JPH1094194A - Power supply device for inspecting distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the effects on a load at the time of inspection of a distribution board as small as possible and lessen additional jobs before and after the inspection of the distribution board by installing a power receiving means used at the time of inspection which receives power from a first bus bar through a fourth breaker or from a third bus bar through a fifth breaker and an output breaker used at the time of inspection. SOLUTION: A power supply device is so structured that a breaker (a fourth breaker) 15 of a bus bar (a first bus bar) 11 of an A-distribution board 10 or a breaker (a fifth breaker) 32 of a bus bar 31, of a C-distribution board 30 can be connected to a bus bar 41 of a power supply 40 for inspection through a temporary cable 51. The bus bar 41, being provided with an output breaker 42, can be connected to a load 29 through a temporary cable 52, and a breaker 25 and an electromagnetic switch 23 in a B-distribution board 20. Due to this structure, the A-distribution board 10 and the B-distribution board can be inspected with the supply of power to only a B-bus bar 21 being cut or the supply of power to both the A-bus bar 11 and the B-bus bar 21 being cut, while the load is being operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a power plant, a substation,
It relates to switchboard equipment in factory facilities.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional power supply system in a power plant. FIG. 4 shows a typical power supply system configuration in a power plant, in which a high-capacity A switchboard 10 connected to an A bus 11 having a large bus capacity and a B switchboard having a small bus capacity.
1 shows a lower small-capacity B switchboard 20 connected to a bus 21. A bus breakers 12 and 13 are connected to an A bus 11 in the A switchboard 10. An A bus load 19 installed outside the switchboard is connected to the circuit breaker 12.
The B bus 21 of the B switchboard 20 is connected to the circuit breaker 13. In the B switchboard 20, a plurality of B bus breakers 22, 22, ... are connected to the B bus 21. There are various system configurations. In the illustrated example, a load 29 is directly connected to the first circuit breaker 22, and the second and third circuit breakers 2 are connected.
A load 29 is connected to 2 via an electromagnetic switch 23, and a load 29 is connected to the last circuit breaker 22 via a forward electromagnetic switch 23 or a reverse electromagnetic switch 23.

[0003]

Switchboards are generally regularly inspected. At the time of this inspection, since the power is cut off simultaneously in the switchboard, inspection of each of the loads 19 and 29 is often performed at the same time. However, even when the power plant is stopped,
In some cases, it may be desirable to operate the loads 19 and 29 continuously.
Without a simultaneous power outage, a power outage / inspection is performed for each switchboard, and the loads 19 and 29 are sequentially inspected accordingly.

[0004] In general, the inspection schedule of the switchboard and the inspection schedule of the load do not mesh well with each other.
9, 29 will be temporarily supplied with power from another switchboard bus. In such a power supply mode, the distribution board on the power supply side and the load on the power supply side are connected by a cable temporarily provided. In that case, it is necessary to arrange cables and wiring work before the inspection of the switchboard, and it is necessary to remove the cables after the inspection of the switchboard.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply for inspecting a switchboard which can reduce additional work before and after the switchboard check as much as possible while avoiding an adverse effect on a load as much as possible.

[0006]

To achieve the above object, the present invention according to claim 1 is a first bus breaker of a first switchboard including a first bus and a first bus breaker. To the second bus of the second switchboard including the second bus and the second bus breaker, and from the second bus via the second bus breaker to the outside of the second switchboard. In a power supply unit for inspecting a switchboard used in a power supply system for supplying power to a load disposed in a power supply system, a first bus bar is connected via a fourth circuit breaker.
A power receiving means for receiving power from the third bus via the fifth circuit breaker; and a first bus breaker and a second bus cutoff for inspecting at least the second bus with the power received by the power receiving means. And an output circuit breaker for supplying the load to the load in a state where the circuit breaker is shut off.

According to a second aspect of the present invention, in the power supply unit for inspecting a switchboard according to the first aspect, the power receiving means and the output circuit breaker are fixedly configured as a power supply unit for inspection. It is.

