KR20140036960A - Direct current switch and direct current circuit breaker - Google Patents

Abstract

A DC switch and a DC circuit breaker electrically isolate terminals from each other in a rapid manner, when contact points are spaced apart from each other. An arc extinguishing part (19a) corresponding to a first breaker member (30a) is installed to be apart from a second breaker member (30b), such that the first breaker member (30a) is not magnetically influenced by the second breaker member (30b) which is not subject to an arc extinguishment. Thus, an increasing effect for an arc is promoted by a permanent magnet thereby raising an arc voltage. The arc is extinguished when the arc voltage exceeds a voltage applied between a fixed contact point (21a) and a movable contact point (22a). Therefore, the movable contact points (22a, 22b) are quickly disconnected from the fixed contact points (21a, 21b) by increasing the arc voltage. [Reference numerals] (AA) Height direction; (BB) Longitudinal direction

Description

DIRECT CURRENT SWITCH AND DIRECT CURRENT CIRCUIT BREAKER}

The present invention relates to a DC switch and a DC circuit breaker.

2. Description of the Related Art A DC switchgear configured to be capable of blocking a DC converter is known (see Patent Document 1, for example). The DC switch includes a fixed contact having a fixed contact, a movable contact having a movable contact, a plurality of permanent magnets extending an arc, and a fixed contact and a movable contact in a housing made of an insulating material. It is comprised by accommodating the opening / closing mechanism part etc. which open and close operation.

The movable contact is spaced apart from the fixed contact by operating the handle so as to cut off the direct current converter. At this time, each permanent magnet attracts and divides an arc generated between both contacts. As a result, it is possible to extend the arc and further increase the arc voltage. When this arc voltage rises above a power supply voltage, it electrically disconnects between both terminals.

Japanese Patent Laid-Open No. 10-154458

For example, when it is going to cut | disconnect two poles (plus pole, minus pole) of direct current using the said DC switch, it is conceivable to arrange | position two said DC switch. In this case, the arc extinguishing portion is affected by the magnetic flux caused by the opening / closing operation of the adjacent DC switch, and there is a fear that the arc cannot be sufficiently extended. Therefore, the electrical interruption between the contacts may be delayed.

The present invention has been made to solve such a problem, and an object thereof is to provide a DC switch and a DC circuit breaker that electrically cut off the terminals more quickly when spaced between the contacts.

Hereinafter, the means for achieving the above object will be described.

In order to solve the above problems, as a plurality of blocking mechanism portions, each blocking mechanism portion includes a plurality of blocking mechanism portions including a fixed contact having a fixed contact and a movable contact having a movable contact proximate and spaced apart from the fixed contact; In the DC switchgear provided with the opening-and-closing mechanism which opens and closes the said fixed contact and the said movable contact in each said interruption | blocking mechanism part, and the extinguishing part provided corresponding to at least one of the said several interruption mechanism part, The said extinguishing part is the said movable contact point. When spaced apart from the fixed contact, a magnet that extends an arc generated between the movable contact and the fixed contact through an arc driving force, and suppresses bridging of the arc with respect to the magnet, The insulation part which consists of an insulating material is provided, The said arc part is self-extinguishing object, It is characterized in that is provided away from the other blocking mechanism wherein the spaced distance of which is not magnetically effect (磁 氣 的) from other blocking mechanism blocking the non-negative mechanism.

In the above configuration, the arc extinguishing portion is one arc extinguishing portion, and further includes another extinguishing portion corresponding to the other interrupting mechanism portion, and the separation distance includes the movable contact and the fixed contact corresponding to the one extinguishing portion. The arc driving force at the time of opening is not reduced by the magnet of the other extinguishing portion, and is magnetized collecting by the magnet of the one extinguishing portion. It is preferable that the magnetic flux is a distance which is not reduced by the other extinguishing portion.

Moreover, in the said structure, it is preferable to provide the housing which covers the said several blocking mechanism part, and the said several blocking mechanism part is arrange | positioned in a different height along the width direction of a housing.

