metal oxide varister

Innovative elements: Zinc Oxide blocks for high performance requirements, system studies functional powder type, size, density, surface condition, surface treatment, surface area and powder activity of the influence of the resistance properties, the successful development of sensitive resistance high-performance composite particles. The product is uniformly mixed with zinc oxide, after pressing and sintering can effectively improve the performance of varistors, reached the advanced level of developed countries today.
Benefit Analysis: Zinc Oxide discs and surge arresters have important applications in the field of transmission and distribution engineering and construction of power grids, subway rail transportation, military and civilian communications facilities, the development of high performance metal oxide varister and surge arresters is significant .

High Performance Varistor

High Performance Varistor and surge arrester varistor high performance requirements, system studies functional powder type, size, density, surface condition, surface treatment, surface area and powder activity of the influence of the resistance performance, success develop efficient varistor composite particles.
Second, the specific description:
1. Application: metal oxide varistors and surge arresters manufacturing enterprises.
2, the technical indicators: application to high-performance anti-corona resistance, surge voltage insulation coating material, its performance over similar foreign products; applied to large current insulating coating material, such as zinc oxide insulating layer side valve D3 with ordinary Composite arrester valve side insulation coating compared to the 4 / 10μs standard indicators of the impact of high current 65 ~ 70kA, more than GB11032-2000 standard (45kA), and reached the international IEC-60099-4 standard (65kA).

添加图片说明

Varistor is a voltage

Varistor is a voltage limiting protection devices. Nonlinear characteristic use varistors, when an overvoltage occurs between two poles varistor varistor voltage can be clamped to a relatively fixed voltage value, metal oxide arrester in order to achieve protection of the post-stage circuit. The main parameters of mov metal oxide varistor are: varistor voltage, current capacity, junction capacitance and response time.

mov metal oxide varistor

TGE Mov varistor is a non-linear voltage characteristics of the resistance of the device is mainly used in the voltage clamp circuit withstand over-voltage, absorbing excess current to protect sensitive devices. English name called "Voltage Dependent Resistor" abbreviated as "VDR", or called  mov varistor. Varistor resistive material is a semiconductor, so it is a variety of semiconductor resistor. "Zinc oxide" Now a lot of use of (ZnO) varistor metal oxide, its main material divalent element zinc (Zn) and hexavalent elemental oxygen (O) of the composition. So from the point of view of materials, the zinc oxide  High voltage varistor is a "Ⅱ-Ⅵ family-oxide semiconductor." In China Taiwan, varistors called "surge absorber", sometimes also referred to as "electric shocks (surge) suppressor (absorber)."

添加图片说明

Varistor in parallel:

When a TGE mov varistor for counter nominal discharge current can not meet the requirements, it should be used in parallel with multiple varistors. Sometimes in order to reduce the limit voltage, even if the nominal discharge current to meet the requirements adopted
A plurality of mov metal oxide varistor in parallel. Pay particular attention to that when the TGE metal oxide varistor theory in parallel, must be consistent with carefully selected parameters (for example: ΔU1mA≤3V, Δα≤3) paired to
To ensure uniform distribution of current

The nominal discharge current calculation:

TGE mov varistor nominal discharge current should be greater than required to withstand inrush current or potential annual maximum surge current. The nominal discharge current should be fixed TGE MOV surge life count curve
More than 10 times the value of impact is calculated about 30% maximum impact through traffic (ie 0.3 IP) around

Varistor resistive material is a semiconductor

TGE metal oxide varistor symbol resistive material is a semiconductor, so it is a variety of semiconductor resistor. "Zinc oxide" Now a lot of use of (ZnO) varistor, it has two main material
Price element (Zn) and hexavalent elemental oxygen (O) of the composition. So from the point of view of materials, the zinc oxide metal oxide varistor basics is a "Ⅱ-Ⅵ family-oxide semiconductor."
Varistor protection, the vast majority of applications, it can repeatedly effect, but sometimes also to make it into the current fuse as a "one-off" protection device. For example, and then
On some of the short-circuit current transformer load contacts varistors. The most important feature of the TGE varistor metal oxide is added on top of it when voltage drops below its threshold "UN" when the current flowing through it is extremely small, phase
When in a shut valve, when the voltage exceeds the UN, the surge current flowing through it, is equivalent to the valve open. Using this feature, you can suppress the circuit often appear abnormal over-voltage protection
Protect circuitry from overvoltage damage.