JPH11318008A - Control center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch a power supply which drives a load easily. SOLUTION: A temporary disconnector 28 connected to a temporary power supply 36 and a power supply switching device 29 are provided in a unit 21 with a main circuit 34. The movable conductor 49 of the power supply switching device 29 is connected to the primary side of an electromagnetic contactor 25. When a load 33 is driven by an ordinary power supply connected to a bus- bar 30 as an ordinary case, the movable conductor 49 is transferred to a left side and connected to a 1st terminal 41. When the ordinary power supply is cut off at the inspecting of a plant, etc., in order to drive the load 33, the movable conductor 49 is transferred to the right side and connected to a 2nd terminal 42. As a result of this, the load 33 can be driven by the temporary power supply 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control center for switching a power source for driving a load.

[0002]

FIG. 9 shows a conventional single-line diagram when a load is operated via a control center. In FIG. 9, a main circuit device such as a power supply-side disconnector 2, a wiring breaker 3, an electromagnetic contactor 4, a thermal relay 5, and a load-side disconnector 6 is disposed in a unit 1 in the control center. The main circuit 7 is constituted by these components. Power supply disconnector 2 is busbar 8
The load-side disconnector 6 is connected to a load 11 via a connection terminal 9 of a terminal block and a load cable 10.

In such a configuration, the load 11 cannot be operated if the normal power supply on the bus 8 side is stopped during a plant inspection or the like. However,
Even when the normal power supply on the bus 8 side is stopped, there may be a load 11 that needs to be operated.

In such a case, conventionally, as shown in FIG. 10, a temporary terminal block having a connection terminal 12 and a temporary circuit breaker 13 are prepared. And the load cable 10
Is temporarily removed from the connection terminal 9 and then connected to the connection terminal 12 of the temporary terminal block.
Is connected to the temporary power supply 14. Thus, the load 11 can be operated by the temporary power supply 14.

[0005] However, in the conventional technique described above,
When switching the power supply for operating the load 11 to the temporary power supply 14, it is necessary to temporarily disconnect one end of the load cable 10 from the terminal block 9 and then reconnect it to the connection terminal 12 of the temporary terminal block. Switching work was troublesome. In this case, the switching operation of the load cable 10 needs to be performed for three phases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control center capable of easily switching a power supply for operating a load.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a main power supply which is connected to a normal power supply via a power supply side disconnector and connected to a load via a load side disconnector. A unit equipped with a circuit, a temporary disconnector provided to be connected to a temporary power supply different from the normal power supply to the unit, and a power disconnector provided to the unit, the load being provided to the unit. And a power supply switching device capable of switching between a state in which the power supply is connected to the temporary power supply via the temporary disconnector and a state in which the power supply is connected to the temporary power supply through the temporary disconnector.

In the above configuration, when the load is operated with the normal power supply, the load is connected to the normal power supply via the power supply disconnector by the power supply switching device. When the load is operated with the temporary power supply, the load is switched by the power supply switching device to a state in which the load is connected to the temporary power supply via the temporary disconnecting switch.

The power supply switching device is connected to a terminal block made of an insulating material provided in the unit and to a secondary side of a wiring breaker provided in the terminal block and connected to a power disconnector. A first terminal, a second terminal provided on the terminal block, connected to a temporary disconnector, and a terminal connected to a primary side of an electromagnetic contactor connected to a load-side disconnector. And a movable conductor that can be switched between a state connected to the first terminal and a state connected to the second terminal by the movement. Further, the power supply switching device may be constituted by a switching type electromagnetic contactor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Of these, FIG. 1 shows a single-line diagram, and FIG. 2 shows the arrangement and wiring of instruments in the unit.

In FIG. 1 and FIG.
Reference numeral 1 denotes a unit that is housed in a unit room of a control center (not shown) so that the unit can be taken in and out.
A power supply side disconnector 23, a circuit breaker 24, an electromagnetic contactor 25,
A main circuit device such as a thermal relay 26 and a load-side disconnector 27 are provided, and a temporary disconnector 28 and a power supply switching device 29 are provided.

Among the main circuit devices, the power-side disconnector 23
Is arranged on the back side of the frame 22, and is connected to a bus 30 provided in the control center when the unit 21 is stored in the unit room. Although not shown, each bus 30 is connected to a normal power supply. The circuit breaker 24 for wiring is connected to the power supply side disconnector 23. The electromagnetic contactor 25, the thermal relay 26, and the load-side disconnector 27 are connected in series,
The load-side disconnector 27 is connected to a load 33 composed of a motor via a connection terminal 31 of a terminal block and a load cable 32. Here, the power-side disconnector 23,
The wiring circuit breaker 24, the electromagnetic contactor 25, the thermal relay 26, and the load-side disconnector 27 constitute a main circuit 34 in the unit 21. The temporary disconnector 28 is connected to a temporary power supply 36 via a connection terminal 35 of a terminal block.

