Standard test method for dielectric breakdown voltage of insulating liquids using disk electrodes
A referee and a routine procedure for determining the dielectric breakdown voltage of insulating liquids are described that are applicable to liquid petroleum oils, hydrocarbons, and askarels commonly used as insulating and cooling mediums in cables, transformers, oil circuit breakers, and similar apparatus. The suitability of these procedures for testing liquids having viscosities exceeding 900cSt(mm/sup 2//s) at 40/sup 0/C (104/sup 0/F) has not been determined. The apparatus consisting of a test cup, electrodes, transformer, circuit-interrupting equipment, voltage-control equipment, and a voltmeter is described in detail. Voltage is applied to the liquid in the test cup and increased from zero at the rate of 3kV/s/sup + -/20% until breakdown occurs as indicated by operation of the circuit-interrupting equipment, and the voltage value is then recorded. The breakdown voltage is measured on five successive filling of the cup to ensure accuracy. (BLM)
- OSTI ID:
- 6922250
- Journal Information:
- Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 23; ISSN ASTSA
- Country of Publication:
- United States
- Language:
- English
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