JPS6249805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power distribution board that allows only the main circuit of a drawer-type electric device to be operated while housed in a power distribution box.

In general, a power distribution board such as a control center or a closed power distribution board allows drawer-type electrical equipment such as circuit breakers to be inserted into and out of the power distribution box. The distribution box has a configuration in which a busbar room and an electrical room are formed through partition walls provided inside.
Both ends of the primary disconnection section provided on the partition wall are exposed to the busbar room and the electrical room. The busbar room houses a power supply busbar and a load busbar connected to the end of the primary disconnecting section. The end of the primary disconnector on the electrical room side comes into contact with and separates from the primary contact of the circuit breaker that enters and exits the electrical room through the entrance. A secondary disconnection fixing plug, an auxiliary fixing plug, and positioning fittings are attached to the ceiling and floor of the electrical room. The secondary disconnecting section fixing plug and the auxiliary fixing plug are a first fixing plug and a first auxiliary fixing plug, a second fixing plug and a second auxiliary fixing plug, which are formed sequentially from the primary disconnect section side toward the entrance/exit side. , is composed of. The position fitting sequentially forms an operating position groove and a test position groove from the primary disconnection part side toward the entrance/exit side, and the space between the test position groove and the entrance/exit is generally referred to as the disconnection position. The disconnection position may be installed outside the distribution box and the disconnection test may be performed. Moreover, each position groove may form a hole directly in the floor surface.
A secondary movable plug is attached to the ceiling of the circuit breaker, which electrically opens and closes the 2 o'clock disconnect section fixed plug and the auxiliary fixed plug. Furthermore, the operating rods provided on the front side of the circuit breaker are inserted into the respective position grooves to prevent the circuit breaker from returning to the entrance/exit side, and are removed from the respective position grooves to move the circuit breaker.

When the circuit breaker reaches the operating position groove, the operating rod is inserted into the operating position groove, and the primary contact is inserted into the primary disconnecting section. In this state, when a closing command is issued from the remote central control unit, the secondary movable plug and the
The fixed plug and the first auxiliary fixed plug form an electric circuit, and the fixed electrode and the movable electrode connected to the main circuit of the circuit breaker, such as the primary contact, are closed. The auxiliary fixed plug opens and closes according to the opening and closing of the main circuit.
For example, if the central control unit issues a turn-on (shut-off) command and the site does not know that the main circuit is closed (open), there is a risk that it will be turned on again at the site. To prevent this, close (open) the auxiliary fixing plug.
The indicator light lights up in red (green) depending on the situation. Alternatively, it serves to send signals from the auxiliary fixed plug to other closed switchboards.

When the circuit breaker moves to the entrance/exit side and reaches the test position groove, the primary disconnecting part and the primary contact are separated and the second
Test whether the fixed plug and the second auxiliary fixed plug are closed and the main circuit of the circuit breaker is opened/closed. Furthermore, when the circuit breaker moves toward the entrance/exit side and comes to the disconnection position, the secondary disconnection part fixing plug and the auxiliary fixation plug are not in contact with each other, resulting in a disconnection state.

By the way, closed distribution boards housing circuit breakers that operate as described above in respective position grooves provided in the distribution box are arranged in units of several tens to several hundred units in power plants, substations, and the like. Check that the closed switchboard is in accordance with the specifications, for example, whether the number of units and the capacity of the disconnector are as per the specifications.
If there are no problems, the installation work will be completed. Then, if the circuit breaker can perform each of the above-mentioned tests at each location groove in the distribution box, the inspection is completed and the closed distribution board is handed over to the customer. One of the tests a customer performs to check the performance of a closed switchboard is a so-called circuit breaker operation test, in which the circuit breaker is pulled out from inside the switchboard and tested to see if the main circuit of the circuit breaker opens or closes.

However, since the circuit breaker operation test is performed by pulling the circuit breaker out from inside the distribution box, the operation is troublesome. For example, in a two-tier closed switchboard, which is one of the multi-tier closed switchboards, the lifter is raised to the entrance of the second-tier electrical room, the circuit breaker is moved from the electrical room to the lifter, and the lifter is lowered to the ground. After moving to the floor, conduct a circuit breaker operation test. Place the circuit breaker on the lifter again, raise it, and
The circuit breaker is stored in the electrical room of the tier. As described above, the circuit breaker operation test work was not only troublesome due to the large number of operation steps, but also had poor work efficiency.

An object of the present invention is to provide a power distribution board that improves work efficiency by reducing the number of operation steps in a circuit breaker operation test.

