CN102208759B - Switching device - Google Patents

Abstract

The invention relates to a switching device. The invention aims to provide a switching device with a simplified structure, which can prevent a ground switch from being turned on when a circuit is open or prevent a breaker from being turned on when the ground switch is turned on. The switching device (1) in the invention comprises a vacuum double-breakpoint three-position type switch (2) and a ground switch (5) making the load on a main circuit grounded from a side. The ground switch (5) comprises an operation part covered by a sliding door (10). The switching device (1) further comprises a linkage rod (11) for preventing the door (10) from freely sliding. The linkage rod (11) is released when the vacuum double-breakpoint three-position type switch (2) is turned off. Then the door (10) can freely slide and the operation part can perform operation.

Description

switchgear

technical field

The present invention relates to a switchgear capable of breaking and grounding current.

Background technique

Switchgear is a device for receiving current from the busbar side and supplying current to the load side. It is equipped with disconnectors, circuit breakers, and grounding switches to make the current on, off, and off, or to ground the current during maintenance.

However, when the main circuit is not disconnected, that is, when the current of the main circuit is in the ON state, or the current itself is disconnected, but the voltage is generated on the load side, if the grounding switch is turned on, it will cause A grounding accident where the bus side is grounded. In addition, if the circuit breaker is turned on when the grounding switch is turned on, it will still cause a grounding accident. Therefore, it is necessary to prevent the closing operation of the grounding switch when the main circuit is not disconnected in the switchgear, or to prevent the closing operation of the circuit breaker when the grounding switch is in the on state.

The switchgear described above is a prior art that prevents the earthing switch from being turned on when the main circuit is not disconnected, and prevents the circuit breaker from being turned on when the earthing switch is on. For example, there is Patent Document 1 documented technology. This patent document 1 (Japanese Unexamined Patent Application Publication No. 9-154208) describes a metal-enclosed switch in which the striker plate protrudes forward from the surface of the mounting plate when the grounding circuit breaker is turned on. A handle for turning on the grounding breaker is attached to a lever and a baffle that cannot swing clockwise due to a strike plate, thereby preventing the grounding switch from being turned on (Patent Document 1, paragraphs 0060 to 0062).

However, in the switchgear described in Patent Document 1, the link mechanism is complicated, and in consideration of maintainability and cost, it is more desirable to realize it with a simplified structure.

Contents of the invention

Therefore, the first object of the present invention is to provide a switchgear which, through a simplified structure, can prevent the earthing switch from being turned on when it is not disconnected, or when the earthing switch is in the on state , can prevent the circuit breaker from turning on.

In order to achieve the above-mentioned first problem, the switchgear of the present invention includes: a switch having at least a disconnection function, and a grounding switch for grounding the load side of the main circuit, characterized in that the grounding switch has an operation part covered by a sliding cover part The switchgear is further provided with an anti-slip part that prevents the cover part from sliding, and the anti-slip part is released when the switch is in the off position, the cover part can slide, and the operation part can be operated.

Effect of the present invention.

According to the switchgear to achieve the first object of the present invention, the simplified structure can prevent the earthing switch from being turned on when the circuit is not broken, or prevent the circuit breaker from being activated when the earthing switch is in the on state. connection action.

Description of drawings

Fig. 1 is a side sectional view of a switchgear.

Fig. 2 is a diagram for explaining a breaking operator and a grounding operator.

Fig. 3 is a diagram for explaining an interlock mechanism using a door.

Fig. 4 is a diagram illustrating the mutual interlocking of the disconnecting operator and the grounding operator, and is a diagram showing the state of being in the disconnected position and the grounded position.

Fig. 5 is a diagram illustrating the mutual interlocking of the disconnecting operator and the grounding operator, and is a diagram showing a state in a non-disconnecting position and a non-grounding position.

Fig. 6 is a plan view of a grounding operator and a breaking operator, and is a diagram for explaining electric interlocking.

Fig. 7 is a diagram showing a grounding operation mechanism.

Fig. 8 is a diagram showing a stop mechanism of a circuit breaker.

In the picture:

1-Switch device, 2-vacuum double break point three-position switch, 3-busbar, 4-cable, 5-earth switch, 6-disconnect operator, 7-break operator, 9-stopper, 10-door , 11-lock lever, 12-lock pin, 13-return spring, 14-push part, 15-on and off operation stop mechanism, 16-voltage detector, 17-through hole, 18-electromagnetic lock switch , 19-prevent on and off switch, 20-indicator metal parts, 21-rod rotation shaft, 22-rod support part, 23-upper rod, 24-grounding operator, 25-operating part, 26-extend Department, 27 - Operating lever.

