JPH02294206A - Compressed-gas-insulated switchgear - Google Patents

Abstract

PURPOSE:To make compact a common container having a voltage application section by constituting an operation section of a connection device and a disconnection section on the same side of the common container along main circuit conductors. CONSTITUTION:In a common container 5 where three-phase main circuit conductors 8a to 8c are enclosed, an instrument transformer 7 and a voltage application section 40 connected with main circuit conductors 8a to 8c are provided. The voltage application section 40 is alternately connected to an arbitrary phase of the three-phase main circuit conductors 8a to 8c in the common container 5, while a connection device 17 to earth the other two-phase main circuit conductors. A disconnectable disconnection section 44 is constituted between the instrument transformer 7 and the main circuit conductors 8a to 8c. An operational mechanism section 6 of this disconnection section 44 and that of the connection device 17 are constituted on the same side of the common container 5. The common container 5 can thereby be made compact.

Description

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

[Conventional technology] Generally, gas-insulated switchgear is constructed by housing the main circuit conductor in a sealed container filled with insulating gas, so after installation, a withstand voltage test is performed in which a predetermined voltage is applied to the main circuit conductor. It is configured to have a voltage application section for.

The conventional gas insulated switchgear is disclosed in Japanese Patent Application No. 61-29390.
As shown in No. 0 and Japanese Patent Application No. 63-117007, three-phase main circuit conductors are arranged in a common container, and when the voltage from the voltage applying part is applied to any one phase, other It was elliptical with a connecting device to ground the two rivers.

[Problems to be Solved by the Invention] However, in the conventional gas-insulated switchgear described above, when a voltage transformer is connected to a common container provided with a voltage application section, it is generally necessary to disconnect the voltage transformer from the main circuit conductor. Although it is desirable to construct a disconnecting section that can be separated, conventional gas insulated switchgears have not taken any consideration in this regard.

Therefore, if the above-mentioned disconnection section is simply added, the common container must be configured with an operation section for the connection device and an operation section for this disconnection section, making the structure of the section complicated and large. I end up. Moreover, some kind of interlock is required between the connecting device and the disconnecting section in order to ensure that the disconnecting section is opened prior to the voltage application test.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas-insulated switchgear in which a common container having a voltage applying section can be configured compactly.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects four arbitrary one-phase main circuits to the voltage application part in a common container having a voltage application part, and connects other main circuits to the voltage application part. A connecting device for grounding the two-phase main circuit conductor and a disconnecting section for disconnecting the voltage transformer from the main circuit conductor, and an operating section for the connecting device and the disconnecting section,
It is characterized in that it is configured on the same side of the common container along the main circuit conductor.

[Function] Since the gas insulated switchgear according to the present invention has the above-described configuration, by configuring both operating sections on the same side of the common container, it is possible to arrange the drive system almost parallel to the main circuit conductor. Therefore, electric disconnection becomes easy and the structure becomes simple, allowing the common container to be made compact.

Furthermore, since both operating sections are located on the same side, operation and interlocking are facilitated, and the disconnecting section of the potential transformer can be opened and closed only when a voltage application test is not being performed.

Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a skeleton of a gas insulated switchgear to which the present invention is applied. The double main buses BUSI and BUS2 each have a bus disconnector DSL. It is connected to one end of circuit breaker CB via DS2. Earthing switches ESI and ES2 are connected to both ends of the circuit breaker CB, respectively. The opposite side of the circuit breaker CB to the main bus bar is connected to the cable pen CH1 via a line-side disconnector DS3. Between the line-side disconnector DS3 and the cable head CHI, there is an earthing switch ES3, a potential transformer PT via a disconnector DS4, and a connection DS5.
and a voltage applying section consisting of a cable head CH2.

FIG. 7 shows a cross-sectional front view of the main parts of a gas-insulated switchgear constructed based on this skeleton.

Main busbars BUSI, BUS2 and busbar side disconnector DSL,
DS2 is constructed in containers 1 and 2, which are arranged vertically on one side of a container 3 that includes a circuit breaker CB and earthing switches ES1 and ES2.

