CN102664392B - Differential protection method based on redundancy CT (Computed Tomography) winding - Google Patents
Differential protection method based on redundancy CT (Computed Tomography) winding Download PDFInfo
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Abstract
The invention relates to a differential protection method based on a redundancy CT (Computed Tomography) winding, belonging to the technical field of relay protection of an electric power system. The differential protection method comprises the following steps of: simultaneously leading sampling data for carrying out differential protection on the two redundancy CT windings of a current transformers at each side into a relay protection device; in a normal operation process, carrying out the differential protection on each side, utilizing the sampling data of one CT winding and detecting whether the sampling data of the CT winding is abnormal or not in real time; when the sampling data is abnormal, automatically switching the sampling data at the side to the other CT winding and starting to detect whether the sampling data of the CT winding is abnormal or not; and carrying out locking differential protection only if the sampling data of the two CT windings is abnormal. According to the differential protection method disclosed by the invention, the problem that the locking differential protection needs to be carried out when one CT winding at one side is abnormal is solved, and the reliability of the protection device is improved.
Description
Technical field
The present invention relates to a kind of differential protecting method based on redundancy CT winding, belong to Relay Protection Technology in Power System field.
Background technology
Differential protection is as the main protection of protected equipment in electric power system, and it plays very important effect to the safe operation of electric power system, but the harm that the incorrect operation (comprising tripping and malfunction) of protection causes to electric power system is also huge.In recent years, along with the promulgation of China's electronic type voltage transformer summation current transformer national standard, electronic mutual inductor is applied more and more extensive in electric power system.Compared with traditional instrument transformer, although electronic mutual inductor has good transient state progress of disease characteristic, without ferro resonance, without advantages such as magnetic saturation.As the sensing element of primary system in intelligent substation, electronic mutual inductor is the sampled data source of all relaying protections.For guaranteeing the reliability of relaying protection; electronic current mutual inductor by two independently CT winding gather; each CT winding adopts the same merge cells of double A/D system access; the logical process-level network of two-way A/D digital sample values that each merge cells is exported each CT winding enters protective device; therefore the sampled data that, protective device can obtain two CT windings of electronic mutual inductor is simultaneously for differential protection.The every side of current differential protection has only been introduced CT winding two-way A/D sampled data of instrument transformer, and the sampled data of Dang Mou road A/D occurs after abnormal needing Blocking Differential Protection, if protected device fails now, differential protection will tripping.
Summary of the invention
The object of this invention is to provide a kind of differential protecting method based on redundancy CT winding, to solve the problem that causes differential protection tripping after every side only has a CT winding sampled data abnormal.
The present invention provides a kind of differential protecting method based on redundancy CT winding for solving the problems of the technologies described above, and the step of this differential protecting method is as follows:
1). the sampled data of two CT windings of every differential protection side current transformer is all introduced to protective device;
2). every side is used the sampled data of one of them CT winding, and whether detect in real time the CT winding sampled data that every side used abnormal;
3) if. when certain side current transformer uses a CT winding sampled data abnormal, the sampled data of this side is switched to the sampled data of another CT winding, and detects in real time the sampled data of this CT winding;
4) if. when two CT winding sampled datas of certain side current transformer are all abnormal, take Blocking Differential Protection.
The abnormal determination methods of CT winding sampled data of described every side current transformer is that absolute deviation and the relative deviation by comparing CT winding two-way A/D sampled instantaneous value data judges that whether sampled value data are abnormal, and its discriminant equation is:
Wherein first via A/D sampled value in CT winding, y is the second road A/D sampled value in CT winding.
Described step 4) in when taking Blocking Differential Protection action its locking sign answer broadening 20ms, the problem that absolute deviation criterion is returned when solving of ac sampled value zero passage.
The invention has the beneficial effects as follows: the present invention introduces protective device by the sampled data of two CT windings of every differential protection side current transformer simultaneously, during normal operation, whether the every side of differential protection is used the sampled data of one of them CT winding and detects in real time this CT winding sampled data abnormal, whether extremely, when sampled data is abnormal, automatically the sampled data of this side is switched to another CT winding and start to detect this CT winding sampled data, while only having two CT winding sampled datas of this side all abnormal, just carry out Blocking Differential Protection, solved the problem that needs Blocking Differential Protection when certain side only has a CT winding sampled data abnormal, improved the reliability of protective device.
Accompanying drawing explanation
Fig. 1 is differential protection data-acquisition loop schematic diagram of the present invention;
Fig. 2 is the differential protecting method data processing schematic diagram based on redundancy CT winding of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Differential protecting method based on redundancy CT winding is mainly used in the high pressure protective relaying device of intelligent substation; the sampled data of two CT windings of every differential protection side current transformer is introduced to protective device simultaneously; during normal operation, every side is only used the sampled data of one of them CT winding, and the sampled data of another CT winding is standby.Electronic current mutual inductor by two independently CT winding gather; each CT winding adopts the same merge cells of double A/D system access; the logical process-level network of two-way A/D digital sample values of a CT winding of each merge cells output enters protective device, as shown in Figure 1.
Based on the differential protecting method of redundancy CT winding, using the data exchange function of redundancy CT winding submodule independently in differential protection, this module drops into all the time, and its schematic diagram as shown in Figure 2.Because sampled data abnormality detection criterion absolute deviation when the of ac zero passage exists, return, when two CT winding sampled datas of certain side all need latch-up protection extremely, its locking sign is answered broadening 20ms.
