JP5714127B2 - Switchgear - Google Patents

Description

  The present invention relates to a switch gear used in, for example, a power receiving / transforming facility.

  The conventional switchgear has a pull-out type circuit breaker mounted on the floorboard of the circuit breaker room located in the middle of the switchgear, and a grounding switch is installed in the circuit breaker room and the cable room at the rear. An operating mechanism and an interlock mechanism for the earthing switch are arranged at the lower part, and the circuit breaker room floor board also has a function of partitioning from the cable room.

  The pull-out type circuit breaker can be moved in the horizontal direction by operating the circuit breaker pull-out mechanism provided in the upper part of the circuit breaker room floor board in the switchgear circuit breaker room. It is a structure which connects or disconnects from the side terminal.

  The operation mechanism of the earthing switch arranged in the cable room and the drawing-out mechanism of the circuit breaker are mechanically interlocked. (For example, see Patent Document 1)

Japanese Patent No. 4698741

In the case of the above-described conventional switchgear described in Patent Document 1, in the case of maintenance and inspection in the busbar room, the ceiling plate is removed from the upper part of the switchgear, and the soundness of the insulator and busbar conductor connection in the busbar room is determined. Although it is generally confirmed, if the ceiling height of the electrical room where the switchgear is installed is low and the busbar room cannot be accessed from the ceiling, pull-out type circuit breakers should be placed outside the switchgear. With the operator pulled out and entering the breaker compartment, the partition cover between the breaker compartment and the bus compartment must be removed and the inside of the bus compartment must be inspected. In order to secure space, it is necessary to enlarge the circuit breaker room.
For this purpose, it is necessary to ensure that the circuit breaker room has enough space for workers to enter and work more than the space required for the operation function of the circuit breaker. Sometimes.

In addition, in the case of inspection and maintenance of a current transformer, a grounding switch, its operation mechanism, an interlock mechanism, etc. in the cable room, it is generally performed by working from the bottom of the circuit breaker room.
For this reason, it is necessary to secure the space under the circuit breaker room so that a person can sufficiently enter the work.

  Also, since the earthing switch body is located at the rear of the circuit breaker chamber, and the operation mechanism and interlock mechanism of the earthing switch are located under the floor of the circuit breaker room in the switchgear, assembly adjustment must be performed in the switchgear. As a result, the workability of the assembly adjustment deteriorates. In this respect, the switchgear is reduced in size and the space in the electric room is hindered. A compact switchgear that can be made space-saving has been desired.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and its object is to provide a switchgear that can be easily assembled and maintained and inspected and that can greatly reduce the space required for an electric room. Is to provide.

A switchgear according to the present invention is a switchgear having a circuit breaker compartment and a cable compartment defined in a switchgear housing, the circuit breaker being located in the circuit breaker compartment, and being located in the cable compartment. The circuit breaker is mounted, and the upper surface portion constitutes a partition between the circuit breaker compartment and the cable compartment in a state where the circuit breaker is inserted into the cable compartment, and in the state where the circuit breaker is pulled out from the cable compartment, the circuit breaker compartment and the A cart that opens a partition between cable compartments, a grounding switch mounted on the cart, and an operating mechanism for the grounding switch mounted on the cart .

  According to the switchgear according to the present invention, it is possible to obtain a switchgear that can be easily assembled and maintained and inspected, and that can greatly save the space of the electric room.

