The continuous operating voltage of the lightning arrester is basically equivalent to the maximum phase voltage of the system, but for systems where the neutral point is not directly grounded, the continuous operating voltage of the lightning arrester must be greater than the maximum relative to ground rated power frequency voltage during the fault period.   Due to the absence of gaps in zinc oxide lightning arresters, the power frequency voltage of the grid is constantly applied to them. The continuous effect of this voltage may cause aging of zinc oxide products. Therefore, in the testing of lightning arresters, when the dangerous overvoltage has passed, the rated voltage is used to simulate a temporary overvoltage applied to the lightning arrester for 10 seconds (this time is determined by the action time of the circuit breaker connected to the grid, and in ultra-high voltage systems, even considering the action of backup relay protection, it does not exceed 1 second). This is not enough because after the temporary overvoltage, the lightning arrester also has to withstand the operating voltage of the system. At this time, the continuous operating voltage is used to simulate the maximum operating phase voltage of the system, that is, the maximum operating line voltage of the system. The voltage is divided by the root 3, and the pressurization time is 30 minutes, Then observe whether the temperature of the lightning arrester decreases or continues to rise, causing thermal collapse. So in a sense, the rated voltage and continuous operating voltage of lightning arresters have great significance in testing but little significance in operation. To illustrate this point, let's take another example. In I E. In the C standard and national standards, accelerated aging tests must be conducted on lightning arresters because zinc oxide lightning arresters are connected to the power grid for a long time and continuously withstand the voltage of the grid, so the product may age. The aging of the product when connected to the actual power grid is natural aging. If we consider that the normal operating time of a certain lightning arrester in the power grid is 100 years, and if we use natural aging methods, we have to wait for 100 years. This kind of waiting is unbearable for the development of any new product, so artificial accelerated aging tests must be conducted. That is, under human factors, a period of time (of course not too short) is used to accelerate the aging of the product, and then this period of time is equivalent to the natural aging time. In the accelerated aging test of lightning arresters, the first step is to apply voltage, which requires the application of a continuous operating voltage for 1000 hours (approximately 42 days). If the surface temperature of the zinc oxide valve plate can be maintained at 115 ± 4 ° C continuously; Within the range of C, it is believed that the lightning arrester can operate for 100 years under continuous operating voltage, which is the effect of artificial accelerated aging. It links the artificial pressurization time of 1000 hours with the natural pressurization time of 100 years, greatly improving efficiency. It can be said that without artificial accelerated aging, there are almost no electrical equipment. Of course, as for whether it can be equivalent in this way, countries are still conducting further research