CN202285114U - Multifunctional microcomputer protection device - Google Patents
Multifunctional microcomputer protection device Download PDFInfo
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- CN202285114U CN202285114U CN2011203741341U CN201120374134U CN202285114U CN 202285114 U CN202285114 U CN 202285114U CN 2011203741341 U CN2011203741341 U CN 2011203741341U CN 201120374134 U CN201120374134 U CN 201120374134U CN 202285114 U CN202285114 U CN 202285114U
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Abstract
The utility model provides a multifunctional microcomputer protection device. The device comprises a data acquisition system, a CPU system and an input and output system, wherein values measured by a PT (Potential Transformer) and a CT (Current Transformer) in the data acquisition system are converted into low voltage, the low voltage is then transferred to a multi-way change-over switch after being subject to analog filtering and shaping, and is finally subject to A/D (Analog/Digital) conversion to be converted into microcomputer identification language, and the microcomputer identification language is input into a microcomputer; the CPU system is connected with the data acquisition system, draws conclusions after analysis, conveys a command to the input and output system, and sends out an action instruction; and the input and output system is connected with the data acquisition system and the CPU system and used for modifying parameters of a keyboard and sending the modified parameters to the CPU system and a display. Therefore, the utility model has the advantages that the power supply is changed into two different voltage grades close to the actual situation at the power supply part, current and zero sequence current measurement is introduced as a criterion, and when a load influences the power supply, the microcomputer device gives an alarm or directly acts to protect or cut off the faulty line according to different situations.
Description
Technical field
The utility model relates to a kind of microcomputer device, especially relates to a kind of multifunctional microcomputer protective device.
Background technology
At present, known each colleges and universities' multifunctional microcomputer protective device mainly is made up of microcomputer device, voltage transformer (VT) and transformer etc.And be criterion with voltage measuring transformer voltage, primary power is through voltage measuring transformer dead electricity whether, and then judges whether the standby power supply that closes a floodgate.And in the actual commercial production, even power supply is supplied power and the power supply quality of the direct vivid power supply of payload and safe reliability to load; Simultaneously if the zero-sequence current that single-phase earthing produced of circuit also can not be ignored; This then electric current and zero-sequence current become two very important electric parameters as a reference, excessive or circuit single-phase earthing is a criterion with voltage only when load current, possibly cause judging by accident tripping; When power supply is not afforded to do load; Load current will rise or zero-sequence current exists in equipment for a long time, all will speed up consumer and wear out, and seriously possibly cause its damage to cause producing and personal safety.
The utility model content
The utility model mainly is to solve the existing in prior technology technical matters; Providing a kind of not only becomes power supply and two kinds of actual approaching different electric pressures at power unit; And introduce electric current and zero sequence current measurement as criterion; When load when influence power supply, microcomputer device gives a warning according to different situations or a kind of multifunctional microcomputer protective device of faulty line is excised in the direct action protection.
The above-mentioned technical matters of the utility model mainly is able to solve through following technical proposals:
A kind of multifunctional microcomputer protective device is characterized in that, comprising:
Data acquisition system (DAS): in the data acquisition system (DAS) PT and CT measuring amount through being converted into low-voltage, via after the analog filtering shaping to the multichannel switch, be converted into the microcomputer identifiable language by A/D and input to microcomputer;
The cpu system that is connected with said data acquisition system (DAS): cpu system analyze to judgement, and with pass down the line to input-output system, will move the indication send;
The input-output system that is connected with cpu system with said data acquisition system (DAS) simultaneously: with sending to cpu system and demonstration after the modification of parameter keyboard.
At above-mentioned a kind of multifunctional microcomputer protective device, said data acquisition system (DAS) comprises:
PT data processing equipment: be used for voltage measurement signal is processed into the signal that CPU receives processing easily.
CT data processing equipment: be used for current measurement signal is processed into the signal that CPU receives processing easily.
The multicircuit switch that respectively said PT data processing equipment is linked to each other with the CT data processing equipment:
The A/D modular converter that links to each other with said multicircuit switch:
At above-mentioned a kind of multifunctional microcomputer protective device, said PT data processing equipment comprises continuous successively:
PT exchanges interface: be used for different ac voltage signals is inserted microcomputer respectively.
PT low voltage transition module: be used for voltage signal with forceful electric power voltage be converted into CPU can security identification voltage.
PT analog filter block: be used for the voltage signal of input CPU is carried out shaping, make CPU more can receive signal clearly.
At above-mentioned a kind of multifunctional microcomputer protective device, said CT data processing equipment comprises continuous successively:
CT exchanges interface: be used for different ac current signals is inserted microcomputer respectively.
CT low voltage transition module: be used for current signal with forceful electric power voltage be converted into CPU can security identification the magnitude of current.
CT analog filter block: be used for the current signal of input CPU is carried out shaping, make CPU more can receive signal clearly.
