Online power system circuit breaker mechanical fault diagnosis system

Abstract

The invention discloses an online power system circuit breaker fault diagnosis system, which comprises a signal acquisition module, a signal processing system, and a shock-proof and moisture-proof box, wherein the signal acquisition module is one or more sensors fixedly arranged on the circuit breaker and the operating mechanism of the circuit breaker, and signal and ground two-wire DC voltage is outputted; the signal processing system is electrically connected with the signal acquisition module and comprises a signal filtering module, a voltage conversion module, an A / D conversion module, an expert diagnosis module and a wireless transmitting module connected in sequence; the shock-proof and moisture-proof box is formed by buckling a groove-shaped shell and an upper cover plate, a sealing strip is arranged in a buckling seam between the groove-shaped shell and the cover plate, the box is internally provided with a moisture-proof moisture absorption bag, a plurality of vibration-proof pads are fixed on the surrounding walls of the groove-shaped shell, and a vibration-proof plate suspended in the box for mounting the signal processing system is fixed on the vibration-proof pad. The circuit breaker field state can be monitored in an online mode, the fault can be reproduced, fault data can be acquired, the mechanical fault diagnosis on the circuit breaker can be carried out, the system is vibration-proof and moisture-proof, wireless communication can be carried out, and the system is safe, reliable, economical and affordable.

Description

technical field [0001] The invention relates to an on-line diagnosis system for a mechanical failure of a circuit breaker in a power system, in particular to a system for diagnosing a mechanical failure of a circuit breaker in a power system with the functions of shockproof, moisture-proof and wireless communication. Background technique [0002] As an important device to protect the power system, the circuit breaker's reliability and stability are of great significance to the safety of the power grid. Due to the large number of parts in the mechanical part of the circuit breaker and the frequent movements of the mechanical parts, the probability of failure is very high. [0003] In the prior art, there are at least the following problems in the diagnosis of mechanical faults of circuit breakers: [0004] (1) At present, the diagnosis of mechanical faults of circuit breakers is usually carried out during regular maintenance or fault maintenance after a fault occurs. It belo...

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Problems solved by technology

[0004] (1) At present, the diagnosis of mechanical faults of circuit breakers is usually carried out during regular maintenance or fault maintenance after a fault occurs. It belongs to offline fault diagnosis, and sometimes mechanical faults cannot be found in time

Moreover, circuit breakers are generally not equipped with condition monitoring and fault diagnosis systems installed at the equipment work site, lack of fault recording data, and often fail to reproduce faults and obtain fault data during offline fault diagnosis, which seriously affects the mechanical fault diagnosis of circuit breakers.

[0005] (2) Circuit breakers, especially high-voltage circuit breakers, are required to open and close quickly, the action process time is very short, and the vibration impact is very large. The ordinary data acquisition system is directly installed on the circuit breaker or the contents of the operating mechanism box of the circuit breaker. Easily damaged by impact

Moreover, the working site of circuit breakers, especially outdoor circuit breakers, is easily affected by rain and fog, and ordinary data acquisition systems are easily unable to work or be damaged due to moisture.

[0006] (3) There is usually no redundant communication cable pipeline reserved between the control room of the substation and the circuit breaker. If the data of the fault diagnosis system is transmitted to the control room by cable, the engineering volume is large and technically uneconomical

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