JP3239546B2 - Circuit breaker current detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detector for a circuit breaker which forcibly opens a contact when an abnormal current such as a ground fault current or a short-circuit current flows between the input / output terminals of the circuit breaker.

[0002]

2. Description of the Related Art In general, in a current detecting device for a circuit breaker of this type, a number of conductive plates corresponding to the number of poles of the circuit breaker are provided, and each fixed iron core and each movable iron core are provided. Are sandwiched between these individual conductive plates so as to freely contact and separate from each other, and each movable iron core is spring-biased in a direction of opening from each fixed iron core.

In this current detecting device, when an abnormal current such as a ground fault current or a short-circuit current flows through a conductive plate, each movable iron core is attracted to each fixed iron core by a magnetic field generated by the current, and a circuit breaker is pulled. It is possible to forcibly open the contact by rotating the release member to break the equilibrium state of the link.

[0004]

Generally, in a circuit breaker using this current detecting device, it is necessary to prevent a contact from being forcibly opened by a rush current generated when a voltage is applied to a load. For this purpose, the current value for forcibly opening the contact by adjusting the distance between each movable iron core and each fixed iron core is adjusted.

However, in the above-described current detecting device for a circuit breaker, since the fixed iron core and the movable iron core are provided for each pole of the circuit breaker, each movable iron core and each fixed iron core are provided. When adjusting the current value by displacing the distance between them, the movable iron core and / or the fixed iron core must be adjusted for each pole, and the current value for forcibly opening the contacts of the circuit breaker must be adjusted. There was a problem that the adjustment work was very troublesome.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to adjust a current value that can be attracted to each fixed iron core by each movable iron core. An object of the present invention is to provide a current detection device for a circuit breaker, in which a fixed iron core can be adjusted simultaneously for all poles, thereby facilitating a work of adjusting a current value for forcibly opening a contact of the circuit breaker.

[0007]

According to a first aspect of the present invention, there is provided a current detecting device for a circuit breaker, comprising: a plurality of conductive plates interposed between input and output terminals of the circuit breaker;
Each fixed iron core and each movable iron core opposing each other so as to be able to freely contact and separate each other while sandwiching these conductive plates, and a return spring for urging each movable iron core in a direction of opening from each fixed iron core. In the current detecting device for a circuit breaker provided to break the balance of a link and force-open a contact when an abnormal current flows between input and output terminals, each of the fixed iron core and the movable iron core is a first The first housing member and the second housing member are housed in the housing member and the second housing member, and the distance between at least one of the first housing member and the second housing member to the other side is adjustable.

According to a second aspect of the present invention, the return spring of the first aspect is arranged such that the return spring is disposed between each conductive plate and each movable iron core.

According to a third aspect of the present invention, there is provided a current detecting device for a circuit breaker, wherein the distance between the first housing member and the second housing member is adjustable.

According to a fourth aspect of the present invention, there is provided a current detecting device for a circuit breaker, wherein the first storage member is provided between the first storage member and the second storage member according to any one of the first to third aspects. And a positioning spring for pressing the spring is provided.

According to a fifth aspect of the present invention, there is provided a current detecting device for a circuit breaker, wherein an inclined surface is formed in the first housing member of the fourth aspect, and the inclined surface is formed between the first housing member and the case back surface of the circuit breaker. And an adjusting member that is movably abutted along the axis, and the adjusting member is held on the back surface of the case so that the position at which the adjusting member abuts on the inclined surface can be adjusted in several steps.

According to a sixth aspect of the present invention, there is provided a current detecting device for a circuit breaker, wherein the adjusting member according to the fifth aspect is configured such that an operating body inserted into a hole formed in a case of the circuit breaker contacts the case back surface and the inclined surface. And an adjusting body that contacts the operating body, and the operating body and the adjusting body are fitted and attached.

[0013]

According to the structure of the first aspect, the distance between the fixed iron core and the movable iron core of all the poles can be adjusted by adjusting the distance between the first storage member and the second storage member. it can.