It is a sectional side view block diagram which shows the switchgear concerning Embodiment 1 of this invention. It is a sectional side view block diagram which shows the state which pulled out the trolley | bogie which mounts the circuit breaker and earthing switch in the switchgear concerning Embodiment 1 of this invention. It is a side block diagram of the trolley | bogie carrying the circuit breaker and earthing switch in the switchgear concerning Embodiment 1 of this invention. It is a sectional side view block diagram which shows the switchgear concerning Embodiment 2 of this invention. It is a sectional side view block diagram which shows the switchgear concerning Embodiment 3 of this invention. It is a sectional side view block diagram which shows the state which opened the door in the switchgear concerning Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. In the drawings, the same or equivalent members and parts will be described with the same reference numerals. 1 is a side sectional view showing a switchgear according to Embodiment 1 of the present invention. FIG. 2 is a side sectional configuration diagram showing a state in which a cart mounted with a circuit breaker and a grounding switch in the switchgear according to Embodiment 1 of the present invention is pulled out. FIG. 3 is a side configuration diagram of a carriage equipped with a circuit breaker and a ground switch in the switchgear according to Embodiment 1 of the present invention.

  In FIG. 1, the metal closed type switchgear 1 is entirely covered with a grounded metal housing 2, and each section of the control compartment 300, the circuit breaker compartment 400, the busbar compartment 150, and the cable compartment 500 is grounded metal or It is a metal clad type switchgear or compartment type switchgear partitioned with an insulator.

  The front side of the switchgear 1 is provided with the door 3 of the control compartment 300, the door 4 of the circuit breaker compartment 400, and the door 5 of the cable compartment 500. The door is opened and closed as necessary, and the equipment in each compartment is inspected and maintained. Can be used.

  When an arc accident or the like occurs in the circuit breaker compartment 400, the bus compartment 150, or the cable compartment 500, the ceiling of the switchgear 1 is released to release air that has been heated and expanded by arc heat or the like and has become high temperature and pressure. A pressure flapper is provided.

  6 is a pressure release flapper of the circuit breaker compartment 400, 7 is a pressure release flapper of the bus compartment 150, and 8 is a pressure release flapper of the cable compartment 500. Since the control compartment 300 generates a small amount of energy in the event of an accident in the control compartment 300, such a pressure release flapper is generally unnecessary. Of course, in the circuit breaker compartment 400, the bus compartment 150, and the cable compartment 500, if the generated energy in each compartment is small, a ground metal cover is provided instead of the pressure release flapper.

  9 is a partition plate between the control compartment 300 and the circuit breaker compartment 400, 10 and 11 are partition plates between the circuit breaker compartment 400 and the busbar compartment 150, and the partition plate 10 is removed from the circuit breaker compartment 400 side by means such as a bolt, It is configured so that it can be reattached, and when it is removed, an opening is formed so that the soundness and maintenance of each device in the bus compartment 150 such as the bus 15, the bus-side conductor 16, and the insulating support 17 can be checked. .

  12 and 13 are partition plates between the circuit breaker compartment 400 and the cable compartment 500, and 14 is a partition plate between the bus compartment 150 and the cable compartment 500. The partition plate 9 to the partition plate 14 may be made of a ground metal or an insulator.

  The main circuit path in the switchgear 1 includes bus 15, bus-side conductor 16, its insulation support 17, bus-side primary bushing 18, circuit breaker 26, cable-side primary bushing 19, conductor 20, current transformer 21, cable side A conductor 22 is connected to an external device by a cable 24. Reference numeral 25 denotes a shielding device for a through portion of the cable 24 such as a cable gland provided in the switch gear 1.

  The circuit breaker 26 is a pull-out type, and can be horizontally reciprocated in the depth direction of the switch gear 1 between the connection position 26a and the disconnection position 26b indicated by a one-dot chain line by the circuit breaker drawing mechanism 27 of the circuit breaker 26. The upper primary junction 28 of the circuit breaker 26 is connected to the terminal portion of the bus-side primary bushing 18, and the lower primary junction 29 of the circuit breaker 26 is connected to the terminal portion of the cable-side primary bushing 19.

  Reference numerals 30 and 31 denote an upper shutter device and a lower shutter device that move up and down in the vertical direction in conjunction with the horizontal reciprocating movement of the circuit breaker 26. In the state shown in FIG. The disconnecting position 26b is configured to move downward from the state of FIG. 1 and cover the terminal portions of the bus side primary bushing 18 and the cable side primary bushing 19.

