CN108962646A - The low overvoltage low-voltage circuit breaker of current-limiting type - Google Patents
The low overvoltage low-voltage circuit breaker of current-limiting type Download PDFInfo
- Publication number
- CN108962646A CN108962646A CN201810607684.XA CN201810607684A CN108962646A CN 108962646 A CN108962646 A CN 108962646A CN 201810607684 A CN201810607684 A CN 201810607684A CN 108962646 A CN108962646 A CN 108962646A
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- China
- Prior art keywords
- low
- arc
- conductive rod
- moving
- overvoltage
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
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- Circuit Breakers (AREA)
Abstract
The present invention relates to a kind of low overvoltage low-voltage circuit breakers of current-limiting type, including moving contact, static contact, static conductive rod, moving conductive rod, insulated connecting rod and operating mechanism, operating mechanism connects moving conductive rod by insulated connecting rod, the moving contact face static contact connected under moving conductive rod, further include power spring, is connected between static contact and static conductive rod with power spring.Due to the structure of power spring; so that separating brake has the characteristics that arc length is ever-increasing; not only it can use elongating arc and improved arc voltage to reach current limitation effect and before electric arc blow-out and electric arc can be made to shorten do not make electric arc generation overvoltage to lower arc voltage and damage the insulation of other protected devices.Also avoiding other dual operation mechanisms, structure is complicated, stroke with the time only will increase without reducing the problem of.It is a kind of blast circuit breaker that not only there is current limitation effect but also do not generate overvoltage.
Description
Technical field
The present invention relates to a kind of electrical equipment, in particular to the low overvoltage low-voltage circuit breaker of a kind of current-limiting type.
Background technique
Low-voltage circuit breaker can always generate electric arc between two sseparated contacts when opening.Only equal arc extinctions two
Electrical and mechanical separation is just really realized between contact.But extinguishes electric arc and need to take certain methods.At present in low tension
Common arc quenching method is had elongating arc or cools down electric arc simultaneously or be divided into electric arc using the cathode effect of electric arc in device
Short arc etc., the purpose of these methods are that the voltage of raising electric arc makes electric arc that can not exist to extinguish, but works as arc voltage
The current limitation effect of electric arc is too strong when too high, this is easy to generate overvoltage in systems to damage the insulation of protected device.
Summary of the invention
The present invention be directed to the arc-suppressing methods of present low-voltage circuit breaker to be easy to produce high voltage, thus it requires being switched off device
The equipment or protected equipment cut-off must have the problem of higher dielectric level, and it is low excessively electric to propose a kind of current-limiting type
Voltage breaker is forced down, elongating arc has not only been can use and has improved arc voltage to reach current limitation effect and before electric arc blow-out but also energy
Shorten electric arc to lower arc voltage, does not make electric arc that overvoltage occur and damage the insulation of other protected devices.
The technical solution of the present invention is as follows: a kind of low overvoltage low-voltage circuit breaker of current-limiting type, including it is moving contact, static contact, quiet
Conducting rod, moving conductive rod, insulated connecting rod and operating mechanism, operating mechanism connect moving conductive rod by insulated connecting rod, under moving conductive rod
The moving contact face static contact of connection, further includes power spring, is connected between static contact and static conductive rod with power spring.
When the low-voltage circuit breaker closes a floodgate, moving contact is closed on static contact and compression conductive spring.
The beneficial effects of the present invention are: the low overvoltage low-voltage circuit breaker of current-limiting type of the present invention, breaker is due to having electricity
The ever-increasing feature of arc length, therefore can not only possess good current limitation effect, but also overvoltage is not high.Also avoid it
Structure is complicated for its dual operation mechanisms, stroke with the time only will increase without reducing the problem of.It is a kind of both with current limliting
Effect does not generate the blast circuit breaker of overvoltage again.
Detailed description of the invention
Fig. 1 is the low overvoltage low-voltage circuit breaker structural schematic diagram of current-limiting type of the present invention；
Fig. 2 is the low overvoltage low-voltage circuit breaker stroke curve figure of current-limiting type of the present invention；
Fig. 3 is the low overvoltage low-voltage circuit breaker interrupting process figure of current-limiting type of the present invention.