According to the second aspect of the invention, in addition to the function of the first aspect, after the return spring is disposed between the movable iron core of the second storage member and the conductive plate in the case of the circuit breaker, One storage member can be provided.

According to the third aspect, in addition to the function of the second aspect, the distance between the movable iron core and the fixed iron core can be adjusted without compressing the return spring.

According to the structure of the fourth aspect, in addition to the functions of the first to third aspects, the first storage member is moved toward the second storage member by an impact when the movable iron core is opened from the fixed iron core. The first housing member is pressed by the positioning spring toward the back surface of the cover of the circuit breaker.

According to the fifth aspect, in addition to the operation of the fourth aspect, when the adjusting member is operated along the inclined surface of the first storage member, the first storage member is moved to the second storage position by the contact position of the inclined surface. 2 It is held while approaching or leaving the storage member.

According to the configuration of the sixth aspect, when the operating body is adjusted from outside the case of the circuit breaker, the adjusting body in the case moves along the inclined surface of the first housing member and the first housing member is moved to the first housing member. 2. The adjusting body is held on the back surface of the case while approaching or separating from the storage member.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. That is, the current detecting device of this circuit breaker includes a conductive plate 1, fixed iron cores 2 and movable iron cores 3.
And a return spring 4.

As shown in FIG. 1, the conductive plate 1 has a substantially U-shaped insertion portion 5 and a flat plate-like held portion 6 connected to the insertion portion 5, and the three are formed as a set. Each insertion part 5,5,
5 is inserted into the zero-phase current transformer 7. The insertion portion 5 has a screw hole 5c whose base end 5a serves as an output terminal of a circuit breaker to be described later and into which a terminal screw is screwed. The insertion portion 5 is bent from the base end 5a and freely inserted into the zero-phase current transformer 7. The clamped portion 6 is continuously provided by welding to a distal end 5b which sandwiches the zero-phase current transformer 7 with the base end 5a. The clamped portion 6 has a base end 6a connected to the insertion portion 5, has a fixing screw hole 6c at a distal end 6b, and can be fixed to the case 30 of the circuit breaker by a screw. Also, this pinched portion 6
A bimetal 8 is attached at the center of the contact, and when an overcurrent flows, the contact is forcibly opened by deforming and pressing a tripping member described later to break the equilibrium state of the link.

The fixed iron core 2 is formed in a substantially concave shape when viewed from the front, and is fixed to the first storage member 19 with screws 10 by a number corresponding to the number of poles of the circuit breaker. Each movable iron core
3 are arranged facing each other so that they can come and go freely. The first accommodating member 19 is formed of an insulating material such as plastic and has a substantially goodwill shape.
Is provided, and an operation piece 19b (inclined surface) is provided on the upper surface. The fixing piece 19a has a screw hole formed substantially at the center thereof, and fixes each fixed iron core 2 with the screw 10. The operation piece 19b is provided in an inclined state at a position between the fixed pieces 19a, and the movable member of the fixed iron core 2 is moved by moving the adjusting member 11 in a state of being in contact with the inclined surface 19b. The distance from 3 can be adjusted. The first storage member 19 has an insertion piece 19 held in a state of being inserted into a second storage member described later.
c, and the insertion piece 19c is
Is loosely pressed to press the first storage member 19 toward the back surface of the case 30 of the circuit breaker. When the movable iron core 3 is opened from the fixed iron core 2, the first storage member 19 2 It is possible to prevent flying in the direction of the storage member, and the opening and closing operations of the fixed iron core 2 and the movable iron core 3 are stabilized.

