JPS647548Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealed multi-circuit switch that facilitates various inspections of power distribution lines and cables.

As a closed type multi-circuit switch, for example, there is a gas multi-circuit switch whose shape is reduced by arranging a bus bar or the like as a multi-circuit contact in the main gas chamber.

Figures 1 and 2 show this gas multi-circuit switch, showing a tower 1 placed in a predetermined position and a main gas chamber 2 (filled with SF ₆ gas at 0.5 to 1.0 atm) provided inside the tower 1. ), a gas leak lock mechanism 3 that locks the opening/closing mechanism when the gas pressure in the main body gas chamber 2 falls below a certain level (for example, 0.2 atmospheres), and a pressure gauge 4 that indicates the gas pressure in the main body gas chamber 2. , connecting terminals 5, 5a, 5b (molded connected to cables 6, 6a, 6b) protruding downward from the main body gas chamber 2 and electrically integrated with the connecting terminals 5, 5a, 5b. Fixed contacts 7, 7a, 7
b (7b is not shown) and fixed contacts 7, 7a, 7
b and other fixed contacts 9, 9a, 9 having a certain distance and connected to each other by a communication bus bar 8.
b (9b is not shown) and fixed contacts 7-9, 7a
- A movable contact 10 that moves up and down to open and close 9a, 7b-9b, and a frame 1 that supports the movable contact 10
1, a shaft 12 that moves the movable contact 10 up and down via the frame 11, a bellows 13 that blows gas to the contact part that releases gas when the movable contact 10 rises, a guide shaft 14 that guides and supports the frame 11, and a main body gas chamber 2. Mechanism portions 15 each having an airtight structure and driving the shaft 12 up and down;
15a, 15b (for example, kept airtight at 0.5 atmospheres), operation handles 16, 16a, 16b for driving the shaft 12 up and down, and indicator parts 17, 17a, 17b for indicating the open/closed state of the contact part. are doing. The movable contact 10 is supported by a frame 11 via an epoxy resin 22, and includes an elastic conductor 18 that holds the fixed contact when the contact portion is closed, a pair of contact conductors 20 having a gas blow hole 19 in the center, and a pair of It has a connecting conductor piece 21 that connects the contact conductor 20 electrically and mechanically.

However, according to the conventional gas multi-circuit switch, the fixed contacts 7 connected to the cables 6, 6a, 6b,
7a and 7b are sealed inside the main body gas chamber 2, so when performing various inspections of the power distribution lines and cables, the terminal processing parts of the cables 6, 6a, 6b must be removed or the main body gas chamber 2 must be inspected. Terminals had to be inserted, which required special preparation work and made inspection difficult.

In view of the above, the present invention has been developed to facilitate various inspections of power distribution lines and cables.
To provide a sealed multi-circuit switch in which an inspection terminal is taken out from a sealed chamber such as a main body gas chamber, and the switch is locked so that the switch cannot be turned on during inspection work.

The sealed multi-circuit switch according to the present invention will be described in detail below.

3A, 3B, 3C and 3D show an embodiment of the present invention, and since the same parts as in FIGS. 1 and 2 are designated by the same reference numerals, repeated explanations will be omitted. B shows the tower 1, the cables 6, 6a, 6b connected to the connection terminals 5, 5a, 5b that protrude downward from the main gas chamber 2, and the main gas chamber 2.
Inspection terminal 3 protruding downward in an airtight manner
0, 30a, 30b (30 and 30b have blind plugs 31, 31b; 30a has the blind plug removed for grounding work), mechanism parts 15, 15a, 15b, and main body. A cover 32 (fixed by a fixing bolt 32a) provided in front of the gas chamber 2 includes display holes 33, 33a, 33b that indicate the closed state of the switch, and inspection terminals 30, 30.
Display holes 34, 34 indicating the connection status of a, 30b
a, 34b, and operation holes 36, 36a, 36b for operating an operation shaft 35, which will be described later), and operation handles 16, 16a, 16b provided in the mechanism parts 15, 15a, 15b.
B is located between the mechanism parts 15, 15a, 15b and the main body gas chamber 2 and the cover 32, and is connected to the above-mentioned inspection terminals 30, 30a, 30b with cables 6, 6.
When a and 6b are connected, operation handle 1
6, 16a, 16b show the mechanism by which they are locked.
That is, this locking mechanism includes the handle lock plate 37,
37a, 37b and inspection terminals 30, 30a, 3
The operation hole closing plates 38, 38a, 38b that prohibit connection to the cables 6, 6a, 6b of 0b operate together with the operation shaft 35, and their operation locks the handle lock plates 37, 37a, 37b. operation plates 39, 39a, 39b, handle lock plates 37, 37a, 37b, and closing plate 3.
Link member 4 connecting 8, 38a, 38b
0, 40a, and 40b. C shows the lateral positional relationship of the cover 32 and the lock mechanism shown in A and B, and shows the main gas chamber 2 located inside the tower 1, the mechanism part 15 located above it,
An operation handle 16 provided on the mechanism section 15, an instruction section 17 that indicates the closed state of the switch, and the mechanism section 15.
and a cover 32 (having display holes 33 and 36) fixed to the main body gas chamber 2 by bolts 32a,
An operation plate 39 interlocking with the operation shaft 35, a closing plate 38 interlocking with the instruction section 17, a handle lock plate 37 interlocking with the operation plate 39, and a link member 40 connecting the handle lock plate 37 and the closing plate 38.
It has D shows the inside of the main body gas chamber 2, in which the movable contact 10, a frame 11 that supports the movable contact 10, and the movable contact 1 via the frame 11 are shown.
0, a bellows 13 that blows gas to the contact part that releases gas when the movable contact 10 rises, and a fixed contact 7 connected to the cable 6.
, a test terminal 30 that is connected and disconnected via the fixed contact 7 and the connecting conductor 40 , and a blind plug 31 that covers the test terminal 30 , and the above-mentioned operating shaft 3
5 (for example, by rotating the operating shaft 35 in one direction using an operating handle (not shown)), the connecting conductor 41 having an oval shape assumes a vertical position as shown, and is connected to the cable 6 for inspection. terminal 30 can be connected.

