JPH11251167A - Through-type current detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a through-type current detector by which dropping of core due to incorrect usage can be prevented and insulation to power line be improved. SOLUTION: A supporting part 11A for supporting the lower side of the base end of a signal line 8 is projected from the front end of a case IA having a U-shaped vertical cross section. Receiving parts 9 are formed symmetrically on both sides of the upper end of the case IA, and the rear part of a lower core holder attached with a lower core is inserted from the upper side to a clearance between the receiving parts 9. A retaining part 15A to press down the base end of the signal line 8 from the upper side is projected from the front end of the lower core holder. The upper core holder attached with the upper core on its circumference is inserted into the inside of a semicircular upper cover 12 which is formed with a hinge part in between, from the outer surface side of the left-side receiving part 9. A power line 17 in which a current to be measured flows is inserted between the upper and lower core holders.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through current detector for measuring a measured current from a magnetic field generated by the measured current.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing an example of a conventional through-type current detector, in which a cover side is opened. In FIG. 6, the left case 20 is made of a common resin mold together with the right cover 21 of the thin hinge portion 22 formed at the right end of the case 20.

[0003] A pair of cores 23 are accommodated in front of the inside of the left case 20 through a gap 25 shown by a broken line, and is fixed to the case 20 with an adhesive. A hall element (not shown) is inserted in advance in the gap 25, and this hall element is
The printed circuit board (not shown) inserted into the case 20 is soldered.

A power line (not shown) through which a current to be measured flows is
The pair of cores 23 is inserted in contact with a groove formed in the center of the core 23. The signal line 8 is inserted from the rear of the case 20 and the outer peripheral surface of the jacket is bonded to the insertion portion of the case 20 with an adhesive.
Are soldered to through-hole terminals of a printed circuit board.

When the cover 21 is also housed inside the cover 21 and is bonded with an adhesive, and the cover 21 is overlaid on the case 20, both poles of the core 24 are overlaid on both poles of the core 23.

[0006] At the right end of the cover 21, a hook portion 21 a to be locked by a locking portion of the case 20 is provided to protrude. This through-type current detector is used by being hung on a power line inserted between the cores 23 and 24. A power measuring device (not shown) is connected to the other end (not shown) of the signal line 8, and the power measuring device is suspended from the power line via the signal line 8 and the current detector.

This through current detector is used for the R and T phases on the load side of a plurality of circuit breakers mounted on a power receiving board. Therefore, a voltage line is connected between the voltage terminal of the power measuring device and the circuit breaker.

[0008]

However, in the feed-through type current detector constructed as described above, the bonding force of the adhesive bonding the end of the signal line to the insertion portion of the case 20 can be used for a long time. If it falls down, the joint may be peeled off by the load of the power measuring device when the power line vibrates.

Then, since the load of the power measuring device is applied to the soldered portion of the core wire, for example, there is a possibility that the load will come off at the soldered portion of the core wire. In addition, if the power line is erroneously used for a bare power line, the voltage of the power line is applied to the Hall element and the printed board via the core 23, so that the insulation of these printed boards may be broken.

Also, if the power line is inserted and the power line is accidentally dropped in an open state as shown in FIG. 5, the cores 23 and 24 having reduced adhesive strength may fall off. Therefore,
An object of the present invention is to provide a through-type current detector that can eliminate the possibility of core falling off and increase the insulation from a power line.

[0011]

According to a first aspect of the present invention, there is provided a through-type current detector, wherein a groove into which an outer periphery of a printed circuit board on which a Hall element is mounted is inserted is formed on an inner periphery, and is received on both sides on an opening side. The case is formed with a support part that supports one side of the signal line connected to the printed circuit board and is provided on one side, and a groove part is formed on the outer surface of the receiving part on the other side via a hinge and a groove part is formed inside and at the tip A cover in which a knob is extended, a pair of a pair of protrusions formed on the inside and formed with a holding portion that is inserted into the opening side of the case and presses one side of the signal wire and that is formed on the inner side to face the lower surface of the measured wire. A lower core holder supporting a pair of cores with guide claws, and an arc-shaped core mounted on the outer periphery inserted into the groove of the cover via the claws and a groove formed on the inner periphery to face the upper surface of the electric wire to be measured. And a core holder. That.

In addition, a through current detector according to a second aspect of the present invention has a plurality of projections which are pressed against the sheath of the signal line on the inner periphery of the supporting portion of the case and the pressing portion of the lower core holder. Further, a claw portion for engaging with the groove of the core is protruded from the tip of the guide claw of the lower core holder.

