Internal pressure compensation device for oil-impregnated paper insulating sleeve

Abstract

The invention relates to an internal pressure compensation device for an oil-impregnated paper insulating sleeve, which is particularly suitable for internal pressure compensation for oil-SF6 or oil-oil sleeve which is hardly observed by using an oil meter. The internal pressure compensation device comprises a substrate, a compensation device shell and an oil cavity formed in the compensation device shell, and is characterized in that: a freely telescopic corrugated expansion tube bank of which the tubes are arranged in parallel is arranged in the compensation device; and the oil cavity is positioned outside the corrugated expansion tube bank, and is communicated with insulating oil in the insulating sleeve through an oil-way connecting tube. The internal pressure compensation device has the advantages that: a pressure indicating gauge communicated with an alarm system is arranged, so when the oil level or oil pressure exceeds a set limit under the condition that the oil level of the sleeve cannot be observed, the device can indicate to alarm to prevent a phenomenon that the oil level in the insulting sleeve is too low and the pressure is abnormal to cause failure; and by arranging the freely telescopic expansion tube bank, the insulating oil in the insulating sleeve is subjected to volume compensation, the insulating oil is not contacted with the air, and the performance of the insulation oil is prevented from being reduced due to the air.

Description

Technical field [0001] The invention relates to an internal pressure compensation and an overpressure alarm device for high-voltage oil-paper insulated bushing electrical products, and is particularly suitable for the internal pressure compensation of oil-SF6 or oil-oil bushings enclosed in a complete set of electrical appliances that are difficult to directly observe with an oil gauge. Background technique [0002] In order to compensate for the rise and fall of the internal oil medium and pressure changes caused by temperature changes during the operation of the oil-paper insulation sleeve, it is generally used to directly install or attach a hollow sealed container—oil pillow (cabinet) to the upper part of the sleeve. The pillow is filled with the same amount of insulating oil as the insulating sleeve. The rest of the oil pillow is an air cavity. When the oil temperature of the insulating sleeve changes, the oil level indicator set on the oil pillow can reflect the internal oil...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of internal pressure compensating device for oil-paper insulating bushings, which can realize the above-mentioned control when the oil level cannot be directly observed on the bushing, and when the internal pressure of the bushing is abnormal due to failure or other reasons At the same time, the device also solves the above-mentioned problem that the insulating oil and the compensated air contact each other and affect the performance of the insulating oil

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