Protection connection structure for preventing components in variable frequency power cabinet from flashover impact of tested object

Abstract

A protection connection structure for preventing components in a variable frequency power cabinet from a flashover impact of a tested object is characterized in that a high-voltage resonance circuit common end G1 (including an exciting transformer high voltage tail and a load capacitor ground terminal), a resonance loop secondary common end and protective common end G2 (including a variable frequency power cabinet housing, an exciting transformer housing, a vehicle body ground terminal and a voltage divider ground terminal), and a control loop common end G3 which are in a loop in the variable frequency power cabinet are connected to the ground independently, a resistance-capacitance absorption device and a lightning arrester are additionally mounted between phases of a variable frequency power supply in the variable frequency power cabinet and between a phase and the ground respectively and are used for absorbing and inhibiting overvoltage, and a lightning arrester is additionally mounted on a high-voltage winding of the exciting transformer, so as to prevent an instant overvoltage generated by breakdown of the tested object from being coupled to a low voltage 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...

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

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