CN101938116B - Relay protection method and device - Google Patents
Relay protection method and device Download PDFInfo
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- CN101938116B CN101938116B CN201010283785XA CN201010283785A CN101938116B CN 101938116 B CN101938116 B CN 101938116B CN 201010283785X A CN201010283785X A CN 201010283785XA CN 201010283785 A CN201010283785 A CN 201010283785A CN 101938116 B CN101938116 B CN 101938116B
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Abstract
The embodiment of the invention discloses relay protection method and device. After acquiring a real-time frequency of an AC signal, the relay protection device of the embodiment of the invention screens the real-time frequency in advance; if the real-time frequency is in a preset range, the relay protection device adjusts a first timer and controls an AC sampling frequency according the real-time frequency; and if the real-time frequency is not in the preset range, the relay protection device adjusts a first timer and controls the AC sampling frequency according to a rated frequency of the AC signal. Accordingly, the invention can reliably carry out relay protection to a power system.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of relay protecting method and device.
Background technology
When electric power system is broken down or when other unusual service conditions that jeopardize safe operation take place; Protective relaying device can excise faulty equipment in shortest time in the cards and Minimum Area automatically from system; Or send signal and eliminate the unusual service condition root by the operator on duty, to alleviate or to avoid to the damage of other equipment and the influence that the adjoining area is supplied power.
At present, protective relaying device realizes that the roughly process of its function is described below:
1, monitor the frequency change situation of electric power signal in real time, obtain the real-time frequency of electric power signal, wherein electric power signal can be the electric current AC signal, also can be the voltage AC signal;
2, electric power signal is carried out AC sampling;
In AC sampling, in an AC signal cycle T to input signal fixed sample N time, the time interval T between the double sampling then
sBe T
s=T/N.Because the frequency of practical power systems all can fluctuate within the specific limits; For the small-power electric power system, like the diesel-electric set electric supply system, the signal frequency of its power supply grid will have fluctuation in a big way with the fluctuation of load especially; If the AC signal cycle all calculates according to the rated frequency of electric power system during AC sampling; Then will cause the sampling interval excessive or too small, and cause N point sampling waveform to surpass or cycle of less than, thereby influence the precision of AC sampling.Therefore protective relaying device all will be according to the synchronous sample frequency of the real-time frequency of electric power signal electric power signal being carried out AC sampling when each AC sampling; Be specially: the real-time frequency according to electric power signal is regulated timer; Just regulate the inner period register set point of timer, sampling time interval is counted T
sBe exactly this set point, this timer is that initial value carries out orientation and subtracts counting with the period register set point, when counting down to 0, produces AC sampling of down trigger;
3, the data that obtain through AC sampling are analyzed, judged whether and to carry out relaying protection to electric power system;
4, when needs carry out relaying protection to electric power system, accomplish various safeguard measures through the configuration relay, for example outlet tripping operation, signal alarm etc.
There is several different methods can obtain the real-time frequency of electric power signal in the prior art; For example, protective relaying device generally need be to a lot of roads of power system measuring of ac, with one road curtage loop as the frequency measurement loop; Is square-wave signal through amplifying circuit with the ac sine conversion of signals in this frequency measurement loop; With frequency multiplier circuit square-wave signal is become double frequency pulse then, through double frequency pulse counting being drawn the real-time frequency of electric power signal, or the like.
Inventor of the present invention finds that in to the research of above-mentioned prior art and practice process whether reliably can the real-time frequency that monitor electric power signal accurately be decision protective relaying device key factor.When the real-time frequency of electric power signal during in fact in the generation big ups and downs; For example when very serious fault or system take place and can't operate fully in electric power system; Therefore the real-time frequency that various methodologies obtained through prior art all is inaccurate, and protective relaying device can not accurately be judged electric power system and breaks down or unusual service condition is arranged in this case.
Summary of the invention
The embodiment of the invention provides a kind of relay protecting method and device, can carry out relaying protection to electric power system reliably.
