JPS62268028A - Fine gap current limiting breaker - 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] [Industrial Field of Application] The present invention provides a thin wire that extinguishes the arc by flowing the short circuit current when a short circuit accident occurs in the power system. Current limiting shield a
Regarding equipment.

[Conventional technology]

In normal high-voltage switches, a narrow gap is provided by an arc-extinguishing plate made of insulating, heat-resistant ceramics, etc., and an arc is inserted into the narrow gap by the action of electric power, thereby interrupting the circuit current. Current limiting etc. are being carried out. This interruption or current limiting phenomenon occurs by raising the arc voltage above the circuit voltage. Therefore, in order to increase the arc voltage in the narrow gap method, it is necessary to insert the arc into a narrower part of the narrow gap.

The characteristics of this slit method are expressed by the following

However, E indicates the arc voltage value per arc length, and is usually expressed in low volts/cm.

Further, g is the width of the slit, 5, and K is a proportionality constant due to the material of the arc-extinguishing plate.

As is clear from this equation, the smaller the width g of the slit, the more
The arc voltage E per unit length increases.

From this point of view, a circuit breaker having an electric current as shown in FIG. 3 has been proposed. Hereinafter, this cutoff 2= will be expressed as the third
This will be explained with reference to the diagram.

This interrupter 2U has an internal structure as shown in FIG. However, when a short circuit current flows in the circuit, the movable electrode 2 is connected to the external driver groove (not shown).
Due to this opening operation, an arc AI is generated between the fixed electrode 1 and the movable electrode 2.

Above the identification electrode 1 and the movable electrode 2, an arc runner electrode 3 is electrically connected to the electrodes 1 and 2, respectively.
and 4 are provided. In addition, for the arc runner electrode 3 on the fixed side, a coil 6 is wound around one end of the magnetic body 5 which is arranged so as to wrap the outside of the arc runner electrode 3 in a U-shape.
is connected.

Therefore, the arc A generated by the opening operation of the movable electrode 2 is caused by thermal convection, self-rising action, etc.
jl and the movable electrode 2 to the arc runner electrode 3.4, forming the arc A2. Then, due to the current flowing from the arc runner electrode 3 on the identification side to the coil 6, the arc A!
A magnetic field perpendicular to is generated, and the electromagnetic force causes an arc A2
further rises, becomes arc A3, and is extinguished.

In such an arc extinguishing section, the magnetic field acting on the arc A is generated in principle as follows.

That is, after the arc A2 travels to the horn piece 8, the arc current flows through a path as shown in FIG. In this way, arc A3
extends in a loop. Due to this arc current, a magnetic field H is generated which crosses the end at a right angle. The arc A,
is the arc-extinguishing plate 71°7,,,,. 7. elongated within the slit between.

In order to promote the extension of this arc A, in the conventional arc extinguishing section, arc extinguishing plates 71, 7□, , 7. ,apart from,
Arc-extinguishing plate 7a provided with notches 9a, 9b, 9c,
7b.

7c is further required (Japanese Unexamined Patent Publication No. 57-611).

JP-A-50-8063, JP-A-54-76979
(see Japanese Patent Publication, etc.), and each notch 9a, 9b,
The length of '3c is changed for each arc extinguishing plate 7a, 7b, and 7c. For example, the arc-extinguishing plate 7a is arranged so that the arc A is stretched in the gap between the arc-extinguishing plates 7a, 7b, and 7C.
and 7C, the notches 9a and 9c are formed to be biased to the left and right, respectively.

As a result, when the arc A rises and comes into contact with the horn piece 8, its 7-way A2 is separated, and the
A loop-shaped arc Ai is formed along the lines 9b and 9c.

In this way, the arc A is the individual arc extinguishing plate 7゜7□1.7
1 and the current is limited and the arc is extinguished.

[Problems that the invention attempts to solve]

In this conventional at-gap IIl flow type interruption 2S, the arc is made into a loop shape to elongate it, and the self-finance of the arc is utilized for arc extinguishing. However, since multiple arc-extinguishing plates are used to make one turn of the loop, a large number of arc-extinguishing plates are required to generate a strong self-magnetic field and insert the 7-plate into the narrower wA gap. Requires a board. As a result, the arc extinguishing chamber becomes large, resulting in drawbacks such as an increase in the size and weight of the circuit breaker.

The present invention was devised to solve these problems in conventional slit current limiting type circuit breakers, and the present invention has been devised to solve these problems in conventional slit current limiting type circuit breakers. The purpose is to provide current-limiting circuit breakers.

[Means for solving problems]

In order to achieve the purpose of the slit current limiting type circuit breaker of the present invention, a pair of arc runner electrodes are arranged in parallel above a pair of fixed electrodes and a movable electrode, and further A pair of intermediate electrodes are arranged, and an arc extinguishing plate is laminated between the acid intermediate electrodes to provide a slit arc, and a second magnetic field is generated perpendicular to the magnetic field generated by the arc in this slit space. They are each equipped with an arc drive coil so that the arc extinguishing section is disposed between the arc runner electrode and the intermediate electrode.

[Effect]

Extinguishing the arc using the YuRIIA dynamic arc rotation method 2 is as follows:
Utility Model Publication No. 50-11977, Utility Model Number 49-2465
It is known from the May Publication and Special Publication No. 59-47413. However, in the present invention, the arc is extinguished more quickly by adding this method to a slit current-limited arc extinguishing chamber that extinguishes the arc by inserting the arc into the slit.

In other words, by applying the magnetic field generated by the arc inserted into the arc-extinguishing chamber to the magnetic field generated by the n-driven arc rotation method, the upward force of the arc is increased, and the arc moves into a narrower narrow space between the arc-extinguishing plates. Encourages insertion into the gap.

