JPH01291609A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To perform voltage withstanding test without requiring insulating gas filling work by connecting a voltage withstanding test container to a cable head container at the opposite side from a circuitbreaker and constituting a voltage applying section connectable with a voltage source in the container while furthermore constituting an externally operable connecting device in the container. CONSTITUTION:Main buses 1A, 1B are connected to one side of a circuitbreaker 2 and a cable head container 3 is connected to the other side. A voltage withstanding test container 7 is connected to the cable head container 3 at the opposite side from the circuitbreaker and conductors at the side of a cable head CH in the cable head container 3 are led into the container 7. A metering transformer 5 is connected with the voltage withstanding test container 7 and a voltage applying section 32 electrically connectable externally is constituted. The rotary shaft 9 of a connecting device 30 is led out through a bearing for allowing rotation of the rotary shaft 9 while maintaining air-tightness to the outside of the voltage withstanding test container 7. When a handle 31 is rotated, the connecting device 31 connects one random phase conductor with a voltage source through a cable 33 and grounds two other phases.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gas insulated switchgear, and more particularly to a three-phase bracket type gas insulated switchgear having a voltage application section for withstanding voltage testing.

[Prior Art] Generally, gas-insulated switchgear is constructed by storing a energized cloth conductor in a container filled with an insulating gas, so after installation, a withstand voltage test is performed in which a predetermined voltage is applied to the energized cloth conductor. It is necessary to take into account the voltage application section for use in manufacturing.

For example, in the gas insulated switchgear shown in FIG. 10, a withstand voltage test is conducted as shown in FIGS. 11 and 12.

The gas insulated switchgear shown in Fig. 10 connects the main buses IA and IB with built-in bus-side disconnectors to one side of the circuit breaker 2, and electrically connects the bus conductors of these main buses to one terminal of the interrupting part. Connected. A cable head container 3 containing a line-side disconnector is connected to the other side of the circuit breaker 2, and the line-side disconnector is electrically connected to the other terminal of the interrupter. Furthermore, an instrument transformer 5 and a lightning arrester 6 are connected to the cable head container 3 via a disconnection container 4 .

Since the gas-insulated switchgear with such a configuration does not have a voltage application part for withstanding voltage tests, the disconnection part container 4, the voltage transformer 5, and the lightning arrester 6 are removed and the test After installing the bushing 12 and applying a predetermined voltage from the test bushing 12, or after removing the disconnection container 4, the voltage transformer 5, and the lightning arrester 6 as shown in FIG. was attached, and a predetermined voltage was applied from this test cable pen 13. In any case, after the withstand voltage test, remove the test bushing 12 or the test cable head 13 and connect the disconnection container 4, the voltage transformer 5, and the lightning arrester 6 in their positions as shown in Fig. 10. I was driving.

[Problems to be Solved by the Invention] Since the withstand voltage test of the conventional gas insulated switchgear was conducted as described above, prior to the test, (1) the insulating gas in the cable head container 3 and the disconnection part container 4 was tested. (2) remove the disconnection part container 4, voltage transformer 5 and lightning arrester 6, (3) connect the test bushing 12 or test cable pen 13 instead, (
A series of operations were required: 4) evacuating the newly connected part and the inside of the cable head container 3, and 5) filling the evacuated container with insulating gas. Moreover, if the test bushing 12 shown in FIG. 11 is only provided for the - phase due to the configuration of adjacent equipment, the MA-related gas may be collected for each phase-specific withstand voltage test, and the 11 electrical connection may be performed. Replace, vacuum, I! The work of refilling with marginal gas is added. Moreover, a similar series of operations is required to restore the state shown in FIG. 10 after the withstand voltage test, and in the end, a considerable number of days are spent on the withstand voltage test.

On the other hand, in the gas insulated switchgear shown in FIG.

After the cable is led out from the cable head container 3, a bushing is connected to the other end of the cable, and this bushing is connected to an overhead power line. Therefore, a lightning arrester 6 is provided to protect against lightning surges entering from the overhead power transmission line.

However, from the standpoint of environmental harmony or beautification, underground cables and other cables have come to be used instead of the overhead TL lines, and this trend has become particularly noticeable in urban areas. This change eliminates the intrusion of lightning surges into gas-insulated switchgear and eliminates the need for lightning arresters. Therefore, the gas insulated switchgear shown in FIG. 10 does not require the lightning arrester 6, and an open space can be created correspondingly.

An object of the present invention is to provide a gas insulated switchgear that allows a withstand voltage test to be easily performed using the above-mentioned open space.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects a withstand voltage test container to the anti-breaker side of the cable head container, and connects to this withstand voltage test container from the outside. A voltage applying part that can be operated from the outside so that when one phase conductor of the three-phase conductors in the cable head and the voltage applying part are connected alternately, the other two phase conductors are grounded. It is characterized by comprising a connection device.

