JPS631802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed switchboard housing a drawer-type circuit breaker, and more particularly to a device that automatically measures the insulation resistance of its main circuit in conjunction with the position of the circuit breaker.

Conventionally, in this type of closed switchboard, it is necessary to periodically measure the insulation resistance of the load-side main circuit of each line. Demand for closed switchboards that reduce the burden of this actual measurement work on consumers has increased in recent years. However, since this measurement circuit is directly connected to the main circuit conductor, safety must first be considered, as unless the measurement is carried out with the main circuit completely open, it will be a dangerous operation that could endanger human life. A closed switchboard is required.

1 to 4 are explanatory diagrams showing a closed switchboard equipped with a conventional automatic insulation resistance measuring device.

In Figures 1 and 2, switchboard frame 1
A circuit breaker 14 is housed inside 2. A primary disconnection section 18 is provided on the side opposite to the front door 16 of this circuit breaker 14.
is provided. The upper part of this primary disconnection section 18 is connected to the power supply side conductor 20, and the lower part is connected to the load side conductor 20.
Connected to 2.

An L-shaped rod 24 is attached to the side of the circuit breaker 14, and this rod 24 is attached to the frame seat 26.
A compression coil spring 28 is attached. Further, an insulating plate 30 is attached to the tip of the rod 24, and a contact conductor 32 is fixed to the insulating plate 30, and an insulated wire 34 is connected to the contact conductor 32 via a wire support 36. Further, the insulating plate 30 passes through the guide bolt 38. A push button switch 40 and a stopper bolt 42 are attached near this guide bolt 38. Note that FIGS. 1 and 2 show a state in which the primary disconnection section 18 is open,
3 and 4 show the state in which the primary disconnection section 18 is closed.

Since the conventional automatic insulation resistance measuring device has the above-mentioned structure, it has the following drawbacks. That is, since the push button switch 40 is installed near the conductor where the power supply side conductor 20 and the load side conductor 22 are arranged, there is a drawback that maintenance, inspection and replacement work of the push button switch 40 is difficult. Furthermore, the conductive material has a main bus bar arranged thereon, and even when the circuit breaker 14 is in an open state, voltage may be applied to the main bus bar and the power supply side conductor 20, so there is a drawback that it is highly dangerous. In addition, the position status of the circuit breaker 14 is only displayed outside the panel by an indicator light via the push button switch 40, but if the light bulb used for the indicator light breaks, the circuit breaker 14 can be shut off from outside the panel. Vessel 1
It becomes unclear whether the position state No. 4 is in the operating or disconnected position, which has the disadvantage of increasing the work burden on the customer.

SUMMARY OF THE INVENTION In view of the above drawbacks, an object of the present invention is to provide a closed switchboard that is safe and has excellent workability when measuring insulation resistance.

According to the present invention, it is possible to detect that the circuit breaker is in the disconnected position using a multiple micro switch device connected to the rod, and to display this electrically and mechanically. This is achieved by combining the circuit breaker into a unit system and installing it in the circuit breaker room.

An embodiment of the present invention will be described below with reference to the drawings. However, similar or identical components to those in FIGS. 1 to 4 are indicated using the same reference numerals.

The closed switchboard of this embodiment is substantially the same as that of the conventional example. Therefore, the automatic insulation resistance measuring device, which is a feature of this embodiment, will be described in detail. FIGS. 5 and 6 are explanatory diagrams showing an embodiment of a closed switchboard according to the present invention. A rod 46 is attached to the circuit breaker 14 housed in the switchboard frame 12 so as to be parallel to the side surface of the circuit breaker 14 via a push metal fitting 44, and the push metal fitting 44 is guided by a guide bolt 48. . A compression coil spring 28 is attached to this rod 46, and the rod 46 is supported by a metal fitting 52 of an insulation resistance measuring frame 50 and the like. Further, a switch push rod 5 is provided at the end of the insulation resistance measurement frame 50 on the front door 16 side.
A multiple micro switch 56 having 4 is attached.

5 and 6 show the closed switchboard in a closed state, and FIGS. 7 and 8 show the closed switchboard in an open state.

FIG. 9 is a perspective view showing details of the insulation resistance measuring device. A multiple micro switch 56 having a switch push rod 54 and a metal fitting 52 are fixed to the insulation resistance measuring frame 50. Rod 46
is slidably supported by a through hole 58 provided at one end of the insulation resistance measurement frame 50 and a hole 60 provided in the metal fitting 52.
4 is welded. The rod 4 located between this push metal fitting 44 and one end of the insulation resistance measurement frame 50
A compression coil spring 28 is attached to 6. Furthermore, a thread 62 is cut at the tip of the rod 46 to which the insulating plate 30 is attached.

The pusher 44 is provided with a through hole 64 through which a guide bolt 48 fastened to one end of the insulation resistance measurement frame 50 passes. The insulation resistance measuring device configured as described above is attached to the switchboard frame, and the contact conductor 32 fixed to the insulating plate 30 is
The assembly is completed by fixing the insulated wire to the hole 66 with bolts. The multiple microswitch 56 is connected to an indicator light (not shown), and the indicator light is unitized and provided in the insulation breaker chamber.

