CN201117603Y - Short circuit short time-delay protector for low-voltage circuit breaker - Google Patents
Short circuit short time-delay protector for low-voltage circuit breaker Download PDFInfo
- Publication number
- CN201117603Y CN201117603Y CNU2007200740463U CN200720074046U CN201117603Y CN 201117603 Y CN201117603 Y CN 201117603Y CN U2007200740463 U CNU2007200740463 U CN U2007200740463U CN 200720074046 U CN200720074046 U CN 200720074046U CN 201117603 Y CN201117603 Y CN 201117603Y
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- circuit breaker
- voltage circuit
- processing unit
- judgment processing
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Abstract
A short circuit short relay protection device used in a low voltage circuit breaker consists of a tripping execution unit which is arranged in the low voltage circuit breaker, a current transformer unit and a microcontroller judgment processing unit. An iron core is arranged in the current transformer unit. The outer end of the current transformer unit is connected with the input end of the microcontroller judgment processing unit. The output end of the microcontroller judgment processing unit is connected with a shunt coil in a shunt release. The lower voltage circuit breaker is an automatic switch of DW10 serial. In the utility model, the current transformer is used for the real-time acquisition of a three-phase current passing through the low voltage circuit breaker and transmits current signals to the microcontroller judgment processing unit. The microcontroller judgment processing unit implements the real-time calculation processing on the current signals of every phase and controls the operation of the tripping execution unit. Through the microcontroller judgment processing unit, the setting value of a transient short-circuit current can be arranged precisely to adapt to the various requirements of a power system. An electromagnetic mechanism is used by the shunt release for breaking the low voltage circuit breaker, which works stably and reliably.
Description
Technical field:
The utility model relates to electricity field, relates in particular to electric component, particularly low-voltage circuit breaker, and concrete is a kind of short circuit short time delay protective device that is used for low-voltage circuit breaker.
Background technology:
DW10 series automatic switch is the low-voltage circuit breaker that has been widely used.Main as electric power system power distribution station distribution transforming low pressure main breaker and feeder line circuit breaker.When short trouble occurring on the circuit, the overcurrent instantaneous release action in the low-voltage circuit breaker makes switch trip; If press trip push button, make the shunt release energising, switch is tripped at a distance.In the prior art, DW10 series automatic switch only has the instantaneous trip defencive function, causes to lack temporal selectivity cooperation between power distribution station distribution transforming low pressure main breaker and the feeder line circuit breaker, can not satisfy the electrical network requirement.And the instantaneous trip setting value of DW10 series automatic switch can be adjusted to third gear, is respectively: 1In, 1.5In and 3In, but its instantaneous trip setting value gear is to realize by the length of adjusting a cylindrical extension spring.It adjusts principle: when the amount of tension of cylindrical extension spring is smaller, when surpassing spring free length, value of thrust is less, and the short circuit current electromagnetic attraction that it can overcome is also little, so current setting is low; In the time of when the amount of tension of cylindrical extension spring is bigger, in the limit of stretch scope, value of thrust is bigger, and the short circuit current electromagnetic attraction that it can overcome is also big, so the current setting height.Clearly; the method of adjusting the transient short-circuit current setting value by the extension spring length precision of adjusting is low; and the setting value discreteness is big; and along with the lengthening of running time, for example move more than 10 years, cylindrical extension spring can wear out; the power value reduces; thereby cause DW10 series automatic switch in the tripping operation of the moment of electric motor starting, for bigger continuation short circuit current, circuit breaker can not play the dropout protective effect.
Summary of the invention:
The purpose of this utility model provides a kind of short circuit short time delay protective device that is used for low-voltage circuit breaker, the described this short circuit short time delay protective device that is used for low-voltage circuit breaker to solve that prior art DW10 series automatic switch can not satisfy that electrical network requires, transient short-circuit current setting value precision is low and power distribution station distribution transforming low pressure main breaker and feeder line circuit breaker between lack the technical problem that temporal selectivity cooperates.
