CN101256206A - Method for measuring and recording mutation current of neutral point earthing resistor - Google Patents
Method for measuring and recording mutation current of neutral point earthing resistor Download PDFInfo
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- CN101256206A CN101256206A CNA200710037707XA CN200710037707A CN101256206A CN 101256206 A CN101256206 A CN 101256206A CN A200710037707X A CNA200710037707X A CN A200710037707XA CN 200710037707 A CN200710037707 A CN 200710037707A CN 101256206 A CN101256206 A CN 101256206A
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Abstract
The invention provides a measuring and recording method of neutral resistance mutation circuit, using computer management system to process the current and voltage obtained by the neutral resistance mutation circuit measuring and recording device, comprising initializing, sampling and filtering, taking the maximum value of current and judging whether the maximum value exceeds the limit or not, sampling the voltage and calibrating, storing normal data, judging whether there is signal or not at the communication port, continuously sampling the current, judging whether the maximum value exceeds the limit or not, judging whether it is timeout or not, storing recording data, judging whether it is necessary to alarm or not. The said method can sample the current flowing through the neutral resistance to provide statistical data to judge whether the ground resistance works at safe state or not, and additionally measure and record the neutral voltage, on one hand, the data is stored and on the other hand the alarm signal is sent in time to remove the trouble.
Description
Technical field
The present invention relates to a kind of electric current method for measuring and recording, relate in particular to a kind of neutral resistance method for measuring and recording mutation current.
Technical background
In electric system, earthing mode mainly contains resistance eutral grounding, resonance grounding and earth-free these several earthing modes.Along with improving constantly of cable rate in the electrical network, system capacitive current increases gradually, and resistance earthing has obtained application more and more widely.The resistance quantity that neutral ground is used also increases thereupon, and operating mode how to control stake resistance becomes the problem that needs are paid attention to.
Along with the using and updating of stake resistance, to electric resistance of stainless, arrive combined type resistance cabinet from cast iron resistance again, but do not obtain paying attention to always for the operating mode control of stake resistance.Because stake resistance has only when single-phase earthing occurring in the electrical network at the normal system voltage that do not bear in service, just bears system voltage.Therefore it is generally acknowledged that stake resistance itself does not need to protect or monitor.The neutral resistance fault flows through the electric current of neutral resistance except quality of resistance own and structure problem, be the factor that the stake resistance operating mode is had the greatest impact.
Because the ground protection setting time in the system all was controlled in 4.5 seconds, the thermally-stabilised accounting of stake resistance is generally according to 10 seconds 1000 peaces.Stake resistance relevant criterion and type approval test at present all set up on this basis.Usually do not consider that ground current for a long time by stake resistance, not take monitoring measure at this situation.
It has been generally acknowledged that single-phase earthing in resistance grounded system, can start zero-sequence current or zero-sequence voltage protection, thereby therefore the excision fault can not exert an influence to stake resistance.But in actual conditions, because various situations may cause the ground connection of intermittent ground connection and big resistance transition resistance, for example the insulated conductor broken string causes intermittent ground connection easily, and cable splice ground connection in worker's well causes big resistance transition resistance ground connection easily.For big resistance transition resistance ground connection, because reaching, fault current numerical value protects the requirement of adjusting, may cause to protect and be failure to actuate; For intermittent ground connection, because twice clearance gap time is shorter, be not enough to start protection, also can cause to protect and be failure to actuate.These two kinds of earth faults all might cause neutral resistance for a long time by electric current, so that shorten the operation life of stake resistance, even produce the stake resistance fault.The stake resistance fault of Chan Shenging is huge for the influence of system in this case.Because in this case; protection action and signal alarm do not have only when fault further develops just to start protection action or signal alarm, and promptly might there be fault for a long time in system; and then the expansion fault, can cause tremendous influence to total system.
