CN101350511A - Twofold startup method protected by microcomputer protecting equipment - Google Patents
Twofold startup method protected by microcomputer protecting equipment Download PDFInfo
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- CN101350511A CN101350511A CNA2008100460527A CN200810046052A CN101350511A CN 101350511 A CN101350511 A CN 101350511A CN A2008100460527 A CNA2008100460527 A CN A2008100460527A CN 200810046052 A CN200810046052 A CN 200810046052A CN 101350511 A CN101350511 A CN 101350511A
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Abstract
The invention discloses a microwave oven protection device and a dual startup method. The method includes the procedures of current increment measurement during each sampling period, current increment comparison, counter operation, Fourier transformation and CPU output, etc. The invention combines the traditional threshold startup method and the newly added increment startup method, i.e. the threshold startup method is adopted for backup protection and the increment method is adopted for main protection and other protection types, thereby, the CPU occupation rate is reasonably arranged, the work efficiency of the CPU is improved, and the requirement of different startup types of the microcomputer is satisfied; in addition, the invention adopts two protection startup modes, thereby, the system tasks can be rationally allocated, the system load can be alleviated, and the speed, flexibility and reliability of protection is also improved.
Description
Technical field
The present invention relates to electric power system Microcomputer Protection field, specifically be meant a kind of twofold startup method of protected by microcomputer protecting equipment.
Background technology
Microcomputer protecting device is a kind of protective relaying device that utilizes microprocessor to constitute; because it has characteristics such as high reliability, high selectivity, high sensitivity and information-based program height, microcomputer protecting device has obtained utilization widely on relay protection of power system.
At present, function such as all rapidity that microcomputer protecting device possessed, high sensitivity all is that Starting mode by protected by microcomputer protecting equipment realizes.The Starting mode of traditional protected by microcomputer protecting equipment all is single employing threshold value Starting mode, because what the threshold value Starting mode adopted is regularly the mode of inquiry, therefore need constantly carry out the inquiry of various information, thereby caused threshold value to start the running time that protected mode can take a large amount of CPU, make the protection sensitivity of microcomputer protecting device be affected, particularly the sensitivity of differential protection can not further improve again, and its rapidity and reliability also are difficult to guarantee; Simultaneously; along with developing by leaps and bounds of computer technology and semiconductor technology; the function of microcomputer protecting device also from strength to strength; the level of informatization is also more and more higher; its application also expands to terminal uses such as factories and miness, enterprise, commerce, army rapidly by single professional power consumer; therefore under user's the high level of informatization and highly sensitive requirement, protection selectivity, sensitivity and the reliability of traditional microcomputer protecting device all can not satisfy user's high demand.Therefore, the protection Starting mode of traditional microcomputer protecting device can not satisfy user's demand, and is imperative to the improvement of the protection Starting mode of microcomputer protecting device.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art; a kind of twofold startup method of protected by microcomputer protecting equipment is provided; this twofold startup method not only can reasonably be arranged the occupancy of CPU; reduce the stand-by period; and can also the reasonable distribution system task, improve sensitivity, rapidity and the reliability of system.
