Section 1 General Rules

Norms of acceptance tests. Air circuit breakers

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

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1.8.20. 1. Insulation resistance measurement:

a) support insulators, insulators of quenching chambers and separators, insulating rods and air ducts of switches of all voltage classes. Produced with a megohmmeter for a voltage of 2,5 kV.

If necessary, the measurement of the insulation resistance of support insulators, insulators of quenching chambers and separators should be carried out with the installation of guard rings on the outer surface.

The insulation resistance must not be lower than the values ​​given in Table 1.8.17.

b) secondary circuits, windings of electromagnets of switching on and off. Produced in accordance with 1.8.37.

2. Power frequency overvoltage test:

a) insulation of switches. Mandatory for circuit breakers up to 35 kV. The supporting porcelain insulation of the switches should be tested with an increased power frequency voltage in accordance with Table 1.8.16. The duration of application of the normalized test voltage is 1 min.

b) insulation of secondary circuits and windings of control electromagnets. Produced in accordance with 1.8.37.

3. DC resistance measurement:

a) contacts of air circuit breakers of all voltage classes. The resistance of the contacts of each element of the quenching chamber, the separator separately is subject to measurement. The highest allowable resistance values ​​​​of the contacts of air circuit breakers are given in Table 1.8.18.

b) windings of electromagnets for switching on and off switches. It is set for each type of switches according to the manufacturer's data.

c) the results of measurements of the resistance of the elements of voltage dividers and shunt resistors must comply with the factory standards given in table 1.8.19.

4. Checking the characteristics of the circuit breaker.

The characteristics of the switch, taken at nominal, minimum and maximum working pressures for simple operations and complex cycles, must comply with the manufacturer's data.

5. Checking the minimum operating voltage of the circuit breaker.

Air circuit breaker control electromagnets must operate at a voltage of not more than 0,7 Unom when the drive is powered from a DC source and not more than 0,65 Unom when powered from the AC mains through rectifiers and the highest operating pressure of compressed air in the circuit breaker reservoirs. The voltage on the electromagnets must be applied with a push.

6. Testing the circuit breaker by repeated switching on and off.

The number of operations and complex cycles performed by each circuit breaker is set according to Table 1.8.20.

7. Testing capacitors of voltage dividers of air circuit breakers.

Produced in accordance with 1.8.30.

Table 1.8.17. The lowest permissible resistance of the supporting insulation and insulation of the moving parts of air circuit breakers

Table 1.8.18. Limit values ​​of resistance to direct current of contact systems of air circuit breakers ^{1), 2), 3)}

1 Limit values ​​of the resistance of one element (discontinuity) of the quenching chamber and separator and one arc-extinguishing device of the module: VVN series switches - 20 µOhm, VVU, VVB, VVD, VVBK series - 80 µOhm, VNV series - 70 µOhm.

2 For BB type circuit breakers with a voltage of 330-500 kV, the resistance values ​​​​of the following sections of current-carrying circuits should not exceed:

• 50 microohm - for tires connecting the quenching chamber with the compartment;
• 80 µOhm - for the bus connecting the two halves of the separator;
• 10 µOhm - for switching from the separator's hardware output to the connecting bus.

3 The resistance values ​​of each interruption of the arc extinguishing device of the 330-750 kV circuit breakers of the VNV series should not exceed 35 μOhm.

Table 1.8.19. Normalized values ​​of DC resistance of ohmic voltage dividers and shunt resistors *

* The resistance of the shunt resistors to be installed on one pole of the circuit breaker must not differ from each other by more than allowed by the manufacturer's instructions.

Table 1.8.20

Conditions and number of tests of circuit breakers during commissioning *

* When performing operations and complex cycles (clauses 4-9,12-14), test oscillograms must be taken.

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

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