CN103065782A - Zero sequence current mutual inductor - Google Patents
Zero sequence current mutual inductor Download PDFInfo
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- CN103065782A CN103065782A CN2011103254203A CN201110325420A CN103065782A CN 103065782 A CN103065782 A CN 103065782A CN 2011103254203 A CN2011103254203 A CN 2011103254203A CN 201110325420 A CN201110325420 A CN 201110325420A CN 103065782 A CN103065782 A CN 103065782A
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- mutual inductor
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- annular core
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Abstract
The invention relates to a zero sequence current mutual inductor which comprises an annular core, a secondary coil, axial shielding rings, a mutual inductor shell and a primary coil conducting loop. The secondary coil is wound on the annular core, the axial shielding rings which are the same in number are arranged on two axial sides of the annular core, the mutual inductor shell is annular and wraps the annular core, the secondary coil and the axial shielding rings tightly, the center of the mutual inductor shell is divided into four spaces in a cross-shaped mode, and the primary coil conducting loop penetrates through the divided spaces. The zero sequence current mutual inductor further comprises a first radial shielding ring and a second radial shielding ring which are respectively arranged on the radial inner side and the radial outer side of the annular core, and the first radial shielding ring, second radial shielding ring and the axial shielding rings wrap the annular core tightly. Compared with the prior art, the zero sequence current mutual inductor has the advantages that when large currents pass through the zero sequence current mutual inductor, malfunction currents can not be generated on the secondary coil due to asymmetrical structure and the like.
Description
Technical field
The present invention relates to a kind of parts of Aftercurrent protection circuit breaker, especially relate to a kind of zero sequence current mutual inductor.
Background technology
Corresponding to the good circuit of any insulation, flow in the circuit and the current phasor that flows out and should be always zero.If it is found that the vector of electric current in a certain circuit of flowing through and when non-vanishing, just can conclude in this circuit to have residual current.The reason that residual current produces is normally because insulation damages or earth fault, its possibility of result can endanger the people life security, cause fire or produce other danger.
For fear of the issuable danger of residual current; except the insulation that should guarantee circuit avoids damaging and avoids the generation of earth fault; the general device that energy of series connection works to residual current in circuit is as protection system; this class device uses with circuit breaker usually, forms Aftercurrent protection circuit breaker.Aftercurrent protection circuit breaker can provide the indirect contact protection to the people in the situation that causes voltage to earth to increase because of insulation damages, and provides supplementary protection to fire and other danger that may cause because of earth fault.
Aftercurrent protecting equipment in the Aftercurrent protection circuit breaker generally includes a zero sequence current mutual inductor, an electronic controller, a magnetictrip and a protecting sheathing that is made of several insulating elements.Wherein, zero sequence current mutual inductor is for detection of the residual current in detected its primary coil circuit of flowing through, electronic controller is collected the signal of telecommunication that generates from the induction of zero sequence current mutual inductor secondary coil, through judgement with relatively, produce actuating signal, the state that is used for the control magnetictrip, magnetictrip then are the action commands of response electronic controller, deciliter state of control circuit breaker.Protecting sheathing then is to insulate and isolate band electric parts in the Aftercurrent protecting equipment, and the above each parts is played one support and the effect of location.
Take four-pole circuit breaker as example, zero sequence current mutual inductor is used for measuring the simultaneously summation of current flowing of four circuit corresponding to detected circuit, therefore, zero sequence current mutual inductor central authorities pass four circuit of mutually being isolated with criss-cross general layout by transformer casing as the primary coil of zero sequence current mutual inductor.In theory, when circuit and load normal operation, the electric current of four circuit is at every vector and be zero in a flash in the zero sequence current mutual inductor of flowing through simultaneously, and at this moment, the induced field in the iron core of zero sequence current mutual inductor is zero, and secondary coil does not have electric current output.
