CN111463752B - Transformer differential protection device and control method thereof - Google Patents
Transformer differential protection device and control method thereof Download PDFInfo
- Publication number
- CN111463752B CN111463752B CN202010382434.8A CN202010382434A CN111463752B CN 111463752 B CN111463752 B CN 111463752B CN 202010382434 A CN202010382434 A CN 202010382434A CN 111463752 B CN111463752 B CN 111463752B
- Authority
- CN
- China
- Prior art keywords
- current
- transformer
- side current
- primary side
- secondary side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 13
- 238000002347 injection Methods 0.000 claims abstract description 48
- 239000007924 injection Substances 0.000 claims abstract description 48
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000012937 correction Methods 0.000 claims description 39
- 239000011159 matrix material Substances 0.000 claims description 14
- 238000005457 optimization Methods 0.000 claims description 13
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 12
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a transformer differential protection device, comprising: the primary side current transformer is used for measuring the primary side current value of the transformer; the secondary side current transformer is used for measuring the secondary side current value of the transformer; a primary side current injection module for injecting a test current to a primary side of the transformer; the secondary side current injection module is used for injecting test current to the secondary side of the transformer; and the control module is respectively in communication connection with the primary side current transformer, the secondary side current transformer, the primary side current injection module and the secondary side current injection module, and is used for analyzing the differential protection signal of the transformer and sending out a corresponding control instruction. The invention can improve the defects of the prior art and improve the accuracy of differential protection action judgment.
Description
Technical Field
The invention relates to the technical field of transformer relay protection, in particular to a transformer differential protection device and a control method thereof.
Background
The transformer is a common power system device, and if abnormal conditions such as short circuit occur in the transformer, the transformer needs to be disconnected in time so as to prevent greater danger and loss. Transformer differential protection is a common way to protect a transformer. The existing transformer differential protection system is not accurate enough in judgment and is easy to malfunction.
Disclosure of Invention
The invention aims to provide a transformer differential protection device and a control method thereof, which can solve the defects of the prior art and improve the accuracy of differential protection action judgment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A transformer differential protection device comprising:
the primary side current transformer is used for measuring the primary side current value of the transformer;
the secondary side current transformer is used for measuring the secondary side current value of the transformer;
the primary side current injection module is used for injecting test current to the primary side of the transformer;
the secondary side current injection module is used for injecting test current to the secondary side of the transformer;
and the control module is respectively in communication connection with the primary side current transformer, the secondary side current transformer, the primary side current injection module and the secondary side current injection module, and is used for analyzing the differential protection signal of the transformer and sending out a corresponding control instruction.
A control method of the transformer differential protection device comprises the following steps:
A. the control module reads the current values of the primary side current transformer and the secondary side current transformer in real time and calculates the differential current of the transformer;
B. if the differential current exceeds the first limit value and is not greater than the second limit value, go to step C; if the differential current exceeds a second limit value, a differential protection instruction is sent out, and the control flow is ended;
C. alternately starting a primary side current injection module and a secondary side current injection module, and injecting a test current into the transformer; when the primary side current injection module is started, the control module reads a current signal of the secondary side current transformer, and when the secondary side current injection module is started, the control module reads a circuit signal of the primary side current transformer;
D. correcting the measured current value of the secondary side current transformer in the step A according to the injected current signal of the primary side current injection module and the measured current signal of the secondary side current transformer in the step C;
E. correcting the measured current signal of the primary side current transformer in the step A according to the injected current signal of the secondary side current injection module and the measured current signal of the primary side current transformer in the step C;
F. if the corrected differential current exceeds a first limit value, a differential protection instruction is sent out, otherwise, the differential protection instruction is not sent out;
this time, the control flow ends.
Preferably, in the step C, the duration of injecting the test current into the transformer each time is 5-10 ms, the test current is injected in a square wave and sine wave alternating mode, and the effective value of the test current is 1-2% of that of the transformer on the injection side.
Preferably, in step D, the fourier decomposition is performed on the measurement current signal after the current injection to obtain a current component corresponding to the injection current component in the measurement current signal, a first set of correction functions is obtained from the obtained current component and the injection current, and the measurement current value is corrected using the first set of correction functions.
Preferably, in step E, the fourier decomposition is performed on the measurement current signal after the current injection, a current component corresponding to the injection current component in the measurement current signal is obtained, a second set of correction functions is obtained according to the obtained current component and the injection current, and the measurement current value is corrected by using the second set of correction functions.
Preferably, the optimization is performed before using the first set of correction functions and the second set of correction functions, including in particular,
establishing feature matrices G and H of a first correction function set and a second correction function set; coefficient matrix G for obtaining characteristic matrix G and characteristic matrix H1And H1To G1And H1Applying sparse constraints;
determining an optimized objective function
Wherein,
represents the square of the F norm of the matrix;
and taking the minimum optimization objective function Fmin as an optimization objective, and combining and simplifying the function samples in the first correction function set and the second correction function set to realize iteration of the feature matrixes G and H until the optimization objective is reached.
Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: according to the invention, the small current is injected into the transformer, so that the measurement current of the current transformer is corrected, and the probability of misoperation caused by the interference of the measurement current is effectively reduced. In order to reduce the measurement current correction time as much as possible, the complexity of the correction function set is reduced by optimizing the correction function set. And iteration is carried out by using a specially designed optimization objective function, so that the iteration can be quickly completed, and the operation speed is further improved.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention.