[Function] Since the gas insulated switchgear of the present invention is constructed as described above,
When conducting a withstand voltage test, connect a voltage source to the voltage application section above,
If you select a phase to perform a withstand voltage test using the connection device, you will need to ground the conductors of the other two phases at the same time. A withstand voltage test can be performed without any work. Moreover, since the withstand voltage test container is provided on the side opposite to the circuit breaker of the cable head container in which the conventional lightning arrester is provided, the open space is utilized without increasing the installation area.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially sectional front view of the gas-insulated switchgear, in which the main busbars IA and IB are connected to one side of the circuit breaker 2, and the cable head container 3 is connected to the other side of the circuit breaker 2. There is. Although detailed illustrations of the circuit breaker 2, etc. have been omitted, as can be seen from the structure inside the cable head container 3, the 6-cable head container 3, which is configured as a three-phase bracket type, has a power line side disconnector DS and a grounding device. The switch ES is configured, and the power transmission line side pole of the disconnector DS provided with the earthing switch ES is
The cable head CH is configured and the cable head container 3
It will be connected to a load (not shown) or the like via a cable led out.

Further, a withstand voltage test container 7 is connected to the side opposite to the breaker of the cable head container 3, and the conductor on the cable head CH side in the cable head container 3 is introduced into the withstand voltage test container 7. . Inside the withstand voltage test container 7, a connection device 30, the details of which will be described later, is configured to be operable from the outside with a handle 31, and an instrument transformer 5 is connected to the withstand voltage test container 7. , a voltage applying section 32 that can be electrically connected from the outside is configured. This voltage application section 32 is constituted by, for example, a slip-on cable head 8, and the electrical connection is completed by inserting the other end of the cable 33 connected to a voltage source (not shown) further than the shown position. Further, the rotating shaft 9 of the connecting device 30 having the handle 31 is led out of the withstand voltage test container 7 by a bearing 34 that maintains airtightness and allows its rotation, and is normally sealed by a container 35 on the atmosphere side. Thus, when the container 35 is removed and the handle 31 is rotated, the connecting device 30 is configured to connect the conductors of any one phase to the voltage source connected via the cable 33 and to ground the other two phases. The details are shown in Figure 2.

FIG. 2 shows an enlarged view of the connection device 30, and shows the three-phase conductors 20A, 20B, and 20C introduced into the withstand voltage test container 7 from the cable head container 3 side, and the conductor of the phase located one front. 20C is omitted from illustration.

The conductor 20B introduced from the cable head container 3 is connected to a connecting conductor 10 raised upward to ensure an insulating distance between it and the connecting device 30.
Potential transformer 5 is connected via. Connection device 3
As can be seen from FIG. 3, which is a cross-sectional view taken along the line ■-■ in FIG. . As shown in FIG. 2, a first conductor 14 and a second conductor 17 are substantially coaxially connected to the rotating shaft 9 via an insulator 16A and further via an insulator 16B.

A conductor 36 is connected to the first conductor 14, and a current collector 37 provided at the upper end of the conductor 36 maintains the electrical connection while allowing the first conductor 14 to rotate.

Further, the conductor 36 is smoothly bent so as to maintain an insulating distance between it and the conductor 20B as shown in FIG.

The second conductor 17 is connected to one end of a grounding conductor 19 which is rotatably formed and electrically connected to the current collector 38, and the other end of the grounding conductor 19 is fixed to the inner surface of the withstand voltage test container 7. and grounded. Further, each phase conductor 20A, 20B, 20 extends in a direction substantially perpendicular to the first conductor 14.
As shown in FIG. 4, application side contacts 15 which can alternately contact G are provided as shown in FIG.

Ground side contacts 18A, 18B, and 18C that can simultaneously contact any two phases 20B and 20C are provided as shown in FIG.

Therefore, in the state shown in FIG. 2, the conductor 20B has 9 voltage sources (not shown)...Slip-on cable head 8...Conductor 36...Collector 37...
-Both cylinder 1 conductor 14... A voltage for a withstand voltage test is applied through the path of the application side contactor 15. In addition, the other two-phase conductors 2OA and 20C, excluding the conductor 20B to which the voltage at this time is applied, are connected to the ground...withstand voltage test container 7...earth conductor 19... ...Collector 38, old...Second conductor 17...Ground side contactor 1
It is grounded through routes 8B and 18C. This situation can be seen in FIGS. 6(a) and 6(a), which respectively show cross-sections of the portions corresponding to the application side contact 15 and the grounding side contacts 18A, 18B, and 18C.
b).

When the rotating shaft 9 of the connecting device 30 is rotated 90 degrees counterclockwise by the handle 31 shown in FIG.

As shown in FIGS. 5(a) and 5(b), the application side contact 15 contacts the conductor 20A, and the ground side contacts 18A, 18B contact the conductors 20B, 20C to ground them.

At this time, the ground side conductor 18C has no contact relationship as shown in the figure. Furthermore, when the handle 31 is rotated 90 degrees clockwise from the states shown in Figs. 2 and 6, Figs. 7(a) and (
As shown in b), the application side contactor 15 contacts the conductor 20C,
In addition, the ground side contacts 18A and 18C are conductors 20A and 20B.
and ground it by contacting it. At this time, the ground side contactor 18
B has no contact relationship as shown.

