CN201365109Y - Relay protection device based on dual-CPU - Google Patents
Relay protection device based on dual-CPU Download PDFInfo
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- CN201365109Y CN201365109Y CNU2009200038681U CN200920003868U CN201365109Y CN 201365109 Y CN201365109 Y CN 201365109Y CN U2009200038681 U CNU2009200038681 U CN U2009200038681U CN 200920003868 U CN200920003868 U CN 200920003868U CN 201365109 Y CN201365109 Y CN 201365109Y
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Abstract
The utility model discloses a relay protection device based on dual-CPU, which utilizes an electric quality sampling chip with high conversion precision to sample electric quality so as to increase precision of electric quality sampling, and utilizes a processing module of a dual-CPU structure to increase processing speed of electric quality sampling data and timeliness of communication, thereby realizing protection and control of the relay better.
Description
Technical field
The utility model relates to the power system relay protection device field, relates in particular to a kind of protective relaying device based on two CPU.
Background technology
Protective relaying device is the important component part of electric power system, is one of important measures of protection safe operation of power system.It is to keep the indispensable part of system's operate as normal in modern electric power system, and its timely action has great significance to the safe operation and the stable of electrical network of power equipment.In the electric power system for some reason as power system oscillation; because electric current and voltage meeting generating period variation during vibration; if at a time voltage is greater than the standard value of relaying protection, and the duration greater than the operate time of relaying protection, then protective relaying device will move.Because present protective relaying device adopts DSP+CPU pattern, single cpu model etc. mostly, thereby makes existing protective relaying device have shortcomings such as certainty of measurement is not high, transfer of data is untimely.
The utility model content
Technical problem to be solved in the utility model is; a kind of protective relaying device based on two CPU is provided; adopt the electric weight sampling A of high conversion accuracy to carry out the electric weight sampling; improved the precision of electric weight sampling; and the processing module of use dual-cpu structure; improve the processing speed of electric weight sampled data, better realize relaying protection and control.
For solving the problems of the technologies described above, the utility model provides a kind of protective relaying device based on two CPU, comprising:
Convert the difference stream signal and the voltage signal of induction to the small voltage signal, and described small voltage signal is carried out the acquisition module that sample conversion becomes digital signal and described digital signal is stored;
Be connected with described acquisition module, the digital signal that is stored in the described acquisition module is handled, and produce the processing module of control signal and control information according to result;
Be connected the relay control module of the on off state of the control signal control relay that produces according to described processing module with described processing module; And
Be connected with described processing module, the control information that receives described processing module output realizes telecommunication and the demonstration communication module that described control information is shown.
Described acquisition module comprises:
The difference stream conversion of signals of induction is become the small current mutual inductor of little current signal;
The voltage signal of induction is converted to the small voltage instrument transformer of little current signal;
Be connected with described small current mutual inductor, be used for the little current signal of described small current mutual inductor conversion is carried out filtering, and convert first filter circuit of corresponding small voltage signal to;
Be connected with described small voltage instrument transformer, be used for the little current signal of described small voltage instrument transformer conversion is carried out filtering, and convert second filter circuit of corresponding small voltage signal to;
The small voltage signal of described first filter circuit and second filter circuit output is carried out sample conversion become digital signal, and the electric weight sampling A that described digital signal is stored.
Described electric weight sampling A has the linearity of the high conversion accuracy of 24bit and 0.1%.
Described processing module comprises: first single-chip microcomputer and second singlechip, adopt ferroelectric memory to carry out communication link, wherein between described first single-chip microcomputer and the described second singlechip
Described first single-chip microcomputer reads the instantaneous value of digital signal in the described acquisition module and calculates the effective value of digital signal according to instantaneous value, and described effective value and operator are compared according to the standard voltage value that application scenarios sets in advance, if described effective value exceeds described standard voltage value, the effective value that then produces control signal and will exceed standard voltage value is that control information writes in the described ferroelectric memory;
Described second singlechip reads the control information in the described ferroelectric memory, and controls described demonstration communication module according to described control information and realize telecommunication and described control information is shown.
Described demonstration communication module comprises: display module and communication module, wherein
The display module that under the control of described second singlechip, described control information is shown;
Under the control of described second singlechip, realize the communication module of telecommunication.
Described display module display resolution is 128 * 64 and embedded second Chinese character base.
The utlity model has following beneficial effect: use the electric weight sampling A of high conversion accuracy, improved the sampling precision of electric quantity data; Use two cpu modes of first single-chip microcomputer and second singlechip, improved the promptness that electric quantity data is handled, and guaranteed that owing to communication link between described first single-chip microcomputer and the second singlechip adopts ferroelectric memory the reliable transmission of data is also low than the cost of the two-port RAM with identical function; The display module of 128 * 64 display resolutions and embedded second Chinese character base can be saved processing time of second singlechip.
Description of drawings
Fig. 1 is the structural representation block diagram based on the protective relaying device of two CPU of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated.
The utility model provides a kind of protective relaying device based on two CPU; adopt high-precision electric weight sampling A to do data acquisition module, improved data sampling precision, and use the processing module of dual-cpu structure; improve processing speed of data, better realize relaying protection and control.
