CN202712827U - Protection device of switch cabinet - Google Patents
Protection device of switch cabinet Download PDFInfo
- Publication number
- CN202712827U CN202712827U CN 201220316274 CN201220316274U CN202712827U CN 202712827 U CN202712827 U CN 202712827U CN 201220316274 CN201220316274 CN 201220316274 CN 201220316274 U CN201220316274 U CN 201220316274U CN 202712827 U CN202712827 U CN 202712827U
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- CN
- China
- Prior art keywords
- signal
- microprocessor
- amplification module
- zero sequence
- sequence 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 - Fee Related
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Abstract
The utility model discloses a protection device of a switch cabinet comprising a zero sequence current transformer, which can be used to process the acquired current of a three-phase main circuit; a conversion amplification module, which can be used for the conversion and the amplification of a signal provided by the zero sequence current transformer; a microprocessor, which can be used for the sampling of the signal of the conversion amplification module, and can be used to determine whether the signal level belongs to the short circuit or the overload according to the predetermined process, and can be used to send the chopping signal according to the determination result; an amplifier, which can be used to amplify the chopping signal output by the microprocessor; a tripping device, which can be used to disconnect a contact of the tripping device and the three-phase main circuit after receiving the chopping signal output by the amplifier. The protection device has advantages of small size, convenient installation, and ability of cutting off the failed device in the electric power system.
Description
Technical field
The utility model relates to the switch cubicle in the electric power system, is specifically related to a kind of protective device of switch cubicle.
Background technology
Various faults or unsafe situation may occur in electric power system in running, usually adopt the relaying protection measure that faulty equipment is excised from electric power system, to guarantee the continuation operation of non-faulty component.In protective relaying device; usually adopt circuit breaker that short circuit or overload situations are protected, because the volume of circuit breaker is large, is installed in the volume that makes switch cubicle in the switch cubicle and increases; therefore not only be an impediment to assembling, and also larger from its operation easier of maintainability aspect.
Summary of the invention
For above-mentioned technical problem, the purpose of this utility model provides a kind of protective device and method of switch cubicle, and the utility model can make the faulty equipment in the electric power system excise fast, and has volume little, advantage easy for installation.
The technical scheme that realizes the utility model purpose is as follows:
The guard method of switch cubicle may further comprise the steps:
Step 1 gathers electric current and the processing of three-phase major loop by zero sequence current mutual inductor;
Step 2 is changed and is amplified by conversion amplification module signal that zero sequence current mutual inductor is provided;
Step 3 is sampled to the signal of conversion amplification module by microprocessor, judges that according to default program the grade of signal belongs to short circuit or overload, sends break signal according to the result who judges;
Step 4, amplifier amplifies the break signal of microprocessor output;
Step 5 after the break signal of release reception amplifier output, makes the contact that is connected to the release in the three-phase major loop disconnect the three-phase major loop.
In the step 2, if the signal that zero sequence current mutual inductor provides is low level, then changes amplification module and do not amplify processing; If the signal that zero sequence current mutual inductor provides is high level, then changes amplification module and amplify according to the amplitude of calculating signal.
The protective device of switch cubicle comprises zero sequence current mutual inductor, and the electric current of the three-phase major loop that gathers is processed; And
The conversion amplification module, the signal that zero sequence current mutual inductor is provided is changed and is amplified; And
Microprocessor is sampled to the signal of conversion amplification module, judges that according to default program the grade of signal belongs to short circuit or overload, sends break signal according to the result who judges; And
Amplifier amplifies the break signal of microprocessor output; And
Release after the break signal of reception amplifier output, makes the contact that is connected to the release in the three-phase major loop disconnect the three-phase major loop.
Adopted such scheme, the utility model gathers by the electric current of zero sequence current mutual inductor to the three-phase major loop, electric current is changed and amplified by the conversion amplification module, by microprocessor the type of signal is judged, to debate not out of order type, send break signal the faulty equipment that is connected on the major loop is disconnected, and do not affect all the other equipment work.The utility model has volume little by the integrated circuit that several circuit modules form, and is convenient to the advantage of safeguarding and installing.
