JP2020014296A - Commutation type DC circuit breaker panel - Google Patents

Abstract

To provide a commutation type DC circuit breaker panel that can improve a workability and safety of a maintenance and inspection work and a replacement work.SOLUTION: A main switch driving device is arranged at a lower stage of a DC circuit breaker storage box so as to be movable in a predetermined direction for drawing out from the DC circuit breaker storage box, a commutation capacitor is disposed at the lower position of the DC breaker storage box behind the main switch driving device, and is movably arranged in the same predetermined direction as the main switch driving device, and a connection conductor wired so as to pass in a space between the main switch driving device and the commutation capacitor is provided with a first part that passes through a moving range of the commutation capacitor, a second part that does not pass through the moving range of the commutation capacitor, and a contact for physically and electrically connecting the first and second parts in a separable manner in a commutation type DC circuit breaker panel.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a commutation type DC circuit breaker panel, and is suitably applied to, for example, a commutation type DC circuit breaker panel installed in a substation or the like.

  BACKGROUND ART Conventionally, as a circuit breaker, there is a commutation type DC circuit breaker that interrupts the DC current by superimposing a charge accumulated in a capacitor in a direction opposite to a DC current flowing in a main circuit. This type of commutation type DC circuit breaker is connected between a DC power supply and a load, and has a main switch for electrically opening and closing a main circuit, a commutation capacitor and a commutation switch connected in series, It is provided with a commutation circuit connected in parallel with the main switch, and a control device for controlling on / off of a commutation switch of the commutation circuit.

  When an excessive current flows in the main circuit, the commutation switch is turned on after the main switch is opened, and a high-frequency commutation current accompanying the discharge of the commutation capacitor is supplied to the main switch. Then, the commutation current is superimposed on the DC current of the main circuit, and the DC is cut off by generating a current zero point in the DC current.

  With respect to such a commutation type DC circuit breaker panel, for example, in Patent Document 1, a main switch driving device including a main switch and a commutation switch is arranged at a lower stage inside a housing of a switchboard, and a commutation capacitor is provided. There is disclosed a configuration arranged in an upper stage inside a housing.

JP 2008-220160 A

  By the way, the conventional commutation type DC circuit breaker panel disclosed in Patent Document 1 has a structure in which the heavy commutation capacitor is arranged in the upper part inside the housing of the switchboard as described above. When the commutation capacitor is taken in and out of the housing for maintenance or replacement, it has been necessary to raise and lower the commutation capacitor using a lifter.

  However, there is a problem that work at a high place using a lifter is not only dangerous but also poor in workability. Further, since the heavy objects are arranged in the upper stage as described above, the position of the center of gravity of the switchboard is increased, which has been a factor of reducing the stability of the switchboard.

  The present invention has been made in view of the above points, and has as its object to propose a commutation type DC circuit breaker panel which can improve the workability and safety of maintenance inspection work and replacement work.

  In order to solve such a problem, in the present invention, a commutation that is connected between a DC power supply and a load and that interrupts the DC current by superimposing a charge accumulated in a commutation capacitor in a direction opposite to the DC current flowing through the main circuit. In a commutation type DC circuit breaker panel equipped with a type DC circuit breaker, a main switch for extinguishing the DC current flowing through the main circuit is mounted, and the main switch is turned off so as to cut off the energization of the main circuit. A main switch drive, a connection conductor for electrically connecting the main switch drive to other devices or components, the main switch drive, the connection conductor and the commutation capacitor are housed. A DC breaker storage box, wherein the main switch driving device is disposed at a lower stage of the DC breaker storage box so as to be movable in a predetermined direction for drawing out from the DC breaker storage box, Con The main switch is movably disposed in the same predetermined direction as the main switch driving device at a position below the main switch driving device at a lower stage of the DC breaker storage box, and the connection conductor is connected to the main switch. The connection conductor is wired so as to pass through a space between the driving device and the commutation capacitor, and the connection conductor has a first portion passing through the movement range of the commutation capacitor and a second portion not passing through the movement range of the commutation capacitor. And a contact for physically and electrically connecting the first and second parts in a separable manner.

