JP3263969B2 - DC high speed circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC high-speed circuit breaker, and more particularly to a structure of an arc chute of the DC high-speed circuit breaker.

[0002]

2. Description of the Related Art FIG. 4 shows a configuration of a conventional DC high-speed circuit breaker (HSCB). In FIG. 4 , the main circuit current I to be interrupted is transferred from the holding conductor 2 passing through the holding core FH to the fixed contact FC, the contact portion A, the movable contact MC, and the tripping core FT.
It is guided to the conductor 3 through the trip and arc blowing coil TC wound more than twice.

At the open end side of the holding iron core FH, an impactor AT forming a magnetic circuit together with the holding iron core is attracted to the holding iron core FH by a magnetic force Φ _H by the current I.

On the other hand, tripping core FT forms a magnetic circuit together with the impactor AT via a gap, impactor AT is under the suction force of the magnetic force [Phi _T generated in the tripping core FT by the current I.

However, when the current I is small and when the current increase rate di / dt is small, the magnetic force is in the relationship of Φ _H > Φ _{T and} the impactor AT does not move while being attracted to the holding core side.

However, when the current I reaches a specified value (current scale value), or even if it is somewhat smaller than the specified value, d
If i / dt is large, the magnetic force becomes Φ _H <Φ _T , and the impactor A
T leaves the holding core FH by the magnetic attraction force of the tripping core FT and moves toward the suction core FT at a high speed. At that time, the impactor AT collides with the movable contact MC, and the impact energy causes the movable contact MC to be tripped and simultaneously moved in the iron core FT direction.

When the movable contact MC moves away from the fixed contact FC, an arc is generated from the arcing contact connected to the upper portion of the contact portion A. This arc is pushed upward by the electromagnetic force generated by the trip and arc blowing coil TC, moves between the two arc horns AH, is pushed further upward, and enters the arc chute AS.

FIG. 5 shows the structure of the arc chute AS. In FIG. 5 , 11 and 11 have a vertical and horizontal length of about 30.
With an insulating plate of 0 × 700 mm × about 500-1300 mm,
The insulating plates 12, 12 at both ends oppose each other at an interval of about 30 to 70 mm, and constitute an arc chute AS chamber.

In the arc chute AS, a pair of arc horns is provided at a lower portion thereof, and a central arc guide 21 having a coil portion C of one or several turns as shown in FIG. An insulating partition plate 2 having a coil portion C provided vertically downward and a V-shaped arc guide 23 fixed to the lower end on both sides thereof as shown in FIG.
5, 25 are provided radially away from the base of the arc horn AH.

As shown in FIG. 5 , the arc generated at the time of interruption is first transferred to the arc horns AH, AH,
1 through the coil section C. For this reason, an electromagnetic force is generated to further blow up the arc.

Therefore, the arc from one arc horn is transferred from one arc guide 23 to the center arc guide 21.
Through the coil section C, and flows through the other arc guide 23 to the other arc horn AH. Thus, the arc sequentially moves and extends in the direction of the arrow. This increases the arc voltage, forcibly limits the DC current, eventually forms a current zero point, and forcibly extinguishes the arc.

[0012]

In a DC high-speed circuit breaker, the difficulty in interrupting DC current lies in how quickly the current limiting action is performed to create a current zero point. However, in the case of the conventional arc chute described above, the current is limited by blowing upward and extending the arc, so that the arc chute is not large and the current limiting action is not good.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a cooling unit in an arc chute to cut off an arc in a short arc time and to cut off a high-speed DC current. It is an object of the present invention to provide a DC high-speed circuit breaker capable of downsizing a circuit breaker.

[0014]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a method for manufacturing a vehicle , comprising:
A horn is provided and a coil is installed in the center of the arc chute.
A central arc guide having a section is provided, and an arc shoe is provided.
A large number of vertically elongated iron plates at the top of the
A cooling unit that is attached at a
Of the high-speed DC circuit breaker
The length is alternately long and short, and the lower end is aligned so that the upper half
It is characterized in that the gap is approximately doubled.

