CN101345407A - Creepage breaker - Google Patents
Creepage breaker Download PDFInfo
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- CN101345407A CN101345407A CNA2008101201233A CN200810120123A CN101345407A CN 101345407 A CN101345407 A CN 101345407A CN A2008101201233 A CNA2008101201233 A CN A2008101201233A CN 200810120123 A CN200810120123 A CN 200810120123A CN 101345407 A CN101345407 A CN 101345407A
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Abstract
The invention relates to a residual current circuit breaker in order to solve the technical problem of bad electromagnetic compatibility anti-jamming performance of the residual current circuit breaker in the prior art. The residual current circuit breaker comprises a bridge-type rectification circuit connected with an ac power supply, a mechanical tripping switch and unidirectional silicon controlled rectifier arranged in the ac power line and a parallel resonance circuit formed by a resonant capacitor and a first current transformer for testing the ac power supply. An electromagnet coil of the mechanical tripping switch is arranged in the circuit of the ac end in the bridge-type rectification circuit. A pole and K pole of the unidirectional silicon controlled rectifier respectively connect with the positive terminal and the negative terminal of the bridge-type rectification circuit and the G pole connects with the parallel resonance circuit with a resonance frequency of 50Hz.
Description
Technical field
The present invention relates to a kind of residual current circuit breaker, especially a kind of 30mA residual current circuit breaker that meets the GB14048.2-2001 standard.
Background technology
Chinese patent literature CN2354282Y discloses a kind of display type family expenses zero disconnected residual current circuit breaker, is made up of governor circuit, comparison circuit, hookup etc., and its governor circuit and controllable silicon all are parallel with piezo-resistance.
Chinese patent literature CN2276678Y discloses a kind of single-phase zero disconnected earth leakage protective device; increase by an OR circuit in the earth leakage protective device of machinery dropout switch electromagnet coil, one-way SCR element and diode sequence electric connection structure; two diodes of connecting in the OR circuit are electrically connected with the electromagnet coil of one-way SCR element, mechanical dropout switch in proper order by conducting direction is consistent; the negative electrode of another diode is electrically connected with lead between two series diodes, and anode is electrically connected with the ground wire binding post.
Above-mentioned the deficiencies in the prior art part is: the electromagnetic compatibility interference free performance of existing residual current circuit breaker is poor.
Summary of the invention
Technical problem to be solved by this invention provides the strong and difficult residual current circuit breaker that misoperation takes place of a kind of interference free performance.
For solving the problems of the technologies described above, the invention provides a kind of residual current circuit breaker, comprising: be used for the bridge rectifier that links to each other with AC power, the machinery dropout switch that is used to be arranged on AC power line, one-way SCR and by resonant capacitance be used to detect the shunt-resonant circuit that first current transformer of AC power constitutes; The electromagnet coil of machinery dropout switch is located in the loop of interchange end of described bridge rectifier; The A utmost point of one-way SCR and the K utmost point connect the positive terminal and the negative pole end of described bridge rectifier respectively, and the G utmost point of one-way SCR links to each other with described shunt-resonant circuit; The resonance frequency of described shunt-resonant circuit is 50Hz.
In the technique scheme, the inductance value of first current transformer is for being not less than 20H in the described shunt-resonant circuit; Or, also comprise second current transformer that is in series with first current transformer in the described shunt-resonant circuit; The inductance value sum of first current transformer and second current transformer is not less than 20H.
In the technique scheme, also comprise the snowslide voltage-stabiliser tube that is in parallel with described shunt-resonant circuit, and the anode of snowslide voltage-stabiliser tube links to each other extremely with the G of one-way SCR.
In the technique scheme, also comprise the low pass worry wave circuit that extremely links to each other with the G of described one-way SCR; Low pass is considered wave circuit and is comprised: the magnetic bead between the G utmost point of second electric capacity, the 3rd resistance, the anode of being located at the snowslide voltage-stabiliser tube and one-way SCR; Be located at after the series connection of second electric capacity and the 3rd resistance between the G utmost point of the negative electrode of snowslide voltage-stabiliser tube and one-way SCR.