  According to the commutation type DC breaker panel of the present invention having such a configuration, the main switch drive device is pulled out of the DC breaker storage box, and then the second portion of the connection conductor is cut off from the first portion. The commutation capacitor can be pulled out of the DC breaker storage box. Therefore, the maintenance and inspection work and replacement work of the commutation capacitor can be performed with high workability without using a special tool such as a lifter.

  In this commutation type DC circuit breaker panel, the main switch drive device and commutation capacitor, which are heavy items among the main devices constituting the commutation type DC circuit breaker, are arranged in the lower stage of the DC circuit breaker storage box. Therefore, the center of gravity is lowered, and the stability can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the commutation type DC breaker board which can improve the workability and safety of maintenance inspection work and replacement work can be realized.

FIG. 2 is a circuit diagram illustrating a schematic configuration of a DC cutoff device including a commutation DC breaker. It is a side view which shows the example of a structure of the conventional switchboard for DC circuits provided with the commutation type DC circuit breaker. It is a side view which shows the structural example of the switchboard for DC circuits of this Embodiment provided with the commutation type DC circuit breaker.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a DC interrupter provided with a commutation type DC interrupter C. In FIG. 1, a main circuit A including a main switch 5 and a saturable reactor 9 constituting a commutation type DC circuit breaker C is connected between a DC power supply 40 and a load 41.

  The commutation type DC circuit breaker C includes a commutation circuit B including a commutation capacitor 10 and a commutation switch 6 connected in series, and a commutation circuit B including a non-linear resistor 8. These two commutation circuits B are connected in parallel with the main circuit A. The nonlinear resistor 8 is an energy absorbing device for absorbing electromagnetic energy of the main circuit A.

  FIG. 2 shows a configuration example of a conventional DC circuit switchboard 1 on which the commutation type DC circuit breaker C having such a circuit configuration is mounted. In this DC circuit switchboard 1, main devices are arranged on a DC circuit breaker storage box 2, a rear storage box 3 installed on the back side of the DC circuit breaker storage box 2, and a front side of the DC circuit breaker storage box 2. And the front storage box 4. Then, standardized main devices constituting the commutation type DC circuit breaker C are housed in the DC circuit breaker housing box 2.

  In practice, a main switch drive 7 is disposed below the front side inside the DC breaker storage box 2. The main switch drive device 7 includes a main switch 5 for extinguishing the current flowing through the main circuit A, and a commutation switch 6 for supplying a current superimposed on the current flowing through the main circuit A. This is a main device having a function of driving the main switch 5 so that a current zero point is generated in the circuit A and the energization of the main circuit A is cut off.

  A plurality of wheels 7 </ b> A are provided on the lower surface of the main switch drive device 7, and the main switch drive device 7 includes a first switch 7 </ b> A in which these wheels 7 </ b> A are laid on the internal floor of the DC breaker storage box 2. By rolling on the rail 11A, it is possible to smoothly move on the first rail 11A.

  Behind the main switch drive 7, a non-linear resistor 8 constituting the commutation circuit B and a current change rate near the current zero point generated in the main circuit A which is installed in the main circuit A are reduced. And a saturable reactor 9 to be provided.

  Further, a commutation capacitor 10 for supplying a commutation current to the main switch 5 is provided above the non-linear resistor 8 and the saturable reactor 9. The commutation capacitor 10 smoothly moves on the second rail 11B by rolling a plurality of wheels 10A provided on the lower surface of the second rail 11B laid in the middle of the DC breaker storage box 2. It has been made mobile.

  Further, on the front side of the commutation capacitor 10, control devices 12 to 15 for controlling and operating respective devices housed in the DC circuit breaker housing box 2 are provided, respectively.

  Further, a bus 16 connected to an external DC power supply is provided at a lower position on the inner rear side of the DC breaker storage box 2, and this bus is provided in another space inside the DC breaker storage box 2. Connection conductors 17A, 17B, and 17C connected to 16 are provided, respectively.

  The main switch 5 and the commutation switch 6 are electrically connected to the respective devices, the bus 16 and the connection conductors 17A, 17B, 17C via disconnecting portions 18A to 18C, respectively. An overcurrent detector 19 for detecting an overcurrent is attached to the flowing connection conductor 17A.

