Oil and electromagnetic switches

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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

Oil and electromagnetic switches

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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
10.1. Insulation resistance measurement:
1) isolation of moving and guiding parts made of organic material	К	See table. 15 (Annex 3.1)	Produced by a megohmmeter for a voltage of 2500 V
2) insulation of secondary circuits and windings of control electromagnets (hereinafter referred to as EMU)	K, M	Manufactured in accordance with Section 28 (at least 1 MΩ)	Produced by a megohmmeter for a voltage of 1000 V
10.2. Power frequency overvoltage test:	К	Test duration - 1 min.	-
1) support insulation and insulation relative to the body		The value of the test voltage is taken in accordance with Table. 5(Annex 3.1)	For low-oil circuit breakers 6 - 10 kV, the isolation of the contact gap is also tested
2) isolation of secondary circuits and windings of EMU		Manufactured in accordance with Section 28	-
10.3. Bushing test	K, M	Tests are carried out in accordance with the instructions in section 9	-
10.4. Assessment of the state of intra-tank insulation and insulation of arc extinguishing devices of tank oil circuit breakers 35 kV	К	If tgδ of the bushings is reduced by more than 5%, then the insulation must be dried	It is produced if, when measuring tgδ of the bushings on a fully assembled circuit breaker, increased values are obtained compared to the standards given in Table. 14 (Annex 3.1)
10.5. DC resistance measurement:	K, T, M
1) oil switch contacts		The resistance of the current-carrying circuit should not exceed the values \u16b\u3.1bspecified in Table. XNUMX (Appendix XNUMX). The norms for assigning resistance to individual sections of the current-carrying circuit are indicated in the factory instructions	-
2) shunt resistors of arcing devices		The measured resistance values must correspond to the factory data with the tolerances indicated in them.	-
3) EMU windings		Must match factory specifications	-
10.6. Checking the movement time of the moving parts of the circuit breaker	К	The obtained values of the time from the issuance of the command to the moment of closing (opening) of the contacts of the oil switches must correspond to the values \u16b\u3.1bspecified in Table. XNUMX (Annex XNUMX)	-
10.7. Measurement of the stroke of the movable part of the switch, pressing (stroke) of the contacts when turned on, control of the simultaneity of closing and opening the contacts	K, M	The values obtained must correspond to the values \u16b\u3.1bspecified in table. XNUMX(Annex XNUMX)	-
10.8. Checking the operation of the free release mechanism	K, M	The free trip mechanism must allow the opening operation to be carried out over the entire course of the contacts, i.e. at any time from the start of the power-on operation The free disengagement mechanism is tested in operation with the drive in the fully engaged position and in two or three intermediate positions.	It is allowed not to check the operation of the mechanism of free disengagement of drives PP-61 and PP-67 in intermediate positions due to the danger of a sharp return of the hand drive lever
10.9. Checking the adjustment and installation characteristics of the switch mechanisms	К	The check is carried out in the scope and according to the norms of the factory instructions and passports of each type of drive and circuit breaker drives	-
10.10. Undervoltage operation test	К	The minimum operating voltage of the tripping electromagnets of the oil circuit breaker drives must be at least 0,7 U_Mr. at DC and 0,65 U_Mr. with alternating current; closing electromagnets 0,85 U_Mr. at AC and 0,8 U_Mr. at direct current	The lowest actuation voltage of control electromagnets of circuit breakers with spring drives must be determined at the operating preload (load) of the closing springs in accordance with the instructions of the factory instructions
10.11. Testing the circuit breaker by repeated closing and opening	К	Switching on, off and complex cycles (V-O, O-V, O-V-O) during repeated testing must be carried out at the rated voltage at the terminals of the electromagnets Number of operations for each testing mode - (3 ± 5)	Two-, three-time testing in O-B and O-B-O cycles is carried out for circuit breakers intended for operation in the AR cycle
10.12. Testing transformer oil from circuit breaker tanks	K, M	Tank circuit breakers 110 kV and above: a) breakdown voltage - not less than 60 kV for 110 kV switches and not less than 65 kV for 220 kV switches b) the content of mechanical impurities - the absence Breakdown voltage of transformer oil of tank circuit breakers: for voltage up to 15 kV - 20 kV for voltage up to 35 kV - 25 kV	For tank (multi-volume) circuit breakers for a voltage of 110 kV and above, tests are carried out when they perform the maximum allowable number of switching (off and on) short-circuit currents or loads Oil from tank circuit breakers for voltages up to 35 kV and low-oil (low-volume) for all voltage classes after they have fulfilled the maximum allowable number of switching short-circuit currents or load currents is not subject to testing and must be replaced with fresh
10.13. Testing built-in current transformers	М	Produced in accordance with the instructions of paragraphs 20.1, 20.3.2, 20.5, 20.6, 20.7 section 20
10.14. Thermal imaging control	М	Produced in accordance with established standards and manufacturer's instructions

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