[0015] Alternatively, a pair of
An arc horn is provided, and a coil section is provided inside the arc chute.
Both ends extend to near the top end in the arc chute.
An arc shoe with a centered arc guide
On both sides of the central arc guide at the top inside
A large number of thin steel plates are attached at regular intervals
DC height with a pair of cooling units that open downward
In the speed circuit breaker, the length of the iron plate of the cooling
Approximately double the gap between the iron plates in the upper half by aligning the lower ends
It is characterized by having done.

A coil is provided between the pair of arc horns and the cooling section.
One or more arc guides having no
No.

[0017]

[Action] (1) The central arc guide is a pair of arc horns
When installed between the arc horn and the cooler
The transferred arc is generated by the coil part of the central arc guide
Is blown up and extended by the electromagnetic force
Phase between the arc extension and the cooling effect of the iron plate in the cooling section.
Increase in arc voltage and DC current limiting due to riding effect
It is also powerful and has low current limit value and short arc time.
Disappears.

A pair of cooling sections are provided on both sides of the central arc guide.
If provided, arc transferred to arc horn
Moves to the central arc guide,
Powerfully blown up by the electromagnetic force generated by the
You. At this time, the center arc guide is
Since it extends to near the upper end, it reaches the zero point of the arc current
Electromagnetic force by the coil part of the central arc guide until interrupted
As it does not decline, the blowing effect is strongly maintained. Blowing
When arc raised is Ru is cooled enters the gap of the cooling unit
In both cases, the arc widens from the narrow space between the iron plates in the cooling section.
Where they are stretched and cut off by leaving
You.

A coil is provided between the pair of arc horns and the cooling section.
If one or more arc guides with no
Arc transferred to arc horn has no coil
It is also transferred to the cooling section by the arc guide.

[0020]

An embodiment of the present invention will be described with reference to the drawings.
The same components as those shown in FIG. 5 are denoted by the same reference numerals, and the description thereof will not be repeated.

Embodiment 1 Referring to FIG. 1, reference numerals 30 and 30 denote a pair of arc cooling portions provided at an upper portion in the arc chute AS, and as shown in FIG. And the same thickness and length as the iron plate 31
A vertically elongated iron plate 32 provided with a plurality of projections P on both sides in / 2 to 2/3, and the projections P are fitted into holes h formed in the insulating plate 11 alternately so that the lower ends thereof are aligned with each other. It is configured by mounting it.

Reference numeral 22 denotes a central arc guide provided at an intermediate portion between the pair of arc horns AH and the arc cooling portions 30, 30.
Thus, the conventional central arc guide ( FIG. 5 ) has a reduced length . 23, 23 are arc guides provided in the radial direction between the cooling units 30, 30 and the arc horn AH, apart from the base of the arc horn.

According to this embodiment, a DC breaker ( FIG. 4 )
Generated at the time of shutting off, the arc blown up by the electromagnetic force of the trip and blow-out coil TC and transferred to the pair of arc horns AH moves upward between the pair of arc horns AH, and the arc guides 23, 22,. Bridging 23.

For this reason, a current flowing through the coil portion C of the central arc guide 22 generates a magnetic flux in the axial direction of the coil portion C, and the electromagnetic force causes the arc to be blown up more strongly. The blown-up arc is cooled by the cooling units 30, 3
The plurality of iron plates 31 and 32 enter the gaps and are blown up further.

That is, the arc sequentially moves and extends in the direction of the arrow, and is strongly cooled by the plurality of iron plates 31 and 32. Therefore, the increase in arc voltage is also strong,
The current limiting action of the DC current is also strong, and the arc is extinguished with a low current limiting value and a short arc time.

Embodiment 2 Referring to FIG. 3, reference numeral 21 denotes a central arc guide 21 shown in FIG.
The central arc guide 30 ', 30', which is constructed in the same manner as in
An arc cooling section disposed above the arc chute AS chamber so as to sandwich 1 'is formed by alternately providing iron plates 31, 32 similarly to the arc cooling sections 30, 30 in FIG.
Other configurations are the same as those of the first embodiment, and therefore, the same components will be denoted by the same reference numerals and description thereof will be omitted.

