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Insulation monitor for capacitive equalizing insulation core

A technology of capacitive voltage equalization and insulating core, which is applied in the direction of voltage divider, measuring current/voltage, instruments, etc., and can solve problems such as unsafe operation

Active Publication Date: 2015-08-05
BEIJING HENGRUI TIANWEI ELECTRIC POWER ELECTRONICSCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain difficulties in realizing this measure, and it will also bring unsafe factors to the operation.

Method used

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  • Insulation monitor for capacitive equalizing insulation core
  • Insulation monitor for capacitive equalizing insulation core
  • Insulation monitor for capacitive equalizing insulation core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] See figure 2 , the insulation monitor of the capacitor voltage equalizing insulating core is composed of a capacitor voltage equalizing insulating core 1, a low-voltage capacitor 2 and a display 3, and is composed of an insulating layer (such as polytetrafluoroethylene film, glass fiber impregnated with epoxy resin or oil paper insulation, etc.) ) and capacitive screens of conductive or semiconductive materials (such as aluminum foil, semiconductive tape, etc.) laid alternately (such as wrapping). The same process method is used to lay the insulating layer and the grounding screen outside the end screen of the capacitor voltage equalizing insulating core 1 (for example, insulating materials such as polytetrafluoroethylene film, epoxy resin impregnated glass fiber or oil paper insulation and aluminum foil or semi-conductive tape are still used. Alternately surrounded by equal-capacitance screens) to form a low-voltage capacitor 2, the monitoring terminal 4 is drawn out ...

Embodiment approach 2

[0022] See image 3 , the insulation monitor of the capacitor voltage equalizing insulating core is composed of a capacitor voltage equalizing insulating core 1, a low-voltage capacitor 2 and a display 3, and is composed of an insulating layer (such as polytetrafluoroethylene film, glass fiber impregnated with epoxy resin or oil paper insulation, etc.) ) and capacitive screens of conductive or semi-conductive materials (such as aluminum foil, semi-conductive tape, etc.) are laid alternately (such as wrapping) to form the last screen of the capacitive voltage equalizing insulating core 1. (For example, polytetrafluoroethylene film, epoxy resin impregnated glass fiber or oil paper insulation and other insulating materials are alternately wrapped with capacitive screens such as aluminum foil or semi-conductive tape) to form a low-voltage capacitor 2. The connection point of the capacitor 2 leads to the monitoring terminal 4, and the monitoring terminal 4 and the grounding termina...

Embodiment approach 3

[0024] See Figure 4 , the insulation monitor of the capacitor voltage equalizing insulating core is composed of a capacitor voltage equalizing insulating core 1, a low-voltage capacitor 2 and a display 3, and is composed of an insulating layer (such as polytetrafluoroethylene film, glass fiber impregnated with epoxy resin or oil paper insulation, etc.) ) and capacitive screens of conductive or semi-conductive materials (such as aluminum foil, semi-conductive tape) are laid alternately to form the final screen of the capacitor voltage equalizing insulating core 1. Insulation materials such as vinyl film, epoxy resin impregnated glass fiber or oil paper insulation and capacitive screens such as aluminum foil or semi-conductive tape are alternately wrapped) to form a low-voltage capacitor 2, and the monitoring terminal is drawn out at the connection point between the capacitor voltage equalizing insulating core 1 and the low-voltage capacitor 2 4. Through the monitoring terminal...

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Abstract

The invention relates to a capacitance-type insulating capacitive voltage-dividing insulation monitor which is used as a monitor for monitoring a capacitive current of capacitance-type insulation to judge insulation quality. The insulation monitor is usually used in capacitive insulating high-voltage electrical appliances such as a current transformer, a transformer bushing, a wall bushing, etc. A damaged condition of the insulation can be determined by measuring capacitive current of capacitance-type insulation, and arranging a power cut to perform an overhaul without delay at a beginning that damage can prevent accidents. When a capacitive voltage-dividing insulating core is manufactured, a measuring capacitor C2 with large capacitance is disposed out of an original last screen by a same process with the capacitive voltage-dividing core, the measuring capacitor C2 is connected in series with the original capacitive voltage-dividing insulating core to form a capacitive divider, and the measuring capacitor C2 is used as a sensor to extract a signal. And by using a connected light-emitting diode, an AC ammeter or an on-line insulation monitor formed by a current transducer, a transmission line and a merging unit, changes of the capacitive current and the capacitance are displayed on line, and the beginning of the damage of a device and the damaged condition are informed on a distribution board or on the internet.

Description

technical field [0001] It is an insulation monitor used to monitor the capacitive current of the capacitive equalizing insulating core to judge whether the insulation is good or bad. It is usually used in high-voltage electrical products such as wall bushings, transformer bushings, and current transformers. Background technique [0002] The main insulation of capacitively insulated high-voltage electrical appliances such as current transformers and high-voltage bushings is a capacitive voltage equalizing insulating core composed of insulating layers and conductive or semi-conductive screens alternately arranged, which is equivalent to multiple capacitors connected in series to conductors and ground. between. The insulation damage process is that the insulation of one of the capacitive screens breaks down first, causing the insulation of other capacitive screens to break down layer by layer, and finally causes the overall insulation breakdown. In the process of reducing the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R19/00G01R27/26G01R15/06
Inventor 王如璋王海亮卓京水
Owner BEIJING HENGRUI TIANWEI ELECTRIC POWER ELECTRONICSCO
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