CN200986907Y - Load limiting circuit breaker - Google Patents
Load limiting circuit breaker Download PDFInfo
- Publication number
- CN200986907Y CN200986907Y CN 200620067464 CN200620067464U CN200986907Y CN 200986907 Y CN200986907 Y CN 200986907Y CN 200620067464 CN200620067464 CN 200620067464 CN 200620067464 U CN200620067464 U CN 200620067464U CN 200986907 Y CN200986907 Y CN 200986907Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- tonnage
- limit
- microcontroller chip
- electric current
- 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.)
- Expired - Lifetime
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Abstract
The utility model discloses a load-limiting current breaker including a current transformer circuit, a three-phase rectifier circuit, a filter circuit and a peripheral circuit. The three-phase rectifier circuit connects with the filter circuit; an electromagnetic tripping coil is arranged in the peripheral circuit. The utility is characterized in that the output end of the current transformer circuit connects with a microcontroller chip of which power supply circuit mainly comprises the three-phase rectifier circuit and the filter circuit; the input end of the microcontroller chip connects with a current-limiting classifying circuit and the output end of the microcontroller chip connects with the electromagnetic tripping coil. The utility has a simple structure, which is convenient for installation and can protect the power supply equipment effectively.
Description
Technical field
The utility model relates to dynamo-electric field, more particularly relates to the limit for tonnage circuit breaker.
Background technology
At present, the circuit breaker that occurs on the market is most of, and standard code 1.05 In＞2h is failure to actuate owing to have long delay inverse time lag function, 1.3 In＜2h action, and promptly load current surpasses the circuit breaker rated operational current, and circuit breaker can be failure to actuate, and lacks fail safe.As application number is 00244841, the applying date is on October 31st, 2000, denomination of invention is an electronics current limliting adjustable circuit breaker, it is characterized in that: by the electric current mutual inductance circuit, rectified three-phase circuit, filter circuit, thick vlsi die, peripheral circuit is formed, the input of the output termination rectified three-phase circuit of electric current mutual inductance circuit wherein, the input of the output termination filter circuit of rectified three-phase circuit, 14 pin and 12 pin of the thick vlsi die of output termination of filter circuit, 8 of thick vlsi die, 9,10 pin connect the adjustable potentiometer in the peripheral circuit, 1 pin of thick vlsi die connects the electromagnetic trip coil in the peripheral circuit, 3 pin connect the anti-interference capacitor in the peripheral circuit, 6 of thick vlsi die, 7 pin connect power supply.This patent load current surpasses the circuit breaker rated operational current, and circuit breaker can be failure to actuate, and the long-term excess load electricity consumption of electricity consumption user causes great threat to electric power system.
Summary of the invention
The purpose of this utility model is exactly provide for the deficiency that solves prior art a kind of not only simple in structure but also the limit for tonnage circuit breaker of effectively protecting electric power system.
The utility model is to adopt following technical solution to realize above-mentioned purpose: a kind of limit for tonnage circuit breaker, comprise electric current mutual inductance circuit, rectified three-phase circuit, filter circuit and peripheral circuit, rectified three-phase circuit is connected with filter circuit, be provided with the electromagnetic trip coil in the peripheral circuit, it is characterized in that: the output of described electric current mutual inductance circuit connects microcontroller chip, connect limit for tonnage electric current stepping circuit on the input pin of microcontroller chip, the output pin of microcontroller chip links to each other with the electromagnetic trip coil.
As further specifying of such scheme, be provided with the integrated circuit of supervisory control system and time counter in the described microcontroller chip, the output of electric current mutual inductance circuit links to each other with this integrated circuit.
Described rectified three-phase circuit and filter circuit are connected on the power supply input pin of microcontroller chip as the power-supplying circuit of microcontroller chip.
Described limit for tonnage electric current stepping circuit mainly is made of resistance and photoelectric coding switch, and the sampling end of its stepping position links to each other with the input pin of microcontroller.
The beneficial effect that the utility model adopts above-mentioned technical solution to reach is:
1, the utility model adopts on the basis of existing circuit breaker and installs electronic trip unit additional, electronic trip unit mainly is made up of microcontroller chip, limit for tonnage electric current stepping circuit, the long delay anti-time limit characteristic is changed into the long delay difinite-time limit characteristic promptly also continue 30 seconds when load reaches circuit breaker volume operating current, circuit breaker is with disconnecting consumers, stop power supply, better meet for the distribution requirement thereby solve present circuit breaker existing problems.
2, the output of electric current mutual inductance circuit connects microcontroller chip; connect limit for tonnage electric current stepping circuit on the input pin of this microcontroller chip; integrated monitoring circuit and timer in the microcontroller chip; the electric current of arbitrary phase of electric current mutual inductance circuit in 30 seconds, surpass continuously this device preset the limit for tonnage current rating time will be in this delay time disjunction limit for tonnage circuit breaker, make circuit breaker accurately protect electric power system.
Description of drawings
Fig. 1 is a circuit theory schematic diagram of the present utility model;
Fig. 2 is the operation principle schematic diagram of limit for tonnage circuit breaker of the present utility model.
