Impact surge current positioning method

Abstract

The invention discloses an impact surge current positioning method, and the method comprises the steps: determining the propagation velocity V of an electromagnetic wave in the ground; establishing at least three earth surface potential observation points, analyzing the time domain waveform of the scalar potential of the earth surface potential observation points caused by the impact current, and obtaining the time difference from the time domain waveform; performing positioning based on animpact surge time difference method,wherein the time for the electromagnetic waves to reach the surface potential detection station is as follows: the distance difference between the electromagnetic waves generated at the position of the earth current and different surface potential observation points is a constant value; and determining two hyperbolic curves among every three earth surface potential observation points, wherein the intersection position of the two hyperbolic curves determines the position of an impact current inflow point, and the average value of the positions of the impact current inflow point is the final position of the impact current inflow point.

Description

technical field [0001] The invention belongs to the field of locating underground stray current sources, in particular to a locating method for impact surge currents. Background technique [0002] The magnetic bias phenomenon is an abnormal working state of the transformer, which means that a DC or transient component appears in the excitation current of the transformer, and half-wave saturation occurs. When transformer bias occurs, the excitation current of the transformer will generate a large number of harmonics. The generation of harmonics will cause problems such as temperature rise, vibration and noise in the transformer. In addition, the transformer bias will also affect relay protection equipment, capacitor banks, and current mutual inductance. The normal operation of devices such as devices. There are many reasons for the transient component current flowing into the neutral point of the transformer, which can be mainly divided into two aspects. On the one hand, th...

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Problems solved by technology

At the same time, the leakage flux of the transformer becomes larger, and the increase of reactive power loss leads to a serious drop in the voltage of the power system, and the relay protection device of the system will also appear abnormal actions

The increased leakage flux will also increase the eddy current loss of the transformer, which will seriously affect the insulation of the body and even the service life of the transformer

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