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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

Complete switchgears for indoor and outdoor installation

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

Name of the test	Type of test	Test norms	Directions
22.1. Insulation resistance measurement:	K, M
1) primary circuits		The insulation resistance of fully assembled circuits must not be lower than the values given in Table. 15 (Annex 3.1)	Produced by a megohmmeter for a voltage of 2500 V
2) secondary circuits		Manufactured in accordance with Section 28	Produced by a megohmmeter for a voltage of 1000 V
22.2. Power frequency overvoltage test:	К
1) cell isolation		The test voltage of fully mounted cells is set according to those given in table. 5 (Appendix 3.1). Duration of application of test voltage for porcelain insulation - 1 min.; if the cell insulation contains elements of solid organic materials, the duration of application of the test voltage is 5 minutes.	All retractable elements with switches are installed in the working position (switches are on), retractable elements with power and instrument transformers, with arresters are rolled out to the control position. Power cables must be disconnected for the duration of the test.
2) isolation of secondary circuits		The test must be carried out in accordance with the instructions in section 28
22.3. Checking the alignment and entry of moving contacts into fixed ones	K, M	Contact misalignment should not exceed 4 - 5 mm. The vertical play of the lamellas of the disconnecting contacts of the withdrawable trolley must be within 8 - 14 mm. The entry of moving contacts into the fixed ones must be at least 15 mm, the power reserve is at least 2 mm
22.4. DC resistance measurement	К	The resistance of detachable contacts must comply with the instructions of the manufacturers, and in their absence, correspond to the data given in Table. 27 (Annex 3.1)	Produced selectively, if the design of KRU or KRUN allows, in secondary circuits - only for sliding type contacts
22.5. Busbar monitoring	М К	The control of the contact connections of the busbars must be carried out in accordance with the instructions in section 1
22.6. Mechanical Tests		Rolling out and rolling in of retractable elements is carried out four or five times. The alignment of the disconnecting contacts of the main circuit is checked, the operation of the shutter mechanism, interlocks, latches	-

Notes
1. Complete switchgears with SFXNUMX insulation are tested taking into account the instructions of the manufacturer.
2. Tests of KRU and KRUN devices (switches, instrument transformers, arresters, etc.) are carried out in accordance with the instructions of the relevant sections of these standards.

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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