Next, regarding the power supply switching device 29,
This will be described with reference to FIGS. Power supply switching device 29
, A terminal block 40 made of an insulating material is provided for three phases as shown in FIG. Since the configuration of the power supply switching device 29 is the same for all three phases, only one phase will be described. 3 and 4 show one phase of the terminal block 40. FIG.

The terminal block 40 has a first terminal 41 at one end.
However, a second terminal 42 is provided at the other end. One end of an electric wire 43 connected to the secondary side of the circuit breaker 24 is connected to the first terminal 41 by a screw 4.
4 and a tightening screw 45 is provided. The second terminal 42 has one end of an electric wire 46 connected to the temporary disconnector 28 connected with a screw 47 and a tightening screw 48.

Then, the movable conductor 49 is placed on the terminal block 40.
Are provided so as to be movable in the left-right direction in FIGS. One end of an electric wire 50 connected to the primary side of the electromagnetic contactor 25 is connected to the movable conductor 49 by a screw 51 constituting a connection portion. In addition, this movable conductor 4
U-shaped cutouts 52a, 52b are formed at both left and right ends of 9 corresponding to the tightening screws 45, 48, respectively.

In the above configuration, the load 33 is connected to the bus 3
In the normal case of operating with the normal power supply via the power supply 0, each movable conductor 49 in the power supply switching device 29 is moved to the first terminal 41 side as shown in FIG.
The movable conductor 49 is connected to the first terminal 41 by tightening the tightening screw 45 in a state where a is fitted to the tightening screw 45. As a result, the main circuit 34 in the unit 21 is formed via the power supply switching device 29, and the load 33 can be operated with the normal power supply. At this time, each movable conductor 49 is separated from the second terminal 42.

On the other hand, when the normal power supply is stopped during a plant inspection or the like and the load 33 is operated by the temporary power supply 36, each movable conductor 49 in the power supply switching device 29 is connected as shown in FIG. By moving to the second terminal 42 side and tightening the tightening screw 48 in a state where the right cutout 52b is fitted to the tightening screw 48,
It is assumed that the movable conductor 49 is connected to the second terminal 42.
As a result, the primary side of the electromagnetic contactor 25 and the temporary disconnecting switch 28 are connected via the movable conductors 49 in the unit 21. And the temporary disconnector 2
By connecting the load 8 to the temporary power supply 36 via the connection terminal 35, the load 33 can be operated by the temporary power supply 36. At this time, each movable conductor 49 is separated from the first terminal 41.

When the load 33 is switched from the temporary power supply 36 to the normal power supply, the movable conductors 49 in the power supply switching device 29 may be returned from the state shown in FIG. 4 to the state shown in FIG.

According to the above-described first embodiment, when the power supply for operating the load 33 is switched from the normal power supply to the temporary power supply 36, the power supply switching device 29 is provided in the unit 21.
Are moved from the first terminal 41 side to the second
It is only necessary to switch so as to connect to the terminal 42, so that the work of switching the power supply can be performed more easily than before.

FIG. 5 shows a second embodiment of the present invention. The second embodiment differs from the first embodiment in the following points. That is, the movable conductor 55 in the power supply switching device 29 is provided with two screws 51 that form a connection portion, and one end of the electric wire 50 is connected to each of the screws 51. Although not shown, each electric wire 50 is connected to the primary side of a corresponding electromagnetic contactor 25, and each electromagnetic contactor 25 is connected to two loads via a thermal relay 26 and a load-side disconnector 27. 33.

In the case of such a configuration, the power supply of the two loads 33 can be switched by one power supply switching device 29 at the same time.

FIG. 6 shows a third embodiment of the present invention. The third embodiment differs from the first embodiment in the following points. That is, the power supply switching device in the unit 21 is constituted by the switching type electromagnetic contactor 57. The switchable electromagnetic contactor 57 includes first and second fixed contacts 58a and 58b and first and second movable contacts 5
9a and 59b. Among them, the first fixed contact 58a is connected to the secondary side of the circuit breaker 24,
Are connected to the temporary disconnecting switch 28. One ends of the first and second movable contacts 59a and 59b are commonly connected and connected to the primary side of the electromagnetic contactor 25.

In this case, with the first movable contact 59a connected to the first fixed contact 58a (the state shown in FIG. 6), the load 33 is operated by a normal power supply, and the second movable contact 59 is operated.
In a state where b is switched to be connected to the second fixed contact 58b, the load 33 is switched to be operated by the temporary power supply 36. According to the third embodiment having such a configuration, the power supply switching operation can be performed more easily.