Summary of the invention
The objective of the invention is provides a kind of neutral resistance method for measuring and recording mutation current for overcoming above shortcoming, can sample to the electric current that flows through neutral resistance, provide statistics for whether stake resistance is operated in safe condition, and auxiliary survey of voltage to neutral recorded, store the data of data on the one hand, can in time send alerting signal on the other hand to fix a breakdown.
The technical scheme that realizes above-mentioned purpose is: a kind of neutral resistance method for measuring and recording mutation current, and adopt computer management system to handle electric current and the voltage that obtains from the neutral resistance instrument for measuring and recording mutation current, the step of its method comprises:
Step 1: initialization;
Step 2: the electric current of neutral resistance is sampled and filtering;
Step 3: power taking stream maximal value, promptly get the current value of the filtered maximum that obtains;
Step 4: judging whether transfinites, i.e. whether the data that sampling obtains surpass the limit value that is provided with in advance:
If the current maxima of promptly getting transfinites, then enter step 5;
If not, the current maxima of promptly getting does not transfinite, and then order enters step 41,42 and 43;
Step 41: to voltage sample and calibration;
Step 42: deposit normal data;
Step 43: judge whether communication port has signal:
If promptly communication port has signal, then enter step 44, return step 2 then;
Step 44: carry out communication;
If not, then return step 2;
Step 5: electric current is carried out continuous sampling;
Step 6: judge whether maximal value transfinites:
If not, then order enters step 7 and 8;
If then enter step 61;
Step 61: judge whether overtime:
If then enter step 62;
If not, then return step 5;
Step 62: the put data enter step 9 then;
Step 7: put data;
Step 8: need to judge whether to report to the police:
If, promptly need to report to the police, then enter step 9;
If not, promptly do not need to report to the police, then return step 41;
Step 9: report to the police.
Above-mentioned a kind of neutral resistance method for measuring and recording mutation current wherein, is filtered into digital filtering in the described step 2.
Above-mentioned a kind of neutral resistance method for measuring and recording mutation current, wherein, described step 1 initialization comprises the running status of automatic gauging each several part hardware, the time of start-of-record operation, import the parameter of various settings and correction, the storer zero clearing that needs are used.
Above-mentioned a kind of neutral resistance method for measuring and recording mutation current, wherein, described step 42 is deposited normal data in the normal data and is comprised transfinite the number of minutes, the voltage effective value of value the transfinite time of the number of minutes of value, maximum current effective value and generation, maximum voltage effective value and the time of generation, maximum current instantaneous value and the time of generation and the tripping operation number of times of generation of current effective value every day.
Above-mentioned a kind of neutral resistance method for measuring and recording mutation current, wherein, described step 7 put data comprise that the put instrument powers on and dead electricity time last time, trip time and tripping operation before electric current and voltage value, closing time and close a floodgate after the logout of electric current and voltage value.
Above-mentioned a kind of neutral resistance method for measuring and recording mutation current, wherein, described step 62 put data comprise that the put instrument powers on and dead electricity time last time, trip time and tripping operation before electric current and voltage value, closing time and close a floodgate after the logout of electric current and voltage value.
The invention has the beneficial effects as follows: a kind of neutral resistance method for measuring and recording mutation current of the present invention carries out high-speed sampling to the electric current of the neutral resistance of flowing through, provide statistics for whether stake resistance is operated in safe condition, and the auxiliary survey of passing through voltage to neutral is recorded, obtain the neutral point voltage value when undergoing mutation electric current, to analyze the impact failure degree that stake resistance is subjected to mutation current, after detecting mutation current, according to the peaked size of electric current and the length of duration, the data of record are surveyed in storage on the one hand, in addition in the case of necessary, send alerting signal in time to fix a breakdown, the analysis data that the data of recording can be used as the maintenance and the replacing of stake resistance are surveyed in storage.
