JPH0785373B2 - Grounding device for switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a grounding device for a switch.

(Prior art) Generally, in a high-voltage power receiving equipment that uses this type of switch as a main circuit breaker, when performing maintenance and inspection of various circuits and cables below the main circuit breaker, the load-side bus bar should be considered in consideration of safety. However, the grounding equipment was attached to each phase for the work.

(Problems to be Solved by the Invention) However, the above-mentioned work is troublesome, and besides, there is a risk of forgetting to ground, and even if the movable electrode on the load side is turned on, it is grounded and a serious accident occurs. There is also a risk of inviting.

The present invention has been made to solve the above problems, and an object of the invention is to provide a safe switch which does not accidentally ground the load side movable electrode when the load side movable electrode is turned on. To provide a grounding device.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention relates to a pair of fixed electrodes arranged in a switch case, which is always electrically connected to the one fixed electrode. In addition, in a switch provided with a movable body having a movable electrode that is opened and closed with respect to the other fixed electrode, the fixed electrode side switch case inner surface on the movable body side is close to the fixed electrode on the movable body side. And a fixed electrode for grounding, and a movable electrode for grounding which is opposite to the closing direction of the other fixed electrode of the movable body so as to be capable of being grounded, and the movable body is operated for opening and closing. The operation mechanism allows only the opening / closing operation from the opening position to the other fixed electrode or the grounding / opening operation from the opening position to the grounding movable electrode provided on the movable body and allows the other operation. To Locking means is provided, and further, the locking means is provided with a switching means for switching to either one of the clock states, and the operating position locking means is provided on the operation input side of the operating mechanism to display the status to the operator. In (1), only the opening / closing operation from the opening position to the other fixed electrode or the grounding / opening operation from the opening position to the grounding movable electrode provided on the movable body is allowed and only the other operation is locked. The first lock member and the opening / closing operation from the opening position to the other fixed electrode on the output side of the operating mechanism, or the grounding / opening operation from the opening position to the grounding movable electrode provided on the movable body. The gist of the present invention is to include a second lock member that allows only one movement and locks another movement.

(Operation) With the above configuration, the fixed electrode 11 arranged in the switch case is provided.
On the other hand, the movable body that performs the opening and closing operation is provided with a grounding movable electrode that faces in a direction opposite to the closing direction with respect to the fixed electrode 11.
The grounding movable electrode is provided so that it can be grounded to the grounding fixed electrode provided on the side opposite to the fixed electrode 11 (on the side of the fixed electrode 10 on the movable body side).

Further, the movable body is made into an opening / closing operation from the open position to the other fixed electrode 11 by the locking means provided in the operating mechanism for making the opening / closing operation of the movable electrode, or the grounding of the grounding movable electrode provided in the movable body from the open position. Only one of the operations of opening and closing the ground to the fixed electrode for use is permitted, and the other operations are disabled and locked. At this time, on the operation input side of the operating mechanism, the first clock member makes an opening / closing operation from the open position to the other fixed electrode or a ground provided on the movable body from the open position on the operation input side of the operation mechanism. Allows only one of the grounding and opening operations to the movable electrode for use and locks the other operations. Further, the second clock member performs, on the output side of the operating mechanism, a closing / opening operation from the opening position to the other fixed electrode or a grounding / opening operation from the opening position to a grounding movable electrode provided on the movable body. Allow only one action and lock the other. Further, the lock means is switched to either one of the clock states by the switching means.

(Embodiment) An embodiment in which the present invention is embodied in a gas multi-circuit switch will be described below with reference to FIGS. 1 to 6.

In the drawing, reference numeral 1 denotes a switch case in which an arc extinguishing gas is enclosed and is grounded. A bushing 2 for one circuit and three phases whose outer end is grounded to a load-side cable (not shown) is provided at the bottom of the case 1. Reference numeral 2A denotes a plurality of bushings (only one circuit is shown in the drawing) arranged in parallel with the bushing 2 at a predetermined distance, and each of the bushings 2 constitutes a different circuit.

Reference numeral 3 denotes a bellows provided on the inner end of each of the bushings 2 and 2A for opening and closing a puffer type load, and a cylindrical support member 5 having a movable electrode 4 therein is provided at the upper end thereof. . Then, the bellows 3 has the movable electrode 4
As it moves up and down, it expands and contracts in the vertical direction. Reference numeral 6 is a cylindrical insulating orifice cone provided at the tip of the support member 5 and having excellent arc resistance.