According to this embodiment, the arc transferred to the pair of arc horns AH when the circuit breaker is shut off is the arc horn A.
While moving upward between H, the arc guides 23, 2
Bridge 1,22. At this time, the electromagnetic force generated by the coil portion C of the central arc guide 21 is blown up more strongly, and the iron plates 31, 3 of the cooling portions 30 ', 30'.
2 enters the gap.

As a result, the arc is strongly cooled by the iron plates 31 and 32, is extended, and the arc voltage rises sharply. At this time, the tip of the central arc guide 21 'extends to the top of the arc chute AS. Therefore, the electromagnetic force by the coil C does not decrease until the arc current reaches the zero point and is cut off, so that a strong blowing effect is maintained.

[0029]

[0030]

[0031]

[0032]

[0033]

Since the present invention is configured as described above, the following effects can be obtained.

(1) According to the first aspect of the present invention, the arc transferred to the arc horn is blown up and extended by the electromagnetic force generated by the coil portion of the central arc guide and enters the cooling section. Due to the synergistic effect of the cooling effect by the iron plate of the part and the increase of the arc voltage and the current limiting action of the direct current, the arc is extinguished with a low current limiting value and a short arc time.

(2) According to the second aspect of the present invention, the central arc
The guide extends near the top of the arc chute
The center arc until the zero point of the arc current is cut off.
Since the electromagnetic force of the coil part of the guide does not decline,
Arc blow-up sustaining effect and cooling effect by iron plate in cooling section
When the arc is wide from the narrow space between the iron plates in the cooling section
Arc due to the synergistic effect of the distraction effect by going out to the rollers
The voltage rise and the DC current limiting effect also become stronger,
In addition, the arc disappears at a low current limit value and a short arc time.

[0036] (3) the Therefore, it is possible to further miniaturization of the arc chute.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an internal configuration of an arc chute according to a first embodiment.

FIG. 2 is a diagram illustrating a configuration of a cooling unit.

FIG. 3 is an explanatory diagram of an internal configuration of an arc chute according to a second embodiment.

FIG. 4 is a diagram illustrating the configuration of a conventional high-speed circuit breaker.

FIG. 5 is an explanatory view of the internal configuration of a conventional arc chute.

FIG. 6 is a perspective view showing an arc guide.

FIG. 7 is a perspective view showing a center arc guide.

[Explanation of symbols]

 11: Insulating plate 21, 22, 23 ... Arc guide 30, 30 ', 30 "... Cooling unit 13, 14, 15, 31, 32 ... Iron plate AH ... Arc guide AS ... Arc chute C ... Coil portion.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-8767 (JP, A) JP-A-3-182020 (JP, A) JP-A-6-1229932 (JP, U) JP-A 50-87 146067 (JP, U) Japanese Utility Model Showa 56-109235 (JP, U) Japanese Utility Model Showa 54-44969 (JP, U) Japanese Utility Model Showa 42-21372 (JP, Y1) Japanese Utility Model Showa 41-24888 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 33/00-33/26 H01H 9/30-9/52

Claims (3)

(57) [Claims] 1. A pair of arcing horns at the bottom of the arc chute is provided, the central arc guide is provided to have a coil portion in the center of the arc chute, an elongated steel plate in the vertical direction in an upper portion of the A Kushuto cooling unit is set with a large number are open vertically mounted at regular intervals
In the DC high-speed circuit breaker, the length of the iron plate of the cooling section is alternately long and short, and the lower end is aligned.
A DC high-speed circuit breaker characterized in that the gap between the upper half iron plates is approximately doubled . Wherein arc pair of arcing horns at the bottom of the chute is provided, center shape extending to the uppermost end near the arc in both tip arc chute has a coil portion in the center of the arc chute guides is provided, a pair of cooling section that opens a large number of elongated steel plate in the vertical direction on either side of the center of the arc guide mounted <br/> vertically at regular intervals at the top of the arc chute is provided DC
In high-speed circuit breakers, the length of the iron plate in the cooling section is alternately long and short, and the lower end is aligned.
A DC high-speed circuit breaker characterized in that the gap between the upper half iron plates is approximately doubled . 3. A coil section between an arc horn and a cooling section.
Or one or more arc guides having no arc guide.
Is a DC high-speed circuit breaker according to 2 .