CN102427004A - Tripping device for circuit breaker - Google Patents

Tripping device for circuit breaker Download PDF

Info

Publication number
CN102427004A
CN102427004A CN2011103829677A CN201110382967A CN102427004A CN 102427004 A CN102427004 A CN 102427004A CN 2011103829677 A CN2011103829677 A CN 2011103829677A CN 201110382967 A CN201110382967 A CN 201110382967A CN 102427004 A CN102427004 A CN 102427004A
Authority
CN
China
Prior art keywords
iron core
core
armature
circuit
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011103829677A
Other languages
Chinese (zh)
Other versions
CN102427004B (en
Inventor
张洵初
陈志刚
王炯华
管瑞良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changshu Switchgear Manufacturing Co Ltd
Original Assignee
Changshu Switchgear Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changshu Switchgear Manufacturing Co Ltd filed Critical Changshu Switchgear Manufacturing Co Ltd
Priority to CN201110382967.7A priority Critical patent/CN102427004B/en
Publication of CN102427004A publication Critical patent/CN102427004A/en
Application granted granted Critical
Publication of CN102427004B publication Critical patent/CN102427004B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/12—Magnetic shunt paths

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Breakers (AREA)

Abstract

The invention discloses a tripping device for a circuit breaker. The tripping device comprises a U-shaped iron core and an armature, wherein the armature is arranged at the opening end of the U-shaped iron core; a working air gap is formed between the armature and the opening end of the U-shaped iron core; the U-shaped iron core and the armature form a first magnetic circuit; a main current loop of the circuit breaker passes through the first magnetic circuit to provide excitation; and a signal measuring coil is wound on the U-shaped iron core. Further, a branch iron core is connected with the part, close to the opening end, of the U-shaped iron core; the branch iron core and a part of the U-shaped iron core form a closed magnetic circuit; moreover, in the closed magnetic circuit, the branch iron core achieves magnetic saturation earlier than the U-shaped iron core; and when short-circuit current appears in the main current loop, the magnetic force between the armature and the U-shaped iron core drives the armature to move relative to the U-shaped iron core. Compared with the prior art, the tripping device can effectively monitor fault current such as overload current, short-circuit current and the like, and has a compact structure.

