JP2008283733A - Metal closed type switchgear and its assembling method - Google Patents

Abstract

A metal closed switchgear that can be maintained and inspected at one location on the front side and can be reduced in installation area.
SOLUTION: A busbar 2 disposed at an intermediate portion in a vertical direction of a box body 1, and switches 5 and 13 in which vacuum valves 4 and 12 connected to the busbar 2 with a fixed main circuit are molded with an insulating material, The cable heads 7 and 15 from which the movable main circuit of the switches 5 and 13 is led out and the operation mechanisms 6 and 14 for opening and closing the switches 5 and 13 are provided. The cable heads 7 and 15 and the operation mechanisms 6 and 14 are arranged vertically symmetrically.
[Selection] Figure 1

Description

  The present invention relates to a metal closed switchgear that can be easily inspected and reduced in installation area, and an assembling method thereof.

This type of conventional metal closed type switchgear has an operation mechanism such as a circuit breaker housed in a box placed on the front side, a cable head etc. placed on the back side, and maintenance inspection on the front side and back side. Is to be done. Moreover, although the operation mechanism which opens and closes switching devices, such as a circuit breaker and a disconnecting switch molded with an epoxy resin, is arranged on the front side, each is arranged in a row on the floor side (for example, refer to Patent Document 1). .
JP 2003-333715 A (5th page, FIG. 1)

  The conventional metal closed switchgear described above has the following problems. Although maintenance and inspection of the operating mechanism can be performed on the front side of the box, the cable head and the like have to be performed on the back side, and maintenance and inspection are in two places on the front side and the back side. And work space had to be ensured in the front side and the back side, and the installation had restrictions, such as separating a box from the wall of an electric room.

  On the other hand, although circuit breakers, disconnectors, etc. are molded with epoxy resin to reduce the size, the outer shape of the operating mechanism is relatively large, and when these are stored together on the floor side, the box body It was getting bigger. As the box size increases, the installation area increases. For this reason, it has been desired that the box can be made slim so that the installation area can be reduced so that the characteristics of the molded and reduced electrical device can be exhibited, and that maintenance and inspection can be performed at one place on the front side.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a metal closed type switchgear that can be maintained and inspected at one place on the front side and can reduce the installation area, and an assembling method thereof.

  In order to achieve the above object, a metal closed switchgear according to the present invention is molded with a bus bar disposed at an intermediate portion in the vertical direction of a box and an insulating material to which a fixed main circuit is connected to the bus bar. A switch, a cable head from which a movable main circuit of the switch is derived, and an operation mechanism for opening and closing the switch, and the switch, the cable head, and the operation mechanism are vertically symmetrical with respect to the bus. It is characterized by the arrangement.

  According to the present invention, since the switch for two lines and the operation mechanism are arranged vertically in a vertical row with the bus line as a boundary, the box body is slim, the installation area can be reduced, and the front side It is possible to maintain and inspect switches, operating mechanisms and cables.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a metal closed switchgear according to a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. 1 is a side view showing the configuration of a metal closed switchgear according to a first embodiment of the present invention, and FIG. 2 is an electric circuit diagram including the metal closed switchgear according to the first embodiment of the present invention. .

  As shown in FIG. 1, the metal closed switchgear that constitutes the electric circuit of FIG. 2 is vertically symmetrical with respect to a bus bar (BUS) 2 that is horizontally disposed in the middle part of the metal box 1 in the vertical direction. The first electric device portion 3a on the upper side in the drawing and the second electric device portion 3b on the lower side in the drawing are arranged separately.

  The first electric device section 3a is provided with a circuit breaker (CB1) 5 in which a vacuum valve 4 having a pair of contactable and separable contacts is molded with an insulating material such as epoxy resin. On the movable side of the vacuum valve 4 in the axial direction, an operation mechanism 6 such as an electromagnetic actuator for opening and closing the vacuum valve 4 is provided on the ceiling side. The movable main circuit protrudes from the front side perpendicular to the axial direction of the vacuum valve 4 and is led out by a cable head (CH1) 7 molded integrally with the vacuum valve 4. Further, a ground switch (ES1) 8 for grounding the movable main circuit is provided.

  A T-shaped cable 9 is interfaced with the cable head 7. At the base of the cable head 7, a detection device 10 for detecting the voltage or current of the movable main circuit composed of a through-type current transformer or an electrostatic coupling type transformer is attached.

  On the fixed side of the vacuum valve 4, as with the movable side, a detection device 11 that detects the voltage or current of the fixed-side main circuit is attached. By attaching the detection device 11 and the detection device 10 to at least one of them, the voltage and current of the main circuit, that is, power can be detected. In addition, the fixed side main circuit of each phase is interface-connected via a flexible material to the bus 2 in which three phases are arranged in a horizontal row, and connected to other boards. The bus bar 2 is molded with an insulating material.

  Similarly to the first electric device unit 3a, the second electric device unit 3b is provided with a circuit breaker (CB2) 13 in which the vacuum valve 12 is molded with an insulating material. On the movable side of the vacuum valve 12, an operation mechanism 14 for opening and closing the vacuum valve 12 is provided on the floor surface side. The movable main circuit is led out by a cable head (CH 2) 15 molded integrally with the vacuum valve 12. Further, a ground switch (ES2) 16 for grounding the movable side main circuit is provided. The ground switches 8 and 16 may be omitted in the electric circuit.

  A T-shaped cable 17 is interfaced with the cable head 15, and a detection device 18 for detecting the voltage or current of the movable main circuit is attached. A detection device 19 for detecting the voltage or current of the fixed main circuit is attached to the fixed side of the vacuum valve 12, and each phase is connected to the bus 2 in which three phases are arranged in a horizontal row. A front door 20 that can be opened and closed is provided on the front side of the box 1.

