With the advent of summer, thunderstorm weather is constantly appearing. Because of the strong lightning impact on the induced current of dry-type transformer, it seriously interferes with the electromagnetic wave generated by dry-type transformer, which makes the operation and operation of dry-type transformer deviate, which may lead to lightning strike Can work, the risk of short circuit is relatively large. Therefore, the dry-type transformer should be prevented from being struck by lightning in summer. For dry-type transformer, what are the common measures and methods to prevent lightning strike in summer? The following Liwang Electric will introduce in detail:
Qualified arresters must be installed at the high and low voltage sides of dry-type transformer according to the specified requirements, so as to reduce the harm of lightning overvoltage and Ferromagnetic Resonance Overvoltage on the high and low voltage coils or bushing of dry-type transformer. The main reasons are as follows: first, the installation test of lightning arrester does not meet the requirements. Generally, three arresters are installed with only one point of grounding. In long-term operation, serious corrosion is caused by long-term disrepair, wind and rain, climate change and other special conditions, which cause disconnection or poor contact of the grounding point. In case of lightning overvoltage or system In case of resonance over-voltage, the dry-type transformer is broken down because it can not discharge and depressurize the earth in time; Second, most dry-type transformers are insured by insurance companies, which results in paying more attention to insurance company compensation and neglecting maintenance management. Some users think that if dry-type transformers are insured, it doesn't matter whether the arrester is installed or tested. Anyway, if the dry-type transformer is damaged, the insurance company is responsible for the compensation, which is also an important factor for the serious damage of dry-type transformer over the years; Third, only pay attention to the installation test of high-voltage side arrester of dry-type transformer, but despise the installation test of low-voltage side arrester. Because the low-voltage side of dry-type transformer is not installed with lightning arrester, when the low-voltage side of dry-type transformer is struck by lightning, the low-voltage side coil may be damaged.
Dry type transformer is constantly generating induced current. When the induced current encounters the current generated by lightning, it will cause the induced current to be affected, resulting in thunderstorm, which will damage the dry-type transformer and affect the normal function. Sometimes it will be dangerous. Therefore, it is necessary to master the methods to prevent lightning stroke!
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