The adjustment member 11 movably abuts along the inclined surface between the first storage member 19 and the back surface of the circuit breaker case 30 and is formed on a circuit breaker case 30 described later. The operating body 13 is inserted into the hole 31 and the adjusting body 14 is in contact with the rear surface of the case 30 and abuts on the inclined surface 19b. The operating body 13 and the adjusting body 14 The distance between the fixed iron core 2 and the movable iron core 3 can be adjusted. The operating body 13 includes a locking portion 15 that can be locked to the outer surface of the case 30 and an operating portion 16 that is movably disposed on the locking portion 15. By moving the shooting into the operation hole 15a of the
Can be moved along the inclined surface 19b, and the distance between the first storage member 19 and the second storage member can be adjusted.

The locking portion 15 is formed in a plate shape and has an operation hole 15a through which the operation portion 16 can be moved.
A mark is silk-printed on the locking portion 15 near the operation hole 15a, so that the moving amount of the operation portion 16 can be recognized at a glance. Further, below the locking portion 15,
A fitting piece 15b is provided and can be fitted and fixed in a groove 32 formed in the case 30. The operation unit 16 is movably locked to the operation hole 15 of the locking unit 15 by shooting 16a,
The fitting body 16 is fitted and attached to the adjustment body 14 by the fitting projection 16b.

The adjusting body 14 is fitted to and attached to the operating section 16 of the operating body 13, and the adjusting body 14 is connected to the adjusting body main body 17 and is engaged with the back surface of the case 30 so as to be fitted and recessed. And a locking piece 18. The adjusting body main body 17 forms a fitting concave portion 17a into which the fitting convex portion 16b of the operating portion 16 fits, and the first
Contact projections 17b, 17b are formed to contact the inclined surface 19b of the storage member 19, so that the operation section 16 can be taken from outside
By adjusting the distance, the contact protrusions 17b, 17b of the adjustment body 14 move along the inclined surfaces 19b, 19b, and the first storage member 19 can be moved closer to or farther from the second storage member. At this time, the first storage member 19 can be held by the engagement piece 18 of the adjusting body 14 being fitted into the back surface of the case 30 in an uneven manner.

The movable iron core 3 is formed in a substantially concave shape similarly to the fixed iron core 2, and is housed in the second housing member 20 so as to face the fixed iron core 2 with the conductive plate 1 interposed therebetween. Further, the movable iron core 3 is provided with a plate-shaped pressing piece 3a, and an abnormal current such as a ground fault current or a short-circuit current flows and is attracted to the fixed iron core 2 so that a circuit breaker to be described later is formed. It is possible to forcibly open the contact by pressing the tripping member. The second storage member 20 is formed of an insulating material such as plastic, and has a second storage member main body 21 for storing the movable iron core 3 and a zero-phase current transformer 7 connected to the second storage member main body 21. And a separation portion 22 (separation wall) inserted through the separation portion 22.

The second storage member main body 21 has a storage portion 23 having a slide groove 23a for slidably holding the movable iron core 3.
And an insertion hole 24 into which the insertion piece 19c of the first storage member 19 is inserted. The fixed iron core 2 described above is also slidably disposed in the slide groove 23a of the storage section 23. That is, the insertion piece 19c of the first storage member 19 is
By inserting the first storage member 19 and the second storage member 20 in series by inserting them into the insertion holes 24 of the storage member 20, the fixed iron core 2 can be stored in the storage portion 23.
Separation section 22 (separation wall) is connected to zero-phase current transformer
In the zero-phase current transformer 7, the insertion part 5 of the conductive plate 1 can be separated for each conductive plate 1 so that insulation between the conductive plates 1 can be ensured. In addition to this, the insertion portion 5 of each conductive plate 1 can be held at a more stable fixed position.

An abnormal current such as a ground fault current or a short-circuit current flows through the conductive plate 1 and the abnormal current stops flowing from the state where the movable iron core 3 is attracted to the fixed iron core 2, and the circuit breaker operates normally. Therefore, it is necessary to open the movable iron core 3 from the fixed iron core 2. For this purpose, a return spring 4 is provided to urge the movable iron core 3 in a direction to open the pole from the fixed iron core 2.
This return spring 4 has one side thereof to be clamped by each conductive plate 1.
6, the other side is disposed in contact with the recessed portion of the movable iron core 3, respectively. The movable iron core 3 and the conductive plate 1 of the second storage member 20 are disposed in the case 30 of the circuit breaker. Since the first storage member 19 can be disposed after the return spring 4 is disposed therebetween, the operation of disposing the first storage member 19 in the case 30 of the circuit breaker becomes easy.

