Piezoelectric acoustic detector for testing live partial discharge of switch on 10kV column

Abstract

The invention discloses a piezoelectric acoustic detector for testing live partial discharge of a switch on a 10kV column, which comprises a piezoelectric component, a fixing seat and a shell, whereinthe fixing seat and the piezoelectric component are arranged in the shell, the piezoelectric component comprises two piezoelectric ceramic wafers arranged in a laminated mode and a metal sheet whichis glued and fixed between the two piezoelectric ceramic wafers, the metal sheet extends out of the piezoelectric ceramic wafers, a layer of surface electrode is plated on the surface of each piezoelectric ceramic wafer, the surface electrode is connected with a output electrode through a lead, the central part of the piezoelectric component is connected with a conical push cone into a whole bodythrough a combination shaft, the piezoelectric component is fixed on a fixing base in a form of a simple supporting edge, and a metal protective net is arranged above the metal shell. According to theinvention, a sensor has an open structure and has the advantages of high sensitivity, small volume, easy manufacture and the like.

Description

technical field [0001] The invention relates to a partial discharge testing technology for live work in the medium-voltage field, in particular to a piezoelectric acoustic detector for live partial discharge testing of a switch on a medium-voltage pole. Background technique [0002] The 10kV pole-mounted switchgear is of high importance. The 10kV pole-mounted switch is generally used as the main line segment, contact or incoming line switch for heavy-load users. Its failure or power failure affects many users and may even affect the normal power supply of the entire line. When a failure occurs, it will affect the reliable power supply of the user, and cause a large loss to the production of the user and the power supply of the power supply enterprise. [0003] The installation position and device of the 10kV switch on the pole are special: 1), high from the ground, difficult to inspect and repair: the switch on the 10kV pole is installed on the cement pole of the outdoor ove...

AI Technical Summary

Problems solved by technology

[0002] The 10kV pole-mounted switchgear is of high importance. The 10kV pole-mounted switch is generally used as the main line segment, connection or incoming line switch for users with heavy loads. Its failure or power failure affects many users and may even affect the normal power supply of the entire line.

When a failure occurs, it will affect the user's reliable power supply, and cause a large loss to the user's production and the power supply of the power supply company.

[0003] The installation position and device of the 10kV switch on the pole are special: 1), high from the ground, difficult to inspect and repair: the switch on the 10kV pole is installed on the cement pole of the outdoor overhead line, the installation position is relatively high, and the distance from the ground is generally more than 9m, the State Grid The company's "Distribution Network Operation Regulations" Q / GDW519-2010 requires that the installation position of electrical equipment on the overhead line column should not be less than 9m in densely populated areas such as urban areas

During the inspection, the personnel on the ground cannot clearly check the status of the switchgear on the column with the naked eye, so the inspection is more difficult

At the same time, due to the high installation position and close to the charged body, the lines and equipment must be powered off during maintenance, and personnel must work on the pole, which is very difficult.

2) The 10kV pole-mounted switchgear is small, and the internal operating mechanism gap of the equipment is small, only 10cm-20cm, which does not meet the 10kV electrical safety distance requirement, and must be effectively insulated by sealed vacuum or SF6 gas

And because the 10kV pole-mounted switch is generally installed in the field, the on-site environment is complex, and the equipment must be sealed, so that the status of the equipment cannot be effectively judged by the naked eye

The 10kV pole-mounted switch is generally used as an overhead line breaking operation, and one side must always be charged, resulting in the equipment always being charged, and personnel are not allowed to directly touch the equipment

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