The main parameters and damaged varistor form

ZnO varistor is a zinc oxide as the main component of the metal oxide semiconductor non-linear resistance element; resistance to voltage sensitive, when the voltage reaches a certain value, the resistance quickly turned. Since the varistor has a good non-linear characteristics, through traffic, low residual voltage levels, fast action and free wheeling characteristics. It is widely used in electronic equipment, lightning protection.
The main parameters:
1, residual voltage: the highest peak occurring in the varistor voltage high current waveform by specifying its ends.
2, flow capacity: After a predetermined time interval and applying a predetermined frequency waveform current in the varistor, the maximum current amplitude variation was still varistor reference voltage within the specified range can pass through.
3, the leakage current: the role of the reference voltage, the current flowing in the varistor.
4, rated working voltage: allow long-term continuous work across the varistor frequency RMS voltage is applied. The TGE mov metal oxide varistor transient overvoltage energy absorption after their own temperature, at this voltage normal cooling, no heat damage.
Lack of varistors: (1) a large parasitic capacitance varistor having a large parasitic capacitance, typically a few hundred to several thousand pF range. In the high-frequency signal system can cause high-frequency signal transmission distortion, causing the system to normal operation. (2) the presence of the varistor leakage current leakage current index is not only related to the normal operation of the protection of electronic systems, but also related to the varistor aging and life itself.
Varistor damage in the form of: (1) When the varistor suppression of transient over-voltage energy greater than its rated capacity, the TGE Varistor for counter will damage due to overheating, mainly for shorts, opens.