In a container 4 connected to the opposite side of the circuit breaker container 3, a track side disconnector DS3, an earthing switch ES3, and a cable head CHI are configured, and in a common container 5 which is the main part connected to the container 4, , potential transformer PT via disconnection section DS4
7 is connected to the cable head CH2 via a connecting portion DS5.

The configuration centered around this common container 5 will be explained in more detail with reference to FIG. 1, which is an enlarged view.

In this example, the main body of the common container 5 extends substantially horizontally, the voltage transformer PT7 is connected to the upper part thereof, and the voltage applying part is constituted to the lower part thereof. The voltage application section is
It has a slip-on cable pen CH2 for connecting a cable connected to a power source (not shown), and is sealed by a cover 40 as shown in the drawing in a normal state. However, during the voltage application test, the cover 40 can be removed to connect the cable.

In the main body of the common container 5, there are main circuit conductors 8a, 8b, and 8c located at each vertex of an approximately equilateral triangle, and a contactor 19 is located at the center of the equilateral triangle of the main circuit conductors 8a, 8b, and 8c. ing. This contact 19 is held at the upper end of the conductor 16 supported by the insulator 13a, and the lower end of the conductor 16 is connected to the slip-on cable pen CH via the contact 2o.
Connected to 2. The movable conductor 10, which is in electrical contact with the contact 19, is connected to the operating rod 14 via the insulator 13b, and rotates in conjunction with the rotation of the operating rod 14, and moves the contact 1
9 is configured to maintain electrical contact with. At the left end of the movable conductor 10, there is a first contact 11 that protrudes perpendicularly to the rotation axis, and this first contact 11 can alternately contact each of the main circuit conductors 8a, 8b, and 8c. It is.

Also, a ground contact 12 is placed in a position where it can be contacted with the first contact 11.
is provided, and this ground contact 12 is grounded via the common container 5. The operating rod 14 connected to the movable conductor 10 also has a pair of second contacts 14a, L4b protruding perpendicularly to the rotation axis thereof.
a, 14b can contact two phases of the main circuit conductors 8a, 8b, 8c. First contact 11 and second contact 14a
, 14b are different from each other, and the first contact 11
is in contact with any main circuit conductor, the second contacts 14a, 14b are in contact with other non-contact two-phase main circuit conductors,
Further, when the first contact 11 is in contact with the ground contact 12, the second contact 14a, 14b is connected to either main circuit conductor 8a.
, 8b, and 8c, their respective protruding directions are determined so that they do not come into contact with each other. In this way, the movable conductor 10
A connecting device 17 is mainly composed of. Therefore,
According to this connection device 17, when a power supply (not shown) and an arbitrary one-phase main circuit conductor are electrically connected via the slip-on cable head CH2 and the first contactor 11, the other two-phase main circuit conductors are This means that it is grounded via the second contacts 14a, 14b and the operating shaft 14. The right end in the axial direction of each main circuit conductor 8a, 8b, 8c arranged at each vertex of the equilateral triangle is connected to a flange 2 that airtightly seals the same end of the common container 5.
It is supported via an insulator 13c attached to 1.

Next, the connection between the main circuit conductor 8a and the potential transformer 7 will be explained.

A contactor 42 is attached to the branch conductor 41 of the main circuit 4 body 8a, and a contactor 4 provided at a position opposite to this contactor 42
3 is. It is attached to a conductor 9 connected to an instrument transformer 7. The movable element 18, which bridges between both contacts 42 and 43, is connected to the operating rod 15 via an insulator 13d.
By moving to the right, a disconnection section 44 is formed which disconnects the voltage transformer 7 from the main circuit conductor 8a.

This disconnection section 44 needs to be opened prior to operation of the connection device 17 in order to protect it from DC voltage during a voltage application test. For this reason, it is necessary to establish an interlock between the operating mechanism for the connecting device that operates the operating tip 14 of the connecting device 17 and the operating mechanism for the disconnecting section that moves the operating tip 15 of the disconnecting section 44. will be explained using FIGS. 8 to 10 showing details of the operating mechanism 6 in FIG. 1.

