JPH11146544A - Power apparatus having insulating spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize cost reduction, reduce the number of manufacturing steps and improve accuracy. SOLUTION: This power apparatus comprises a shield hardware 11 embedded in an insulating spacer 3, a leading hardware 12, of which one end is connected to the shield hardware 11 and the other end is guided to the side surface of circumferential portion of the insulating spacer 3, a signal leading terminal 13 formed to the leading portion of the leading hardware 12, a cutout portion 16 formed to a flange 2 at the signal leading terminal 13, and a cable 17 connected to the signal leading terminals 13 at the cutout portion 16. During normal use, the cable 17 is connected to the ground potential portion. During detection of power, a clamp current transformer 19 or the like is inserted to the cable 17 to detect a leakage current. During the detection of electromagnetic waves due to internal partial discharge, the cable 17 is separated from the ground potential portion and is then connected to the electromagnetic wave detector for the detection of electromagnetic waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power device having an insulating spacer such as a gas-insulated switchgear, a gas-insulated bus, a transformer, a capacitor, and the like. More specifically, the flanges at the ends of two gas containers are insulated. The present invention relates to a power device having an insulating spacer connected through a spacer and having main circuit conductors located in both containers penetrating the insulating spacer.

[0002]

2. Description of the Related Art A conventional power device of this type will be described with reference to FIGS. In these figures, reference numeral 1 denotes two metal gas containers, and flanges 2 at the ends of both containers 1.
An insulating spacer 3 is interposed between them. Reference numeral 4 denotes a main circuit conductor located in both containers 1, penetrating through the insulating spacer 3 and supported by the insulating spacer 3. 5 is an insulating spacer 3
A plurality of embedding fittings penetratingly embedded in the peripheral portion of the embedding part, 6 are bottle insertion holes formed in the embedding fitting 5.

[0003] Reference numeral 7 denotes a shield metal buried in the insulating spacer 3, which is located near each main circuit conductor 4 so as to cover the container 1 side of the main circuit conductor 4. 8 is the shield hardware 7
, One end of each of which is connected to both ends of the shield metal fitting 7, and the other end of which is connected to the embedding metal fitting 5. Reference numeral 9 denotes a bottle, which is inserted through one flange 2 and screwed into the embedding fitting 5, is led out from the other flange 2, and a nut 10 is tightened.

When detecting an internal partial discharge, an antenna is attached to the outside of the container 1 near the insulating spacer 3 or inside the container 1, and the internal partial discharge is transmitted to the antenna as electromagnetic waves due to the partial discharge. Received and detected by electromagnetic wave detector.

At the time of power detection for checking the charging status, a power detection electrode is mounted in the container 1, and a leakage current is detected by a current transformer inserted into a cable connected to the power detection electrode. .

[0006]

In the case of the above-mentioned conventional power equipment, the shield metal 7 is used only for shielding, and when the internal partial discharge is detected as an electromagnetic wave by an antenna, the shield metal 7 is placed outside or inside the container 1. The antenna must be mounted on the antenna, and a new antenna is required, which leads to an increase in cost and an increase in the number of mounting steps.

In order to check the charging status, a power detection electrode must be mounted inside the container 1, and a new power detection electrode is required, and a handhole for mounting the power supply to the container 1 is required. Is required, the cost is increased, and the number of mounting steps is increased.

Further, in view of the above-mentioned high cost and an increase in the number of mounting steps, the number and mounting positions of the antenna and the electrode for power detection are limited, so that there is a problem that improvement in accuracy cannot be expected.

The present invention has been made in view of the above points, and has as its object to provide a power device having an insulating spacer with reduced cost, reduced man-hours, and improved accuracy.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a main circuit conductor located in the two gas containers, wherein flanges at ends of the two gas containers are connected via insulating spacers. In a power device penetrating the insulating spacer, a shield metal buried in the insulating spacer,
One end is connected to the shield hardware, and the other end is led out to a side surface of a peripheral portion of the insulating spacer, a signal lead terminal formed in a lead portion of the lead metal, and a position of the signal lead terminal. And a cable connected to the signal lead-out terminal in the lacking portion.In normal use, the cable is connected to a ground potential portion. The cable is connected to an electromagnetic wave detector by disconnecting the cable from the ground potential part and detecting the electromagnetic wave at the time of detecting an electromagnetic wave due to internal partial discharge by inserting a clamp current transformer into the It is.

Therefore, one end of the drawer is connected to the shield metal buried in the insulating spencer, the other end of the drawer is led out to the side surface of the peripheral portion of the insulating spencer, and a signal lead terminal is formed at the lead portion. Since a cable is connected to the terminal, it is only necessary to connect the cable to the ground potential part during normal use, and at the time of power detection, insert a clamp current transformer etc. into the cable to reduce leakage current. It is possible to detect the state of charge and check the state of charge, and when detecting an internal partial discharge, the cable may be disconnected from the ground potential portion and connected to the electromagnetic wave detector, and the operation is extremely simple.

Furthermore, unlike the related art, it is not necessary to newly provide an antenna, a voltage detection electrode, and a mounting handhole, so that the cost is reduced, the number of steps is significantly reduced, and detection is performed for each insulating spacer. Possible, and the accuracy is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In each drawing, the same reference numerals indicate the same or corresponding components. (Embodiment 1) Embodiment 1 will be described with reference to FIGS.
Reference numeral 11 denotes a flat plate-type shield metal, which is positioned so as to cover the container 1 side of each main circuit conductor 4 penetrating an insulating spencer made of epoxy. Reference numeral 12 denotes an L-shaped lead metal, one end of which is connected to the center of the shield metal 11, and the other end is led out to the side surface of the peripheral portion of the insulating spencer 3, and a signal lead terminal 13 is formed at the lead part. .