The present invention provides a circuit breaker operation position groove between the test position groove and the entrance/exit in the distribution box, and when the circuit breaker moves to the circuit breaker operation position groove, it comes into contact with the secondary movable plug of the circuit breaker. If the third fixed plug is installed in the position where the circuit breaker operation test is performed inside the distribution box,
The circuit breaker operation test work can be shortened and work efficiency can be significantly improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a two-tier closed switchboard 1 shown in FIGS. 1 to 3.

The distribution box 2 forms a busbar room 4 and an electrical room 5 via a partition wall 3 provided inside. The busbar room 4 has a partition plate 6
The load bus 7 and the power supply bus 8 are supported by the support insulator 9 via the support insulator 9, and the load bus 7 is connected to the current transformer 9A. Ends of the load bus 7 and the power supply bus 8 are connected to a primary disconnection section 10 supported by the partition wall 3 . The electrical room 5 is provided with a floor plate 11 in the middle to form a second floor room having an upper and a lower electrical room.

The electrical room 5 has a door 13 at one end that opens and closes the entrance 12.
Install. When the door 13 is opened, the primary disconnection section 10, the secondary disconnection section fixing plug 14, and the positioning metal fittings 15 are attached to the partition wall 3, ceiling surface 2A, and floorboard 11 inside the electrical room. The positioning fittings 15 are sequentially inserted into the operating position grooves 15 from the primary disconnect section side to the entrance/exit side.
A, test position groove 15B, circuit breaker operation position groove 15
C, and a disconnection position groove 15D are formed. 16 and 17 are receiving screws and external path auxiliary switches attached to the partition wall 3 and the ceiling surface 2A.

The circuit breaker 18 moves in and out of the electrical room via a roller 19. A main circuit 20 provided inside the circuit breaker, for example, a fixed contact 20A and a movable contact 20B that opens and closes.
The primary contactor 21 is connected to the primary contactor 21, and the primary contactor 21 is brought into contact with and separated from the primary disconnection section 10. Primary disconnection section 10 and 1
A shutter 2 that moves up and down as the circuit breaker 18 moves in and out of the electrical room is connected to the next contact 21.
2 is attached to the partition wall 3. A rod screw 16A that is screwed into the receiving screw 16 is attached to the back surface 18A of the circuit breaker 18. Front surface 18B of circuit breaker 18 and ceiling surface 18
C includes an operating rod 23 and a secondary movable plug 24.
and attach the lifting rod 25. When the manual handle 26 is raised (lowered), the operating rod 23 moves upward (downward) and is attached to and detached from each of the position grooves 15A to 15D. Secondary movable plug 24 and lifting rod 2
5 is attached to the ceiling surface 18C of the circuit breaker, and the lifting rod 25 moves up and down according to the opening and closing of the main circuit 20.
Open/close external auxiliary switch 17. The secondary movable plug 24 comes into contact with and separates from the secondary disconnecting section fixed plug 14 in accordance with the movement of the circuit breaker 18.

Details of the secondary disconnection section fixing plug 14 will be explained with reference to FIG. 4. An auxiliary fixing plug 29 is integrally attached to the secondary disconnecting section fixing plug 14 via an insulating member 28. The secondary disconnecting section fixing plug 14 is composed of a first fixing plug 14A, a second fixing plug 14B, and a third fixing plug 14C. The auxiliary fixing plug 29 includes a first auxiliary fixing plug 29A and a second auxiliary fixing plug 29B. The first fixed plug 14A, the first auxiliary fixed plug 29A, the second fixed plug 14B, and the second auxiliary fixed plug 29B are connected to the secondary It is attached to the ceiling surface 2B at a position where it comes into contact with the movable plug 24. Third fixed plug 14C
is attached to the ceiling surface 2B at a position where it comes into contact with the secondary movable plug 24 when the circuit breaker 18 is placed in the circuit breaker operating position groove 15C.

Next, the operation when the circuit breaker 18 moves to each position 15A to 15D will be explained.

1 When the circuit breaker 18 moves to the operating position groove 15A and the operating rod 23 is inserted into the operating position groove 15A, the primary contactor 21 and the secondary movable plug 24
contacts the primary disconnecting section 10, the first fixing plug 14A, and the first auxiliary fixing plug 29A. In this state, when the closing switch 41 of the control circuit 40 shown in FIG.
0C is closed, the auxiliary A contact 29AA of the auxiliary fixing plug 29 is closed, and the red signal lamp 42 is turned on to indicate the closed state of the circuit breaker 18.
After that, when the cutoff switch 43 is pressed to close the other cutoff circuit 20D, the auxiliary B contact 29BB
is closed, the green signal light 44 is turned on, and the disconnected state of the circuit breaker 18 is indicated. Then, the operating rod 23 is pulled out from the operating position groove 15A, the circuit breaker 18 is moved toward the entrance/exit, and the circuit breaker 18 is stopped in the test position groove 15B. Test position groove 15B
The secondary movable plug 24 and the second
Fixing plug 14B and second auxiliary fixing plug 2
9B and conduct an opening/closing test of the main circuit 20. Furthermore, the circuit breaker moves toward the entrance/exit.

