JPS62281707A - Interlocking apparatus for switchboard - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention The present invention consists of a large fixed circuit breaker (OB) and an electrically operated disconnector (DS) connected to the OB. and a manually operated earthing switch (aS) for grounding the connection end of the OE.

(Prior art and its problems) FIG. 6 shows a main circuit diagram of this type of general switchboard. The circuit breaker OB is fixedly installed in the panel and is connected to the power source and the load side via a disconnector (DS) operated by the electric motor M. A grounding switch (GS) is connected to the input and output terminals of the circuit breaker (CB). The earthing switch is provided to maintain safety during maintenance and inspection of the circuit breaker.

When driving, DS and OB are turned ON, but at that time GS must be OFF, and DS can only be turned ON or OFF after CB is turned OFF, and GS must be turned ON only when DS is OFF. An interlock must be provided to prevent the DS from being operated when Gs is ON. In addition, the electrically operated D
Since S is provided with an auxiliary manual operation mechanism to enable operation even if the electric motor is in trouble, an interlock with this auxiliary manual operation device must also be considered.

Conventionally, an electrical interlock was provided between the operating motor circuit of the DS and the trip circuit of the OB, so that the DS could not be operated unless the OB was turned off, and a limit switch was installed at the handle attachment part of the operating shaft of the GS. Attach the G
At the time of S operation, operation of the DS operation motor was prevented.

However, electrical interlocks have problems such as poor contact and are low in reliability, and also have the disadvantage that the interlocks for auxiliary manual operation of the DS are not sufficient.

(Objective of the Invention) An object of the present invention is to eliminate the above-mentioned drawbacks and provide a complete and highly reliable interlock device for a switchboard.

(Summary of the Invention) The present invention includes a locking plate for key interlocking with OB and GS on the front of the DS operating device, which is attached to the operating shaft of the DS so as to perform linear movement via a link lever. A shutter plate is provided on the front of the manual handle mounting shaft to interlock with the operating motor of OB and DS via a solenoid and a limit switch, and a locking plate is provided on the front of the end of the GS operating shaft to interlock with the DS. is attached to this operating shaft via a link lever so as to perform linear movement.

(Embodiment of the Invention) Figure 1 shows a disconnector operating device provided with an interlock according to an embodiment of the present invention. 1 is a disconnector operating device, and a motor 2
The disconnector operating shaft 3 is rotated to open and close the DS, but
It is also possible to insert a handle into the spindle 4 and rotate the operating shaft 3 manually. Reference numeral 5 designates a locking plate that is connected to the operating shaft 3 via a link lever 6 and is moved linearly up and down, and the locking plate 5 has a hole that engages a rod of a latch lock 7 that interlocks with OE and GS using a key. ). A shutter 8 is installed in front of the manually operated spindle 4.
A solenoid 9 is attached to the shutter 8 so as to be movable up and down, and is engaged with a solenoid 9 which is excited when the OE is turned OFF to recess the rod and release the engagement when the OE is turned OFF. Further, when the shutter 8 is turned off, the shutter 8 can be lifted to attach the handle, but in this state, the IJ Mitswitch 10 is operated to turn off the electric operation circuit of the motor 2. In the state shown in Figure 1, DS is O.
A key that indicates the N time and can be removed by turning off each latch lock provided on the OB and GS operating devices is attached to the latch lock 7 by recessing the rod, and in this state the key is removed from the latch lock 7. Cannot be removed, therefore C! B,
GS cannot be operated.

FIG. 2 shows an operating device for a grounding switch equipped with an interlock according to an embodiment of the present invention, in which a locking plate 13 is attached to a movable nut 12 that is screwed into a threaded portion of an operating shaft 11.
is mounted so that it can be moved in the axial direction via a lever 14, and this locking lever L, -
! A hole is provided for engaging the rod of the latch lock 15. 16
is an aS opening/closing instruction device that is linked to the moving nut 12. The state shown in FIG. 2 shows the GS (7) 0I11 time, in which the rod of the latch lock 15 protrudes and engages with the locking plate 13, and the key has been removed, so the GS cannot be operated.

Figure 3 shows the interlock device of the disconnector operator during auxiliary manual operation.Since OB is OFF, the solenoid 9 is energized and its rod is recessed, and the shutter 8 is lifted and the handle is turned off. Manual operation is possible by inserting 17. When the shutter 8 is pushed up, a limit switch 10 is operated to cut off the operating electric circuit of the operating motor of the DS.

FIG. 4 shows the interlock device of the disconnector operator when DS is set to 017. By turning DS off, the locking plate 5 is pushed up, and at that position, the rod of the latch lock 7 comes to oppose the hole in the locking plate, and the locking plate 5. The shutter 8 is now fixed by the padlock 18.

Fig. 5 shows the earthing switch operating device when the GS is turned on, and the latch lock 7 is turned on by rotating the two keys of the latch lock 7 in the DS OF'F state of Fig. 4. The rod protrudes through the locking plate 5, allowing the two keys to be removed.The removed keys are then attached to the latch lock 15 of the GS operating device and rotated, causing the rod to be recessed and the GS operating end to be You can turn on the GS by inserting the handle into the handle.

When the GS is turned ON, the locking plate 13 protrudes, so a lock plate 20 is placed between the tip of the locking plate 13 and the shutter 19 provided at the end of the operating shaft to prevent the GS from being inadvertently set to ○IFF when inspecting the OB. ing.

(Effects of the Invention) According to the present invention, a complete interlock is provided between the fixed circuit breaker, the electrically operated disconnector, and the earthing switch, thereby improving safety and reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a disconnector operating device equipped with an interlock according to an embodiment of the present invention, FIG. 2 is a perspective view of a grounding switch operating device equipped with an interlock according to an embodiment of the present invention, and FIG. 3 is a perspective view of the disconnector operator interlock device during auxiliary manual operation, Figure 4 is a perspective view of the disconnector operator interlock device when DS is set to FF, and Figure 5 is the grounding switch when ON. FIG. 6 is a main circuit diagram of a general switchboard having a fixed circuit breaker, an electrically operated disconnector, and a grounding switch. 1: Disconnector operating device, 2: Motor, 3: Operating shaft, 4 Nissin spindle, 5: Locking plate, 6: Link holder, 7: Latch lock, 8: Shutter, 9: Solenoid, 10: Limit switch, 11: Grounding switch instrument operation axis,
12: moving nut, 13: locking plate, 14 lever, 15 = latch lock, 16: opening/closing instruction device, 1
7: Handle, 18: Badrotsuk, 19; Nyatta, 2
0: Padlock, OB = Circuit breaker, DS: Disconnector, GS:
Earthing switch, M: Motor. Yamaguchi j /V Dry Figure 5 Figure 6

Claims (1)

[Claims] 1) In a power distribution board equipped with a fixed circuit breaker, an electrically operated disconnector connected to the circuit breaker, and a grounding switch that grounds the connecting end of the circuit breaker, the circuit breaker and the A locking plate that provides a key interlock with the earthing switch is attached to the operation shaft of the disconnector so as to perform linear movement via a link lever, and the circuit breaker and the disconnector are attached to the front of the auxiliary manual handle mounting shaft of the disconnector. A shutter plate is provided for interlocking the device operating motor with a solenoid and a limit switch, and a locking plate for interlocking the disconnect switch and a key on the front surface of the operating shaft end of the operating device of the earthing switch is provided on this operating shaft. An interlock device for a power distribution board, characterized in that it is installed to perform linear motion via a link lever.