A kind of relay protecting method comprises: the real-time frequency of obtaining AC signal; Judge that said real-time frequency is whether in presetting range; If not, then regulate first timer, carry out AC sampling according to the rated frequency of said AC signal; Said first timer is used for when AC sampling, producing sampling to interrupt; If, then regulate said first timer according to said real-time frequency, carry out AC sampling; Result according to said AC sampling analyzes, and said analysis result is used to judge whether and need carries out relaying protection to electric power system; When needs carry out relaying protection to electric power system, relaying protection is carried out in electric power system through the make-break operation of control relay.
A kind of protective relaying device comprises: acquiring unit is used to obtain the real-time frequency of AC signal; The AC sampling unit is used to judge that said real-time frequency is whether in presetting range, if not; Then regulate first timer according to the rated frequency of said AC signal; Carry out AC sampling, said first timer is used for when AC sampling, producing sampling to interrupt, if; Then regulate said first timer, carry out AC sampling according to said real-time frequency; Processing unit is used for analyzing according to the result of said AC sampling, and said analysis result is used to judge whether and need carries out relaying protection to electric power system; The relaying protection unit is used for when needs carry out relaying protection to electric power system, through the make-break operation of control relay relaying protection being carried out in electric power system.
Can find out that from above technical scheme the embodiment of the invention has the following advantages:
Protective relaying device is after the real-time frequency of the AC signal that obtains electric power system; In advance this real-time frequency is screened; If this real-time frequency is in the scope that presets; Protective relaying device is then regulated first timer according to this real-time frequency, and the frequency of control AC sampling has guaranteed that protective relaying device can judge accurately whether electric power system is broken down or unusual service condition is arranged; If this real-time frequency is not in the scope that presets; Protective relaying device is then regulated first timer according to the rated frequency of AC signal so, can judge accurately that equally also whether electric power system is broken down or unusual service condition arranged, and therefore can carry out relaying protection to electric power system reliably.
Description of drawings
Fig. 1 is the schematic flow sheet of the embodiment one of relay protecting method in the embodiment of the invention;
Fig. 2 is the schematic flow sheet of the embodiment two of relay protecting method in the embodiment of the invention;
Fig. 3 is the logical construction sketch map of the embodiment three of protective relaying device in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of relay protecting method, and the embodiment of the invention also provides corresponding protective relaying device, below is elaborated respectively.
Embodiment one, the embodiment of the invention provide an embodiment of relay protecting method, and its flow process is as shown in Figure 1, comprising:
101, obtain the real-time frequency of AC signal;
Electric power system is in the running of reality, and the real-time frequency of AC signal is constantly to change in the system, can not be always be consistent with its rated frequency.
The method of obtaining real-time frequency specifically can for: in the process of relaying protection; Protective relaying device generally need be measured a lot of roads AC signal; Can therefrom select one road voltage or current circuit as the frequency measurement loop; Change the AC signal in frequency measurement loop into square-wave signal through amplifying circuit, through second timer square-wave signal is counted again, just can draw the real-time frequency of AC signal according to count value.
102, judge real-time frequency whether in presetting range, if not, then execution in step 103., if then execution in step 104;
Because the real-time frequency through the AC signal that step 101 obtained not is the accuracy that under any circumstance can both guarantee it; Present embodiment is provided with a presetting range to these through the real-time frequency that step 101 obtained; Screen the real-time frequency that conforms to the actual frequency of AC signal with this presetting range; The real-time frequency that only meets this presetting range just can be used to regulate first timer, carries out AC sampling, when having surpassed this presetting range; Protective relaying device just adopts the rated frequency of AC signal to regulate first timer, carries out AC sampling.In the present embodiment, first timer is to be used for when AC sampling producing sampling to interrupt, and protective relaying device to carry out the concrete implementation method of AC sampling identical with prior art through regulating first timer, repeat no more here.
