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Device and method for online monitoring power supply system external Insulation filthy status

A technology of power supply system and monitoring device, which is used in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of insulators or bushings that cannot be monitored at the same time, the degree of new signal interference is large, and high-speed sampling cannot be achieved. Achieve the effect of filtering out three-phase unbalanced current and alternating interference current, good protection, and stable test data

Inactive Publication Date: 2007-09-19
XI AN JIAOTONG UNIV
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Problems solved by technology

Thereby the following deficiencies are exposed, (1) the existing on-line measurement method with point instead of surface cannot monitor all insulators or bushings at the same time; (2) the measurement must be carried out by splitting and time-sharing, and high-speed sampling cannot be realized; (3) the sensor There are many and complicated lines; (4) they are all passive monitoring methods, and the sampling of new signals is greatly disturbed

Method used

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  • Device and method for online monitoring power supply system external Insulation filthy status
  • Device and method for online monitoring power supply system external Insulation filthy status
  • Device and method for online monitoring power supply system external Insulation filthy status

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028]As shown in Figure 1, an on-line monitoring device for the pollution state of the external insulation of the power supply system of the present invention includes a lower computer 8 with a man-machine interface 7, and a pollution sound and light alarm unit connected to the control output of the lower computer 8 14 and the pollution real-time display evaluation unit 15, the input of the lower computer 8 is respectively connected to two sampling signals, one of which is connected to a neutral point O of the three-phase voltage transformer 3 connected with the three-phase overhead line 1 in a star connection. A DC superposition unit 4, a protection and filter unit 5 is connected in series between the DC superposition unit 4 and the ground, the output of the protection and filter unit 5 is connected to the lower computer 8 through a sampling ...

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Abstract

Aiming to some disadvantages in the passive on-line monitoring methods adopting sensors sampling in existence, the present invention provides an initiative type on-line monitoring device and method thereof with its monitoring system outer insulation surface being in a dirt state. The input of said monitoring device lower machine is connected respectively to two routes of sampling signals: one route is connected to a direct current superposition unit through a neutral point of a voltage transformer connected to a three-phase overhead line, wherein a protection unit and a filtering unit are connected in serial between the superposition unit and the ground, which output is connected to the lower machine through a sampling signal adjusting unit; the other route is connected to an impulse current sensor through a groups of connection wires between neutral points of three-phase high voltage isolation capacitor and the ground, which is connected to the lower machine through pulse shaping and a count unit. The present invention with a powerful anti-interference ability and without adding a sensor to insulators, is suitable for an on-line monitoring of the outer insulation dirt sate of AC220V-35kv low voltage distribution station / circuit.

Description

technical field [0001] The invention relates to an on-line monitoring device and method for a power supply system, in particular to an on-line monitoring device and method for the pollution state of the external insulation of a short-distance 220V-35kV power supply system. Background technique [0002] With the increasing development of industrial and agricultural production, the pollution of the external insulation surface of the power supply system is becoming more and more serious. The dirt deposited on the insulator is prone to pollution flashover in the weather with high humidity, which seriously affects the reliability of the power supply system. According to statistics, the number of pollution flashover accidents is second only to lightning damage in the total number of accidents in the power system, but the damage caused by pollution flashover accidents is 10 times that of lightning damage. Almost all of the country's six major power grids have experienced large-scal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00G08B21/00
Inventor 郑晓泉马丽婵
Owner XI AN JIAOTONG UNIV
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