JPH04275005A - Grounding circuit switchgear of enclosed switchboard - Google Patents

Abstract

PURPOSE:To close a grounding circuit switchgear for meggering of the insulation resistance of the load line of an enclosed switchboard in which a drawer type breaker is housed only by drawing out the breaker to a disconnecting position. CONSTITUTION:A grounding circuit is switched in such a manner that the grounding circuit is closed by a movable contactor 7 which is attached to a shutter mechanism 3 shielding the front charging part of a fixed contact part 1b separated from a movable contact part following the drawing out a breaker 1 and a fixed contactor 5 composed of a spring material connected to the rear of a load side fixed contact part with a load side wiring 4.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] This invention relates to the grounding circuit of a megger ring for measuring the insulation resistance of a load circuit consisting of a power supply cable, a motor, a transformer, etc. in a closed distribution board housing a draw-out circuit breaker, when the circuit breaker is placed at the disconnection position. The present invention relates to a grounding circuit switchgear which is constructed by closing a circuit simply by pulling it out, and in which contacts can be easily assembled and installed without the need for adjustment.

0002

[Prior Art] A megger ring grounding circuit switching device for measuring the insulation resistance of a load circuit in a closed switchboard housing a draw-out circuit breaker generally adjusts the contact pressure between the contact and the load circuit using a spring or the like. The ground circuit was constructed by being closed at, for example, an outlet section attached to the front surface of the panel body frame (for example, see Japanese Patent Laid-Open No. 53-4831).

0003

[Problems to be Solved by the Invention] With the above structure, the contact portion between the contactor and the load circuit is located in a deep and narrow place inside the panel, which not only makes it difficult to adjust the contact pressure, but also makes it difficult to adjust the contact pressure. This had the disadvantage that the number of wiring inside the panel increased because it was installed on the front of the panel, which required a lot of work to assemble.

[0004] In order to eliminate the above-mentioned drawbacks, the present invention
An object of the present invention is to provide a grounding circuit switchgear for a closed switchboard, which can be easily assembled and provided without adjusting contacts.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention stores a drawer-type circuit breaker 1 in a distribution board, fixedly supports it with a support plate 2 in the panel, and attaches it to the drawer of the circuit breaker 1. Accordingly, in a closed switchboard in which the movable contact part 1a and the separated front live part of the fixed contact part 1b are shielded by a shutter 3 that is linked to the drawing operation of the circuit breaker 1, the grounding circuit of the load power line is connected to the load side fixed contact part 1b. A fixed contact 5 made of a spring material is connected to the back side together with the load side wiring 4, and a movable contact 7 is attached to the operating lever 6 of the shutter mechanism. When the circuit breaker 1 is pulled out, the circuit breaker 1 can be closed and opened/closed. .

[0006]

[Operation] A fixed contact 5 made of a spring material that supports the grounding circuit on the support plate 2 via the fixed contact portion 1b, and a movable contact attached to the operating lever 6 of the shutter mechanism that is linked to the drawing operation of the circuit breaker 1. 7, the circuit breaker 1 can be closed and opened/closed simply by pulling it out to the disconnected position, thereby eliminating the need for contactor adjustment work as described in the prior art, and making assembly work easier.

[0007]

Embodiment FIG. 1 shows an embodiment of the present invention. This figure shows a drawer-type circuit breaker 1 housed in a switchboard and pulled out to the disconnection position, with a fixed contact section facing the movable contact section 1a separated from the movable contact section 1a as the circuit breaker 1 is pulled out. 1b is fixedly supported by a support plate 2 in the panel via an insulating bushing 8, and the front charging portion of this fixed contact portion 1b is shielded by a shutter 3 that is linked to the drawing operation of the circuit breaker 1. This shutter 3 is connected to the support plate 2.
It is attached to a rail 9 made of an insulating material that is engaged with and supported movably in the vertical direction, and a drive lever 10 is rotatably coupled at one end of the rail 9 at a suitable intermediate position. This drive lever 10 is rotatably supported on the inner surface of the panel with the other end as a fulcrum 11, and the upper surface of a rod-shaped striker 13 in the drawing direction attached to the side surface of the circuit breaker 1 via a roller 12 provided near the fulcrum 11. is supported by The figure shows the roller 12 descending along the slope formed on the upper surface of one end of the striker 13.
2, the rail 9 connected to one end of the drive lever 10 moves downward, so that the shutter 3 shields the charging portion on the front surface of the fixed contact portion 1b.