The operating shaft 14 of the connecting device 17 is rotatably maintained in an airtight manner with respect to the flange 21, and a handle 26 for applying rotational force is connected to a connecting portion 14c at the right end thereof. The operating rod 15 of the disconnecting portion 44 is slidable in the axial direction while maintaining airtightness with respect to the flange 21, and a connecting portion 15a with a handle that applies rotational force is formed at the right end thereof. A male threaded portion 15b is formed at the right end of the operating bar 15, and a female threaded portion 46 screwed therewith is supported and fixed to the flange 21. Therefore, the handle 2 indicated by the two-dot chain line is attached to the connecting portion 15a.
5 is engaged and rotated, the operating rod 15 is moved to the right by the driving force of the screw and opens the disconnection section 44 shown in FIG. At the lower end of the metal fitting 22 fixed to this operation support 15,
An engagement notch 22a is formed therein, and an L-shaped blocking portion is arranged approximately parallel to the operating bar 15 and protrudes to the right within a range that does not affect the closing operation of the door 29 of the operating mechanism box 45. A metal fitting 24 is connected. In operation 14, the tip was thrust to the right. A locking fitting 23 having an engaging projection 23a is fixed, and when the movable conductor 10 is in contact with the ground contact 12 as shown in FIG. 1, the engaging projection 23a is fixed as shown in FIG. protrudes into the engagement cutout portion 22a of the metal fitting 22 and engages therewith. That is, the door closing prevention means 49 is configured mainly around the prevention fitting 24.
The voltage application blocking means 4 is configured by the engagement notch 22a of the metal fitting 22 and the engagement protrusion 23a of the locking metal fitting 23.
8. Therefore, when the disconnecting section 44 is opened as described above, the blocking fitting 24 of the door closing blocking means 49 protrudes to the position indicated by the two-dot chain line in the figure to prevent the door 29 from closing.
The gas AM switchgear is never operated with the disconnection section 44 left open. In other words, the door 29 cannot be closed unless the handle 25 is operated to close the disconnection section 44 and the blocking fitting 24 is moved back to the position shown by the solid line. Further, when the metal fitting 22 moves to the right with the opening of the disconnecting portion 44 and reaches the position indicated by the two-dot chain line on the right side from the tip of the engagement protrusion 23a, the engagement protrusion 23a moves to the engagement notch 22a.
Since the engagement is released, the operating rod 14 becomes rotatable, and the handle 26 can be operated to apply voltage to any phase. In other words, the voltage application test cannot be performed unless the disconnecting section 44 is opened.

Further, a disc 27 is attached to the operating rod 14, and a recess 27a is formed in a part of the outer periphery of the disc 27. There is a roller 3o that rotates along the outer circumferential surface of this disc 27, and this roller 30 is movable in the vertical direction by a pressure spring or the like (not shown) in a support case 53 attached to a flat plate 5o supported and fixed to the flange 21. It is attached to an engagement prevention fitting 31 supported by the holder. This engagement prevention metal fitting 3
1 is located between the connecting part 15a and the door 29 in FIG.
It has an opening 31a at a location corresponding to the connecting portion 15a.

To explain in more detail, this hole 31a allows the reroller 30 to engage with the recess 27a when the movable conductor 10 is in contact with the ground contact 12 as shown in FIGS. 1 and 9. When the state detection means 52 detects
Allowing the handle 25 to be inserted and engaged with the coupling portion 15a. However, when the movable conductor 1o is separated from the ground contact 12 and is in contact with any main circuit conductor, that is, when the roller 30 is in contact with the outer periphery of the disc 27 other than the recess 27a, the state detection means 52 is not detected. At the time of detection, the aperture 31a of the engagement prevention means 51 moves upward compared to the state shown in FIG.
Even if the handle 25 is inserted through the hole 31a, the connecting portion 1
It does not engage with 5a.