Embodiment
As Fig. 1, as shown in Figure 2, the utility model limit for tonnage circuit breaker, on the basis of existing circuit breaker, install electronic trip unit additional, constitute new tripping system, comprise electric current mutual inductance circuit, rectified three-phase circuit, filter circuit and peripheral circuit, rectified three-phase circuit is connected with filter circuit, current transformer CT
1, CT
2, CT
3Respectively A, B, C three-phase current are transformed to the detectable voltage signal of circuit and input to the 7th, 6,5 pin of microcontroller IC1 respectively, IC
1The 1st pin and the 8th pin power positive end and the negative terminal that are respectively microcontroller chip, its power-supplying circuit is respectively by D
1～D
4Bridge rectifier and R
2, R
3, ZD
1, C
2The step-down filter circuit of forming constitutes, and is provided with the integrated circuit of supervisory control system and time counter in the described microcontroller IC1, and microcontroller IC1 is to the three-phase current I of flow path A, B, C
A, I
B, I
CMonitor, if the electric current I of arbitrary phase
NIn 30 seconds, surpass the limit for tonnage current rating I that this device presets continuously
NOThe time will be in this delay time disjunction limit for tonnage circuit breaker, limit for tonnage current rating I
NOCarry out presetting of current rating by the limit for tonnage electric current stepping circuit that is connected on the microcontroller IC1 input pin, the stepping circuit of this limit for tonnage current rating is mainly by resistance R
12, R
13, R
14With the photoelectric coding switch SW
1Constitute, the sampling end of its stepping position inputs to IC
1The 3rd pin discern by microcontroller, when carrying out the disjunction function, IC
1The 2nd pin output high level makes controllable silicon SCR
1Conducting, this moment, two phase voltages imposed on the tripping coil JL, made the disjunction of limit for tonnage circuit breaker, capacitor C
1With resistance R
3Absorb as the silicon controlled capacitance-resistance.
In the use, make the photoelectric coding switch SW
1Resistance R with the limit for tonnage current rating
12, R
13, R
14One of them input contact join, carry out the presetting of current rating under the normal operation, passed through CT
1, CT
2, CT
3Current transformer is transformed to A, B, C three-phase current the detectable voltage signal of circuit respectively and inputs to the 7th, 6,5 pin of microcontroller IC1 respectively, the switch closure on A, B, the C input, and when circuit overloads, three-phase current I
A, I
B, I
CIn arbitrary phase current I
NIn 30 seconds, surpass the rated current I that presets continuously
NO, IC
1The 2nd pin output high level makes controllable silicon SCR
1Conducting, two phase voltages impose on the tripping coil JL, and the switch that drives on A, B, the C input disconnects, and stops power supply.
Claims (4)
1, a kind of limit for tonnage circuit breaker, comprise electric current mutual inductance circuit, rectified three-phase circuit, filter circuit and peripheral circuit, rectified three-phase circuit is connected with filter circuit, be provided with the electromagnetic trip coil in the peripheral circuit, it is characterized in that: the output of described electric current mutual inductance circuit connects microcontroller chip, connect limit for tonnage electric current stepping circuit on the input pin of microcontroller chip, the output pin of microcontroller chip links to each other with the electromagnetic trip coil.
2, limit for tonnage circuit breaker according to claim 1 is characterized in that: described rectified three-phase circuit and filter circuit are connected on the power supply input pin of microcontroller chip as the power-supplying circuit of microcontroller chip.
3, limit for tonnage circuit breaker according to claim 1 is characterized in that: be provided with the integrated circuit of supervisory control system and time counter in the described microcontroller chip, the output of electric current mutual inductance circuit links to each other with this integrated circuit.
4, limit for tonnage circuit breaker according to claim 1 is characterized in that: described limit for tonnage electric current stepping circuit mainly is made of resistance and photoelectric coding switch, and the sampling end of its stepping position is connected with the input pin of microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620067464 CN200986907Y (en) | 2006-11-10 | 2006-11-10 | Load limiting circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620067464 CN200986907Y (en) | 2006-11-10 | 2006-11-10 | Load limiting circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200986907Y true CN200986907Y (en) | 2007-12-05 |
Family
ID=38916366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620067464 Expired - Lifetime CN200986907Y (en) | 2006-11-10 | 2006-11-10 | Load limiting circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200986907Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103348552A (en) * | 2011-03-16 | 2013-10-09 | 菲尼克斯电气公司 | Electrical apparatus for the short-circuit protection of a three-phase load in a three-phase system |
-
2006
- 2006-11-10 CN CN 200620067464 patent/CN200986907Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103348552A (en) * | 2011-03-16 | 2013-10-09 | 菲尼克斯电气公司 | Electrical apparatus for the short-circuit protection of a three-phase load in a three-phase system |
| US9300126B2 (en) | 2011-03-16 | 2016-03-29 | Phoenix Contact Gmbh & Co Kg | Electrical apparatus for the short-circuit protection of a three-phase load in a three-phase system |
| CN103348552B (en) * | 2011-03-16 | 2016-04-06 | 菲尼克斯电气公司 | For the electric equipment of threephase load short-circuit protection in three-phase system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG NANGUAN ELECTRIC CO., LTD. Free format text: FORMER NAME: FOSHAN NANDIAN SWITCH CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528000 Guangdong Province Nanhai District of Foshan city streets Guicheng Pingzhou Pingxi Industrial Zone A block two Patentee after: GUANGDONG NANGUAN ELECTRICAL CO., LTD. Address before: 528000 Guangdong Province, Foshan city Chancheng District GUI LAN Lu Heng Da Gong Ye Qu Q Patentee before: Foshan Nandian Switch Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20071205 |
|
| EXPY | Termination of patent right or utility model |