JPH06162848A - Bushing with abnormality detecting device - Google Patents

Abstract

PURPOSE:To easily detect in a short time an inside abnormal condition at the installation place of a bushing. CONSTITUTION:A telescopic detecting body 16, composed of a bellows expanding and contracting following the inside pressure variation of a bushing main body 1, is protrudedly provided on the outer periphery of a bushing main body 1 in a bushing composed by enclosing insulating oil O in the bushing main body 1. A measuring body 21 is arranged corresponding to the telescopic detecting body 16 for measuring the telescopic condition of the telescopic detecting body 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing provided in a lead-out portion of a transformer or a switch, and more particularly to a bushing with an abnormality detecting device capable of detecting an abnormality inside.

[0002]

2. Description of the Related Art Generally, in this type of bushing, insulating oil is enclosed in the bushing body to ensure internal insulation and to prevent deterioration of the insulating oil due to ingress of oxygen and moisture in the outside air. An inert gas is filled at a pressure of about 1.0 atm. In the conventional bushing, when detecting an internal abnormality, the insulating oil is taken out from the inside of the bushing body, the gas dissolved in the insulating oil is analyzed by gas chromatography, and the electrical characteristics of the insulating oil are measured. Was.

[0003]

However, since the dissolved gas analysis of the insulating oil and the measurement of the electrical characteristics of the conventional bushing cannot be performed immediately at the location where the bushing is installed, it is troublesome and troublesome. However, there was a problem that it took time to output the results of analysis and measurement.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is to easily and easily detect an internal abnormal state at a place where a bushing is installed. An object of the present invention is to provide a bushing with an abnormality detection device that can detect time.

[0005]

In order to achieve the above object, according to the present invention, a bushing body is filled with insulating oil, and an inert gas is press-fitted into a space above the bushing body. In the above, on the outer circumference of the bushing main body, an expansion / contraction detection body which expands / contracts in accordance with the internal pressure fluctuation of the bushing main body is projected, and the expansion / contraction state of the expansion / contraction detection body is measured. The body is arranged.

[0006]

In the bushing with the abnormality detecting device constructed as described above, since the expansion / contraction detection body is in the extended state because the inert gas is press-fitted into the upper portion of the bushing, the expansion / contraction detection body is hermetically sealed due to a defective sealing of the bushing body. When a leak occurs,
The internal pressure of the bushing body decreases and the expansion / contraction detection body contracts. Therefore, if the contraction state of the expansion / contraction detection body is measured by the measurement body, it is possible to easily and quickly detect an abnormal decrease in the internal pressure at the location where the bushing is installed. Then, by detecting the decrease in the internal pressure, it is possible to grasp the sign of the deterioration of the bushing, and it becomes possible to implement planned replacement of the bushing in the future.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bushing with an abnormality detecting device embodying the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, the bushing body 1 is mounted on a mounting base 2 and is connected to a lower porcelain bushing 3 in the mounting base 2. The bushing main body 1 includes a flange metal fitting 5 fixed on a mount 2 by a plurality of bolts 4, an upper porcelain tube 7 connected to the flange metal fitting 5 via a gasket 6, and a gasket on the upper porcelain insulation pipe 7. And an expansion chamber 9 connected to each other via 8.

The conductor 10 is inserted in the center of the bushing body 1, and a capacitor core 11 is wound around the outer periphery thereof. The lid 12 is detachably attached to the opening of the expansion chamber 9 via a gasket 14 by a plurality of bolts 13, and an insertion hole 15 for inserting the conductor 10 is provided at the center thereof. The insulating oil O is housed in the bushing body 1, and an inert gas G such as nitrogen gas is sealed in the upper part of the bushing body 1 at a pressure of about 0.5 to 1.0 atmosphere.

As shown in FIGS. 1 and 2, the expansion / contraction detecting member 16 made of a bellows is mounted on the mounting plate 17 at the base end by a plurality of bolts 18 on the outer periphery of the flange fitting 5 of the bushing body 1 via a seal ring 19. Fixed by protruding,
The inside thereof communicates with the inside of the bushing body 1 through the communication port 20. The spring constant of the bellows is set so as to be in a constant expanded state by the pressure of the insulating oil O. The measuring body 21 is disposed on the upper surface of the flange portion of the flange fitting 5 corresponding to the expansion / contraction detecting body 16, and a scale for measuring the expansion / contraction state of the expansion / contraction detecting body 16 due to the internal pressure fluctuation of the bushing body 1 is arranged on the upper surface. 22 is provided.

Next, the operation of the bushing with an abnormality detecting device constructed as described above will be described. In the bushing of this embodiment, if the gasket 14 has a poor sealing due to deterioration or the like, airtight leakage occurs in the bushing body 1 and the internal pressure of the bushing body 1 decreases. Then, when the internal pressure decreases, the expansion / contraction detection body 16 that was normally in the expanded state is contracted to a length corresponding to the decrease in the internal pressure.

Therefore, if the contraction state of the expansion / contraction detecting body 16 is measured by the scale 22 of the measuring body 21, it is possible to easily and quickly detect an abnormal decrease in the internal pressure at the location where the bushing is installed. . Then, by detecting this decrease in internal pressure, it is possible to grasp the signs of deterioration of the bushing, and it becomes possible to carry out planned replacement of the bushing and planned oil collection analysis in the future. Moreover, since the expansion / contraction detection body 16 is composed of a bellows, the structure is simple and the cost can be reduced.

The present invention is not limited to the structure of the above-described embodiment, and may be embodied by arbitrarily changing the structure of each part, for example, within the scope not departing from the gist of the present invention as follows. . (A) Providing the expansion / contraction detection body 16 on the outer periphery of the expansion chamber 9. (B) Attaching and fixing the measuring body 21 to the mounting plate 17. (C) Attaching the measuring body 21 to the tip of the expansion / contraction detecting body 16 and detecting that the measuring body 21 is separated from the mounting plate 17. (E) When the expansion / contraction detection body 16 contracts beyond a predetermined value, an alarm lamp, an alarm buzzer or the like is activated via the detection switch.

[0014]

Since the present invention is configured as described above, it has an excellent effect that an internal abnormal state can be detected easily and in a short time at the location where the bushing is installed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of a bushing with an abnormality detecting device embodying the present invention.

FIG. 2 is a partial cross-sectional view showing an enlarged part of the bushing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bushing main body, 5 ... Flange metal fittings, 7 ... Upper insulator pipe, 9 ... Expansion chamber, 16 ... Expansion / contraction detection body, 21 ... Measuring body, O
… Insulating oil.

Claims (1)

[Claims] 1. A bushing in which an insulating oil is enclosed in a bushing body and an inert gas is press-fitted into a space in an upper part of the bushing body. A bushing with an anomaly detection device, characterized in that an expansion / contraction detection body that expands / contracts with it is provided in a protruding manner, and a measurement body is arranged corresponding to the expansion / contraction detection body to measure the expansion / contraction state of the expansion / contraction detection body.