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Prediction method for current-carrying fault of circuit breaker

A fault prediction and circuit breaker technology, applied in circuit breaker testing, instrumentation, heat measurement, etc., can solve problems such as untimely monitoring, false alarms, and difficult balance of alarm thresholds

Active Publication Date: 2020-09-22
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for predicting current-carrying faults of circuit breakers, which solves the problem of untimely monitoring or false alarms in the prior art fixed threshold alarm mode, which is difficult to balance the alarm threshold

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  • Prediction method for current-carrying fault of circuit breaker

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as figure 1 The structure of the circuit breaker current-carrying fault prediction system of the present invention is to include a plurality of monitoring slaves 1, a monitoring host 2 and a host computer 3. Each monitoring slave 1 is interconnected with the monitoring host 2 through a 433MHz wireless transmission mode respectively. The monitoring host 2 is interconnected with the upper computer 3 through RS485 / GPRS; the monitoring slave 1 is used to measure the temperature signal of the temperature node of the power equipment (the embodiment is a 10KV circuit breaker), the current signal of the contact, and the voltage signal of the slave power supply collect, and the control chip in it uploads the collected data to the monitoring host 2 through the wireless module; Humidity sensor (for temperature and humidity display); the mon...

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Abstract

The invention discloses a method for predicting a current-carrying fault of a circuit breaker. The steps include: 1) collecting relevant data, each monitoring slave machine collects the temperature signal, current signal and slave machine power supply voltage signal on the corresponding circuit breaker contact, And through 433MHz wireless transmission to the monitoring host, after the monitoring host receives the collected data sent by each monitoring slave, it compares with the temperature and humidity value detected by the temperature and humidity sensor on the monitoring host to form a temperature rise value; 2) adopts dynamic The threshold algorithm removes the singular point data. If the growth rate of the two samples is less than Δ, the similar day method is used; if the growth rate is greater than Δ, the equivalent resistance analysis method is used to predict the temperature development trend; that is, if the growth rate is greater than Δ, the instant fault is performed Forecast; if the growth rate is less than Δ, long-term fault prediction is performed. The method of the invention has high precision.

Description

technical field [0001] The invention belongs to the technical field of power system safety monitoring, and relates to a method for predicting a current-carrying fault of a circuit breaker. Background technique [0002] The circuit breaker is an important device that can carry the operating current on the power line and break and close it in time. It is installed in the switch cabinet to protect the power distribution system or user equipment, or directly used in outdoor complex substations. In the environment, for example, a 10kV circuit breaker is a kind of high-voltage circuit breaker. [0003] The connection parts between the contacts in the circuit breaker will heat up due to the aging of materials or the increase of contact resistance during long-term operation. Since most of these heating parts are inside the power equipment, the current monitoring methods cannot effectively realize online monitoring. At the same time, the complexity of the power distribution network ...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01K13/00
CPCG01K13/00G01R31/327
Inventor 黄新波薛智鹏王海东李志文吴明松
Owner XI'AN POLYTECHNIC UNIVERSITY
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