JPH07115714A - Metal enclosed switchgear - Google Patents

Abstract

PURPOSE:To provide a switchgear of which mechanical part can be individually pulled out by releasing a link and make easier the maintenance and check and reduce the installation area thereof by connecting in direct the fixing side of a shielding part to a bus and then connecting the movable side through a T-shaped bush. CONSTITUTION:For check of a mechanical part 3, the mechanical part 3 is first driven to open a vacuum valve 5. Next, a front end of a link 7 is pulled from a drive shaft by removing a stopper ring fixed to the drive shaft of the mechanical part 3. Moreover, the rear surface of the mechanical part 3 is pulled up to the check position by removing a bolt 20 fixed to the shielding part 4. As a result, the mechanical part 3 can be separated from the high voltage portion keeping the predetermined distance and thereby internal check can be done safely.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a metal closed switchgear.

[0002]

2. Description of the Related Art FIG. 5 is a right side view of a conventional metal-closed switchgear, showing a power receiving panel. In FIG. 5, the upper part of the front surface of the metal box body 31 whose outer periphery is surrounded by a mild steel plate is
A door 31a is attached, and a door 31b is provided below the door 31a.
Is attached.

Of these, a control equipment room 13 in which a protective relay and the like are housed is provided in the rear portion of the door 31a, and a high voltage housing a lightning arrester and an instrument transformer (not shown) is housed in the lower rear portion of the door 31b. An equipment room 31c is provided. A door (not shown) is attached to the front end of the high-voltage equipment chamber 31c.

A drawer type vacuum circuit breaker 32 is placed on the upper surface of the high-voltage equipment chamber 31c. This vacuum circuit breaker 32
A mechanism portion 33 formed in an L shape on the front side, and this mechanism portion 33
34, which is attached to the rear of the
As shown in FIG. 3, which is a sectional view taken along the line BB of FIG.

Among them, the wheels 33a are provided at the lower end of the mechanism portion 33.
Are provided on the front, rear, left and right, and a pair of handles 33b are attached to the front surface of the mechanism portion 33. The front end of the upper connecting conductor 34b is fixed to the upper end of the vacuum valve 34a.
The front side of the flexible conductor 9 is connected to the movable shaft penetrating the lower end of a.

On the rear side of the flexible conductor 9, a lower connecting conductor is formed.
The front end of 34c is connected. Upper connection conductor 34b on the upper side
The front side of the connection finger 35A, not shown in detail, is attached to the rear end, and the connection finger is also connected to the rear end of the lower connection conductor 34c.
The same connection finger 35B as 35A is attached.

Of these, behind the connecting finger 35A,
The insulator 36A is vertically fixed to the box 31, and the connecting finger 35B
A pair of insulators 36B is vertically fixed to the rear of the. Of these, the middle part of the busbar connecting conductor 37A formed in a substantially L shape is fixed to the lower surface of the upper insulator 36A, and the lower insulator 36A is fixed.
The front portion of the cable connecting conductor 37B, which is longer than the busbar connecting conductor 37A, is also fixed to the upper surface of 36B.

Of these, the front end of the connecting conductor 39 is connected to the rear end surface of the upper busbar connecting conductor 37A.
The rear end of the box body 31 is connected to a bus bar 40 which is provided above the rear portion of the box body 31 in a direction orthogonal to the plane of the drawing. The busbar 40 is connected to a busbar of a switchgear (not shown) adjacent to the power receiving board in a direction orthogonal to the plane of the drawing.

On the other hand, a through-type current transformer 38 is preliminarily fitted in the central portion of the lower cable connecting conductor 37B, and the rear portion of the cable connecting conductor 37B is fixed to the box body 31.
It is fixed to the lower surface of 36c with a bolt (not shown).

A zero-phase current transformer 18 is attached to the lower rear portion of the box body 31, and a load-side cable 41 raised from the rear end of the installation surface of the box body 31 vertically extends the zero-phase current transformer 18. The compression terminal 41a that is connected to the upper end of the load-side cable 41
It is connected to the rear end surface of the cable connecting conductor 9 described above with a bolt.

In the metal-closed switchgear configured as described above, the secondary sides of the current transformer 38 and the zero-phase current transformer 18 are connected to the control equipment room 13 and mounted in the control equipment room 13. The output is input to the protective relay. if,
When a short circuit accident occurs in the load circuit such as the electric motor connected to the load side cable 41 and the overcurrent is detected,
The operation signal of the protective relay is transmitted to the mechanical section 33 of the vacuum circuit breaker 32, and the vacuum valve 34a is opened.

