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Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line

A technology of on-load tap changer and monitoring device, which is applied in the direction of testing dielectric strength and test ship construction, can solve the problem of low precision and difficulty in ensuring the oil dielectric strength of the tap changer, and cannot accurately and comprehensively respond to the on-load switch. Oil quality and other issues, to achieve the effect of ensuring insulation level, light weight, and intuitive man-machine interface

Active Publication Date: 2012-11-21
SHANGHAI HUAMING POWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control method cannot accurately and comprehensively reflect the quality of the on-load switch oil, and the accuracy is not high. It is difficult to directly and accurately ensure the dielectric strength of the tap changer oil, and it cannot fully meet the current development requirements for high safety and high reliability in power operation.

Method used

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  • Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line
  • Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line
  • Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] see figure 1 , the on-line monitoring device for the electric strength of the insulating oil medium of the on-load tap changer and the on-line oil cleaning device for the on-load switch (not shown in the figure) of the present invention are installed in a box body 100 . The box body 100 is composed of a box bottom plate made of metal and four side box panels connected around the box bottom plate. A box door is hinged on one side box panel of the box body 100. There is an opening and locking switch assembly 110 between them, the opening and locking switch assembly 110 is equivalent to a door switch, and its signal is connected to the controller 200 through the opening signal input terminal 210 provided on the controller 200 (see figure 2 ), once the box door is opened, the cover opening and locking switch assembly 110 sends a signal to the controller 200, and the controller 200 cuts off the power supply of the step-up transformer T1 to ensure safety.

[0029] A high-vo...

Embodiment 2

[0036] This embodiment is the same as Embodiment 1 except for the structure of the high-voltage test chamber and the absence of a high-pressure channel chamber.

[0037] In this embodiment, the step-up transformer T1 and the high-voltage test chamber 120' are installed on the bottom plate of the box body 100, wherein the output low-voltage end of the step-up transformer T1 is located at the end of the step-up transformer T1 close to the bottom plate of the box and is connected to the bottom plate of the box To form a ground, the output high voltage terminal T1b of the step-up transformer T1 is located at the end of the step-up transformer T1 close to the box door.

[0038] The coaxial lines of a pair of test electrodes A1 and A2 arranged on the high-voltage test chamber 120' are perpendicular to the bottom of the box, and the terminal of the test electrode A1 near the bottom of the box is connected to the bottom of the box to form a ground, and the side near the door of the box...

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Abstract

The invention discloses a device for monitoring the electric strength of the insulating oil medium for an on-load tapping switch on line, comprising a high-voltage testing bin and a controller. The high-voltage testing bin is connected in series in a circulating pipe of an on-load switch on-line oil purifying device and provided with a pair of testing electrodes; the output end of a voltage-increasing transformer T1 is electrically connected with the wiring terminals of a pair of testing electrodes so as to apply testing voltage to the pair of testing electrodes; and the controller is used for controlling the voltage increasing and decreasing of the voltage-increasing transformer T1. When the oil breaks down, due to the dual protection of an overcurrent protection device and the controller, the high-voltage power supply is cut off quickly and automatically. When the electric strength of the insulating oil medium for the on-load tapping switch is lower than the predetermined index, the oil is filtered automatically on line by the high-precision high-efficiency particle removing filter and water removing filter, thus the content of particle impurities and trace water in the oil is reduced, the breakdown voltage of the oil is improved, the insulating level of the on-load tapping switch is guaranteed, and the requirements for high-security high-reliability power operation at present are adapted better.

Description

technical field [0001] The invention relates to an on-line monitoring device for the electric strength of the insulating oil medium in electrical components, in particular to an on-line monitoring device for the electric strength of the insulating oil medium of an on-load tap changer. Background technique [0002] When the on-load tap-changer is switched quickly under load, its insulating oil will decompose under the action of the arc to produce free carbon, hydrogen, flammable hydrocarbon gas, and trace metal particles. Part of impurities such as free carbon and metal particles will accumulate on the surface of the tap changer insulation, especially near the live contacts where the electric field is concentrated; the other part is suspended in the oil; most of them are deposited at the bottom of the switch oil chamber . The particle impurities distributed on the surface of the insulating part will reduce the dielectric strength of the insulating part, and the particle impu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/16
Inventor 肖日明
Owner SHANGHAI HUAMING POWER EQUIP CO LTD
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