There are three most important parameters for zinc oxide arresters
One is the rated voltage of the zinc oxide arrester, the other is the nominal residual voltage of the zinc oxide arrester, and the other is the energy absorption capacity of the zinc oxide arrester.
The following takes HY5WS-17/50 as an example to illustrate.
1. Rated voltage of zinc oxide arrester, arrester manufacturer
The 17 in the above model indicates the rated voltage. The definition of rated voltage is relatively complicated. As a non-professional manufacturing personnel, it can be simply understood as when the effective value of overvoltage reaches about 17kV, the zinc oxide arrester will start to work. This parameter cannot be too low, otherwise it will easily cause the zinc oxide arrester to be overburdened and burned. Although the old national standard defines the rated voltage as 12.7, the actual working value is still around 17.
So whether the rated voltage is 17 or 16.5 or 17.5, they are actually the same performance level. They are all category 17 products that meet the national standard definition. Don’t be confused by the words when purchasing. As for why there are such things as 17.5 and 16.5, it is because the specific parameters of each manufacturer have slight differences, and the sales strategy needs of the unique model shown above.
2. Nominal residual voltage of zinc oxide arrester, European cable joint
The 50 in the above model represents the nominal residual voltage of lightning, which can be simply understood as when the most severe lightning strike occurs, the arrester can at least limit the overvoltage peak to below 50kV. This parameter is actually the most important parameter of the arrester, because the basis of the insulation coordination of the entire system lies here. We keep saying that reducing the residual voltage is good because reducing the residual voltage of the arrester also increases the safety factor of all high-voltage electrical appliances in the system.
However, reducing the residual voltage is limited by the performance of the zinc oxide resistor sheet itself, and there is a limit. Although products with gaps can further reduce the residual pressure, the reduction is not infinite and there is also a limit. If a small factory claims that the residual pressure of its products is lower than that of regular large manufacturers, it can basically be judged as messing around, so don't buy it.
3. Energy absorption capacity of zinc oxide arrester, cold shrink cable terminal
When the arrester is working, due to the passage of kA-level high current, it will heat up significantly. If it cannot withstand it, it will cause damage or even explosion. Therefore, the energy absorption capacity of the arrester is a very important parameter. For export-oriented products, this capability is expressed in terms of kJ/kV; for domestic products, this capability is expressed in terms of square wave flow capacity, A. The higher the value, the greater the current the arrester can withstand without being damaged, and the better its performance.
Yichang Hengyuan Technology Co., Ltd. specializes in the production of European-style cable joints, plug-and-pull heads, cable branch boxes, American-style elbow joints, high-voltage vacuum circuit breakers, high-voltage load switches, arresters, zinc oxide arresters, tank arresters, over-voltage protectors, counters, monitors, heat-shrinkable cable accessories, Manufacturer of cold shrink cable accessories, T-heads, wall bushings, European cable accessories, American cable joints, transformer neutral point protection devices, fuses, isolating switches, PT cable heads, elbow cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products
