Bushings and bushings

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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

Bushings and bushings

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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
9.1. Insulation resistance measurement d	K, M	Not less than 500 MΩ	The resistance of the main insulation of the measuring and last linings of the bushings with paper-oil insulation is measured relative to the connecting sleeve. The measurement is made with a megohmmeter for a voltage of 2500 V
9.2. Measurement of dielectric loss tangent (tgδ) and insulation capacitance	K, M	See table. 14 (Appendix 3.1). The capacitance limit of the basic insulation is 5% of the value measured during commissioning The measurement of tgδ and the capacitance of the main insulation is carried out at a voltage of 10 kV, the insulation of the measuring capacitor (C₂) and (or) the last layers of insulation (C₃) at a voltage of 5 kV	Produced for bushings and bushings with basic paper-oil, paper-bakelite and paper-epoxy insulation Measurement of tgδ for bushings with oil barrier insulation is not necessary
9.3. Power frequency surge test	K, M	See table. 5 (Appendix 3.1). The inputs installed on power transformers are tested together with the windings of these transformers	The duration of the test voltage application for bushings tested together with transformer windings, as well as for bushings with basic porcelain insulation - 1 min., for bushings and insulators made of organic solid materials and cable masses - 5 min.
9.4. Checking the quality of bushing seals	К	It is produced at oil-filled leaky bushings with oil-paper insulation for voltage of 110 kV and higher by creating an excess oil pressure of 0,1 MPa in them. Test duration - 30 min.	During the test, there should be no signs of oil leakage and a decrease in test pressure. It is allowed to reduce the pressure during the test no more than 5 kPa
9.5. Testing transformer oil from oil-filled bushings	K, M	See table. 6 (Annex 3.1)
9.6. Pressure gauge check	М	Pressure gauges of hermetic bushings are checked by comparing their readings with those of a certified pressure gauge. Permissible deviation of the pressure gauge readings from the certified one is not more than 10% of the upper limit of measurements	The check is performed at three digitized points on the scale: beginning, middle and end
9.7. Thermal imaging control	М	Produced in accordance with established standards and manufacturer's instructions

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