Description

A kind of circuit breaker is used release
Technical field
The present invention relates to a kind of release, relate in particular to a kind of release that is used for circuit breaker.
Background technology
Typical breaker of plastic casing generally is to realize the heat protection and the short-circuit protection of circuit breaker through bimetallic element and magnetictrip are set.Special, the operating characteristics when protecting in order to satisfy heat, bimetal leaf or heater can produce a large amount of power losss with the form of heat.
In order to overcome the problems referred to above of circuit breaker, the electronic type molded case circuit breaker that current transformer is installed is born thereupon, and this type of circuit breaker greatly reduces the temperature rise of circuit breaker; But aspect short-circuit protection; Owing to need judge short circuit current through all kinds of electronic components, so the opening time of circuit breaker is often longer, especially when the big short circuit current of disjunction; Be disadvantageous this long opening time; So the magnetictrip that reserve is installed in past contact meeting in electronic type molded case circuit breaker shortens the break-time when big short circuit current occurring, but this has brought new problem again: because reserve magnetictrip summation current transformer branch is arranged, it is bigger to take volume; Structure is not compact, is unfavorable for the miniaturization development of circuit breaker.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency of prior art, and a kind of release of integrated signal measurement coil of compact conformation is provided, and can effectively monitor fault currents such as overload and short circuits.。
The present invention solves above-mentioned technical problem through following technical scheme:
A kind of circuit breaker is used release; Comprise U sections core; And be located at the armature of U sections core openend, and have working gas gap between armature and the U sections core openend, U sections core and armature constitute first magnetic circuit; The main current loop of circuit breaker is passed first magnetic circuit so that excitation to be provided, and on said U sections core, is wound with the signal measurement coil.
Further, said U sections core is connected with a branch road iron core near its open end, and the part of this branch road iron core and U sections core constitutes a closed magnetic circuit, and in said closed magnetic circuit, this branch road iron core reaches magnetic saturation prior to U sections core; When short circuit current occurring in the main current loop, the relative U sections of the magnetic drive armature core between armature and the U sections core produces motion.。
When above-mentioned release is worked, pass to the main circuit current of being monitored in the main current loop, in iron core, produce magnetic field; Electric current hour in major loop; Branch road iron core unsaturation; The signal measurement coil can correctly reflect the current conditions in the main current loop through electromagnetic coupled, and exports signal the control assembly of the circuit breaker that is electrically connected with the signal measurement coil to, is judged whether major loop is broken off by it; When occurring big electric current in the major loop; Magnetic flux in the iron core sharply increases; The branch road iron core reaches magnetic saturation earlier, and the magnetic flux of generation is passed by the magnetic loop with air gap that U sections core and armature are constituted, and produces big magnetic potential between armature and the U sections core; Produce relative motion between armature and the U sections core this moment, and break off main circuit current.
Preferably, said branch road iron core magnetic saturation when said main circuit current reaches the rated current of circuit breaker.
Iron core reaches magnetic saturation, is meant that the magnetic flux density in the iron core reaches its saturation flux density.Under the certain situation of total magnetic flux, make the branch road iron core reach magnetic saturation earlier, the magnetic circuit sectional area that can be through adjusting each several part in the said closed magnetic circuit and the saturation flux density of each several part institute materials used realize, for example, can adopt following scheme respectively:
First kind of scheme: said branch road iron core and said U sections core are manufactured from the same material, and the magnetic circuit sectional area of branch road iron core is less than the magnetic circuit sectional area of U sections core.
Second kind of scheme: said branch road iron core is identical with the magnetic circuit sectional area of said U sections core, and the saturation flux density of the employed material of branch road iron core is less than the saturation flux density of U sections core institute materials used.
More than two schemes be merely and give an example; Also can adopt other method; For example, when the saturation flux density of the employed material of branch road iron core during much smaller than the saturation flux density of U sections core institute materials used, the magnetic circuit sectional area of branch road iron core also can be greater than the magnetic circuit sectional area of U sections core; Perhaps when the magnetic circuit sectional area of branch road iron core during much smaller than the magnetic circuit sectional area of U sections core, the saturation flux density of the employed material of branch road iron core also can be greater than the saturation flux density of U sections core institute materials used.Those skilled in the art can obtain various scheme through rational magnetic Circuit Design.
Preferably, said branch road iron core is that soft magnetic material is processed.
Further, said soft magnetic material is a soft magnetic ferrite.
Compare prior art; Release of the present invention can effectively be monitored fault currents such as overload and short circuits; Realized the integrated design of magnetictrip and current transformer; Compact conformation, parts reduce and because the magnetictrip action makes the magnetic circuit characteristic change, thereby make signal measurement coil ability perception magnetictrip move the short circuit current fault-signal be provided.
Description of drawings
Fig. 1 is the structural representation of the present invention's one specific embodiment, and wherein scheming A is three-dimensional view, and figure B is a front view;
Fig. 2 is the principle schematic that is used for the release of circuit breaker of the present invention;
Fig. 3 is the equivalent magnetic circuit figure that is used for the release of circuit breaker of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