This current detecting device, as shown in FIG.
When an abnormal current flows in the conductive plate 1 in the direction shown in FIG. 1A, a magnetic field W is generated by the current. As a result, the fixed iron core 2 and the movable iron core 3 have polarities as shown in the figure, and the movable iron core 3 is attracted to the fixed iron core 2.

Next, a circuit breaker using the current detecting device will be described with reference to FIGS. As shown in FIG. 8, the case 30 includes a lower case 30a for accommodating each member, and an upper case 30b for concealing each member with the operation handle 31 protruded. The above-described current detection device is housed inside. The inside of the case 30 is provided with input / output terminals at both ends. The output terminal is formed of the conductive plate 1 as described above. The circuit breaker includes an open / close mechanism 32 connected to an operation handle 31 that can be operated from the outside, a movable contact 33 connected to the open / close mechanism 32, and a movable contact provided on the movable contact 33. The contact device 34 includes a contact device 34a and a fixed contact 34b that can freely move toward and away from the movable contact 34a, and a tripping member 36 that breaks the equilibrium state of the link 35 of the opening and closing mechanism 32.

The tripping member 36 is normally biased by a tension spring 37 in a direction to keep the link 35 in a balanced state. However, when an abnormal current flows between the input and output terminals, the tripping member 36 is pulled. The contact 34 is forcibly opened by rotating counterclockwise in FIG. 8 against the spring force of the spring 37. That is, when an abnormal current such as an overcurrent flows, the tripping member 36 is pressed in the counterclockwise direction by the contact screw 8a of the bimetal 8, thereby breaking the equilibrium state of the link 35 and forcibly opening the contact 34. Further, when an abnormal current such as a short-circuit current or a ground fault current flows, the movable iron core 3 of the current detecting device is attracted to the fixed iron core 2, as shown in FIG. When the pressing piece 3a presses the tongue piece 36a of the tripping member 36 in the counterclockwise direction in FIG. 8, the equilibrium state of the link 35 is broken and the contact 34 can be forcibly opened.

According to the present embodiment, the first storage member for storing the fixed iron core is adjustable. However, the second storage member for storing the movable iron core is adjustable, and the first storage member and the first storage member can be adjusted. Both of the second storage members may be adjustable. Further, according to the present embodiment, both the fixed iron core and the movable iron core are formed in a concave shape, but the fixed iron core and the movable iron core are easily adsorbed by forming one of them in an I shape. If applicable. Furthermore, the size of the fixed iron core and the movable iron core
What is necessary is just to design suitably according to the width of the conductive plate of each pole.

[0032]

According to the present invention, the fixed iron core and the movable iron core of all the poles are adjusted by adjusting the distance between the first housing member and the second housing member. Since the distance between them can be adjusted, the work of adjusting the current value for forcibly opening the contacts of the circuit breaker becomes easy.

According to the current detecting device for a circuit breaker according to the second aspect, after the return spring is disposed between the movable iron core of the second storage member and the conductive plate in the case of the circuit breaker, the first storage is performed. Since the members can be disposed, the operation of disposing the members in the case of the circuit breaker becomes easy in addition to the effect of the first aspect.

According to the current detecting device for a circuit breaker according to the third aspect, the distance between the movable iron core and the fixed iron core can be adjusted without compressing the return spring. Hard to change, in addition to the effect of claim 2,
The current value for forcibly opening the contacts of the circuit breaker becomes stable.