According to a third aspect of the present invention, in the power supply device for inspecting a switchboard according to the first aspect, the power receiving means and the output circuit breaker are movably configured as a power supply device for inspection. It is.

According to a fourth aspect of the present invention, in the power supply device for inspecting a switchboard according to the second or third aspect, a synchronization test between the voltage of the first bus and the voltage received by the power receiving means is performed, and both voltages are checked. Power supply to the load when the
A switching means for switching from the bus voltage to the receiving voltage of the power receiving means is provided in the power supply for inspection.

According to a fifth aspect of the present invention, in the power supply device for inspecting a switchboard according to the fourth aspect, the switching means is constituted by a thyristor switch.

According to a sixth aspect of the present invention, in the power supply device for inspecting a switchboard according to any one of the first to fifth aspects,
An inspection circuit breaker for supplying power from an output circuit breaker to a load is provided in the second switchboard.

According to a seventh aspect of the present invention, in the power supply device for a distribution board inspection according to the sixth aspect, the inspection circuit breaker is configured as a plug-in circuit breaker.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention. The A bus 11 of the upper A switchboard 10 has A
The bus breakers 13 and 15 are connected. Circuit breaker 1
The load side of No. 3 is connected to the B bus 21 of the lower B switchboard 20. The B bus 21 is connected to a load 29 via a B bus breaker 22 and an electromagnetic switch 23. Switchboard 2
At 0, an inspection circuit breaker 25 is provided to supply power to the power supply side of the electromagnetic switch 23 from another switchboard. On the other hand, A
The C bus 31 of the C switchboard 30 different from the switchboard 10 is configured to be connected to the inspection bus 41 of the inspection power supply 40 via the C bus breaker 32 and the temporary cable 51. The bus 41 is first supplied with power from the A bus circuit breaker 15 via the cable 51 and supplies power to a plurality of output circuit breakers 42 in the inspection device provided as necessary. The load side of the circuit breaker 42 is connected to the temporary cable 52 and the switchboard 20.
It is connected to the power supply side of the electromagnetic switch 23 via the circuit breaker 25 inside.

When the switchboard is not checked, the load 2 is always
9 is an A bus 11 to an A bus circuit breaker 13, a B bus 21,
Power is supplied via a B bus circuit breaker 22 and an electromagnetic switch 23. At this time, the A bus breaker 15 and the C bus breaker 3
2. The output circuit breaker 42 and the inspection circuit breaker 25 are all open.

If the B bus 21 included in the switchboard 20 is to be inspected while the operation of the load 29 is continued, the A bus breaker 13 and the B bus breaker 22 are opened, and the A bus breaker 15 The circuit breaker 42 and the inspection circuit breaker 25 are closed. As a result, power is supplied to the load 29 from the A bus 11 through the A bus circuit breaker 15, the cable 51, the inspection bus 41, the output circuit breaker 42, the inspection cable 52, the inspection circuit breaker 25, and the electromagnetic switch 23. can do. In this way, the inspection of the B bus 21 can be performed in a power outage state while the operation of the load 29 is continued.

At the time of recovery, the circuit breaker 13 is closed and the A bus 1
After confirming that power has been received from the first and B buses, the output circuit breakers 42 and 25 are opened, and then the B bus circuit breaker 2 is opened.
By closing 2, power can be supplied to the load 29.

The above is an example of a case where the A bus 11 is put into a live state, the power is received from the A bus 11, the load 29 is operated, and the B bus 21, that is, the switchboard 20 is inspected. A bus 1
An embodiment in the case where the 1 and B buses 21 are simultaneously powered down for inspection will be described below. In this case, the cable 5 connecting between the A bus breaker 15 and the inspection bus 41 is used.
1 is changed so as to connect between the C bus breaker 32 and the inspection bus 41, and the C bus breaker 32, the output circuit breaker 42, and the inspection breaker 25 are closed. Thus, power can be supplied to the load 29 from the C bus 31 via the C bus breaker 32, the cable 51, the inspection bus 41, the output circuit breaker 42, the inspection cable 52, the circuit breaker 25, and the electromagnetic switch 23. it can. Also in this case, the inspection of the B bus 21 can be performed in a power outage state while the operation of the load 29 is continued.