As a specific embodiment that is used for the release of circuit breaker of the present invention; Its structure is as shown in Figure 1; Comprise: be used for the iron core excitation main current loop 3, be used to provide signal measurement coil 1 and a U sections core, a branch road iron core 7 and an armature 6 of signals such as overload; Armature 6 is arranged at the openend of U sections core, and has working gas gap between the openend of armature 6 and U sections core.Armature 6 forms first magnetic circuit with U sections core, and in this specific embodiment, U sections core is constituted with two identical iron cores 2 by iron core 4.Branch road iron core 7 is connected between two iron cores 2; Thereby constitute a closed magnetic circuit with the part of iron core 4, iron core 2; The magnetic circuit sectional area of branch road iron core 7 inserts the circuit breaker major loop of being monitored less than magnetic circuit sectional area main current loop 3 two ends of iron core 4 and iron core 2; If main circuit current is bigger enough electromagnetic excitations can be provided, then main current loop can directly be passed first magnetic circuit, also passes closed magnetic circuit certainly; If main circuit current is smaller, then main current loop becomes many circles to be wound on the iron core 4.The signal measurement coil 1 that is connected with the control assembly (not shown) of circuit breaker is wound on the iron core 2.As shown in the figure, when the magnetic force between armature 6 and the U sections core during, produce relative motion between armature 6 and the U sections core and drive the disconnecting apparatus (not shown) and break off main circuit current greater than this spring counter-force.In order to reduce that magnetic circuit is influenced, support 5 is preferably processed by the non-magnetic material.Preferential embodiment is provided on the fixed support for armature 6 rotationally, fixed support and U sections core relative fixed, and spring 8 is provided between armature 6 and the support and to armature 6 counter-force is provided.
Main circuit current in main current loop 3 hour; Overload current for example; The magnetic flux path that main current loop 3 is produced is the closed magnetic circuit that a part constituted by branch road iron core 7, iron core 4, iron core 2; At this moment; Signal measurement coil 1 can reflect correctly that the electric current in the main current loop 3 changes, and signal measurement coil 1 transfers to the control assembly (for example intelligent controller) of circuit breaker with signal, is judged whether major loop is broken off by the size and the duration of control assembly according to main circuit current.
When short circuit current occurring in the major loop, the magnetic flux in the magnetic circuit sharply increases, in the closed magnetic circuit that a part constituted of branch road iron core 7, iron core 4, iron core 2; Because the magnetic circuit sectional area of branch road iron core 7 is less than the magnetic circuit sectional area of iron core 4 and iron core 2; Branch road iron core 7 takes the lead in reaching capacity, and at this moment, magnetic flux mainly passes through from iron core 4, iron core 2, armature 6 and first magnetic circuit that air gap constituted; Exist between armature 6 and the iron core 2 and bigger magnetic potential occurs; Electromagnetic attraction exceeds the spring counter-force, and is as shown in Figure 1, and armature 6 is rapidly around its pivot center 62 rotations; An end face 21 of final armature face 63 and iron core 2 against, the disconnecting apparatus that armature 6 will drive in the circuit breaker in this rotary course makes the major loop disconnection.
For making the clearer technical scheme of the present invention of the public, further analyze in the face of principle of the present invention down:
Principle of the present invention is as shown in Figure 2; Its equivalent magnetic circuit (not counting leakage field) is as shown in Figure 3; The branch road that wherein has two parallel connections, the closed magnetic circuit that a part constituted for branch road iron core 7, iron core 4, iron core 2, another is first magnetic circuit that armature 6, air gap, iron core 4 and iron core 2 constitute; The branch road of total magnetic flux through these two parallel connections, the magnetic resistance ratio of each branch road have determined the magnetic flux that passed through in each branch road.
If the tested electric current in the main current loop 3 is I 1Tested electric current in secondary coil 1 winding is I 2 Primary coil 3 umber of turns are N 1 Signal measurement coil 1 umber of turn is N 2Air gap amount between armature 6 and the iron core 2 is δ; R M1Magnetic resistance for armature 6; R M2Magnetic resistance for iron core 2; R M3Magnetic resistance for iron core 4; R M4Magnetic resistance for branch road iron core 7; R δBe the air-gap reluctance between armature 6 and the iron core 2; Φ is a main flux; Φ 2Be air-gap flux; Φ 1Be magnetic flux in the branch road iron core 7; I 1N 1Magnetic potential for main current loop 3 generations; I 2N 2Magnetic potential for 1 generation of signal measurement coil.Can know according to the magnetic circuit principle:
Main flux Φ does
Figure 2011103829677100002DEST_PATH_IMAGE002
，
Air-gap flux Φ 2For
Figure DEST_PATH_IMAGE004
?
Figure DEST_PATH_IMAGE006
，
Work as I 1Hour, since the existence of two sections air gaps, its magnetic resistance R δMagnetic resistance R much larger than branch road iron core 7 M4, main flux Φ is mainly passed through by the closed magnetic circuit that a part constituted of branch road iron core 7, iron core 4, iron core 2; Work as I 1When sharply increasing, branch road iron core 7 reaches capacity, at this moment its magnetic resistance R M4Sharply increase far ultra air-gap reluctance R δ, main flux Φ will be mainly passes through air-gap flux Φ by iron core 4, armature 6 and loop that air gap constituted 2Also increase thereupon, work as Φ 2Big after to a certain degree, armature 6 will overcome the adhesive of spring counter-force, rapidly around its pivot center 62 rotations, the end face 21 of final armature face 63 and iron core 2 against.The disconnecting apparatus that armature 6 will drive in the circuit breaker in this rotary course breaks off major loop.In the rotary course of armature 6 because the air gap of 21 of armature face 63 and magnetic conductive board end faces constantly reduces air-gap reluctance R δConstantly reduce, the magnetic field intensity in the iron core 2 constantly strengthens, and the variation of this magnetic field intensity will be by 1 correct the feeding back of signal measurement coil; The signal that this moment, signal measurement coil 1 produced is compared with the signal when the overload current; Have the amplitude height, the characteristics that the signal curve rate of climb is fast, this signal inputs to control assembly; The size that control assembly comes the failure judgement electric current according to parameters such as signal amplitudes also can be judged the release action when control assembly detects this type of signal simultaneously.
Release of the present invention can effectively be monitored fault currents such as overload and short circuits, when overload fault, provides signal to the circuit breaker control assembly by the signal measurement coil, by the action of control assembly control circuit breaker.Armature can be fast directly promotes the release mechanism action in the circuit breaker when short trouble, and the control assembly of circuit breaker can also detect the action of armature, thereby accurately judges the state of circuit breaker.In addition, the shared same iron core because data side amount coil and magnetic are threaded off has been realized magnetic release and has measured the integrated of coil that reduced parts, compact conformation, volume have obtained effective control.

