JPH1080018A - Drawer type high-voltage switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the electric separating space between the mutual electric conductors on the side of a power supply and to realize the safe insulating dimensions by arranging the electric conductor of the second- and third-phased electric fuses in the vicinities of the insulating tube of the first-phase power fuse. SOLUTION: The first-phase power fuse 4a is provided among conducting terminals 6a and 8a and between a insulator 7a and an insulator 9a. Furthermore, a second-phase power fuse 4b has conducting terminals 6b and 8b and an insulating tube 5b and is provided between an insulator 7b and an insulator 9b. Furthermore, the third-phase power fuse 4c has conducting terminals 6c and 8c and an insulating tube 5c and is provided between insulators 9c. Then, electric conductors 10b and 10c of the second- and third-phase power fuses 4b and 4c are arranged in the vicinity of an insulating tube 5a of the first-phase power fuse 4a. Thus, the insulation separating dimensions between the electric conductors 10a-10c with the respective phases of 4a-4c can be secured only by space insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer-type high-voltage switchgear in which electric devices such as a power fuse, a high-voltage contactor, a transformer for an instrument, and a current transformer are mounted on a drawer stand so as to be movable.

[0002]

2. Description of the Related Art As this kind of conventional technology, Japanese Patent Publication No.
A drawer-type opening / closing device disclosed in Japanese Unexamined Patent Publication No. 731 is known, and this prior art will be described with reference to FIGS.

FIG. 5 is a side view of the drawer type opening / closing device, and FIG. 6 is a sectional view taken along line AA of FIG. Drawer stand 101
Wheels 102 are provided at both front and rear ends of the drawer stand 101 so as to be able to be pulled out. A high-pressure vacuum contactor 104 having an opening / closing function and each vacuum of the high-pressure vacuum contactor 104 are provided in an insulating case 103 of the drawer stand 101. Each of the power fuses 107 for protecting the short circuit of the high voltage circuit connected in series with the valve 105 is housed and installed.

The opposite side of each vacuum valve 105 from the terminal connected to the power fuse 107 is connected to a load output terminal 109 via a load conductor 108 embedded in the insulating case 103. .

The other side of the power fuse 107 opposite to the terminal connected to the vacuum valve 105 is connected to a power supply side output terminal 111 via a power supply side conductor 110 embedded in the insulating case 103. I have.

[0006]

The prior art described above is
The load-side conductor 108 and the power-supply-side conductor 1 are placed in the insulating case 103.
10 and 10 are integrally embedded, so it is downsized.
The mold for molding the insulating case 103 becomes large and expensive. The load-side conductor 108 and the power-supply-side conductor 1
Since 10 is buried in the insulating case 103, there is a fear that the insulating case 103 may be cracked by the heat generated from each of the conductors 108 and 110 or dielectric breakdown may occur. Did not.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a unit drawer type high pressure switchgear which has a simplified structure and improved safety.

[0008]

The present invention employs the following means in order to solve the above-mentioned problems.

An electric conductor of each phase, which is connected to a movable drawer stand at least with a three-phase power supply side terminal mounted on a fixed frame so as to be able to come and go, and a phase connected to the electric conductor of each phase. A drawer-type high-voltage switchgear provided with an electric device having a power fuse according to claim 1, wherein the first-phase electric conductor is disposed horizontally from the first-phase power-supply-side terminal, and the first-phase power fuse is provided. And the electrical conductor of the second phase is
The power conductor side terminal of the phase crosses at right angles to the insulating cylinder of the power fuse of the first phase and is disposed in a creeping manner, is connected to the power fuse of the second phase, and the electric conductor of the third phase is:
The third phase power fuse intersects at right angles from the third phase power supply side terminal with the first phase power fuse insulation cylinder and the second phase power fuse insulation cylinder, and is arranged in a creeping manner. It is characterized by being connected.

The second-phase electric conductor is bent in an L-shape between the first-phase power fuse and the second-phase power fuse along an insulating cylinder of the second-phase power fuse. The electric conductor of the third phase is
The power fuse of the third phase is bent in an L-shape between the power fuse of the third phase and the power fuse of the third phase, and is arranged along the insulating cylinder of the power fuse of the third phase.

The electric conductors of the second phase and the third phase may be provided through respective three dividing points in the longitudinal direction of the insulating cylinder of the power fuse of the first phase. It is characterized by.

According to the present invention, by employing the above means, in the unit draw-out type high-voltage switchgear, the electric conductors of the second-phase and third-phase power fuses are arranged near the insulating cylinder of the first-phase power fuse. This secures an electrically isolated space between the electric conductors on the power supply side and realizes safe insulation dimensions.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a side view showing the overall structure of a unit drawer type high pressure switchgear according to the present invention. FIG. 2 is a symbol A in FIG.
3 is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line CC in FIG.