[0013] In the through current detector according to the present invention, a hook protrudes from the outer surface of the receiving portion on one side of the case, and a fitting hole for fitting the hook is formed in a knob of the cover. It is characterized by having done.

In addition, a through-type current detector according to a fourth aspect of the present invention is characterized in that a plurality of holding portions are protrudingly provided on the inner periphery of both ends of the groove of the lower core holder and the groove of the upper core holder.

Furthermore, a through-type current detector according to a fifth aspect of the present invention is characterized in that a sphere supporting portion through which a signal line passes is provided between the supporting portion of the case and the pressing portion of the lower core holder. .

According to the invention according to the first aspect, insulation between the electric wire to be measured and the upper and lower cores is ensured by the upper core holder and the lower core holder. One side of the signal line is fixed by the convex portion formed on the portion and the holding portion of the lower core holder.

In the invention corresponding to the third aspect, the cover can be fixed to the case with one touch. In the invention corresponding to the fourth aspect, the thin measuring object wire is provided by the upper and lower holding portions. In the invention corresponding to the fifth aspect, the degree of freedom in the direction in which the signal line is led out is increased.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a through current detector according to an embodiment of the present invention. FIG. 1 is a perspective view showing a first embodiment of a flow-through type current detector according to the present invention, FIG. 2 is a view showing a state in which an upper cover described later shown in FIG. 1 is opened, and FIG. It is an exploded perspective view.

In FIGS. 1, 2 and 3, this through-type current detector comprises a printed circuit board 6 shown in FIG. 3 inside a resin case 1A molded simultaneously with an upper cover 12 described later. The lower core holder 2A is placed on the upper part of the case 1A.

The upper core holder 3A is housed inside the upper cover 12, the upper core 4 is inserted into the upper core holder 3A, and the lower core holder 5A is inserted into the lower core holder 2A.
A and 5B are inserted. The details will be described below in order.

Among them, the case 1A is formed in a substantially U-shape with an open upper end, and is shown in FIG. A shallow groove 1a is formed. At the left and right upper portions of the case 1A, arc-shaped receiving portions 9 into which guide pieces described later on both sides of the lower core holder 2A are inserted are symmetrically projected.

A pair of guide portions 9a project from both sides on the inner surface side of the receiving portion 9, and a convex portion 9c is formed between the guide portions 9a with which the outer surfaces of the lower cores 5A and 5B come into contact. ing. A hook 9b, which is rectangular in a plan view (not shown), protrudes from the outer surface of the right receiving portion 9.

At the front end of the case 1A, a gutter-shaped support portion 11A for supporting the base end of the signal line 8 is provided so as to protrude forward.
A plurality of protrusions 11a are protruded at an intermediate portion on the inner periphery of 11A. A pair of thin hinge portions 1d are formed at the upper end on the outer surface side of the left receiving portion 9 between the base end of the upper cover 12 on the left and front sides.

At the upper end of the case 1A, a pair of grooves 1b is formed before and after the left and right receiving portions 9, and a claw portion 1c having a semicircular upper end surface is formed between these grooves 1b. I have.
The upper cover 12 is semicircular and has a gutter shape formed by ribs 12a formed on the front and rear sides on the inner peripheral side. A claw 12b protrudes from the center of the inner periphery of the rib 12a. A slight protrusion 12c is formed at the center of the inner periphery of the upper cover 12. rib
A V-shaped groove 12 is formed on the inner peripheral side of the
d is formed symmetrically as shown in FIG.

A knob 13 is formed on the outer periphery on the tip side of the upper cover 12 following a thin hinge portion 12e shown in FIG. 2, and a rectangular window 13a shown in FIG. At the tip end of the window 13a, a projection 13b having a semicircular cross section protruding inward in the assembled state of FIG.

The printed board 6 is inserted into the above-mentioned groove 1a formed on the inner surface of the case 1A, and a U-shaped notch is formed at the upper end of the printed board 6 as shown in FIG. Leads on both sides of a rectangular plate-shaped Hall element 7 attached to the right side of the cutout are soldered to the patterns formed on both sides of the groove.

A plurality of electronic components are mounted on the printed circuit board 6, and the other side of the pattern to which the leads of the above-described Hall elements 7 are soldered is provided with a plurality of through holes 6 a at the lower portion of the printed circuit board 6. It is connected to the.