According to the current detecting device for a circuit breaker of the present invention, even if the first storage member attempts to fly in the direction of the second storage member due to an impact when the movable iron core is opened from the fixed iron core,
Since the first housing member is pressed by the positioning spring toward the back surface of the cover of the circuit breaker, the opening and closing operation of the movable iron core and the fixed iron core is stabilized in addition to the effects described in the first to third aspects. .

According to the circuit breaker current detecting device of the fifth aspect, when the adjusting member is operated along the inclined surface of the first storage member, the first storage member is moved to the second storage position depending on the contact position of the inclined surface. Since the member is held close to or away from the member, the distance between the movable iron core and the fixed iron core can be adjusted with a simple configuration in addition to the effect described in the fourth aspect.

According to the circuit breaker current detecting device of the present invention, when the operating body is adjusted from outside the case of the circuit breaker, the adjusting body in the case moves along the inclined surface of the first housing member. Since the adjusting body is held on the back surface of the case in a state where the first storage member approaches or separates from the second storage member, the distance between the movable iron core and the fixed iron core is cut off by the circuit in addition to the effect of claim 5. Adjustment can be performed without opening the case of the circuit breaker, and the work of adjusting the current value for forcibly opening the contacts of the circuit breaker is further facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state where the conductive plate of FIG. 1 is sandwiched between first and second storage members.

FIG. 3 is a partial perspective view showing a state where the device shown in FIG. 2 is incorporated in a case of a circuit breaker.

FIG. 4 is a front view of FIG. 3 as viewed from a bimetal direction.

FIG. 5 is a side view of that of FIG.

FIG. 6 is a front view showing the zero-phase current transformer and the conductive plate of FIG.

FIG. 7 is an explanatory view showing a method in which a movable iron core is attracted to a fixed iron core by a magnetic field generated by the conductive plate of FIG. 1;

FIG. 8 is a sectional view showing a circuit breaker incorporating the one shown in FIG.

FIG. 9 is a top view showing a state where the upper case of FIG. 8 is removed.

[Explanation of symbols]

 1 conductive plate 2 fixed iron core 3 movable iron core 4 return spring 19 first storage member 20 second storage member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-47-7027 (JP, A) Jiko 9751 (JP, Y1) Jiko 39-3060 (JP, Y1) (58) Field (Int.Cl. ⁷ , DB name) H01H 83/02 H01H 71/74

Claims (6)

(57) [Claims] A plurality of conductive plates interposed between input / output terminals of a circuit breaker, and fixed iron cores and movable iron cores opposed to each other so as to be able to contact and separate each other while sandwiching these conductive plates. A return spring that urges each movable iron core in a direction of opening from each fixed iron core. When an abnormal current flows between the input and output terminals, the link is broken and the contacts are forcibly opened. In the current detection device for a circuit breaker, the fixed iron core and the movable iron core are respectively stored in a first storage member and a second storage member, and at least one of the first storage member and the second storage member is the other. A current detection device for a circuit breaker, characterized in that the distance to the side is adjustable. 2. The current detection device for a circuit breaker according to claim 1, wherein said return spring is disposed between each conductive plate and each movable iron core. 3. The distance between the first storage member and the second storage member is adjustable.
The current detection device for a circuit breaker according to claim 1. 4. A positioning spring disposed between said first storage member and said second storage member, said positioning spring pressing said first storage member in the direction of the case back surface of said circuit breaker.
The current detecting device for a circuit breaker according to claim 3. 5. An adjusting member which forms an inclined surface in said first housing member and is provided between said first housing member and a case back surface of said circuit breaker so as to movably contact along said inclined surface. 5. The current detecting device for a circuit breaker according to claim 4, wherein an adjusting member is held on a back surface of the case so that a position of the contacting member with the inclined surface can be adjusted in several steps. 6. The adjusting member includes an operating body inserted into a hole formed in a case of the circuit breaker, and an adjusting body that contacts a back surface of the case and abuts on the inclined surface. 6. The current detection device for a circuit breaker according to claim 5, wherein the current detection device is fitted and attached.