Detailed ways

Examples of the present invention will be described below.

Example 1

Example 1 will be described using FIGS. 1 to 6 . As shown in Figure 1, the switchgear 1 of the present invention can switch the three positions of on, off, and off in a vacuum-insulated state. A double-break three-position switch 2; a grounding switch 5 connected to the load side of the vacuum double-break three-position switch 2 and grounding the load side of the main circuit; supplying power to the vacuum double-break three-position switch 2 A bus bar 3; and a cable 4 for supplying power from the vacuum double break three-position switch 2 to the load side.

The vacuum double-break three-position switch 2 is provided with a break operator 6 for switching between on-off positions and a break operator 7 for switching between off-off positions. As shown in FIG. 2 , there is an interlocking lever 11 on the circuit breaker 7, and the interlocking lever 11 is rotatably fixed on the lever rotation shaft 21 at the center of the lever. The lever rotation axis 21 is supported on the It is fixed on the rod supporting part 22 on the main body of the circuit breaker 7 . One end of the interlock lever 11 is connected to an upper rod 23 protruding upward from the disconnection operator 7, and the upper rod 23 enters the inner side of the disconnection operator 7 as shown in FIG. 4 when the main circuit is in the disconnection position. When the main circuit is in the non-breaking position, as shown in FIG. 5 , it can move up and down so that it can be located in a direction protruding upward from the breaking operator 7 . As mentioned above, the interlocking lever 11 is rotatably fixed on the lever rotating shaft 21 at the center of the lever. Since one end is connected with the upper lever 23, the position of the upper lever 23 is in the The vertical direction changes, and when the main circuit is in the non-off position, it rotates approximately horizontally as shown in FIG. Square rotation. In addition, a voltage detector 16 capable of detecting the voltage of the load side of the main circuit is provided on the load side in the vacuum double break three-position switch 2 .

In addition, as shown in FIG. 1 , the grounding switch 5 is provided with a grounding operator 24 for switching the ON-OFF state. As shown in FIG. Operation part 25 to carry out. In addition, the door 10 covers the front portion so as not to cause a ground accident due to erroneous operation of the operation portion 25 . A guide rail is laid on the door 10 so as to be slidable, and in order to operate the grounding operator 24 , it is necessary to open the door 10 and operate the operation part 25 . The operation portion 25 is an insertion hole for a handle, and the grounding operator 24 is operated by inserting the handle into the insertion hole in a state where the door 10 is opened. Regarding the door 10, the return spring 13 fixed on the disc is set on the door 10, so that even if the door is opened by mistake, it will not continue to open. The door 10 in this embodiment is shown in Figure 2. Inside the switchgear 1, the front end becomes a protruding extension 26. When the door 10 slides, the main circuit is in the on and off position. The rod 11 comes into contact with the protruding portion 26 and prevents sliding of the door 10 . In addition, as shown in FIG. 6 , the door 10 is provided with a convex portion inwardly, that is, a push portion 14, and the inside of the switchgear 1 is pushed by the push portion 14 when the door 10 slides, and it is sent out and cannot be operated. Vacuum double-break point three-position type switch 2 is switched on and off to operate the stop mechanism 15 . In addition, a through hole 17 is provided in the door 10 , and an electromagnetic lock switch 18 provided inside the switchgear 1 and operated based on the detection result of the voltage detector 16 can pass through the through hole 17 . In addition, the interlock pin 12 protrudes from the grounding operator 24 to the interlock lever 11 side of the above-mentioned vacuum double-break three-position switch 2, as shown in Figure 4, when the grounding switch 5 is turned on, the interlock pin 12 moves to the lower left , as shown in Figure 5, when in the disconnected state, the locking pin 12 moves to the upper right. And the locking pin 12 is only limited to the situation that the locking lever 11 is at the top, and itself can move to the lower left. On the contrary, the locking rod 11 can only move horizontally when the locking pin 12 is in the upper right position. That is, the locking lever 11 and the locking pin 12 have a mutual interlocking function. As shown in FIG. 7 , an indicator metal part 20 is provided on the operating lever 27 driven when the grounding operator 24 is operated. The action prevents the vacuum double-break point three-position switch 2 from being turned on or off, thereby preventing the main circuit switch from moving to the on or off position.