On the other hand, when inspecting the vacuum circuit breaker 32 or the load connected to the load side cable 41, the vacuum circuit breaker 32 is driven to open the vacuum valve 34a, and then the vacuum is pulled by the handle 33b. Pull out the circuit breaker 32 to the left in FIG.

[0013]

However, in the metal-closed switchgear configured as described above, the current transformer is
Due to the space required for mounting the 38 and the connecting fingers 35A and 35B, the depth of the box body 31 becomes deeper,
The installation area of 31 increases. Then, it is necessary to increase the installation area of the power receiving equipment composed of the metal-closed switchgear and the adjacent feeder panel. Therefore, an object of the present invention is to obtain a metal-closed switchgear that can be easily inspected and can be installed in a small area.

[0014]

According to the present invention, a vacuum valve, a current transformer connected to a fixed-side conductor of the vacuum valve, and a center connected to a movable-side conductor of the vacuum valve on one side via a flexible conductor. A vacuum circuit breaker composed of a breaker unit in which a conductor is integrally made of insulating resin, a mechanism unit connected to the breaker unit via a link, and a T-shaped bushing having one side connected to the other side of the center conductor are provided. This is a metal-closed switchgear characterized by the above.

[0015]

[Function] The mechanism part can be independently pulled out by removing the link, and the fixed side of the blocking part is directly connected to the bus bar.
The movable side is connected via a T-shaped bushing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the metal closed switchgear of the present invention will be described below with reference to the drawings. FIG. 1 is a right side view showing a metal switchgear according to the present invention, which corresponds to FIG. 5 shown in the prior art, and the same parts as those in FIG. 5 are denoted by the same reference numerals.

In FIG. 1, a pull-out type vacuum circuit breaker 2 is provided on the upper surface of a high-voltage equipment chamber 1c provided in the lower part of a metal box body 1, and a wheel 3a is provided at the lower end of the vacuum circuit breaker 2.
And a handle 3b attached to the front face of the handle 3b so that the handle 3b can be pulled out freely.

On the rear surface of the mechanical portion 3 of the vacuum circuit breaker 2,
The front end of the blocking portion 4 described in detail below is fixed with a bolt 20. The front end of the link 7 is connected to the right side surface of the mechanism portion 3 via a pin provided at the front end of the link 7.

An insulating layer 4a made of epoxy resin is provided on the blocking portion 4.
A vacuum valve 5 for three phases is pre-embedded in the center of the vacuum valve 5 as shown in FIG. 1 and FIG. 2 showing an AA cross section of FIG. 1, and the lower end is joined to the upper end of the vacuum valve 5 on the fixed side conductor. The current transformer 6 is inserted into the first phase and the third phase of the first phase and the third phase.

The rear end of the above-mentioned link 7 is connected to the lower end of the insulating rod 8 which is connected to the movable conductor protruding upward from the lower end of the vacuum valve 5 through a pin (not shown),
The front side of the flexible conductor 9 formed in a U shape is connected to the rear surface of the intermediate portion of the movable side conductor.

The front end of the central conductor 11 is joined to the rear surface of the flexible conductor 9, and the middle part to the rear part of the central conductor 11 is covered with the male part 4b of the insulating layer 4a. These central conductors
11, vacuum valve 5 and current transformer 6 are all insulating layers 4a
Are integrated in. Supporting portions 10A and 10B are provided rearward above and below the rear surface of the insulating layer 4a.
The rear end surface of B is fixed to a frame (not shown) of the box body 1 with bolts 20.

On the upper end of the insulating layer 4a, a connection terminal 12 brazed to the upper end of the fixed-side conductor that penetrates the current transformer 6 is provided. A lower end of a connection conductor 19 is connected to the connection terminal 12, and an upper portion of the connection conductor 19 is connected to a bus bar 14 provided above the power receiving board in a direction orthogonal to the plane of the drawing.

The male portion 4b of the insulating layer 4a has the male portion 4b.
The male portion of the front end of the T-shaped bushing 15 provided at the rear of the center conductor 15a is inserted, and the front end of the central conductor 15a embedded in the T-shaped bushing 15 is fitted to the rear portion of the central conductor 11. A blind plug 16 is inserted from the rear at the rear end of the T-shaped bushing 15.
The load-side cable 17 that is erected from the rear of the installation floor of the box 1 penetrates the ZCT 18, and the tip of the core wire of the erected load-side cable 17 is fitted to the center conductor 15a of the T-shaped bushing 15. is doing.

