Detection device and detection method for station-dedicated DC power system insulation monitoring device

An insulation monitoring device and DC power system technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as fluctuations, DC power system bus voltage offset, and influence on the safety of the power grid operation of the station power system

Inactive Publication Date: 2015-06-03
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the detection method of the insulation monitoring device and the selection of the detection resistor are improper, it will cause the offset and fluctuation of the bus voltage of the DC power system, and in severe cases, it will also affect the operation safety of the station power system and even the power grid.

Method used

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  • Detection device and detection method for station-dedicated DC power system insulation monitoring device

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Embodiment Construction

[0017] The design points of the present invention are as follows:

[0018] 1) The adjustable current module connected to the AC power supply realizes the output of the DC power supply through a miniature DC circuit breaker to replace the positive and negative busbars and the corresponding DC voltage of the station DC power supply system, and connect several DC output branches. Each DC output branch passes through the positive and negative poles of the micro DC circuit breaker and is connected to the ground with adjustable resistors and capacitors, which are used to set different DC grounding conditions and simulate the operating conditions of the DC power system for substations.

[0019] 2) The voltage regulator connected to the AC power supply realizes that the AC voltage is superimposed on the balance bridge detection resistor through a switch. Since the DC power supply insulation monitoring device must have a balance bridge resistance for a long time (≥8h) to withstand 250V ...

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Abstract

The invention discloses a detection device and a detection method for a station-dedicated DC power system insulation monitoring device. The detection device comprises a DC power unit, an auxiliary DC power unit, and an AC power unit, wherein the DC power unit comprises a first rectifying voltage-regulating module SDC1 and a DC busbar KM1; the auxiliary DC power unit comprises a second rectifying voltage-regulating module SDC2 and an auxiliary DC busbar KM2; the AC power unit comprises an AC voltage regulator T1 and a change-over switch S2; the detection device further comprises a ground insulation testing unit, and a waveform measuring and recording, AC jump and control protection circuit. The detection device has the benefits as follows: mutual jump alarm test, ring network alarm test, AC jump alarm test, balanced bridge AC superimposition resistance test, insulation resistance monitoring, grounding line selection correctness test and other function and performance detection or tests and verifications for the station-dedicated DC power system insulation monitoring device are realized, so as to prevent the improper DC power supply insulation monitoring device from influencing the safe production of a power system.

Description

technical field [0001] The invention relates to a DC power supply system for a power plant step-up station, a substation, a converter station, etc. of a power system, especially a detection device and a detection method for evaluating the parameters and functional performance of a DC power system insulation monitoring device for a station. Background technique [0002] With the development of society and economy, the power load is increasing day by day, the scale of the power system is constantly expanding, and more and more booster stations, substations, converter stations, etc. have been built and put into operation. Since electric power production is completed at one time, the operation safety and reliability of step-up stations, substations, etc. are directly related to power supply and consumption, and the economic losses and The social loss is huge. Station DC power supply system is to provide normal operation power for control, protection, communication and other loa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 李晶
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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