2. When the circuit breaker 18 moves to the circuit breaker operating position groove 15C, the secondary movable plug 24 contacts the third fixed plug 14C. In this state, if you press the input switch 42 (cutoff switch 43), the main circuit 2
Since 0 is closed (opened), a circuit breaker operation test can be performed. Thereafter, the circuit breaker 18 moves to the disconnection position groove 15D.

Thus, in the present invention, the circuit breaker operating position groove 15C is provided in the distribution box so that when the circuit breaker 18 moves to the circuit breaker operating position groove 15C, the secondary movable plug 24 can come into contact with the third fixed plug 14C. Therefore, the circuit breaker operation test can be performed inside the distribution box. Therefore, during circuit breaker operation test work, there is no need to move the circuit breaker in and out of the distribution box as in the past, and the work process can be significantly shortened, thereby improving the efficiency of circuit breaker operation test work. Not only that, since the circuit breaker operation test can be performed inside the distribution box, there is no need to miss any questions on the circuit breaker operation test.

In this embodiment, the third fixing plug 14C can be formed by extending the second fixing plug 14B, so the structure is simple and easy to manufacture, and the secondary disconnecting part fixing plug and the auxiliary fixing plug can be formed into a planar shape. Therefore, the thickness dimension is thin. Therefore, the height dimension of the closed switchboard is not increased. Furthermore, the secondary disconnection part fixing plug and auxiliary fixing plug have a planar shape, so the cooling area is large.
Good cooling.

In the above-described embodiment, the secondary movable plug, the secondary disconnecting section fixed plug, and the auxiliary fixed plug were installed on the ceiling of the circuit breaker and the distribution box, but it goes without saying that they may be installed on the side or floorboard. Further, the first fixed plug and the second and third fixed plugs are provided integrally, but when the circuit breaker moves to the circuit breaker operation position groove, the third movable plug is placed in the position where the secondary movable plug comes into contact. A fixed plug may be provided independently.

As described above, according to the switchboard of the present invention, the circuit breaker operation test can be performed within the distribution box, so that the efficiency of the circuit breaker operation test can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a two-tiered closed switchboard shown as an embodiment of the present invention, Fig. 2 is a side sectional view of an electrical room showing only one of the electrical rooms shown in Fig. 1, and Fig. 3. 2 is a sectional view taken along the line 2, FIG. 4 is a plan view of the secondary disconnecting section fixing plug having the auxiliary fixing plug used in FIGS. 1 to 3, and FIG. 5 is a control circuit. 2... Distribution box, 10... Primary disconnection section, 12...
Entrance/exit, 14...Secondary disconnection part fixing plug, 14A
...First fixing plug, 14B, 14C...Second and third fixing plug, 15A...Operating position groove, 1
5B... Test position groove, 15C... Circuit breaker operation position groove, 18... Circuit breaker, 21... Primary contact, 24
...Secondary movable plug, 29...Auxiliary fixed plug,
29A, 29B...First and second auxiliary fixing plugs.

Claims (1)

[Claims] 1. A primary disconnection section, a secondary disconnection section fixing plug, and an auxiliary fixing plug provided in a power distribution box having an entrance/exit, and a first and second disconnection section provided in the secondary disconnection section fixing plug and the auxiliary fixing plug. 2 fixed plug, first and second auxiliary fixed plugs, and a primary contactor that enters and exits from the above-mentioned entrance into the distribution box and connects and separates from the primary disconnection section, the secondary disconnection section fixed plug, and the auxiliary fixing plug, and 2 and a secondary movable plug, and as the drawer type electrical device is moved from the primary disconnecting section side to the entrance/exit side, the primary disconnecting section and the primary contactor, a first fixed plug, and a first auxiliary fixed plug. and a test position provided at a position in contact with the second fixed and second auxiliary fixed plug between the operating position and the entrance/exit, A switchboard characterized in that an operation position is provided between the test position and the entrance and exit, and has a third fixed plug in contact with the secondary movable plug. 2. An operating position is provided between the test position and the entrance/exit, and a third fixed plug is independently provided at a position where it comes into contact with the secondary movable plug when the drawer-type electrical device is placed at the operating position. A switchboard according to claim 1.