Be provided with presetting range specifically can for: for example the rated frequency of AC signal is 50 hertz; Because big ups and downs when not taking place in the actual frequency of prevision AC signal; Promptly remove nonsystematic very serious fault or system crash have taken place; This actual frequency can not exceed 45 hertz～55 hertz, and therefore presetting range can be set is 45 hertz～55 hertz.
103, carry out AC sampling according to rated frequency;
The real-time frequency that obtains through step 101 when protective relaying device is not in presetting range; For example, the rated frequency of AC signal is 50 hertz as previously mentioned, and setting presetting range is 45 hertz～55 hertz; And the real-time frequency that obtains through step 101 is 80 hertz; Can reach a conclusion so: this real-time frequency that obtains through step 101 is when the actual frequency generation big ups and downs of AC signal, to obtain, and is not inconsistent with actual frequency, at this moment; Protective relaying device is regulated first timer according to the rated frequency of AC signal, carries out AC sampling.
104, carry out AC sampling according to real-time frequency;
The real-time frequency that obtains through step 101 when protective relaying device is not in presetting range; For example, the rated frequency of AC signal is 50 hertz as previously mentioned, and setting presetting range is 45 hertz～55 hertz; The real-time frequency that obtains through step 101 is 40 hertz; Can reach a conclusion so: this is when the actual frequency of AC signal big ups and downs takes place, not obtain through the real-time frequency that step 101 obtains, and conforms to actual frequency, at this moment; Protective relaying device is regulated first timer according to the real-time frequency that is obtained, and carries out AC sampling.
105, need to judge whether relaying protection, if then execution in step 106, if not, then execution in step 107;
Protective relaying device is analyzed according to the result of AC sampling, and the result of this analysis is used to judge whether and need carries out relaying protection to electric power system.For example protective relaying device can judge that whether maximum phase current is greater than current ration according to the result of AC sampling during overcurrent protection; If maximum phase current surpasses the action delay time greater than the duration of current ration, protective relaying device draws the result of judgement for taking the relaying protection action.
106, through relay electric power system is protected;
When needs carried out relaying protection to electric power system, protective relaying device can be through outlet configuration, and the corresponding relays of setting is moved, for example, and outlet tripping operation or send signal such as warning to the scene.
107, keep the electric power system current state.
In the time need not carrying out relaying protection to electric power system, protective relaying device is kept the electric power system current state with regard to not carrying out any action.
In the present embodiment; Protective relaying device is after the real-time frequency of the AC signal that obtains electric power system; In advance this real-time frequency is screened, if this real-time frequency in the scope that presets, protective relaying device is then regulated first timer according to this real-time frequency; The frequency of control AC sampling; Guaranteed protective relaying device can judge accurately whether electric power system is broken down or unusual service condition is arranged, if this real-time frequency not in the scope that presets, protective relaying device is then regulated first timer according to the rated frequency of AC signal so; Can judge accurately that equally also whether electric power system is broken down or unusual service condition arranged, and therefore can carry out relaying protection to electric power system reliably.
When the actual frequency of the AC signal of electric power system in fact when big ups and downs take place; The real-time frequency that protective relaying device obtained is inaccurate, therefore in embodiment one, through dividing presetting range; Select actual frequency at AC signal the real-time frequency that obtained under the situation of big ups and downs does not take place; The real-time frequency that only meets this scope could be as the frequency of protective relaying device AC sampling, still, when the amplitude of AC signal hour; The real-time frequency that protective relaying device obtained in this case also is inaccurate, thus the relay protecting method that protective relaying device adopted further can also for:
Embodiment two, the embodiment of the invention provide another embodiment of relay protecting method, and its flow process is as shown in Figure 2, comprising:
201, the step 101 with embodiment one as shown in Figure 1 is identical, repeats no more here;
202, judge real-time frequency whether in presetting range, if not, then execution in step 203., if then execution in step 204;
Protective relaying device is judged the real-time frequency of the AC signal that obtains through step 201, and the process in presetting range is identical with embodiment one as shown in Figure 1; But in the present embodiment; Different according to performed successor operation of judged result protective relaying device and embodiment one as shown in Figure 1, concrete is:
When real-time frequency that protective relaying device obtained in presetting range; Protective relaying device will judge that also whether the amplitude of AC signal surpasses the preset gate limit value, if not, then regulates first timer according to the rated frequency of AC signal; If just regulate first timer according to real-time frequency.
