CN215266007U - Current sensing device and circuit breaker - Google Patents

Abstract

The utility model provides a current induction system and circuit breaker, current induction system is through being in the same place first mutual-inductor and second mutual-inductor are integrated to overlap at second through wires hole and first through wires hole forms first threading space, forms second threading space at the part that the second through wires hole is located the second mutual-inductor outside, just can pass first mutual-inductor and second mutual-inductor simultaneously from the first threading passageway on the casing, can only pass the second mutual-inductor from the second threading passageway, has compact structure, small and characteristics with low costs. The N pole unit of the circuit breaker is provided with the current sensing device, the current transformer and the zero sequence transformer do not need to be arranged on the N pole unit and the L pole unit respectively, and the current transformer and the zero sequence transformer do not need to be installed separately, so that the size of the circuit breaker can be reduced, and the circuit breaker is more convenient to install and wire.

Description

Current sensing device and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a current induction device and have this current induction device's circuit breaker.

Background

Low-voltage circuit breakers, also known as automatic air switches or automatic air circuit breakers, can be used not only for distributing electric energy and protecting circuits, but also for infrequent switching of the circuits and for infrequent starting of the motors. The circuit breaker is generally provided with two transformers, namely a current transformer and a zero sequence current transformer, wherein the current transformer is arranged in an L pole unit or an N pole unit of the circuit breaker and is used for sampling current, a main loop of the L pole unit and a main loop of the N pole unit respectively penetrate through the zero sequence current transformer, and leakage current is sampled through the zero sequence current transformer. However, the two transformers need to be separately and independently arranged, occupy a large space, and further cause the size of the circuit breaker to be larger, which is not beneficial to the miniaturization of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a current induction system of current transformer and zero sequence current transformer integral type.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a current sensing device, its includes the casing and installs first mutual-inductor and second mutual-inductor in the casing respectively, is equipped with first through wires hole and second through wires hole on first mutual-inductor and second mutual-inductor respectively, and the second through wires hole is greater than first through wires hole, and first mutual-inductor sets up in one side of second mutual-inductor, and the second through wires hole forms first threading space with the overlap section of first through wires hole, forms second threading space in the part that the second through wires hole is located the second mutual-inductor outside, be equipped with first threading passageway and the second threading passageway that corresponds respectively with first threading space and second threading space on the casing.

Preferably, the first transformer is a current transformer, and the second transformer is a zero sequence current transformer.

Preferably, the second transformer comprises first induction parts which are arranged oppositely, and two second induction parts which are connected between the first induction parts respectively, the first induction parts are in a semicircular shape respectively, and the second threading holes are formed between the two second induction parts and the first induction parts in a surrounding mode.

Preferably, the first mutual inductor is in a circular ring shape, the circle center of one first induction part is overlapped with that of the first mutual inductor, and the other first induction part is positioned on the outer side of the first mutual inductor.

Preferably, the first transformer and the second transformer are respectively filled with an insulating material with the housing.

Preferably, the casing includes housing and upper cover, be equipped with the sleeve in the housing and with the baffle that the sleeve interval set up, enclose by the sleeve and form first threading passageway, first mutual-inductor and second mutual-inductor can overlap respectively in the telescopic outside, the baffle passes the second mutual-inductor, and spacing with the outside of first mutual-inductor.

Preferably, the upper cover is provided with a pressing plate protruding towards the interior of the housing, and the pressing plate can press the second mutual inductor in the housing.

Preferably, the clamp plate includes the first portion that compresses tightly that sets up with the baffle interval to and the second portion that compresses tightly that is connected with first portion both ends that compress tightly respectively, and two second portions compress tightly that the one end that the portion kept away from first portion that compresses tightly extends to the both ends of baffle respectively, enclose at first portion, baffle and two second portions that compress tightly and be the second threading passageway.

The utility model discloses a current sensing device is through being in the same place first mutual-inductor and second mutual-inductor are integrated to overlap at second through wires hole and first through wires hole forms first threading space, forms second threading space in the part that the second through wires hole is located the second mutual-inductor outside, first threading passageway on the follow casing just can pass first mutual-inductor and second mutual-inductor simultaneously, can only pass the second mutual-inductor from second threading passageway, has compact structure, small and characteristics with low costs.

