and windings of control electromagnets.

The measurement must be carried out according to the instructions in section 1.8.37.

2. Circuit breaker insulation test.

2.1. The insulation test must be carried out with power frequency voltage according to Table 1.8.16. It is allowed not to test circuit breakers filled with SFXNUMX gas at the factory and not subject to opening during the entire service life.

2.2. Testing the insulation of secondary circuits and windings of control electromagnets must be carried out in accordance with the instructions in section 1.8.37.

3. DC resistance measurement.

3.1. Main circuit resistance measurement. The resistance of the main circuit must be measured both as a whole of the entire current-carrying circuit of the pole, and separately for each break of the arc extinguishing device.

The measured values must comply with the manufacturer's specifications.

Measurements are not made for circuit breakers filled with SFXNUMX gas at the factory and not subject to opening during the entire service life.

3.2 Measurement of the resistance of the windings of the control electromagnets and additional resistors in their circuit. The measured resistance values must comply with the manufacturer's specifications.

4. Checking the minimum operating voltage of the switches.

The switches must operate at a voltage of not more than 0,85·Unom when the drive is powered from a DC source; 0,7·Unom when the drive is powered from the AC mains at nominal SFXNUMX gas pressure in the cavities of the circuit breaker and the highest operating pressure in the drive reservoirs. The voltage on the electromagnets must be applied with a push.

5. Testing capacitors of voltage dividers.

Tests must be carried out in accordance with the instructions in 1.8.30.

The value of the measured capacitance must comply with the manufacturer's standard.

6. Checking the characteristics of the circuit breaker.

When checking the operation of SFXNUMX circuit breakers, the characteristics prescribed by the factory instructions must be determined. The results of checks and measurements must correspond to passport data.

7. Testing switches by multiple trials.

Multiple tests - performing closing and opening operations and complex cycles (BO without time delay between operations - for all circuit breakers; RO and OBO - for circuit breakers designed to operate in the AR mode) - must be carried out at different compressed air pressures in the drive and voltages on conclusions of control electromagnets in order to check the serviceability of the switches according to table 1.8.20. Produced at rated voltage at the outputs of the drive electromagnets or at the rated compressed air pressure of the drive.

The number of operations and complex cycles to be performed by the circuit breaker must be:

3-5 turn-on and turn-off operations;
2-3 cycles of each type.

8. Leak test.

The tightness test is carried out using a leak detector. When testing for tightness with a probe of a leak detector, the places of seals of butt joints and welds of the circuit breaker are examined.

The result of the leak test is considered satisfactory if the leak detector shows no leaks. The test is carried out at the nominal pressure of the SFXNUMX gas.

9. Checking the moisture content of the SFXNUMX gas.

The moisture content of the SF50 is determined before filling the circuit breaker with SFXNUMX based on the dew point measurement. The dew point temperature of the SFXNUMX gas should not exceed minus XNUMX ºС.

10. Testing of built-in current transformers.

Tests must be carried out in accordance with the instructions in 1.8.17.

See other articles Section Rules for the installation of electrical installations (PUE).

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