Reference numeral 7 denotes a grounding movable electrode, one end of which is electrically connected to the movable electrode 4, which is fixed to the lower end of the support member 5 and extends obliquely downward from one lower edge of the support member 5. Further, the lower end portion 8 is formed so as to face the vertical direction. A movable body M is formed by the movable electrode 4, the support member 5, and the grounding movable electrode 7.

Reference numeral 9 is a ground fixed electrode provided on the bottom surface of the case 1 directly below the ground movable electrode 7, and the movable electrode 4 is the first electrode.
It is located at the position shown in the figure, that is, approximately in the middle between the fixed electrode 11 and the fixed electrode 9 for grounding, which will be described later. When it reaches the position (grounding position) shown in FIG. 3, the lower end portion 8 of the grounding movable electrode 7 is closed to ground the movable electrode 4.

Reference numeral 10 denotes a fixed electrode arranged in each of the bellows 3, and the movable electrode 4 provided on the supporting member 5 is arranged at the tip end portion thereof so as to be vertically slidable. And
When the support member 5 is driven upward, the movable electrode 4 can connect between the fixed electrode 10 and a fixed electrode 11 described later. Incidentally, T is a transformer power supply withdrawing bushing provided adjacent to the bushing 2, and is electrically connected to a charging section in the bushing 2 in the case 1.

Reference numerals 11 and 11A denote male fixed electrodes that hang from the upper surface of the case 1 through an insulating support insulator 12 so as to correspond to the position directly above the movable electrode 4. When the movable electrode 4 moves upward from the position (open position) shown in FIG. 1 and reaches the position (insertion position) shown in FIG. 5, the movable electrode 4 is inserted into the movable electrode 4. There is. Reference numeral 13 is a connection conductor for electrically connecting the separate circuit fixed electrode 11A in phase with each fixed electrode 11.

The fixed electrodes 10 and the fixed electrodes 11 and 11A may be on the power source side or the load side in the multi-circuit switch depending on whether they are for main lines or for branching.

Reference numeral 15 is a connecting member made of an insulating material, through which the supporting members 5 for one circuit and three phases are fixed as shown in FIG.
Sliding pins 15a are projectingly provided at both ends thereof. Reference numeral 16 denotes a rotating shaft extending in the phase direction and rotatably installed in the center of the case 1, and the base ends of the long plate-shaped swing arms 17 and 18 are fixed to both ends thereof. ing. Both swing arms 17 and 18 are arranged such that the movable electrode 44 is substantially horizontal at the open position.

Reference numeral 19 is a long hole penetrating the tip ends of the swing arms 17 and 18 in the longitudinal direction thereof, and the sliding pin 15a is slidably inserted therein. Reference numeral 20 denotes a pair of connecting links pivotally attached to the central portion of the swing arm 18 on the rear side of the case 1 from both sides thereof by shafts 21, and the upper end side is an opening / closing provided through the upper surface of the case 1. It is axially attached to the inner end of the drive rod 22.

Therefore, when the movable electrode 4 is in the open position, the open / close drive rod is
When 22 is moved upward, the swing arm 18 is rotationally driven about the rotary shaft 16 in the clockwise direction shown in FIG. At this time, the rotary shaft 16 and the swing arm 17 are also driven to rotate in the same direction, and as a result, the support member 5 is driven upward via the sliding pin 15a, and the movable electrode 4 is inserted into the fixed electrode 11. It

Conversely, when the open / close drive rod 22 is driven downward, the swing arm
17,18 are driven to rotate counterclockwise. When the support member 5 is driven downward via the sliding pin 15a, the movable electrode 4 returns to the open position.

When the opening / closing drive rod 22 is moved downward in the open position, the movable electrode 4 is driven by the sliding pin 15a or the like to reach the grounding position, and the grounding movable electrode 7 is supplied to the ground fixed electrode 9. It has become so.

Reference numeral 31 indicated by an imaginary line in FIG. 1 is a mechanism case provided at the upper part of the switch case 1, in which an open / close mechanism section S for upwardly driving the open / close drive rod 22 and a ground switching mechanism E are installed. There is. Reference numeral 32 denotes an opening / closing operation lever provided in the front-back direction of the case 1 for performing a manual opening / closing operation. The base end of the opening / closing operation lever is fixed to a support shaft 32a linked to the opening / closing mechanism, and the tip end side is vertically moved. The tip end side of the opening / closing operation lever 32 is exposed to the outside of the mechanism section case 31 through a long hole 31a provided in the case section 31. The open / close operation lever 32 is oriented in the horizontal direction as shown in FIGS. 2 and 4 when the movable electrode 4 is in the open position. And
As shown in FIGS. 2 and 4, when the opening / closing operation lever 32 is operated downward (direction of arrow P), the opening / closing drive rod 22 is driven upward (direction of arrow Q).