〔Example〕

Hereinafter, the features of the present invention will be specifically explained with reference to Examples.

FIG. 1 is a front sectional view of the slit current limiting type circuit breaker in this embodiment, and FIG. 2 is a sectional view taken along line 1-1 of FIG. In these drawings, parts corresponding to those in FIG. 3 are designated by the same reference numerals.

Identification: Under normal conditions, the scraper 1 and the movable electrode 2 are in contact and are in an energized state. Therefore, when a short-circuit current flows through the circuit, the movable electrode 2 is moved in a direction away from the fixed electrode 1 by a driving device (not shown). Due to this separation movement of the movable electrode 2, an arc A is created between the identification voltage pjl and the movable electrode 2.

occurs.

This arc A1 is elongated into an arc shape with the opening operation of the movable electrode 2, and finally the arc runner electrode 3,
The arc moves to the protrusions 3a and 4a of No. 4, and becomes arc A2.

At this time, the current path is: movable electrode 2 - collector l〇 - arc runner on the movable side 4 - arc A! - arc runner electrode 3 on the fixed side - fixed electrode l - coil 6.

This coil 6 is wound around one end of an excitation magnetic body 5 surrounding the main electrodes 1 and 2 in a U-shape from the outside of an externally insulating container 11. The short-circuit current flowing through the coil 6 generates a magnetic field perpendicular to the arc A2. This orthogonal magnetic field imparts an upward force to the arc A2, which enters the boost chamber 12, which is defined by an external insulating volume of 2 ml.

This pressurization chamber 12 is a small chamber in which only the upper portions of the fixed electrode 1 and the movable electrode 2 are open. I want to, Arc A
The pressure inside the pressurizing chamber 12 increases due to the heat generated by the pressurizing chamber 12 . This internal pressure interacts with the lifting force due to the above-mentioned orthogonal magnetic field and attempts to lift the arc A2. As a result, the arc A2 is caused by the movable arc runner electrode 4. Movable side intermediate electrode 13. An arc 8 is formed that connects the intermediate electrode 14 on the fixed side and the arc runner electrode 3 on the fixed side.

This arc A3 continues to rise further and is finally inserted into the arc rotation space 15, 16. At the same time, the arc A is divided by the horn piece 8 attached to the heat-resistant arc-extinguishing plates 71, 7□, . A loop-shaped arc is formed between each horn piece 8, and each plate,
It is inserted into the gap between 1t, , 1,. The structure of the arc-extinguishing chamber is similar to that of a conventional arc-extinguishing chamber.

The current path at this time is: movable electrode 2-4 electron 10 - arc runner electrode 4 on the movable side - arc rotation drive coil 17 on the movable side - outer electrode for arc rotation on the movable side 18 - one rotation arc A4 - arc on the movable side Rotating center electrode 1i19 - Loop-shaped arc A in the arc extinguishing chamber - Center electrode for arc rotation on the fixed side 20 One rotation arc/'16 - Outer electrode for arc rotation on the fixed side 21 - Arc rotating egg on the fixed side moving coil 22-
This becomes the fixed electrode 1.

At this time, a magnetic field H is generated by the current flowing through the arc-rotating moving coil 17.22. The electromagnetic force caused by this magnetic field H is added to the self-field generated by the loop-shaped arc A inside the arc-extinguishing chamber.

Therefore, the loop-shaped arc A is further extended and the arc-extinguishing plates 71.7□, , 7. inserted into the narrower slit between
This will increase the arc voltage. As a result, the arc current is limited, and the arc current is limited.
The arc rotating in the arc space of the arc system is rapidly cooled and extinguished, and the arc A inside the arc extinguisher is also extinguished.

〔Effect of the invention〕

As explained above, in the slit current-limiting type ε-breaker of the present invention, the stone f! Since the arc rotation space is equipped with an air-driven arc rotation arc extinguishing method, the magnetic field generated by the arc rotation drive coil is generated in the same direction as the self (n field) caused by the loop-shaped arc in the arc extinguishing chamber slit. This increases the ability of arc extension in the arc extinguishing chamber slit space and promotes arc insertion into narrower slits.Therefore, a high arc voltage is generated and the current limiting effect is enhanced. In this way, according to the present invention, it is possible to downsize the arc extinguishing chamber and increase its capacity.

[Brief explanation of the drawing]

FIG. 1 shows the internal structure of a slit current limiting circuit breaker according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line I--■ in FIG. Further, FIG. 3 is a diagram illustrating a conventional circuit breaker and its arc interrupting ability. 1-Fixed electrode 2: Movable electrode 3.4: Arc runner electrode 13.14-Intermediate electrode 71.7□,,
,,7,1: γShao Arc Flea 17.22: Arc Rotation Drive Coil Patent Applicant Yaskawa Electric Co., Ltd. Agent
Child Masu (2 others) Figure 1 Figure 2 Figure 3 (a) (b) Mouth==□

Claims (1)

[Claims] 1. A pair of arc runner electrodes are arranged in parallel above a pair of fixed electrodes and a movable electrode, a pair of intermediate electrodes is further arranged between the arc runner electrodes, and an arc extinguishing plate is laminated between the intermediate electrodes. A magnetically driven rotary arc extinguisher, each equipped with an arc drive coil, is provided with a slit arc extinguisher, and a second magnetic field perpendicular to the magnetic field generated by the arc in this slit space is generated. A slit type current limiting circuit breaker characterized in that an arc portion is arranged between an arc runner electrode and an intermediate electrode.