Intelligent state monitoring method of medium-pressure switch apparatus
A switchgear and medium-voltage technology, which is applied in the direction of electric power measurement, measuring electricity, and measuring devices through current/voltage, can solve the problem of inability to realize microcomputer measurement, on-line monitoring of host communication operation status of microcomputer protection and monitoring systems, and medium-voltage power grids. Safe and reliable operation barriers, lack of intelligent monitoring functions and other issues, to achieve stable and reliable work performance, simple switchgear status monitoring, and low operating costs
Inactive Publication Date: 2009-05-27
上海德力西集团有限公司
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Problems solved by technology
The switchgear in the prior art lacks intelligent monitoring functions, and cannot realize functions such as microcomputer measurement, microcomputer protection, communication with the host computer of the monitoring system, and online monitoring of the operating status of the switchgear, thus bringing difficulties to the safe and reliable operation of the medium-voltage power grid. big obstacles and impact
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[0042] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.
[0043] see figure 1 As shown, the intelligent state monitoring method for medium voltage switchgear includes the following steps:
[0044] (1) Collect the voltage and current signals of the medium voltage grid, specifically:
[0045] AC sampling of two line voltages and two phase currents using current transformers and voltage transformers in the medium voltage grid;
[0046] (2) The collected voltage and current signals are subjected to isolation transformation processing, specifically:
[0047] Use integrated operational amplifiers to perform isolation and transformation processing of voltage and current signals;
[0048] (3) Perform AC sampling on the voltage and current signals after isolation and transformation, the corresponding sampling points are 12, 16, 20 or 24, and the sampling interval is between 0.8 and 1.8 milliseconds;
[0...
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The invention relates to a method for monitoring the intelligent state of a medium-voltage switching device, which comprises the steps of collecting voltage and current signals of medium-voltage electric power network, carrying out isolation transform processing, carrying out alternating current sampling, calculating voltage and current effective values, calculating triphrase active power, triphrase total apparent power, reactive power, power factor, active electric energy and reactive electric energy, and carrying out corresponding follow-up monitoring processing operation. The method for monitoring the intelligent state of a medium-voltage switching device has protective function to time overcurrent, current quick-break and single-phrase earthing and has the functions of faults recording and online monitoring and diagnosis. The method can analyze and process the monitored data, judge the remaining service life of the switching device and calculate the maintenance time limit. Furthermore, by connecting and communicating with the monitoring host of a substation comprehensive automatic system, the method is provided with the communication function and simple monitoring function to the state of the switching device. The method has the advantages of simple realization process, lower running cost, stable and reliable working performance and wider application scope.
Description
technical field [0001] The invention relates to the field of medium-voltage power grid transformation, in particular to the technical field of medium-voltage power grid switchgear, and specifically refers to an intelligent state monitoring method for medium-voltage switchgear. Background technique [0002] In modern society, with the development and application of substation integrated automation system and distribution automation system, the intelligentization of switchgear has become an inevitable trend. The switchgear in the prior art lacks intelligent monitoring functions, and cannot realize functions such as microcomputer measurement, microcomputer protection, communication with the host computer of the monitoring system, and online monitoring of the operating status of the switchgear, which brings great difficulties to the safe and reliable operation of the medium-voltage power grid. great obstacles and influences. Contents of the invention [0003] The purpose of t...
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IPC IPC(8): G01R31/00G01R21/06G01R22/00
Inventor 刘永辉凌煜王道宏芦定军
Owner 上海德力西集团有限公司
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