The utility model also provides a circuit breaker, it includes current induction system.

The utility model also provides a circuit breaker, it includes L utmost point unit, N utmost point unit and control pole, be equipped with the current induction device of any of in the N utmost point unit, the main return circuit of L utmost point unit passes current induction device's first threading passageway, and the main return circuit of N utmost point unit passes current induction device's second threading passageway.

Preferably, the N-pole unit further includes an N-pole lead, an L-pole lead, an N-pole outgoing terminal, a stationary contact, and an electrical leakage release, the current sensing device is disposed between the N-pole outgoing terminal and the stationary contact, the electrical leakage release is disposed above the current sensing device, the N-pole lead is disposed on one side of the current sensing device and connected to the stationary contact, the L-pole lead is disposed between the other side of the current sensing device and the N-pole outgoing terminal, and the L-pole lead is connected to the L-pole outgoing terminal of the L-pole unit.

The utility model discloses a circuit breaker, through setting up at the N utmost point unit current induction system, need not set up current transformer and zero sequence transformer respectively at N utmost point unit and L utmost point unit, also need not install current transformer and zero sequence transformer respectively alone, not only can reduce the volume of circuit breaker, it is also more convenient to install and lay wire moreover.

Drawings

Fig. 1 is a schematic structural diagram of the current sensing device of the present invention;

fig. 2 is an exploded view of the current sensing apparatus of the present invention;

FIG. 3 is a schematic structural view of the housing of the present invention;

fig. 4 is a schematic structural diagram of the circuit breaker of the present invention;

fig. 5 is a schematic structural diagram of the N-pole unit of the present invention;

fig. 6 is a schematic structural diagram of an L-pole unit of the present invention;

fig. 7 is another embodiment of the N-pole cell of the present invention.

Detailed Description

The following describes the current sensing device according to the present invention with reference to the embodiments shown in fig. 1 to 7. The current sensing device of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-3, the utility model discloses a current sensing device includes casing 10 and installs first mutual-inductor 11 and second mutual-inductor 12 in casing 10 respectively, is equipped with first through wires hole 110 and second through wires hole 120 on first mutual-inductor 11 and second mutual-inductor 12 respectively, and second through wires hole 120 is greater than first through wires hole 110, and first mutual-inductor 11 sets up in one side of second mutual-inductor 12, and second through wires hole 120 forms first threading space with the overlap portion of first through wires hole 110, forms second threading space in the part that second through wires hole 120 is located the second mutual-inductor 12 outside, be equipped with first threading passageway 101 and second threading passageway 102 that correspond respectively with first threading space and second threading space on casing 10.

The utility model discloses a current induction device, through being in the same place first mutual-inductor 11 and second mutual-inductor 12 are integrated to overlap at second through wires hole 120 and first through wires hole 110 forms first threading space, the part that is located the second mutual-inductor 12 outside at second through wires hole 120 forms second threading space, first threading passageway 101 on the follow casing 10 just can pass first mutual-inductor 11 and second mutual-inductor 12 simultaneously, can only pass second mutual-inductor 12 from second threading passageway 102, compact structure has, small and characteristics with low costs.

Further, the first transformer 11 is a current transformer, the second transformer 12 is a zero sequence current transformer, the current transformer is configured to collect a current signal in the first threading channel 101, the zero sequence current transformer is configured to collect an electric leakage signal in the first threading channel 101 and the second threading channel 102, the current transformer and the zero sequence current transformer respectively include an iron core (not shown in the figure) and a winding (not shown in the figure) wound on the iron core, and signals sensed by the current transformer and the zero sequence current transformer are output through the winding, for example, when the collected electric leakage current satisfies a certain value, the circuit breaker is driven to trip. It can be understood that first mutual inductor 11 also can be zero sequence current transformer, and second mutual inductor 12 is current transformer simultaneously, or, two mutual inductors also can be current transformer or be zero sequence current transformer, all belong to the utility model discloses a protection scope.