This short circuit short time delay protective device that is used for low-voltage circuit breaker of the present utility model is made of the dropout performance element that is arranged on low-voltage circuit breaker; described dropout performance element is a shunt release; be provided with the shunt opening coil in the described shunt release; wherein; be provided with a current transformer unit and a single-chip microcomputer judgment processing unit in the described low-voltage circuit breaker; described current transformer is provided with iron core in the unit; the output of current transformer unit is connected with the input of described single-chip microcomputer judgment processing unit, and the output of single-chip microcomputer judgment processing unit is connected with shunt opening coil in the described shunt release.
Further, described low-voltage circuit breaker is a DW10 series automatic switch.
Further, described single-chip microcomputer judgment processing unit is made of single-chip microcomputer.
Operation principle of the present utility model is: the current transformer of ribbon core is gathered in real time to the three-phase current through low-voltage circuit breaker, and current signal is delivered to single-chip microcomputer judgment processing unit; Single-chip microcomputer judgment processing unit to each phase current signal calculate in real time, judgment processing, send command signal to the dropout performance element then, when shunt release obtains the command signal electric current, its shunt opening coil produces excitatory, make sound adhesive unshakable in one's determination, thereby pulling draw bar disjunction low-voltage circuit breaker, and then disconnect main circuit.By setting, the setting value of transient short-circuit current can be set accurately to single-chip microcomputer judgment processing unit.
Concrete, the low-voltage circuit breaker described in the utility model is a DW10 series automatic switch of the prior art, the utility model can be realized by increase current transformer unit and single-chip microcomputer judgment processing unit in existing DW10 series automatic switch.Dropout performance element described in the utility model, shunt release, shunt opening coil, current transformer unit, single-chip microcomputer judgment processing unit and single-chip microcomputer also all can adopt known solution of the prior art, relevant DW10 series automatic switch, and dropout performance element, shunt release, shunt opening coil, current transformer unit, single-chip microcomputer judgment processing unit and single-chip microcomputer known solution in the prior art, those skilled in the art all understands, so do not repeat them here.
The utility model and prior art contrast, and its effect is actively with tangible.The utility model is provided with current transformer unit and single-chip microcomputer judgment processing unit in DW10 series automatic switch, utilize the current transformer of ribbon core that the three-phase current through low-voltage circuit breaker is gathered in real time, and current signal is delivered to single-chip microcomputer judgment processing unit, single-chip microcomputer judgment processing unit calculates in real time to each phase current signal, judgment processing, control the action of dropout performance element then, by setting to single-chip microcomputer judgment processing unit, the setting value of transient short-circuit current can accurately be set, adapt to the multiple requirement of electrical network, and need not to adjust extension spring length.Simultaneously, shunt release produces excitatory by its shunt opening coil, utilize electromagnetic mechanism disjunction low-voltage circuit breaker, and working stability is reliable.
Description of drawings:
Fig. 1 is the schematic diagram of a preferred embodiment of the short circuit short time delay protective device that is used for low-voltage circuit breaker of the present utility model.
Fig. 2 is the electrical schematic diagram that is used for the short circuit short time delay protective device of low-voltage circuit breaker of the present utility model.
Embodiment:
As shown in Figure 1; the short circuit short time delay protective device that is used for low-voltage circuit breaker of the present utility model; constitute by the dropout performance element 1 that is arranged in the low-voltage circuit breaker; described dropout performance element 1 is a shunt release; be provided with the shunt opening coil in the described shunt release; wherein; be provided with a current transformer unit 3 and a single-chip microcomputer judgment processing unit 2 in the described low-voltage circuit breaker; be provided with iron core in the described current transformer unit 3; the output of current transformer unit 3 is connected with the input of described single-chip microcomputer judgment processing unit 2, and the output of single-chip microcomputer judgment processing unit 2 is connected with shunt opening coil in the described shunt release.Current transformer unit 3 is connected with main circuit 4.Current transformer unit 3 and single-chip microcomputer judgment processing unit 2 all are arranged in the acquisition process unit.
