Selection of important parameters for zinc oxide arrester manufacturers

There are three most important parameters of zinc oxide arrester

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.

Let's take HY5WS-17/50 as an example to illustrate.

1. Rated voltage of zinc oxide arrester manufacturer

The 17 in the above model indicates the rated voltage. The definition of rated voltage is more complicated. As a non-professional manufacturer, it can be simply understood as the effective value of overvoltage reaches about 17kV, and the zinc oxide arrester will start to work. This parameter should not 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 real working value is still around 17. Therefore, the definition of the old national standard is very controversial, and it is no longer popularized. Therefore, whether the rated voltage is 17 or 16.5 or 17.5, it is actually the same performance level. They are all 17 products that meet the definition of the national standard. Don't dig out the words when buying. As for why there are things like 17.5 and 16.5, it is because the specific parameters of each manufacturer are slightly different, and the unique sales strategy of the model above.

2. The nominal residual voltage of the zinc oxide arrester manufacturer

The 50 in the above model represents the nominal residual voltage of lightning, which can be simply understood as when the most serious lightning strike occurs, the lightning arrester can at least limit the peak overvoltage below 50kV. This parameter is in fact the most important parameter of the arrester, because the basis of the insulation coordination of the entire system lies here. We continue to say that reducing the residual voltage is good because it reduces the residual voltage of the arrester, which is equivalent to improving the safety margin of all high-voltage electrical appliances in the system. However, reducing the residual voltage is limited by the performance of the zinc oxide resistor itself, which has a bottom line. Although products with gaps can further reduce the residual pressure, it is also not infinitely reduced, and there is also a bottom limit. If a small factory claims that the residual pressure of its products is lower than that of a regular large factory, it can basically be judged as messing around, and it doesn't matter if you don't buy it.

3. The energy absorption capacity of zinc oxide arresters and European cable joints

When the lightning arrester is working, due to the passage of kA-level high current, it will generate heat and increase 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 capacity is expressed in the form of kJ/kV; for domestic products, it is expressed in terms of square wave flow capacity A. The higher the value, the greater the current that the arrester can withstand without damage, and the better the performance. To put it bluntly, this ability is directly related to the diameter of the resistor. Just like when purchasing copper wires, the thicker the wire, the larger the current that can flow. When the formula is similar, the larger the resistor, the stronger the natural square wave current flow capacity.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbow connectors, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-shaped heads, wall bushings, European cable accessories, American cable connectors, transformer neutral point protection devices, fuses, isolation switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products