In the above configuration, the housing includes a space adjacent to the plurality of blocking mechanism portions in the height direction and the width direction of the housing, wherein the DC switch is one of a plurality of DC switches arranged in parallel. It is preferable that the cut-off mechanism part in one DC switch of a plurality of DC switchgear, and the cut-off mechanism part in the other DC switch adjacent to the said DC switchgear sandwich the said space, and are arrange | positioned at the said separation distance. .

Moreover, in the said structure, it is preferable that the said some interruption | blocking mechanism part is arrange | positioned so that it may partially overlap in the direction orthogonal to the width direction of a housing.

Moreover, in the said structure, it is provided with the 1st terminal exposed from the said housing, and electrically connected with the said fixed contactor, and the 2nd terminal exposed from the said housing, and electrically connected with the said movable contactor, The plurality of said Preferably, a plurality of electrical circuits are formed between the plurality of first terminals and the plurality of second terminals corresponding to the shutoff mechanism, and the plurality of electrical circuits are disposed at different heights along the width direction of the housing.

Moreover, in the said structure, it is preferable to include the abnormal current interruption means which isolate | separates the said movable contact from the said fixed contact when an abnormal current flows.

According to the present invention, when the DC switchgear and the DC circuit breaker are separated from each other, the terminals can be electrically disconnected more quickly.

1 is a side view of a DC switch in one embodiment of the present invention.
FIG. 2 is a sectional view taken along line 2-2 of FIG. 1.
3 is a front view taken along line 3-3 of FIG.
4 is a back view taken along the line 4-4 of FIG. 1.
Fig. 5 is an exploded perspective view of the arc extinguishing portion of the first opening and closing portion in the embodiment of the present invention.
Fig. 6 is a cross-sectional view of the arc extinguishing portion of the first opening and closing portion in the embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment which applied the DC circuit breaker which is a kind of DC switch which concerns on this invention to a photovoltaic power generation system is demonstrated with reference to FIGS. The DC circuit breaker has a function of a DC switch.

As shown in FIG. 1, the DC circuit breaker 1 has an approximately rectangular shape and has electrical circuits 10a and 10b corresponding to plus and minus poles. The DC circuit breaker 1 is provided with the housing | casing 6, and the both ends of each electric circuit 10a, 10b have the connection terminal 11a, 11b, 12a, 12b which protruded from the housing 6. As shown in FIG.

The positive terminal (+ P1) and the negative terminal (-P1) from a solar panel (not shown) are respectively connected to the connection terminal 11a, 11b. In detail, as shown in FIG. 4, the positive terminal (+ P1) and the negative terminal (-P1) are crimped with the connection terminal 11a, 11b by the screw 7. As shown in FIG. The connection terminals 11a and 11b are provided in different positions in both the height direction and the width direction. That is, the connection terminal 11a is located on the right side in the figure of the connection terminal 11b.

3, plus terminal + P2 and minus terminal (-P2) from a power converter (not shown) are respectively connected to connection terminal 12a, 12b. In detail, the positive terminal (+ P2) and the negative terminal (-P2) are press-contacted with the connection terminals 12a and 12b by the screw 7. As shown in FIG. The connection terminals 12a and 12b are provided in different positions in both the height direction and the width direction. That is, the connection terminal 12a is located in the upper left of the figure of the connection terminal 12b. The DC circuit breaker 1 is located between the solar panel and the power converter, and switches between the energized state and the cutoff state between the solar panel and the power converter.

Next, the internal structure of the DC circuit breaker 1 is demonstrated.

As shown in FIG. 1, the DC circuit breaker 1 includes the blocking mechanism portions 30a and 30b, the handle 15, and the link mechanism 16 constituting the respective electric circuits 10a and 10b. And the solenoid 13. 1 is a side view of the DC circuit breaker 1 with the side cover removed.

