CN105116270A - Mutual inductor fault detection method for merging unit and protection control device - Google Patents
Mutual inductor fault detection method for merging unit and protection control device Download PDFInfo
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- CN105116270A CN105116270A CN201510416316.3A CN201510416316A CN105116270A CN 105116270 A CN105116270 A CN 105116270A CN 201510416316 A CN201510416316 A CN 201510416316A CN 105116270 A CN105116270 A CN 105116270A
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Abstract
The invention discloses a mutual inductor fault detection method for a merging unit and a protection control device. The method comprises converting secondary currents or voltage signals of multi-path mutual inductors into corresponding small voltage signals through an AC module, performing acquisition of the small-voltage signals through multiple groups of two-path AD acquisition circuits having different no-load characteristics, transmitting the acquired voltage signals to a CPU module to perform data judgments, judging, by the CPU module, whether abnormal broken lines or poor contact occur in secondary sides of the corresponding mutual inductor, marking error states if abnormities occur in the secondary sides of the mutual inductors, binding information message of the mutual inductors, where the error states occur, and sending message together through the CPU module, sending the information message and the sending message to the merging unit by the CPU module, sending the message to the protection control device by the merging unit, and making a logical protection action by the protection control device. Secondary abnormal line breakage or the secondary poor contact of small current or voltage mutual inductors can be rapidly judged; and the method is safe and reliable, prevents misoperation and has a good application prospect.
Description
Technical field
The present invention relates to intelligent substation automatic safety device technical field, be specifically related to a kind of mulual inductor malfunction detection method for merge cells, protecting control device.
Background technology
Along with intelligent substation construction has entered the large-scale promotion stage; because the technological accumulation of electronic mutual inductor is not yet ripe; the merge cells of traditional electromagnetic transformer and protecting control device is adopted still to use widely in intelligent substation; mutual inductor is as the first Primary Component of analog input formula merge cells and protecting control device, and its quality is ensured by components and parts producer always.
At present, in electric equipment operation process, merge cells and protecting control device substantially cannot monitor the duty of traditional small-sized mutual inductor and assess.If small-sized mutual inductor causes abnormal due to quality or operating mode reason and damages; its direct merged unit of wrong waveform exported and protecting control device gather and as the foundation of relay protection action; merge cells and protecting control error action of device can be caused to do; affect intelligent substation normally to work, cause inestimable loss.
From analog input formula merge cellses in 2012 and analog input numeral tripping operation formula protecting control device in China's Electric Power Industry large-scale application so far; in succession occur that more than ten cause mutual inductors are abnormal and damage the transformer station's error tripping fault caused, brought about great losses to Utilities Electric Co. and Electricity customers.
Therefore, urgently a kind of small-sized mulual inductor malfunction situation that can detect reliably at short notice on merge cells and protecting control device, and provide alarm means, the action behavior of locking mistake, be current urgent problem.
Summary of the invention
Technical matters solved by the invention overcomes in electric equipment operation process, and merge cells and protecting control device substantially cannot monitor the duty of traditional small-sized mutual inductor and assess, existing problem.The mulual inductor malfunction detection system of merge cells of the present invention, protecting control device and method; the shake that small current or the secondary abnormal broken line of voltage transformer (VT) or loose contact cause can be judged fast; mark the data as misdata rapidly; prevent merge cells in intelligent substation, protecting control device from being done by the interference of the data of exception the Logic judgment made mistake; safe and reliable; prevent misoperation, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
For a mulual inductor malfunction detection method for merge cells, protecting control device, it is characterized in that: comprise the following steps,
Step (1), by the interchange module with small area analysis or voltage transformer (VT), is converted to corresponding small voltage signal by the secondary current of multipath sensor on merge cells, protecting control device or voltage signal;
Step (2), by organizing the AD acquisition circuit of the different no-load characteristic of two-way, the AD acquisition circuit often organizing the different no-load characteristic of two-way carries out voltage signal acquisition to the road small voltage signal that step (1) is changed respectively more;
Step (3), sends the voltage signal that the AD acquisition circuit organizing the different no-load characteristic of two-way collects more to CPU module, and CPU module is used for, to the voltage signal gathered, carrying out discriminating data;
The result of the sampled point instantaneous value application condition that step (4) CPU module transmits according to the AD acquisition circuit often organizing the different no-load characteristic of two-way, judge whether the transformer secondary of its correspondence occurs abnormal broken line or loose contact, if sampled point instantaneous value error is less than or equal to 10% of the specified output numerical value of mutual inductor, then the secondary work of this mutual inductor is normal; If sampled point instantaneous value error is greater than 10% of the specified output numerical value of mutual inductor, there is abnormal broken line or loose contact in the secondary of this mutual inductor, and perform step (5);
Step (5), if abnormal broken line or loose contact appear in the secondary of mutual inductor, then this abnormality is labeled as error condition by CPU module;
Step (6), CPU module, by merge cells, protecting control device occurring each mutual inductor infomational message of error condition bundles with transmission message, forms outgoing message, sends to merge cells;
Step (7), outgoing message is sent to protecting control device by merge cells, and protecting control device, according to outgoing message, makes virtual protection action.