203, the step 103 with embodiment one as shown in Figure 1 is identical, repeats no more here;
Whether the amplitude of 204, judging AC signal is above the preset gate limit value, and if not, then execution in step 203, if, execution in step 205.
Protective relaying device obtain AC signal amplitude mode specifically can for: adopt analog to digital converter to carry out AC sampling, the sampled value that obtains in the cycle calculated the amplitude of AC signal according to the rated frequency of AC signal.
Be provided with the preset gate limit value specifically can for: for example when AC signal was the electric current AC signal, the preset gate limit value was 0.06In, when AC signal is the voltage AC signal; The preset gate limit value is 0.1Un; Wherein, In is the load current value of current circuit, and Un is the load voltage value of voltage circuit.
205～208, identical with step 104～107 of embodiment one as shown in Figure 1, repeat no more here.
In the present embodiment; Protective relaying device further screens the real-time frequency that protective relaying device obtains through the preset gate limit value of setting the AC signal amplitude; The real-time frequency that further guarantees to be used for to regulate first timer conforms to the actual frequency of AC signal, thereby can carry out relaying protection to electric power system more reliably.
Embodiment three, the embodiment of the invention provide an embodiment of protective relaying device, and its structure is as shown in Figure 3, comprising:
Further, in the present embodiment, AC sampling unit 302 also is used for, the real-time frequency of judging the AC signal obtained be in presetting range after, before regulating first timer, obtain the amplitude of AC signal according to real-time frequency; Judge whether this amplitude surpasses the preset gate limit value, if, then carry out the step of regulating first timer according to real-time frequency, if not, then regulate first timer according to the rated frequency of AC signal.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than a kind of relay protecting method provided by the present invention and device have been carried out detailed introduction; For one of ordinary skill in the art; Thought according to the embodiment of the invention; The part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. a relay protecting method is characterized in that, comprising:
Obtain the real-time frequency of AC signal;
Judge that said real-time frequency is whether in presetting range; If not, then regulate first timer, carry out AC sampling according to the rated frequency of said AC signal; Said first timer is used for when AC sampling, producing sampling to interrupt; If, then regulate said first timer according to said real-time frequency, carry out AC sampling;
Result according to said AC sampling analyzes, and analysis result is used to judge whether and need carries out relaying protection to electric power system;
When needs carry out relaying protection to electric power system, relaying protection is carried out in electric power system through the make-break operation of control relay;
Wherein, the real-time frequency of judging the AC signal obtained be in presetting range after, before regulating first timer, also comprise step according to real-time frequency:
Obtain the amplitude of said AC signal;
Judge whether said amplitude surpasses the preset gate limit value, if, then carry out said step of regulating first timer according to real-time frequency, if not, then regulate first timer according to the rated frequency of said AC signal.
2. method according to claim 1 is characterized in that,
The amplitude of obtaining said AC signal specifically adopts: adopt analog to digital converter to carry out AC sampling according to said rated frequency, the sampled value that obtains in the cycle is calculated the amplitude of said AC signal.
3. method according to claim 1 and 2 is characterized in that, the real-time frequency of obtaining said AC signal is specially:
Change said AC signal into square-wave signal through amplifying circuit;
Adopt second timer that said square-wave signal is counted, obtain the real-time frequency of said AC signal according to count value.