As shown in FIG. 2, the blocking mechanism parts 30a and 30b are provided at two different heights along the width direction of the housing 6 of the DC circuit breaker 1, respectively. The 1st blocking mechanism part 30a is located in the upper side, and the 2nd blocking mechanism part 30b is located in the lower side. That is, it is a positional relationship similar to the said terminal 11a, 11b, 12a, 12b. And both blocking mechanism parts 30a and 30b are located so that a part may overlap when viewed from a height direction. The 1st shutoff mechanism part 30a is spaced apart from the 2nd shutoff mechanism part 30b so that it may not be influenced by the magnetic flux change which arises at the time of opening / closing operation of the 2nd shutoff mechanism part 30b.

Here, the separation that is not affected by the magnetic flux change generated during the opening and closing operation means that the magnet 32 of the arc extinguishing portion 19a does not reduce the arc driving force at the time of opening by the other magnet 35. Is generated and the magnetic flux orthogonal between the opened contacts 21a and 22a is not reduced by the other extinguishing portion 19b.

In addition, the DC circuit breaker 1 has a space 14 provided in the housing 6 on the right side of the first blocking mechanism portion 30a, that is, above the second blocking mechanism portion 30b.

As shown by the dashed-dotted line of FIG. 2, several DC circuit breakers 1 of the same structure are arrange | positioned in parallel in the same direction along the width direction. Each DC circuit breaker 1 is provided corresponding to a solar panel. In this case, the 1st shutoff mechanism part 30a in the center DC breaker 1, and the 1st shutoff mechanism part 30a in the DC adjacent circuit breaker 1 adjacent to the right side are the spaces in the DC breaker 1 of the center ( 14 is spaced apart by a distance L1.

Moreover, the 1st interruption | blocking mechanism part 30a (shown by the solid line of FIG. 2) in the center DC circuit breaker 1, and the 1st interrupting mechanism part 30a (2 of FIG. The dashed-dotted line) sandwiches the space 14 in the left adjacent direct current circuit breaker 1, and is spaced apart by the distance L1. This distance L1 is set so that the influence of the magnetic flux change which arises at the time of opening / closing operation | movement of a cutoff mechanism part can be disregarded.

As shown in FIG. 1, each interruption | blocking mechanism part 30a, 30b is equipped with the fixed contact 17a, 17b and the movable contact 18a, 18b. Corresponding portions 19a and 19b are provided corresponding to the blocking mechanism portions 30a and 30b.

As for the handle 15, the operation part 15a is exposed to the outside. In addition, the link mechanism 16 supports a part of the movable contacts 18a and 18b and moves the movable contacts 18a and 18b in the height direction in accordance with the rotation of the handle 15. This link mechanism 16 corresponds to an opening and closing mechanism.

The movable contacts 18a and 18b have a thin plate shape extending in the longitudinal direction (left and right directions in the drawing) and are electrically connected to the connection terminals 12a and 12b, respectively. The movable contacts 18a and 18b respectively have movable contacts 22a and 22b provided on the lower surface of the right end of the movable contacts 18a and 18b.

The fixed contacts 17a and 17b have a thin plate shape extending in the longitudinal direction (left and right directions in the drawing) similarly to the movable contacts 18a and 18b, and the right ends thereof constitute the connection terminals 11a and 11b.

In addition, the fixed contact 17a, 17b has the fixed contact 21a, 21b provided in the upper surface of the left end part of the fixed contact 17a, 17b. The movable contacts 22a and 22b are provided so as to be close to and spaced apart from the fixed contacts 21a and 21b as the movable contacts 18a and 18b move up and down.

The solenoid 13 operates the link mechanism 16 via the output shaft 13a when an overcurrent (abnormal current) flows through the electric circuit 10a. Thereby, the movable contact 22a is spaced apart from the fixed contact 21a, and overcurrent is interrupted | blocked. That is, the solenoid 13 is corresponded to abnormal current interruption means.

