Valve arresters and surge arresters

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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

Valve arresters and surge arresters

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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
17.1. Resistance measurement of arresters and surge suppressors	М	The resistance of surge suppressors with a rated voltage of less than 3 kV must be at least 1000 MΩ. The resistance of surge suppressors with a rated voltage of 3 - 35 kV must comply with the requirements of the manufacturers. The resistance of surge suppressors with a rated voltage of 110 kV and above must be at least 3000 MOhm and should not differ by more than ± 30% from the data given in the passport or obtained from previous measurements in operation. The resistance of arresters RVN, RVP, RVO, GZ must be at least 1000 MOhm. The resistance of the elements of the RVS arresters must comply with the requirements of the factory instructions, and the elements of the RVM, RVRD, RVMG arresters - specified in the table. 22 (Appendix 3.1)	Measurements are taken during scheduled repairs of equipment to which protective devices are connected, but at least once every 6 years For arresters and arresters with a rated voltage of 3 kV and above, measurements are made with a megohmmeter for a voltage of 2500 V, for arresters and arresters with a rated voltage of less than 3 kV - with a megohmmeter for a voltage of 1000 V
17.2. Measuring the insulation resistance of insulating bases of arresters with response recorders	М	Insulation resistance must be at least 1 MΩ	Measured with a megaohmmeter for a voltage of 1000 - 2500 V
17.3. Measurement of conduction current of valve arresters with rectified voltage	М	The conduction current values of valve arresters must correspond to those specified by the manufacturer or given in the table. 23	Extraordinary measurement of conduction current is carried out when the resistance of the above in paragraph 17.1 changes
17.4. Conduction current measurement of surge arresters	М	The conduction current values of the arrester must correspond to those specified by the manufacturer or given in the table. 24 (Appendix 3.1)	During operation, for 110 and 220 kV limiters, it is recommended to carry out measurements without disconnecting from the network annually before the thunderstorm season according to the manufacturer’s methods
17.5. Checking the elements included in the set of devices for measuring the conduction current of limiters under operating voltage		Produced in accordance with the manufacturer's instructions
17.6. Measuring the breakdown voltage of valve arresters at power frequency	К	The measured breakdown voltages may differ from the manufacturer's data by +5 - -10% or must correspond to those given in the table. 25(Appendix 3.1)	Measurement is carried out only after repair with opening of the arrester according to the manufacturer’s method by specially trained personnel in the presence of an installation that ensures that the voltage application time is limited
17.7. Checking the tightness of the arrester	К	The change in pressure with the valve closed for 1 - 2 hours should not exceed 0,07 kPa (0,5 mm Hg)	Performed only after repair with opening of the arrester at a vacuum of 40 - 50 kPa (300 - 400 mm Hg)
17.8. Thermal imaging control	М	Produced in accordance with established standards and manufacturer's instructions

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