  A rear storage box 3 is detachably attached to the rear (rear side) of the DC circuit breaker storage box 2 using a coupling tool such as a bolt and a nut.

  The rear storage box 3 is provided with a rear door 3A. By opening the rear door 3A, a worker can disconnect the fuse 20 installed inside the rear storage box 3, a protection relay 21 for circuit protection, The DC current transformer 22 for detecting the current of the circuit, the DC transformer for instrument 23, and the main circuit on the load side can be maintained and inspected. The load-side main circuit of the rear storage box 3 is formed by a lower drawer.

  A front storage box 4 is detachably attached to the front (front side) of the DC circuit breaker storage box 2 by using a coupling tool such as a bolt and a nut.

  The front storage box 4 is provided with a front door 4A. The front door 4A is opened, and the main switch driving device 7 housed in the DC breaker storage box 2 is moved to the inside of the DC breaker storage box 2. The main switch drive device 7 can be separated from the disconnecting portions 18A to 18C by moving on the first rail 11A so that the main switch 5 and the commutation switch 6 are maintained. It has been made to be able to do.

  On the back surface of the front door 4A of the front storage box 4, a switchboard control unit 24 composed of an auxiliary relay and a control switch for switchboard control, an indicator lamp for status display, a fault indicator and the like is attached. On the front side of the door 4A or on the rear side of the switchboard control unit 24, switches, indicator lights and / or fault indicators are arranged.

  Further, terminal blocks 25A to 25C for connecting electric cables are arranged on the inner side surface of the front storage box 4, and the switchboard control unit 24 and the DC breaker storage box 2 and the terminal blocks 25A to 25C are arranged via the terminal blocks 25A to 25C. Electrical connection is made to each device constituting the DC circuit switchboard 1 disposed inside the rear storage box 3.

  On the other hand, FIG. 3 in which parts corresponding to those in FIG. 2 are assigned the same reference numerals, shows a configuration example of a DC circuit switchboard 30 having a commutation type DC circuit breaker C ′ according to the present embodiment. In the DC circuit switchboard 30, the main switch drive 7 is disposed below the front side inside the DC circuit breaker storage box 2, and the disconnecting portions 18A to 18C are disposed on the rear side thereof.

  The main switch drive device 7 has a plurality of wheels 7A provided on the lower surface thereof roll on the shared rail 31 laid on the inner floor of the DC breaker storage box 2 to smoothly move on the shared rail 31. It is made to be able to move.

  A commutation capacitor 32 is disposed behind the disconnecting portions 18A to 18C. A plurality of wheels 32A having the same structure as the wheel structure of the main switch drive device 7 are provided on the lower surface of the commutation capacitor 32, and the wheels 32A roll on the common rail 31 so that the commutation capacitor 32 Can be smoothly moved on the common rail 31.

  Further, above the commutation capacitor 32 inside the DC circuit breaker storage box 2, the non-linear resistor 8 and the movable resistor 8 are arranged so as not to interfere with the moving range (movable range) of the commutating capacitor 32 moving on the shared rail 31. A saturated reactor 9 is provided. The connection conductor 33 that connects the saturable reactor 9 and the disconnecting portion 18C is wired so as to pass through the physical space between the disconnecting portions 18A to 18C and the commutation capacitor 32.

  In this case, the connection conductor 33 is divided into a first conductor portion 33A passing through the movement range of the commutation capacitor 32 moving on the shared rail 31 and a second conductor portion 33B not passing through the movement range of the commutation capacitor 32. The first and second conductor portions 33A, 33B are separated physically and electrically via a commutation capacitor lead-out contact 35A at a position above the moving range of the commutation capacitor 32. Connected.

  Similarly, the connection conductor 34 that connects between the disconnecting fuse 20 and the disconnecting portion 18B is wired so as to pass through the physical space between the disconnecting portions 18A to 18C and the commutation capacitor 32. The connection conductor 34 is divided into a first conductor portion 34A passing through the movement range of the commutation capacitor 32 moving on the shared rail 31 and a second conductor portion 34B not passing through the movement range of the commutation capacitor 32. The first and second conductor portions 34A and 34B are physically and electrically detachably separated via a commutation capacitor lead-out contact 35B at a position above the movable range of the commutation capacitor 32. It is connected.