On the contrary, as shown in FIG. 6, when the open / close operation lever 32 is operated from the horizontal state (open position) upward (in the direction of arrow R), the open / close drive rod 22 is driven downward (in the direction of arrow S).

Reference numeral 33 denotes a bellows, which is attached to a portion of the opening / closing rod 22 projecting from the upper surface of the case 1 and is used for maintaining airtightness in the case 1, and is provided in a support frame 34 in a reverse channel shape fixedly provided on the upper surface of the case 1. It is stored in. Reference numeral 35a denotes a disc-shaped locking member that is fixed to the upper portion of the opening / closing operating rod 22 that protrudes upward from the support frame 34, and that serves as the upper surface of the support frame 34 when the movable electrode 4 is moved to the grounding position. It comes to abut. Reference numeral 35b is a disc-shaped locking member fixed to the opening / closing drive rod 22 corresponding to the upper end surface of the bellows 33, which comes into contact with the upper surface of the support frame 34 when the movable electrode 4 is moved to the closing position. ing.

As shown in FIG. 2, reference numeral 36 denotes a grounding switching shaft provided in the front-rear direction with respect to the upper surface of the switch case 1, and both ends thereof are rotatably supported by bearing members 43 in front of the support frame 34. Has been done. Furthermore, while the front end of the ground switching shaft 36 is projected from the mechanism case 31 to the outside,
An operation portion 36a having a triangular prism shape is formed. The ground switching shaft 36 can be rotated from the outside of the mechanism case 31 by a triangular key (not shown) having a triangular hole that is detachably fitted to the operating portion 36a. The ground switching shaft 36 and the operating portion 36a constitute a ground switching mechanism E, which corresponds to the switching means of the present invention.

37 is the grounding switching shaft 36 near the front wall of the mechanism case 31
It is a first lock plate as a first lock member included in the operating position locking means L whose lower end is fixed to the front end.
Reference numeral 38 is a rectangular regulation groove cut out through an opening 38a provided on the left side of the central portion of the first lock plate 37. As shown in FIG. 4, the restriction groove 38 is provided on the ground switching shaft.
When 36 is set to the closing / opening operation position, the vertical movement range of the base end portion of the opening / closing operation lever 32 is restricted to lock the ground closing operation, and the opening / closing operation lever is locked.
32 is provided so as to be movable only between the closing operation position and the opening operation position.

Reference numeral 39 is a locking plate portion that is obliquely provided on the left side of the restriction groove 38 that is the lower portion of the opening 38a. Here, the fourth
From the state shown in the figure, rotate the ground switching shaft 36 to the right and
When the base end portion of the opening / closing operation lever 32 is disengaged from the opening 38 through the opening 38a, the ground switching shaft 36 is brought into the state shown in FIG. In this state, the upper surface of the locking plate 39 is substantially horizontal and the opening / closing operation lever 32
The closing operation is locked by restricting the downward movement of the opening / closing lever, and the opening / closing operation lever 32 is allowed only to move between the ground insertion position and the opening operation position.

The upper portion of the first lock plate 37 is connected to the mechanical case 31 through the upper portion of the elongated hole 31a when the grounding operation is locked.
It can be seen from the outside, the locking plate portion 39 can be also seen through the lower portion of the long hole 31a when the closing operation is locked, and the state of the ground switching shaft 36 can be known from outside the mechanism portion case 31. There is.

Reference numeral 40 denotes a second lock plate as a second lock member included in the operating position lock means L whose lower end is fixed to the rear end of the ground switching shaft 36, and is formed in an inverted triangular shape. . Reference numeral 41 denotes an inverted L-shaped lock piece protruding from the right side of the upper end of the second lock plate 40, and has a locking piece at its tip.
41a is formed, and when the ground switching shaft 36 is set to the closing / opening operation position shown in FIG. 4, it is arranged between the support frame 34 and the locking member 35a of the opening / closing drive rod 22. Has become. Then, in this state, the locking piece 41a restricts the downward movement of the locking member 35a, and prevents the opening / closing drive rod 22 from being driven in the grounding direction. 42 is the same as the second
Is a reverse L-shaped lock piece protruding from the upper left side of the lock plate 40, and the locking piece 42a formed at the tip of the lock plate 40 rotates the ground switching shaft 36 from the state shown in FIG. 4 to the right side. Then, in the state of being set to the grounding opening operation position shown in FIG. 6, it is arranged on the upper side of the locking member 35a, alternating with the locking piece 41a. In this state, the upward movement of the locking member 35a is restricted, and the opening / closing drive rod 22 is prevented from being driven in the closing direction. The first lock plate
The operating position locking means L is constituted by 37 and the second locking plate 40.

