The selection of the surge protector should be selected according to the specific parameters of the protected line, the equipment and the specific needs of the customer. So, what factors should the surge protector refer to when selecting a specific type? Now, GADA gives you a detailed introduction:
First, the choice of the maximum continuous working voltage value
The maximum continuous operating voltage of the surge protector is a key parameter related to the stability of the surge protector. When selecting the maximum continuous operating voltage value of the surge protector, in addition to meeting the relevant standards, the normal fluctuations that may occur in the installed grid and the highest continuous fault voltage that may occur should also be considered.
Second, the choice of residual pressure
Simply consider that the residual voltage of the surge protector is as low as possible. This is not comprehensive and can be misleading. The residual voltage values claimed by different products must indicate the magnitude and waveform of the test current in order to have a basis for common comparison. The residual pressure is typically recorded as a comparison with a 20 kA test current.
Second, the lower the residual voltage for a varistor surge protector, the lower the maximum sustainable operating voltage. Therefore, over-emphasis on low residual voltage is at the expense of reducing the maximum continuous operating voltage.