Claims (8)

1. a circuit breaker is used release; Comprise U sections core; And be located at the armature of U sections core openend, and have working gas gap between armature and the U sections core openend, U sections core and armature constitute first magnetic circuit; The main current loop of circuit breaker is passed first magnetic circuit so that excitation to be provided, and it is characterized in that: on said U sections core, be wound with the signal measurement coil.
2. circuit breaker is used release according to claim 1; It is characterized in that said U sections core is connected with a branch road iron core near its open end, the part of this branch road iron core and U sections core constitutes a closed magnetic circuit; And in said closed magnetic circuit, this branch road iron core reaches magnetic saturation prior to U sections core; When short circuit current occurring in the main current loop, the relative U sections of the magnetic drive armature core between armature and the U sections core produces motion.
3. use release like the said circuit breaker of claim 2, it is characterized in that, the magnetic saturation when said main circuit current reaches the rated current of circuit breaker of said branch road iron core.
4. use release like the said circuit breaker of claim 2, it is characterized in that, said branch road iron core and said U sections core are manufactured from the same material, and the magnetic circuit sectional area of branch road iron core is less than the magnetic circuit sectional area of U sections core.
5. use release like the said circuit breaker of claim 2, it is characterized in that, said branch road iron core is identical with the magnetic circuit sectional area of said U sections core, and the saturation flux density of the employed material of branch road iron core is less than the saturation flux density of U sections core institute materials used.
6. use release like the said circuit breaker of claim 5, it is characterized in that, said branch road iron core is that soft magnetic material is processed.
7. like the said circuit breaker Current Transformer of claim 6, it is characterized in that said soft magnetic material is a soft magnetic ferrite.
8. use release like each said circuit breaker of claim 1-7, it is characterized in that, said armature is arranged on the support processed by non-magnet material rotationally.
CN201110382967.7A 2011-11-28 2011-11-28 Tripping device for circuit breaker Active CN102427004B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110382967.7A CN102427004B (en) 2011-11-28 2011-11-28 Tripping device for circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110382967.7A CN102427004B (en) 2011-11-28 2011-11-28 Tripping device for circuit breaker