As shown in fig. 2, the first transformer 11 is in a circular ring shape, the second transformer 12 is in a oval shape, the second transformer 12 includes first sensing portions 121 arranged oppositely, and two second sensing portions 122 connected between the first sensing portions respectively, the first sensing portions 121 are in a semicircular ring shape respectively, the two second sensing portions 122 are in a straight plate shape respectively, the second threading holes 120 are enclosed between the two second sensing portions 122 and the first sensing portions 121, one of the first sensing portions coincides with the center of the first transformer 11 and forms the first threading space, and the other first sensing portion is located outside the first transformer 11 and forms the second threading space.

One end of the second transformer 12 in the length direction of the present embodiment is used to form a first threading space in cooperation with the first transformer 11, and the other end in the length direction thereof is used to form a second threading space. It is understood that the first transformer 11 and the second transformer 12 may also take other shapes, such as a square frame structure, or other polygonal structures, and are not limited herein.

As shown in fig. 1 to 3, the housing 10 includes an enclosure 103 and an upper cover 104, and the first transformer 11 and the second transformer 12 may be filled and fixed by an insulating material such as epoxy resin after being installed in the enclosure 103, that is, the insulating material is filled between the first transformer 11 and the housing 10 and between the second transformer 12 and the housing 10. Of course, the filling with epoxy resin may not be performed, a limiting structure is provided between the housing 103 and the upper cover 104, and the first transformer 11 and the second transformer 12 may also be fixed by the limiting structure.

Specifically, the housing 103 is provided with a first housing through hole 1033 and a second housing through hole 1034 corresponding to the first threading passage 101 and the second threading passage 102, the upper cover 104 is provided with a first upper cover through hole 1041 and a second upper cover through hole 1042 corresponding to the first threading passage 101 and the second threading passage 102, the shape of the side wall of the housing 103 matches the outline of the outer side of the second transformer 12, when the second transformer 12 is installed in the housing 103, the periphery of the second transformer 12 can be limited by the side wall of the housing 103, the side wall of the housing 103 comprises two first side walls arranged oppositely and two second side walls 1032 connected between the first side walls 1031, the first side wall 1031 is in a semicircular shape and the same as the first sensing part, the second side wall 1032 is in a straight plate shape and the same as the second sensing part 122, the first transformer 11 and the second transformer 12 are installed in the housing 103 respectively, and the upper cover 104 is arranged on the housing 103, so that the structure is compact and the volume is small, and no additional part is needed for fixing. It is understood that the shapes of the housing 103 and the upper cover 104 may be adjusted according to the first transformer 11 and the second transformer 12, and may also be different, all of which belong to the protection scope of the present invention.

Further, the limiting structure comprises a sleeve 105 arranged in the housing 103, the first threading channel 101 is surrounded by the sleeve 105, and the first mutual inductor 11 and the second mutual inductor 12 can be respectively sleeved outside the sleeve 105.

Further, limit structure still includes the baffle 106 that sets up with sleeve 105 interval in the housing 103, and second mutual-inductor 12 can overlap the outside of sleeve 105 and baffle 106 spacing with the lateral wall of housing 103 to make baffle 106 can pass second mutual-inductor 12, and spacing with first mutual-inductor 11's the outside, sleeve 105 and baffle 106 interval set up, first mutual-inductor 11 can overlap in the outside of sleeve 105, and one side and the baffle 106 of first mutual-inductor 11 are spacing, and the opposite side is spacing with the first lateral wall 1031 of housing 103.

Further, the limiting structure further comprises a pressing plate 107 arranged on the upper cover 104 in a protruding mode, the pressing plate 107 is correspondingly arranged on the outer side of the first mutual inductor 11, and the pressing plate 107 can be inserted into the housing 103 to press the second mutual inductor 12 in the housing 103. It can be understood that the limiting structures may be fixed on the housing 103, or may be fixed on the upper cover 104, which all fall within the protection scope of the present invention.

Further, the clamp plate 107 includes the first portion 1071 that compresses tightly that sets up with baffle 106 interval to and the second portion 1072 that compresses tightly that is connected with first portion 1071 both ends respectively, and two second portions 1072 keep away from the one end of first portion 1071 and extend to the both ends of baffle 106 respectively, enclose at first portion 1071, baffle 106 and two second portions 1072 and be the second threading passageway 102, can improve casing 10's protectiveness, and effectively reduce the interference. Preferably, the baffle 106 is in an arc shape, and is matched with an arc surface of an outer ring of the first transformer 11.