Therefore, the only condition under which the handle 25 can operate the disconnecting section 44 is when the movable conductor 10 is in contact with the ground contact 12, and this condition is obtained by the engagement prevention means 51 having the above-described structure. Opening 31 of engagement prevention fitting 31
If a hole of the same size as the hole 31a is formed in the flat plate 50 opposite to the hole 31a, the roller 30 will be located on the outer periphery of the disk 27 other than the concave portion, and the engagement prevention fitting 31 will be in the position shown in FIG. When the handle 25 is moved upward, the position of the aperture 31a in the flat plate 50 is shifted, and therefore the handle 25 cannot pass through the aperture 31a. On the other hand, if a hole is formed in the flat plate 50 to a size that maintains communication with the opening 31a even if the engagement prevention metal fitting 31 moves up and down, the engagement prevention metal fitting 31 will change as shown in FIG. When the handle 25 is moved above the position of
It does not engage with 5a. In this way, the engagement prevention means 51 can take various configurations, but in any case, the disconnection section 44 can be connected in a state in which the connection device 17 is grounded, in other words, in a state in which a voltage application test is not performed. Any configuration that allows operation is fine.

The handle 26 engaged with the connecting portion 14c of the operating rod 14 is formed with a small hole 26a along with a knob 47 thereof.

Also, small holes 32a, 32b, 32c are formed on the flat plate 5o, which is on the movement trajectory of the small hole 26a when the handle 26 is rotated.
are formed, and these small holes 32a, 32b, 32c correspond to the state in which the movable body 10 is in contact with the main circuit conductors 8a, 8b, 8c, and a chain (not shown) that passes through both small holes 26a and 32a, 32b, 32c. The locking rod constitutes a locking device that maintains the same state. This locking device consists of a flat plate 50 and a disc 2.
It is also possible to form a small hole in each of 7 and 7.

Although not shown in detail, the handle 28 of the door 29 of the operation mechanism box 45 is provided with an electrical interlock means, which opens the disconnector DS3 in FIG. 6 and closes the earthing switch. Only when ES3 is closed and potential transformer PT7 is without voltage, the above-mentioned interlock means is released and door 2 is closed.
9 can be opened.

In the steady state shown in FIG. 1, the first contact 11 is in contact with the ground contact 12 as shown in FIG. 25 can be inserted and the disconnection section 44 can be operated. At this time, the second contacts 14a and 14b are
), it is not in contact with any of the main circuit conductors 8a, 8b, and 8c.

Only in this state can the disconnecting section 44 be opened.

When the disconnection section 44 is opened, the engagement notch 22a and the engagement protrusion 23a are disengaged, the voltage application blocking state is released, and the operating rod 14 becomes rotatable and ready for voltage application. Thereafter, when the handle 26 in FIG. 9 is operated to bring the first contact 11 into contact with any main circuit conductor for a voltage application test, the engagement prevention means 51 is activated and the disconnection section 44 is prevented from operating. It becomes possible.

When the first contact 11 is brought into contact with the main circuit conductor 8b as shown in FIG. 3(a), the second contacts 14a and 14b are brought into contact with the main circuit conductor 8b as shown in FIG.
The main circuit conductors 8a and 8c are contacted and grounded as shown in FIG. Furthermore, when the first contactor 11 is brought into contact with the main circuit conductor 8a as shown in FIG. Ground this. Furthermore, when the first contactor 11 is brought into contact with the main circuit conductor 8c as shown in FIG. 5(a), the second contacts 14a, 14b
contacts the main circuit conductors 8b and 8c to ground them, as shown in FIG. 2(b). In this way, a voltage application test can be performed by connecting a power source to the slip-on cable head CH2.