The base end of the element wire 8a on the base end side of the signal line 8 is inserted into these through holes 6a and soldered. The signal line 8 has a base end placed on a support 11A mounted on the front end of the case 1A.

At the front end of the lower core holder 2A, a case 1
A holding portion 15A having the same shape as the supporting portion 11 protruding from the front end of A is provided in the opposite direction, and a plurality of protrusions are also provided on the inner periphery of the holding portion 15A.
The outer periphery of the signal line 8 is held between the inner periphery of the holding portion 15A and the inner periphery of the support portion 11A as shown in FIG. 1, and is pressed from above and below by upper and lower convex portions 15a and 11a.

On the rear upper surface of the lower core holder 2A, a gutter-like groove 2a on which the lower surface of the power line 17 is placed is formed in the front-rear direction. An insertion introduction portion 14A having a flat upper end surface is formed between the groove portion 2a and the holding portion 15A described above.
As shown in FIG. 1, an arrow-shaped mark 18 indicating the direction of a current flowing through a power line inserted between a groove 2a of the lower core holder 2A and a groove 3a of an upper core holder 3, which will be described later, is formed on the upper surface of the insertion introduction portion 14A. Is pasted.

At the left and right ends of the insertion introduction portion 14A, fitting projections 14a are formed, which are obliquely chamfered on the lower side and have concave portions formed on the upper side. Similar fitting projections are also provided on the left and right ends behind the groove 2a. 14
a is formed.

When the lower core holder 2A is inserted into the upper portion of the case 1A together with the lower cores 5A and 5B, the fitting projections 14a are formed inside the claw portions 1c formed on the upper and lower sides of the case 1A. Insert and fit.

On the left and right sides of the lower core holder 2A, arc-shaped guide claws 16A and 16B are provided to protrude on the outer peripheral side, and the distance between the lower ends is narrower than the upper end when viewed from a side (not shown). Of these guide claws 16A and 16B, only the upper portion is connected to the lower core holder 2A, and a claw portion slightly projecting rearward is formed at the lower end of the front guide claw 16A.

Between the left and right guide claws 16A and 16B, lower arc-shaped cores 5A and 5B are inserted from above. At the lower part of these lower cores 5A and 5B, a recess 5a is formed on the front side, and the claw at the lower end of the guide claw 16A is
a, and the lower cores 5A, 5B are provided with guide claws 16A, 16B.
Is bonded to the inner surface with an adhesive.

The outer shape of the upper core holder 3A is formed in an arc shape, a groove 3a is formed in a center portion, and ribs 3c are formed in front and rear on an outer periphery. 4 is formed with a groove 3d into which the groove 4 is inserted.

A groove 3b is formed vertically on both sides of the center of the groove 3a, and claws 3e are protruded from outer peripheral sides on both sides of the groove 3b. A triangular convex portion 3f is formed further outside the claws 3e.

An upper core 4 formed in a half-moon shape is inserted into a groove 3d formed on the outer periphery of the upper core holder 3A. The tips of the claws 3e of the upper core holder 3A are fitted by elastic deformation from the outside. The upper core 4 is held by the upper core holder 3A by a claw 3e having a tip fitted into the recess 4a.

The assembling of this through-type current detector starts with the groove 1 formed on the inner periphery of the case 1A shown in FIGS.
The printed circuit board 6 is inserted with the Hall element 7 facing upward with respect to a, and the jacket at the base end of the signal line 8 is placed on the support 11A.

Next, the lower part of the lower core holder 2A into which the lower cores 5A and 5B are inserted is inserted into the upper part of the case 1A, and the outer peripheral surfaces of the lower cores 5A and 5B inserted into the lower core holder 2A are received at the upper left and right ends of the case 1A. It is inserted into the inner surface of the protrusion 9c formed on the inner surface of the portion 9, and the fitting protrusions 14a formed on the front and rear sides of the lower core holder 2A are inserted inside the claw portions 1c on the front and rear ends of the upper end of the case 1A.

Next, the upper core holder 3A into which the upper core 4 has been inserted is inserted into the upper cover 12, and is fixed with the claws 12b formed on the upper cover 12, and then the knob 13 at the tip of the upper cover 12 is provided.
Is lifted as shown by the arrow B in FIG. 2 and turned clockwise, and this knob is pressed against the right side surface of the case 1A.
The hook 9b on the right side of the case 1A is fitted into the window 13a formed on the knob 13 as shown in FIG. When the power line is inserted, as shown by the arrow A in FIG.
After opening 13 outward and removing the knob 13 from the hook 9b,
Flip counterclockwise.

