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The protective connection structure to prevent the flashover impact of the components under test in the variable frequency power supply cabinet

A variable frequency power supply cabinet and connection structure technology, applied in electrical components, emergency protection circuit devices, testing dielectric strength and other directions, can solve problems such as damage to variable frequency power supply cabinet components, achieve simple measures, high reliability, and prevent flashover. impact effect

Active Publication Date: 2017-08-18
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to completely solve the problem that the components of the variable frequency power supply cabinet are often damaged when the test product is flashover and breakdown, provide protection measures to prevent the flashover impact of the internal components of the variable frequency power supply cabinet, and provide a method to prevent frequency conversion The protective connection structure for the flashover impact of the components under test in the power cabinet

Method used

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  • The protective connection structure to prevent the flashover impact of the components under test in the variable frequency power supply cabinet
  • The protective connection structure to prevent the flashover impact of the components under test in the variable frequency power supply cabinet

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention is further described: as figure 1 As shown, the circuit structure of the on-site AC withstand voltage test using a series resonant device is: three-phase power input into the variable frequency power cabinet 1, the output of the variable frequency power cabinet 1 is connected to the input terminal of the excitation transformer 5, and the output terminal of the excitation transformer 5 is connected to the L-C resonant circuit. is a series reactor, and C is a parallel connection between the load capacitor 8 and the voltage divider 7 capacitor; figure 2 As shown in the embodiment, the power supply is supplied by the mains, and the three-phase power lines are respectively connected with the resistance-capacitance absorbing device, the three-phase power supply is connected to the MOA lightning arrester for G2, and the power line is connected to the frequency converter main circuit 4 of the frequency conver...

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Abstract

A protective connection structure for preventing the flashover impact of components under test in a variable frequency power supply cabinet. The secondary common terminal of the resonant circuit, the protective common terminal G2 (including the shell of the variable frequency power supply cabinet, the shell of the excitation transformer, the ground terminal of the vehicle body and the ground terminal of the voltage divider), and the common terminal G3 of the control circuit are independently grounded. The phases of the power supply are connected to the resistance-capacitance absorption device respectively, and the three-phase power supply is connected to the MOA arrester to the ground, which is used to absorb and suppress overvoltage. side.

Description

technical field [0001] The invention relates to the technical field of electrical equipment insulation detection, in particular to a protective connection structure for preventing the flashover impact of components under test in a variable frequency power supply cabinet. Background technique [0002] Due to the small insulation margin of domestic high-voltage electrical equipment, the raw materials of the manufacturing plant and the quality of purchased parts are uneven, and the process control of manufacturing, assembly, and installation is highly dispersed. In order to ensure the safe operation of high-voltage electrical equipment after it is put into operation , When the high-voltage electrical equipment is installed, an on-site AC withstand voltage test is required to ensure that the equipment put into operation is safe and reliable. [0003] For GIS ("gas insulated metal-enclosed switchgear", referring to sulfur hexafluoride enclosed combined electrical appliances), the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12H02H7/20
Inventor 陈敏陈隽汪涛阮羚白尧
Owner STATE GRID CORP OF CHINA