CN102623268A - Circuit breaker with selective protection - Google Patents
Circuit breaker with selective protection Download PDFInfo
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- CN102623268A CN102623268A CN2011100281389A CN201110028138A CN102623268A CN 102623268 A CN102623268 A CN 102623268A CN 2011100281389 A CN2011100281389 A CN 2011100281389A CN 201110028138 A CN201110028138 A CN 201110028138A CN 102623268 A CN102623268 A CN 102623268A
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- conductive path
- current
- breakpoint
- circuit breaker
- electrically conductive
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Abstract
The invention relates to a circuit breaker with selective protection. The circuit breaker has a main electrically conductive path and a current-limiting electrically conductive path between a set of incoming line terminals and a set of outgoing line terminals, wherein the current-limiting electrically conductive path is connected in parallel with the main electrically conductive path. The main electrically conductive path comprises a breakpoint, a compression bar and a magnetic starter, the current-limiting electrically conductive path comprises a breakpoint, a bimetallic strip, a current-limiting resistor, and a shunt resistor, wherein the current-limiting electrically conductive path is connected in parallel with the main electrically conductive path between the incoming line terminals and the outgoing line terminals, the bimetallic element and the current-limiting resistor are connected in series in the current-limiting electrically conductive path, and two ends of the bimetallic element is connected in parallel with the shunt resistor. According to the invention, in the protection process of the selective protection circuit breaker, current flowing through the bimetallic strip when a short circuit exists can be reduced to protect the bimetallic strip from inferiority permanent deformation so as to prolong life endurance of the short circuit protection effectively.
Description
Technical field
The present invention relates to have the circuit breaker of selective protection, belong to the low-voltage electrical apparatus field.
Background technology
In application number is 201020265871.3 patent; A kind of circuit breaker with selective protection is proposed; This circuit breaker " the electromagnetic start coil of serial connection second breakpoint and driven magnetic release between second group of end of incoming cables and the leading-out terminal, the alternate path that parallel connection is connected and constituted by the 3rd breakpoint, thermal overload release and resistance between second group of end of incoming cables and electromagnetic start coil "; " when short circuit current occurring in the loop; electromagnetic start coil 5 acts on corresponding moving contact 202, the second corresponding breakpoint 2 is broken off, and other breakpoints 2 still remain on make position; so short circuit current is transformed on the parallel branch i.e. flow through thermal overload release 3 and resistance 4 of electric current.Through after the certain delay, thermal overload release 3 effect operating mechanisms 8 all break off each breakpoint 2; If short circuit current vanishes in the time-delay process is then closed again with corresponding second breakpoint of electromagnetic start coil, return to the normal power supply state." circuit breaker is under the short circuit current of 7 times of setting currents; the time of flowing through the bimetal leaf electric current is about 80 milliseconds; under 20 times of setting currents and bigger short circuit current, and the time of flowing through the bimetal leaf electric current is also near 20 milliseconds, yet carries out repeatedly finding after the short circuit test; in the case, the bimetallic sector-meeting produces permanent deformation and then causes the guard time scope to exceed calibration value.
Summary of the invention
The purpose of this invention is to provide a kind of circuit breaker with selective protection; When can reducing short circuit in the protection process, it flows through the electric current of bimetal leaf; The permanent deformation of pessimum can not take place in the protection bimetal leaf, and then effectively prolongs the life-span number of times of short-circuit protection.
The technical scheme that the present invention adopts is:
A kind of circuit breaker with selective protection; Comprise one group of end of incoming cables, one group of leading-out terminal; Between one group of end of incoming cables and one group of leading-out terminal, have leading electric pathway and the current limliting conductive path that becomes to be connected in parallel; Leading electric pathway comprises first breakpoint and magnetic actuator, and magnetic actuator is connected in the leading electric pathway and can breaks off first breakpoint through the effect depression bar, and the current limliting conductive path comprises second breakpoint, bimetal leaf, current-limiting resistance; Bimetal leaf can break off first breakpoint and second breakpoint through the effect operating mechanism, it is characterized in that:
Said bimetallic element, current-limiting resistance are connected in the current limliting conductive path, the two ends of bimetal leaf parallel connection shunt resistance.
Further:
Said shunt resistance and bimetal leaf are arranged side by side.
Said shunt resistance can adopt riveted joint mode or welding manner to connect with bimetallic element.
Said shunt resistance is by the electric conducting material manufacturing of high resistivity.
Said breakpoint comprises moving contact and fixed contact; The moving contact of leading electric pathway and current limliting conductive path is closed, is divided by operating mechanism control, and the moving contact of leading electric pathway can also be through magnetic actuator effect depression bar to change moving contact to the state that divides when the state that closes.
The present invention since at the two ends of bimetal leaf parallel connection shunt resistance, thereby can when short circuit, reduce to flow through the electric current of bimetal leaf, the permanent deformation of pessimum can not take place in the protection bimetal leaf, and then effectively prolongs the life-span number of times of short-circuit protection.
Description of drawings
Fig. 1 is the present invention program's a electrical schematic diagram;
Fig. 2 is the present invention program's a structural representation;
Fig. 3 is that the A-A of Fig. 2 is to cutaway view;
Fig. 4 is the present invention program's current-limiting resistance, shunt resistance, two golden modular construction sketch map.
Embodiment
Below in conjunction with accompanying drawing, specify technical scheme of the present invention.