The operations performed by the above-mentioned operators will be described. The off operator 6 is an operator that provides an operating force from on-off to breaking to the vacuum double-break three-position switch 2, and has an operating force to separate the electrodes at one time from the on position to the off position. However, if it moves from the on position to the off position without stopping at the off position, it may be at the off position in a state where the current is not interrupted. Therefore, the stopper 9, which is a fixing member provided on the disconnection operator 7, is stopped at the distance between the electrodes at the disconnected position, and the current is reliably disconnected, so as to prevent the current from being stopped at the disconnected position from the switched-on position once until The break position is open. When operating from the disconnected position to the disconnected position, if the stopper 9 is rotated and released, the operating force of the disconnected operator 6 will move to the disconnected position. Square rotation. In addition, this rotational movement of the stopper 9 is described in FIG. 8 .

On the other hand, the operation from the disconnection position to the disconnection position is performed by the operating force of the disconnection operator 7 . Specifically, since the opening operator 6 acts an operating force in the opening direction, the opening operator 7 applies an operating force greater than the operating force of the opening operator 6 to drive the stopper 9 to move to the opening position. At this time, the chain lever 11 rotates substantially horizontally in conjunction with the operation of the stopper 9 .

And, the operation from OFF to ON is performed by the operating force of the OFF operator 6 .

In addition, switching of the on-off state of the grounding switch 5 is performed by the operating force of the grounding operator 24 .

In the switchgear of this embodiment, when the main circuit is not disconnected, there will be no grounding accident on the bus side when the grounding switch is turned on. The specific method will be described below. In addition, as described below, the reason why multiple mechanisms are provided to prevent grounding accidents is that in switchgears, accidents that cause grounding on the bus side are a very serious problem, even if they happen.

First, the anti-skid mechanism of the door 10 using the link lever 11 is demonstrated using FIG.4 and FIG.5. As mentioned above, if you want to operate the grounding switch 5, you need to open the door 10 to operate the operation part 25 equipped on the front part of the grounding switch 5, but when the vacuum double-break three-position switch 2 is in the on and off position As shown in FIG. 5 , the locking lever 11 is oriented in a substantially horizontal direction to block the sliding course of the protruding portion 26 as a part of the door 10 , thereby preventing the sliding of the door 10 . At this time, the chain lever 11 functions as an anti-slip portion with respect to the door 10 . When the door 10 is opened when the lock lever 11 is oriented substantially horizontally, the protruding portion 26 hits the lock lever 11 and prevents sliding, so that the door 10 cannot be opened.

On the other hand, as shown in FIG. 4 , when the vacuum double-break three-position switch 2 is in the off-circuit position, the interlock lever 11 faces upward, and the sliding action of the door 10 is in a state where the interlock is released. In this case, the locking lever 11 will not block the sliding advance route of the door 10 .

By satisfying the above relationship, in the switchgear 1 of this embodiment, only when the vacuum double-break three-position switch 2 is in the disconnection position, the operation part 25 can be operated and the grounding switch 5 can be turned on. This mechanism is referred to as a mechanical interlock in this specification.

Next, the anti-slip mechanism of the door 10 using the electromagnetic lock switch 18 will be described. As in the case of the above-mentioned interlock lever 11, in order to operate the earthing switch 5, it is necessary to open the door 10 to operate the operation part provided on the front part of the earthing switch 5, but a positive or negative voltage other than 0 is detected by the voltage detector 16. In the case of , the electromagnetic lock switch 18 operates and passes through the through hole 17 provided on the door 10 to prevent the door 10 from sliding. Here, when the voltage detector 16 detects a positive or negative voltage other than 0, it means that the main circuit is in a charged state, that is, it corresponds to not being in a disconnected state. Therefore, in the switchgear 1 of this embodiment, the door 10 can be opened, the operation part can be operated, and the grounding switch 5 can be turned on only when the vacuum double-break three-position switch 2 is in the off state. This mechanism is referred to as an electric chain in this specification.

