JP5220680B2 - Switchgear - Google Patents

Description

  The present invention relates to a switch gear applied to a power receiving / distribution facility, and more particularly to an improvement in a mounting structure of a control circuit mounted on the switch gear.

The switchgear contains a circuit breaker and instrument transformer (instrument current transformer and instrument transformer) in the box, and a control circuit that monitors or controls these devices can open and close the front opening of the box. Attached to the closing front door.
The switchgear control circuit includes a multi-relay in which protection, measurement, display, and operation functions are integrated into one device, and a control auxiliary device for configuring the system in combination with the multi-relay. That is, the multi-relay is composed of a protective relay such as an overcurrent relay and a ground fault relay, a measuring instrument such as an ammeter and an integrating wattmeter, a display device such as a status display lamp, and an operating device such as an operation switch. Auxiliary equipment consists of auxiliary relays such as a latch relay for externally monitoring the state of the multi-relay.

The multi-relay is attached to the back surface of the front door, but a part of the multi-relay appears through the front door window and appears on the front surface. Therefore, the multi-relay is arranged in accordance with customer requirements such as design, visibility, and operability. On the other hand, the auxiliary equipment for control is arranged on the back side of the front door or in the box, and the arrangement design for each customer is performed in accordance with the equipment installation on the front face of the door.
For example, the switchgear shown in Patent Document 1 has a measurement / protection / control device attached to a door, two support brackets are provided on both sides of the back of the door, and one support bracket can be rotated via a hinge. Small control parts such as auxiliary relays can be freely attached to a mounting plate having a large number of supported holes like a hanger board, and control small parts such as measurement / protection / control devices and auxiliary relays are mounted inside the box. It is designed to be attached to the switchgear door in a lump without being distributed to the adjacent panel.

  In such a switchgear, in addition to the wiring for connecting the multi-relay and the auxiliary device, a wiring for connecting the secondary terminal of the instrument transformer and the multi-relay is required. Of these wires, the wire connecting the secondary terminal of the instrument transformer and the multi-relay is housed in a wiring duct provided along the inner wall of the side surface of the box or the back surface of the front door. The wiring connecting the multi-relay and the auxiliary device is housed in a wiring duct provided on the back surface of the front door.

Japanese Utility Model Publication No. 5-25903

In the switchgear shown in Patent Document 1, the wiring is housed in the wiring duct provided along the inner wall of the side surface of the box, but generally the wiring of the switchgear is used for control. In order to place the auxiliary equipment on the back of the door, the wiring that connects the secondary terminal of the current transformer and the transformer and the multi-relay and the wiring that connects the multi-relay and the auxiliary equipment are on the back of the front door. It will be mixed in the duct for wiring provided in.
In such a case, the surge generated in the main circuit to which the circuit breaker is connected shifts from the secondary wiring of the instrument current transformer or instrument transformer to the control circuit, causing a problem that the control circuit malfunctions. It was.
In addition, in order to suppress surges that transfer from the secondary wiring of instrument current transformers and instrument transformers to the control circuit, wiring that connects the secondary terminals of instrument current transformers and instrument transformers to the multi-relay If the wiring path of the wiring connecting the multi-relay and the auxiliary device is divided, a wiring duct is added separately, and there is a problem that the space for arranging the devices is pressed.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a highly reliable switchgear that is not affected by a surge or the like only by devising the arrangement of wiring connected to a multi-relay. It is what.

  In the switchgear according to the present invention, it is attached to the front door of the box housing the circuit breaker and the transformer for the instrument, and is arranged on the back of this multirelay with integrated protection, measurement, display and operation functions. And an auxiliary device for control used in combination with the multi-relay, a connection surface of the wiring connecting the multi-relay and the auxiliary device to the multi-relay, and a multi-wiring connecting the instrument transformer and the multi-relay. The connection surface for the relay is different.