The aforesaid mulual inductor malfunction detection method for merge cells, protecting control device, is characterized in that: the group number that step (2) organizes the AD acquisition circuit of the different no-load characteristic of two-way more is that the quantity of mutual inductor on merge cells, protecting control device is consistent.
The aforesaid mulual inductor malfunction detection method for merge cells, protecting control device, is characterized in that: the AD acquisition circuit of the different no-load characteristic of two-way in step (2), and output, when zero load, is earthing potential by a road, and the numerical value collected is digital quantity zero; Output, when zero load, is fixed voltage by another road, and this magnitude of voltage by resistance adjustment to being greater than more than 50% of mutual inductor rated output voltage.
The invention has the beneficial effects as follows: the mulual inductor malfunction detection method for merge cells, protecting control device of the present invention; the shake that small current or the secondary abnormal broken line of voltage transformer (VT) or loose contact cause can be judged fast; mark the data as misdata rapidly; prevent merge cells in intelligent substation, protecting control device from being done by the interference of the data of exception the Logic judgment made mistake; safe and reliable; prevent misoperation, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of mulual inductor malfunction detection method of merge cells of the present invention, protecting control device.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
Mulual inductor malfunction detection method for merge cells, protecting control device of the present invention; the shake that small current or the secondary abnormal broken line of voltage transformer (VT) or loose contact cause can be judged fast; mark the data as misdata rapidly; prevent merge cells in intelligent substation, protecting control device from being done by the interference of the data of exception the Logic judgment made mistake; safe and reliable, prevent misoperation, as shown in Figure 1; comprise the following steps
Step (1), by the interchange module with small area analysis or voltage transformer (VT), is converted to corresponding small voltage signal by the secondary current of multipath sensor on merge cells, protecting control device or voltage signal;
Step (2), by organizing the AD acquisition circuit of the different no-load characteristic of two-way more, the AD acquisition circuit often organizing the different no-load characteristic of two-way carries out voltage signal acquisition to the road small voltage signal that step (1) is changed respectively, and wherein the group number of the AD acquisition circuit of the different no-load characteristic of many group two-way is that the quantity of mutual inductor on merge cells, protecting control device is consistent;
The AD acquisition circuit of the different no-load characteristic of two-way, output, when zero load, is earthing potential by a road, and the numerical value collected is digital quantity zero; Output, when zero load, is fixed voltage by another road, and this magnitude of voltage by resistance adjustment to being greater than more than 50% of mutual inductor rated output voltage;
Once the mutual inductor coil of front end, AD collector loop damages, cause AD acquisition circuit unloaded, then the numerical value that the AD acquisition circuit of the obstructed no-load characteristic of two-way collects is respectively the situation of 0 and a large value of fixed voltage;
Step (3), sends the voltage signal that the AD acquisition circuit organizing the different no-load characteristic of two-way collects more to CPU module, and CPU module is used for, to the voltage signal gathered, carrying out discriminating data;
The result of the sampled point instantaneous value application condition that step (4) CPU module transmits according to the AD acquisition circuit often organizing the different no-load characteristic of two-way, judge whether the transformer secondary of its correspondence occurs abnormal broken line or loose contact, if sampled point instantaneous value error is less than or equal to 10% of the specified output numerical value of mutual inductor, then the secondary work of this mutual inductor is normal; If sampled point instantaneous value error is greater than 10% of the specified output numerical value of mutual inductor, there is abnormal broken line or loose contact in the secondary of this mutual inductor, and perform step (5);
Step (5), if abnormal broken line or loose contact appear in the secondary of mutual inductor, then this abnormality is labeled as error condition by CPU module;
Step (6), CPU module, by merge cells, protecting control device occurring each mutual inductor infomational message of error condition bundles with transmission message, forms outgoing message, sends to merge cells;
Step (7), outgoing message is sent to protecting control device by merge cells, and protecting control device, according to outgoing message, makes virtual protection action.