Now, the operation of the grounding device in the switch configured as described above will be described.

First, in the state where the movable electrode 4 is in the open position shown in FIG. 1, in order to insert the movable electrode 4 into the fixed electrode 11, the operation portion 36a of the ground switching shaft 36 is operated by the triangular key to make the first operation. Set to the opening / closing operation position shown in the figure. In this state, the restriction groove 38 of the first lock plate 37 restricts the range of vertical movement of the base end portion of the opening / closing operation lever 32 between the closing operation position and the opening operation position. At the same time, the locking piece 41a of the second lock plate 40 provided at the rear end portion of the ground switching shaft 36 is disposed below the locking member 35a, and restricts the downward movement of the opening / closing drive rod 22 to ground. Prevents driving in the closing direction. Therefore, when the opening / closing operation lever 32 is operated to open / close, the movable electrode 4 is closed. In this state, since the opening / closing operation lever 32 cannot be operated upward, the movable electrode 4 is not driven to the ground closing position.

When the opening / closing operation lever 32 is operated upward from the closed state, the movable electrode 4 returns to the open position again.

Next, when the movable electrode 4 is driven from the open position to the ground closing position, the operating portion 36a of the ground switching shaft 36 is rotated rightward to be set to the ground closing opening position shown in FIG. . In this state, the base end portion of the opening / closing operation lever 32 is disengaged from the restriction groove 38 of the first lock plate 37 through the opening 38a, and the locking plate portion 39 restricts the downward movement to the closing operation position. Cannot be driven. At the same time, the locking piece 42 of the second lock plate 40 provided at the rear end of the ground switching shaft 36.
The a is replaced by the locking piece 41a on the right side, and by being arranged above the locking member 35a, the opening / closing drive rod 22 is restricted from moving upward and cannot be driven in the closing direction.

Therefore, the opening / closing operation lever 32 is accidentally driven upward without being driven to the insertion operation position, so that the lower end portion 8 of the ground movable electrode 7 provided on the movable electrode 4 is closed to the ground fixed electrode 9. To be done. When the open / close operation lever 32 is operated downward from the grounded state, the movable electrode 4 returns to the open position again, and the lower end 8 of the movable electrode 7 for grounding is separated from the fixed electrode 9 for grounding.

Thus, when the movable electrode 4 is grounded, the ground switching shaft
The operation part 36a of 36 must be rotated to the right,
Further, once the movable electrode 4 is once rotated to the right, the movable electrode 4 will not be accidentally closed and driven when the movable electrode 4 is grounded. Since the operation portion 36a of the ground switching shaft 36 has a triangular prism shape, it is difficult to operate it with bare hands without using a triangular key or the like.
Since it is locked and has a structure that cannot be operated, erroneous operation can be prevented, and it is possible to prevent the ground switching shaft 36 from being set to the ground closing and opening operation position by mistake.

Further, since the ground fixed electrode 9 is provided on the opposite side of the fixed electrode 11 across the movable electrode 4 and the ground movable electrode 7 in the open position, the ground movable electrode 7 further extends the movable electrode 4 from the open position. It is thrown only when it is driven to the opposite side. Therefore, when the movable electrode 4 is turned on, there is no danger that the lower end portion 8 of the grounding movable electrode 7 is turned on to the ground fixed electrode 9 and the movable electrode 4 is simultaneously grounded.

Further, even if the movable ground electrode 7 and the fixed ground electrode 9 for grounding the movable electrode 4 are provided inside the case 1 in which the arc extinguishing gas is sealed, the movable electrode is easily grounded inside the case 1. be able to. Further, the first lock plate 37 is attached to the base end portion of the opening / closing operation lever 32 provided outside the case 1 and the opening / closing drive rod 22 provided through the inside and outside of the case 1.
Since the second lock plate 40 is provided, it is not necessary to newly provide a member for penetrating the inside and the outside of the case 1 for the locking means, and the arc extinguishing gas does not leak by the locking means.

The present invention is not limited to the above embodiment,
Instead of the second clock plate 40, as shown in FIG. 7, a long hole 45 is formed on an arc centered on the rotary shaft 16 with respect to the base end of the swing arm 17 that directly drives the load side movable electrode 4. To provide. When the movable electrode 4 is in the open position and the ground switching shaft 36 is installed in the closing / opening operation position, the lock pin 46 is inserted into the upper end of the long hole 45 from the front side of the case 1. When the movable electrode 4 is driven to the closing position, the lock pin 46 is brought into contact with the lower end of the long hole 45, and the swing arm 17 is moved.
Is locked between the closing position and the opening position.

Further, as shown in FIG. 8, when the movable electrode 4 is in the open position and the ground switching shaft 36 is set in the ground opening / opening operation position, instead of the lock pin 46, the front surface of the case 1 with respect to the lower end of the elongated hole 45. Insert the lock pin 47 from the side. Then, when the movable electrode 4 is driven to the grounding position, the elongated hole is formed.
The lock pin 47 is brought into contact with the upper end of 45, and the rocking arm 17 is locked between the cut position and the ground contacting position.For example, the lock pin 47 may be arbitrarily changed without departing from the spirit of the present invention. Good.

EFFECTS OF THE INVENTION As described in detail above, the present invention is provided with the lock means for locking the opening / closing operation mechanism for driving the movable electrode at the operation position of either the opening / closing operation or the grounding / opening operation. Since a switching means for switching to one of the operating position lock states is provided, there is no need to perform grounding operation with the movable electrode being inserted in the fixed electrode during opening / closing operation, and industrial operation where operation is safe and reliable Excellent effect.

Further, according to the present invention, even if the power supply direction of the power distribution line is changed, according to the present invention, it is possible to selectively perform grounding / opening from the open state of the switch, so that it can be safely used without any problem.

Further, the first lock member allows the opening / closing lock of the switch or the grounding / open lock to be selectively performed on the operation input side of the operation mechanism. This allows the operator to be informed of the locked state.

Further, the second lock member allows the opening / closing lock of the switch or the grounding / open lock to be selectively performed on the output side of the operating mechanism. As a result, it is possible to reliably maintain the locked state even on the mechanism side.

[Brief description of drawings]

1 to 6 show a first embodiment, FIG. 1 is a front sectional view of a gas multi-circuit switch, FIG. 2 is a side sectional view of the same, and FIG.
FIG. 4 is a cross-sectional view of the main part when the movable electrode is grounded, FIG. 4 is a perspective view of the main part showing the locking means and switching means, FIG. 5 is a cross-sectional view of the main part when the movable electrode is closed, and FIG. 7 and 8 show another example, FIG. 7 shows the locking means in the closing / opening operation position, and FIG. 8 shows the locking means in the grounding opening / closing operation position. It is a figure. 1 ... Case, 4 ... Movable electrode, 7 ... Grounding movable electrode, 9 ... Grounded fixed electrode, 10, 11, 11A ... Fixed electrode, 22,
32 …… Opening / closing operation mechanism, 36,36a …… Switching means, 37,40,45,4
6,47 ... Locking means, E ... ground switching mechanism, M ... movable body, S ... opening / closing mechanism section.

Claims (1)

[Claims] 1. A pair of fixed electrodes (10, 11) arranged in a switch case are always electrically connected to the one fixed electrode (10) and to the other fixed electrode (11). In a switch provided with a movable body (M) having a movable electrode that is opened and closed, a fixed electrode (10) side switch case inner side of the movable body (M) side is fixed on the movable body (M) side. The fixed electrode (9) for grounding is provided close to the electrode (10), and the movable body (M) is grounded in a direction opposite to the closing direction of the other fixed electrode (11) of the movable body (M). A movable electrode (7) for grounding is provided so that it can be grounded, and an operating mechanism (22,3) for opening and closing the movable body (M).
In 2), either the opening / closing operation from the opening position to the other fixed electrode (11) or the grounding / opening operation from the opening position to the grounding movable electrode (7) provided on the movable body (M). The operation position lock means (L) for allowing only the operation and locking the other operation is provided, and further, the lock means (L) is provided with the switching means (E) for switching to one of the clock states. The locking means (L) is an opening / closing operation to the other fixed electrode (11) from the open position, or a movement from the open position, on the operation input side of the operation mechanism (22, 32) in order to display a status to the operator. Body (M)
The first locking member (37) that allows only one of the grounding and opening operations to the grounding movable electrode (7) and locks the other operation, and the opening on the output side of the operating mechanism. Only the opening / closing operation from the position to the other fixed electrode (11) or the grounding / opening operation from the opening position to the grounding movable electrode (7) provided on the movable body (M) is permitted. And a second lock member (40) for locking the other movement of the grounding device in the switch.