JPS6340836Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tank-type disconnector, and particularly relates to a disconnector of the type that has an open circuit part that can withstand operating voltage and an open circuit part that can withstand the test voltage of an extension part connected in series.

In recent years, there have been many plans to increase the number of switching equipment in closed switchyards. When adding switchgear equipment, it is necessary to conduct a withstand voltage test on the added part, and during the test, it is necessary to perform some kind of insulation classification at the connection between the existing part that is in operation and the added part.

This type of insulation section requires that there be an open circuit part that can withstand the operating voltage and an open circuit part that can withstand the test voltage of the extension part in series, and also that the intermediate point be grounded to prevent dielectric breakdown. It is necessary to keep it. Conventionally, this has been dealt with by installing two disconnectors in series in advance when installing an existing part, or by separately providing a bus bar for separating the disconnector and the conductor. These methods also install a grounding device at an intermediate point.

FIG. 1 shows an example of a tank type disconnector that combines a conventional disconnector and a conductor separation bus bar. In the figure, a grounded disconnector tank 1 has a first current-carrying conductor 3 connected to a fixed contact 2 of the disconnector, and a second current-carrying conductor 4 electrically connected to a movable contact 6 by a contactor 5. It is equipped with The movable contact 6 is connected to a link mechanism 8 by an insulated operating rod 7, and the first current-carrying conductor 3 and the second current-carrying conductor 4 are connected to and separated from each other by the engagement of the movable contact 6 with the fixed contact 2 by the link mechanism 8. It is done by meeting and leaving. The second current-carrying conductor 4 is the detachment conductor 1 in the detachment bus tank 9.
0, and is further connected to the extension bus conductor 12 in the extension bus tank 11. First current-carrying conductor 3, second current-carrying conductor 4, separation conductor 10, extension bus conductor 1
2 is connected within the disconnector tank 1 to an electrode 14 supported by an insulating spacer 13 or via a contact 15 to the electrode 14 .
Reference numeral 16 indicates a working manhole for attaching and detaching the breakaway conductor 10, and 17 indicates SF ₆ gas as an insulating medium sealed in the disconnector tank 1, the breakaway bus tank 9, and the extension bus tank 11. The contactor 5 is also provided with a fixed contact 18 for grounding, which is engaged with a movable contact 19 driven by a grounding device linkage 20 to connect the second current-carrying conductor 4.
Ground.

In FIG. 1, when the first current-carrying conductor 3 is in the operating state, in order to carry out the withstand voltage test after the extension bus conductor 12, the link mechanism 8 of the disconnector is used to connect the first current-carrying conductor 3 to the second current-carrying conductor 3. After opening the circuit with the conductor 4, the second current-carrying conductor 4 must be grounded by the grounding device link mechanism 20, the manhole 16 must be opened, and the disconnection conductor 10 must be disconnected. In this case, before opening the manhole 16, the enclosed SF ₆
It is necessary to recover the gas 17 and refill the detached conductor 10 after detachment so that it can withstand the test voltage. Further, when attaching the detachable conductor 10 after the test is completed, the same operations must be performed in the reverse order.

As described above, the conventional method using a disconnect switch and breakaway bus bar requires a breakaway bus bar in addition to the disconnect switch to carry out a withstand voltage test on an expansion section separated from the existing section in operation, which is extremely difficult. It was uneconomical. In addition, it takes time to attach and detach the breakaway conductor, as well as time to recover and fill the SF ₆ gas.Furthermore, since the attachment and detachment work involves opening a manhole, there is a possibility that dust and metal powder may enter from outside, which may cause problems in terms of insulation performance or management. It's not a very pleasant task. Note that the method of installing another disconnect switch in place of the breakaway bus bar had the disadvantage of being even more uneconomical.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology, and the object is to provide a tank-type disconnector that can easily connect and disconnect the operating section and the extension section during a pressure test of the extension section. The conventional disconnector is equipped with a first contact that can connect and disconnect, and a disconnector that has a second contact that can selectively connect and disconnect the test section and the grounded sealed container. without installing new supports or increasing the length of the
The feature is that it is possible to conduct a withstand voltage test of an expanded section using a single disconnector.

Examples illustrating this invention will be described below. The disconnector of this invention, as shown in Fig. 2, features the structure described below, and is otherwise almost the same as the conventional one shown in Fig. 1, so equivalent parts are given the same reference numerals and explained below. is omitted. As shown in FIG. 2, the disconnector of this invention is equipped with a movable contact 21 that can be brought into and out of contact with a fixed contact 2 connected to a first current-carrying conductor 3, and the movable contact 21 is in contact with a contactor 22 and It is movably mounted and includes a protrusion 21a that engages with the recess 22a of the contact 22 at the end of movement, and the recess 22a and the protrusion 21
a is engaged with the movable contact 21 so that the contact 22 rotates with the movable contact 21. The contactor 22 has a second current-carrying conductor 23 fixedly extending laterally, and the outer end of the second current-carrying conductor 23 is connected to the electrode 1 provided on the spacer 13.
It can be moved into and out of contact with the fixed contact 24 fixed at 4. As shown in FIGS. 3 and 4, the fixed contact 24 is laterally engaged by the second current-carrying conductor 23, has a contact pressure sufficient to support the contact 22 and the second current-carrying conductor 23, and has a contact pressure sufficient to support the contact 22 and the second current-carrying conductor 23. 2 current-carrying conductor 23
is brought into contact with and separated from the fixed contact 24 from the lateral direction by rotation around the contact 22.

The movable contact 21 is connected to a connecting rod 25 via an insulated operating rod 7, and the connecting rod 25 is connected to an interlocking device 26, as shown in FIG. are provided as shown in FIGS. 7 and 8. The connecting rod 25 is connected to a link mechanism 8, as shown in FIG. A rotational movement of the movable contact 21 is provided.
In FIG. 2, 27 is a guide device for the insulated operating rod 7;
Reference numeral 8 indicates a gas-tight seal, and reference numeral 29 indicates an operating mechanism box that houses the rotating device 26 and the link mechanism 8. Further, as shown in FIGS. 4 to 6, a grounding contact 30 is provided on the grounded disconnector tank 1, and the second current-carrying conductor 23 can be connected to and separated from this contact 30.

To explain the operation, as shown in FIG. 2, the movable contact 21 is moved downward in the figure and separated from the fixed contact 2 by the operation of the link mechanism 8. FIG. 2 shows a state in which the downward movement of the movable contact 21 has reached the end point, the interlock is released, the convex portion 21a and the concave portion 22a are engaged, and the connecting rod 25 is moved as shown in FIGS. 7 and 8. The square column portion 25a is fitted into a square hole 26a of the rotating device 26. Here, connect the connecting rod 25 in the operating mechanism box 29.
The connecting rod 25 is disconnected from the link mechanism 8 and the rotating device 26 is driven to rotate the connecting rod 25 through 90 degrees about its axis. Due to the engagement between the convex portion 21a and the concave portion 22a, the contact 22 is rotated by 90 degrees together with the movable contact 21 connected to the connecting rod 25.
a second current-carrying conductor 23 fixed to the contactor 22;
It is rotated 90 degrees from the state in which it is engaged with the fixed contact 24 shown in FIG. 4, and is engaged with the grounding contact 30 provided on the disconnector tank 1, as shown in FIG. FIG. 6 shows in detail the engagement state between the grounding contact 30 and the second current-carrying conductor 23. In this way, the operating voltage is isolated between the first current-carrying conductor and the grounded second current-carrying conductor 23, and the withstand voltage test voltage is isolated between the extension part bus conductor 12 and the grounded second current-carrying conductor 23. is insulated.

As described above, the extension section and the operating section can be separated from each other using the disconnector of this invention alone, and the withstand voltage test of the extension section can be performed. Therefore, a breakaway busbar or a second disconnector is not required, making it very economical. In addition, there is no need to worry about the work time required for attaching and detaching the detachable conductor, and the concern about deterioration of insulation performance or management due to the incorporation of dust or metal powder. Furthermore, it is possible to obtain the effect that a grounding device is also unnecessary.

Furthermore, if a tank-type disconnector according to this invention is installed in advance when a switchyard or the like is newly constructed, the same effect can be obtained when testing a partially remodeled section of a switchyard or the like, or when testing an accident recovery section.

It should be noted that, as a modification of the above embodiment, the effect can be further improved in the following case.

(1) The rotating device 26 may be powered remotely, for example by a rack and pinion.

(2) Set the connecting position of the movable contact 21 and the contactor 22, and the connecting rod 25 and the rotating device 26 to the first position.
By providing a contact point also at the time of joining and taking an interlock, the first current-carrying part becomes a disconnector that can be grounded.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a conventional tank-type disconnector equipped with a connecting/separating conductor, Fig. 2 is a cross-sectional view similar to Fig. 1 showing an embodiment of the tank-type disconnector of this invention, and Fig. 3 is an enlarged sectional view taken along the line - in FIG. 2, and FIG. 4 is a sectional view taken along the line - shown in FIG.
Fig. 5 is a sectional view similar to Fig. 4, showing the case where the second current-carrying conductor is connected to a grounded sealed container, Fig. 6 is an enlarged sectional view taken along the line - in Fig. 5, and Fig. 7 is a sectional view similar to Fig. 4. FIG. 8 is a cross-sectional view of the rotating device taken along the line - in FIG. 7; 1... Disconnector tank, 2... Fixed contact,
3...first current-carrying conductor, 4...second current-carrying conductor, 5...
...Contact element, 6...Movable contact, 7...Insulated operation rod, 8...Link mechanism, 9...Detachable bus tank, 10...Detachable conductor, 11...Extension bus tank, 12...Extension bus bar Conductor, 13... Insulating spacer, 14... Electrode, 15... Contact, 16...
...manhole, 17...SF ₆ gas, 18...fixed contact, 19...movable contact, 20...
Earthing device link mechanism, 21...movable contact,
22...Contactor, 23...Second current-carrying conductor, 24...
...Fixed contact, 25...Connection rod, 26...
...Twisting mechanism, 27...Guide, 28...Gas-tight seal, 29...Operation mechanism box, 30...Grounding contact.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A grounded sealed disconnector tank containing an insulating medium, and a first
a movable contact that operates to be able to come into contact with and separate from a current-carrying conductor; a contact that slidably contacts the movable contact and is rotatable together with the movable contact;
A tank-type disconnector comprising: a second current-carrying conductor which is fixed to the contact and can selectively connect to and separate from the extension bus conductor and the grounded hermetic disconnector tank. (2) A tank-type disconnector according to claim 1, in which the movable contact and the second current-carrying conductor can be operated by a single operating rod.