01 Basic principlesThe relay protection device must have the function of correctly distinguishing whether the protected component is in normal operation or has a fault, and whether it is a fault within the protection zone or a fault outside the zone. To achieve this function, the protection de
Danger of short circuit in power transformer1. Impact of surge current: A sudden short-circuit of the transformer will produce a large short-circuit current. Although the duration is short, this hidden danger may have already formed before the main circuit of the transformer is cut off. After the fo
1. Voltage problemReason: High voltage will cause the transformer to be over-excited and the sound will become louder and sharper, which will directly seriously affect the noise of the transformer.Judgment method: First look at the low-voltage output voltage. Do not look at the voltmeter on the low-
0 1Classification of secondary circuitsThere are different types and categories of electrical secondary circuits, but generally they can be divided into three types.The first type is mainly classified according to the purpose of the electrical secondary circuit, which can be divided into principle-b
1. Abnormal noise occurs inside the transformer.Abnormal noises inside the transformer may be due to the following reasons:a. Severe overload causes a heavy "buzzing" sound inside the transformer;b. Due to poor internal contact or breakdown points, "squeaking" or "crackling&
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