  Reference numeral 32 denotes a carriage on which the circuit breaker drawing mechanism 27 and the circuit breaker 26 are mounted. A grounding switch 33 is mounted on the rear part (right side in FIG. 1) of the trolley 32. In the first embodiment, a case of a blade-shaped grounding switch is shown, and 33a is a movable blade of the grounding switch 33 and is in an “open” state. Reference numeral 33b denotes a structure in which the movable blade 33a of the grounding switch 33 is in the “closed” state, and the movable blade 33a moves at a predetermined angle about the shaft 33c. The fixed terminal 34 of the ground switch 33 is insulated and supported together with the ground junction 35 configured to be connected to the terminal 23 provided on the cable-side conductor 22 when the carriage 32 is inserted into a predetermined position in the switchgear 1. It is supported by an object 36.

  Reference numeral 37 denotes an operation mechanism for driving the ground switch 33, and 38 denotes a ground switch mechanism provided between the operation mechanism 37 and the ground switch 33. Reference numeral 39 denotes an interlock mechanism configured between the ground switch 33 and the circuit breaker 26 or the circuit breaker drawing mechanism 27. Reference numeral 40 denotes a wheel mounted on the carriage 32.

  The height of the carriage 32 is lower than the partition plate 13 between the circuit breaker compartment 400 and the cable compartment 500 of the switchgear 1, and the carriage 32 is inserted and mounted at a predetermined position of the switchgear 1 together with the depth dimension thereof. The upper plate of 32 overlaps with a part of the partition plate 13 provided in the switchgear 1 so that a partition between the circuit breaker compartment 400 and the cable compartment 500 is configured.

  FIG. 2 shows a state in which the cart 32 in which the circuit breaker 26 and the earthing switch 33 are collectively mounted in the switch gear 1 of the first embodiment is pulled out of the switch gear 1. FIG. 3 shows a cart 32 in which the circuit breaker 26 and the grounding switch 33 etc. that are pulled out from the switchgear 1 are mounted together.

  In FIG. 2, the door 4 of the circuit breaker compartment 400 and the door 5 of the cable compartment 500 are shown open. Reference numeral 41 denotes each door hinge. The upper shutter 30a of the upper shutter device 30 that covers the terminal portion of the bus-side primary bushing 18 of the switch gear 1 and the lower shutter 31b of the lower shutter device 31 that covers the terminal portion of the cable-side primary bushing 19 are shown closed. Details of the operation of the circuit breaker 26 and the earthing switch 33, the operation of the interlock mechanism, etc. are not directly related to the elements of the present invention, so that the description thereof is omitted.

  In the normal medium voltage class metal closed type switchgear 1, the switchgear 1 has a height of about 2000 mm to 2300 mm due to the insulation design (air insulation distance) of the switchgear 1 and the size of the storage device. The width of the gear 1 is about 600 mm to 700 mm, and the space left by pulling out the circuit breaker 26 and the carriage 32 is such that the operator can enter in a substantially normal posture.

  Therefore, an operator can enter the space after the drawer, and maintenance and inspection of the equipment and conductors in the cable room, and the bus bar room can be easily removed by removing the partition plate 10.

  42 is a ground bus, and after pulling out the carriage 32 to the outside of the switchgear 1, when an operator enters the switchgear 1 and performs inspection and maintenance of each part, the cable side is charged due to an erroneous operation or the like. In order to prevent electric shock, the ground lead 43 can be attached to ground the cable circuit.

  As shown in FIG. 3, the circuit breaker 26 drawn out of the switchgear 1 includes a circuit breaker drawing mechanism 27, a ground switch 33, an operation mechanism 37 of the ground switch 33, a ground switch mechanism 38, and an interlock mechanism 39. Etc. are mounted on the carriage 32 and have the wheels 40. Therefore, it is easy to move to a place where maintenance work is easy to perform, and inspection work can be performed from all around them.

