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What is the proper procedure for field-testing PCORE bushings?

bushings field-testing pcore procedure
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What is the proper procedure for field-testing PCORE bushings?

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Before you make any measurements, you must determine the type of bushing that you are testing. All PCORE bushings are one of three types: A. POC (Paper-Oil-Core). PCORE POC bushings are constructed with oil-impregnated paper cores. PCORE POC bushing catalog numbers are from the following number series: 62XXX, 64XXX, 65XXX, 66XXX, 67XXX, 84XXX, 86XXX, 87XXX, 88XXX, and the latest 115kV-345kV designs start with the letters POC. B. PRC (Paper-Resin-Core). PCORE PRC bushings are constructed with an epoxy-impregnated paper core. PCORE PRC bushing catalog numbers are from the following number series: 63XXX, 81XXX, 82XXX, 83XXX, 85XXX, 89XXX. C. DRY-TYPE PCORE Dry-type bushings have very low capacitances. Performing a capacitance and power factor test on a dry-type bushing does not yield any meaningful information. The proper method for testing PCORE capacitance-graded bushings is by the UST (Ungrounded Specimen Test) method. This method is the ONLY acceptable method for testing bushings that

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