Suspension insulators critical flash is the insulation structure lightening impulse strength of suspension insulators. This is a normal attribute of the suspension insulator.

The total CFO voltages of polymer suspension insulators plus fiberglass poles have a linear relationship with the pole length. It is almost directly proportional to the pole length, regardless of the test condition and impulse polarity.

The insulation failure of a combined insulation structure was caused by either the surface flashover or breakdown in the air. These two discharge phenomena are associated with the breakdown in the gaseous dielectric. Therefore, the measured CFO voltages should conform to the principle of breakdown of the gaseous dielectric, in spite of the types of discharges occurring in the combined insulation structure. In a gaseous dielectric, the flashover voltage is higher for a negative lightening impulse than for a positive lightening impulse when it is broken down. This principle was validated in the conducted tests for 15 kV, 25 kV, and 35 kV polymer suspension insulators plus fiberglass poles.

The total CFO voltages of polymer suspension insulators critical flash under dry conditions are much higher than under wet conditions for the same impulse polarity and tested pole length because the insulation strengths of dielectrics are much lower in the wet conditions.

Suspension insulators critical flash is commonly used to describe the insulation structure lightening impulse strength.

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