The residual voltage of a lightning arrester refers to the voltage drop across the valve resistor when the lightning current passes through the arrester. This is an important indicator for measuring the performance of a lightning arrester. The lower the residual voltage, the less overvoltage the arrester will have on the protected equipment when discharging the lightning current.
The impulse discharge voltage refers to the voltage when the insulating medium breaks down under the action of the impulse voltage. For a lightning arrester, the impulse discharge voltage determines whether it can operate in time under the lightning impulse and discharge the lightning current into the ground, thereby protecting the equipment from lightning damage.
There is a certain correlation between the residual voltage of a lightning arrester and the impulse discharge voltage. Generally speaking, the lower the impulse discharge voltage, the easier it is for the lightning arrester to operate under the lightning impulse, but this may also result in a relatively high residual voltage. On the contrary, if the impulse discharge voltage is set too high, although the residual voltage can be reduced, the lightning arrester may not be able to operate in time under the lightning impulse, thereby losing its protective function.
In actual applications, it is necessary to select a suitable lightning arrester based on the insulation level of the protected equipment and the characteristics of the lightning impulse. This requires that the residual voltage and impulse discharge voltage of the lightning arrester match the characteristics of the protected equipment to ensure that it can not only discharge the lightning current in time under the lightning impulse, but also limit the overvoltage on the protected equipment to a safe range.
The residual voltage and impulse discharge voltage of the lightning arrester are also affected by factors such as its internal structure, materials, and manufacturing process. Therefore, when designing and manufacturing the lightning arrester, these factors need to be considered comprehensively to ensure that its performance meets the use requirements.
With the development of the power system and the improvement of equipment protection requirements, higher requirements are also placed on the performance of the lightning arrester. This includes reducing the residual voltage, improving the stability of the impulse discharge voltage, and enhancing the lightning resistance level of the lightning arrester.
The relationship between the residual voltage and impulse discharge voltage of the lightning arrester and its impact on equipment protection are multifaceted. In practical applications, it is necessary to comprehensively consider various factors to select a suitable lightning arrester to ensure the safe and stable operation of the power system.