Description of drawings
Fig. 1 is the circuit block diagram of the protective device of switch cubicle in the utility model;
Embodiment
With reference to Fig. 1, the protective device of switch cubicle of the present utility model comprises zero sequence current mutual inductor 10, and the electric current of the three-phase major loop that gathers is processed; And
The utility model also provides a kind of guard method of switch cubicle, may further comprise the steps:
Step 1 gathers electric current and the processing of three-phase major loop by zero sequence current mutual inductor 10.The signal that zero sequence current mutual inductor 10 gathers has three kinds of situations, and the first is low level, and namely the electric current sum of three-phase major loop is zero; The second is high level, and the high level letter represents normal voltage fluctuation, short circuit and transships three kinds of situations for No. 2.
Step 2 is changed and is amplified by conversion amplification module 20 signal that zero sequence current mutual inductor is provided.In the step 2, if the signal that zero sequence current mutual inductor provides is low level, then changes amplification module and do not amplify processing, directly export to microprocessor; If the signal that zero sequence current mutual inductor provides is high level, then changing amplification module amplifies according to the amplitude of calculating signal, in conversion amplification module 20, be provided with the multiplication factor district, this multiplication factor district carries out according to the type of high level representative, after conversion amplification module 20 receives high level, at first the amplitude of signal is calculated, taked concrete multiplication factor that it is amplified with correspondence.
Step 3 is sampled by the signal of 30 pairs of conversions of microprocessor amplification module, judges that according to default program the grade of signal belongs to short circuit or overload, sends break signal according to the result who judges.After sampling the signal that provides of conversion amplification module 20 by microprocessor 30, at first judge according to the level situation of signal, if low level, microprocessor is not done any processing, if high level, that is according to the amplitude situation of signal and default program, judge that this signal belongs to normal voltage fluctuation or short circuit or overload, if any processing is not still done in the normal voltage fluctuation, if short circuit or overload are then exported break signal.
Step 4, the break signal of 40 pairs of microprocessor outputs of amplifier is amplified.
Step 5 after the break signal of release 50 reception amplifiers output, makes the contact that is connected to the release in the three-phase major loop disconnect the three-phase major loop.
Claims (2)
1. the protective device of switch cubicle is characterized in that, comprises zero sequence current mutual inductor, and the electric current of the three-phase major loop that gathers is processed; And
The conversion amplification module, the signal that zero sequence current mutual inductor is provided is changed and is amplified; And
Microprocessor is sampled to the signal of conversion amplification module, judges that according to default program the grade of signal belongs to short circuit or overload, sends break signal according to the result who judges; And
Amplifier amplifies the break signal of microprocessor output; And
Release after the break signal of reception amplifier output, makes the contact that is connected to the release in the three-phase major loop disconnect the three-phase major loop.
2. the protective device of switch cubicle according to claim 1 is characterized in that, also comprises a keyboard, is used for changing the parameter-embedded of microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316274 CN202712827U (en) | 2012-06-30 | 2012-06-30 | Protection device of switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316274 CN202712827U (en) | 2012-06-30 | 2012-06-30 | Protection device of switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202712827U true CN202712827U (en) | 2013-01-30 |
Family
ID=47593092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220316274 Expired - Fee Related CN202712827U (en) | 2012-06-30 | 2012-06-30 | Protection device of switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202712827U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738778A (en) * | 2012-06-30 | 2012-10-17 | 常州市华贤五金厂 | Protection device and method of switch cabinet |
-
2012
- 2012-06-30 CN CN 201220316274 patent/CN202712827U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738778A (en) * | 2012-06-30 | 2012-10-17 | 常州市华贤五金厂 | Protection device and method of switch cabinet |
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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: 20130130 Termination date: 20130630 |