The above-mentioned mechanical interlock and electric interlock are interlocks that operate through independent and different mechanisms respectively. That is, the mechanical interlock is only limited to the vacuum double-break point three-position type switch 2 in the open circuit position, allowing the door 10 to be opened, and as a result, the grounding switch 5 can be actuated. Detect whether the main circuit is in a charged state, and the main circuit is not in a charged state, that is, in an open circuit state, the door 10 is allowed to be opened, and the grounding switch 5 can be operated as a result. In this way, by providing a plurality of interlocking mechanisms independent of each other, even if one malfunctions, the other can be in an operating state, realizing a fail-safe function that can reliably prevent grounding accidents.

The mechanism above prevents the door 10 from being opened, so that it is limited to the situation that the main circuit is in the disconnected position and in the disconnected state, so as to ensure that the grounding switch 5 can be operated. The third interlocking mechanism that interlocking pin 12 forms, so that also can prevent grounding accident even under the situation that causes door 10 to open because of something. The organization is described below.

As mentioned above, the chain lever 11 faces the horizontal direction when the main circuit is not in the disconnected position. On the other hand, the interlock pin 12 moves downward to the left when the grounding switch 5 is turned on. In addition, the locking pin 12 can only move downward to the left when the locking lever 11 is oriented in the horizontal direction. As a result, the movement of the interlocking pin 12 is only limited to the situation that the vacuum double-break three-position switch 2 is disconnected and can be realized, that is, the connection action of the grounding switch 5 is only limited to the situation that the vacuum double-break three-position switch 2 is in the disconnected position. accomplish. Thus, a new fail-safe function added on the above-mentioned fail-safe idea is brought into play.

So far, the grounding switch 5 cannot be turned on if the main circuit is not disconnected, thus referring to the various mechanisms for preventing grounding accidents. However, as a ground fault mode, in addition to this, when the grounding switch 5 is already in the ON state, the vacuum double-break three-position switch 2 may be switched from OFF to OFF and ON. Therefore, in order to prevent ground faults, it is also necessary to prevent the ground faults. Reference is made to this institution below.

First, the on/off operation mechanism of the vacuum prevention double-break three-position type switch 2 when the grounding switch 5 of the door 10 is turned on will be described. In the switchgear 1 of the present embodiment, when the grounding switch 5 is turned on, the door 10 of FIG. 6 is in an open state. Here, the door 10 is provided with a pressing portion 14 , and the ON/OFF operation stop mechanism 15 is pressed by the pressing portion 14 in a state where the door 10 is opened. When the ON/OFF operation stop mechanism 15 is pushed by the pressing part 14, it outputs a command that the operation of the OFF operator 6 and the OFF operator 7 cannot be performed, so that the vacuum double-break three-position switch 2 cannot be operated. In this way, when the grounding switch 5 is turned on, that is, when the door 10 is opened, the vacuum double-break three-position switch 2 cannot be operated, and since it cannot move to the on position and the off position, grounding accidents can be prevented.

Next, the interlock mechanism using the interlock pin 12 will be described. First, as shown in FIG. 4 , the interlock pin 12 faces downward and leftward when the grounding switch 5 is turned on. And, to make the vacuum double-break point three-position type switch 2 move from the disconnection position to the on and off position, then as shown in Figure 5, the locking lever 11 needs to face the horizontal direction, but the locking lever 11 is only limited to the locking pin 12 In the upper right case, you can move horizontally. However, since the interlock pin 12 faces downward to the left when the grounding switch 5 is turned on, the interlock lever 11 cannot move horizontally. In this way, when the grounding switch 5 is turned on, the vacuum double-break three-position switch 2 cannot be moved from the disconnection position to the on-off position.

Furthermore, the on/off mechanism of the anti-vacuum double-break three-position type switch 2 using the anti-on/off switch 19 provided on the operating rod 27 connected to the grounding operator 24 will be described. As shown in FIG. 7 , an indicator metal fitting 20 is provided on an operating lever 27 that is driven when operated by the grounding operator 24 , and an ON/OFF prevention switch 19 is provided at a position fixed to the operating lever 27 . When the grounding switch 5 is turned on, the operating rod 27 descends downward, and pushes the switch 19 to prevent turning on and off. When the on/off prevention switch 19 is pushed, a command to fix the off position to the vacuum double-break three-position switch 2 is sent from the switch, so the on/off operation cannot be performed.