Purpose of the present invention is achieved through the following technical solutions: a kind of twofold startup method of protected by microcomputer protecting equipment may further comprise the steps:
(1) CPU detects the current increment Δ E of each phase current respectively in each sampling period, and each mutually detected current increment Δ E is compared with the electric current preset value E that sets in advance in CPU respectively;
(2) if any phase current increment Delta E during more than or equal to electric current preset value E, then increment counter adds 1; If when not having current increment Δ E more than or equal to electric current preset value E, then increment counter zero clearing;
(3) judge whether to surpass the number of times judgment value N that is set in advance among the CPU according to the numerical value in the increment counter, if the numerical value in the increment counter is during more than or equal to number of times judgment value N, then incremental detection mark set, and revise the protection judgement time that starts the protection determining program simultaneously; If the numerical value in the increment counter during less than number of times judgment value N, then returns step (1) and detects again, simultaneously the increment counter zero clearing;
(4) CPU carries out Fourier transform with the analog quantity that every phase collected, and calculates the first-harmonic effective value of every phase simultaneously, and first-harmonic effective value that calculates and the setting value that is set in advance among the CPU are compared; If this first-harmonic effective value is during less than setting value, the zero clearing of protection delay counter is if this first-harmonic effective value during more than or equal to setting value, judges then whether protection action outlet time-delay counting arrives the time-delay definite value that sets;
(5) if this protection action outlet time-delay counting reaches the time-delay definite value that sets, then CPU starts tripping operation, and the operation of posting a letter; If this protection action outlet time-delay counting does not reach the time-delay definite value that sets, then return step (5) and continue to judge whether this protection action outlet time-delay counting reaches the time-delay definite value that sets.
Further, the value of the electric current preset value E in the step (1) is 1A.
Current increment Δ E in described step (1) and the step (2) is the ratio of electric current that is collected in this sampling period and the electric current that was collected in the last sampling period.The value of number of times judgment value N in the described step (3) is 3.
The present invention compared with prior art has following advantage and beneficial effect:
(1) the present invention adopts traditional threshold value startup method to combine with the increment startup method that increases newly, promptly can adopt threshold value startup method at backup protection, then adopt increment startup method at other protection types such as main protections, thereby can reasonably arrange the occupancy of CPU, improve the operating efficiency of CPU, satisfy the startup requirement of the difference protection type of microcomputer protecting device;
(2) the present invention adopts two kinds of protection Starting mode, and reasonably the distribution system task has alleviated system burden, and can also increase rapidity, sensitivity and the reliability of protection.
Description of drawings
Fig. 1 is a flow chart of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment
The present invention has increased a kind of protection increment startup method newly on traditional threshold value startup method that microcomputer protecting device adopted.The present invention is directed to the different startup method that different Microcomputer Protection types can be chosen automatically, thus the occupancy of reasonably arranging CPU, the operating efficiency of raising CPU.
As shown in Figure 1, the present invention realizes by following steps: at first CPU detects the current increment Δ E of each phase current respectively in each sampling period.Described this current increment is the ratio of electric current that is collected in this sampling period and the electric current that was collected in the last sampling period.After collecting the current increment Δ E of each phase current, CPU compares each mutually detected current increment Δ E respectively with the electric current preset value E that sets in advance in CPU.This electric current preset value E can be the scope of a broad, promptly can be selected according to the situation of reality.In order to realize the present invention, the value of this electric current value of pre-seting E is 1A.
If any phase current increment Delta E is during more than or equal to electric current preset value E, then increment counter adds 1; If when not having current increment Δ E more than or equal to electric current preset value E, then increment counter zero clearing when this sampling period finishes.
CPU judges whether to surpass the number of times judgment value N that is set in advance among the CPU according to the numerical value in the increment counter.If the numerical value in the increment counter is during more than or equal to number of times judgment value N, then incremental detection mark set, and revise the protection judgement time that starts the protection determining program simultaneously, promptly shorten this protection judgement time accordingly, thereby accelerate the protection judgement; If the numerical value in the increment counter during less than number of times judgment value N, then detects current increment Δ E again, and whether the current increment of judging any phase more than or equal to the electric current value of pre-seting E, while increment counter zero clearing.Usually, the value of this number of times judgment value N is also decided according to the situation of reality, but in order better to realize the present invention, the number of times judgment value N value in the present embodiment is 3.
CPU carries out Fourier transform with the analog quantity that every phase collected, and calculates the first-harmonic effective value of every phase simultaneously, and first-harmonic effective value that calculates and the setting value that is set in advance among the CPU are compared; If this first-harmonic effective value is during less than setting value, the zero clearing of protection delay counter is if this first-harmonic effective value during more than or equal to setting value, judges then whether protection action outlet time-delay counting arrives the time-delay definite value that sets.