Yet, because the geometry of four circuit when passing zero sequence current mutual inductor of primary coil is not full symmetric, therefore, the vector of the electric current of primary coil and be zero although flow through in the circuit, the inhomogeneous induced field that the primary coil galvanic circle produces can produce the output current that originally should not exist by the annular core of zero sequence current mutual inductor at secondary coil.The electric current of flowing through in elementary coil galvanic circle acquires a certain degree, and the output current of secondary coil will surpass the original action threshold value of setting of electronic controller, and at this moment, magnetictrip will drive circuit breaker tripping.Aftercurrent protection circuit breaker has just produced misoperation.
Be example with four-pole circuit breaker more than, in three utmost points or two polar circuits, also analogue can occur.
For the primary coil galvanic circle that reduces to pass annular core produces inhomogeneous induced field to the impact of secondary coil, existing technology is, in the annular core outside that is wound with secondary coil a similar magnetic conduction radome that centers on its sealing is fully arranged, both sides, the outside at this magnetic conduction radome, arranging vertically the axial shield ring of being made by magnetic conductive metal of some, attempt by magnetic conduction radome and the isolation of axial shield ring and balanced from axially and stray field radially to the interference of zero sequence current mutual inductor.
The shortcoming of prior art is, although axial stray field can satisfy insulation request by quantity or the thickness that increases the axial shield ring, stray field radially but only has the isolation of magnetic conduction radome, therefore, by larger electric current the time, still have stray field to pass the radially screen of magnetic conduction radome weakness, disturb the iron core of zero sequence current mutual inductor, make secondary coil produce wrong output current.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of defective that can eliminate existing system in order to overcome the defective that above-mentioned prior art exists, and particularly avoids the zero sequence current mutual inductor of the misoperation that Aftercurrent protection circuit breaker produces because of the interference of stray field by larger electric current the time.
Purpose of the present invention can be achieved through the following technical solutions: a kind of zero sequence current mutual inductor, comprise annular core 41, secondary coil 43, axial shield ring 44, transformer casing 45 and primary coil galvanic circle 42, described secondary coil 43 is on annular core 41, these annular core 41 axial both sides are equipped with the axial shield ring 44 of equal number, described transformer casing 45 in the form of a ring, and closely double team annular core 41, secondary coil 43 and axial shield ring 44, the central authorities of transformer casing 45 are separated into four spaces by cross, described primary coil galvanic circle 42 is located in the space that is separated into, it is characterized in that, described instrument transformer also comprises the first shading ring 472 and second shading ring 471 radially radially, first radially shading ring 472 and second radially shading ring 471 be located at respectively the radially inside and outside both sides of annular core 41, coaxial shading ring 44 is tight teamed annular core 41 together.
Described first radially shading ring 472 and second radially the roll of strip made by the metal magnetic conducting material of shading ring 471 turn to.
Described metal magnetic conducting material is silicon steel.
Roll of strip around thickness and the quantity of the axial shield ring 44 of annular core 41 axial both sides satisfy: when the volume that makes zero sequence current mutual inductor with minimum satisfies maximum current by regulation, be unlikely to make secondary coil export the misoperation electric current because inhomogeneous induced field produces in annular core.
42 two ends, described primary coil galvanic circle are connected with end of incoming cables binding post 421 and leading-out terminal binding post 422.
The quantity of described primary coil galvanic circle 42 is 2,3 or 4.
Compared with prior art, the present invention has the following advantages:
1, be in the radially shading ring of the radially inside and outside both sides of annular core and secondary coil and axially the axial shield ring of both sides blocked stray magnetic field around the annular core from all directions, by adjusting the radially thickness of shading ring and the quantity of axial shield ring, in the time of can making zero sequence current mutual inductor satisfy maximum current by regulation with the volume of minimum, be unlikely to make secondary coil export the misoperation electric current because inhomogeneous induced field produces in annular core.