Through the above mechanisms, it is possible to prevent the earthing switch 5 from being turned on when the vacuum double-break three-position switch 2 is turned on and off, thereby preventing a grounding accident. According to the switchgear of the present embodiment described above, by using a simple structure with a small number of parts and components, when the main circuit is not disconnected, it is possible to prevent the earthing switch from being turned on, and when the earthing switch is in the on state, , can prevent the circuit breaker from turning on. In addition, since the voltage detector 16 is provided and the electric interlock using the electromagnetic lock switch 18 functions based on the voltage, it is possible to detect a voltage remaining on the load side even when the main circuit is in the disconnected position. To prevent the grounding switch 5 from being turned on.

In the present embodiment, by preventing the door 10 itself covering the grounding operator 24 from sliding, it is possible to prevent grounding accidents. There is no extra increase in the number of parts due to interlocking. In addition, as for the interlock mechanism, in addition to the door covering the ground operator 24 , an interlock mechanism can be realized by providing a new slide-type covering portion for covering the ground operator 24 . In this case, compared with the case where the door 10 has an interlocking function, although the number of parts is increased, the mechanism is simplified similarly to the case of the door 10, and the increase in the number of parts is limited to a minimum, and a complicated structure can be prevented. .

In this embodiment, although a rotary member has been described as the locking lever 11, it does not have to be a rotary type, as long as the door can be slid when it is in the off position, and it is in the case of the on and off positions. As long as it can prevent the door from sliding, as a more specific example, for a sliding door, when it is in the on or off position, the anti-slip mechanism is located in a position that hinders its advancing route, and it is only limited to the situation in the off position Next, the anti-skid mechanism is located at a position that does not hinder the forward route of the door.

In this embodiment, a double-break switch is used as a switch, which is advantageous in that the distance between electrodes can be shortened and the size of the switchgear can be reduced. However, the above-mentioned interlocking mechanisms are applicable no matter whether they are double breakpoints or not.

In the present embodiment, by using the return spring 13 , an elastic force acting in the direction of covering the operation portion is generated on the door 10 . This prevents the door 10 from being maintained in an open state. However, it goes without saying that the spring is not limited to the return spring as long as it is an elastic body or the like that can achieve this effect.

In this embodiment, based on the voltage detected by the voltage detector 16, the electromagnetic lock switch 18 penetrates the door 10 so that the door 10 cannot be slid to perform electric interlocking. , and when it is determined by the unit that a voltage is applied, the grounding switch 5 may not be turned on based on an instruction from the unit. It goes without saying that what is disclosed in this embodiment is always only an embodiment.

In this embodiment, the locking lever 11 and the locking pin 12 hinder each other's movement. Therefore, since the earthing switch 5 or the vacuum double-break three-position switch 2 exerts an interlocking function for the actions of each operator, it is used as an interlocking mechanism that restricts the action of the other movable electrode, so that the number of parts can be reduced. . However, even if there is also a unit that operates in response to the operation of the switch (including at least the disconnection function; the same applies hereinafter), and when the switch is not disconnected, the interlock pin 12 of the grounding switch 5 cannot move to the position when it is turned on. and corresponding to the action of the earthing switch, and when the earthing switch is in the on position, the unit that the locking lever 11 cannot move to the position when it is turned on or off can also realize the above-mentioned interlocking mechanism. In addition, the interlock lever 11 is not limited to the interlock lever, as long as it is always operated corresponding to the action of the vacuum double-break three-position switch 2, when the vacuum double-break three-position switch 2 is not in the disconnecting position What is necessary is just to prevent the movement of the interlock pin 12 from OFF to ON when the grounding switch 5 is ON. In addition, as for the interlock pin 12, as long as it operates together with the switching action of the earthing switch 5 when the earthing switch 5 is turned on-off, when the earthing switch 5 is in the on position, it prevents vacuum double-break point three-position It is only necessary for the movement operation of the interlock lever 11 when the type switch 2 moves from the disconnection position to a position other than the disconnection position.

In the present embodiment, the door 10 is provided with a push portion 14, and when the door 10 is opened, the on and off operation stop mechanism 15 is pushed by the push portion 14, so that the vacuum double-breakpoint three-position The case where type switch 2 cannot be operated is explained as an example. However, it is not limited to this example, and it is not limited to the door as described above, as long as it is equipped with an operation corresponding to the slide-type cover portion, and slides on the slide-type cover portion to make the grounding switch 5 in an operable state. Next, the unit that sends the command that the grounding switch cannot be turned on will suffice.

