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Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard

A technology of dielectric loss and capacitive equipment, which is applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems that cannot satisfy the dielectric loss measurement unit, so as to avoid signal attenuation and susceptibility to external interference, Guaranteed measurement accuracy and cost savings

Active Publication Date: 2012-07-11
NARI TECH CO LTD +1
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Problems solved by technology

[0009] 1. In the smart substation, the bus PT voltage is collected locally through the merging unit, which cannot meet the current requirements of the dielectric loss measurement unit to access the analog signal through a cable. This invention needs to solve the problem of sampling based on the IEC61850-9-2 standard in the smart substation. Dielectric loss measurement method;

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  • Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard
  • Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard
  • Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard

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Embodiment Construction

[0037]Based on the IEC61850-9-2 standard on-line monitoring method for the dielectric loss of capacitive equipment, the dielectric loss measurement unit collects the reference voltage signal through IEC61850-9-2 standard communication with the merging unit, and realizes the reference voltage and leakage through the optical fiber B code time synchronization Synchronous collection of current, through high-precision zero-flux transformer and 16-bit AD to realize the collection of leakage current, through the resampling algorithm and software frequency tracking algorithm to realize the elimination of interference signals and the sampling of the whole cycle, to realize the dielectric loss of capacitive equipment High-precision online monitoring, including the following steps:

[0038] 1) Connect a high-precision zero-flux leakage current transformer on the grounding wire of the equipment, and connect the voltage signal output by the transformer to the locally installed dielectric lo...

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Abstract

The invention discloses a capacitive equipment medium loss online monitoring method based on an IEC61850-9-2 sampling standard in an intelligent substation. According to the invention, medium loss measurement based on the IEC61850-9-2 sampling standard in the intelligent substation can be realized. Through fiber B code timing, synchronization acquisition of a reference voltage and a leakage current can be realized. Through a high-precision zero-flux mutual inductor and a 16 bit AD, the acquisition of the leakage current can be realized. Through a resampling algorithm and a software frequency tracking algorithm, rejection of an interference signal and full period sampling can be realized. And high-precision online monitoring of the capacitive equipment medium loss can be realized. By using the method of the invention, a medium loss measurement problem based on the digital sampling in the intelligent substation can be solved.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of electric power equipment. More precisely, the invention relates to an on-line monitoring method for dielectric loss of capacitive equipment based on the IEC61850-9-2 sampling standard in an intelligent substation. Background technique [0002] Since 2010, the construction of smart substations has gradually become the mainstream of new substations, and will lead to explosive growth in the future. In the construction of smart substations, it is emphasized that through online monitoring of the status of primary equipment, the condition maintenance of primary equipment and timely early warning of failures will be gradually realized, so as to achieve less maintenance and maintenance-free, and avoid power outages and casualties caused by equipment failures. Capacitive power equipment occupies a large proportion in the power transmission and transformation system, such as transformer bushin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
Inventor 张斌周斌沈建杨小铭
Owner NARI TECH CO LTD
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