Mov for line discharge

 Варисторы оксидно-цинковые Movs manufacturer Arresters which used TGEMOV have below advantages: --With the same referencevoltage, hold more excellent protective characteristics; --With the same protectionlevel, arrester have higher reference voltage andcontinuous operating voltage. Therefore, arrester could withstandlower electric stress and for safe operation.

metal oxide varistor basics metal oxide varistor theory

Basic Specification

type: metal oxide varistors/ Blocks

size: diameter38mm, height 29mm

coating: organic coating and glass coating

rated voltage: 4.5kV

craft: metal oxide

package type: wooden cases and carton

NDC:5kA

Description

DC U1mA voltage is 6.38+0.3kV

Reference current is 1mA

Reference voltage is 6.38kV

Residual voltage is 11.5+0.5kV

Long duration current is 400A

Nominal discharge current is 10kA

Applications:

Used for distribution arresters.

Arresters which used TGE MOV have below advantages:

--With the same referencevoltage, hold more excellent protective characteristics;

--With the same protectionlevel, arrester have higher reference voltage andcontinuous operating voltage. Therefore, arrester could withstandlower electric stress and for safe operation.

Варисторы оксидно-цинковые

metal oxide varistor basics 

metal oxide varistor theory

The basic properties of metal oxide blocks

(1) metal oxide blocks has protection feature, when the impact of the strong impact of the source does not exceed a predetermined value, the varistor voltage limit must not exceed the protected object can withstand voltage shock resistance.
(2) the impact resistance, the varistor itself should be able to withstand the impact of current, impact energy, and several attacks have appeared when the average power.
(3) There are two characteristics of life, one continuous working voltage life, namely varistor specified ambient temperature and system voltage conditions should be able to work reliably specified time. Second, the impact of life, that is able to reliably withstand the impact of a predetermined number of times.
(4) After the metal oxide varistor basics intervention system, in addition to protect a "safety valve", it will also bring some additional impact, which is the so-called "secondary effects", it should not reduce the normal performance of the system. Then the main factors to be considered, there are three, one varistor own capacity, the second is the system voltage, leakage current, the third is non-linear current through the varistor coupled source impedance effects on other circuits.

The note of ZnO Resistors

Temperature fuse ZnO Resistors should have good thermal coupling when varistors fail (high-impedance short circuit), the heat it generates the temperature fuse fuse, varistor and separation circuit failure to ensure that the equipment Safety. When a high frequency temporary over-voltage applied to the varistor , the varistor may cause momentary short-circuit breakdown (low impedance short circuit), the temperature fuse fuse had a chance, but also may cause fire. To avoid this phenomenon may be further connected in series to each varistor fuse a high impact frequency (single frequency fuse employment at the time of aging failure may not fuse)