The arc extinguishing parts 19a and 19b corresponding to each interruption | blocking mechanism part 30a, 30b are a different structure. First, the structure of the extinguishing part 19a corresponding to the 1st shutoff mechanism part 30a is demonstrated.

As shown in FIG. 5, the extinguishing portion 19a corresponding to the first interruption mechanism portion 30a includes a magnetic yoke 31, a pair of permanent magnets 32, and an insulating holder 33. It is provided.

Each permanent magnet 32 has a square flat plate shape, and the S pole and the N pole are magnetized in the thickness direction thereof.

The insulating holder 33 has a substantially U-shape opened downward in the drawing. In detail, the insulation holder 33 is comprised from the pair of side walls 33a and 33b and the upper wall 33c which connects the side walls 33a and 33b. The side walls 33a and 33b are formed on the outer surfaces of the side walls 33a and 33b and have a storage hole 33d to which the permanent magnet 32 can be mounted.

The magnetic yoke 31 is made of a magnetic material such as ferrite and has a U shape so as to cover the outer surface of the insulating holder 33. The magnetic yoke 31 forms a path between the two permanent magnets 32.

The permanent magnet 32 is fitted into each of the storage holes 33d of the insulating holder 33. Then, the magnetic yoke 31 is inserted into the insulating holder 33 from the outside. Thereby, the extinguishing part 19a is assembled. The movable contact 22a and the fixed contact 21a are located inside the extinguishing portion 19a.

Next, the structure of the extinguishing part 19b corresponding to the 2nd interruption | blocking mechanism part 30b is demonstrated.

As shown in FIG. 2, the extinguishing part 19b corresponding to the 2nd interruption | blocking mechanism part 30b has a pair of permanent magnet 35 which is the same shape as the said permanent magnet 32. As shown in FIG. Both permanent magnets 35 sandwich the movable contact 18b and the fixed contact 17b to face each other in the width direction.

Next, the operation of the DC circuit breaker 1 will be described.

As shown in FIG. 1, the movable contacts 18a and 18b are spaced apart from the fixed contacts 17a and 17b through the handle 15 in a state where current flows in both electric circuits 10a and 10b. At this time, as shown in FIG. 6, an arc occurs between the fixed contacts 21a and 21b and the movable contacts 22a and 22b.

The permanent magnet 32 in the first shutoff mechanism portion 30a extends the arc by applying a Lorentz force to the arc generated between the contacts 21a and 22a by electrodynamics. This Lorentz force becomes the arc driving force for driving the arc. At this time, the insulating holder 33 has the function of the insulating part which protects the permanent magnet 32 and the magnetic yoke 31 so that an arc may not interfere with the permanent magnet 32 and the magnetic yoke 31. By extending the arc, the arc voltage can be increased. The arc is extinguished when this arc voltage exceeds the applied voltage between the fixed contacts 21a and 21b and the movable contacts 22a and 22b. Therefore, the contact 21a, 22a is in the state electrically disconnected.

The permanent magnet 35 in the second shutoff mechanism portion 30b similarly extinguishes the arc by extending the arc. Accordingly, the contacts 21b and 22b are also electrically disconnected.

As described above, according to the described embodiment, the following effects can be obtained.

(1) The extinguishing portion 19a corresponding to the first interrupting mechanism portion 30a is not subject to magnetic influence from the second interrupting mechanism portion 30b, which is not an object to be extinguished. It is provided spaced apart from the said 2nd shutoff mechanism part 30b. Therefore, it is possible to increase the effect of stretching the arc through the permanent magnet 32, that is, increase the arc voltage. The arc is extinguished when the arc voltage exceeds the applied voltage between the fixed contact 21a and the movable contact 22a. Therefore, by increasing the arc voltage, the interruption between the movable contact 22a and the fixed contact 21a can be performed more quickly.

(2) As shown in FIG. 1, each cutoff mechanism part 30a, 30b is arrange | positioned at a different position, ie, a step, when seen from the width direction of the housing 6. Therefore, the extinguishing part 19a corresponding to the 1st interruption | blocking mechanism part 30a can be spaced apart from the 2nd interruption mechanism part 30b, without increasing the size of the DC circuit breaker 1 in the width direction.