Reference numeral 14 denotes two support hardwares, one ends of which are connected to both ends of the shield hardware 11. Reference numeral 15 denotes a molding agent made of an insulating material, which is embedded in the embedding metal fitting 5 of the insulating spacer 3 and the other end of the supporting metal material 14 is screwed.

Reference numeral 16 denotes a missing portion, which is a metal gas container 1.
Are formed on the flange 2 at positions corresponding to the signal extraction terminals 13. Reference numeral 17 denotes a cable having one end connected to the signal extraction terminal 13, and reference numeral 18 denotes an O-ring fitted into a concave portion of the flange 2 at a joint surface with the insulating spencer.

When the shield metal 11 is used as a normal shield, the other end of the cable 17 is connected to a ground potential portion such as the container 1.

Next, when the shield metal 11 is used as an electrode for electric detection, as shown in FIG.
The voltage is detected by inserting the clamp current transformer 19 and the like into the device and measuring the leakage current.

Further, when the shield metal 11 is used as an antenna, the other end of the cable 17 is cut off from the ground potential portion and connected to an electromagnetic wave detector (not shown) to detect electromagnetic waves due to internal partial discharge.

The signal extraction terminal 13 of the extraction hardware 12
Is a tap 19, as shown in FIG.
It is desirable that a screw 21 be inserted into the crimp terminal 20 at one end of the terminal and the screw 21 be screwed into the tap 19.

As shown in FIG. 5, a hole 22 is formed in the other end of the drawer 12, and a plug 2 at one end of the cable 17 is formed.
3 may be pressed into the hole 22.

(Embodiment 2) Embodiment 2 will be described with reference to FIGS. 6 and 7. FIG. The shield hardware 11 ′ of this embodiment is a slot type. A slot 24 is formed in the shield hardware 11 ′, and one end of each of the drawers 12 ′ and 12 ″ is connected to both sides of the center of the slot 24. ',
The signal extraction terminals 13 ′ and 13 ″ at the other end of the 12 ″ are located in the missing portion 16 of the flange 2.

When used as a normal shield, both signal extraction terminals 13 'and 13 "are connected to the ground potential portion of the container 1 or the like via cables 17' and 17", respectively.

Next, at the time of power detection, one cable 17 '
To the other cable 1
The other end of the 7 ″ is disconnected from the ground potential portion, and a leakage current is detected by the current transformer 19 or the like.

Further, when used as an antenna, the other ends of both cables 17 'and 17 "are disconnected from the ground potential portion,
Electromagnetic waves due to internal partial discharge are detected from the other ends of both cables 17 ', 17 ".

[0025]

Since the present invention is configured as described above, it has the following effects. One end of a drawer 12 is connected to a shield metal 11 buried in the insulating spencer 3, and the other end of the drawer 12 is led out to a side surface of a peripheral portion of the insulating spacer 3.
3 is formed and the cable 17 is connected to the terminal 13. Therefore, during normal use, it is only necessary to connect the cable 17 to the ground potential portion. By inserting the detector 19 etc., the leakage current can be detected to check the charging status, and when detecting internal partial discharge, the cable 17 may be disconnected from the ground potential portion and connected to the electromagnetic wave detector. , Which can make the task very simple.

Furthermore, unlike the related art, it is not necessary to newly add an antenna, a voltage detection electrode, and a mounting handhole, so that the cost is reduced, the number of steps is significantly reduced, and the detection is performed for each insulating spacer 3. And the accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part according to a first embodiment of the present invention.

FIG. 2 is a side view of the insulating spacer of FIG.

FIG. 3 is a perspective view of a shield metal part of FIG. 1;

FIG. 4 is a sectional view of a signal extraction terminal portion of FIG.

FIG. 5 is a cross-sectional view of another example of FIG.

FIG. 6 is a sectional view of a main part according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a shield metal part of FIG. 6;

FIG. 8 is a sectional view of a conventional example.

FIG. 9 is a side view of the insulating spacer of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas container 2 Flange 3 Insulating spacer 4 Main circuit conductor 11, 11 'shield hardware 12, 12' 12 "Lead hardware 13, 13 '13" Signal extraction terminal 16 Missing part 17, 17' 17 "Cable 19 Clamp current transformer

Claims (1)

[Claims] 1. A power device in which flanges at end portions of two gas containers are connected via an insulating spacer, and main circuit conductors located in the two containers penetrate the insulating spacer. A buried shield metal part, a lead metal part having one end connected to the shield metal part, and the other end led out to a side surface of a peripheral portion of the insulating spacer; a signal lead terminal formed at a lead part of the lead metal part; A missing portion formed in the flange at the position of the signal lead-out terminal; and a cable connected to the signal lead-out terminal in the missing portion. In normal use, the cable is connected to a ground potential portion, When power is applied, a clamp current transformer or the like is inserted into the cable to detect leakage current, and when an electromagnetic wave due to internal partial discharge is detected, the cable is disconnected from the ground potential part to detect electromagnetic waves. Connected to the vessel, power equipment having an insulating spacer, characterized in that to detect the electromagnetic wave.