In the feedthrough current detector having the above-described structure, the upper cover 12 is fixed to the case 1A via the knob 13 so that the base end of the signal line 8 can be covered with the upper and lower holding portions.
Protrusions 15a, 11a formed on the inner periphery of 15A and support 11A
Therefore, the fixing force of the signal line 8 can be increased, and the supporting force of the measuring device connected to the distal end of the signal line 8 via the signal line 8 can be increased.

The upper core 4 and the lower cores 5A, 5B
Are inserted through the grooves of the upper and lower core holders that support them through the inner circumference of these cores, so that even if they are hung on bare power lines, the insulation properties between these power lines and the core can be maintained for a long time. Can be maintained over time.

Further, since the upper and lower cores are inserted into grooves formed in each core holder and are held on both sides by claws, even when the upper cover 12 is opened as shown in FIG. The possibility of falling can be eliminated. Also, since the upper cover 12 can be attached and detached with a single touch by operating the knob 13, the work of attaching to the power line is easy,
Can be attached and detached in a short working time.

FIG. 4 shows a second embodiment of the feedthrough type current detector of the present invention.
FIG. 5 is a diagram showing an embodiment of the present invention, which corresponds to FIG. 2 shown in the first embodiment and corresponds to claim 4. In FIG.
The difference from the first embodiment is the holding structure for the power line formed in the power line penetrating portion.

That is, in the penetration type current detector shown in FIGS. 1 to 3, the power line penetrating between the groove portion 3a of the upper core holder 3A and the groove portion 2a of the lower core holder 2A has an applicable rating of this penetration type current detector. When applied to a power line having the smallest rated current capacity among the above, the position in the longitudinal direction of the electric wire cannot be fixed.

Therefore, in this embodiment, the grooves 2a, 3a
A plurality of thin holding portions 22A, 22B
In the case of a thin power line, the holding portion 22
The power lines are clamped by bending the ends of A and 22B.

FIG. 5 shows a third embodiment of the through current detector according to the present invention.
FIG. 6 is a partial cross-sectional view showing the third embodiment, corresponding to the plan view (not shown) of FIG. 2 shown in the first embodiment and FIG. 4 shown in the second embodiment, and corresponding to claim 5. .

FIG. 5 is different from FIGS. 2 and 4 shown in the above-described embodiment in that the holding direction of the signal line can be changed by the structure of the signal line holding portion.

In FIG. 5, a supporting portion 11B protrudes from the front end of the case 1C, and a pressing portion 15B protrudes from the front end of the lower core holder 2B. These supports
A spherical electric wire support ball 24 is inserted from the inside into the inner surface side of 11B and the holding portion 15B, and the signal line 8 is inserted through the electric wire support ball 24 in advance.

A presser 23 for supporting the inside of a support ball 24 provided with a presser 23a with a spherical surface is inserted into the inner surfaces of the support 11B and the presser 15B, and the core holder 2B and the case 1 are bonded with an adhesive.
C.

In the through-type current detector having the signal line holding portion as described above, the direction of the signal line 8 with respect to the direction of the power line can be changed. Can be relaxed.

[0052]

As described above, according to the first aspect of the present invention, the groove for inserting the outer periphery of the printed circuit board on which the Hall element is mounted is formed on the inner periphery, and the receiving portions are formed on both sides on the opening side. The case where the support part which supports one side of the signal line connected to the one side protruded was provided on the outer surface of the receiving part on the other side via a hinge, the groove was formed inside and the knob was extended at the tip A pair of cores is formed by a cover and a pair of guide claws, which are provided at the opening side of the case and presser portions for pressing one side of the signal lines are formed to protrude therefrom, and grooves are formed on the inside thereof so as to face the lower surface of the electric wire to be measured, and are provided at the outer periphery. And an upper core holder having an arcuate core mounted on the outer periphery inserted into the groove of the cover via the claw portion and having a groove formed on the inner periphery to face the upper surface of the electric wire to be measured. , The wire to be measured and the upper and lower cores Since the insulating secured by the upper Koahoruda and lower Koahoruda, eliminating the risk of falling off of the core, it can be obtained through type current detector capable of increasing the insulation between the power line.

Further, according to the invention corresponding to claim 2, a plurality of convex portions pressed by the outer cover of the signal line are formed on the inner periphery of the supporting portion of the case and the pressing portion of the lower core holder, and the lower core holder is formed. By projecting a claw that engages with the groove of the core at the tip of the guide claw, one side of the signal line was fixed by the projection formed on the support of the case and the holding part of the lower core holder. It is possible to obtain a through-type current detector capable of eliminating the possibility of falling off and improving the insulation with the power line.