Specific embodiment
The low overvoltage low-voltage circuit breaker structural schematic diagram of current-limiting type as shown in Figure 1, by moving contact, static contact, power spring,
The operating mechanism that static conductive rod, moving conductive rod, insulated connecting rod and pervious low-voltage circuit breaker natively have collectively constitutes.Operation machine
Structure connects moving conductive rod by insulated connecting rod, the moving contact face static contact connected under moving conductive rod, static contact and static conductive rod it
Between connected with power spring, the principle of this arc-chutes is as follows；When operating mechanism obtains the sub-gate signal of relay protection either
Operating mechanism starts to act after the signal of buckle releaser, drives insulated connecting rod movement, and insulated connecting rod drives moving conductive rod and moving contact
It is acted to far from static contact direction, when closing a floodgate, compressed power spring is at this time as the movement of moving contact also starts to discharge
The energy generated by compression, although moving contact is moved to disengaging static contact direction, simultaneously under the action of power spring
Static contact is followed and is contacted with moving contact to same direction always and moves, when power spring is stretched over extreme position,
Power spring starts to move in the opposite direction, and at this moment dynamic and static contact really separates.Moving contact moves to open position, stationary contact
Head is quickly moved the distance between moving contact and is increased quickly by power spring with to the direction far from moving contact, at this moment
Electric arc is gradually risen by gradually rapid elongation, arc voltage.When static contact moves to the maximum pressure of power spring round about
At this moment the arc voltage of arc length longest when contracting amount, generation is maximum, and current limitation effect is most strong, arc current sharp fall, but
Be at this moment after power spring on static contact start to spring back, the distance between dynamic/static contact starts to reduce again, and electric arc is being put out
Start to shorten again before going out, arc voltage lowers again, and such arc current can slowly be returned to zero naturally again.Thus keep away
Exempted from due to elongating arc arc voltage to be increased, in the case where dangerous significantly continuous current limliting under make arc stability
Zero passage.And cut-offfing for traditional low-voltage circuit breaker is that operating mechanism can only constantly open the gap increased between contact, it is only electric
Arc voltage constantly increases the process that can decline without voltage, this makes the excessive current limliting of system and leads to overvoltage.The present invention
Scheme can not only make the arc voltage of low-voltage circuit breaker have violent zooming process but also also contact gap reduction
Process, electric arc can also be stablized when electric arc is unable to maintain that, so that its steady zero passage.It is this to increase on the static contact of low pressure
One power spring has remarkable result to the performance boost of switch come the whole design for reducing system overvoltage.
What Fig. 2 gave proposition possesses current limiting low-voltage but the stroke curve figure of the low-voltage circuit breaker without overvoltage, in figure
Give three stroke curves.The curve that the stroke that curve 1 is done under the drive of spring by static contact changes over time；Curve
2 be the stroke curve for the operating mechanism being mounted on moving contact；The fortune that displacement of the curve 3 between dynamic/static contact changes over time
Moving curve.When moving contact and the respective velocity interpolation of static contact registration property shown in Fig. 2, just start between dynamic/static contact
It opens away from smaller, arc voltage is smaller, but opens and increase away from constantly linear, and arc voltage also constantly rises, but when maximum is opened
Away from when arc voltage generate maximum current limitation effect, overvoltage level is too high, and electric current declines rapidly, and current limitation effect is very strong, still
If maintaining so high current limitation effect that will have an impact to the insulation of protected device always, therefore wished when electric arc will extinguish
Prestige open away from reduce it is some come so that overvoltage reduce.What is occurred in the interrupting process of low-voltage circuit breaker is above by using Fig. 3 can
Clearly to express.
The space that this structure needs is bigger than traditional, in order to be suitble to the free extended length of spring.But spring is moving
During help extinguish electric arc, it is proper at the time of especially control when dynamic/static contact is just initially separated under the action of the spring
It is just that spring just moves in the opposite direction at once, that is, the length of electric arc quickly increases when starting arcing.And whole
The length of electric arc is nonlinear during a arcing, rather than the length of electric arc caused by other mechanisms is being drawn always
It is long.Make the voltage of electric arc adjustable in this way.
Claims (2)
1. a kind of low overvoltage low-voltage circuit breaker of current-limiting type, including moving contact, static contact, static conductive rod, moving conductive rod, insulation connect
Bar and operating mechanism, operating mechanism connect moving conductive rod by insulated connecting rod, the moving contact face static contact connected under moving conductive rod,
It is characterized in that, further including power spring, connected between static contact and static conductive rod with power spring.
2. the low overvoltage low-voltage circuit breaker of current-limiting type according to claim 1, which is characterized in that the low-voltage circuit breaker closes a floodgate
When, moving contact is closed on static contact and compression conductive spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810607684.XA CN108962646A (en) | 2018-06-13 | 2018-06-13 | The low overvoltage low-voltage circuit breaker of current-limiting type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810607684.XA CN108962646A (en) | 2018-06-13 | 2018-06-13 | The low overvoltage low-voltage circuit breaker of current-limiting type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108962646A true CN108962646A (en) | 2018-12-07 |
Family
ID=64488888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810607684.XA Pending CN108962646A (en) | 2018-06-13 | 2018-06-13 | The low overvoltage low-voltage circuit breaker of current-limiting type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108962646A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1992123A (en) * | 2005-10-28 | 2007-07-04 | 黑格电子股份有限公司 | Locking mechanism for electric appliance |
| JP4601408B2 (en) * | 2004-12-06 | 2010-12-22 | 三菱電機株式会社 | Switchgear |
| CN102630329A (en) * | 2009-09-29 | 2012-08-08 | 伊顿公司 | Circuit interrupter and receptacle including improved contact configuration |
-
2018
- 2018-06-13 CN CN201810607684.XA patent/CN108962646A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4601408B2 (en) * | 2004-12-06 | 2010-12-22 | 三菱電機株式会社 | Switchgear |
| CN1992123A (en) * | 2005-10-28 | 2007-07-04 | 黑格电子股份有限公司 | Locking mechanism for electric appliance |
| CN102630329A (en) * | 2009-09-29 | 2012-08-08 | 伊顿公司 | Circuit interrupter and receptacle including improved contact configuration |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181207 |