In the above configuration, when the operating shaft 35 is rotated counterclockwise through the operating hole 36a of the cover 32 in the open state of the switch, the operating plate 39
The handle locking plate 37a rises due to the rotational movement about the operating shaft 35 (a), and locks the closing movement of the operating handle 16a (states A and B). By this operation of the operating shaft 35, the cable 6a is connected to the test terminal 30a (via the connecting conductor 41 shown in D), and the switch is turned off by the display hole 33a of the cover 32. The inspection terminal 30a is confirmed by the display hole 34a to be
is shown to be in the "on" state. Furthermore, since the operating handle 16 is in the "on" position, the closing plate 38 that is interlocked with the indicator 17 takes the lower position and closes the operating hole 36, so that the switch is closed. This prevents the test terminal 30 from being connected in this state. Furthermore, since the operating shaft 35 operated through the operating hole 36b is in the "off" state, the handle lock plate 37b is in the lower position, and there is no problem even if the switch is closed using the operating handle 16b. It will never occur.

After connecting the cables to the inspection terminals 30 through the above operations, removing the blind plugs 31 from these terminals 30 and connecting, for example, the grounding connector 42, will cause the various types of power distribution lines and cables 6, 6a, 6b to be connected. Inspection can be easily performed (Fig. 3C). The inspection referred to here is, for example, inspection of short circuit grounding, cable withstand voltage, insulation resistance, phase detection, etc.

As explained above, according to the sealed multi-circuit switch according to the present invention, the terminal for inspection is taken out from the sealed chamber such as the main body gas chamber, and the switch is locked so that it cannot be turned on during inspection work. Since inspection is not possible while the power is on, various inspections of power distribution lines and cables can be carried out safely and easily.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional gas multi-circuit switch; Figure 1 is a partially cutaway front view, Figure 2 is a partially cutaway side view, and Figures 3A, B, C, and 1 shows an embodiment of the present invention, A is a front view, B is a front view with a cover removed, C is a side view, and D is a partial sectional view showing the inside of a gas chamber. Explanation of symbols, 1...Tower, 2...Main gas chamber, 3
...Gas leak lock mechanism, 4...Pressure gauge, 5,5
a, 5b... terminal, 6, 6a, 6b... cable, 7, 7a, 7b... fixed contact, 8... bus bar, 9, 9a, 9b... fixed contact, 10... movable contact, 11... Frame, 12...Shaft, 1
3... Bellows, 14... Guide shaft, 15, 15a, 1
5b... Mechanism section, 16, 16a, 16b... Operation handle, 17, 17a, 17b... Instruction section, 1
8...Elastic conductor, 19...Gas blowing hole, 20...
Contact conductor, 21... Connection conductor piece, 22... Epoxy resin, 30, 30a, 30b... Inspection terminal, 31, 31b... Blind plug, 32... Cover, 3
3, 33a, 33b, 34, 34a, 34b...
Display hole, 35... Operation shaft, 36, 36a,
36b... Operation hole, 37, 37a, 37b... Handle lock plate, 38, 38a, 38b... Closure plate, 39, 39a, 39b... Operation plate, 40, 4
0a, 40b...Link member, 41...Connecting conductor, 42...Grounding connector.

Claims (1)

[Claims for Utility Model Registration] (1) A fixed contact connected to a cable, another fixed contact connected to the fixed contact via a movable contact, and an airtight housing housing both of the fixed contacts and the movable contact. A multi-circuit switch comprising: a test terminal taken out from the sealed room to the outside; a connection conductor that connects and disconnects the test terminal and a fixed contact connected to the cable; An airtight seal characterized by comprising: a control section for controlling disconnection of the conductor; and a handle lock section for prohibiting closing of the switch by means of an operating handle when the control section causes the connecting conductor to assume a connecting position. Type multi-circuit switch. (2) The control unit includes an operation shaft that rotates in order to control the attitude of the connection conductor, an operation plate that forces the handle lock unit to a closing prohibited position by rotation of the operation shaft, and a switch. 2. The sealed multi-circuit switch according to claim 1, further comprising a closing plate that prohibits operation of the operating shaft when the operating shaft is turned on.