Further, described low-voltage circuit breaker is a DW10 series automatic switch.
Further, described single-chip microcomputer judgment processing unit 2 is made of single-chip microcomputer.
Fig. 2 is the electrical schematic diagram that is used for the short circuit short time delay protective device of low-voltage circuit breaker of the present utility model.
Operation principle of the present utility model is: the current transformer of ribbon core is gathered in real time to the three-phase current through low-voltage circuit breaker, and current signal is delivered to single-chip microcomputer judgment processing unit 2; 2 pairs of each phase current signals in single-chip microcomputer judgment processing unit calculate in real time, judgment processing, send command signal to dropout performance element 1 then, when shunt release obtains the command signal electric current, its shunt opening coil produces excitatory, make sound adhesive unshakable in one's determination, thereby pulling draw bar disjunction low-voltage circuit breaker, and then disconnect main circuit.By setting, the setting value of transient short-circuit current and drop-away time can be set accurately to single-chip microcomputer judgment processing unit 2.
Claims (3)
1. short circuit short time delay protective device that is used for low-voltage circuit breaker; constitute by the dropout performance element that is arranged in the low-voltage circuit breaker; described dropout performance element is a shunt release; be provided with the shunt opening coil in the described shunt release; it is characterized in that: be provided with a current transformer unit and a single-chip microcomputer judgment processing unit in the described low-voltage circuit breaker; described current transformer is provided with iron core in the unit; the output of current transformer unit is connected with the input of described single-chip microcomputer judgment processing unit, and the output of single-chip microcomputer judgment processing unit is connected with shunt opening coil in the described shunt release.
2. the short circuit short time delay protective device that is used for low-voltage circuit breaker as claimed in claim 1 is characterized in that: described low-voltage circuit breaker is a DW10 series automatic switch.
3. the short circuit short time delay protective device that is used for low-voltage circuit breaker as claimed in claim 1 is characterized in that: described single-chip microcomputer judgment processing unit is made of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200740463U CN201117603Y (en) | 2007-08-24 | 2007-08-24 | Short circuit short time-delay protector for low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200740463U CN201117603Y (en) | 2007-08-24 | 2007-08-24 | Short circuit short time-delay protector for low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201117603Y true CN201117603Y (en) | 2008-09-17 |
Family
ID=39992184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200740463U Expired - Fee Related CN201117603Y (en) | 2007-08-24 | 2007-08-24 | Short circuit short time-delay protector for low-voltage circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201117603Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552160B (en) * | 2008-03-31 | 2012-01-11 | 北京人民电器厂有限公司 | Circuit protecting switch with delay control device |
| CN105529228A (en) * | 2016-01-28 | 2016-04-27 | 沈阳工业大学 | Controllable electromagnetic release capable of realizing short-circuit protection and control method |
| CN107742880A (en) * | 2017-11-24 | 2018-02-27 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of intelligent DC protection device and guard method |
-
2007
- 2007-08-24 CN CNU2007200740463U patent/CN201117603Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552160B (en) * | 2008-03-31 | 2012-01-11 | 北京人民电器厂有限公司 | Circuit protecting switch with delay control device |
| CN105529228A (en) * | 2016-01-28 | 2016-04-27 | 沈阳工业大学 | Controllable electromagnetic release capable of realizing short-circuit protection and control method |
| CN105529228B (en) * | 2016-01-28 | 2019-01-22 | 沈阳工业大学 | Controllable electromagnetic release capable of realizing short-circuit protection and control method |
| CN107742880A (en) * | 2017-11-24 | 2018-02-27 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of intelligent DC protection device and guard method |
| CN107742880B (en) * | 2017-11-24 | 2024-04-16 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Intelligent direct current protection device and protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20100824 |