  As a result, the first electric device unit 3a and the second electric device unit 3b are arranged in a vertical row with the bus bar 2 as a boundary, and the operation mechanism 6 of the first electric device unit 3a is on the ceiling side, and the second electric device unit 3a Since the operation mechanism 14 of the device unit 3b is arranged on the floor surface side, the box 1 is slim and the installation area can be reduced. In particular, in the metal closed type switchgear that constitutes a large number of lines, a large number of boxes 1 are arranged in a row, but if two lines are combined into a single box 1 and these are arranged, the installation area can be greatly reduced. Can do.

  In addition, since the operation mechanisms 6 and 14, the circuit breakers 5 and 13, the cables 9 and 17, etc. are arranged on the front side, the maintenance and inspection of these electric devices are performed by opening the front door 20. Can do. Maintenance space on the back side is not required.

  On the other hand, in assembling, the operation mechanisms 6 and 14 and the detection devices 10, 11, 18, and 19 are attached to the molded vacuum valves 4 and 12 outside the box 1, respectively, and the first electric device unit 3a and the second The electrical equipment part 3b is temporarily assembled. And after attaching the bus-bar 2 to the box 1, the 1st electric equipment part 3a is built in, and then the 2nd electric equipment part 3b which turned the 1st electric equipment part 3a upside down is built in. The order of incorporating the first electric device unit 3a and the second electric device unit 3b may be either.

  Thereby, the assembly work of the 1st electric equipment part 3a and the 2nd electric equipment part 3b accommodated in the box 1 is easy, and it becomes a short time. Moreover, since the cable heads 7 and 15 are located on the front side, the connection work of the cables 9 and 17 is facilitated.

  According to the metal closed type switchgear of the first embodiment, the circuit breakers 5 and 13 and the operation mechanisms 6 and 14 for two lines are arranged vertically in a vertically symmetric arrangement with respect to the intermediate bus 2. The body 1 becomes slim and the installation area can be reduced. In addition, by opening the front door 20, it is possible to perform maintenance and inspection of electrical devices such as the operation mechanisms 6 and 14, the circuit breakers 5 and 13, and the cables 9 and 17.

  In the first embodiment, the electric device has been described with the circuit breakers 5 and 13. However, the electric circuit can be replaced with a disconnector that reliably opens the main circuit. The disconnector and the circuit breakers 5 and 13 are combined to form a switch that opens and closes the main circuit. The first electrical device unit 3a side is the first switch and the second electrical device unit 3b side is the second switch. It is called a vessel.

  Next, a metal closed switchgear according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a side view showing the configuration of the metal closed switchgear according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in the arrangement of the operation mechanism. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, in the first electric device section 3 a, the operation mechanism 21 is disposed on the ceiling side of the back surface of the circuit breaker 5, and in the second electric device section 3 b, the operation mechanism 22 is disposed on the back surface of the circuit breaker 13. It is arranged on the floor side. The circuit breakers 5 and 13 and the operation mechanisms 21 and 22 are connected by connecting levers 23 and 24. The connecting levers 23 and 24 are a part of the operation mechanisms 21 and 22. When the front door 20 is opened, maintenance and inspection of main parts such as a rotating part requiring lubrication can be performed. The operating mechanisms 21 and 22 that do not need to be lubricated frequently are located on the back side.

  According to the metal closed switchgear of the second embodiment, in addition to the effects of the first embodiment, the operation mechanisms 21 and 22 connected by the connecting levers 23 and 24 are arranged on the back side. The height can be reduced.

The side view which shows the structure of the metal closed type switchgear which concerns on Example 1 of this invention. The electric circuit diagram comprised with the metal closed type switchgear which concerns on Example 1 of this invention. The side view which shows the structure of the metal closed type switchgear which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box body 2 Bus 3a 1st electric equipment part 3b 2nd electric equipment part 4, 12 Vacuum valve 5, 13 Circuit breaker 6, 14, 21, 22 Operation mechanism 7, 15 Cable head 8, 16 Ground switch 9 , 17 Cable 10, 11, 18, 19 Detection device 20 Front door 23, 24 Connecting lever

Claims (6)

A bus arranged in the middle of the box in the vertical direction;
A switch molded of an insulating material to which a fixed main circuit is connected to the bus;
A cable head from which the movable main circuit of the switch is derived;
An operation mechanism for opening and closing the switch,
A metal closed switchgear characterized in that the switch, the cable head, and the operation mechanism are arranged vertically symmetrically with respect to the bus.   2. The metal closed switchgear according to claim 1, wherein the cable head is arranged on a front side, and the switches and the operation mechanism are arranged in a vertical row.   2. The metal closed switchgear according to claim 1, wherein the cable head is disposed on the front side, the operation mechanism is disposed on the back side, and the switch is coupled to the switch by a coupling lever.   The metal closure according to any one of claims 1 to 3, wherein a detection device for detecting power of the main circuit is provided in at least one of the fixed-side main circuit and the cable head of the switch. Switch gear.   5. The metal closed switchgear according to claim 1, wherein the switch is a circuit breaker formed of a vacuum valve having a pair of contactable and separable contacts. An operation mechanism is attached to each of the first switch and the second switch molded with an insulating material,
A busbar is attached to an intermediate portion in the vertical direction of the box that houses the first switch and the second switch,
With the busbar as a boundary, the first switch is incorporated in one of the vertical directions of the box and connected to the busbar,
On the other hand, the second switch is incorporated and connected to the bus,
An assembly method of a metal closed switchgear, wherein the first switch and the second switch are arranged symmetrically in the vertical direction.

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