  As the commutation capacitor lead-out contacts 35A, 35B, for example, a type in which the first conductor portions 33A, 34A and the second conductor portions 33B, 34B are sandwiched between two conductor plates is also opposed. Insertion holes are provided on the two side surfaces, respectively, and the tip portions of the first conductor portions 33A and 34A are inserted into the insertion holes on one side surface, and the tip portions of the second conductor portions 33B and 34B are inserted into the insertion holes on the other side surface. The first conductor portions 33A, 34A and the second conductor portions 33B, 34B may be physically and electrically connected by inserting the first conductor portions 33A, 34A. In short, as long as the first conductor portions 33A and 34A and the second conductor portions 33B and 34B can be physically and electrically connected so as to be separable, the commutation capacitor lead-out contacts 35A and 35B include: Various configurations can be widely applied.

  In the commutation type DC circuit breaker C ′ according to the present embodiment having the above-described configuration, the main switch drive device 7 is pulled out of the DC circuit breaker storage box 2 so as to move on the common rail 31, and then each connection is performed. The first conductor portions 33A, 34A of the conductors 33, 34 are separated from the second conductor portions 33B, 34B by being detached from the commutation capacitor lead-out contacts 35A, 35B, respectively, thereby causing interference with other devices and components. The commutation capacitor 32 can be moved on the common rail 31 and pulled out of the DC circuit breaker storage box 2 without performing the operation.

  After that, the commutation capacitor 10 is pushed into the DC circuit breaker storage box 2 and moved on the common rail 31 to return to the original position. Then, the first conductor portion 33A of each of the connection conductors 33 and 34 is formed. , 34A are physically and electrically reconnected to the second conductor portions 33B, 34B using the commutation capacitor lead-out contacts 35A, 35B, and the main switch drive device 7 is connected to the DC breaker storage box 2. By pushing it inside and moving it on the shared rail 31 to return to the original position, the main switch drive device 7 can be returned to the original state where it is physically and electrically connected to the disconnecting parts 14A to 14C.

  Therefore, according to the commutation type DC circuit breaker C ′, heavy objects such as the main switch drive device 7 and the commutation capacitor 32 can be put in and out of the DC circuit breaker storage box 2 without using a special tool such as a lifter. it can.

  Further, according to the commutation type DC circuit breaker C ′, heavy objects such as the main switch drive device 7 and the commutation capacitor 32 can be put in and taken out of the DC circuit breaker storage box 2 without using a special tool such as a lifter. It does not require extra space for installing special tools at the time of inspection, and the maintenance and inspection work and replacement work of the main switch drive 7 and the commutation condenser 32 can be performed safely even in a narrow substation.

  Furthermore, in the commutation type DC circuit breaker C ', since the main switch drive device 7 and the commutation capacitor 32 are arranged at the lower stage of the DC circuit breaker storage box 2 as described above, the main commutation type DC circuit breaker C' The center of gravity of ′ is lower than that of the conventional commutation type DC circuit breaker C described above with reference to FIG. 2, and the mechanical stability and reliability can be improved accordingly.

  Further, in the commutation type DC circuit breaker C ′, the rail for the main switch drive device 7 and the rail for the commutation capacitor 32 are formed by one common rail 31, so that the conventional commutation The number of components can be reduced as compared with the DC breaker C, and the manufacturing cost can be reduced accordingly.

  Further, in the conventional commutation type DC circuit breaker C described above with reference to FIG. 2, the connection of the cable to the commutation capacitor 10 (FIG. 2) had to be performed from above the DC circuit breaker storage box 2. In the DC breaker C ′, since the connection of the cable to the commutation capacitor 32 can be performed inside the DC breaker storage box 2, maintenance of the main switch drive device 7 and the commutation capacitor 32 is performed during manufacturing. The workability at the time of inspection and at the time of replacement can be greatly improved, and accordingly, the manufacturing cost and the maintenance cost can be reduced.