According to the third aspect of the present invention, a hook is protruded from the outer surface of the receiving portion on one side of the case, and a fitting hole for fitting the hook is formed in a knob of the cover. Since the cover can be fixed to the case with a single touch, the risk of the core falling off can be eliminated, the insulation with the power line can be increased, and a through-type current detector that can be easily attached and detached can be obtained.

According to the invention corresponding to claim 4, in particular, a plurality of holding portions are protrudingly provided on the inner periphery of both ends of the groove portion of the lower core holder and the groove portion of the upper core holder, so that the holding portions on both upper and lower sides are provided. In addition, since the case is prevented from moving when applied to a thin electric wire to be measured, it is possible to obtain a through-type current detector that eliminates the possibility of the core falling off and improves the insulation with the power line.

Further, according to the invention corresponding to claim 5, by providing a sphere support portion through which the signal wire passes between the support portion of the case and the pressing portion of the lower core holder, the signal wire at the outlet portion is provided. Since the degree of freedom in the outlet direction is increased, the risk of the core falling off can be eliminated, and a through-type current detector capable of increasing the insulation with the power line can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a through current detector according to the present invention.

FIG. 2 is a diagram showing a state in which a cover of the first embodiment of the through current detector according to the present invention is opened.

FIG. 3 is an exploded perspective view of the first embodiment of the through current detector of the present invention.

FIG. 4 is a diagram showing a second embodiment of a through current detector according to the present invention.

5A and 5B are diagrams showing a third embodiment of a through current detector according to the present invention, wherein FIG. 5B is a partial perspective view, FIG. 5C is a longitudinal sectional view of FIG. 5B, and FIG. FIG.

FIG. 6 is a perspective view showing an example of a conventional through-type current detector with a cover opened.

[Explanation of symbols]

1A, 1B, 1C: case, 1a: groove, 2A, 2B: lower core holder, 2a: groove, 3A: upper core holder, 3
a: groove, 3c: rib, 4: upper core, 5A, 5B: lower core, 6: printed circuit board, 7: hall element, 8: signal line, 9: receiving part, 9a: guide part, 9b: hook, 9c …
Protrusion, 11A, 11B: Support, 12: Upper cover, 12a: Rib, 12b: Claw, 12c: Convex, 12d: Groove, 13: Knob, 13
a ... window, 13b ... convex part, 14A ... insertion introduction part, 14a ... convex part,
15A, 15B: Holder, 16A, 16B: Guide claw, 17: Power line, 18: Mark, 22A, 22B: Holder, 23: Holder.

Claims (5)

[Claims] 1. A supporting portion for supporting one side of a signal line connected to the printed circuit board, wherein a groove into which the outer periphery of the printed circuit board on which the Hall element is mounted is inserted is formed on the inner periphery, and receiving portions are formed on both sides on the opening side. A case protruding on one side, a cover provided on the outer surface of the receiving portion on the other side via a hinge, a groove formed inside and a knob extended at the tip, and a cover inserted into the opening side of the case. A lower core holder for supporting a pair of cores with a pair of guide claws projecting from a holding portion for pressing one side of the signal line and having a groove formed on the inside facing the lower surface of the electric wire to be measured and projecting on the outer periphery; A through-type current detector comprising: an upper core holder having an arc-shaped core mounted on an outer periphery inserted into the groove via a claw portion and a groove formed on an inner periphery to face the upper surface of the electric wire to be measured. 2. A plurality of projections, which are pressed against the sheath of the signal line, are formed on the inner periphery of the supporting portion of the case and the holding portion of the lower core holder, and the core is provided at the tip of a guide claw of the lower core holder. 2. The through-type current detector according to claim 1, wherein a claw portion engaging with said groove is protruded. 3. The case according to claim 1, wherein a hook is projected from an outer surface of the receiving portion on one side of the case, and a fitting hole for fitting the hook is formed in a knob of the cover. 4. The through current detector according to 1. 4. The through-type according to claim 1, wherein a plurality of holding portions are protrudingly provided on inner circumferences of both ends of the groove of the lower core holder and the groove of the upper core holder. Current detector. 5. The through-type current detector according to claim 1, wherein a sphere supporting portion through which the signal line passes is provided between the supporting portion of the case and the pressing portion of the lower core holder.