At the time of restoration in this case, the circuit breaker 13 is closed, and after confirming that the A bus 11 and the B bus have received power, the circuit breakers 32, 42, and 25 are opened, and then the B bus is cut off. The power supply to the load 29 can be continued by closing the switch 22.

Normally, the load 29 is opened and closed by the electromagnetic switch 23. However, if the electromagnetic switch 23 is not provided and the load 29 is normally opened and closed directly by the B bus breaker 22, The operation can be substituted by the check circuit breaker 25.

Further, by using a break-in circuit breaker as shown in the figure as the check circuit breaker 25, the check circuit breaker 25 can be removed when power is supplied from the B bus circuit breaker 22 to the load 29. Thus, the inspection circuit breaker 25 can be inspected.

Further, the power supply for inspection 40 may be provided in a fixed manner, or may be provided in a movable manner. In the case of a mobile type, the length of the temporary cables 51 and 52 can be shortened by installing the power supply device 40 near the B bus 21, thereby reducing the amount of work for cable construction. it can.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention. In this embodiment, the load 2
Reference numeral 9 is suitable when no instantaneous power failure is allowed.
The illustrated inspection power supply device 40 is a power receiving circuit breaker 4 in the inspection device.
3, 44, switching switch 45, output circuit breaker 42 in inspection equipment
And a synchronization device 46. Switching switch 4
5 is a power receiving circuit breaker 43 and a cable 5
3 and connected to the load side of the C busbar breaker 32,
Are connected to the load side of the A bus breaker 15 via the power receiving circuit breaker 44 and the cable 51, and the movable contacts are connected to the power supply side of the output circuit breaker 42. It shall be possible to assume a neutral position without contact. The synchronizer 46 controls the voltage guided to one of the two fixed contacts of the switching switch 45, that is, the A bus 1
1 and the voltage of the B bus 21 and the voltage of the B bus 21 guided through the circuit breakers 42 and 25 guided to the movable contacts, and a synchronization test is performed. The switching operation of the container 45 is performed.

In the apparatus shown in FIG. 2, the power supply 40 can receive power from the A bus 11 or the C bus 31 via the circuit breakers 15 and 44 or the circuit breakers 32 and 43.

When checking the B bus 21 with the power supply 40 receiving power from the A bus 11, the circuit breaker 4 is in a state where the switching switch 45 is in the neutral position.
2 and 25 are closed, a synchronization test is performed between the voltage of the circuit breaker 42 and the voltage of the circuit breaker 44 by the synchronizer 46, and the switching switch 45 receives the voltage of the A bus 11 in a synchronized state. To the power receiving circuit breaker 44 side. Thereby, the load 29 is in a state of receiving power from the two systems of the B bus 21 and the power supply device 40. Thereafter, the B bus breaker 22
By opening the A bus circuit breaker 13 and disconnecting the B bus 21 from the system while continuing the uninterruptible power supply from the A bus 11 to the load 29 via the power supply 40,
Inspection of the bus 21 can be made possible.

Next, when it is desired to inspect the A bus 11 and the B bus 21 at the same time, the power supply unit 40 supplies the B bus 21 and the C bus 3 via the circuit breakers 25 and 42 and the circuit breakers 32 and 43.
In the state where power is supplied from the power supply 1, the synchronization of the voltage of the two buses 21 and 31 is performed by the synchronizer 46, and the switching switch 45 receives the voltage of the C bus 31 in the synchronized state. A switching operation to the circuit breaker 43 is performed. Thereby, the load 29 is in a state of receiving power from the two systems of the B bus 21 and the power supply device 40. Thereafter, by opening the upper breaker (not shown) of the A bus 11 and the B bus breaker 22, the A bus 11 and the B bus 21 are disconnected from the system while continuously supplying power to the load 29 without interruption. Separation and inspection of both buses 11 and 21 can be performed.

