JPH1169517A - Closed switchboard for electric power - Google Patents

Abstract

(57) [Problem] To improve a closed switchboard provided with a grounding switch so as to ensure the safety of maintenance and inspection work of a cable room defined in the panel. A control room, a bus room, and a control room are provided in a panel with a front door.
Breaker room 4. And a grounding switch 13 incorporated in the cable room, and a closed switchboard for electric power in which the operating end of the main operation shaft 15 of the grounding switch is arranged to face the front of the panel. The grounding switch can be opened and closed only between the front door 5a and the main operation shaft 15 of the grounding switch when the outer door is closed. A first interlock mechanism 17 that locks the main operation shaft of the grounding switch so that it cannot be operated, and a state in which the jacket door can be opened only when the grounding switch is in a closed state, and the grounding switch is disconnected. And a second interlock mechanism 18 for locking the jacket door to the closed position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed power distribution panel having a grounding switch in the panel.

[0002]

2. Description of the Related Art First, a conventional structure of a closed power distribution board for power shown in FIGS. In the drawing, reference numeral 1 denotes a cabinet of a switchboard with a front door constructed of a grounded metal plate, in which a control room 2, a busbar room 3, a circuit breaker room 4, and a cable room 5 are provided.
Are formed via partition walls, and cover doors 2a, 4a, 5a each serving as a one-sided door corresponding to the control room 2, the breaker room 4, and the cable room 5 are respectively provided on the front surface of the housing 1. Equipped. The outer door 2a of the control room 2 is
b, while the doors 4a, 5a of the circuit breaker room 4 and the cable room 5 are fastened to the closed position by bolts 4b, 5b so that the door cannot be opened freely. ing.

Here, a control panel 6 is provided in the control room 2, a common busbar 8 supported by an inter-panel bushing 7 is provided in the busbar room 3, a circuit breaker 9 is provided in the circuit breaker room 4, and a circuit breaker 9 is provided in the cable room 5. A lightning arrester 11, a CT 12, and a grounding switch 13 are incorporated in addition to a cable (load side) 10 for connecting to a load-side device. In addition, circuit breaker room 4, bus room 3, cable room 5
The partition between the power supply and the circuit breaker 9 is provided with a disconnecting portion 14 on the power supply side and the load side connected to the circuit breaker 9. Note that the circuit breaker 9 can be moved in the front-rear direction between an operation position indicated by a solid gland and a disconnection (test) position indicated by a chain line, and the terminal of the interruption unit is plugged into the disconnection unit 14 at the operation position. Connected. In addition, the grounding switch 13 is always kept in an open circuit state,
When the circuit breaker 9 is moved to the disconnecting position and the inside of the panel is maintained and inspected, the grounding switch 13 is turned on to ground the load-side cable 10 and the disconnecting section 14 to the ground side, and the load-side main circuit is not charged. It plays a role in ensuring the safety of maintenance personnel working inside the panel.

Further, a main operation shaft 15 for opening and closing the grounding switch 13 from the outside is arranged on the ceiling side of the cable room 5 in the front-rear direction, and the front surface of the housing 1 is opposed to its front end. An operation window 1 with a small door on the front surface (bent in a U-shaped section) of the base frame 16 of the circuit breaker 9
6a is open. Here, as shown in FIGS. 7 (a) and 7 (b), the main operation shaft 15 of the grounding switch 13 has a coupling pin 15a which is coupled to an operation handle (not shown) at the tip.
Is rotatably supported (the rotation angle is restricted to about 90 degrees) via a bearing 15b and a stopper 15c, and a grounding switch is provided at its rear end via a crank arm 15d. 13 is provided with an actuator rod 15e connected to the operating end. Further, an interlock rod 15g that protrudes and retracts on the floor of the circuit breaker chamber 4 is connected to an intermediate position of the main operation shaft 15 via a crank arm 15e and a link 15f, and the interlock rod 15b is connected to the main operation shaft. In response to the opening and closing operation of the circuit breaker 15, the circuit breaker 9 penetrates through the base frame 16 that partitions the floor of the circuit breaker room 4.
Appearing on the travel route of.

