Probably 80% of all testing performed in electrical power systems is related to the verification of insulation quality. This Technical Bulletin briefly describes the fundamental concepts of insulation testing including: insulation behavior, types of tests, and some test procedures.
AC or DC
Most electrical equipment in utility, industrial, and commercial power systems uses either 50 or 60 Hz alternating current. Because of this, the use of an alternating current source to test insulation would appear to the logical choice. However, as will be described a little later, insulation systems are extremely capacitive. For this reason, DC has found a large niche in the technology.
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