Description of drawings
Fig. 1 is the process flow diagram of a kind of neutral resistance method for measuring and recording mutation current of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, process flow diagram for a kind of neutral resistance method for measuring and recording mutation current of the present invention, it adopts computer management system to handle electric current and the voltage that obtains from neutral resistance instrument for measuring and recording mutation current (not shown), and the step of its method comprises:
Step 1: initialization, this step comprises the running status of automatic gauging each several part hardware, the time of start-of-record operation, imports the parameter of various settings and correction, the storer zero clearing that needs are used;
Step 2: the electric current of neutral resistance is sampled and filtering, is digital filtering among the present invention;
Step 3: power taking stream maximal value, promptly get the current value of the filtered maximum that obtains;
Step 4: judging whether transfinites, i.e. whether the data that sampling obtains surpass the limit value that is provided with in advance:
If the current maxima of promptly getting transfinites, then enter step 5;
If not, the current maxima of promptly getting does not transfinite, and then order enters step 41,42 and 43;
Step 41: to voltage sample and calibration;
Step 42: deposit normal data, this normal data comprises transfinite the number of minutes, the voltage effective value of value the transfinite time of the number of minutes of value, maximum current effective value and generation, maximum voltage effective value and the time of generation, maximum current instantaneous value and the time of generation and the tripping operation number of times of generation of current effective value every day;
Step 43: judge whether communication port has signal:
If promptly communication port has signal, then enter step 44, return step 2 then;
Step 44: carry out communication;
If not, then return step 2;
Step 5: electric current is carried out continuous sampling;
Step 6: judge whether maximal value transfinites:
If not, then order enters step 7 and 8;
If then enter step 61;
Step 61: judge whether overtime:
If then enter step 62;
If not, then return step 5;
Step 62: put data, record data comprise the logout of the electric current and voltage value behind electric current and voltage value, closing time and the combined floodgate that the put instrument powers on and dead electricity time last time, trip time and tripping operation are preceding, enter step 9 then;
Step 7: put data, record data comprise the logout of the electric current and voltage value behind electric current and voltage value, closing time and the combined floodgate that the put instrument powers on and dead electricity time last time, trip time and tripping operation are preceding;
Step 8: need to judge whether to report to the police:
If, promptly need to report to the police, then enter step 9;
If not, promptly do not need to report to the police, then return step 41;
Step 9: report to the police.
Total the above, a kind of neutral resistance method for measuring and recording mutation current of the present invention can be according to mutation current that monitors and voltage, according to the peaked size of electric current and the length of duration, the data of record are surveyed in storage on the one hand, in addition in the case of necessary, send alerting signal, can in time fix a breakdown, the analysis foundation that the data of recording can be used as the maintenance and the replacing of stake resistance is surveyed in storage.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (6)
1. a neutral resistance method for measuring and recording mutation current adopts computer management system to handle electric current and the voltage that obtains from the neutral resistance instrument for measuring and recording mutation current, and the step of its method comprises:
Step 1: initialization;
Step 2: the electric current of neutral resistance is sampled and filtering;
Step 3: power taking stream maximal value, promptly get the current value of the filtered maximum that obtains;
Step 4: judging whether transfinites, i.e. whether the data that sampling obtains surpass the limit value that is provided with in advance:
If the current maxima of promptly getting transfinites, then enter step 5;
If not, the current maxima of promptly getting does not transfinite, and then order enters step 41,42 and 43;
Step 41: to voltage sample and calibration;
Step 42: deposit normal data;
Step 43: judge whether communication port has signal:
If promptly communication port has signal, then enter step 44, return step 2 then;
Step 44: carry out communication;
If not, then return step 2;
Step 5: electric current is carried out continuous sampling;
Step 6: judge whether maximal value transfinites:
If not, then order enters step 7 and 8;
If then enter step 61;
Step 61: judge whether overtime:
If then enter step 62;
If not, then return step 5;
Step 62: the put data enter step 9 then;
Step 7: put data;
Step 8: need to judge whether to report to the police:
If, promptly need to report to the police, then enter step 9;
If not, promptly do not need to report to the police, then return step 41;
Step 9: report to the police.
2. a kind of neutral resistance method for measuring and recording mutation current according to claim 1 is characterized in that: be filtered into digital filtering in the described step 2.