If this protection action outlet time-delay counting reaches the time-delay definite value that sets, then CPU starts tripping operation, and the operation of posting a letter; If this protection action outlet time-delay counting does not reach the time-delay definite value that sets, continue then to judge whether this protection action outlet time-delay counting reaches the time-delay definite value that sets.
As mentioned above, just can realize the present invention preferably.
Claims (4)
1, a kind of twofold startup method of protected by microcomputer protecting equipment is characterized in that, may further comprise the steps:
(1) CPU detects the current increment Δ E of each phase current respectively in each sampling period, and each mutually detected current increment Δ E is compared with the electric current preset value E that sets in advance in CPU respectively;
(2) if any phase current increment Delta E during more than or equal to electric current preset value E, then increment counter adds 1; If when not having current increment Δ E more than or equal to electric current preset value E, then increment counter zero clearing;
(3) judge whether to surpass the number of times judgment value N that is set in advance among the CPU according to the numerical value in the increment counter, if the numerical value in the increment counter is during more than or equal to number of times judgment value N, then incremental detection mark set, and revise the protection judgement time that starts the protection determining program simultaneously; If the numerical value in the increment counter during less than number of times judgment value N, then returns step (1) and detects again, simultaneously the increment counter zero clearing;
(4) CPU carries out Fourier transform with the analog quantity that every phase collected, and calculates the first-harmonic effective value of every phase simultaneously, and first-harmonic effective value that calculates and the setting value that is set in advance among the CPU are compared; If this first-harmonic effective value is during less than setting value, the zero clearing of protection delay counter is if this first-harmonic effective value during more than or equal to setting value, judges then whether protection action outlet time-delay counting arrives the time-delay definite value that sets;
(5) if this protection action outlet time-delay counting reaches the time-delay definite value that sets, then CPU starts tripping operation, and the operation of posting a letter; If this protection action outlet time-delay counting does not reach the time-delay definite value that sets, then return step (5) and continue to judge whether this protection action outlet time-delay counting reaches the time-delay definite value that sets.
2, the twofold startup method of a kind of protected by microcomputer protecting equipment according to claim 1 is characterized in that, the value of the electric current preset value E in the described step (1) is 1A.
3, the twofold startup method of a kind of protected by microcomputer protecting equipment according to claim 1; it is characterized in that the current increment Δ E in described step (1) and the step (2) is the ratio of electric current that is collected in this sampling period and the electric current that was collected in the last sampling period.
4, the twofold startup method of a kind of protected by microcomputer protecting equipment according to claim 1 is characterized in that, the value of the number of times judgment value N in the described step (3) is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100460527A CN101350511B (en) | 2008-09-16 | 2008-09-16 | Twofold startup method protected by microcomputer protecting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100460527A CN101350511B (en) | 2008-09-16 | 2008-09-16 | Twofold startup method protected by microcomputer protecting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101350511A true CN101350511A (en) | 2009-01-21 |
| CN101350511B CN101350511B (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100460527A Expired - Fee Related CN101350511B (en) | 2008-09-16 | 2008-09-16 | Twofold startup method protected by microcomputer protecting equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374887A (en) * | 2019-07-15 | 2019-10-25 | 东北大学 | A kind of overloading automatic protection control method of pump variable frequency device |
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2008
- 2008-09-16 CN CN2008100460527A patent/CN101350511B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374887A (en) * | 2019-07-15 | 2019-10-25 | 东北大学 | A kind of overloading automatic protection control method of pump variable frequency device |
| CN110374887B (en) * | 2019-07-15 | 2020-05-12 | 东北大学 | Automatic overload protection control method for water pump frequency converter |
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| Publication number | Publication date |
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| CN101350511B (en) | 2011-03-23 |
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Granted publication date: 20110323 Termination date: 20200916 |