1 to 4, reference numeral 1 denotes a drawer stand, 1A
Is a wheel, 2 is a fixed frame, 3 is a high-pressure vacuum contactor having an opening and closing function, 4a to 4c are power fuses for short-circuit protection of high voltage circuits, 5a to 5c are insulating cylinders of power fuses, 6a to 6c,
8a to 8c are energizing terminals of a power fuse, 7a to 7c, 9
a to 9c, 11a to 11c, 17a to 17c are insulators, 10a to 10c are conductor connection fittings, 12a to 12c,
19a to 19c are insulating support bushings, 13a to 13c
Is a power supply terminal, 14a to 14c are contact fittings, 15a to 1
5b is a vacuum valve, 16a and 16c are current transformers, 18a
Reference numerals 18c to 18c denote conductor fittings, 20a to 20c denote load-side terminals, 21a and 21b denote operating transformers. In addition,
A to c shown in the above-mentioned respective symbols represent each of three phases.

The unit drawer type high pressure switchgear of the present invention is provided with movable wheels 1A at both front and rear ends of the drawer stand 1, and can be moved horizontally in the left-right direction in FIG. . A high-pressure vacuum contactor 3 having an opening / closing function and a vacuum valve 1 for three phases of the high-pressure vacuum contactor 3 are provided in the drawer base 1.
5a to 15c, three-phase power fuses 4a to 4c connected through contact fittings 14a to 14c, power fuse 4
a, 4c, and electric devices including current transformers 16a, 16c and operation transformers 21a, 21b are housed and installed.

The first to third phase power supply side terminals 13
a to 13c and first to third phase load-side terminals 20a
20c is an insulating bushing 1 fixedly supported by the fixed frame 2
2a to 12c and 17a to 17c are fixedly supported.

Next, the configuration of the electric equipment of each phase in this embodiment will be described.

The first-phase electric device is configured as follows.

The power fuse 4a is connected to the energizing terminals 6a, 8a
And an insulator cylinder 5a, an insulator 7a and an insulator 9a
It is provided between them.

One end of the conductor connection fitting 10a is connected to the first phase power supply side terminal 13a so as to be able to contact and separate from the first phase power supply side terminal 13a.
And are horizontally arranged. The other end is connected to the energizing terminal 6a of the power fuse 4a, and the insulator 7a
Is fixedly supported.

The current-carrying terminal 8a is connected to the connection fitting 14a, the vacuum valve 15a, the current transformer 16a, and the conductor connection fitting 18a supported by the insulator 17a in this order.
“a” is connected to the first-phase load-side terminal 20a so as to be able to contact and separate therefrom.

Next, the electrical equipment of the second phase is configured as follows.

The power fuse 4b is connected to the energizing terminals 6b, 8b
And an insulating cylinder 5b, and an insulator 7b and an insulator 9b
It is provided between them.

One end of the conductor connection fitting 10b is connected to the second phase power supply side terminal 13b so as to be able to contact and separate from the second phase power supply side terminal 13b.
, And are disposed horizontally. The middle part is the first
It is disposed so as to intersect at right angles with the insulating cylinder 5a of the power fuse 4a of the phase, and is creeped, and is bent in an L shape near the insulating cylinder 5b of the power fuse 4b of the second phase. Crawling along 5b. The other end is connected to the conducting terminal 6b of the power fuse 4b, and the insulator 7b
Is fixedly supported.

As shown in FIG. 1, when the intermediate portion of the conductor connection fitting 10b is disposed so as to intersect at right angles with the insulating cylinder 5a of the first-phase power fuse 4a and crawl, as shown in FIG. The insulating cylinder 5a is disposed in the vicinity of a dividing point where the insulating cylinder 5a is divided into three equal parts. As a result, in the middle part of the conductor connection fitting 10b, the conductive terminal 4a of the power fuse 4a and the conductor connection fitting 10c described later are spatially arranged at equal intervals, and a good insulating space can be secured. The energizing terminal 8b is connected to the connection fitting 14.
b, the vacuum valve 15b, and the conductor connection fitting 18b supported by the insulator 17b in this order.
Is connected to the second phase load-side terminal 20b so as to be able to contact and separate therefrom.

Next, the electrical equipment of the third phase is configured as follows.

The power fuse 4c is connected to the power supply terminals 6c and 8c.
And an insulating cylinder 5c, an insulator 7c and an insulator 9c.
It is provided between them.