3. a kind of neutral resistance method for measuring and recording mutation current according to claim 1, it is characterized in that: described step 1 initialization comprises the running status of automatic gauging each several part hardware, the time of start-of-record operation, import the parameter of various settings and correction, the storer zero clearing that needs are used.
4. a kind of neutral resistance method for measuring and recording mutation current according to claim 1 is characterized in that: described step 42 is deposited normal data in the normal data and is comprised transfinite the number of minutes, the voltage effective value of value the transfinite time of the number of minutes of value, maximum current effective value and generation, maximum voltage effective value and the time of generation, maximum current instantaneous value and the time of generation and the tripping operation number of times of generation of current effective value every day.
5. a kind of neutral resistance method for measuring and recording mutation current according to claim 1 is characterized in that: described step 7 put data comprise the logout of the electric current and voltage value behind electric current and voltage value, closing time and the combined floodgate that the put instrument powers on and dead electricity time last time, trip time and tripping operation are preceding.
6. a kind of neutral resistance method for measuring and recording mutation current according to claim 1 is characterized in that: described step 62 put data comprise the logout of the electric current and voltage value behind electric current and voltage value, closing time and the combined floodgate that the put instrument powers on and dead electricity time last time, trip time and tripping operation are preceding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710037707XA CN101256206B (en) | 2007-02-27 | 2007-02-27 | Method for measuring and recording mutation current of neutral point earthing resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710037707XA CN101256206B (en) | 2007-02-27 | 2007-02-27 | Method for measuring and recording mutation current of neutral point earthing resistor |
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| Publication Number | Publication Date |
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| CN101256206A true CN101256206A (en) | 2008-09-03 |
| CN101256206B CN101256206B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710037707XA Active CN101256206B (en) | 2007-02-27 | 2007-02-27 | Method for measuring and recording mutation current of neutral point earthing resistor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957402A (en) * | 2010-08-31 | 2011-01-26 | 上海华岭集成电路技术股份有限公司 | System and method for testing instantaneous current |
| CN107102195A (en) * | 2017-04-26 | 2017-08-29 | 顺特电气设备有限公司 | The electrical quantity processing of intelligent transformer terminal and network transfer method |
| CN109917230A (en) * | 2019-04-08 | 2019-06-21 | 重庆大学 | The neutral point monitoring and protecting integral method of distribution net work earthing fault containing resistance eutral grounding |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2032325U (en) * | 1987-10-01 | 1989-02-08 | 中国船舶工业总公司第七研究院第七二三研究所 | Automatic tour detector with dc earthing |
| CN1053129A (en) * | 1990-01-06 | 1991-07-17 | 吴湘汉 | Detect the method and the device of ground current |
| CN1150249A (en) * | 1995-11-10 | 1997-05-21 | 中国科学院空间科学与应用研究中心 | Ground resistance tester controlled by computer |
| CN2363356Y (en) * | 1998-11-30 | 2000-02-09 | 西安神电避雷器有限公司 | Neutral point grounding resistor |
-
2007
- 2007-02-27 CN CN200710037707XA patent/CN101256206B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957402A (en) * | 2010-08-31 | 2011-01-26 | 上海华岭集成电路技术股份有限公司 | System and method for testing instantaneous current |
| CN107102195A (en) * | 2017-04-26 | 2017-08-29 | 顺特电气设备有限公司 | The electrical quantity processing of intelligent transformer terminal and network transfer method |
| CN107102195B (en) * | 2017-04-26 | 2020-03-20 | 顺特电气设备有限公司 | Electric quantity processing and network transmission method of intelligent transformer terminal |
| CN109917230A (en) * | 2019-04-08 | 2019-06-21 | 重庆大学 | The neutral point monitoring and protecting integral method of distribution net work earthing fault containing resistance eutral grounding |
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| Publication number | Publication date |
|---|---|
| CN101256206B (en) | 2011-07-20 |
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