Publications (2)

Publication Number Publication Date
CN102427004A true CN102427004A (en) 2012-04-25
CN102427004B CN102427004B (en) 2014-12-24

Family

ID=45960970

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110382967.7A Active CN102427004B (en) 2011-11-28 2011-11-28 Tripping device for circuit breaker

Country Status (1)

Country Link
CN (1) CN102427004B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09204868A (en) * 1996-01-29 1997-08-05 Matsushita Electric Works Ltd Breaker trip device
CN201185167Y (en) * 2008-02-19 2009-01-21 常熟开关制造有限公司(原常熟开关厂） Magnetic flux converter
CN201975250U (en) * 2011-01-13 2011-09-14 上海诺雅克电气有限公司 Power supply current transformer for electronic protection
CN201985056U (en) * 2011-04-22 2011-09-21 北京利达英杰联合技术有限公司 Electrical apparatus release used in arc fault protection device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09204868A (en) * 1996-01-29 1997-08-05 Matsushita Electric Works Ltd Breaker trip device
CN201185167Y (en) * 2008-02-19 2009-01-21 常熟开关制造有限公司(原常熟开关厂） Magnetic flux converter
CN201975250U (en) * 2011-01-13 2011-09-14 上海诺雅克电气有限公司 Power supply current transformer for electronic protection
CN201985056U (en) * 2011-04-22 2011-09-21 北京利达英杰联合技术有限公司 Electrical apparatus release used in arc fault protection device

Also Published As

Publication number Publication date
CN102427004B (en) 2014-12-24

Similar Documents

Publication Publication Date Title
US11047921B2 (en) Protective wiring device
US5933306A (en) Circuit breaker with ground fault detection module
JPH0334038Y2 (en)
US7002440B2 (en) Compact low cost current sensor and current transformer core for circuit breakers having improved dynamic range
US8228655B2 (en) Fault current limiter
CN101965620A (en) Residual-current circuit breaker
CN103795022A (en) Fault current detecting circuit
CN102419419B (en) The method of the function of the magnetictrip of detector switch, particularly low-voltage circuit breaker
KR0163421B1 (en) Trip device for an electrical switch and an electrical switch with device
EP2568494A2 (en) Leakage current detector and circuit interrupter
WO2012094903A1 (en) Supply current transformer for electronic protection
AU2009100563A4 (en) An electromagnetic current limiter device
RU2390865C2 (en) Current transformer for electric power supply and manufacturing method thereof
RU2638299C2 (en) Device for protection of windings of one-phase transformer from damages
EP2671243A1 (en) Electromagnetic relay, in particular for interruption of an electric circuit in the cases of differential circuit, and a switch comprising such relay
CN2599734Y (en) Automatic cut-off for arc fault
CN105280450B (en) Circuit-breaker
CN102427004A (en) Tripping device for circuit breaker
KR101989604B1 (en) Circuit breaker with instantaneous trip of pcb type
US9595413B2 (en) Low instantaneous level circuit breakers, circuit breaker tripping mechanisms, and tripping methods
JP3498055B2 (en) Device that performs power transformer function and instantaneous trip function
EP2509092B1 (en) Electric switching device
CN204117816U (en) A kind of coil block with temperature sensor
CN212182248U (en) Intelligent sensing device for electric leakage type of electric power internet of things molded case circuit breaker
CN102651293B (en) Circuit breaker

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant