JPS58186062A - Charging terminal of withstand voltage testing device in gas insulation switch gear - Google Patents

Abstract

PURPOSE:To simplify the work, by installing an insulating cylinder having an air insulating distance being endurable against test voltage, to one end of an insulating electric conductor rod which exposes an adjacent electric conductor of both ends, and installing a stress cone to the other end. CONSTITUTION:A charging terminal 30 of withstand voltage testing device in a gas insulation switch gear is formed by a short CV cable 31 whose both ends are step-peeled, an insulating cylinder 32 having an air insulating distance being endurable against test voltage, which is installed to one end of this CV cable 31, a stress cone 33 having a round tip-like tapered face on the tip, consisting of an insulator having rubber-like elasticity, for instance, ethylene propylene rubber, which is installed to the other end, etc. According to such a constitution, it becomes possible to easily impress the test voltage from the outside without being accompanied by a disassembling work, etc. at every test, and the work is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a charging terminal for a withstand voltage testing device for gas-insulated switchgear.

[Technical Background of the Invention] Conventionally, gas insulated switchgear has been assembled and installed on the main body of the gas insulated switchgear and after the test adjustment has been completed.
The assembled device was opened, the test bushing was removed, the device was reassembled, vacuum degassed, supplementary SF6 gas was filled, and the device was put into operation. These operations are repeated each time because the inspection is performed two to four times depending on the case, and it has been desired to simplify the operations.

In order to solve this problem, the present inventors have previously developed and filed a patent application for a [withstand voltage test device for gas insulated switchgear] that does not require the installation and removal of test bushings each time a test is performed.

FIG. 1 and FIG. 2 show cross-sectional views of this withstand voltage testing device. To explain the diagram, gas insulated switchgear 1
, a connection case 2 filled with insulating gas is provided on the connection side with the transformer, a bushing pocket 4 of the transformer is connected to the bottom surface of this case 2 via a partition plate 3, and the partition plate 3 is inserted. Oil-gas bushings 5 for three phases of the transformer are installed.

The bushing 5 of each phase has a connecting conductor 6 extending vertically to the gas side terminal, and a conductor 7 extending from the open circuit 1 is connected to the connecting conductor 6. The phase connection conductors 6 are provided with test terminals 6a formed at the upper end so as to have the same height.

8 is an upper cover of the connection case 2, and 9 is a cable connecting device that is attached to the upper cover 8 and is detachable from the test cable 10 that is inserted from the outside. As shown in FIGS. 3 and 4, the cable connection device 9 includes a rod 12 that is gas-tightly attached to the back side of the opening 8a of the upper cover 8 and is movable in an airtight state inside an insulating tube 11. A contactor 13 is attached to one end of the rod 12, and a dish-shaped contact plate 14 is supported at the other end. When the test cable 10 is inserted from the outside, the rod 12 automatically connects to the cable terminal 15 via the contactor 13 at a predetermined lowered position as shown in FIG. Press the test terminal 6a. Set up this test terminal 6a ()
Connect the internal circuit to the external test power supply. When the test cable 10 is in the inserted state, the opening 8a of the cover 8
is closed by a jacket 16.

Insulation of the cable end portion within the jacket 16 is ensured by the insulating collar 18 pressurized by the spring 17 coming into pressure contact with the inner surface of the insulating cylinder 11.

On the other hand, after the test cable 10 is pulled out after the pressure test, the rod 12 is attached to the threaded hole at its end from above and pulled up to a predetermined raised position by the +1 stud 19, as shown in FIG. It is supported in that position via a spring 21 by an insulating stand 20 inserted in advance into the opening 8a, and is installed at the same potential as the cover 22 via an installation member such as a spring 23 in the cap 22 attached to the opening 8a. Ru. The contact plate 14 is separated from the test terminal 6a by the movement of the rod 12 to the raised position and is held at a position where a predetermined insulation distance is maintained.