The earthing circuit switching device of the megger ring for measuring the insulation resistance of the load circuit in the switchboard has a fixed contact portion 1 on the load side.
A fixed contact 5 made of a plate spring material is electrically connected to the back side of the load side wiring 4 along with the load side wiring 4, and a movable contact 7 is attached to one end of an operating lever 6 rotatably supported around a support shaft 14. It consists of The operating lever 6 is rotatably connected to a drive lever 10 of the shutter mechanism at the other end, and when the circuit breaker 1 is pulled out, by pushing down the other end, the movable contact 7 at one end is moved as shown in FIG. The grounding circuit is closed by contacting the fixed contactor 5 at the same time. In this state, the power supply is cut off, so the insulation resistance of the load circuit can be safely measured with an appropriate megger. In order to start power supply from this state, when the circuit breaker 1 is pushed in as shown in FIG. 2, the roller 12 of the shutter mechanism rolls on the upper surface of the striker 13 on the side of the circuit breaker, and one end of the drive lever 10 moves upward. As a result, the shutter 3 moves upward and opens the charged part on the front surface of the fixed contact part 1b, thereby allowing the movable contact part 1a to close with the movable contact part 1a and energize. By pulling it up, the movable contact 7 attached to one end can be separated from the fixed contact 5 by a sufficient insulation distance, thereby opening the ground circuit.

According to the embodiment, a grounding circuit is connected via the fixed contact portion 1b to the fixed contact 5 made of a spring material supported by the support plate 2 and the operating lever 6 of the shutter mechanism that is linked to the drawing operation of the circuit breaker 1. Since the circuit breaker 1 can be closed and opened/closed by simply pulling the circuit breaker 1 to the disconnected position with the attached movable contact 7, the adjustment work of the contact described in the conventional technology is not required, and the assembly work is also facilitated. can.

In the above embodiment, the fixed contact 5 of the switchgear is made of a spring material, but the movable contact 7
There is no problem even if it is made of spring material.

[0011]

[Effects of the Invention] According to the present invention, when the circuit breaker of a closed switchboard housing a drawer-type circuit breaker is pulled out, the front live part of the fixed contact part that is separated from the movable contact part is linked with the drawing operation of the circuit breaker. For shielding with a shutter, the grounding circuit switching device of the mega ring for measuring the insulation resistance of the load circuit is attached to the fixed contact made of a spring material supported by a support plate and the operating lever of the shutter mechanism via the fixed contact part on the load side. Since the circuit breaker is configured with a movable contactor that closes the circuit when the circuit breaker is pulled out, the grounding circuit can be closed and the insulation resistance of the load circuit can be measured by simply pulling the circuit breaker to the disconnected position. In addition, it is possible to eliminate the need for adjusting the contact pressure between the fixed contact and the movable contact, and to simplify the assembly work.

[Brief explanation of the drawing]

[Fig. 1] Side view of main parts of an embodiment of the present invention

[Figure 2] Side view of main parts of the breaker in Figure 1 in energized state

[Explanation of symbols]

1. Circuit breaker 1a Movable contact part 1b Fixed contact part 2 Support plate 3 Shutter 4 Wiring 5 Fixed contact 6 Operation lever 7 Movable contact

Claims (1)

[Claims] Claim 1: A drawer-type circuit breaker is housed in a distribution board, fixedly supported by a support plate in the panel, and a front charging part of a fixed contact part separated from a movable contact part is connected to the circuit breaker. In a closed switchboard that is shielded by a shutter that is linked to the pull-out operation, the grounding circuit of the load cable is attached to the fixed contact made of a spring material connected to the back of the load-side fixed contact part along with the load-side wiring, and to the operating lever of the shutter mechanism. A grounding circuit switching device for a closed power distribution board, characterized in that the circuit can be opened and closed by closing the circuit when a circuit breaker is pulled out using a movable contactor.