FIGS. 7 and 8 show a fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment in the following points. That is, the power supply switching device 2
The movable conductor 61 of FIG. 9 has one end rotatably attached to the terminal block 62 by an attachment screw 63. At the other end of the movable conductor 61, notches 64a and 64b are formed at the upper edge and the lower edge in FIG. 7, respectively. Further, the tightening screw 45 on the first terminal 41 side and the tightening screw 48 on the second terminal 42 are shifted downward from the centers of the first and second terminals 41 and 42 in FIG. Is located in the position. One end of an electric wire 50 connected to the primary side of the electromagnetic contactor 25 is connected to the center of the movable conductor 61 by a screw 51.

In the above configuration, when the load 33 is operated with a normal power supply, the movable conductor 61 in the power supply switching device 29 is rotated toward the first terminal 41 as shown in FIG. The movable conductor 61 is connected to the first terminal 41 by tightening the tightening screw 45 with the portion 64b fitted to the tightening screw 45. As a result, the load 33 can be operated with the normal power supply. At this time, the movable conductor 61 is separated from the second terminal 42.

On the other hand, when the load 33 is operated by the temporary power supply 36, the movable conductor 61 in the power supply switching device 29 is operated.
Is rotated to the second terminal 42 side as shown in FIG.
The movable conductor 61 is connected to the second terminal 42 by tightening the tightening screw 48 in a state in which the notch 64a on the opposite side is fitted to the tightening screw 48. As a result, the load 33 can be operated by the temporary power supply 36. At this time, the movable conductor 61 is separated from the first terminal 41.

The present invention is not limited to the above embodiments, but can be modified or expanded as follows. The movable conductor 49 in the power supply switching device 29,
As 61, several types having different thicknesses or sizes are prepared, and the type used is changed according to the difference in the power capacity of the load. Used), it is possible to cope with the difference in load power capacity.

[0028]

As is clear from the above description, according to the present invention, the following effects can be obtained. According to the control center of claims 1, 2, 4, and 5, the power supply switching device provided in the unit can easily switch the power supply between when the load is operated with the normal power supply and when the load is operated with the temporary power supply. Will be able to According to the control center of the third aspect, the switching of the power supply of a plurality of loads can be performed simultaneously by one power supply switching device.

[Brief description of the drawings]

FIG. 1 is a single-line diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing arrangement and wiring of appliances in a unit.

FIG. 3 is a plan view of one phase of a power supply switching device in a state where a movable conductor is connected to a first terminal.

FIG. 4 shows a state in which a movable conductor is connected to a second terminal.
Equivalent figure

FIG. 5 is a view corresponding to FIG. 4, showing a second embodiment of the present invention;

FIG. 6 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 3, showing a fourth embodiment of the present invention;

FIG. 8 is a diagram corresponding to FIG. 4;

FIG. 9 shows a conventional example, and is a single-line diagram when a load is operated with a normal power supply.

FIG. 10 is a single-line diagram when the load is operated by a temporary power supply.

[Explanation of symbols]

21 is a unit, 23 is a power-side disconnector, 24 is a circuit breaker, 25 is an electromagnetic contactor, 27 is a load-side disconnector, 28 is a temporary disconnector, 29 is a power switching device, 30 is a bus, 3
3 is a load, 34 is a main circuit, 36 is a temporary power supply, 40 is a terminal block, 41 is a first terminal, 42 is a second terminal, 49 is a movable conductor, 51 is a screw (connection part), and 55 is a movable conductor. , 57 are switch-type electromagnetic contactors (power switching devices), 58a, 58
b denotes first and second fixed contacts, 59a and 59b denote first and second movable contacts, 61 denotes a movable conductor, and 62 denotes a terminal block.

Claims (5)

[Claims] 1. A unit having a main circuit connected to a normal power supply via a power supply-side disconnector and connected to a load via a load-side disconnector; A temporary disconnector provided so as to be connected to the temporary power supply, and a state provided in the unit, wherein the load is connected to the normal power supply via the power supply-side disconnector, and via the temporary disconnector. A power switching device capable of switching to a state in which the power supply is connected to the temporary power supply. The power supply switching device is connected to a terminal block made of an insulating material provided in the unit, and to a secondary side of a wiring breaker provided in the terminal block and connected to a power disconnector. A first terminal, and a second terminal provided on the terminal block and connected to the temporary disconnector.
And a terminal connected to the primary side of an electromagnetic contactor connected to the load-side disconnector, the terminal block being movably provided on the terminal block, and being connected to the first terminal by the movement thereof. 2. The control center according to claim 1, further comprising: a movable conductor that can be switched to a state of being connected to the terminal. 3. The control center according to claim 2, wherein the movable conductor has a plurality of connecting portions. 4. The control center according to claim 2, wherein the movable conductor is rotatably provided on the terminal block. 5. The control center according to claim 1, wherein the power supply switching device comprises a switching type electromagnetic contactor.