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Prevention of harmonic overload and fire hazard in electrical circuits

2013-09-17
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In recent years, we often have such experience in life - the circuit breaker trips more frequently, but when the clamp meter is used to measure the loop current, it is found that the current does not exceed the setting value of the circuit breaker. It turns out that this is the circuit overload caused by harmonic current that causes the circuit breaker to trip. With the continuous improvement of my country\'s electricity consumption level, various new electrical appliances have entered industrial and commercial buildings and residences in large quantities. Many of these electrical appliances are non-linear loads. They can generate high-order harmonics of various orders, which can cause transformers, motors, etc. to heat up and reduce their output rate. They can also cause the circuit to overload and heat, and the circuit breaker to trip frequently, and even cause fires. Harmonics can be generated inside electrical devices or from public power grids polluted by other users. It can not only harm the electrical device itself, but also harm other users through the conduction of the power grid. This article only intends to discuss the circuit overload problem and fire hazard caused by harmonics.

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