  This invention can separate the wiring connecting the instrument transformer and the multi-relay and the wiring connecting the multi-relay and the auxiliary equipment, and the surge superimposed on the secondary wiring of the instrument transformer is the wiring of the control circuit. Since the control auxiliary device is arranged on the back surface of the multi-relay, the switchgear with high reliability can be obtained without pressing the device arrangement space on the door surface.

It is the schematic for demonstrating the whole structure of the switchgear in embodiment of this invention. It is a perspective view for demonstrating back arrangement | positioning of the control circuit in the switchgear of Embodiment 1 of this invention. FIG. 3 is a perspective view in which some components are omitted from the rear surface arrangement of the control circuit shown in FIG. 2. It is a perspective view for demonstrating back arrangement | positioning of the control circuit in the switchgear of Embodiment 2 of this invention. It is a perspective view for demonstrating back arrangement | positioning of the control circuit in the switchgear of Embodiment 3 of this invention. It is a perspective view for demonstrating back arrangement | positioning of the control circuit in the switchgear of Embodiment 4 of this invention. It is a figure for demonstrating the structure for shielding a noise in Embodiment 4 of this invention. It is a figure for demonstrating the structure for shielding a noise in Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, the switchgear in Embodiment 1 of this invention is demonstrated based on FIG. 1 thru | or FIG. FIG. 1 shows a schematic diagram of device arrangement and wiring paths in the overall configuration, FIG. 2 shows a perspective view of the arrangement configuration of the control circuit, and FIG. 3 shows the components shown in FIG. The perspective view which abbreviate | omitted one part is shown.
The switch gear shown in FIG. 1 includes a rectangular box 1 and a front door 2 which is attached to the front opening of the box 1 and closes the front opening so as to be opened and closed. A breaker 3 provided in a main circuit (not shown) for connecting a power source and a load is housed in the box 1 so as to be freely inserted and removed. Furthermore, in the box 1, an instrument current transformer 4 for detecting a current flowing in the main circuit and an instrument transformer 5 for detecting the voltage of the main circuit are accommodated. (Hereinafter, the instrument current transformer 4 and the instrument transformer 5 are collectively referred to as an instrument transformer)

On the back side of the front door 2, a multi-relay 6 constituting a switchgear control circuit, and a control auxiliary device disposed on the back of the multi-relay 6 and connected to the multi-relay 6 and wiring 7 are used. 8 is attached.
Multi-relay 6 integrates protection, measurement, display, and operation functions into a single device. Protective relays such as overcurrent relays and ground fault relays, measuring instruments such as ammeters and integrating wattmeters, and status displays It consists of a display device such as a lamp and an operation device such as an operation switch. The auxiliary device 8 is composed of an auxiliary relay such as a latch relay for externally monitoring the state of the multi-relay 6. That is, the auxiliary device 8 constitutes a switch gear control circuit for configuring the system in combination with the multi-relay 6 in order to monitor the operation of the circuit breaker 3 and the main circuit.
Some of the measuring devices of the multi-relay 6, display lamps, operation switches, and the like pass through the window of the front door 2 and appear on the front.

On the back surface side of the front door 2, a wiring duct 9a extending vertically and a wiring duct 9b extending horizontally so as to intersect the wiring duct 9a are provided. In these wiring ducts 9a and 9b, a part of the wiring 10 connecting the secondary terminal of the instrument current transformer 4 and the multi-relay 6 and the secondary terminal of the instrument transformer 5 and the multi-relay 6 are connected. A part of the wiring 11 to be connected is accommodated.
The connection surface of the wiring 7 that connects the multi-relay 6 and the auxiliary device 8 is a wiring 10 that connects the secondary terminal of the instrument transformer (the instrument current transformer 4 and the instrument transformer 5) and the multi-relay 6. , 11 is different from the connection surface. That is, the wiring 7 that connects the multi-relay 6 and the auxiliary device 8 is arranged on the side of the multi-relay 6, and the wiring 10 that connects the secondary terminals of the instrument transformers 4 and 5 and the multi-relay 6. 11 is arranged so as to come to the lower surface of the multi-relay 6.
In this way, the wiring 7 that connects the multi-relay 6 and the auxiliary device 8 and the wirings 10 and 11 that connect the secondary terminals of the instrument transformers 4 and 5 and the multi-relay 6 are not arranged in parallel. Is separated from the wirings 10 and 11 connected to the secondary terminals of the instrument current transformer 4 and the instrument transformer 5 via the wiring 7 to the control circuit (multi-relay 6 and auxiliary equipment 8). Surge can be suppressed, and the problem that the control circuit malfunctions is eliminated.