The utility model also provides a circuit breaker, include the utility model discloses a current induction system.

Preferably, as shown in fig. 4-6, the utility model also provides a circuit breaker, including L utmost point unit 2, N utmost point unit 3 and control pole 4, be equipped with in the N utmost point unit 3 current induction system, control pole 4 can set up in one side of L utmost point unit 2 or one side of N utmost point unit 3, and control pole 4 is equipped with circuit board (not shown in the figure) and test button 41, and current induction system will detect current signal and or the circuit board that electric leakage signal conveyed control pole 4, and the circuit board is judged to have overload and or electric leakage trouble, then triggers the circuit breaker dropout.

The utility model discloses a circuit breaker, through setting up at N utmost point unit 3 current induction system, need not set up current transformer and zero sequence transformer respectively at N utmost point unit 3 and L utmost point unit 4, also need not install current transformer and zero sequence transformer respectively alone, not only can reduce the volume of circuit breaker, it is also more convenient to install and lay wire moreover.

As shown in fig. 6, the L pole unit 2 includes an L pole base 21, and an adjusting screw 23, an arc extinguish chamber 24, an L pole outgoing terminal 25, an L pole operating mechanism 27, an L pole handle, an overload protection mechanism and a short circuit protection mechanism, which are respectively disposed in the base 21, wherein the L pole outgoing terminal 25 is connected to an L pole main loop, the overload protection mechanism includes a bimetal element 22, the bimetal element 22 can be bent by heating and can trip the circuit breaker when overloaded, the adjusting screw 23 can push the bimetal element 22 to adjust the position, thereby adjusting the overload protection action time, although the current sensing device can also detect whether the circuit breaker is overloaded and the control pole 4 trips the circuit breaker, the bimetal element 22 can be used as a backup protection for the overload, thereby preventing the current transformer from inaccurate collection or failure; the short circuit protection mechanism includes a short circuit coil that is capable of tripping the circuit breaker upon a short circuit.

It can be understood that, the overload protection mechanism and the short-circuit protection mechanism may be provided at the same time at the L pole unit 2, or only one of them may be provided, or none of them may be provided, that is, the L pole unit 2 includes the overload protection mechanism and/or the short-circuit protection mechanism, all belong to the protection scope of the present invention.

As shown in fig. 5, the N-pole unit 3 includes an N-pole base 30, and a current sensing device, an N-pole operating mechanism 32, an N-pole lead 33, an L-pole lead 35, an N-pole outgoing terminal 36, a static contact 38, an electrical leakage release 37, and an N-pole handle 31 respectively disposed in the N-pole base 30, wherein the L-pole lead 35 and the N-pole lead 33 pass through a first threading channel 101 and a second threading channel 102 of the current sensing device, the current sensing device is disposed between the N-pole outgoing terminal 36 and the static contact 38, the electrical leakage release 37 is disposed above the current sensing device, the N-pole lead 33 is disposed at the right side of the current sensing device and connected to the static contact 38, the L-pole lead 35 is disposed between the left side of the current sensing device and the N-pole outgoing terminal 36, the L-pole lead 35 is connected to the L-pole outgoing terminal 25 of the L-pole unit 2, the L-pole outgoing terminal 25 of the embodiment passes through the N-pole base 30, the L-pole lead 35 may be connected to the L-pole outlet terminal 25 through the N-pole base 30.

As shown in fig. 7, according to another embodiment, in the circuit breaker of this embodiment, two independent L-pole current transformers 28 and L-pole leakage transformers 29 are disposed in the N-pole unit 3, the current sensing device is replaced by the two separate L-pole current transformers 28 and L-pole leakage transformers 29, the main loop of the L-pole unit 4 sequentially passes through the L-pole current transformers 28 and the L-pole leakage transformers 29, and the main loop of the N-pole unit 3 passes through the L-pole leakage transformers 29. The circuit breaker of this embodiment all sets up two mutually independent L utmost point current transformer 28 and L utmost point earth leakage mutual-inductor 29 in N utmost point unit 3, also can avoid setting up current transformer and zero sequence transformer respectively the problem in N utmost point unit 3 and L utmost point unit 4, nevertheless for the utility model discloses a current induction device's preferred embodiment, its space that occupies is great. Preferably, the L-pole leakage transformer 29 is located below the leakage release 37, the L-pole current transformer 28 is located between the L-pole leakage transformer 29 and the N-pole outlet terminal 36, and axes of the L-pole current transformer 28 and the L-pole leakage transformer 29 are perpendicular to each other.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (11)