(Embodiment 3) FIG. 3 shows a third embodiment of the present invention. This embodiment is suitable for a case where an instantaneous power failure of the load 29 is not allowed, as in the case of FIG. The inspection power supply device 40 shown in FIG.
Thyristor switches 45A and 45B are provided in place of the switching switch 45 of FIG.
2 is divided into two, and one output circuit breaker 42A is connected in series to the thyristor switch 45A, and the other output circuit breaker 42B is connected in series to the thyristor switch 45B. The synchronizer 46 includes a load side of the circuit breaker 15, a load side of the thyristor switch 45B, and the output circuit breaker 42.
Each voltage on the load side of A and 42B is led. Others are in Figure 2
There is no difference from the one.

In this embodiment, in order to disconnect the B bus 21 from the system for inspection, the load 29
When the power supply to the power supply is switched from the A bus 11 to the C bus 31, the thyristor switches 45A and 45B can be switched on / off instantaneously without power interruption, and the flexibility of power supply to the load 29 can be improved. it can.

[0028]

According to the present invention, it is not necessary to adjust a power outage schedule and a load inspection schedule by inspecting a switchboard, and power can be easily supplied to a load required to be operated in a short time. it can. Since the work with the temporary power supply has been performed since the end of the service life, the work becomes unnecessary, and the cost can be reduced by shortening the power outage time and short-term inspection.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing a first embodiment of a power supply unit for inspecting a switchboard according to the present invention.

FIG. 2 is a connection diagram showing Embodiment 2 of a power supply unit for inspecting a switchboard according to the present invention.

FIG. 3 is a connection diagram showing a third embodiment of a power supply unit for inspecting a switchboard according to the present invention.

FIG. 4 is a connection diagram showing a configuration example of a conventional power supply device for inspecting a switchboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 A switchboard 11 A bus 13, 15 A bus breaker 20 B switchboard 21 B bus 22 B bus breaker 23 Electromagnetic switch 25 Inspection breaker 29 Load 30 C switchboard 31 C bus 32 C bus breaker 40 Inspection power supply Device 41 Bus for inspection 42, 42A, 42B Output circuit breaker 43, 44 Power receiving circuit breaker in inspection device 45 Switching switch 45A, 45B Thyristor switch 46 Synchronizing device 51, 52 Temporary cable

Claims (7)

[Claims] 1. A first switchboard of a first switchboard including a first busbar and a first busbar breaker and a second switchboard of a second switchboard including a second busbar and a second busbar breaker. A power supply system used in a power supply system that receives power to the second bus and supplies power from the second bus to a load disposed outside the second switchboard via the second bus breaker. From the first bus via a fourth circuit breaker, or a third
Power receiving means for receiving power from the bus through a fifth circuit breaker, and the first bus circuit breaker and the second bus interrupt for at least inspection of the second bus with the power received by the power receiving means A power supply for inspecting a switchboard, comprising: an output circuit breaker that supplies the load to the load in a state where the switch is cut off. 2. The power supply device for inspecting a switchboard according to claim 1, wherein said power receiving means and said output circuit breaker are fixedly configured as power supply devices for inspection. 3. The power supply device for inspecting a switchboard according to claim 1, wherein said power receiving means and said output circuit breaker are movably configured as a power supply device for inspection. 4. The power supply for inspecting a switchboard according to claim 2, wherein a synchronization test is performed between the voltage of the first bus and the voltage received by the power receiving means, and the two voltages are synchronized. A power supply device for inspecting a switchboard, wherein a switching unit for sometimes switching power supply to the load from the first bus voltage to a receiving voltage of the power receiving unit is provided in the power supply unit for inspection. 5. A power supply device for inspecting a switchboard according to claim 4, wherein said switching means comprises a thyristor switch. 6. The power supply unit for inspecting a switchboard according to claim 1, further comprising a circuit breaker for inspection for supplying power from said output circuit breaker to said load in said second switchboard. A power supply device for inspecting a switchboard. 7. The power supply for inspecting a switchboard according to claim 6, wherein the circuit breaker for inspection is configured as a plug-in type circuit breaker.