Mulual inductor malfunction detection method for merge cells, protecting control device of the present invention; make that merge cells, protecting control device possess mulual inductor malfunction measuring ability; the shake that the secondary abnormal broken line of small area analysis voltage transformer (VT) or loose contact cause can be judged fast; mark the data as misdata rapidly; prevent transforming plant protecting control device from being done by the interference of the data of exception the Logic judgment made mistake, have a good application prospect.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (3)
1., for a mulual inductor malfunction detection method for merge cells, protecting control device, it is characterized in that: comprise the following steps,
Step (1), by the interchange module with small area analysis or voltage transformer (VT), is converted to corresponding small voltage signal by the secondary current of multipath sensor on merge cells, protecting control device or voltage signal;
Step (2), by organizing the AD acquisition circuit of the different no-load characteristic of two-way, the AD acquisition circuit often organizing the different no-load characteristic of two-way carries out voltage signal acquisition to the road small voltage signal that step (1) is changed respectively more;
Step (3), sends the voltage signal that the AD acquisition circuit organizing the different no-load characteristic of two-way collects more to CPU module, and CPU module is used for, to the voltage signal gathered, carrying out discriminating data;
The result of the sampled point instantaneous value application condition that step (4) CPU module transmits according to the AD acquisition circuit often organizing the different no-load characteristic of two-way, judge whether the transformer secondary of its correspondence occurs abnormal broken line or loose contact, if sampled point instantaneous value error is less than or equal to 10% of the specified output numerical value of mutual inductor, then the secondary work of this mutual inductor is normal; If sampled point instantaneous value error is greater than 10% of the specified output numerical value of mutual inductor, there is abnormal broken line or loose contact in the secondary of this mutual inductor, and perform step (5);
Step (5), if abnormal broken line or loose contact appear in the secondary of mutual inductor, then this abnormality is labeled as error condition by CPU module;
Step (6), CPU module, by merge cells, protecting control device occurring each mutual inductor infomational message of error condition bundles with transmission message, forms outgoing message, sends to merge cells;
Step (7), outgoing message is sent to protecting control device by merge cells, and protecting control device, according to outgoing message, makes virtual protection action.
2. the mulual inductor malfunction detection method for merge cells, protecting control device according to claim 1, is characterized in that: the group number that step (2) organizes the AD acquisition circuit of the different no-load characteristic of two-way more is that the quantity of mutual inductor on merge cells, protecting control device is consistent.
3. the mulual inductor malfunction detection method for merge cells, protecting control device according to claim 1, it is characterized in that: the AD acquisition circuit of the different no-load characteristic of two-way in step (2), output, when zero load, is earthing potential by one tunnel, and the numerical value collected is digital quantity zero; Output, when zero load, is fixed voltage by another road, and this magnitude of voltage by resistance adjustment to being greater than more than 50% of mutual inductor rated output voltage.
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| CN106207994A (en) * | 2016-08-19 | 2016-12-07 | 许继集团有限公司 | Line protection method and device for time blind area |
| CN106370907A (en) * | 2016-10-27 | 2017-02-01 | 杭州华春科技有限公司 | On-line anti-malfunction processing device and method for clamp measuring device |
| CN106526525A (en) * | 2016-10-11 | 2017-03-22 | 国网上海市电力公司 | Transformer secondary side monitoring method based on SCD modeling |
| CN109932676A (en) * | 2019-03-27 | 2019-06-25 | 国家电网有限公司 | The method for detecting abnormality of voltage transformer circuit |
| CN109932675A (en) * | 2019-03-27 | 2019-06-25 | 国家电网有限公司 | The method for detecting abnormality of current transformer loop |
| CN112731206A (en) * | 2020-12-07 | 2021-04-30 | 南京国电南自电网自动化有限公司 | Analog input type merging unit protection current transformer disconnection detection method |
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| CN106526525A (en) * | 2016-10-11 | 2017-03-22 | 国网上海市电力公司 | Transformer secondary side monitoring method based on SCD modeling |
| CN106370907A (en) * | 2016-10-27 | 2017-02-01 | 杭州华春科技有限公司 | On-line anti-malfunction processing device and method for clamp measuring device |
| CN106370907B (en) * | 2016-10-27 | 2019-12-13 | 杭州华春科技有限公司 | online anti-misoperation processing device and method for pincerlike measuring equipment |
| CN109932676A (en) * | 2019-03-27 | 2019-06-25 | 国家电网有限公司 | The method for detecting abnormality of voltage transformer circuit |
| CN109932675A (en) * | 2019-03-27 | 2019-06-25 | 国家电网有限公司 | The method for detecting abnormality of current transformer loop |
| CN112731206A (en) * | 2020-12-07 | 2021-04-30 | 南京国电南自电网自动化有限公司 | Analog input type merging unit protection current transformer disconnection detection method |
| CN112731206B (en) * | 2020-12-07 | 2023-08-15 | 南京国电南自电网自动化有限公司 | Analog input type merging unit protection current transformer broken line detection method |
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