One end of the conductor connection fitting 10c is detachably connected to the third-phase power supply side terminal 13c, and the insulator 11c
And are horizontally arranged. The intermediate part is the insulating cylinder part 5 of the first and second phase power fuses 4a, 4b.
a, 5b and at a right angle, and creepingly arranged, and L is set near the insulating cylinder 5c of the third-phase power fuse 4c.
After being bent in the shape of a letter, it is creepingly arranged along the insulating cylinder 5c. The other end is connected to the power supply terminal 6c of the power fuse 4c, and is fixedly supported by the insulator 7c.

As shown in FIG. 1, when the intermediate portion of the conductor connection fitting 10c is disposed so as to intersect at right angles with the insulating cylinder 5a of the first-phase power fuse 4a and creep, the power fuse 4a The insulating cylinder 5a is disposed in the vicinity of a dividing point where the insulating cylinder 5a is divided into three equal parts. As a result, the middle part of the conductor connection fitting 10c is spatially arranged at equal intervals between the conductor connection fitting 10b and the conducting terminal 8a of the power fuse 4a, and a good insulating space is secured.

The current-carrying terminal 8c is connected to the connection fitting 14c, the vacuum valve 15c, the current transformer 16c, and the conductor connection fitting 18c supported by the insulator 17c in this order.
c is removably connected to the third-phase load-side terminal 20c.

As described above, according to the present embodiment, the first
The phase conductor connection fitting 10a is connected to the first phase power fuse 4a.
The second phase conductor connection fitting 10b and the third phase conductor connection fitting 10c are disposed so as to extend horizontally without being bent from the current-carrying terminal 6a of the first phase power fuse 4a in the longitudinal direction of the insulating cylinder 5a of the first phase power fuse 4a. Are arranged so as to crawl the first-phase power fuse 4a at a position where the first-stage power fuse 4a is divided into approximately one-third, and a first-phase conductor connection fitting 10a and a third-phase conductor connection fitting 10c are provided. Is the second phase conductor connection fitting 10b
Are arranged at substantially equal intervals vertically.

[0033]

As described above, according to the present invention,
By dividing and using the insulating part in the longitudinal direction of the insulating cylinder of the first phase power fuse, the insulation isolation dimension from the other phase electric conductor can be secured only by spatial insulation, and special insulation to supplement the insulating space There is no need for an advanced technique of embedding integrally with the member or the insulating member, and an inexpensive drawer-type high-voltage switchgear can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire configuration of a unit drawer type high-pressure switchgear according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 showing one embodiment of the present invention.

FIG. 3 is a sectional view taken along the line BB of FIG. 1 showing one embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along reference symbols C to C in FIG. 1 showing one embodiment of the present invention.

FIG. 5 is a side view showing the entire configuration of a drawer type opening / closing device according to the related art.

FIG. 6 is a cross-sectional view taken along reference marks A to A in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Drawer stand 1A Wheel 2 Fixed frame 3 High-pressure vacuum contactor 4a-4c Power fuse 5a-5c Insulation cylinder 6a-6c, 8a-8c Power fuse energizing terminals 7a-7c, 9a-9c, 11a-11c, 17a
-17c Insulator 10a-10c, 18a-18c Conductor connection fitting 12a-12c, 19a-19c Insulation support bushing 13a-13c Power supply terminal 14a-14c Contact fitting 15a-15c Vacuum valve 16a, 16c Current transformer 20a-20c Load Side terminal 21a, 21b Operation transformer

Claims (3)

[Claims] 1. An electric conductor of each phase, which is connected to a movable drawer stand at least so as to be able to contact and separate from a three-phase power supply terminal mounted on a fixed frame, and is connected to an electric conductor of each phase. A drawer-type high-voltage switchgear provided with an electric device having a power fuse of each phase, wherein the first-phase electric conductor is disposed horizontally from the first-phase power-supply-side terminal, A second power conductor connected to a power fuse, the second phase electrical conductor intersects at right angles from the power supply side terminal of the second phase to the insulation tube of the first phase power fuse, and is disposed in a creeping manner; And the third-phase electric conductor is perpendicular to the insulating cylinder of the first-phase power fuse and the insulating cylinder of the second-phase power fuse from the third-phase power supply terminal. Intersecting and creeping and connected to the third phase power fuse. A drawer-type high-pressure switchgear characterized by being operated. 2. The power fuse according to claim 1, wherein the second phase electric conductor is bent in an L-shape between the first phase power fuse and the second phase power fuse. The third-phase electric conductor is bent in an L-shape between the second-phase power fuse and the third-phase power fuse, and the third-phase electric power is provided between the second-phase power fuse and the third-phase power fuse. A drawer-type high-voltage switchgear, which is creepingly arranged along an insulating tube of a fuse. 3. The method according to claim 1, wherein
The electric conductors of the second phase and the third phase are disposed through each of three equally divided points in the longitudinal direction of the insulating cylinder of the power fuse of the first phase. A drawer-type high-pressure switchgear characterized by being operated.