4. a protective relaying device is characterized in that, comprising:
Acquiring unit is used to obtain the real-time frequency of AC signal;
The AC sampling unit is used to judge that said real-time frequency is whether in presetting range, if not; Then regulate first timer according to the rated frequency of said AC signal; Carry out AC sampling, said first timer is used for when AC sampling, producing sampling to interrupt, if; Then regulate said first timer, carry out AC sampling according to said real-time frequency;
Processing unit is used for analyzing according to the result of said AC sampling, and analysis result is used to judge whether and need carries out relaying protection to electric power system;
The relaying protection unit is used for when needs carry out relaying protection to electric power system, through the make-break operation of control relay relaying protection being carried out in electric power system;
Wherein, the AC sampling unit also is used for, the real-time frequency of judging the AC signal obtained be in presetting range after, before regulating first timer, obtain the amplitude of said AC signal according to real-time frequency; Judge whether said amplitude surpasses the preset gate limit value, if, then carry out said step of regulating first timer according to real-time frequency, if not, then regulate first timer according to the rated frequency of said AC signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010283785XA CN101938116B (en) | 2010-09-14 | 2010-09-14 | Relay protection method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010283785XA CN101938116B (en) | 2010-09-14 | 2010-09-14 | Relay protection method and device |
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| CN101938116A CN101938116A (en) | 2011-01-05 |
| CN101938116B true CN101938116B (en) | 2012-11-21 |
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| CN201010283785XA Expired - Fee Related CN101938116B (en) | 2010-09-14 | 2010-09-14 | Relay protection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104682359A (en) * | 2014-12-25 | 2015-06-03 | 国家电网公司 | Relay protection method of power supply line |
| CN104931837A (en) * | 2015-06-30 | 2015-09-23 | 安徽博诺思信息科技有限公司 | Relay protection simulation debugging system based on mobile terminal |
| CN105759104B (en) * | 2016-04-22 | 2018-09-07 | 浙江科能达电气有限公司 | Intelligent controller and control method of multi-frequency sampling |
| CN111766464B (en) * | 2020-06-17 | 2023-09-05 | 积成电子股份有限公司 | Automatic testing method and system for fixed value compliance of relay protection device of transformer substation |
Citations (3)
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| RU2176429C1 (en) * | 2000-11-27 | 2001-11-27 | Шинкаренко Сергей Михайлович | Method of differential protection of bus bars of lowest level of voltage in electric installation and gear for its realization |
| CN2919261Y (en) * | 2006-03-15 | 2007-07-04 | 宋益群 | AC current and voltage measuring circuit adopting AC sampling |
| CN101826707A (en) * | 2009-03-02 | 2010-09-08 | 丁建新 | Intelligent prefabricated substation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09284997A (en) * | 1996-04-16 | 1997-10-31 | Matsushita Seiko Co Ltd | Relay protection device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2176429C1 (en) * | 2000-11-27 | 2001-11-27 | Шинкаренко Сергей Михайлович | Method of differential protection of bus bars of lowest level of voltage in electric installation and gear for its realization |
| CN2919261Y (en) * | 2006-03-15 | 2007-07-04 | 宋益群 | AC current and voltage measuring circuit adopting AC sampling |
| CN101826707A (en) * | 2009-03-02 | 2010-09-08 | 丁建新 | Intelligent prefabricated substation |
Non-Patent Citations (1)
| Title |
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| 郑玉森，张炳达，宵燕彩.水轮机微机调速***中人工频率死区控制.《大电机技术》.1996,(第2期),53－54. * |
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Address after: 518057 Nanshan District high tech Industrial Village, Guangdong, R2,, B5 Patentee after: Farad Electric Co., Ltd. Address before: 5, building B, block 518057, building R2, hi tech Industrial Village, Guangdong, Shenzhen Patentee before: Shenzhen Hualite Electric Appliances Co., Ltd. |
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Granted publication date: 20121121 Termination date: 20200914 |