2, adopt the magnetic field shielding structure that to adjust as required thickness, overcome that zero sequence current mutual inductor radially shields weak defective in the prior art, thereby guaranteed the reliability service of Aftercurrent protection circuit breaker.
3, can eliminate the defective of existing system; the misoperation of particularly avoiding Aftercurrent protection circuit breaker by larger electric current the time, to produce because of the interference of stray field; by optimizing the geometry of zero sequence current mutual inductor screen; form symmetrical structure; to pass through toroidal magnetic flux homogenized thereby make, and can not produce the signal that disturbs secondary coil.
Description of drawings
Fig. 1 is the external structure schematic diagram of zero sequence current mutual inductor;
Fig. 2 is the decomposition texture schematic diagram of zero sequence current mutual inductor of the present invention;
Fig. 3 is the cross-sectional view of zero sequence current mutual inductor of the present invention;
Fig. 4 is the Aftercurrent protecting equipment schematic diagram that is contained on the circuit-breaker;
Fig. 5 is Aftercurrent protecting equipment decomposition texture schematic diagram;
Fig. 6 is the decomposition texture schematic diagram of the zero sequence current mutual inductor of prior art;
Fig. 7 is the cross-sectional view of the zero sequence current mutual inductor of prior art.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
According to one preferred example of the present invention; a kind of zero sequence current mutual inductor for Aftercurrent protection circuit breaker is provided; in order to the residual current in the testing circuit; when the residual current in detecting circuit reaches the dropout threshold value; magnetictrip action in the Aftercurrent protecting equipment; promote circuit breaker tripping, finally make the circuit breaker open circuit.Fig. 4 has represented mechanical connection and the relative position of a four-pole circuit breaker 1 and Aftercurrent protecting equipment 2.
Referring to Fig. 5; Fig. 5 is the decomposing schematic representation of described Aftercurrent protecting equipment 2, and the Aftercurrent protecting equipment 2 in the described Aftercurrent protection circuit breaker generally includes a zero sequence current mutual inductor 4, an electronic controller 3, a magnetictrip 5 and a protecting sheathing 6 that is made of several insulating elements.Zero sequence current mutual inductor 4 is collected the current signal that generates from the induction of zero sequence current mutual inductor 4 secondary coils for detection of the residual current in its primary coil of flowing through, electronic controller 3; through judgement and after produce actuating signal; the state that is used for control magnetictrip 5; the action command of magnetictrip 5 response electronic controllers 3; deciliter state of control circuit breaker 1; protecting sheathing 6 then is the band electrical accessory of isolating in the above-mentioned parts, and to above-mentioned member supporting and location.
Referring to Fig. 6, Fig. 7, the zero sequence current mutual inductor 4 of existing technology is by annular core 41, primary coil galvanic circle 42, secondary coil 43, axial shield ring 44, magnetic conduction radome 46 and transformer casing 45 consist of, the outward appearance of annular core 41 ringwise, secondary coil 43 is along the cross section coiling of annular core 41, a similar magnetic conduction radome 46 that centers on its sealing is fully arranged in annular core 41 outsides that are wound with secondary coil 43, magnetic conduction radome 46 partly covers 461 and 462 by two metals that mutually fasten and consists of, and is arranging vertically the axial shield ring 44 of being made by magnetic conductive metal of some on the both sides, the outside of this magnetic conduction radome 46.Magnetic conduction radome 46 and axial shield ring 44 are used for isolation from stray field axial and radially, and primary coil galvanic circle 42 is passed from the centre of transformer casing 45.
Referring to Fig. 1, from the appearance, annular core and secondary coil are by transformer casing 45 parcels in the zero sequence current mutual inductor 4, and by transformer casing 45 supports and location, each of primary coil galvanic circle 42 is divided into the up and down mutual isolation of four lattice from transformer casing 45 centres respectively mutually and the space of insulation is passed, and 42 two ends, primary coil galvanic circle are respectively with end of incoming cables binding post 421 and leading-out terminal binding post 422.