In the metal-closed switchgear having the above-described structure, when inspecting the mechanism portion 3, first, the mechanism portion 3 is driven to open the vacuum valve as in the conventional case. Next, the retaining ring (not shown) that fixes the front end of the link 7 to the drive shaft of the mechanism unit 3 is removed, and the front end of the link 7 is pulled out from the drive shaft.

Next, the bolts 20 which fix the rear surface of the mechanism section 3 to the blocking section 4 are removed, and the mechanism section 3 is pulled out to the inspection position shown in FIG. As a result, the mechanism portion 3 can be separated from the high-pressure portion by a predetermined distance, so that the inside can be inspected in a safe state.

Further, when inspecting the load, the blind plug 16 of the T-shaped bushing 15 is replaced with a grounding plug 21 made of metal, and the grounding terminal projecting from the rear surface of the grounding plug 21 and the box are grounded. Connect to line 20. As a result, the load side cable 17
Since the core wire is grounded via the central conductor 15a, it is possible to inspect the feeder board on the load side.

Therefore, in the metal-closed switchgear configured as described above, the current transformer 6 is connected to the vacuum valve 5
By integrally burying it together with the inside of the insulating layer 4a, the connection fingers 35A and 35B and the busbar connection conductor 37 required in the conventional metal closed switchgear shown in FIG.
Since A and the cable connection conductor 37B can be omitted, the depth of the box body 1 can be reduced. Further, when pulling out the mechanism part 3 for inspection, the front end of the link 7 is removed and the rear surface of the mechanism part 3 is fixed to the blocking part 4 by the bolt 20.
By removing it, the drawing operation of the connecting fingers 35A, 35B of the related art is not necessary by pulling it out forward, so that not only the operating force becomes easy, but also there is no contact part between the connecting fingers 35A, 35B and there is no heat generation. Therefore, the factor of temperature rise in the box can be reduced, and the other vacuum valve 5, which is a factor of heat generation, is also covered with the insulating layer 4a and the cooling effect can be improved, so that loss due to heat generation is significantly reduced. be able to.

[0028]

As described above, according to the present invention, the vacuum valve, the current transformer connected to the fixed-side conductor of the vacuum valve, and the center where one side is connected to the movable-side conductor of the vacuum valve via the flexible conductor. A vacuum circuit breaker consisting of a breaker unit in which the conductor is integrated with insulating resin, and a mechanism unit connected to this breaker unit via a link, and a metal closure with a T-shaped bushing, one side of which is connected to the other side of the center conductor. Form a switch gear, the mechanism part can be pulled out independently by removing the link, the fixed side of the blocking part can be directly connected to the bus bar, and the movable side can be connected via the T-shaped bushing, It is possible to obtain a metal-closed switchgear that can be easily maintained and inspected and that can reduce the installation area.

[Brief description of drawings]

FIG. 1 is a right side view showing an embodiment of a metal closed switchgear according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a right side view showing the operation of the metal closed switchgear of the present invention.

FIG. 5 is a right side view showing an example of a conventional metal closed switchgear.

[Explanation of Codes] 1 ... Box, 2 ... Vacuum circuit breaker, 3 ... Mechanism part, 4 ... Shutdown part,
5 ... Vacuum valve, 6 ... Current transformer, 7 ... Link, 8 ... Insulating rod, 9 ... Flexible conductor, 10A, 10B ... Support part, 11, 15a ...
Central conductor, 12 ... Connection terminal, 13 ... Control equipment room, 14 ... Busbar,
15 ... T type bushing, 16 ... blind plug, 17 ... load cable, 18
… Zero-phase current transformer, 19… Connection conductor, 20… Bolt.

Claims (1)

[Claims] 1. A vacuum valve, a current transformer connected to a fixed-side conductor of the vacuum valve, and a central conductor, one side of which is connected to a movable-side conductor of the vacuum valve via a flexible conductor, are integrated with an insulating resin. Closed switch and a vacuum circuit breaker consisting of a mechanical section connected to the cutoff section via a link, and a T-type bushing having one side connected to the other side of the central conductor. gear.