(3) The blocking mechanism parts 30a and 30b are disposed so as to partially overlap when viewed from the height direction. Therefore, the length in the width direction of the housing 6 of the DC circuit breaker 1 can be shortened.

In particular, in the said embodiment, as shown in FIG. 2, the DC circuit breaker 1 of the same structure is arranged in multiple numbers in the width direction. The whole size at the time of arranging this DC circuit breaker 1 can be made compact. In addition, the blocking mechanism parts 30a of adjacent DC circuit breakers 1 are spaced apart by the distance L1 through the space 14. Therefore, even when the DC circuit breaker 1 is arrange | positioned adjacently, the effect of said (1) is acquired.

(4) The electrical circuits 10a and 10b including the terminals 11a, 11b, 12a, and 12b are arranged so as not to overlap each other in the width direction, that is, with a step. Therefore, the width direction of the DC circuit breaker 1 can be formed thin.

Further, even when each terminal 11a, 11b, 12a, 12b is formed large in the width direction, the terminals 11a, 11b, 12a, 12b are not adjacent to each other, so that the terminals do not interfere with each other. Therefore, the terminals 11a, 11b, 12a, and 12b can be formed larger. Thus, by using the larger size screw 7, the terminals (+ P1), (-P1), (+ P2), (+) from the outside to the connection terminals 11a, 11b, 12a, 12b of the DC circuit breaker 1 ( -P2) can be pressed with greater force.

(5) When an overcurrent (abnormal current) flows through the electric circuit 10a, the movable contact 22a is separated from the fixed contact 21a through the solenoid 13, and the overcurrent is interrupted. Therefore, safety as a photovoltaic power generation system becomes high.

And the said embodiment can be implemented with the following forms which changed this suitably.

* In the said embodiment, although the DC circuit breaker 1 was arranged in multiple numbers in the width direction, the arrangement method is not limited to this and may be used independently.

* In the said embodiment, although two extinguishing parts 19a and 19b were provided in one DC circuit breaker 1, the extinguishing part 19b corresponding to the 2nd interruption | blocking mechanism part 30b is abbreviate | omitted, for example. You may also

In addition, the structure of the arc extinguishing parts 19a and 19b can also be changed suitably. For example, the magnetic yoke 31 may be omitted from the extinguishing portion 19a.

In the above embodiment, the positive terminal (+ P1) and the negative terminal (-P1) of the solar panel (not shown) were connected to the connection terminals 11a and 11b, respectively. However, you may connect only the positive terminal from each photovoltaic panel (not shown), or only the negative terminal to the connection terminal 11a, 11b of each electric circuit 10a, 10b. The same applies to the connection terminals 12a and 12b. In addition, you may use the connection terminal 11a, 11b and the connection terminal 12a, 12b reversely.

In the above embodiment, the DC circuit breaker 1 has two electric circuits 10a and 10b, but may have three or more electric circuits. Also in this case, the effect similar to the said Embodiment 1-Embodiment 4 is acquired by arrange | positioning each electric circuit with a step (that is, arrange | positioning so that each electric circuit may not overlap when it sees from the width direction).

* In the said embodiment, although it arrange | positioned so that a part of cutoff mechanism part 30a, 30b may overlap in view from a height direction, all of the cutoff mechanism part 30a, 30b may overlap. In addition, both blocking mechanism parts 30a and 30b may be arrange | positioned in a line view from the width direction. In this case, the DC circuit breaker 1 has a space spaced apart by the distance L1 between the two disconnecting mechanism parts 30a and 30b. In addition, the electrical circuits 10a and 10b including the blocking mechanism parts 30a and 30b may be arranged in a line when viewed in the width direction.

* In the said embodiment, although the DC circuit breaker 1 was connected to the solar panel, you may connect the DC circuit breaker 1 to another DC voltage source.

