In the normal use of the terminal, often subjected to overvoltage arising from the impact of the problem, the overvoltage in electric power system is a kind of electromagnetic disturbance phenomena. Insulation tolerance with working voltage electrical equipment, but also must be able to withstand overvoltage amplitude, so as to ensure the safe and reliable operation of power system. Four common classification below Elinker Electric overvoltage list, hope helpful to use the business of terminal.

Over voltage grade Ⅰ to Ⅳ applicable situation:

1, a voltage level by using voltage in the unlikely ever to Ⅰ device only instruments or the use of surge arresters, filters or capacitors on the overvoltage suppression equipment.
Note: devices that voltage level for safe low voltage drive.

2, overvoltage category II device only can be used in high pressure without lightning threat equipment in cases such as home appliance belongs to a voltage level.

3, overvoltage category III devices apply only to no lightning high threat of instruments and equipment, but to take into account security devices and related power system and trouble free operation must put forward special requirements on the device. Produced by the device itself over voltage does not exceed the overvoltage level II value.
Note: the device is fixed, such as protection device, click protection relay, switch socket belong to a voltage level.

4, overvoltage category IV device can be used for receiving equipment flashover voltage of threat, produced by the device itself over voltage does not exceed voltage grade II value.

In view of this situation, should be born of over-voltage surge protection of terminal, terminal applied to possible over voltage of power, overvoltage with over voltage protection function of electronic equipment in the generator, the normal work of the system can be viewed as switch off shunt did not produce any effect in the electric heater in. Once the overvoltage, they will be in the parameters do not exceed arrester set the premise, and the short time inside the electrical short circuit, short circuit and overvoltage lasting time of time related. The transient voltage to the electronic equipment is not a dangerous level, the electronic devices are protected.