With this configuration, when the circuit breaker 9 is in the operating position (solid line) in FIG. 5, the interlock rod 15g hits the bottom of the circuit breaker 9 and the main operation shaft 15 cannot be rotated. Ground switch 13
Has been disabled. On the other hand, when the circuit breaker 9 is pulled out to the disconnecting position (broken line), the interlock rod 15g can protrude into the circuit breaker chamber 4 without being interrupted by the circuit breaker. Therefore, in this state, the grounding switch 13 can be turned on by rotating the main operation shaft 15.

[0006]

However, the conventional interlock mechanism for the above-mentioned grounding switch has the following problems in terms of safety in maintenance and inspection work for the cable room. That is, in the switchboard of the conventional structure shown in FIGS. 5 and 6, even when the circuit breaker 9 is in the live position in the operating position, the jacket door 5a of the cable room 5 can be opened by removing the fastening bolt 5b. Is possible. For this reason, without confirming that the main circuit is in a live state, the cable room 5 can be used.
When the maintenance staff enters the panel by opening the outer cover door 5a, there is a risk of touching a charged part in the panel and receiving an electric shock.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to solve the above-mentioned problems and to improve the safety of maintenance and inspection work in a cable room defined in a panel. It is to provide a closed switchboard for electric power.

[0008]

According to the present invention, a control room, a bus room, a circuit breaker room, and a control unit are provided inside a panel housing having a front door constructed of a grounded metal plate. In a closed power distribution panel in which the cable room is partitioned and a grounding switch is incorporated in the cable room, and the operating end of the main operating shaft of the grounding switch is arranged facing the front of the panel, The grounding switch can be opened and closed only when the jacket door is closed between the outer door and the main operation shaft of the grounding switch. Mechanical interlock means for locking the main operation shaft so that it cannot be operated is provided (claim 1).

(2) Between the jacket door arranged in front of the cable room and the main operating shaft of the earthing switch, the jacket door can be opened only when the earthing switch is in a closed state, and the earthing switch can be opened and closed. Mechanical interlock means for locking the jacket door to the closed position in a state where the container is disconnected (claim 2). (3) The interlock means described in (1) and (2) above is provided between the jacket door arranged in front of the cable room and the main operation shaft of the grounding switch.

[0010] As described above, the interlock means described above are additionally provided for the opening / closing operation mechanism of the grounding switch incorporated in the panel, so that even when the circuit breaker is moved to the disconnection position, the cable room can be closed. If the jacket door is not closed,
When the grounding switch cannot be operated from closed (main circuit uncharged) to disconnected (main circuit charging), and the grounding switch is disconnected (during main circuit charging), the outer door of the cable room may be opened. Not.

That is, before opening the outer cover of the cable room during maintenance and inspection of the panel, the circuit breaker is moved from the operating position to the disconnecting position, and the grounding switch is not turned on to the closed position before opening the cable room. As long as the jacket door cannot be opened. Also,
After the maintenance work is completed, the power supply to the load cannot be restarted by operating the grounding switch to the disconnection position unless the outer door of the cable room is closed. From this, when the jacket door of the cable room is open, the grounding switch is always turned on and the main circuit in the cable room is not charged, which allows maintenance and inspection work to be performed in the cable room. Safety against electric shock accidents can be ensured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. In addition,
In the drawings of the embodiment, the same members corresponding to FIGS. 5 to 7 are denoted by the same reference numerals. That is, in this embodiment, in addition to the interlock means (interlock rod 15g) of the circuit breaker 9 described in FIG. As shown in FIG. 4, a first interlock mechanism 17 according to claim 1 of the present invention and a second interlock mechanism 18 according to claim 2 of the present invention are additionally provided.