In this way, the connection device 30 can connect any one phase to the voltage source using the application side contactor 15, and ground the remaining two phases using the grounding side contactor. Therefore, during the withstand voltage test of any one phase, the other two phases will not be forgotten to ground.

Also, the application side contactor 15 and each phase conductor 2OA, 20B.

If we look at a 2oC contact, the current drawn by this contact is very small, so 20A on each phase conductor.

A simple contact may be provided in the hollow portions 20B and 20C, and this contact may be brought into contact with the application side contact 15.

Connection device 1 in the same state after completion of the withstand voltage test
li30 becomes an obstacle to the operation of gas insulated switchgear. After the withstanding voltage test is completed, the first
Now rotate the handle 31 shown in the figure by 45 degrees. Then, the application side contactor 15 connects each phase conductor 2O as shown in FIG. 8(b).
A, 20B, and 20C are electrically insulated, and the ground side contacts 18A, 18B, and 18C are also electrically insulated from each phase conductor 20A, 20B, and 20C as shown in FIG. 8(a). The state will be as follows.

As can be seen from these explanations, the withstand voltage test container 7 having the connection device 30 and the voltage application part 32 is always connected to the gas insulated switchgear, and when the installation is completed or the expansion is completed, A withstand voltage test is performed by operating the handle 31 and connecting with the slip-on cable head 8 from the outside, and the withstand voltage test container 7 is maintained even after the test is completed.
The gas insulated switchgear can be operated with the switch connected. There is a concern that the installation area of the gas insulated switchgear will increase due to the permanent installation of the withstand voltage test container 7, etc., but as can be seen from the comparison of FIGS. 9 and 10, the installation area will not increase. In other words, since the withstand voltage test container 7 is connected to the anti-breaker side of the cable head container 3, the 10th
A withstand voltage test container 7 can be attached in a space corresponding to the conventional lightning arrester 6 shown in the figure.

In the above embodiment, the instrument transformer 5 is connected above the withstand voltage test container 7, and the voltage applying part 32 is configured below, but the positional relationship and the shape of the withstand voltage test container 7 can be changed arbitrarily. can be selected. In addition, in the operating state of the gas-insulated switchgear, the voltage applying section 32 is connected to the conductors 20A, 20B, and 20C of each phase on the side of the cable head container 3, which is insulated by an insulating gas, as shown in FIG. 8(b). Since there is a holding part, there are no electrical problems, but it can be sealed with a suitable lid.

[Effects of the Invention] As explained above, the present invention connects a withstand voltage test container to the anti-breaker side of the cable head container, configures this container with a voltage applying section connectable to a voltage source, and Since a connection device that can be operated from the voltage application section is configured in this container, a voltage source can be connected to the voltage application section, and the conductor of any one phase can be connected to the voltage application section by operating the connection device, and the other two phases can be connected to the voltage application section. It can be grounded, and the withstand voltage test can be easily performed by omitting the collection and filling of insulating gas and the associated work as in the conventional method. Moreover, since the connection position of the withstand voltage test container is selected, there is no need to increase the installation area of the gas insulated switchgear.

[Brief Description of the Drawings] Fig. 1 is a partially sectional front view of a gas insulated switchgear according to an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a 4 is an enlarged perspective view of the connecting device shown in FIG. 1, and FIGS. 9 is a front view showing the external appearance of FIG. 1, and FIG. 10 is a front view of a conventional gas-insulated switchgear.
1 and 12 are front views of a gas insulated switchgear showing different conventional withstanding voltage test conditions. 2... Circuit breaker, 3... Cable head container, 5... Instrument transformer, 7... Container for withstanding voltage test, 8... ... Slip-on cable head, 15 ... Application side contact, 18A, 18
B, 18C...Ground side contact, 20A, 20B
, 20C... Conductor, 30... Connection device, 31... Handle, 32... Voltage application section. Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 (C) (b) Figure 8 Figure 9 Figure 10 Figure 11 Figure 12゜Figure 12

Claims (1)

[Scope of Claims] 1. In a gas-insulated switchgear comprising a cable head container housing at least three-phase conductors inside on one side of a circuit breaker connected to the main bus, A withstand voltage test container is connected to the circuit breaker side, and to this withstand voltage test container, there is a voltage application part for one phase withstand voltage test that can be connected from the outside, and the three-phase conductor in the cable head. A gas-insulated gas insulation device comprising a connecting device that can be operated from the outside to ground the conductors of the other two phases when the conductor of one of the phases and the voltage application section are alternately connected. Switchgear. 2. In the device according to claim 1, the connecting device is substantially concentrically connected to a rotating shaft that is rotated by a handle provided outside the withstanding voltage test container via an insulator. a first conductor having application side contacts projecting in the radial direction so as to alternately contact one phase conductor of the three phase conductors; and approximately concentrically connected to the first conductor via an insulator. A second ground contactor having a ground side contact protruding in the radial direction so as to be in contact with the other two phase conductors of the three phase conductors.
A gas insulated switchgear characterized by comprising a conductor.