According to the above configuration, during a withstand voltage test, the internal space of the switchgear can be opened to the atmosphere by inserting the test cable 10 from the outside into the cable connection device 9 provided in the gas-insulated switchgear 1. (It can be automatically connected to the test terminals 6a for three phases of the internal circuit through the rod 12 and contact plate 14 of this cable connection device 10 while maintaining a gas-tight state. Therefore, gas refilling is not required as in the conventional case. No processing work is required, and the work is simple and allows for quick pressure tests.In addition, after the pressure test, the test cable 1
Even after pulling out the switchgear 0, the rod 12 is pulled up to a predetermined position and grounded without exposing the switchgear to the atmosphere, so that the connection plate 14 also rises to the ground potential and the test terminal 6a
Since it opens at a position where a predetermined insulation distance is maintained between the two and the two, the operating state can be quickly switched to without interfering with steady operation.

[Problem with back head technology 1 However, this withstand voltage testing device had a drawback in that the test cable 10 used for charging the voltage was as long as 30 to 50 m, making it complicated to transport and handle. In particular, since this withstanding voltage testing device is almost always outdoors, there is no restriction on isolation from live parts, so it has been desired to develop a charging terminal that can directly apply electricity to this withstanding voltage testing device.

[Summary of the Invention] The present invention has been made to address this problem, and includes an insulating cylinder having an air insulation distance that can withstand the test voltage, attached to one end of an insulated conductor rod with conductors near both ends exposed. , a stress cone having a conical tapered surface is attached to the tip formed of an insulator having rubber-like elasticity at the other end, a suppression fitting is fixed to the rear of this stress cone, and further attached to the rear of this pressing fitting. A cylindrical holding fitting having a flange is loosely inserted therein, and a spring is inserted between the pressing fitting and the holding fitting.

[Embodiment of the Invention] The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 5 is a partial cross-sectional view of one embodiment of the present invention.

The power supply terminal 30 for withstand voltage test H-graph of gas insulated switchgear in this embodiment is a short Cv cable (cross-linked polyethylene insulated vinyl chloride resin sheathed cable) 31 with steps stripped at both ends.
An insulating cylinder 32 having an air insulation distance that can withstand the test voltage is attached to one end of the Cv couple 31, and an insulator having rubber-like elasticity, such as a tip made of ethylene propylene rubber, is attached to the other end. A pressure fitting 34 having a stress cone 33 and a flange 34a fixed to the back surface of the stress cone 33.
A cylindrical holding fitting 35 having a mounting flange 35a loosely inserted into the rear of the suppressing fitting 34, and a spring 36 inserted between the suppressing fitting 34 and the holding fitting 35 form the main body thereof. There is.

A conductive plug 38 is fitted to one end of the exposed conductor 37 at both ends of the Cv cable 31, and a conductor bar 39 is connected to the other end. Center (insulating tube 32 and stainless steel tube 3)
3) may be replaced with an insulated conductor rod coated with an epoxy resin, for example.

The insulating tube 32 is provided with an insertion hole having a diameter slightly larger than the outer diameter of the insulator 36 of the Cv cable 31 in the longitudinal direction, and a pleat 37 is formed on the outer periphery to increase the creepage distance. The entire unit is integrally molded from ethylene propylene rubber.

This insulating cylinder 32 is made of Cv coated with an insulating compound.
A semiconductive self-fusing tape 52 is wound from the copper tape shielding layer 38 of the Cv"-pull 31 onto the conical tapered surface provided at the base of the cable 31, and is fitted over the insulator of the cable 31, and the semiconductive self-fusing tape 52 is wound around the copper tape shielding layer 38 of the Cv"-pull 31. A waterproof protective layer 40 is formed from the sheath 53 of the cable 31 to the root of the lowest pleat by insulating self-fusing tape and adhesive vinyl tape.

The stress cone 33 is formed by integrally molding a bell mouth 41 on the back, and this bell mouth 41 is
It is fitted onto the insulator of the Cv cable 31 so as to be electrically connected to the semiconductive layer 42 of the V cable 31. Note that the insulating cylinder 32 and the stress cone 33 may be formed directly on the insulator of the Cv cable 31 using a mold.

A plurality of guide bolts 43 each having a spring 36 loosely fitted therein are erected on the same circumference at equal intervals on the seven flange 34a of the suppressing metal fitting 34, and these guide bolts 43 are fixed inside the holding metal fitting 35. A guide hole 45 is drilled in the provided kite plate 44 to correspond to the guide bolt 43.
It is loosely inserted into. 46 is a grounding wire that electrically connects the copper tape shielding layer 38 of the Cv cable 31 and the guide plate 44.

A waterproof backing 47 is fitted to the upper inner periphery of the holding fitting 34, and a cable clamp 48 is further fitted behind the holding fitting 35 to be engaged with the holding fitting 35. Reference numerals 49 and 50 are a fixed terminal and a windmill voltage detector respectively attached to the conductor bar 39, and 51 is a protective cap that is fitted over the entire stress cone 33 when not in use and is fixed to the flange of the holding fitting 34. .

Next, a method of using the charging terminal of the present invention will be explained. A withstand voltage testing device for a gas insulated switchgear using this charging terminal connects the stress cone 33 to the cable connecting device 9 of the withstanding voltage testing device shown in FIGS. 1 to 4. Since they have the same structure except for possible configurations, in the following description, the configuration of the withstand voltage testing apparatus in which the energizing terminal of the present invention is installed will be explained using FIGS. 1 to 4.

First, when using the energizing terminal of the present invention, the protective kit 51 is removed, and the stress cone 33 is inserted into the insulating tube 11 in FIG. 4 with the entire terminal in a vertical position. When the stress cone 33 is inserted into the insulating cylinder 11, the conductive plug 38 is automatically connected to the contact 13 at a predetermined lowered position, and at the same time, the contact plate 14 is pressed into contact with the test terminals 6a for three phases. When the flange 34a of the press fitting 34 is bolted to the upper cover in this state, the conical taper T on the front surface of the stress cone 33 is pressed against the inner surface of the insulating tube 11 by the spring 36, thereby ensuring insulation.

On the other hand, after the energizing terminal is pulled out after the withstand voltage test, the procedure is carried out in the same manner as in the conventional case, as shown in FIG.

[Effects of the Invention] As explained above, the power supply terminal for the withstand voltage test device for gas-insulated enclosures of the present invention allows the test voltage to be easily applied from the outside without requiring disassembly work each time a test is performed. It is possible to quickly switch to operating status after testing.
In particular, since there is no need for test cables and only small pumice stones are used, assembly and disassembly during testing becomes easier.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a conventional withstand voltage test device for gas-insulated switchgear, FIGS. 3 and 4 are enlarged cross-sectional views showing the state in which it is used, and FIG. FIG. 3 is a partial cross-sectional view of the embodiment. 31・・・・・・・・・CV cable 32...
......Insulating tube 33...Stress cone 34...
・・・・・・・・・Press metal fitting 35・・・・・・・・・
...Holding bracket 35a...Mounting flange 36...Spring T...
・・・・・・・・・Conical Taper Agent Patent Attorney
Suyama Sa - (1 other person) 11- Figure 3 Figure 1! ``Shi-'' Procedural Amendment 1. Display of the incident Patent application No. 1983-68329 Name of the invention 1m for withstand voltage testing equipment for gas insulated switchgear! Terminal 3, Relationship with the case of the person making the amendment - Patent applicant Showa Cable Densei Co., Ltd. 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture (haka, 'Z name) 4, Agent
Address: ioi Kyodo Building (Shin-Kanda) 10, Kanda Mitoricho, Chiyoda-ku, Tokyo 1!103(254) 1039
(7784) Patent Attorney Suyama Sa -5, Date of amendment order 6, Detailed explanation of the invention in the specification subject to amendment ゛ -1 Column 7, Statement of contents of amendment, page 5, line 19 Insert the following sentence between and line 20. [Objective of the Invention] The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a charging terminal for a withstand voltage testing device for gas-insulated switchgear that is easy to transport and handle and that allows direct charging. Patent featuring

Claims (1)

[Claims] An insulated tube with an air insulation distance that can withstand the test voltage is attached to one end of the insulated conductor rod with the conductor exposed near both ends, and the other end is made of an insulator with rubber-like elasticity and has a conical taper at the tip. A stress cone having a surface is attached, a pressing metal fitting is fixed to the rear of this stress cone, and a cylindrical holding metal fitting having a mounting flange is loosely inserted behind this pressing metal fitting. A charging terminal for a withstand voltage test device for a gas insulated switchgear, characterized in that a spring is inserted in the terminal.