Here, the first interlock mechanism 17
Has one end pivotally supported in a cantilever manner on the lower surface of the circuit breaker base frame 16 via a pin 17a, and the distal end side is the main operating shaft 1
6 and a guide roller 17c pivotally supported at the lower end of the interlock piece 17b (this guide roller is located outside the cable chamber as described later). When the door is closed, it is placed on the interlock piece protruding behind the door). The upper end of the interlock piece 17b projects in an L-shape toward a coupling pin 15a provided at the end of the main operation shaft 15, and the tip of the interlocking piece 17b has the grounding switch 13 turned on. A concave groove 17d that engages with the coupling pin 15a of the operation shaft 15 is formed.

On the other hand, the second interlock mechanism 18
Crank arm 18a coupled on the axis of main operation shaft 15
A joint 18c pivotally connected to the crank arm 18a via a pin 18b; an L-shaped lever 18d having a rear end screwed into the joint 18c; and an interlock rod 18e ( This interlock rod protrudes and retracts toward the interlock piece that protrudes backward from the jacket door of the cable room as described later.)
And an interlock rod 18e is fixed to a lower portion of the front surface of the circuit breaker base frame 16 by a guide 18f.
Is guided and supported so as to be able to protrude and descend downward.

Next, the operation of the first and second interlock mechanisms will be described with reference to FIGS. 1 (a) to 1 (d). In addition,
In the figure, a tongue-shaped interlock piece 5c is provided at the upper end of the jacket door 5a of the cable chamber 5 so as to face the guide roller 17c and the interlock rod 18e of the interlock mechanism and project toward the indoor side. As shown in FIG. 1 (d), a notched groove 5d engaging with the interlock rod 18e is formed in the plate surface of the interlock piece 5c.

First, FIG. 1A shows an outer cover 5 of a cable room 5.
a is closed and the grounding switch 13 (see FIG. 5) is closed. In this state, the guide roller 17c rides on the interlock piece 5c protruding from the jacket door 5 into the cable room, and the interlock piece 17b of the first interlock mechanism 17 is lifted up so as to separate from the main operation shaft 15. It is pushing up. In addition, the main operation shaft 15 of the grounding switch rotates to the closing position and pulls the interlock rod 18e of the second interlock mechanism 18 upward. Therefore, in this state, the interlock piece 5c of the jacket door 5a is unlocked and the door can be opened freely. In the illustrated state in which the jacket door 5a is closed, the interlock piece 17b of the first interlock mechanism 17 is separated from the main operation shaft 15 and retreated upward with respect to the main operation shaft 15. Thus, the operation handle inserted through the operation window 16 on the front of the panel can be coupled to the coupling pin 15a of the main operation shaft 15 to rotate the grounding switch 13 to the disconnection position.

Next, FIG. 1B shows a state in which the jacket door 5a of the cable room 5 is opened from FIG. 1A. In this state, the interlock piece 1 of the first interlock mechanism 17
7b leans on the main operation shaft 15 by its own weight, and a concave groove 17d formed at the tip thereof is fitted into the coupling pin 15a of the main operation shaft 15. Therefore, in this state, even if the operation handle is inserted through the operation window 16a, the interlock piece 17b hinders the operation handle from being coupled to the coupling pin 15a, thereby opening and closing the ground when the cover door 5a is open. The rotating device 13 cannot be rotated to the disconnection position.

FIG. 1 (c) shows the state of FIG. 1 (a) in which the jacket door 5a is closed, and the operation handle inserted through the operation window 16 is connected to the main operation shaft 15 and rotated in the direction of arrow P. This shows a state where the grounding switch is disconnected. In this state, the interlock rod 18e of the second interlock mechanism 18 protrudes downward following the rotation of the main operation shaft 15, and the outer door 5
a engages with the concave groove 5d of the interlock piece 5c.
Therefore, in this state, the jacket door 5a of the cable room 5 cannot be opened.