At above-mentioned a kind of multifunctional microcomputer protective device, said cpu system comprises: microprocessor (80C196KC), ROM (read-only memory) (EPROM), random-access memory (ram) and programmable logic processor (E
2PROM) etc.
At above-mentioned a kind of multifunctional microcomputer protective device, said input-output system comprises:
8255 interfaces able to programme and PIO interface: be used for expansion interface and confirm the apparatus measures function.
Photoelectric isolation module: externally measured signal and cpu system are effectively isolated, be used to reduce the interference of external signal, improve the stability of system to cpu system.
I/O interface: be used for confirming the measurement function selection of instrument.
Display and keyboard: be used for measurement data and action message and intuitively inform operator and handled easily person and the program setting valve is made amendment and select.
Therefore, the utlity model has following advantage: 1. reasonable in design, simple in structure and complete practicality; 2. not only power supply is become and two kinds of actual approaching different electric pressures at power unit; And introduce electric current and zero sequence current measurement as criterion; When load influenced power supply, microcomputer device gave a warning according to different situations or direct action protection excision faulty line.
Description of drawings
Fig. 1 is the structural principle synoptic diagram of the utility model.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of the utility model.
Embodiment:
A kind of multifunctional microcomputer protective device comprises:
1. data acquisition system (DAS): in the data acquisition system (DAS) PT and CT measuring amount through being converted into low-voltage, via after the analog filtering shaping to the multichannel switch, be converted into the microcomputer identifiable language by A/D and input to microcomputer; Data acquisition system (DAS) comprises:
PT data processing equipment: be used for voltage measurement signal is processed into the signal that CPU receives processing easily.The PT data processing equipment comprises continuous successively: PT exchanges interface: be used for different ac voltage signals is inserted microcomputer respectively.PT low voltage transition module: be used for voltage signal with forceful electric power voltage be converted into CPU can security identification voltage.PT analog filter block: be used for the voltage signal of input CPU is carried out shaping, make CPU more can receive signal clearly.
CT data processing equipment: be used for current measurement signal is processed into the signal that CPU receives processing easily.The CT data processing equipment comprises continuous successively: CT exchanges interface: be used for different ac current signals is inserted microcomputer respectively.CT low voltage transition module: be used for current signal with forceful electric power voltage be converted into CPU can security identification the magnitude of current.CT analog filter block: be used for the current signal of input CPU is carried out shaping, make CPU more can receive signal clearly.
The multicircuit switch that respectively said PT data processing equipment is linked to each other with the CT data processing equipment: the A/D modular converter that links to each other with said multicircuit switch:
2. the cpu system that is connected with data acquisition system (DAS): cpu system analyze to judgement, and with pass down the line to input-output system, will move the indication send; Cpu system comprises: microprocessor, the ROM (read-only memory) that links to each other with microprocessor, the RAS that links to each other with microprocessor and the programmable logic processor that links to each other with microprocessor.
3. the input-output system that is connected with cpu system with said data acquisition system (DAS) simultaneously: the importation again can be with sending to cpu system and demonstration after the modification of parameter keyboard.Input-output system comprises: 8255 interfaces able to programme and PIO interface: be used for expansion interface and confirm the apparatus measures function.Photoelectric isolation module: externally measured signal and cpu system are effectively isolated, be used to reduce the interference of external signal, improve the stability of system to cpu system.I/O interface: be used for confirming the measurement function selection of instrument.Display and keyboard: be used for measurement data and action message and intuitively inform operator and handled easily person and the program setting valve is made amendment and select.
In the embodiment shown in fig. 1, in the data acquisition system (DAS) PT and CT measuring amount through being converted into low-voltage, via after the analog filtering shaping to the multichannel switch, be converted into the microcomputer identifiable language by A/D and input to microcomputer.By cpu system analyze to judgement, and with pass down the line to input-output system, will move the indication send.In input-output system, cpu system and demonstration are sent to after the parameter keyboard being revised again in the importation.
In another embodiment shown in Figure 2; For the zero-sequence current with the A relative ground circuit forms example, represent with the electric capacity that C0G, C0 I, C0 II, C0 III etc. are concentrated, after circuit III A phase ground connection; If ignore the voltage drop on line impedance of load current and capacitance current; Then total system A voltage relatively is equal to zero, thereby each element A capacitance current leaf relatively equals zero, simultaneously B mutually with all raise 3 times of √ of C voltage-to-ground and capacitance current leaf mutually; Capacitance current in this case distributes, and in Fig. 2, representes with " → ".
