A method and device for detecting the opening and closing state of an open isolating switch

Abstract

The invention discloses an open type isolation switch open / close state detection method and device; the method comprises the following steps: building an open type isolation switch finite element simulation model; calibrating and verifying the finite element simulation model; respectively selecting at least one most sensitive mechanical oscillation signal change point on the surface of an open type isolation switch support, an operating mechanism and a transmission system as the vibration measuring point positions; obtaining the corresponding relations between typical machinery faults and vibration signals; carrying out field vibration detection for the open type isolation switch with an unknown machinery state on the vibration measuring point positions of the open type isolation switch support, the operating mechanism and the transmission system, and estimating the corresponding machinery states according to a fault diagnosis classifier. The method and device can accurately detect the open type isolation switch open / close state without changing the structure, are high in safety and reliability, thus satisfying the field operation maintenance needs.

Description

technical field [0001] The invention relates to the technical field of state detection of electrical equipment, in particular to a method for detecting the on-off state of an open isolating switch. Background technique [0002] As the most widely used switchgear in the power system, the open disconnector operates under high voltage and high current conditions, and its working reliability is closely related to the safety of the power grid. Since the open-type isolating switch is installed outdoors, its operating conditions are harsh, and most of its components are basically exposed, which is prone to various potential defects, resulting in mechanical or electrical failures. It has become a short board for safe operation in power systems. Therefore, there is an urgent need to develop the application of open-type isolating switch opening and closing state detection technology. [0003] At present, for the detection of the opening and closing state after the relevant operation ...

AI Technical Summary

Problems solved by technology

Among them, the visual method is susceptible to the subjective influence of the observer, and has low accuracy and poor efficiency; the temperature measurement method is to measure the temperature of the contact of the disconnector, and indirectly evaluate whether the disconnector is in place by the change of temperature, but the temperature change exists Hysteresis, it is impossible to detect the state of the isolating switch in place in real time, and this method is seriously affected by the performance, parameters, load and external environment of the isolating switch, and the effectiveness of the judgment is poor; the dynamometric method installs the force sensor near the contact point, Measure the change and magnitude of the pressure to judge the opening and closing state and abnormal state of the isolating switch. The load cell may affect the normal contact of the equipment; the distance measuring method is to use the distance measuring sensor or proximity sensor to measure the distance between the two arms of the U-shaped groove of the moving contact Change to judge the contact state of the isolating switch. Due to the working characteristics and space constraints of the isolating switch, the installation point of the ranging or proximity sensor does not match the contact point of the actual dynamic and static contact. It is inconvenient to install and maintain, and the distance measuring or The proximity sensor itself has a certain error, so the measurement is not reliable; the optical method uses an optical sensor to directly detect the position of the dynamic and static contacts of the isolating switch, and the output terminal of the comparison judgment circuit of the light emitting and receiving device is connected to the auxiliary contact of the isolating switch to determine the isolating switch. Whether the separation and closing are in place is a direct measurement method. It is not interfered by strong electromagnetic fields and has strong anti-interference ability. However, when using single-beam light emission and reception, the position is not easy to ensure accurate, the detection process is unreliable, and it is adjusted after installation. Difficult, difficult to measure

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