[0019]

As described above, according to the present invention,
The interlock mechanism according to claims 1 and 2 is additionally provided between an opening / closing operation mechanism of a grounding switch incorporated in a cable room of a switchboard and a jacket door disposed in front of the cable room, thereby maintaining the inside of the panel. At the time of inspection, the outer door of the cable room cannot be opened unless the grounding switch is operated from the disconnection (main circuit charging) to the closing (main circuit no charging) position. In addition, after the cover door is opened and maintenance and inspection work inside the panel is completed, the grounding switch cannot be operated to the disconnection (main circuit charging) position unless the cover door is closed. In addition, the maintenance work in the cable room can be performed safely without the danger of electric shock.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an interlock operation according to an embodiment of the present invention, in which (a) shows a state where a jacket door of a cable room is closed and a grounding switch is turned on, and (b) is a view showing (a) Figure showing the state where the jacket door of the cable room is opened from the figure, (c) figure showing the state where the earthing switch is operated to the disconnection position after closing the jacket door of the cable room, (d) ) Is a plan view of the interlock piece of the jacket door in Fig. (C).

FIG. 2 is a side view showing a detailed structure of first and second interlock mechanisms in FIG. 1;

FIG. 3 is a partially cutaway plan view showing a detailed structure of first and second interlock mechanisms in FIG. 1;

FIG. 4 is a sectional view taken along line XX in FIG. 2;

FIG. 5 is a diagram showing the internal structure of a closed power distribution panel to which the present invention is applied;

FIG. 6 is a front view of the switchboard shown in FIG. 5;

7 is a detailed structural view of a main operation shaft of a grounding switch incorporated in the switchboard of FIG. 5, (a) is a side view of the entire main operation shaft,
(b) Enlarged view of the interlock mechanism of the circuit breaker provided on the main operation shaft

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switchboard cabinet 2 Control room 3 Bus room 4 Breaker room 5 Cable room 5a Cable room outer door 5c Interlock piece 5d Engagement groove 9 Breaker 10 Cable 13 Ground switch 15 Main operation of ground switch Shaft 15a Coupling pin 15g Interlock rod of circuit breaker 16 Base frame of circuit breaker 16a Operation window of grounding switch 17 First interlock mechanism 17b Interlock piece 17c Guide roller 17d Groove 18 Second interlock mechanism 18e Interlock rod

Claims (3)

[Claims] 1. A control room, a bus room, a breaker room, and a cable room are defined inside a panel housing with a front door constructed of a grounded metal plate, and a grounding switch is incorporated in the cable room. In a closed power distribution panel in which an operation end of a main operation shaft of the grounding switch faces a front surface of the panel, an outer cover is provided between a jacket door disposed in front of a cable room and a main operation shaft of the grounding switch. A mechanical interlock means that enables the opening and closing operation of the ground switch only when the door is closed, and locks the main operating shaft of the ground switch so that it cannot be disconnected when the outer door is open A closed switchboard for electric power, comprising: 2. A control room, a bus room, a breaker room, and a cable room are partitioned inside a panel housing having a front door constructed of a grounded metal plate, and a grounding switch is built in the cable room. In a closed power distribution panel with the operating end of the main operation shaft of the switch facing the front of the panel, a grounding switch is located between the jacket door arranged in front of the cable room and the main operation shaft of the grounding switch. A power interlock means for opening the cover door only when the switch is in the closed state, and mechanical interlock means for locking the cover door to the closed position in a state where the grounding switch is disconnected. Closed switchboard. 3. A control room, a busbar room, a circuit breaker room, and a cable room are partitioned in a panel housing having a front door constructed of a grounded metal plate, and a grounding switch is incorporated in the cable room. 2. A closed power distribution panel for electric power, wherein an operation end of a main operation shaft of a switch is arranged to face a front surface of the panel, between a jacket door arranged on a front surface of a cable room and a main operation shaft of a grounding switch. A closed switchboard for electric power, comprising the interlock means of claim 1 and the interlock means of claim 2.