  As described above, according to the first embodiment, the breaker 26 is connected to the carriage 32 constituting a part of the partition plate of the breaker compartment 400 and the cable compartment 500 in a state where the switchgear 1 is inserted and installed at a predetermined position. The circuit breaker drawing mechanism 27, the earthing switch 33, the operation mechanism 37, the earthing opening / closing mechanism 38, and the interlock mechanism 39 are installed in a lump so that the cart 32 can be pulled out to the outside of the switchgear 1. Therefore, without increasing the size of the switchgear 1, no maintenance space is required in the rear part and the ceiling part of the switchgear 1, and the electric room can be reduced. The work of each part of the switchgear 1 is easy and reliable. A small switchgear 1 capable of high maintenance and inspection can be obtained.

  That is, at the time of maintenance and inspection of the switchgear 1, the circuit breaker 26, the pull-out operation mechanism 27 of the circuit breaker 26 and the grounding switch 33, the operation mechanism 37 of the grounding switch 33 and the circuit breaker 26 and the grounding switch 33 are arranged. The interlock mechanism 39 is pulled out from the casing 2 of the switchgear 1 together with the carriage 32 which is a partition between the circuit breaker compartment 400 and the cable compartment 500, so that the circuit breaker compartment 400 and the cable compartment 500 inside the switchgear 1 are pulled out. There are no partitions between them, and the necessary maintenance work space can be secured.

  Even in the maintenance and inspection work in the bus compartment 150, since the cable compartment 500 and the circuit breaker compartment 400 communicate with each other, access to the bus compartment 150 can be performed in a natural posture, so that maintenance workability is also good. Since work from the ceiling of the switchgear 1 is not required, safety measures for work at high places are not required, a work space is not required on the top of the switchgear 1, and the height of the electric room can be reduced.

  In addition, the work required for maintenance of the mechanical parts such as the wear inspection of the mechanism and the grease up, such as the circuit breaker 26, the ground switch 33, the operation mechanism 37 of the ground switch 33 and the interlock mechanism 39, are all mounted on the carriage 32. Since it is drawn out to the outside of the switchgear 1, it can be accessed from the entire periphery of the carriage 32, and the maintenance work and the reliability of inspection can be improved, for example, a small part can be reliably maintained and inspected.

  Therefore, since the switchgear 1 according to the first embodiment does not require operation and maintenance from the back side of the switchgear 1, an arrangement configuration in which the back side is abutted against the wall of the electric chamber is possible, and a work space on the ceiling is also possible. This is unnecessary and has the effect of greatly reducing the space in the electrical room.

  Further, in the past, it has been common to use a lifting device such as a lifter when pulling out the front of the switchgear for maintenance inspection of the drawer type circuit breaker. In 1, it becomes unnecessary, and it is not necessary to secure the storage space. For example, there is an effect of obtaining equipment with low manufacturing cost and transportation cost due to minimization of containers such as a package house type power receiving / transforming equipment.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. 4 is a side sectional view showing a switchgear according to Embodiment 2 of the present invention.

  In FIG. 4, 44 is an insulating bushing having a conductor penetrating inside, 45 is an instrument transformer, 46 is a primary protection fuse of the instrument transformer 45, 47 is a through-type current transformer (shown in cross section in the figure), Reference numeral 48 denotes an insulating support. Others are the same as those in FIG.

  The switch gear 1 shown in FIG. 4 is applied to, for example, a power receiving circuit, and includes a circuit portion of the cable 24 provided with an instrument transformer 45 and a ground switch 33. An insulating bushing 44 penetrating the conductor is provided on the insulating support 36 of the fixed terminal 34 of the ground switch 33, and an instrument transformer 45 is connected to the inside of the carriage 32 via a primary protection fuse 46.

