Detection of AC gapless oxide surge arrester-Testing fee, test mark certification, test knowledge inquiry

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Detection of AC gapless oxide surge arrester

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Detection of AC gapless oxide surge arrester

The function of lightning arrester: When lightning overvoltage invades the substation or other buildings along the overhead line, it will cause flashover and even break down the insulation of electrical equipment. Therefore, if a protective device, namely a lightning arrester, is connected in parallel at the power input terminal of electrical equipment, when the overvoltage value reaches the specified operating voltage, the lightning arrester will immediately act, flow charges, limit the overvoltage amplitude, and protect the insulation of the equipment; After the voltage value is normal, the lightning arrester quickly returns to its original state to ensure the normal power supply of the system The prerequisite for the protective effect of a lightning arrester is:

1. The characteristics match well with the characteristics of the protected insulation

2. Ensure that its residual voltage is lower than the impact electrical strength of the protected insulation

3. The protected equipment must be within the protection range of the lightning arrester

Parameters of the lightning arrester:

1. Continuous operating voltage: voltage that allows long-term operation 2. Rated voltage (kV): The maximum power frequency voltage allowed for short time. The lightning arrester can discharge and extinguish the arc at this power frequency voltage, but it cannot operate for a long time at this voltage 3. Power frequency withstand voltage second characteristic: indicates the ability of zinc oxide lightning arrester to withstand overvoltage under specified conditions 4. Nominal discharge current (kA): The peak discharge current of the lightning arrester level The classification and structure of lightning arresters are commonly used, including valve type lightning arresters, tube type lightning arresters, protective gap lightning arresters, and metal oxide lightning arresters

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