MOV Block for Distribution Arrester

TGE developed D36 & D42 series glass coating MOV which be suitable for
distribution arresters according to IEC60099-4 (2014) in 2018. Based on the
proven technique of high-performance metal oxide varistor, a special new type
of metal oxide varistor can be used in heavy-duty distribution arresters has
been successfully developed recently by TGE for the purpose of optimization of
the electrical and economic performance of the new MOV with a diameter of 36mm
& 42mm, that signifies not only its electrical performance meets the
requirements, but also it can be led to cost reduction of zov varistor by means
of smaller arrester dimension.

MOV Block for Distribution Arrester Advantages

1
Excellent performance in the high current test: TOV reached 1.25Ur and 1s was
higher than the standard 1.2Ur and 0.1s.
2
Higher protection level: TOV reached 1.25Ur and 1s was higher than the standard
1.2Ur and 0.1s.
3
High performance in 8/20µs charge test: Ures change is within 3% and Ures
change is within 1% after Qrs 0.4C charge test with 8/20µs waveshape for TGE
D36.
4
High performance in short circuit test: TGE wound core for customer passed 16kA
short circuit test.
5
Stable aging performance.
6
High energy absorption capability.

How Does MOV Block for Distribution Arrester Work?

First of all, the stability of the electrical parameters of MOV under
continuous operating voltage.
The artificial accelerated aging test proves that in the life cycle of the MOV,
its power consumption shows a declining trend with time. This means that in the
long-term operation of the MOV or arrester, the power consumption or heat
generated by itself will not gradually increase, so the MOV or arrester is in a
stable state. On the other hand, when the MOV or arrester is subjected to
continuous operating voltage for a long time, the influence of the change in
ambient temperature on the power consumption or resistive current of the MOV is
also a factor that affects the operational stability of the MOV or arrester.
Since the power consumption or resistive current of the zov mov has a positive
temperature coefficient, anyway, as the temperature increases, the power
consumption or resistive current will show an increasing trend. But in spite of
this, the improvement of manufacturing technology can make the change of power
consumption or resistive current with temperature as small as possible, which
is conducive to the safe operation of the arrester. The figure shows that the
aging characteristics of the D36& D42 series MOVs show that the power
consumption increases monotonously as the application increases. The figure
shows the change in power consumption of the MOV at different temperatures.
Especially at a temperature of 190 ° C, the power consumption of the MOV sheet
remains low. This is particularly important for the design of lightning
arresters. When operating load or TOV test, the temperature rise of the MOV is
very high due to the large energy absorbed by the MOV, and only when the high
temperature power consumption remains low, it is
Specification of special metal oxide varistor for heavy duty distribution
arrester easier to reach the heat under the recovery voltage or MCOV voltage
stable. After the surge arrester in operation absorbs overvoltage energy, due
to the lower high-temperature power consumption of the MOV, the heat generation
of the surge arrester is lower, which is more conducive to the safe operation
of the surge arrester

Secondly, the stability of the electrical parameters of the MOV sheet after
being subjected to different pulse currents. The most obvious characteristic of
the MOV after undergoing a large pulse current and absorbing the corresponding
energy is that the temperature rise and the reference voltage leakage current
or power consumption and residual voltage after cooling have a certain
amplitude change from the value before the pulse current.

For more information about metal oxide varistor symbol, please feel free to
contact us!

Minimum Order: 3000 pieces

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