A kind of circuit breaker with selective protection; Comprise one group of end of incoming cables 1, one group of leading-out terminal 2; Between one group of end of incoming cables 1 and one group of leading-out terminal 2, have the leading electric pathway 3 and current limliting conductive path 4 that become to be connected in parallel; Leading electric pathway 3 comprises first breakpoint 51 and magnetic actuator 7; Magnetic actuator 7 is connected in the leading electric pathway 3 and can breaks off first breakpoint 51 through effect depression bar 6, and current limliting conductive path 4 comprises second breakpoint 52, bimetal leaf 8, current-limiting resistance 9, and bimetal leaf 8 can break off first breakpoint 51 and second breakpoints 52 through effect operating mechanism 11.Wherein:
Said bimetallic element 8, current-limiting resistance 9 are connected in the current limliting conductive path 4, the two ends of bimetal leaf 8 parallel connection shunt resistance 10.
Breakpoint 5 comprises moving contact 501 and fixed contact 502; The moving contact 501 of leading electric pathway 3 and current limliting conductive path 4 is closed, is divided by operating mechanism 11 controls, and the moving contact 501 of leading electric pathway 3 can also be through magnetic actuator 7 effect depression bars 6 to change moving contact 501 to the state that divides when the state that closes.
This selective protective breaker course of work is following:
Electric current flow through end of incoming cables 1 and leading-out terminal 2; When short circuit current occurring in the loop; Magnetic actuator 7 acts on depression bar 6, and corresponding moving contact 501 is done with its center of rotation and is rotated counterclockwise, and the first corresponding breakpoint 51 is broken off; And second breakpoint 52 of current limliting conductive path 4 still remains on make position, so short circuit current is transformed on the current limliting conductive path 4.Because bimetal leaf 8 is connected in the current limliting conductive path 4; Therefore the electric current bimetal leaf 8 of also flowing through; In addition bimetal leaf 8 two ends parallel connections shunt resistance 10, play shunting action, by the inverse ratio shunting of its resistance value; The electric current that flows through bimetal leaf has so just reduced, and can guarantee that under limit short circuit breaking situation electric current through bimetal leaf 8 is lower than it and can bears electric current.Through after the certain delay, bimetal leaf 8 effect operating mechanisms 11 all break off each breakpoint; If short circuit current vanishes in the time-delay process is then closed again with magnetic actuator 7 corresponding breakpoints 51, return to the normal power supply state.
Claims (5)
1. circuit breaker with selective protection; Comprise one group of end of incoming cables, one group of leading-out terminal; Between one group of end of incoming cables and one group of leading-out terminal, have leading electric pathway and the current limliting conductive path that becomes to be connected in parallel, leading electric pathway comprises first breakpoint and magnetic actuator, and magnetic actuator is connected in the leading electric pathway and can breaks off first breakpoint through the effect depression bar; The current limliting conductive path comprises second breakpoint, bimetal leaf, current-limiting resistance; Bimetal leaf can break off first breakpoint and second breakpoint through the effect operating mechanism, and said bimetallic element, current-limiting resistance are connected in the current limliting conductive path, it is characterized in that:
The two ends parallel connection shunt resistance of said bimetal leaf.
2. the circuit breaker with selective protection according to claim 1 is characterized in that: said shunt resistance and bimetal leaf are arranged side by side.
3. the circuit breaker with selective protection according to claim 1 is characterized in that: said shunt resistance adopts riveted joint mode or welding manner to connect with bimetallic element.
4. the circuit breaker with selective protection according to claim 1 is characterized in that: said shunt resistance is by the electric conducting material manufacturing of high resistivity.
5. the circuit breaker with selective protection according to claim 1; It is characterized in that: said breakpoint comprises moving contact and fixed contact; The moving contact of leading electric pathway and current limliting conductive path is closed, is divided by operating mechanism control, and the moving contact of leading electric pathway can also be through magnetic actuator effect depression bar to change moving contact to the state that divides when the state that closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100281389A CN102623268A (en) | 2011-01-26 | 2011-01-26 | Circuit breaker with selective protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100281389A CN102623268A (en) | 2011-01-26 | 2011-01-26 | Circuit breaker with selective protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102623268A true CN102623268A (en) | 2012-08-01 |
Family
ID=46563117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100281389A Pending CN102623268A (en) | 2011-01-26 | 2011-01-26 | Circuit breaker with selective protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102623268A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0023277A1 (en) * | 1979-07-31 | 1981-02-04 | BROWN, BOVERI & CIE Aktiengesellschaft Mannheim | Selective protection device |
| US20100127816A1 (en) * | 2007-04-28 | 2010-05-27 | Abb Ag | Installation switchgear |
| CN201927560U (en) * | 2011-01-26 | 2011-08-10 | 北京人民电器厂有限公司 | Circuit breaker with selective protection function |
-
2011
- 2011-01-26 CN CN2011100281389A patent/CN102623268A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0023277A1 (en) * | 1979-07-31 | 1981-02-04 | BROWN, BOVERI & CIE Aktiengesellschaft Mannheim | Selective protection device |
| US20100127816A1 (en) * | 2007-04-28 | 2010-05-27 | Abb Ag | Installation switchgear |
| CN201927560U (en) * | 2011-01-26 | 2011-08-10 | 北京人民电器厂有限公司 | Circuit breaker with selective protection function |
Non-Patent Citations (1)
| Title |
|---|
| 连理枝: "过电流脱扣器用双金属元件的选择和设计", 《电气开关》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120801 |