Example 2

In the above-mentioned first embodiment, the vacuum double-break three-position switch 2 having both opening and breaking functions has been described as an example, but it is also possible to separate the disconnector and the circuit breaker. In this case, each interlock described in Embodiment 1 may be configured between the circuit breaker and the grounding switch 5 . In addition, illustrations related to the present embodiment are omitted.

Specifically, first, it is only necessary to prevent the grounding switch 5 from being turned on when the circuit breaker is not disconnected. That is, when the circuit breaker moves from the OFF position to the ON position, the lock lever of the circuit breaker moves substantially horizontally to prevent the door 10 of the operation portion for operating the grounding operator 24 from opening. In addition, a voltage detector is arranged on the load side of the circuit breaker. When positive or negative voltage is detected by the voltage detector, it is judged that it is not in the disconnected state. In order to prevent the grounding operator 24 from being turned on, the electromagnetic lock The switch 18 penetrates through the through-hole 17 provided in the door 10, and prevents the door 10 for operating the operation part of the grounding operator 24 from opening. Also, even if the door 10 is opened when the circuit breaker is not in the off position due to some event, since the locking lever is in a substantially horizontal direction in this case, the locking pin is prevented from moving downward to the left, The grounding switch 5 can be prevented from being turned on.

Next, when the grounding switch 5 is turned on, it is only necessary to prevent the circuit breaker from being turned on. That is, the door 10 is provided with a push portion 14, and when the door 10 is opened, the on and off operation stop mechanism 15 is pushed by the push portion 14 provided on the door 10, and the vacuum double break point 3 cannot be operated. Position switch 2. Therefore, when the grounding switch 5 is turned on, that is, when the door 10 is opened, the vacuum double-break three-position switch 2 cannot be operated and cannot move to the on and off positions, so grounding accidents can be prevented. In addition, since the interlock pin faces downward and leftward when the grounding switch 5 is turned on, the interlock lever cannot move substantially horizontally. Therefore, when the grounding switch 5 is turned on, it is possible to prevent the vacuum double-break three-position switch 2 from moving from the off position to the on and off positions. In addition, as in the first embodiment, an on/off prevention switch 19 is provided on the operating lever provided on the earthing switch 5, and the on/off prevention switch 19 operates when the earthing switch 5 is in the on position. Therefore, when the grounding switch 5 is in the ON position, the vacuum double-break three-position switch 2 cannot be turned on or off.

As described above, each interlock mechanism described in Embodiment 1 can be applied even when the breaker is separated from the circuit breaker. Even in the switchgear of this embodiment, as in Embodiment 1, the number of components is reduced and the simplified structure can prevent the earthing switch from being turned on when the circuit is not disconnected, and when the earthing switch is in the earthing switch state, the earthing switch is connected. In the ON state, the closing operation of the circuit breaker can be prevented. In addition, since a voltage detector is provided and the interlock operation using the electromagnetic lock switch 18 is performed based on the voltage, it is possible to prevent the grounding switch 5 from being turned on even when a voltage remains on the load side.

Claims (7)

1. a switchgear, possesses: at least there is the switch of cut-out function, by the earthed switch of the load-side ground connection of major loop, and detects the voltage detector of the load side voltage of above-mentioned major loop, it is characterized in that,

Above-mentioned earthed switch possesses the operating portion being covered by slidingtype covering part, and above-mentioned switchgear also possesses the anti-skidding portion that prevents that above-mentioned covering part from sliding,

Above-mentioned switch possesses open-circuit operation device, and above-mentioned earthed switch possesses ground connection operator,

Above-mentioned anti-skidding portion is provided on above-mentioned open-circuit operation device,

Above-mentioned covering part is the sliding door that covers aforesaid operations portion;

Above-mentioned anti-skidding portion prevents the slip of above-mentioned sliding door by pushing, and above-mentioned anti-skidding portion comprises: be arranged on above-mentioned switchgear inside, stretched out and the extension that forms and be arranged on the latch lever on open-circuit operation device by the front end of above-mentioned door;

Above-mentioned latch lever moves corresponding to the action of above-mentioned switch, and at above-mentioned switch, not in off position in the situation that, above-mentioned latch lever contacts with above-mentioned extension, hinders the slip of above-mentioned door; And be disengaged in off position in the situation that at above-mentioned switch, above-mentioned door can slide, and aforesaid operations portion can operate,

Possess the on-unit of preventing, this prevents that on-unit is connected with this voltage detector, in the situation that detecting plus or minus voltage by this voltage detector, prevents earthed switch connection.

2. switchgear according to claim 1, is characterized in that,

In the manipulable situation of aforesaid operations portion, above-mentioned covering part effect is covered to the elastic force of the direction of aforesaid operations portion.

3. switchgear according to claim 1, is characterized in that,

Above-mentioned switch be there is connection, the switch of this three position that disconnects, opens circuit, this switch possesses by the stopper driving and move in the time that off position moves from open position, and above-mentioned anti-skidding portion is in the time that the open position from above-mentioned switch moves to off position and the action of above-mentioned stopper interlock and moving.

4. switchgear according to claim 1, is characterized in that,

Above-mentionedly prevent that on-unit from being the unit that prevents that above-mentioned covering part from moving.

5. switchgear according to claim 1, is characterized in that,

Above-mentionedly prevent that on-unit from, in the situation that above-mentioned voltage detector detects plus or minus voltage, preventing the slip of above-mentioned covering part.

6. a switchgear, possess: the switch at least with cut-out function, by the earthed switch of the load-side ground connection of major loop, and detect the voltage detector of the load side voltage of above-mentioned major loop, it is characterized in that, above-mentioned earthed switch possesses the operating portion being covered by slidingtype covering part, and above-mentioned switchgear also possesses:

Prevent the anti-skidding portion that above-mentioned covering part is slided,

Above-mentioned switch possesses open-circuit operation device, and above-mentioned earthed switch possesses ground connection operator,

Above-mentioned anti-skidding portion is provided on above-mentioned open-circuit operation device,

Above-mentioned covering part is the sliding door that covers aforesaid operations portion,

In the case of being detected the voltage of plus or minus by above-mentioned voltage detector, prevent the on-unit that prevents that moves and prevent earthed switch connection of above-mentioned covering part,

Above-mentioned anti-skidding portion is disengaged in off position in the situation that at above-mentioned switch,

And above-mentionedly prevent that on-unit is disengaged in the situation that not detecting plus or minus voltage by above-mentioned voltage detector, aforesaid operations portion can operate,

Above-mentioned anti-skidding portion prevents the slip of above-mentioned sliding door by pushing, and above-mentioned anti-skidding portion comprises: be arranged on above-mentioned switchgear inside, stretched out and the extension that forms and be arranged on the latch lever on open-circuit operation device by the front end of above-mentioned door,

Above-mentioned latch lever moves corresponding to the action of above-mentioned switch, and above-mentioned switch is not in the situation in off position, and above-mentioned latch lever contacts with above-mentioned extension, hinders the slip of above-mentioned door; And be disengaged in off position in the situation that at above-mentioned switch, above-mentioned door can slide.

7. a switchgear, possess: the double breaking points switch at least with the vacuum insulation of connection and off position, by the load-side ground connection of major loop and there is the earthed switch of connection, open position, and detect the voltage detector of the load side voltage of above-mentioned major loop, it is characterized in that, this switchgear also possesses:

The operating portion that above-mentioned earthed switch is covered by the door of slidingtype;

Prevent the anti-skidding portion that above-mentioned door slides,

Above-mentioned anti-skidding portion comprises: be arranged on above-mentioned switchgear inside, stretched out and the extension that forms and be arranged on the latch lever on open-circuit operation device by the front end of above-mentioned door,

Above-mentioned latch lever is arranged on open-circuit operation device;

In the time of the on-off of the above-mentioned earthed switch of conversion, with the chain pin moving together with the switching motion of the on-off of above-mentioned earthed switch; And

Be connected with above-mentioned voltage detector, in the situation that detecting plus or minus voltage by above-mentioned voltage detector, prevent the electromagnetic type locking switch that above-mentioned earthed switch is connected;

Above-mentioned latch lever moves corresponding to the action of above-mentioned switch, at above-mentioned switch not in off position in the situation that, above-mentioned latch lever be arranged on above-mentioned switchgear inside, stretched out and the extension that forms contacts by the front end of above-mentioned door, hinder the slip of above-mentioned door, prevent the above-mentioned action of above-mentioned chain pin when above-mentioned earthed switch is connected, and be disengaged in off position in the situation that at above-mentioned switch, above-mentioned door can slide.