Fig. 1 is the structural representation block diagram based on the protective relaying device of two CPU of the utility model embodiment.As shown in Figure 1, comprising:
Convert the difference stream signal and the voltage signal of induction to the small voltage signal, and described small voltage signal is carried out the acquisition module that sample conversion becomes digital signal and described digital signal is stored;
Be connected with described acquisition module, be used for the digital signal that is stored in described acquisition module is handled, and produce the processing module of control signal and control information according to result;
Be connected with described processing module, be used for the relay control module of the on off state of the control signal control relay that produces according to described processing module;
Be connected with described processing module, be used to receive the control information realization telecommunication of described processing module output and the demonstration communication module that described control information is shown.
In the present embodiment, provide a kind of technical scheme unlike the prior art, used high conversion accuracy electric weight sampling A, improved the sampling precision of data; And the processing module that adopts two cpu modes has improved the ageing of the promptness of data processing and communication.
In the present embodiment, as shown in Figure 1, described acquisition module specifically comprises:
The difference stream conversion of signals of induction is become the small current mutual inductor of little current signal;
The voltage signal of induction is converted to the small voltage instrument transformer of little current signal;
Be connected with described small current mutual inductor, be used for the little current signal of described small current mutual inductor conversion is carried out filtering, and convert first filter circuit of corresponding small voltage signal to;
Be connected with described small voltage instrument transformer, be used for the little current signal of described small voltage instrument transformer conversion is carried out filtering, and convert second filter circuit of corresponding small voltage signal to;
The small voltage signal of described first filter circuit and second filter circuit output is carried out sample conversion become digital signal, and the electric weight sampling A that described digital signal is stored.
Described electric weight sampling A has the linearity of the high conversion accuracy of 24bit and 0.1%.
As shown in Figure 1, described processing module can comprise: first single-chip microcomputer and second singlechip, adopt ferroelectric memory to carry out communication link, wherein between described first single-chip microcomputer and the described second singlechip
Described first single-chip microcomputer reads the instantaneous value of digital signal in the described acquisition module and calculates the effective value of digital signal according to instantaneous value, and described effective value and operator are compared according to the standard voltage value that application scenarios sets in advance, if described effective value exceeds described standard voltage value, the effective value that then produces control signal and will exceed standard voltage value is that control information writes in the described ferroelectric memory;
Described second singlechip reads the control information in the described ferroelectric memory, and controls described demonstration communication module according to described control information and realize telecommunication and described control information is shown.
In the present embodiment, communication link adopts ferroelectric memory as communication buffer between described first singlechip chip and the described second singlechip chip, because having the read-write number of times, ferroelectric memory is close to infinitely, the power down data are not lost, characteristics such as read or write speed is fast can improve the reliable transmission of data in this device.
Described demonstration communication module can comprise:
The display module that under the control of described second singlechip, described control information is shown;
Under the control of described second singlechip, realize the communication module of telecommunication.
Described display module display resolution is 128 * 64 and embedded second Chinese character base.
In the present embodiment, described communication module can provide multiple communication modes such as RS232, RS485 or ethernet communication interface.
In the present embodiment; adopt the CS5460A model of Cirrus Logic company production with described electric weight sampling A; described first single-chip microcomputer and second singlechip can all adopt the single-chip microcomputer of the STC89C58RD+ model of Shenzhen macrocrystalline production; described ferroelectric memory adopts the FM24C16 model; it is example with the chip of the ENC28J60 model of selecting the SPI interface for use that described communication module adopts the ethernet communication mode, and the operation principle of the protective relaying device based on two CPU of the present utility model is carried out following detailed description:
In the prior art, the three-phase voltage in the electrical network, at first every phase voltage is passed through the induction of voltage transformer primary side respectively, and at the open delta place of every loop voltage instrument transformer secondary side output voltage signal, the voltage signal size of output this moment is about 50V; The primary side of two current transformers is responded to the biphase current (generally not comprising earth-current) in the electrical network respectively, with the output of difference stream signal form, size of this difference stream signal is about 10A after the current signal of the secondary side of each current transformer of every loop carries out computing;
This difference stream signal and open delta place output voltage signal pass through small current mutual inductor and the small voltage instrument transformer that the utility model provides respectively then, differing from that wherein small current mutual inductor will be responded to is transferred to first filter circuit after the stream conversion of signals becomes little current signal, first filter circuit carries out little current signal filtering and converts corresponding small voltage signal to, the small voltage instrument transformer is transferred to second filter circuit after converting the voltage signal of responding to little current signal, second filter circuit carries out little current signal filtering and converts corresponding small voltage signal to, the size of small voltage signal specifically can be by the model decision of the electric weight sampling A that is adopted when using at the scene, and the small voltage signal magnitude of first filter circuit and second filter circuit output is about 200mV in the present embodiment;
The small voltage signal of first filter circuit and the output of second filter circuit is exported to the electric weight sampling A that model is CS5460A, by CS5460A the small voltage signal is carried out sample conversion and becomes digital signal, and digital signal is stored;
First single-chip microcomputer reads the instantaneous value that is stored in the digital signal among the CS5460A, and (calculating the method that effective value those skilled in the art can use prior art to provide according to instantaneous voltage realizes to calculate the effective value of digital signal according to the size of instantaneous value, repeat no more in the present embodiment), then described effective value and operator are compared judgement according to the standard voltage value that application scenarios sets in advance, if described effective value exceeds described standard voltage value, the effective value that then produces control signal and will exceed standard voltage value is that control information writes in the ferroelectric memory that model is FM24C16;
Owing to adopt ferroelectric memory to carry out communication link between first single-chip microcomputer and the second singlechip, second singlechip can regularly read the control information among the FM24C16, and according to control information control communication module to select the SPI connecter type for use be ENC28J60 by the ethernet communication mode realize telecommunication and with control information by display resolution be 128 * 64 and the display module of embedded second Chinese character base show, thereby, display module saved the time that the second singlechip processing control information shows because carrying second Chinese character base, make second singlechip can respond other incidents faster, detect task as house dog, the calibration Processing tasks, communication task etc.;
In the present embodiment, the coordination of first single-chip microcomputer and second singlechip is to be finished by interconnection MS-LINK, thereby guarantees that first single-chip microcomputer and second singlechip read/write conflict can not take place.Second singlechip also can be operated accordingly according to operator's button input condition simultaneously, and how it realizes that specifically those skilled in the art can use prior art to finish fully, so do not repeat them here.