1. A current sensing device, characterized by: including casing (10) and install first mutual-inductor (11) and second mutual-inductor (12) in casing (10) respectively, be equipped with first through wires hole (110) and second through wires hole (120) on first mutual-inductor (11) and second mutual-inductor (12) respectively, and second through wires hole (120) are greater than first through wires hole (110), first mutual-inductor (11) set up the one side at second mutual-inductor (12), second through wires hole (120) form first threading space with the overlap portion of first through wires hole (110), the part that is located the second mutual-inductor (12) outside at second through wires hole (120) forms second threading space, be equipped with first threading passageway (101) and second threading passageway (102) that correspond respectively with first threading space and second threading space on casing (10).

2. The current sensing device of claim 1, wherein: the first mutual inductor (11) is a current mutual inductor, and the second mutual inductor (12) is a zero sequence current mutual inductor.

3. The current sensing device of claim 1, wherein: the second mutual inductor (12) comprises first induction parts (121) which are arranged oppositely and two second induction parts (122) which are connected between the first induction parts respectively, the first induction parts (121) are in semicircular shapes respectively, and the second threading holes (120) are formed between the two second induction parts (122) and the first induction parts (121) in a surrounding mode.

4. The current sensing device of claim 3, wherein: the first mutual inductor (11) is in a circular ring shape, the circle center of one first induction part coincides with the circle center of the first mutual inductor (11), and the other first induction part is located on the outer side of the first mutual inductor (11).

5. The current sensing device of claim 1, wherein: and insulating materials are respectively filled between the first mutual inductor (11) and the shell (10) and between the second mutual inductor (12) and the shell (10).

6. The current sensing device of claim 1, wherein: casing (10) include housing (103) and upper cover (104), be equipped with in housing (103) sleeve (105) and with baffle (106) that sleeve (105) interval set up, enclose by sleeve (105) and become formation first threading passageway (101), first mutual-inductor (11) and second mutual-inductor (12) can overlap respectively in the outside of sleeve (105), and baffle (106) pass second mutual-inductor (12), and spacing with the outside of first mutual-inductor (11).

7. The current sensing device of claim 6, wherein: the upper cover (104) is provided with a pressing plate (107) protruding into the housing (103), and the pressing plate (107) can press the second transformer (12) in the housing (103).

8. The current sensing device of claim 7, wherein: the clamp plate (107) includes the first portion (1071) that compresses tightly that sets up with baffle (106) interval to and compress tightly portion (1072) with the second that first portion (1071) both ends are connected respectively, two second compress tightly the one end that portion (1071) was kept away from to first portion (1072) and extend to the both ends of baffle (106) respectively, compress tightly portion (1071), baffle (106) and two seconds and compress tightly portion (1072) and enclose and be second threading passageway (102).

9. A circuit breaker, characterized by: comprising a current sensing device according to any one of claims 1-8.

10. A circuit breaker, characterized by: comprising an L pole unit (2), an N pole unit (3) and a control pole (4), wherein the N pole unit (3) is internally provided with a current sensing device as claimed in any one of claims 1 to 8, a main loop of the L pole unit (2) passes through a first threading channel (101) of the current sensing device, and a main loop of the N pole unit (3) passes through a second threading channel (102) of the current sensing device.

11. The circuit breaker of claim 10, wherein: the N pole unit (3) further comprises an N pole lead (33), an L pole lead (35), an N pole outgoing terminal (36), a static contact (38) and an electric leakage release (37), the current induction device is arranged between the N pole outgoing terminal (36) and the static contact (38), the electric leakage release (37) is located above the current induction device, the N pole lead (33) is located on one side of the current induction device and connected with the static contact (38), the L pole lead (35) is located between the other side of the current induction device and the N pole outgoing terminal (36), and the L pole lead (35) is connected with the L pole outgoing terminal (25) of the L pole unit (2).

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