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Prediction method of pre-breakdown time based on rdds parameter self-learning of circuit breaker

A technology of time prediction and circuit breaker, which is applied in the direction of circuits, electrical components, electric switches, etc., can solve the problems of failure to adjust the closing coefficient in real time, achieve the effects of suppressing transient impact, reducing the amount of calculation, and improving control accuracy

Active Publication Date: 2019-04-09
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage is that the closing coefficient of the actual closing operation may change due to the change of the insulation characteristics of the circuit breaker, and it has a certain degree of dispersion, and the closing coefficient cannot be adjusted in real time according to the result of the closing operation.

Method used

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  • Prediction method of pre-breakdown time based on rdds parameter self-learning of circuit breaker
  • Prediction method of pre-breakdown time based on rdds parameter self-learning of circuit breaker

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Embodiment 1

[0024] The pre-breakdown time prediction method based on the self-learning of the RDDS parameters of the circuit breaker is only illustrated by taking the single-phase closing operation as an example, and the prediction methods for other phases are similar, as shown in figure 1 shown. The sinusoidal waveform represents the voltage between the breaker breakers, which is usually selected as the system voltage on the power supply side of the breaker. The moment of sudden change in the feedback signal represents the electrical closing point of the breaker, and the auxiliary contact is a high-precision position contact with a fixed time difference from the closing time of the main breaker of the breaker. . It mainly includes the following steps:

[0025] (1) Through the result of the first closing operation, the phase α of the electrical closing point of the circuit breaker is obtained 1 , and phase β of the closing point of the main contact of the circuit breaker 1 , so as to c...

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Abstract

The invention discloses a pre-breakdown time prediction method based on circuit breaker RDDS parameter self-learning, and the method is characterized in that the method comprises the steps: obtainingcircuit breaker RDDS parameters based on the electrical switching point phase of a circuit breaker and the time difference between an electrical switching point and a main switching-on point; obtaining correction values of the circuit breaker RDDS parameters through multiple live-line switching operations, and calculating a pre-breakdown time prediction value based on the above according to a target switching phase. The method is simple and reliable, is small in calculation burden, and is very easy for software implementation in a control system. In a circuit breaker phase election switching control occasion, the pre-breakdown time is calculated and considered in advance, thereby facilitating the improvement of the switching-on phase control precision, and effectively inhibiting the transient impact when the power system switch is switched on.

Description

technical field [0001] The invention relates to the technical field of power grid circuit breakers, in particular to a method for predicting pre-breakdown time based on self-study of RDDS characteristic parameters during phase-fixed closing control of circuit breakers. Background technique [0002] In the power system, the transient process of switch closing operation will produce inrush current and overvoltage, which is not conducive to the stability of the system. A large number of field application experience shows that the use of phase selection closing can effectively reduce the impact on the system at the moment of closing, but in the process of phase selection closing, there will always be a gap between the actual closing phase angle and the set target closing phase angle. There is a certain deviation, which is related to the dispersion of the inherent mechanical closing time of the circuit breaker, and the influence of the pre-breakdown characteristic will bring abou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/56
CPCH01H9/56H01H2009/566
Inventor 李海涛须雷刘东超刘鹏卢为陈志刚
Owner NR ELECTRIC CO LTD
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