Fig. 2, Fig. 3 is zero sequence current mutual inductor 4 of the present invention, it is (Fig. 6 on prior art, shown in Figure 7) on the improvement done, by annular core 41, primary coil galvanic circle 42, secondary coil 43, axial shield ring 44, the second shading ring 471 radially, first radially shading ring 472 and transformer casing 45 consist of, the outward appearance of annular core 41 ringwise, roll of strip by high permeability material turns to, secondary coil 43 is along the cross section coiling of loop coil 41, the radially inside and outside both sides of annular core 41 are respectively equipped with the first shading ring 472 and second shading ring 471 radially radially, the second shading ring 471 radially, first radially shading ring 472 equate with the annular core width, both sides, the outside at the annular core 41 that is wound with secondary coil 43, arranging vertically the axial shield ring 44 of being made by the metal magnetic conducting material of some, the external diameter of axial shield ring 44 covers larger second outside of shading ring 471 radially, its internal diameter then covers less first inboard of shading ring 472 radially, radially the roll of strip of shading ring around thickness and the quantity that is located at the axial shield ring 44 of annular core 41 axial both sides satisfy: when the volume that makes zero sequence current mutual inductor with minimum satisfies maximum current by regulation, be unlikely to make secondary coil export the misoperation electric current because inhomogeneous induced field produces in annular core.Transformer casing 45 be wrapped in annular core 41, secondary coil 43, second radially shading ring 471, first radially shading ring 472 and axial shield ring 44 around so that above-mentioned parts becomes as a whole.Another effect of transformer casing 45 be as on the zero sequence current mutual inductor 4 once and the electrical isolation between the secondary circuit, the central authorities of transformer casing 45 are divided into four lattice, primary coil galvanic circle 42 is therefrom passed, its each utmost point mutually insulated.When circuit breaker 1 is three utmost points or the two poles of the earth, then use three or two in four spaces of transformer casing 45 central authorities.The two ends of primary coil galvanic circle 42 are respectively with end of incoming cables binding post 421 and leading-out terminal binding post 422, and described radially shading ring 471,472 roll of strip by the metal magnetic conducting material turn to.According to a specific embodiment of the present invention, second radially shading ring 471, first radially the roll of strip made by the metal magnetic conducting material of shading ring 472 turn to.The metal magnetic conducting material is silicon steel.
Above-described device is a preferred embodiment, and take four utmost point Aftercurrent protection circuit breakers as example, other two utmost point, three utmost point Aftercurrent protection circuit breakers are also included among the technical program.
Claims (6)
1. zero sequence current mutual inductor, comprise annular core (41), secondary coil (43), axial shield ring (44), transformer casing (45) and primary coil galvanic circle (42), described secondary coil (43) is on annular core (41), the axial both sides of this annular core (41) are equipped with the axial shield ring (44) of equal number, described transformer casing (45) in the form of a ring, and closely double team annular core (41), secondary coil (43) and axial shield ring (44), the central authorities of transformer casing (45) are separated into four spaces by cross, described primary coil galvanic circle (42) is located in the space that is separated into, it is characterized in that, described instrument transformer also comprises the first shading ring (472) and second shading ring (471) radially radially, first radially shading ring (472) and second radially shading ring (471) be located at respectively the radially inside and outside both sides of annular core (41), coaxial shading ring (44) is tight teamed annular core (41) together.
2. a kind of zero sequence current mutual inductor according to claim 1 is characterized in that, described first radially shading ring (472) and second radially the roll of strip made by the metal magnetic conducting material of shading ring (471) turn to.
3. a kind of zero sequence current mutual inductor according to claim 2 is characterized in that, described metal magnetic conducting material is silicon steel.
4. a kind of zero sequence current mutual inductor according to claim 2, it is characterized in that, roll of strip around thickness and annular core (41) axially the quantity of the axial shield ring (44) of both sides satisfy: when the volume that makes zero sequence current mutual inductor with minimum satisfies maximum current by regulation, be unlikely to make secondary coil export the misoperation electric current because inhomogeneous induced field produces in annular core.