The present invention has positive effect: among (1) the present invention, the resonance frequency of shunt-resonant circuit is 50Hz, and is identical with the frequency of city's AC power of China.When electric leakage took place AC power, the electric leakage signal that current transformer obtains also was 50Hz.Characteristic according to the shunt-resonant circuit, when the shunt-resonant circuit is in resonance, can make the triggering silicon controlled usefulness of the electric leakage signal of 50Hz be in the best, to trigger controllable silicon most effectively, make the triggering silicon controlled usefulness of 50Hz interference signal in addition lower simultaneously, thereby can effectively suppress the interference signal beyond the 50Hz.Therefore, the strong and difficult generation misoperation of residual current circuit breaker interference free performance of the present invention.(2) in the prior art, in the detection loop of the 220V city at residual current circuit breaker place alternating current, (for example there is a hard pulse interference signal, 250A, the forward position is 8 microseconds, the back is along being the spike of 20 microseconds) often make current transformer generation magnetic saturation, thereby destroyed the resonance frequency of shunt-resonant circuit,, thereby made the residual current circuit breaker misoperation of prior art because of the subharmonic of the non-linear generation of current transformer magnetic saturation can trigger controllable silicon.And in the present invention, the inductance value of the current transformer that adopts in the described shunt-resonant circuit is not less than 20H; To guarantee that described hard pulse interference signal (250A, the forward position is 8 microseconds, the back is along being the spike of 20 microseconds) can not make current transformer generation magnetic saturation, has prevented that subharmonic from triggering the silicon controlled situation.(3) among the present invention, the shunt-resonant circuit is parallel with the snowslide voltage-stabiliser tube, and the anode of snowslide voltage-stabiliser tube extremely links to each other with the G of one-way SCR.The forward conduction voltage of described snowslide voltage-stabiliser tube is not higher than 0.55V, and the trigger voltage of described one-way SCR is not less than 0.56V.When the external interference signal was invaded, interference signal had been got rid of in the at first conducting of snowslide voltage-stabiliser tube rapidly, triggers controllable silicon to prevent it, and misoperation takes place.(4) among the present invention, the G utmost point of described unidirectional controllable silicon S CR is connected with low pass and considers wave circuit, is used to filter high-frequency interferencing signal, further guarantees the reliability of residual current circuit breaker.
Description of drawings
Fig. 1 is the electrical schematic diagram of residual current circuit breaker of the present invention.
Embodiment
(embodiment 1)
See Fig. 1, the residual current circuit breaker of present embodiment comprises: be used for that the bridge rectifier (comprising diode D1, D2, D3 and D4) that links to each other with AC power, the machinery dropout K switch 1 that is used for being arranged on AC power line (being the label 1 and 2 of Fig. 1), unidirectional controllable silicon S CR, snowslide voltage-stabiliser tube DW, low pass are considered wave circuit and by resonant capacitance C1, be used to detect the first current transformer H1 of electric leakage signal of AC power and the shunt-resonant circuit that the second current transformer H2 constitutes.
The electromagnet coil KM of machinery dropout K switch 1 is located in the loop of interchange end of described bridge rectifier; Low pass is considered wave circuit and is extremely linked to each other with the G of described unidirectional controllable silicon S CR; In 30 milliamperes circuit breaker, low pass is considered wave circuit and is comprised: the magnetic bead L1 between the G utmost point of second capacitor C 2, the 3rd resistance R 3, the anode of being located at snowslide voltage-stabiliser tube DW and unidirectional controllable silicon S CR; Be located at after second capacitor C 2 and the series connection of the 3rd resistance R 3 between the G utmost point of the negative electrode of snowslide voltage-stabiliser tube DW and unidirectional controllable silicon S CR.Low pass is considered wave circuit, is used to filter high-frequency interferencing signal, further guarantees the reliability of residual current circuit breaker.
In 50 or 70 milliamperes circuit breaker, magnetic bead L1 is replaceable to be resistance, and this resistance is connected with second capacitor C 2 and constituted low pass worry ripple device, and magnetic bead L1 is replaced by the effect that resistance can reduce cost and not influence low pass worry ripple.
The A utmost point of unidirectional controllable silicon S CR and the K utmost point connect the positive terminal and the negative pole end of described bridge rectifier respectively, link to each other with described shunt-resonant circuit behind the G utmost point series connection magnetic bead L1 of unidirectional controllable silicon S CR.
The inductance value sum of the first current transformer H1 and the second current transformer H2 is 20H, and the capacitance of resonant capacitance C1 is 0.5uF, and therefore the resonance frequency of described shunt-resonant circuit is 50Hz.Characteristic according to the shunt-resonant circuit, when resonance takes place in the shunt-resonant circuit, can make the triggering silicon controlled usefulness of the interference signal of 50Hz be in the best, to trigger controllable silicon most effectively, make the triggering silicon controlled usefulness of 50Hz interference signal in addition lower simultaneously, thereby can effectively suppress the interference signal beyond the 50Hz.Therefore, the strong and difficult generation misoperation of residual current circuit breaker interference free performance of the present invention.First current transformer H1 that is in series and the inductance value sum of the second current transformer H2 are 20H, when thereby the residual current circuit breaker that makes present embodiment is applied in the 220V city alternating current, current transformer wherein is difficult for magnetic saturation takes place, and has prevented that subharmonic from triggering the silicon controlled situation.