After the voltage application test, when the connecting device 17 is returned to the state shown in FIG. 1, the engagement preventing means 51 shown in FIG. . When the disconnection section 44 is in the closed state, the engagement notch 22a and the engagement protrusion 23a are engaged as shown in FIG. 10, so it is not possible to rotate the operating bar 14 to perform a voltage application test. Also, if you forget this closing operation and close door 2,
9, the user is unable to do so because the door-closing prevention metal fitting 24 of the door-closing prevention means 49 protrudes, and realizes that he has forgotten to return the disconnection section 44. Therefore, the potential transformer PT
A voltage application test is not performed with PT7 connected, and operation is not started with potential transformer PT7 disconnected. Furthermore, since the connecting device 17 is also grounded, a gas insulated switchgear which is excellent in terms of electrical performance without creating an electrical float part can be obtained. The interlock between the operation of the disconnection section 44 and the operation of the connection device 17 described above is achieved by using the operation rods 14 and 15 of both.
Since the operating mechanism 6 is constructed by leading out to the same side of the common container 5, it can be constructed with a simple mechanism as described above. Moreover, with this configuration, the common container 5 can be formed simpler and more compact than when the disconnection section 44 and the operating mechanism section of the grounding device 17 are respectively configured at dedicated positions.

[Effects of the Invention] As explained above, the present invention includes a connection device that connects the main circuit conductor of any phase and the voltage application section, and a disconnection section that connects the voltage transformer and the main circuit conductor. However, since these operating mechanisms are operated by operating mechanisms configured on the same side of the common container, the common container can be made more compact, and the mechanical interlock between both operating mechanisms can be easily established. You can take it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a gas-insulated switchgear according to an embodiment of the present invention, and FIGS. 2(a), (b) to 5(a), (
b) is a sectional view showing different operating states along lines I-1 and ■-■ in Figure 1, Figure 6 is a skeleton diagram of a gas-insulated switchgear, and Figure 7 is a book based on Figure 6. A partially sectional front view of a gas insulated switchgear according to an embodiment of the invention, FIG. 8 is a vertical sectional view showing the operating mechanism of FIG. 1, and FIG.
FIG. 10 is an enlarged side view of the main part showing the voltage application blocking means. 5... Common container, 6... Operating mechanism, 7
...Instrument transformer, 8a, 8b, 8c...
Main circuit conductor, 11... First contact, 12...
...Ground contact, 14a, 14b, 14c...Second contact, 14.15...Operation dedicated, 17...
Connection device, 40... Voltage application section, 44...
... Disconnection section, 48 ... Voltage application blocking means, 49.
...Door closing prevention means, 51...Engagement prevention means,
52...State detection means. Figure (b) Figure 3 l4 (a) (b) Figure number 5: Military structure χκ 6: Testing mechanism. 7: Total g usage 8 8a, 8b, 8c: LrBX! r44l7: Dedicated M1 40: Kameoka ep Kashu 44J Jyakushu Figure 4 (b) Figure 5 (a) (b) 6th factor Figure 7 Figure 9 Figure 8 Figure 10

Claims (1)

[Claims] 1. An instrument transformer connected to the main circuit conductor and a voltage application section are provided in a common container housing three-phase main circuit conductors, and the voltage application section is provided in the common container. In the gas-insulated switchgear, the gas-insulated switchgear comprises a connecting device that alternately connects the three-phase main circuit conductor to any one phase of the three-phase main circuit conductor and grounds the other two-phase main circuit conductor, A gas-insulated switchgear, characterized in that a disconnecting section that can connect and disconnect between the main circuit conductors is configured, and an operating mechanism section of the disconnecting section and an operating mechanism section of the connecting device are configured on the same side of the common container. Device. 2. The device according to claim 1, wherein both the operating mechanism parts are configured in an operating mechanism box having an openable/closable door,
A gas insulated switchgear characterized in that a door closing prevention means is provided for preventing the door from closing when the disconnection section is in an open state. 3. The device according to claim 1, further comprising a state detecting means for detecting a state of the connecting device in which the voltage applying section and the main circuit conductor are not connected, and a state detecting means for detecting a state of the connecting device in which the voltage applying section and the main circuit conductor are not connected, and the operating mechanism only in the detected state of the state detecting means. A gas insulated switchgear characterized in that it is provided with an engagement prevention means for allowing the operation of the disconnection section by the section. 4. The gas insulated switchgear according to claim 1, further comprising a grounding contact for grounding the connecting device when the voltage applying section and the main circuit conductor are not connected.