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&
Power grid harmonic pollutionWhen a sine wave voltage is applied to a nonlinear load, the current becomes a non-sinusoidal wave, and the non-sinusoidal current causes a voltage drop on the grid impedance.The voltage waveform will also become a non-sinusoidal wave. Perform Fourier series decompositio
Generator excitationThe generator excitation system is the collective name for the power supply and its ancillary equipment that supplies the excitation current of the synchronous generator. It generally consists of two main parts: excitation power unit and excitation regulator.Generator excitation
I. IntroductionWith the rapid development of power systems and the advancement of computer technology and communication technology, relay protection is further developing rapidly in the direction of computerization, networking, integration of protection, measurement, control, data communication and
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