  The switchgear 1 shown in the second embodiment has an instrument transformer 45, a primary protection fuse 46, and a secondary protection fuse (not shown) efficiently mounted on the carriage 32 in addition to the first embodiment described above. Conventionally, when access from the rear side of the switchgear 1 is not possible, the switchgear 1 is widened so as not to hinder the maintenance and inspection of the cable section, or a separate housing is provided for storing the instrument transformer 45 and the like. It was necessary to configure the body as a row board, and there was a problem that the electric room was enlarged, but this could be solved, and a small switchgear 1 of the same size regardless of the presence or absence of the instrument transformer 45 Can do.

Embodiment 3 FIG.
Embodiment 3 of the present invention will be described with reference to FIGS. 5 and 6. In the drawings, the same or corresponding members and parts will be described with the same reference numerals. FIG. 5 is a side sectional view showing a switchgear according to Embodiment 3 of the present invention. FIG. 6 is a side sectional view showing a state in which a door is opened in a switchgear according to Embodiment 3 of the present invention.

  In FIG. 5, 49 is an integral door, and 50 is a partition plate formed on the integral door 49. The integrated door 49 is a front door of both the circuit breaker compartment 400 and the cable compartment 500 below it, and the circuit breaker compartment 400 and the cable compartment 500 are partitioned by the partition plate 50 in a state where the integrated door 49 is closed. is there.

  FIG. 6 shows a state in which the integrated door 49 is opened. The partition plate 50 is formed in a substantially plate-like protrusion on the inner surface of the integrated door 49, and both ends of the integrated door 49 in the width direction of the switch gear 1. A notch is formed so as not to mechanically interfere with the column of the housing 2. A partition between the circuit breaker compartment 400 and the cable compartment 500 is formed by entering the upper part of the upper surface of the carriage 32 with the integrated door 49 closed.

  Since the switch gear 1 according to the third embodiment can reduce the number of door parts, a more inexpensive switch gear 1 can be obtained.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  The present invention is suitable for realizing a switchgear that can secure a necessary maintenance and inspection work space inside the switchgear.

DESCRIPTION OF SYMBOLS 1 Switchgear 2 Case 4 Door of circuit breaker compartment 5 Door of cable compartment 9 Partition plate 10 Partition plate 11 Partition plate 12 Partition plate 13 Partition plate 14 Partition plate 15 Busbar 26 Circuit breaker 32 Dolly 33 Grounding switch 35 Ground junction 37 Operating mechanism 39 Interlock mechanism 45 Instrument transformer 46 Fuse 49 Integrated door 50 Partition plate 400 Breaker compartment 500 Cable compartment

Claims (7)

A switchgear having a circuit breaker compartment and a cable compartment partitioned in a switchgear housing, wherein the circuit breaker is located in the circuit breaker compartment, and the circuit breaker is mounted in the cable compartment. A carriage that configures a partition between the circuit breaker compartment and the cable compartment in a state of being inserted into the cable compartment, and that opens a partition between the circuit breaker compartment and the cable compartment in a state of being pulled out from the cable compartment ; A switchgear comprising a grounding switch mounted on the carriage and an operating mechanism for the grounding switch mounted on the carriage .   2. The switchgear according to claim 1, wherein the partition is configured by an upper surface portion of the carriage.   The switchgear according to claim 1 or 2, wherein the circuit breaker is a drawer type circuit breaker. Switchgear according to claim 1, further comprising a grounding junctions connecting with the main circuit section conductors of the switchgear to the high voltage side terminal of the earthing switch. The switchgear according to claim 1 or 4 , wherein an interlock mechanism between the ground switch and the circuit breaker is mounted on the carriage. The switchgear according to any one of claims 1 to 5 , wherein an instrument transformer and a fuse are mounted on the carriage. The circuit breaker compartment and the cable compartment door are configured as an integral door, and a part of a partition between the circuit breaker compartment and the cable compartment is configured with the integral door closed inside the integral door. The switchgear according to any one of claims 1 to 6 , further comprising a partition plate arranged in such a manner.

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