JP2009171774A - Shielding device of switch gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shielding device of a switch gear that unfailingly prevents an operator from contacting fixed contact terminals and is installed at comparatively low costs. <P>SOLUTION: The shielding device 30 of a switch gear includes a leading breaker stored in a storing chamber of a box body so as to be led out and having movable contact terminals connected to fixed contact terminals of a main circuit. In the shielding device 30, a shielding plate 32 made of an insulative material is provided upright on a carriage 31, and the leading breaker is stored in the storing chamber when being led to the outside of the storing chamber, so that the fixed contact terminals can be sealed with the shielding plate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shielding device used during maintenance / inspection of a switchgear having a drawer circuit breaker.

  2. Description of the Related Art A switchgear having a drawer type circuit breaker is known as a device that shuts off a power supply system when stopping operation of various devices in a power plant or the like. The switchgear stores a drawer type circuit breaker having a movable contact terminal in a storage chamber inside the box, and connects the movable contact terminal of the drawer type circuit breaker with the fixed contact terminal of the main circuit protruding into the storage chamber. The system is connected. When performing maintenance / inspection, the drawer-type circuit breaker is pulled out of the storage chamber, and the movable contact terminal and the fixed contact terminal are separated from each other to be opened.

  Here, when carrying out maintenance and inspection by pulling out the drawer type circuit breaker from the storage room, the fixed contact terminal is exposed in the storage room. There is a risk of accidents such as electric shock coming into contact. For this reason, for example, there is one that opens and closes a shutter that is provided to face a fixed contact terminal in accordance with the withdrawal of the drawer-type circuit breaker (for example, Patent Document 1).

JP 2002-335610 A

  By adopting such a shutter mechanism, the fixed contact terminal is blocked by the shutter during maintenance / inspection work, so that it is possible to reliably prevent accidents such as an operator touching the fixed contact terminal and receiving an electric shock. I can. However, the mechanism is complicated, and it is difficult to adopt it for existing facilities, and there is also a problem that enormous capital investment is newly required to adopt such a mechanism.

  The present invention has been made in view of such circumstances, and provides a switchgear shielding device that can reliably prevent an operator from coming into contact with a fixed contact terminal and that can be installed relatively inexpensively. For the purpose.

  The present invention that solves the above-mentioned problems is a switchgear interrupting device comprising a drawer type circuit breaker having a movable contact terminal that is retractably stored in a box storage chamber and connected to a fixed contact terminal of a main circuit. And a shielding plate made of an insulating material is erected on the carriage, and when the drawer type circuit breaker is pulled out of the storage chamber, it is stored in the storage chamber and the fixed contact terminal is blocked by the shielding plate. The switchgear shielding device is characterized by the above.

  Moreover, it is preferable that the said shielding board has a magnitude | size which plugs up the substantially whole surface where the said fixed contact terminal of the said storage chamber is provided.

  In the present invention, since the fixed contact terminal is reliably shielded by the shielding plate, it is possible to reliably prevent an accident such as an electric shock caused by contact with the fixed contact terminal from the outside. Moreover, since the shielding apparatus does not need to change an existing installation and does not require a huge capital investment, it can be adopted relatively easily.

Hereinafter, the present invention will be described in detail based on embodiments.
FIG. 1 is a side view showing an example of a switchgear, and FIG. 2 is a schematic perspective view of a shielding device according to the present invention. Moreover, FIG. 3 is a figure which shows the outline of the usage procedure of a shielding apparatus.

  As shown in FIG. 1, the switchgear 10 is used, for example, in a power generating / transforming facility or the like, and is stored in a box 11 provided with a switchboard (main circuit), and a storage chamber 12 of the box 11. And a drawer type circuit breaker (breaker) 13. The drawer-type circuit breaker (breaker) 13 has a circuit breaker body 14 fixed on a carriage 15 and can move linearly on a rail 16 provided on the bottom surface 12 a of the storage chamber 12. The circuit breaker body 14 is a so-called vacuum circuit breaker, which utilizes the arc extinguishing force and insulation performance of an excellent vacuum. Since the arc generated at the time of opening is diffused at high speed in a vacuum, it is easy. Has an advantage that a large current can be cut off.

  During operation of the power generation and substation equipment, the draw-out type circuit breaker (breaker) 13 is pushed into the storage chamber 12 of the box 11 and the circuit breaker body 14 is connected to the main circuit. In this case, a draw-out type circuit breaker (breaker) 13 is pulled out from the storage chamber 12 to the outside of the box 11 so that the circuit breaker body 14 is opened with the main circuit.

