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Measurement methods:
Measure the glass porcelain insulators resistance for the insulator of the single element, only in the case of power outage, the relevant procedures specified in, using 2500V and above megger. More 2500V and 5000V megger voltage higher specialized instruments. But in fact, less than 1 * 104MΩ, a same precision 2500V and 5000V megger under the same humidity, the measured insulation resistance is substantially the same. The measured insulation resistance of greater than 1 * 104MΩ 2500V megger can not be read out accurately the insulation resistance values​​, and count only ∞. 5000 megger desirable maximum insulation resistance of up to 2 * 105MΩ.
Blackout, for multi-element composition of the insulator can also be energized to measure the insulation resistance. The method is the high resistance connected to a charged insulator, megger is at ground potential of the measurement of the insulation resistance, a high resistance value is subtracted from the measured insulation resistance, the insulation resistance value of the measured insulator. Charged the principle of measuring the insulation resistance of the insulator wiring is shown in Figure 4-1. Figure 4-1, R is the resistance, the resistance in the high-resistance rod 10 ~ 20kΩ / V, length 0.5 ~ 105kV/cm choice, capacity per unit resistors l ~~ 2W; C grounded capacitance, can megabytes ohm meter is at ground potential, and C of the insulation resistance should be achieved the megger most a large number of constraints, to ensure the accuracy of the measurement. The electrical capacity of C of 0.01 ~ 0.05μF, should be able to withstand a DC voltage of 3000V or more. 5. Judgment
(1) each element of the pin post porcelain insulators and every piece of suspension insulator resistance should not be less than 300MΩ.
(2) 500kV suspension insulator insulation resistance of not less than 500MΩ.