In the present embodiment, first single-chip microcomputer and second singlechip all can adopt the Time Triggered multitask mode, and the operator reaches the ms level according to the time that on-the-spot needs will respond the multitask incident, thereby can improve the ageing of whole device.
The above is a preferred implementation of the present utility model; should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also belong to protection range of the present utility model.
Claims (6)
1, a kind of protective relaying device based on two CPU is characterized in that, comprising:
Convert the difference stream signal and the voltage signal of induction to the small voltage signal, and described small voltage signal is carried out the acquisition module that sample conversion becomes digital signal and described digital signal is stored;
Be connected with described acquisition module, the digital signal that is stored in the described acquisition module is handled, and produce the processing module of control signal and control information according to result;
Be connected the relay control module of the on off state of the control signal control relay that produces according to described processing module with described processing module; And
Be connected with described processing module, the control information that receives described processing module output realizes telecommunication and the demonstration communication module that described control information is shown.
2, device according to claim 1 is characterized in that, described acquisition module comprises:
The difference stream conversion of signals of induction is become the small current mutual inductor of little current signal;
The voltage signal of induction is converted to the small voltage instrument transformer of little current signal;
Be connected with described small current mutual inductor, be used for the little current signal of described small current mutual inductor conversion is carried out filtering, and convert first filter circuit of corresponding small voltage signal to;
Be connected with described small voltage instrument transformer, be used for the little current signal of described small voltage instrument transformer conversion is carried out filtering, and convert second filter circuit of corresponding small voltage signal to;
The small voltage signal of described first filter circuit and second filter circuit output is carried out sample conversion become digital signal, and described digital signal is carried out the storing electricity sampling A.
3, device according to claim 2 is characterized in that, described electric weight sampling A has the linearity of the high conversion accuracy of 24bit and 0.1%.
4, device according to claim 1 is characterized in that, described processing module comprises: first single-chip microcomputer and second singlechip, adopt ferroelectric memory to carry out communication link, wherein between described first single-chip microcomputer and the described second singlechip
Described first single-chip microcomputer reads the instantaneous value of digital signal in the described acquisition module and calculates the effective value of digital signal according to instantaneous value, and described effective value and operator are compared according to the standard voltage value that application scenarios sets in advance, if described effective value exceeds described standard voltage value, the effective value that then produces control signal and will exceed standard voltage value is that control information writes in the described ferroelectric memory;
Described second singlechip reads the control information in the described ferroelectric memory, and controls described demonstration communication module according to described control information and realize telecommunication and described control information is shown.
5, device according to claim 4 is characterized in that, described demonstration communication module comprises:
The display module that is connected and under the control of described second singlechip, described control information is shown with second singlechip;
The communication module that is connected and under the control of described second singlechip, realizes telecommunication with second singlechip.
6, device according to claim 5 is characterized in that, described display module display resolution is 128 * 64 and embedded second Chinese character base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200038681U CN201365109Y (en) | 2009-02-16 | 2009-02-16 | Relay protection device based on dual-CPU |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200038681U CN201365109Y (en) | 2009-02-16 | 2009-02-16 | Relay protection device based on dual-CPU |
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| CN201365109Y true CN201365109Y (en) | 2009-12-16 |
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| CNU2009200038681U Expired - Fee Related CN201365109Y (en) | 2009-02-16 | 2009-02-16 | Relay protection device based on dual-CPU |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270126A (en) * | 2014-09-10 | 2015-01-07 | 国家电网公司 | On-off output circuit, control method and monitoring method |
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2009
- 2009-02-16 CN CNU2009200038681U patent/CN201365109Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270126A (en) * | 2014-09-10 | 2015-01-07 | 国家电网公司 | On-off output circuit, control method and monitoring method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091216 Termination date: 20140216 |