Next, a specific configuration of the control circuit will be described with reference to FIGS.
In FIG. 2, the multi-relay 6 is fixed and attached to the back surface of the front door 2, and a part of the multi-relay 6 passes through the window of the front door 2 and appears on the front surface. Two upper and lower instrument mounting frames (first support frames) 12 are fixed in parallel on the back surface of the front door 2 by welding or the like so as to sandwich the multi-relay 6. A convex rear arrangement frame (second support frame) 13 for arranging the control auxiliary device 8 on the rear surface of the multi-relay 6 is provided between the upper and lower appliance mounting frames 12 by a fastening portion 14 such as a screw. Two are fixed to the left and right. A mounting plate 15 for arranging the control auxiliary device 8 on the back surface of the multi-relay 6 is fixedly attached to the left and right back surface arranging frames 13. Then, the control auxiliary device 8 is mounted and mounted on the mounting plate 15, and the control auxiliary device 8 is disposed on the back of the multi-relay 6.

Furthermore, the wiring 10 to which the multi-relay 6 and the secondary terminal of the instrument current transformer 4 are connected, the wiring 11 to which the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected, the multi-relay 6, The connection position of the wiring 7 connecting between the control auxiliary devices 8 (hereinafter also referred to as the control wiring 7) to the multi-relay 6 is shown in FIG. As is clear from the omitted FIG. 3, the wiring 10 connecting the multi-relay 6 and the secondary terminal of the current transformer 4 and the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected. Since the connection surface 6a of the wiring 11 to the multi-relay 6 is on the lower surface of the multi-relay 6, the multi-relay 6
The connection surface 6b of the control wiring 7 connecting the control auxiliary device 8 to the multi-relay 6 is formed on the left surface of the multi-relay 6.
Therefore, the wiring 10 for connecting the multi-relay 6 and the secondary terminal of the current transformer 4 and the wiring 11 for connecting the multi-relay 6 and the secondary terminal of the measuring transformer 5 are The control wiring 7 connected between the control auxiliary devices 8 is a wiring path separated so that the wiring is not parallel in the vicinity of the connection surfaces 6 a and 6 b for the multi-relay 6.

  By arranging the control auxiliary device 8 on the back surface of the multi-relay 6 as shown in FIG. 2, the space for arranging the control auxiliary device 8 can be reduced, and other devices are added to the reduced space. Etc. will be able to be used effectively. Further, by arranging the rear surface as shown in FIG. 2, the wiring 7 for connecting the multi-relay 6 and the auxiliary device 8 is connected to the secondary of the instrument transformer (the instrument current transformer 4 and the instrument transformer 5). The wiring path can be separated from the wirings 10 and 11 that connect the terminals and the multi-relay 6, and the wiring 7 that connects the multi-relay 6 and the auxiliary device 8 for control can be minimized. This can reduce wiring material costs. In addition, by using a dedicated cable in which the control wiring 7 is molded, it is possible to omit the wire-laying work and further reduce the processing cost.

