JPS6392206A - Interlocking apparatus of manual actuator of disconnector and so forth - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to Which the Invention Pertains] The present invention relates to an interlock device for manual operating devices such as disconnectors and earthing switches of power distribution boards.

[Prior art and its problems]

Manual operating devices such as disconnectors on power distribution boards are generally provided with an interlock that prevents them from being operated when the circuit breaker is turned on and allows operation only when the circuit breaker is turned off. The interlock device usually uses a solenoid to lock the shutter that opens and closes the handle insertion port of the operating device when the shutter is interlocked, and releases the lock by energizing an interlock release solenoid. Therefore, since the solenoid is constantly energized when the interlock is released, consideration must be given to preventing the solenoid from burning out.

FIGS. 3 and 4 show a conventional manual operating device interlock device. A shutter 3 is vertically movably attached to a guide plate 5 fixed to a partition wall plate 4 in the panel through an elongated hole 51 on the front surface of an operating shaft 2 of a disconnector or the like of a switchboard 1. Further, a solenoid 7 is attached to the upper part of the partition wall plate 4, which is engaged with a rotating arm 61 of a cylinder lock 6 fixed to the partition wall plate 4. A closing plate 8 is rotatably attached. When the solenoid 7 is not energized, the closing plate 8 moves downward and its tip closes the key hole of the cylinder lock 6, but when the solenoid 7 is energized, it is attracted to the solenoid 7 and its tip opens the key hole. ing. A switch and a chiro 2 are integrally attached to the cylinder lock 6.

When the operating shaft 2 is interlocked, the solenoid 7 is not energized and the closing plate 8 is lowered, making it impossible to insert the key into the cylinder lock 7.
The shutter 3 is lowered and prevents the handle from being inserted, but when the interlock condition is released, the solenoid 7 is energized and the closing plate 8 is attracted and pulled up, so operate the cylinder lock 6 with the key and boom. The shutter 3 is rotated and the shutter 3 is pulled up, and a handle is inserted into the operating shaft 2 to enable the operation of a disconnector, etc.

This interlock device has a complicated structure and requires a special tool such as a key, and has the disadvantage that the solenoid is continuously energized when the interlock is released, which may cause the coil to burn out.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, and provides an interlock device for a manual operating device such as a disconnector, which has a simple structure and prevents coil burnout by limiting the energization of the solenoid only during operation of the disconnector, etc. With the goal.

[Key points of the invention]

The present invention includes a shutter that manually opens and closes the handle insertion port on the front side of the operating shaft of a disconnector, etc., a solenoid that locks the shutter in the closed position under interlock conditions, and a selector switch in the excitation circuit of this solenoid. The purpose is to limit the excitation of the solenoid only to when a disconnector or the like is being operated by interposing the solenoid so that the solenoid will not be energized unless the selector switch is turned on even if the interlock release conditions are met.

[Embodiments of the invention]

1 and 2 show an interlock device for a manual operating device such as a disconnector according to an embodiment of the present invention, and parts indicated by the same reference numerals as in FIGS. 3 and 4 are the same parts. The operating shaft 2 of a disconnector, etc. is a threaded rod that is rotated by a nozzle 9, and 21 is a slider that is screwed into the threaded rod.
When it is attached to the operating shaft 2 and rotated, the slider 21 moves linearly to disconnect the disconnector. A shutter 12 is inserted between a guide plate 11 fixed inside a handle insertion port 10 provided on the front side of a power distribution board 1 and a surface plate of the board so as to be vertically movable by hand. Above the shutter 12 is a solenoid 13 that locks the shutter in the closed position.
is installed. When the solenoid 13 is not energized, a plunger 131 is pushed by a spring 132 and protrudes, and this plunger 131 engages with the upper end of the shutter 12 when closed, but when energized, the plunger 131 retracts and the shutter 12 can be lifted by hand. The handle insertion slot can be opened. 14 is a selector switch installed on the board,
The selector switch 14 is connected in series to the excitation circuit of the solenoid.

15 is a name plate indicating the importance of disconnectors, etc. Plunger 13
It is attached to cover the front of 1. A pad 16 locks the shutter 12 to a fixed portion when closed. 17
1 is a terminal block, and 18 is a connecting wire.

When the operating device is interlocked, the solenoid 13 is not energized, the plunger 131 locks the shutter 12, and the handle insertion port 10 cannot be opened, so that no operation can be performed. When the interlock condition is released, the solenoid is energized, but
Since the selector switch 14 is installed above the solenoid, the solenoid 13 is excited only when the selector switch 14 is turned on, and the shutter 12 can be opened and operated. When the operation is completed, be sure to turn off the selector switch 14. Since the selector switch 14 is provided with an auxiliary contact, the lamp can be turned on by the auxiliary contact to alert the user to avoid forgetting to turn off the selector switch. If it is necessary to forcibly de-energize the solenoid due to a power outage, etc., open the name plate 15 and press the plunger 13.
The shutter 12 can be pulled up by pushing 1 with a screwdriver or the like. In that case, the selector switch must be turned ON and then turned OFF after the operation of the operating axis is completed.

[Effects of the Invention] According to the present invention, by placing a selector switch above the solenoid, it is possible to prevent the solenoid from being energized for a long time, and the solenoid can be made smaller and have a longer life.
By putting in the effort of operating the selector switch, you can prevent erroneous operations caused by vague operations. Further, since no special tools such as keys are required and the structure is simplified, the cost can be reduced and reliability can be improved.

[Brief explanation of the drawing]

Figure 1 is a front view of an interlock device for a manual operating device such as a disconnector according to an embodiment of the present invention, Figure 2 is a side view of Figure 1, and Figure 3 is a side view of Figure 1.
The figure is a front view of a conventional interlock device for a manual operating device, and FIG. 4 is a side view of figure g3. 1: Switchboard, 2: Operating shaft, 9: Handle, 10: Handle insertion slot, 11 Guide plate, 12: Shaft. 13: Solenoid, 14: Selector switch, 15
: Nameplate, 16: Padlock, 17: Spore stand, 18: Connection wire, 21 Nislider, 131 Nibranger, 132
:Spring◇ Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1) In an interlock device in which a shutter for opening and closing a handle insertion port of a manual operating device is locked by a solenoid according to interlock conditions, a disconnection characterized in that a selector switch is connected in series to the excitation circuit of the solenoid. Interlock device for manual operating devices such as instruments.