  In the above-described embodiment, the case where the present invention is applied to the commutation type DC circuit breaker C ′ configured as shown in FIG. 3 has been described. However, the present invention is not limited to this. It can be widely applied to commutation type DC circuit breakers of various configurations.

  In the above-described embodiment, the connection conductors 33 and 34 are connected to the first conductor portions 33A and 34A that pass through the moving range of the commutation capacitor 32 that moves on the shared rail 31, and the second conductors that do not pass through the moving range. Has been described as having a two-part structure that can be separated into the conductor portions 33B and 34B, but the present invention is not limited to this, and the connection conductors 33 and 34 may have a three-part or more divided structure. Good.

  Further, in the above-described embodiment, the connection conductor 33 connecting between the saturable reactor 9 and the disconnection portion 18C and the connection conductor 34 connecting between the disconnection type fuse 20 and the disconnection portion 18B are moved on the shared rail 31. A case has been described in which a two-part structure is used which can be separated into first conductor parts 33A and 34A passing through the movement range of the commutation capacitor 32 and second conductor parts 33B and 34B not passing through the movement range. The present invention is not limited to this, but the point is that the connection conductor wired through the space between the main switch drive device 7 and the commutation capacitor 32 is connected to the first conductor portion 33A passing through the moving range of the commutation capacitor 32. , 34A, and the second conductor portions 33B, 34B that do not pass through the movement range, the connection conductor is connected to the main switch drive device 7 and what kind of device. Or between components or may be electrically connected.

  The present invention can be widely applied to commutation type DC circuit breaker panels of various configurations.

  1, 30 DC switchboard, 2 DC breaker storage box, 3 rear storage box, 4 front storage box, 5 main switch, 6 commutation switch, 7 Main switch drive, 7A, 32A Wheel, 8 Non-linear resistor, 9 Saturable reactor 10, 32 Commutation capacitor, 11A, 11B Rail, 16 Bus, 17A ... 17C ... connecting conductor, 18A-18C ... disconnecting part, 19 ... overcurrent detector, 31 ... shared rail, 33, 34 ... connecting conductor, 33A, 33B, 34A, 34B ... connecting conductor, 35A , 35B ... commutation capacitor lead-out contact, A ... main circuit, B ... commutation circuit, C ... commutation type DC circuit breaker.

Claims (3)

A commutation type equipped with a commutation type DC circuit breaker, which is connected between a DC power supply and a load, and cuts off the DC current by superimposing the electric charge accumulated in the commutation capacitor in the opposite direction to the DC current flowing through the main circuit. In DC breaker panels,
A main switch for driving the main switch to cut off the direct current flowing through the main circuit, and driving the main switch so as to cut off the current supply to the main circuit;
A connection conductor for electrically connecting the main switch drive to another device or component,
Having a DC breaker storage box in which the main switch drive device, the connection conductor and the commutation capacitor are stored;
The main switch drive device is disposed at a lower stage of the DC breaker storage box so as to be movable in a predetermined direction for being pulled out from the DC breaker storage box,
The commutation capacitor is disposed movably in the same predetermined direction as the main switch drive, at a position behind the main switch drive at a lower stage of the DC breaker storage box,
The connection conductor is wired so as to pass through a space between the main switch drive device and the commutation capacitor,
The connection conductor,
A first portion passing through a moving range of the commutation condenser;
A second portion that does not pass through the movement range of the commutation condenser;
And a contact for physically and electrically connecting the first and second parts in a separable manner. A commutation type DC circuit breaker panel. Comprising a rail laid on the floor of the DC breaker storage box,
The commutation type DC circuit breaker panel according to claim 1, wherein the main switch drive device and the commutation capacitor are arranged on the rail so as to be movable on the rail. A saturable reactor that superimposes the electric charge accumulated in the commutation capacitor in a direction opposite to the DC current flowing through the main circuit to reduce a current change rate near a current zero point generated in the main circuit. ,
The saturable reactor is disposed above the commutation capacitor in the DC breaker storage box so as not to interfere with the movement range of the commutation capacitor,
The commutation type DC circuit breaker panel according to claim 2, wherein the connection conductor connects between the main switch drive device and the saturable reactor.

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