The wiring 10 to which the multi-relay 6 and the secondary terminal of the instrument current transformer 4 are connected and the wiring 11 to which the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected to the multi-relay 6. When the connection surface is on the lower side, the control wiring 7 is connected to the lower side of the multi-relay 6 to separate the control wiring 7 and the wiring path from the control relay 7 for connecting the auxiliary device 8 for control. By adopting a configuration that is performed on other surfaces, it is possible to separate the wiring paths in the same manner.
Thus, the wiring 10 to which the multi-relay 6 and the secondary terminal of the instrument current transformer 4 are connected, the wiring 11 to which the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected, and the control In order to be able to separate the wiring paths of the wiring 7, the wiring 10 connecting the multi-relay 6 and the secondary terminal of the current transformer 4 and the secondary of the multi-relay 6 and the measuring transformer 5 are connected. By configuring the connection surface of the multi-relay 6 so that the connection surface 6a to which the wiring 11 connected to the terminal is connected and the connection surface 6b to which the control wiring 7 is connected are different surfaces, the wiring path Separation can be done.

  As described above, in the switchgear according to the first embodiment, the control auxiliary device 8 is disposed on the back surface of the multi-relay 6, and the connection surface of the control wiring 7 that connects the multi-relay 6 and the auxiliary device 8; Since the connection surfaces of the wirings 10 and 11 for connecting the secondary terminals of the instrument transformers 4 and 5 and the multi-relay 6 are different surfaces, the control wiring 7 connected to the multi-relay 6 and the instrument transformer Since the wiring paths with the secondary wirings 10 and 11 of 4 and 5 can be separated, surges that migrate from the secondary wirings 10 and 11 of the instrument transformer to the control wiring 7 can be suppressed. . Further, since the control auxiliary device 8 is arranged on the back surface of the multi-relay 6, the wire length of the control wiring 7 can be greatly shortened compared to the conventional case, so that the wiring material cost can be reduced. In addition, by using a dedicated cable in which the control wiring 7 is molded, it is possible to omit the wire-laying work and further reduce the processing cost.

Embodiment 2. FIG.
Next, the switchgear in Embodiment 2 of this invention is demonstrated based on FIG. FIG. 4 is a perspective view of the arrangement configuration of the control circuit, and corresponds to FIG. 2 of the first embodiment.
The switchgear according to Embodiment 2 of the present invention is movable with respect to the front door in a state in which the auxiliary device 8 for control is disposed on the back surface of the multi-relay 6. In FIG. 4, the same reference numerals as those in FIGS. 1 and 2 are the same or equivalent.

In FIG. 4, the mounting plate 15 is pivotally supported by one of a convex rear arrangement frame (second support frame) 13 by a shaft body 16 or the like. The control auxiliary device 8 is mounted and fixed on a rotatable mounting plate 15. In this way, the control auxiliary device 8 is mounted on the movable mounting plate 15 which can be rotated on the back surface of the multi-relay 6 . Although not shown, a fastener for detachably fixing the mounting plate 15 and the rear surface arranging frame (second support frame) 13 is provided at the free end of the mounting plate 15 opposite to the movable side. .
As shown in FIG. 4, by making the mounting plate 15 movable in a rotatable manner, even when the auxiliary device 8 for control is arranged on the back surface of the multi-relay 6, when the multi-relay 6 is connected, control auxiliary Since the device 8 can be opened and closed with the mounting plate 15 attached, the multi-relay 6 and the instrument current transformer 4 can be removed without removing the control wiring 7 connecting the multi-relay 6 and the control auxiliary device 8. It is possible to secure a work space for the wiring 10 to which the secondary terminal of the wiring and the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected.

In FIG. 4, the connection of the multi-relay 6 and the secondary terminal of the current transformer 4 is connected to the wiring 10 and the connection of the multi-relay 6 and the secondary terminal of the instrument transformer 5 to the multi-relay. When the operation is performed on the lower side of the multi relay 6, the control wiring 7 for connecting the multi relay 6 and the auxiliary device 8 is connected to the left side of the multi relay 6 and the auxiliary device 8. In the case of such a configuration, as shown in FIG. 4, a movable part is provided on the left side of the left convex rear placement frame (second support frame) 13 and the mounting plate 15, and the vertical direction is the axis. And However, when the position of the control wiring 7 with the multi-relay 6 is on the upper side of the multi-relay 6 and the auxiliary device 8, the movable portion may be configured with the horizontal direction as an axis.

