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A control and protection method and system for gis same-frequency and same-phase AC withstand voltage test

A same-frequency, same-phase, control and protection technology, applied in the field of electric power, can solve problems such as the failure of same-frequency, same-phase withstand voltage test protection, and achieve the effect of avoiding adverse effects

Active Publication Date: 2017-04-05
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of this, the technical problem to be solved by the present invention is to provide a control and protection method and system for the same-frequency and same-phase withstand voltage test, which solves the problem that conventional protection methods cannot protect the same-frequency and same-phase withstand voltage test

Method used

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  • A control and protection method and system for gis same-frequency and same-phase AC withstand voltage test
  • A control and protection method and system for gis same-frequency and same-phase AC withstand voltage test
  • A control and protection method and system for gis same-frequency and same-phase AC withstand voltage test

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Embodiment 1

[0083] A kind of GIS co-frequency and co-phase test control and protection method provided by the present invention comprises the following steps:

[0084] S100: acquiring a reference voltage and a test voltage;

[0085] S200: Calculate the voltage value, frequency difference and phase difference between the reference voltage and the test voltage;

[0086] S300: Obtain the rated voltage and preset protection setting of the equipment to be tested;

[0087] S400: Compare the voltage value, frequency difference and phase difference of the reference voltage and the test voltage with the preset protection setting value to judge whether the frequency phase protection, high-voltage overvoltage protection and high-voltage flashover protection operate; if each parameter exceeds the preset protection If the preset value is not exceeded, the corresponding protection will act and the power will be cut off; if the preset protection value is not exceeded, the protection will not operate; ...

Embodiment 2

[0144] Figure 5 A GIS co-frequency and co-phase test control and protection device protection control flow chart provided by the embodiment of this application, Figure 5 Among them, the GIS same-frequency and same-phase test controls the protective device protection control process including:

[0145] S100: acquiring a reference voltage and a test voltage;

[0146] S200: Calculate the voltage value, frequency difference and phase difference between the reference voltage and the test voltage;

[0147] S300: Obtain the rated voltage and preset protection setting of the equipment to be tested;

[0148] S400: Compare the voltage value, frequency difference and phase difference of the reference voltage and the test voltage with the preset protection setting value to judge whether the frequency phase protection, high-voltage overvoltage protection and high-voltage flashover protection operate; if each parameter exceeds the preset protection If the preset value is not exceeded, ...

Embodiment 3

[0157] figure 2 It is a schematic diagram of the connection between a GIS same-frequency and same-phase test control protection device and the same-frequency and same-phase test system provided by the embodiment of this application.

[0158] Such as figure 2 As shown, the same frequency and same phase test system includes the same frequency and same phase test power supply 1, series resonance device 2 and voltage divider 3; the horizontal line at the top of the figure indicates the busbar, and the transformer PT is connected to the busbar, and the reference voltage output by the transformer PT To the control protection device, the test power supply with the same frequency and phase is connected to the control protection device through the same frequency and phase control line and the power communication line, and the voltage divider 23 inputs the test voltage signal into the control protection device.

[0159] The reference voltage input terminal of the same-frequency and s...

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Abstract

The invention discloses a GIS (gas insulated switchgear) same-frequency same-phase alternating-current voltage withstand test control protection method which includes frequency and phase protection, over-voltage protection and high-voltage flash protection. Particularly, the method includes the steps of firstly, acquiring a reference voltage value and a test voltage value and calculating a frequency difference and a phase difference; secondly, comparing the voltage values and the phase difference with preset protective constant values; and thirdly, judging whether any of the three types of protection meets action condition or not; if no, then allowing a same-frequency same-phase power supply to run normally; if yes, then cutting off the power supply. The method is applied to the same-frequency same-phase alternating-current voltage withstand test and integrates functions of protection, control and measurement. Compared with the existing control protection method, the frequency and phase protection method based on frequency and phase judgment and the overvoltage and flash protection to isolating distance can effectively prevent emergency such as frequency and phase inconsistency and breakdown of isolating distance caused in the same-frequency same-phase alternating-current voltage withstand test from damaging running systems and test equipment and hurting personnel.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a GIS same-frequency and same-phase AC withstand voltage test control and protection method and system. Background technique [0002] Gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS) is more and more widely used in power systems, but after interval expansion and maintenance of GIS (especially double-bus connection GIS), it is necessary to withstand the power failure of the original operating part. pressure test. The GIS expansion interval or disassembly maintenance interval is only disconnected from the adjacent operating part through the isolation switch. If the operating part is not powered off, the test voltage and the operating voltage may reversely superimpose at the fracture of the isolation switch during AC withstand voltage, resulting in breakdown of the isolation fracture This will endanger the situation of the operating equipment, so DL / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22G01R31/327
Inventor 王谦龙英凯吴高林伏进肖前波葛凯何宁印华
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST