JPS62203069A - Withstand voltage tester - Google Patents

Abstract

PURPOSE:To prevent the scaling-up of a tester and to facilitate the matching of the tester with an electric device to be tested, by arranging the operation mechanism of a movable contact to the outside of the container of the tester. CONSTITUTION:Mount holes 218 for mounting movable contact operation shafts are provided to the lid plate 206 of the container 200 of a tester at 120 deg. intervals in three-phase frequency dividing directions. A movable contact 236 is mounted to a charging movable conductor 234 of each phase and a movable electrode 240 opening and closing a portion between the center conductor 216 of a bushing 210 and the part to be charged of an electric device is constituted of the movable conductors 234 and the movable contacts 236. Further, a toggle mechanism is constituted of a guide block 225, a guide shaft 231, a rotary block 230 and a spring 232 and the operation mechanism of the contacts 236 is constituted of the toggle mechanism and an operation handle 223. Then, the lower end contact 235 of the conductor 234 is contacted with a part 30 or 31 to be charged in such a state that the container 7 of an electric device to be tested is mounted to the tester.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a container of an electrical device under test when conducting a withstand voltage test of an electrical device such as a gas insulated switchgear, a gas insulated transformer, or a gas insulated cable. This relates to a withstand voltage testing device that is installed and used.

[Prior Art] Electrical devices to which high voltage is applied, such as gas-insulated switchgear, are always subjected to a withstand voltage test when shipped from a factory and when installed on site. The withstand voltage test of gas-insulated switchgear involves applying an AC test voltage to the circuit breakers, disconnectors, and other component devices to withstand the voltage of the component wires, and applying a DC test voltage to the cable through the cable head. When performing these tests, a withstand voltage test device is attached to the container of the gas-insulated switchgear, and a test voltage is applied to the energized part through the test device. Ru.

A withstand voltage test device consists of a test device container that is attached to the container of the electrical device under test when performing a test, a bushing for applying a test voltage attached to this test device container, and a conductor of the bushing for applying a test voltage. and a energized part provided in the container of the electrical device under test, and a disconnection position that disconnects the conductor of the bushing from the energized part. It is composed of a movable contact 1~ and an operating mechanism for operating this movable contact. The operation mechanism of the movable contact is composed of an operation lever, a link, a rond, etc., but in conventional devices of this type,
For example, as seen in Japanese Utility Model Publication No. 56-50463, the operating structure and movable contacts were housed in a test equipment container.

[Problems to be Solved by the Invention] As described above, when the operating mechanism of the movable contact is housed in the test equipment container, the operating mechanism having many protrusions and corners will interfere with the electric field inside the test equipment container. In order to prevent this from disturbing the dielectric strength and reducing the dielectric strength, it was necessary to provide a large-diameter shield within the test equipment container to cover the operating structure. Therefore, there was a problem in that the distance between the phases of the testing device became large, resulting in an increase in the size of the device. Furthermore, since the phase-to-phase distance of the test device and the phase-to-phase distance of the electrical device under test are different, there is also the problem that it is difficult to match the test device and the electrical device under test.

An object of the present invention is to provide a withstand voltage testing device that solves the above problems.

[Means for Solving the Problems] The present invention provides an electrically charged section 30 (or 3
1), a test equipment container 200 that is connected to a three-phase electrical device under test in which is housed, a test voltage application bushing 210 attached to the test equipment container 200, and a conductor 216 of the test voltage application bushing 210. movable electrodes for three phases that can be displaced between a energizing position that connects the conductor of the bushing and the energized part and a disconnection position that disconnects the conductor of the bushing and the energized part; A withstand voltage testing device equipped with an operating mechanism for operating the movable contact 236 is characterized in that the operating mechanism for operating the movable electrode is disposed outside the test device container.

[Operation of the invention] As described above, when the operating mechanism of the movable contact is placed outside the test equipment container, there is no need to provide a large diameter shield inside the test equipment container, so the phase pressure inside the test equipment becomes [ can be set in the same way as the interphase distance of the electrical device under test. Therefore, it is possible to prevent the test device from increasing in size, and it is possible to easily match the test device and the electrical device under test.

Example The present invention will be described in detail below with reference to the accompanying drawings.

First, with reference to FIGS. 5 to 8, an example of an electrical device requiring a withstand voltage test and an example of how to attach a test device to the electrical device will be described.

FIG. 5 shows a gas-insulated switchgear as an example of an electrical device that is subjected to a withstand voltage test using the apparatus of the present invention. A circuit breaker element E1 houses a circuit breaker CB therein, and a circuit breaker element E houses a circuit breaker DS1 inside a metal container 3 connected to a metal container 2 via an insulating spacer S.
2, a connecting element E3 containing a connecting conductor in a metal container 4 connected to the metal container 3 of the disconnector element E2 via an insulating spacer S, and a metal connected to the metal container 4 via an insulating spacer S. A transformer element E4 in which a voltage transformer VT is housed in a container 5, and a cable head in which a cable head CHd is housed in a metal container 7 connected to the container 4 via an insulating spacer S and supported on a pedestal 6. A current transformer CT1 is installed in a metal container 8 connected to the element E5 and the circuit breaker element E1 via an insulating spacer S.
and a current transformer element E containing the through conductor of the current transformer.
6, and a disconnector element E in which the new circuit 3DS2 is housed in a metal container 9 connected to the container 8 via an insulating spacer S.
7, a voltage detection device element E8 housing a voltage detection electrode ED in a metal container 10 connected to the metal container 9, and a bus bar BUS in a metal container 11 connected to the metal container 9 via an insulating spacer S. Bus bar element E9 containing
Each metal container is filled with SF6 gas at a predetermined pressure. The (mains) in each element are connected to the equipment of the adjacent element through the d conductor of the insulating spacer S, and from the cable pen Cl-1d to the bus bar BU.
A predetermined switching circuit leading to S is configured. A cable C raised from an underground cable pit is connected to the cable pend CHd of the cable head element E5, and a current transformer CT2 is also attached to this cable C.

When performing the withstand voltage test of the gas insulated switchgear, the withstand voltage test device 2 is attached to the container 7 of the cable head element E5.
0 is attached. Referring to FIG. 6, the internal structure of the cable head element E5 is shown, and in this example, the metal container 7 consists of a vertically elongated cylindrical container. Nozzles 7a and 7 protrude forward and backward on the side surface of the upper end of the metal container 7.
b is provided, and the nozzle stub 7a on the front side is connected via an insulating spacer S to the container 4 of the connecting element E3. Three-phase cable heads CHd are attached to a bottom plate 21 attached to airtightly close the lower end opening of the container 7, and each cable head is connected to an end portion 22 of a cable raised from underground. The terminal conductor 23 of the cable head CHd is connected to the connecting conductor 26 in the connecting element 3 via the connecting conductor 24 and the through conductor 25 of the insulating spacer S.
It is connected to the. On the nozzle stand 7b on the back side of the container 7! 2
7 is attached, and on the inner surface of this lid is an adsorbent container 2 containing an adsorbent that adsorbs moisture and decomposition products in SF6 gas.
8 is installed. The upper end opening 7C of the container 7 is an opening for connecting a withstand voltage testing device, and this opening 7C is normally closed by a removable lid plate 29.

At the time of the withstand voltage test, the lid plate 29 is removed and the withstand voltage test device 20 of the present invention is attached to the opening 7C as shown in FIG. 7 or 8.

Figure 7 shows a state in which an AC test voltage is applied to the components of a gas-insulated switchgear to perform a withstand voltage test.
In this case, L is connected to the through conductor 25 of each phase of the insulating spacer S.
A letter-shaped conductor 30 is connected. One side 30A of the conductor 30 of each phase is arranged parallel to the axis of the container 7, and the tip 30a of the negative side is directed toward the test apparatus 20 side. Then, the lower end of the movable electrode 240 of the withstand voltage test device 20 is brought into contact with the tip 30a of the conductor 30 of each phase, and the AC test is performed on the component of the gas insulated switchgear through the movable electrode 24 from the center conductor of the bushing 210 of the test device 20. A voltage is applied.

FIG. 8 shows a state in which a cable withstand voltage test is performed by applying a DC test voltage from the testing device 20 to the cable C through the cable head CHd. In this case, the cable head CHd of each phase is The lower ends of rod-shaped conductors 31 extending in the axial direction inside the container 7 are connected, and the upper ends 31a of the rod-shaped conductors 31 of each phase are oriented toward the test apparatus 20 side.

The movable electrode 24 of each phase of the testing device is brought into contact with the upper end of the bar-shaped conductor 31 of each phase, and a DC test voltage is applied from the testing device 20 to the cable of each phase through the conductor 31 and the cable head CHd.

Next, an example of the configuration of the test apparatus 20 will be described with reference to FIGS. 1 to 4.

FIG. 1 and FIG. 2 are a perspective view and a longitudinal cross-sectional view, respectively, showing an embodiment of a test device 20 of the present invention. In these figures, 200 is a test equipment container, and this test equipment container includes a cylindrical first container 203 having flanges 201 and 202 at the upper and lower ends, respectively, and a port 1 on the flange 201 at the upper end of the first container. ~204 and Natsuto 205
It consists of a lid plate 206 attached to the lid plate 206, and a tubular second container 208 whose lower end is joined to the periphery of an opening 207 provided in the center of the lid plate 206.

A flange 209 is provided at the upper end of the second container 208, and this flange 209 has a bushing 2 for applying a test voltage.
A flange 211 at the lower end of 10 is connected by bolts 212 and nuts 213.

The bushing 210 includes a sleeve 214 made of an insulator, a terminal plate 215 attached to the upper end of the sleeve 214, and a terminal plate 215 attached to the upper end of the sleeve 214.
15, and a center conductor 216 whose upper end is connected to the first container 203, and the lower end of the center conductor 216 extends to near the lower end of the first container 203. from the lower end of the bushing 210 to the first container 2
A cylindrical shield 217 is provided near the upper end of the bushing 03, and this shield 217 serves to alleviate the electric field around the inner center conductor near the connection between the bushing and the test equipment container.

The lid plate 206 of the test equipment container 200 is provided with holes 218 for three phases at 120 degree intervals in the circumferential direction for mounting the movable contact operating shaft. A guide bush 219 is fitted into the guide bush 219 . A flange 220 is provided at the lower end of each guide bushing 21, and this flange 220 connects one plate to the other via a packing.
The cover plate 20 is brought into contact with the lower surface of the cover plate 20 by bolts 221.
6 is hermetically connected. The operation shaft 222 of each phase is fitted into the inner circumference of each guide bush 219, and the operation @22
2 and the inner periphery of the guide bushing 219, a gasket is provided to maintain the airtightness of the penetrating portion of the operating shaft 222.

One end of an operating handle 223 is fixed to the upper end of the portion of the operating shaft 222 of each phase that protrudes upward from the guide bushing 219, and a shaft support plate 224 is fixed to a portion located below the operating handle 223. . Operation handle 2
23 and the shaft support plate 224 is a guide block 225.
are arranged, and shafts 226 and 227 that protrude vertically from the guide plotter are rotatably fitted into bearing holes provided near the base of the shaft support plate 224 and the operating handle 223, respectively.

Near the outer periphery of the top surface of the cover plate 206, each phase operation@22
Fixed shafts 229 are attached corresponding to the fixed shafts 2, and a rotary block 230 is rotatably supported on each fixed shaft. One end of a guide rod 231 is fixed to this rotating block 230, and the other end of this guide rod is fixed to a guide block 225.
It is slidably fitted into a through hole provided in the. A spring 232 is provided along the guide rod 231 and is disposed in a compressed state between the rotation block 230 and the guide block 225.

The upper end of an insulated operating shaft 233 made of an insulating material is connected to the lower end of the operating shaft 222 of each phase, and the movable conductor 234 for charging of each phase is connected to the lower end of this insulated operating shaft 233.

A contact 235 biased downward by a spring is attached to the lower end of the movable energizing conductor 234, and when the test device is attached to a gas-insulated switchgear, the energizing conductor 23 of each phase
Contactors 1 to 4 provided at the terminal 4 are arranged to abut the upper end 30a of the conductor 30 of each phase shown in FIG. 7 or the upper end 31a of the conductor 31 of each phase shown in FIG.

A movable contact 236 is provided on the movable conductor 234 for charging each phase.
is attached, and the movable conductor 234 and the 1■ movable contact 23
6 constitutes a movable electrode 240 that opens and closes between the center conductor 216 of the bushing 210 and the charged portion of the electrical device.

The above test device has a flange 2 at the lower end of the container 200.
02 is attached to the upper end opening 7C of the cable head container 7 of the gas insulated switchgear as the electrical device under test by connecting it with a bolt 241 and a nut 242,
With the test device installed in this way, the contact 235 at the lower end of the movable conductor 234 of the movable electrode 240
0a or 31a. The inside of the test equipment container 200 forms a common gas space with the inside of the cable head container 7, and this gas space is filled with S[6 gas at a predetermined pressure.

In this embodiment, the positional relationship between the operating handle 223, the movable contact 236, and the guide shaft 231 is set as shown in FIG. 4. The guide block 225, the guide shaft 231, the rotation block 230, and the spring 232 constitute a 1-toggle (a number of toggles 11N 41, and the toggle 11N 41) and the handle 223 constitute a movable contact operating mechanism.

In a3 of the present invention, this operating mechanism is the test device container 20.
0, and only the insulating operation @ 233 and the movable electrode 240 are arranged inside the test device container 200.

In addition, in this embodiment, as shown in FIG. 3, a lifting fitting 246 for hooking a crane hook 245 is attached to the terminal plate 215 of the bushing 210, and the crane hook is hooked to this lifting fitting. It is now possible to lift.

When the operating handle 223 is rotated clockwise from the position shown by the chain line in FIG.
When the center axis of the handle 223 exceeds a neutral position where the center axis of the handle 222 coincides with the center of the operating shaft 222, the operating handle 223 is biased clockwise by the spring 232. As the operating handle rotates, the movable contacts 236 rotate clockwise, and move to the energized position where the movable contacts 1 to 236 contact the center conductor 216 of the bushing, as shown by the solid line in FIG. ) Then the operation handle will stop. In this state, the movable contact 236 is pressed against the conductor 216 of the ribbing by the biasing force of the spring 232 and is held in contact with the conductor 216. Then, the center hollow 216 of the bushing 210 passes through the movable contact 236 and the movable energizing conductor 234 to the energized part of the electrical device (the upper end of the conductor 30 in FIG. 7 or the upper end of the conductor 31 in FIG. 8). The test voltage is applied to the energized part.

Next, when the operating handle 223 is rotated counterclockwise from the position shown by the solid line in FIG. When the neutral position corresponding to the center of the shaft 222 is exceeded, the operating handle 223 is biased counterclockwise by the spring 232. When the movable contact 236 reaches the disconnection position where it contacts the ground terminal 237, the operating handle 223 stops. In this state, the movable contact 236 is held in contact with the ground terminal 237 by the biasing force of the spring 232.

In the above description, it is assumed that a gas insulated switchgear is tested, but the present invention can be applied to testing any electrical equipment that requires a withstand voltage test, such as transformers and cables. Further, the electrical equipment to be subjected to the withstand voltage test is not limited to those using gas as an insulating medium, and the present invention can also be applied to testing electrical equipment using an insulating medium such as aburakasa.

[Effects of the Invention] As described above, according to the present invention, since the operation mechanism of the movable contact is arranged outside the test equipment container, there is no need to provide a large diameter shield inside the test equipment container. The phase-to-phase distance within the test equipment can be set similarly to the phase-to-phase distance of the electrical device under test. Therefore, it is possible to prevent the test device from increasing in size, and it is possible to easily match the test device and the electrical device under test.

[Brief explanation of drawings]

Figures 1 and 2 are a perspective view and a vertical cross-sectional view of an embodiment of the present invention, Figure 3 is a perspective view showing the vicinity of the terminal plate of the bushing for applying a test voltage, and Figure 4 is the operating mechanism. FIG. 5 is a schematic configuration diagram showing an example of the configuration of a gas-insulated switchgear as an example of an electrical device to which the test device of the present invention is attached, and FIG. Longitudinal cross-sectional view of the attached element, Figures 7 and 8
The figures are longitudinal cross-sectional views showing a state in which an AC withstanding voltage test of the constituent elements of a gas-insulated switchgear and a DC withstanding voltage test of a cable are conducted, respectively. DESCRIPTION OF SYMBOLS 20... Withstand voltage test device, 200... Test device container, 210... Bushing, 216... Center conductor of bushing, 222... Operating shaft, 223... Operating handle, 231... Guide shaft, 232... Spring, 23
3... Insulated operation shaft, 234... Movable conductor, 236...
...Movable contact, 240...Movable electrode, 30a,
Job...Electrified section. @1 Figure 3 Figure 6 Figure i @7 Figure 8

Claims (2)

[Claims] (1) a test equipment container that is connected to a three-phase electrical device under test in which an insulating medium is sealed and a energized part is housed; a bushing for applying a test voltage that is attached to the test equipment container;
3 which is movable between an energizing position where the conductor of the test voltage energizing bushing and the energized part are connected and a disconnection position where the conductor of the bushing and the energized part are separated; A withstand voltage test device comprising movable electrodes for each phase and an operation mechanism for operating the movable electrodes for each phase, characterized in that the operation mechanism is disposed outside the test device container. . (2) The movable electrode is supported by the test device container via the insulated operating shaft, and is electrically operated by the operating mechanism to rotate via the insulated operating shaft while in contact with the energized portion. and a movable contact that is attached to the movable energizing conductor and is displaced between a position in contact with the center conductor of the bushing and a position spaced apart from the center conductor of the bushing. The withstand voltage test device according to scope 1.