Embodiment 3 FIG.
Next, the switchgear in Embodiment 3 of this invention is demonstrated based on FIG. FIG. 5 is a perspective view of the arrangement configuration of the control circuit, and corresponds to FIG. 2 of the first embodiment.
The switchgear according to Embodiment 3 of the present invention is slidably movable with respect to the front door in a state in which the auxiliary control device 8 is disposed on the back of the multi-relay 6. In FIG. 5, the same reference numerals as those in FIGS. 1 and 2 are the same or equivalent.

In FIG. 5, the rear surface arrangement frame (second support frame) 13 a is an L-shaped rear surface arrangement fixed to the upper and lower two instrument mounting frames (first support frame) 12 by fastening portions 14 such as screws. A long hole 13b is provided in the horizontal direction on the back surface of the L-shaped back surface arranging frame (second support frame) 13a. The mounting plate 15 is slidably movable along the long hole 13b. The control auxiliary device 8 is mounted and fixed on a slidable mounting plate 15. In this way, the control auxiliary device 8 is mounted on the movable mounting plate 15 on the back of the multi-relay 6 .

  As shown in FIG. 5, by making the mounting plate 15 slidably movable, even when the auxiliary device 8 for control is arranged on the back surface of the multi-relay 6, when performing the wiring work of the multi-relay 6, the auxiliary control device is used. Since the device 8 can be opened and closed with the mounting plate 15 attached, the multi-relay 6 and the instrument current transformer 4 can be removed without removing the control wiring 7 connecting the multi-relay 6 and the control auxiliary device 8. It is possible to secure a work space for the wiring 10 to which the secondary terminal of the wiring and the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected. That is, when connecting the wires 10 and 11 connected to the secondary terminals of the instrument transformers 4 and 5 to the multi-relay 6, the mounting plate 15 to which the auxiliary device 8 is fixed is slid to the left in the figure. A work space for wiring can be secured.

Embodiment 4 FIG.
Next, a switchgear according to Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view of the arrangement configuration of the control circuit, and corresponds to FIG. 2 of the first embodiment. 7 and 8 are diagrams for explaining a structure for shielding noise.
A switchgear according to Embodiment 4 of the present invention includes a multi-relay 6 and a control auxiliary device 8.
Is configured to shield from noise. 6 to 8, the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts.

  In FIG. 6, the mounting plate 15 is movably mounted on the rear surface arrangement frame (second support frame) 13 as in the second embodiment. The auxiliary device 8 for control is mounted on the inner surface of the mounting plate 15 so as to face the multi-relay 6. A shield panel 17 capable of electromagnetically shielding noise is attached to the upper and lower and left and right four sides of the convex rear frame (second support frame) 13 so as to surround the multi-relay 6 and the control auxiliary device 8. It has been. The mounting plate 15 is made of a material that can electromagnetically shield noise. Therefore, when the mounting plate 15 is closed, the multi-relay 6 and the control auxiliary device 8 are arranged in a space closed by the mounting plate 15 and the shield panel 17.

In order to enhance the noise shielding performance, the shield panel 17 arranged at the top and bottom of FIG. 6 and the movable mounting plate 15 are contacted from the upper and lower ends of the mounting plate 15 as shown in FIG. An extension 15a extending to the 17 side is provided. In addition, the contact between the rear arrangement frame (second support frame) 13 and the movable mounting plate 15 arranged on the left and right in FIG. 6 enlarges the contact portion as in the configuration shown in FIG.
In addition, the method of taking contact between the shield panel 17, the mounting plate 15, and the rear surface arrangement frame (second support frame) 13 is not limited to the above method, and any method can be used as long as noise can be electromagnetically shielded. But it ’s okay.

  In the configuration of FIG. 6, the wiring 7 that connects the multi-relay 6 and the control auxiliary device 8 is arranged in a space closed by the mounting plate 15 and the shield panel 17. The wiring 10 to which the multi-relay 6 and the secondary terminal of the instrument current transformer 4 are connected and the wiring 11 to which the multi-relay 6 and the secondary terminal of the instrument transformer 5 are connected are below the multi-relay 6. Are connected to the shield panel 17 disposed on the lower side, a connector (not shown) is provided, and the secondary relay 10 between the multi-relay 6 and the instrument transformers 4 and 5 through the connector, 11 is connected to keep the shield.

In the switchgear of the fourth embodiment, the periphery of the multi-relay 6 and the control auxiliary device 8 is surrounded by a shield panel 17 that can shield noise, and the movable mounting plate 15 is made of a material that can shield noise. , Noise entering from the outside can be shielded, and the reliability of the switchgear can be increased.
In FIG. 6, the shield panel 17 is fixed to the side surface of the rear arrangement frame (second support frame) 13 to form a housing, but the rear arrangement frame (second support frame) 13 can be shielded. It may be configured in a box body and cover the multi-relay 6 and the auxiliary device 8 for control in a lump. The mounting plate 15 may be a fixed type as shown in FIG. 2 instead of a movable type, and the shielded housing may cover the multi-relay 6 and the control auxiliary device 8 in a lump.

Embodiment 5 FIG.
Further, when the multi-relay 6 and the control auxiliary device 8 are surrounded by the shield panel 17 as shown in FIG. 6, it is more reliable if the shield panel 17 is provided with a heat dissipation slit. Will increase. At this time, the penetration of noise can be prevented by setting the hole diameter of the slit to be smaller than the half-wavelength of the target noise.

1: Box 2: Front door 3: Circuit breaker 4: Instrument current transformer (instrument transformer)
5: Transformer for instrument (transformer for instrument) 6: Multi-relay 6a, 6b: Connection surface 7: Wiring between multi-relay and auxiliary equipment 8: Auxiliary equipment for control 9a, 9b: Duct for wiring 10: For instrument Wiring between current transformer secondary terminal and multi-relay 11: Wiring between instrument transformer secondary terminal and multi-relay 12: Instrument mounting frame (first support frame)
13, 13a: Rear arrangement frame (second support frame) 13b: Long hole 14: Fastening portion 15: Mounting plate 16: Shaft body 17: Shield panel.

Claims (7)

  A multi-relay that is attached to the front door of the box that houses the circuit breaker and instrument transformer, and that integrates protection, measurement, display, and operation functions, and is placed on the back of this multi-relay and used in combination with the multi-relay. An auxiliary device for control, and a connection surface of the wiring connecting the multi-relay and the auxiliary device to the multi-relay, and a wiring connecting the instrument transformer and the multi-relay to the multi-relay Switch gear with different connection surface.   The switchgear according to claim 1, wherein a wiring path connecting the multi-relay and the auxiliary device and a wiring path connecting the instrument transformer and the multi-relay are separated.   3. The switchgear according to claim 1, wherein a part of the wiring connecting the secondary terminal of the instrument transformer and the multi-relay is housed in a wiring duct provided on the back surface of the front door. .   The switchgear according to any one of claims 1 to 3, wherein the auxiliary device is mounted on a mounting plate attached to a support frame fixed to the back side of the front door.   The switchgear according to claim 4, wherein the attachment plate is movably attached to the support frame.   The switchgear according to any one of claims 1 to 5, wherein the auxiliary device disposed on the back surface of the multi-relay is surrounded by a casing made of a material capable of electromagnetic shielding. .   The switchgear according to claim 6, wherein a slit is provided in the housing.

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