On the circuit I of non-fault, the A phase current is zero, and B has the capacitance current of itself mutually with the middle mutually stream of C, and therefore, the zero-sequence current that is reacted at circuit top does
3I0Ⅰ=?IBⅠ+ICⅠ
Its effective value is 3I0 I=3U Φ ω C0 I
Occur in the circuit III of fault, go up mutually with C mutually at B, the same with the circuit of non-fault, stream has the capacitance current of itself, and its effective value is an ID=3 U Φ ω C0 ∑
The C0 ∑ is the every summation of electric capacity relatively of total system in the formula.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.
Claims (6)
1. a multifunctional microcomputer protective device is characterized in that, comprising:
Data acquisition system (DAS): in the data acquisition system (DAS) PT and CT measuring amount through being converted into low-voltage, via after the analog filtering shaping to the multichannel switch, be converted into the microcomputer identifiable language by A/D and input to microcomputer;
The cpu system that is connected with said data acquisition system (DAS): cpu system analyze to judgement, and with pass down the line to input-output system, will move the indication send;
The input-output system that is connected with cpu system with said data acquisition system (DAS) simultaneously: with sending to cpu system and demonstration after the modification of parameter keyboard.
2. a kind of multifunctional microcomputer protective device according to claim 1 is characterized in that said data acquisition system (DAS) comprises:
PT data processing equipment: be used for voltage measurement signal is processed into the signal that CPU receives processing easily;
CT data processing equipment: be used for current measurement signal is processed into the signal that CPU receives processing easily;
The multicircuit switch that respectively said PT data processing equipment is linked to each other with the CT data processing equipment;
The A/D modular converter that links to each other with said multicircuit switch.
3. a kind of multifunctional microcomputer protective device according to claim 2 is characterized in that, said PT data processing equipment comprises continuous successively:
PT exchanges interface: be used for ac voltage signal is inserted microcomputer respectively;
PT low voltage transition module: be used for voltage signal with forceful electric power voltage be converted into CPU can security identification voltage;
PT analog filter block: be used for the voltage signal of input CPU is carried out shaping.
4. a kind of multifunctional microcomputer protective device according to claim 3 is characterized in that, said CT data processing equipment comprises continuous successively:
CT exchanges interface: be used for ac current signal is inserted microcomputer respectively;
CT low voltage transition module: be used for current signal with forceful electric power voltage be converted into CPU can security identification the magnitude of current;
CT analog filter block: be used for the current signal of input CPU is carried out shaping.
5. a kind of multifunctional microcomputer protective device according to claim 4; It is characterized in that said cpu system comprises: microprocessor, the ROM (read-only memory) that links to each other with microprocessor, the RAS that links to each other with microprocessor and the programmable logic processor that links to each other with microprocessor.
6. a kind of multifunctional microcomputer protective device according to claim 5 is characterized in that said input-output system comprises:
8255 interfaces able to programme and PIO interface: be used for expansion interface and apparatus measures parameter and confirm;
Photoelectric isolation module: with isolating exterior measuring-signal and cpu system;
I/O interface: be used to select measurement function;
Display and keyboard: be used to show measurement data and action message and update routine setting valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203741341U CN202285114U (en) | 2011-09-30 | 2011-09-30 | Multifunctional microcomputer protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203741341U CN202285114U (en) | 2011-09-30 | 2011-09-30 | Multifunctional microcomputer protection device |
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| Publication Number | Publication Date |
|---|---|
| CN202285114U true CN202285114U (en) | 2012-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203741341U Expired - Fee Related CN202285114U (en) | 2011-09-30 | 2011-09-30 | Multifunctional microcomputer protection device |
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| CN (1) | CN202285114U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149408A (en) * | 2013-01-29 | 2013-06-12 | 深圳市金博联电力技术有限公司 | Microcomputer protection device and current sampling circuit thereof |
| CN105810037A (en) * | 2016-04-15 | 2016-07-27 | 国网江苏省电力公司盐城供电公司 | Communication simulation type medium-voltage microcomputer comprehensive protection device |
| CN107481599A (en) * | 2017-08-30 | 2017-12-15 | 中铁电气化局集团有限公司 | Microcomputer protecting device simulation system and method |
-
2011
- 2011-09-30 CN CN2011203741341U patent/CN202285114U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149408A (en) * | 2013-01-29 | 2013-06-12 | 深圳市金博联电力技术有限公司 | Microcomputer protection device and current sampling circuit thereof |
| CN103149408B (en) * | 2013-01-29 | 2015-07-01 | 深圳市金博联电力技术有限公司 | Microcomputer protection device and current sampling circuit thereof |
| CN105810037A (en) * | 2016-04-15 | 2016-07-27 | 国网江苏省电力公司盐城供电公司 | Communication simulation type medium-voltage microcomputer comprehensive protection device |
| CN107481599A (en) * | 2017-08-30 | 2017-12-15 | 中铁电气化局集团有限公司 | Microcomputer protecting device simulation system and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 Termination date: 20150930 |
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| EXPY | Termination of patent right or utility model |