Differential protecting method step based on redundancy CT winding is as follows:
1. the sampled data of two CT windings of every differential protection side current transformer is introduced to protective device simultaneously; during normal operation, the every side of differential protection is used the sampled data of one of them CT winding and is detected in real time this CT winding sampled data and judges whether to occur that its criterion is extremely:
In above formula, x is the first via A/D sampled value of CT winding, and y is the second road A/D sampled value of CT winding, I
nfor the rated current of current transformer, if sampled data does not have when abnormal, this side sampled data of differential protection is not switched.
2. when detecting that CT winding sampled data of certain side is abnormal, differential protection switches to the sampled data of this side another CT winding automatically, and whether detect in real time this CT winding sampled data abnormal.
If take Blocking Differential Protection when 3. two of this side CT winding sampled datas are all abnormal.
Differential protecting method based on redundancy CT winding is introduced protective device by the sampled data of two CT windings of every differential protection side current transformer simultaneously; during normal operation, whether the every side of differential protection is used the sampled data of one of them CT winding and detects in real time this CT winding sampled data abnormal; when sampled data is abnormal, automatically the sampled data of this side is switched to another CT winding and detects this CT winding sampled data whether abnormal, if Blocking Differential Protection just when two CT winding sampled datas of this side are all abnormal.
Claims (3)
1. the differential protecting method based on redundancy CT winding, is characterized in that: the step of this differential protecting method is as follows:
1). the sampled data of two CT windings of every differential protection side current transformer is all introduced to protective device, and described every side current transformer comprises the CT winding of two redundancies, and each CT winding adopts double A/D system;
2). every side is used the A/D sampled data of one of them CT winding, and whether detect in real time the A/D sampled data of the CT winding that every side used abnormal;
3) if. when certain side current transformer uses the A/D sampled data of a CT winding abnormal, the sampled data of this side is switched to the A/D sampled data of another CT winding, and detects in real time the A/D sampled data of this CT winding;
4) if. when the A/D sampled data of two CT windings of certain side current transformer is all abnormal, take Blocking Differential Protection.
2. the differential protecting method based on redundancy CT winding according to claim 1; it is characterized in that: the abnormal determination methods of CT winding sampled data of described every side current transformer is that absolute deviation and the relative deviation by comparing CT winding two-way A/D sampled instantaneous value data judges that whether sampled value data are abnormal, and its discriminant equation is:
Wherein x is first via A/D sampled value in CT winding, and y is the second road A/D sampled value in CT winding, I
nfor the rated current of current transformer.
3. the differential protecting method based on redundancy CT winding according to claim 1; it is characterized in that: in described step 4), its locking sign is answered broadening 20ms when taking Blocking Differential Protection action the problem that absolute deviation criterion is returned when solving of ac sampled value zero passage.
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| CN201210133338.5A CN102664392B (en) | 2012-04-28 | 2012-04-28 | Differential protection method based on redundancy CT (Computed Tomography) winding |
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| CN201210133338.5A CN102664392B (en) | 2012-04-28 | 2012-04-28 | Differential protection method based on redundancy CT (Computed Tomography) winding |
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| CN102664392B true CN102664392B (en) | 2014-04-23 |
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| CN104246629B (en) * | 2012-10-02 | 2016-10-12 | 富士电机株式会社 | redundant operation processing system |
| CN104332297A (en) * | 2014-09-19 | 2015-02-04 | 国家电网公司 | Current transformer for microcomputer protection device |
| CN105914716A (en) * | 2015-10-27 | 2016-08-31 | 南华大学 | Zero-sequence current differential protection phase selection method |
| CN113036711B (en) * | 2019-06-05 | 2022-08-12 | 国网安徽省电力有限公司铜陵供电公司 | Method for acquiring abnormal differential protection locking system by using electronic transformer data |
| CN110401175A (en) * | 2019-06-19 | 2019-11-01 | 南京南瑞继保工程技术有限公司 | A kind of relay protection redundancy sampling optimization method |
| CN110601149B (en) * | 2019-09-23 | 2020-12-04 | 江苏联能电力科学研究院有限公司 | Bus protection method and device based on redundant differential current judgment |
| CN113589023B (en) * | 2020-04-30 | 2024-04-30 | 南京南瑞继保电气有限公司 | Rapid detection method and device for single-set alternating current measurement abnormality of redundant system |
| CN113075447B (en) * | 2021-02-04 | 2024-06-18 | 浙江华云信息科技有限公司 | 400V low-voltage distribution network intelligent detection device and method |
| CN113572576B (en) * | 2021-07-16 | 2022-07-29 | 南方电网数字电网研究院有限公司 | Sampling data verification method and device, relay protection device and storage medium |
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| DE19839616A1 (en) * | 1998-08-31 | 2000-03-02 | Siemens Ag | Protection device for low-voltage networks |
| EP2064793A1 (en) * | 2006-09-22 | 2009-06-03 | Siemens Aktiengesellschaft | Method for producing a fault signal, which indicates a fault present in a secondary current transformer circuit, and differential protective device |
| CN101576601B (en) * | 2009-06-16 | 2011-08-03 | 重庆大学 | Hidden failure diagnostic method of digital transformer protector measuring loop |
| CN102142672B (en) * | 2011-05-05 | 2013-11-06 | 重庆大学 | Current differential protection method for built-in winding mutual inductor of three-phase transformer |
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