By omitting the solenoid 13 in the said embodiment, you may comprise as a DC switch instead of a DC circuit breaker.

* Although the arc extinguishing parts 19a and 19b are made into different structures, you may employ | adopt either structure.

Next, the technical idea grasped | ascertained from the said embodiment is demonstrated with the effect.

(A) The DC switchgear according to any one of claims 2 to 4, wherein a plurality of shutoff mechanism portions are simultaneously opened and closed by the common handle via the opening and closing mechanism.

One… DC circuit breakers, 10a, 10b... Electrical circuits 11a, 11b, 12a, 12b... Connection terminal, 14... Space, 15... Handle, 15a... 16,. Link mechanism, 17a, 17b... Fixed contacts, 18a, 18b... Operation contactor, 19a, 19b ... Sub-division, 21a, 21b... Fixed contacts, 22a, 22b... Movable contact, 30a... First shutoff mechanism portion 30b... Second shutoff mechanism portion; Magnetic yoke, 32... Permanent magnet, 33... Insulated holder, 33a, 33b... Sidewall, 33c... Upper wall, 33d... Storage hole, 35... Permanent magnets.

Claims (7)

A plurality of blocking mechanism portions, each of the blocking mechanism portions comprising: a plurality of blocking mechanism portions having a fixed contact having a fixed contact and a movable contact having a movable contact proximate and spaced apart from the fixed contact;
An opening / closing mechanism for opening and closing the fixed contact point and the movable contact point in each of the blocking mechanism parts; And
A fire extinguishing unit provided corresponding to at least one of said plurality of blocking mechanism units;
In the DC switch comprising a,
The extinguishing unit,
A magnet configured to extend an arc generated between the movable contact and the fixed contact through an arc driving force when the movable contact is spaced apart from the fixed contact; And
An insulating portion made of an insulating material, which suppresses the arcing of the arc with respect to the magnet;
Lt; / RTI >
The said arc-extinguishing part is provided spaced apart from the said other interruption mechanism part by the distance which is not influenced magnetically from the interruption | blocking mechanism part other than the said interruption mechanism part which is the object to be extinguished,
DC switchgear. The method of claim 1,
The said callout part is one callout part, and further includes another callout part corresponding to said other blocking mechanism part,
The separation distance does not reduce the arc driving force at the time of opening the movable contact and the fixed contact corresponding to the one extinguishing portion by the magnet of the other extinguishing portion, and further, the magnet of the one extinguishing portion. The DC switchgear which is the distance which the magnetic flux between the said open | released both contact | aggregated by the collector is not reduced by the said other arc part. 3. The method according to claim 1 or 2,
And a housing covering the plurality of blocking mechanism portions, wherein the plurality of blocking mechanism portions are disposed at different heights along the width direction of the housing. The method of claim 3,
The housing includes a space adjacent to the plurality of blocking mechanism portions in the height direction and the width direction of the housing,
The DC switch is one of a plurality of DC switch arranged in parallel,
The DC switchgear provided with the cut-off mechanism part in one DC switch of the said several DC switchgear, and the cut-off mechanism part in the other DC switchgear adjacent to the said DC switchgear with the said space | interval space being sandwiched. 5. The method of claim 4,
The DC switchgear provided with the said some interruption | blocking mechanism part partly overlapping in the direction orthogonal to the width direction of the said housing. The method according to claim 4 or 5,
A first terminal exposed from the housing and electrically connected to the fixed contact;
A second terminal exposed from the housing and electrically connected to the movable contact;
A plurality of electrical circuits are formed between the plurality of first terminals and the plurality of second terminals corresponding to the plurality of blocking mechanism portions,
And the plurality of electrical circuits are disposed at different heights along the width direction of the housing. The DC circuit breaker which is a kind of the DC switch as described in any one of Claims 1, 2, 4-6, The abnormality which isolate | separates the said movable contact from the said fixed contact when an abnormal current flows. DC circuit breaker comprising a current interrupting means.

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