JPS5920924A - Bushing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bushing, and more particularly to a bushing having an oil level gauge on an expansion tube.

A newly assembled sealed type bushing used in gas insulation equipment and filled with insulating oil has an expansion tube 1, an insulator tube 2, and a support fitting 3, as shown in FIGS. 1 and 2. However, when one is used in air 4 and the other in insulating gas 5 (see Figure 1), and when one is used in insulating oil 6 and the other in insulating gas 5 (second (see figure). However, in any of these cases, the oil level inside the bushing must be monitored by the oil level gauge 7 provided on the expansion tube 1, and if the insulating gas 5 leaks into the bushing, the internal pressure of the bushing becomes excessive. Since it is dangerous, it is necessary to monitor the internal pressure in order to release it to the outside.

Regarding monitoring of this internal pressure, an automatic release type pressure relief valve (not shown) is attached to the expansion cylinder 1 separately from the oil level gauge 7, and when the internal pressure becomes high, I was trying to release the pressure.

By the way, such an automatic release type pressure relief valve has a problem in adjusting the operating pressure, and the operating pressure has many variations, but since it is installed separately from the oil level gauge 7, the oil level gauge 7
It was necessary to check the amount of oil by checking the amount of oil and checking whether the automatic release pressure relief valve was operating or not, respectively, making maintenance and management troublesome.

The present invention has been made in view of the above points, and its purpose is to provide a bushing that is easy to maintain and manage.

That is, the present invention is characterized in that a pressure relief plate is provided on the front side of the oil level gauge, which is airtight, transparent, and breaks at a predetermined pressure through a gas reservoir chamber that communicates with the gas chamber in the expansion cylinder. That is.

The present invention will be explained below based on the illustrated embodiments. FIG. 3 shows an embodiment of the invention. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, a pressure relief plate 10 is provided on the front surface of the oil level gauge 7, which is airtight and transparent through a gas reservoir chamber 9 that communicates with the gas chamber 8 in the expansion cylinder 1, and which breaks at a predetermined pressure. Ta. By doing this, the oil amount and internal pressure can be monitored together, and a bushing that is easy to maintain and manage can be obtained.

That is, a pressure relief plate 10 was fixed to the front surface of an airtight oil level gauge 7 fixed to the expansion cylinder 1 by a stopper 11 with a gasket 12 interposed therebetween by a presser metal fitting 13. This pressure relief plate 1
0 was made of an insulating material through which the oil level gauge 7 could be seen, and its thickness was such that it would break at a predetermined pressure. A gas reservoir υ chamber 9 having a predetermined volume and communicating with the gas chamber 8 of the expansion cylinder 1 through a connecting pipe 14 is provided between the oil level gauge 7 and the pressure relief plate 10. By doing this, the oil level gauge 7 can be monitored via the pressure relief plate 10, and if the insulating gas from the equipment side leaks into the bushing and the internal pressure of the bushing becomes excessive, The pressure relief plate 10 is destroyed via the connecting pipe 14 and the gas reservoir chamber 9, and the internal gas can be released to the outside. In this way, abnormal pressure can be released to the outside without leaking the insulating oil 6af inside the bushing to the outside, allowing equipment to continue operating without stopping even during operation, and preventing insulating gas from entering. Since the pressure relief plate 10 breaks and releases the internal pressure not only when an insulation failure occurs inside the bushing, but also when an insulation failure occurs inside the bushing, damage caused by flying insulator tubes can be prevented.

As described above, the present invention enables monitoring of oil quantity and internal pressure for abnormalities at the same time, which makes maintenance and management easier. You can get easy bushing.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the mounting state of a conventional bushing, Fig. 2 is a front view showing the mounting state of another example of the conventional bushing, and Fig. 3 is a front view showing the mounting state of the bushing of the present invention. FIG. 3 is a longitudinal sectional side view of the vicinity of the oil level gauge of the embodiment.

Claims (1)

[Claims] 1. A bushing comprising an expansion tube, an insulator tube, and a support fitting, and in which the expansion tube is provided with an oil level gauge, in which a gas chamber is provided in front of the oil level gauge and communicated with a gas chamber within the expansion surface. A bushing characterized by being provided with a pressure relief plate that is airtight and transparent through a reservoir chamber, and that breaks at a predetermined pressure.