Next, the operation of this embodiment will be explained. When the circuit breaker 14 is in the operating position, the contact conductor 32 is connected to the load side conductor 22 as the rod 46 protrudes toward the side opposite to the front door 16 by the pusher fitting 44 attached to the circuit breaker 14. It protrudes while maintaining an insulating distance. On the other hand, the switch push rod 54 of the multiple micro switch 56 is moved to the side opposite to the front door 16 by a spring loaded inside, and the multiple micro switch 56 is in an open state, and the indicator lamp is is not lit, and the end of the switch push rod 54 on the front door 16 side does not protrude to the outside. In this state, it is impossible to measure insulation resistance.

When measuring insulation resistance, the circuit breaker 14 is pulled out to the disconnection position in order to open it. Then, the push metal fitting 44 is pressed against the compression coil spring 28.
As a result, the rod 46, the insulating plate 30, and the contact conductor 32 are moved to the primary disconnecting section 18 side, and the contact conductor 32 is brought into close contact with the load-side conductor 22. At the same time, the end of the rod 46 on the front door 16 side pushes the switch push rod 54 of the multiple micro switch 56, opening the multiple built-in micro switches, closing the display circuit, and lighting the indicator light. to clearly indicate that the circuit breaker 14 is in the disconnected position.
Furthermore, at this time, the front door 16 side end of the switch push rod 54 of the multiple micro switch 56 is connected to the front door 16.
The wire jumps out of the panel through the hole provided in the hole, and mechanically indicates that the circuit breaker 14 is in the disconnected position. When the circuit breaker 14 moves to the operating position, the above operation is reversed. The multiple micro switch 56 has a plurality of built-in micro switches and has a spring that holds the switch push rod 54 in a fixed position.When the external force is removed from the switch push rod 54, the switch push rod 54 returns to its original position. At the same time, the plurality of microswitches become open.

According to this embodiment, when the circuit breaker 14 moves and becomes disconnected, the rod 46 moves to close the multiple micro switch 56, turn on the indicator light, and move the switch push rod 54 from the front door 16 to the outside. Since the disconnection state is clearly indicated by the protrusion, the automatic insulation resistance measurement operation can be performed safely and easily, and the workability is improved and the measurement can be carried out in a short time. Furthermore, even if the indicator lamp does not operate, the disconnection state of the circuit breaker can be confirmed by checking the position of the switch push rod 54.
Additionally, the display device is integrated into a unit, which facilitates installation and maintenance. Therefore, the above-mentioned effects improve the reliability of the closed switchboard.

As is clear from the above description, according to the present invention, it is possible to provide a closed switchboard that is safe and has excellent workability when measuring insulation resistance by electrically and mechanically indicating the disconnected state of the circuit breaker. .

[Brief explanation of the drawing]

Figure 1 is a plan view of a closed switchboard equipped with a conventional insulation resistance measuring device, Figure 2 is a side view of Figure 1, and Figure 3 is a side view of Figure 1.
4 is a side view of FIG. 3, FIG. 5 is a plan view of an embodiment of the closed switchboard according to the present invention, and FIG. Fig. 5 is a side view, Fig. 7 is a plan view of Fig. 5 with the disconnection section open, Fig. 8 is a side view of Fig. 7, and Fig. 9 is the automatic insulation resistance measuring device shown in Fig. 5. FIG. 12... Switchboard frame, 14... Circuit breaker, 1
6...Front door, 18...Primary disconnection section, 22...Load side conductor, 32...Contact conductor, 34...Insulated wire, 46...Rod, 50...Insulation resistance measurement frame, 54...Switch push Rod, 56...Multiple micro switch.

Claims (1)

[Claims] 1 A door and a partition board are provided at one end and inside the switchboard frame, a power supply side and load side disconnect section is installed on the partition board, the power supply side and load side conductors are connected to one side of the disconnect section, and a circuit breaker is installed inside the switchboard frame. is inserted, the circuit breaker moves between the operating position where it connects to the other side of the disconnection section and the disconnection position where it does not connect, and when the circuit breaker moves to the disconnection position, the switch operates,
In a device that indicates that a cutoff circuit is in a disconnected position and also measures insulation resistance by connecting a contact conductor to a load-side conductor, a frame is attached to the inner surface of the switchboard frame, and a guide means is formed on the frame and the partition plate. , supporting Rods in this guide,
Attach an insulating plate to one end of the rod, attach a contact conductor to the insulating plate, attach a switch corresponding to the other end of the rod to the frame, attach a metal fitting to the circuit breaker, insert this metal fitting into the rod, and connect the metal fitting to the partition plate. A spring is inserted between the rods that stores compressive energy when the circuit breaker is in the operating position and releases the compressive energy when the circuit breaker moves to the disconnected position. Then, the rod moves, the contact conductor connects with the load conductor, and the switch is operated.
A closed switchboard characterized by electrically and mechanically indicating that the circuit breaker is in the disconnected position.