Snowslide voltage-stabiliser tube DW and shunt-resonant circuit are in parallel, and the anode of snowslide voltage-stabiliser tube DW extremely links to each other with the G of unidirectional controllable silicon S CR.The forward conduction voltage of described snowslide voltage-stabiliser tube DW is not higher than 0.55V, and the trigger voltage of described unidirectional controllable silicon S CR is not less than 0.56V.Also comprise first resistance R 1 and second resistance R 2 that are in parallel with snowslide voltage-stabiliser tube DW; S1 is the experiment button, plays the simulation electric leakage during use.Link to each other with AC power behind the experiment button S1 series connection dropping resistor R4.
In other embodiments, only adopting an inductance value in the described shunt-resonant circuit is the current transformer of 20H or 25H, and the capacitance of corresponding resonant capacitance C1 is 0.5uF or 0.4uF.
Claims (5)
1, a kind of residual current circuit breaker comprises bridge rectifier, mechanical dropout switch (K1), one-way SCR (SCR) and the shunt-resonant circuit that is made of resonant capacitance (C1) and first current transformer (H1);
The electromagnet coil (KM) of machinery dropout switch (K1) is located in the loop of interchange end of described bridge rectifier; The A utmost point of one-way SCR (SCR) and the K utmost point connect the positive terminal and the negative pole end of described bridge rectifier respectively, and the G utmost point of one-way SCR (SCR) links to each other with described shunt-resonant circuit;
It is characterized in that: the resonance frequency of described shunt-resonant circuit is 50Hz.
2, the described residual current circuit breaker of claim 1 is characterized in that: the inductance value of first current transformer (H1) is not less than 20H in the described shunt-resonant circuit; Or, also comprise second current transformer (H2) that is in series with first current transformer (H1) in the described shunt-resonant circuit; First current transformer (H1) is not less than 20H with the inductance value sum of second current transformer (H2).
3, residual current circuit breaker according to claim 1 and 2 is characterized in that: also comprise the snowslide voltage-stabiliser tube (DW) that is in parallel with described shunt-resonant circuit, and the anode of snowslide voltage-stabiliser tube (DW) links to each other extremely with the G of one-way SCR (SCR).
4, residual current circuit breaker according to claim 3 is characterized in that: the forward conduction voltage of described snowslide voltage-stabiliser tube (DW) is not higher than 0.55V, and the trigger voltage of described one-way SCR (SCR) is not less than 0.56V.
5, residual current circuit breaker according to claim 3 is characterized in that: also comprise the low pass worry wave circuit that extremely links to each other with the G of described one-way SCR (SCR); Low pass is considered wave circuit and is comprised: the magnetic bead (L1) between the G utmost point of second electric capacity (C2), the 3rd resistance (R3), the anode of being located at snowslide voltage-stabiliser tube (DW) and one-way SCR (SCR); Be located at after the series connection of second electric capacity (C2) and the 3rd resistance (R3) between the G utmost point of the negative electrode of snowslide voltage-stabiliser tube (DW) and one-way SCR (SCR).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101201233A CN101345407B (en) | 2008-07-29 | 2008-07-29 | Creepage breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101201233A CN101345407B (en) | 2008-07-29 | 2008-07-29 | Creepage breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101345407A true CN101345407A (en) | 2009-01-14 |
| CN101345407B CN101345407B (en) | 2011-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101201233A Active CN101345407B (en) | 2008-07-29 | 2008-07-29 | Creepage breaker |
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| CN (1) | CN101345407B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850140A (en) * | 2019-09-27 | 2020-02-28 | 温彦衫 | Current measurement method for leakage protection by using mutual inductor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033427A (en) * | 1987-12-03 | 1989-06-14 | 内蒙古自治区赤峰红山机电研究所 | Protector circuit against electric leakage |
| CN2354282Y (en) * | 1999-02-04 | 1999-12-15 | 李乾良 | Displaying type domestic zero power-off leakage breaker |
| CN2394343Y (en) * | 1999-10-19 | 2000-08-30 | 李洪峰 | Socket with leakage protector |
| CN2750429Y (en) * | 2004-11-24 | 2006-01-04 | 李木土 | Electric assembly having changing air gap effect |
-
2008
- 2008-07-29 CN CN2008101201233A patent/CN101345407B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850140A (en) * | 2019-09-27 | 2020-02-28 | 温彦衫 | Current measurement method for leakage protection by using mutual inductor |
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| Publication number | Publication date |
|---|---|
| CN101345407B (en) | 2011-05-25 |
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Owner name: ZHEJIANG PEOPLE ELECTRICAL APPLIANCE CO., LTD. Free format text: FORMER OWNER: PEOPLE ELECTRICAL APPLIANCES GROUP CO., LTD. Effective date: 20140604 |
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Effective date of registration: 20140604 Address after: 325604, Yueqing, Zhejiang province Liushi town wide industrial zone Patentee after: Zhejiang People Electrical Appliance Co., Ltd. Address before: 325604 Liushi people's Industrial Park, Zhejiang, Yueqing Patentee before: People Electrical Appliances Group Co., Ltd. |