  Specifically, the fixed contact terminal 17 connected to the main circuit is provided on the rear surface 11 a side of the box 11 so as to protrude in the storage chamber 12 in a substantially horizontal direction. For example, a plurality of fixed contact terminals 17 connected to the three-phase buses of the main circuit are provided. A cylindrical protective cover 18 made of an insulating material is provided around each fixed contact terminal 17 protruding into the storage chamber 12, and each fixed contact terminal 17 is protected by this protective cover 18. (See FIG. 3A). On the other hand, a plurality of movable contact terminals 19 corresponding to each fixed contact terminal 17 are provided on the rear surface side of the circuit breaker body 14, that is, the surface facing the fixed contact terminal 17 so as to protrude in a substantially horizontal direction. A cylindrical protective cover 18 made of an insulating material is also provided around each movable contact terminal 19 in the same manner as the periphery of the fixed contact terminal 17. The breaker body 14 is stored in the storage chamber 12 so that the movable contact terminal 19 is connected to the fixed contact terminal 17, and the movable contact terminal 19 is released from the fixed contact terminal 17 by being pulled out of the storage chamber 12. It has become so.

  Such maintenance / inspection work of the switchgear 10 is performed with the circuit breaker main body 14 pulled out from the storage chamber 12 to the outside of the box 11. At this time, the fixed contact terminal 17 is exposed in the storage chamber 12. If this is the case, there is a risk that an accident such as an electric shock caused by an operator coming into contact with the fixed contact terminal 17 may occur. For this reason, in the present invention, when the circuit breaker body 14 is pulled out from the storage chamber 12, the following shielding device 30 is stored in the storage chamber 12, thereby closing the fixed contact terminal 17 and fixing the operator. Accidents such as electric shock due to contact with the contact terminal 17 are prevented in advance.

  As shown in FIG. 2, the shielding apparatus of the present invention has a shielding plate 32 erected on a carriage 31. In the present embodiment, the shielding plate 32 is erected in the vicinity of one end in the moving direction of the carriage. And the shielding apparatus 30 can move linearly on the rail 16 provided in the bottom face 12a of the storage chamber 12, like the carriage 15 of the circuit breaker body 14. The shielding plate 32 is made of an insulating material so that it does not conduct when the shielding plate 32 contacts the fixed contact terminal 17. That is, the shielding plate 32 made of an insulating material includes not only the whole made of an insulating material but also the one made only of the surface of the insulating material. Moreover, the magnitude | size and shape of the shielding board 32 will not be specifically limited if it is a magnitude | size and shape which can block at least each fixed contact terminal 17. FIG. For example, in the present embodiment, the shielding plate 32 has a size that covers the entire rear surface of the storage chamber 12. That is, the shielding plate 32 has such a size that an operator's hand does not enter from the gap between the side surface or the upper surface of the storage chamber 12.

  Such a shielding device 30 is used in the following procedure in maintenance / inspection work of the switchgear 10. First, the circuit breaker body 14 is moved along the rail 16 from the state in which the circuit breaker body 14 is stored in the storage chamber 12, that is, the so-called circuit breaker operating state, as shown in FIG. As shown in b), the circuit breaker body 14 is pulled out from the storage chamber 12 to the outside of the box 11. Thereafter, as shown in FIG. 3C, the shielding device 30 is disposed on the rail 16 and stored in the storage chamber 12 from the shielding plate 32 side. Then, in a state where the shielding device 30 is stored in the storage chamber 12, the operator performs various inspection / maintenance operations of the switch gear 10.

  By storing the shielding device 30 in the storage chamber 12 in this way, the rear surface side of the storage chamber 12, that is, the surface provided with the fixed contact terminal 17 is blocked by the shielding plate 32 of the shielding device 30. During maintenance / inspection work, an accident such as an electric shock caused by an operator touching the fixed contact terminal 17 does not occur, and the safety of the work is greatly improved. Moreover, since the shielding apparatus 30 of the present invention can be employed in an existing apparatus and does not require a complicated mechanism, capital investment can be suppressed.

  As mentioned above, although one Embodiment of this invention was described, it cannot be overemphasized that a various change is possible for this invention in the range which is not limited to this Embodiment and does not deviate from the summary.

It is a side view which shows an example of a switchgear. It is a schematic perspective view of the shielding apparatus which concerns on this invention. It is a figure which shows the use procedure of the shielding apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Switch gear 11 Box 12 Storage chamber 13 Pull-out type circuit breaker 14 Circuit breaker main body 16 Rail 17 Fixed contact terminal 18 Protective cover 19 Movable contact terminal 30 Shielding device 31 Carriage 32 Shielding plate

Claims (2)

A switchgear circuit breaker comprising a drawer type circuit breaker having a movable contact terminal that is retractably stored in a box storage chamber and connected to a fixed contact terminal of a main circuit,
A shielding plate made of an insulating material is erected on the carriage, and when the drawer type circuit breaker is pulled out of the storage chamber, it is stored in the storage chamber and the fixed contact terminal is blocked by the shielding plate. A switchgear shielding device characterized by the above.   2. The switchgear shielding device according to claim 1, wherein the shielding plate has a size that covers substantially the entire surface of the storage chamber on which the fixed contact terminal is provided.

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