5. a kind of zero sequence current mutual inductor according to claim 1 is characterized in that, two ends, described primary coil galvanic circle (42) are connected with end of incoming cables binding post (421) and leading-out terminal binding post (422).
6. a kind of zero sequence current mutual inductor according to claim 1 or 5 is characterized in that the quantity of described primary coil galvanic circle (42) is 2,3 or 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110325420.3A CN103065782B (en) | 2011-10-24 | 2011-10-24 | A kind of zero sequence current mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110325420.3A CN103065782B (en) | 2011-10-24 | 2011-10-24 | A kind of zero sequence current mutual inductor |
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| CN103065782A true CN103065782A (en) | 2013-04-24 |
| CN103065782B CN103065782B (en) | 2016-05-18 |
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| CN201110325420.3A Active CN103065782B (en) | 2011-10-24 | 2011-10-24 | A kind of zero sequence current mutual inductor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996510A (en) * | 2014-05-09 | 2014-08-20 | 安庆天瑞新材料科技股份有限公司 | Novel zero sequence current mutual inductor capable of increasing overload limit non-operating currents |
| CN105355400A (en) * | 2015-12-10 | 2016-02-24 | 西南交通大学 | Structure for inhibiting flux leakage and improving transmission efficiency of alternating current magnetic field |
| CN111381084A (en) * | 2020-01-16 | 2020-07-07 | 华中科技大学 | Stray parameter becomes more meticulous adjustable high frequency current sensor |
| CN112447385A (en) * | 2020-12-03 | 2021-03-05 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | High-power electric leakage mutual inductor for copper bar measurement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4295112A (en) * | 1978-08-30 | 1981-10-13 | Mitsubishi Denki Kabushiki Kaisha | Residual current transformer |
| CN1118105A (en) * | 1994-08-30 | 1996-03-06 | 富士电机株式会社 | Zero-sequence current common reactancer |
| CN2413353Y (en) * | 2000-03-15 | 2001-01-03 | 常熟开关厂 | Zero-sequence current transformer |
| CN201601013U (en) * | 2009-11-26 | 2010-10-06 | 平高集团有限公司 | Voltage transformer and shielding case thereof |
-
2011
- 2011-10-24 CN CN201110325420.3A patent/CN103065782B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4295112A (en) * | 1978-08-30 | 1981-10-13 | Mitsubishi Denki Kabushiki Kaisha | Residual current transformer |
| CN1118105A (en) * | 1994-08-30 | 1996-03-06 | 富士电机株式会社 | Zero-sequence current common reactancer |
| CN2413353Y (en) * | 2000-03-15 | 2001-01-03 | 常熟开关厂 | Zero-sequence current transformer |
| CN201601013U (en) * | 2009-11-26 | 2010-10-06 | 平高集团有限公司 | Voltage transformer and shielding case thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996510A (en) * | 2014-05-09 | 2014-08-20 | 安庆天瑞新材料科技股份有限公司 | Novel zero sequence current mutual inductor capable of increasing overload limit non-operating currents |
| CN105355400A (en) * | 2015-12-10 | 2016-02-24 | 西南交通大学 | Structure for inhibiting flux leakage and improving transmission efficiency of alternating current magnetic field |
| CN111381084A (en) * | 2020-01-16 | 2020-07-07 | 华中科技大学 | Stray parameter becomes more meticulous adjustable high frequency current sensor |
| CN111381084B (en) * | 2020-01-16 | 2021-06-29 | 华中科技大学 | Stray parameter becomes more meticulous adjustable high frequency current sensor |
| CN112447385A (en) * | 2020-12-03 | 2021-03-05 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | High-power electric leakage mutual inductor for copper bar measurement |
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| Publication number | Publication date |
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| CN103065782B (en) | 2016-05-18 |
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