Air circuit breakers

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3. Standards for testing electrical equipment and apparatus for electrical installations of consumers

Air circuit breakers

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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K, T, M - are produced within the time limits established by the PPR system.

Name of the test	Type of test	Test norms	Directions
11.1. Insulation resistance measurement:	К
1) air ducts, supporting and moving parts made of organic materials		See table. 15 (Annex 3.1)	Produced by a megohmmeter for a voltage of 2500 V
2) multi-element insulators		The resistance of each element of a multi-element insulator must be at least 300 MΩ	Produced with a megohmmeter for a voltage of 2500 V only at a positive ambient temperature
3) secondary circuits, windings of switching on and off electromagnets		Manufactured in accordance with Section 28	Produced by a megohmmeter for a voltage of 1000 V
11.2. Power frequency overvoltage test:
1) support insulation of circuit breakers		The value of the test voltage is taken in accordance with Table. 5(Annex 3.1)	Test duration 1 min.
2) isolation of secondary circuits and windings of EMU	К	Manufactured in accordance with Section 28
11.3. DC resistance measurement:
1) current-carrying circuit	K, T	The limiting values of the resistance of contact systems must correspond to the values \u17b\u3.1bgiven in table. XNUMX (Annex XNUMX)	The resistance of the current-carrying circuit during major repairs is measured for each element separately, during current repairs it is allowed to measure the resistance of the current-carrying circuit as a whole
2) voltage dividers and shunt resistors	K, T	The resistance values must correspond to the values given in Table 17 (Appendix 3.1)	In the absence of standards, the resistance values during measurements must correspond to the data of the initial measurements with a deviation of no more than 5%
3) measurement of resistance of windings and electromagnets and control circuits	K, T, M	The measured values should be: electromagnets type BB-400-15 with forcing: 1st winding - (10 ± 1,5) Ohm; 2st winding - (45 ± 2) Ohm; both windings - (55 ± 3,5) Ohm; electromagnets of the plant "Electroapparat" - (0,39 ± 0,03) Ohm	-
11.4. Checking the operation of the circuit breaker drive at low voltage	K, T	EMU must operate at a voltage of not more than 0,7 U_Mr. when powered by rechargeable batteries and not more than 0,65 U_Mr. when powered from the AC mains through rectifier devices	The test is carried out at the highest operating pressure in the circuit breaker reservoirs. Electromagnets must be energized
11.5. Checking the characteristics of circuit breakers	K, T	When checking the operation of air circuit breakers, the characteristics prescribed by the factory instructions and passports for circuit breakers must be determined.	Types of operations and complex cycles, values of pressures and voltages of the operating current, at which the circuit breakers should be checked, are given in Table. 18(Annex 3.1)
11.6. Testing the circuit breaker by repeated closing and opening	К	The number of operations and complex cycles performed at different pressures is set according to Table. 18 (Annex 3.1)	Testing in the VO cycle is mandatory for all circuit breakers; in cycles OB and OVO - only for circuit breakers intended for operation in the AR mode
11.7. Voltage Divider Capacitor Test	К	Manufactured in accordance with Section 4	-
11.8. Thermal imaging control	М	Produced in accordance with established standards and manufacturer's instructions

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