In the figure: 1. a primary side current transformer; 2. a secondary side current transformer; 3. a primary side current injection module; 4. a secondary side current injection module; 5. and a control module.
Detailed Description
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description and the description of the attached drawings, and the specific connection mode of each part adopts the conventional means of mature bolts, rivets, welding, sticking and the like in the prior art, and the detailed description is not repeated.
Referring to fig. 1, one embodiment of the present invention includes,
a primary side current transformer 1 for measuring a primary side current value of the transformer;
the secondary side current transformer 2 is used for measuring the secondary side current value of the transformer;
a primary side current injection module 3 for injecting a test current to the primary side of the transformer;
a secondary side current injection module 4 for injecting a test current to the secondary side of the transformer;
and the control module 5 is in communication connection with the primary side current transformer 1, the secondary side current transformer 2, the primary side current injection module 3 and the secondary side current injection module 4 respectively, and is used for analyzing the differential protection signals of the transformer and sending out corresponding control instructions.
A control method of the transformer differential protection device comprises the following steps:
A. the control module 5 reads the current values of the primary side current transformer 1 and the secondary side current transformer 2 in real time and calculates the differential current of the transformer;
B. if the differential current exceeds the first limit value and is not greater than the second limit value, go to step C; if the differential current exceeds a second limit value, a differential protection instruction is sent out, and the control flow is ended;
C. alternately starting the primary side current injection module 3 and the secondary side current injection module 4, and injecting a test current into the transformer; when the primary side current injection module 3 is started, the control module 5 reads a current signal of the secondary side current transformer 2, and when the secondary side current injection module 4 is started, the control module 5 reads a circuit signal of the primary side current transformer 1;
D. correcting the measured current value of the secondary side current transformer 2 in the step A according to the injected current signal of the primary side current injection module 3 and the measured current signal of the secondary side current transformer 2 in the step C;
E. correcting the measured current signal of the primary side current transformer 1 in the step A according to the injected current signal of the secondary side current injection module 4 and the measured current signal of the primary side current transformer 1 in the step C;
F. if the corrected differential current exceeds a first limit value, a differential protection instruction is sent out, otherwise, the differential protection instruction is not sent out;
this time, the control flow ends.
In the step C, the duration of injecting the test current into the transformer each time is 10ms, the test current is injected in a square wave and sine wave alternating mode, and the effective value of the test current is 1 per mill of the effective value of the transformer on the injection side.
And D, performing Fourier decomposition on the measured current signal after the current is injected to obtain a current component corresponding to the injected current component in the measured current signal, obtaining a first correction function set according to the obtained current component and the injected current, and correcting the measured current value by using the first correction function set.
And E, performing Fourier decomposition on the measurement current signal after the current is injected to obtain a current component corresponding to the injection current component in the measurement current signal, obtaining a second correction function set according to the obtained current component and the injection current, and correcting the measurement current value by using the second correction function set.
The optimization is performed prior to using the first set of correction functions and the second set of correction functions, and specifically includes,
establishing feature matrices G and H of a first correction function set and a second correction function set; coefficient matrix G for obtaining characteristic matrix G and characteristic matrix H1And H1To G1And H1Applying sparse constraints;
determining an optimized objective function
Wherein,
represents the square of the F norm of the matrix;
and taking the minimum optimization objective function Fmin as an optimization objective, and combining and simplifying the function samples in the first correction function set and the second correction function set to realize iteration on the characteristic matrixes G and H until the optimization objective is reached.
In addition, the first set of correction functions and the second set of correction functions are obtained in the same manner, including,
marking a characteristic curve segment in the injected current, and searching a characteristic output part linearly related to the marked characteristic curve segment and a non-characteristic output part nonlinearly related to the marked characteristic curve segment in a current component obtained by Fourier decomposition;
establishing an incidence mapping relation between the characteristic curve segment and the characteristic output part, and adding a corresponding correction function set;
and establishing a distortion process matrix of the characteristic curve segment and the non-characteristic output part, and updating the correction function set by using the distortion process matrix to ensure that each correction function has a distortion component and the deviation value before and after the update of each correction function is minimum.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A control method of a transformer differential protection device, the transformer differential protection device comprising:
a primary side current transformer (1) for measuring a primary side current value of the transformer;
the secondary side current transformer (2) is used for measuring the secondary side current value of the transformer;
a primary side current injection module (3) for injecting a test current to the primary side of the transformer;
the secondary side current injection module (4) is used for injecting test current to the secondary side of the transformer;
the control module (5) is respectively in communication connection with the primary side current transformer (1), the secondary side current transformer (2), the primary side current injection module (3) and the secondary side current injection module (4) and is used for analyzing differential protection signals of the transformer and sending out corresponding control instructions;
the method is characterized by comprising the following steps:
A. the control module (5) reads the current values of the primary side current transformer (1) and the secondary side current transformer (2) in real time and calculates the differential current of the transformer;
B. if the differential current exceeds the first limit value and is not greater than the second limit value, go to step C; if the differential current exceeds a second limit value, a differential protection instruction is sent out, and the control flow is finished;
C. alternately starting a primary side current injection module (3) and a secondary side current injection module (4) to inject a test current into the transformer; when the primary side current injection module (3) is started, the control module (5) reads a current signal of the secondary side current transformer (2), and when the secondary side current injection module (4) is started, the control module (5) reads a circuit signal of the primary side current transformer (1);
D. correcting the measured current value of the secondary side current transformer (2) in the step A according to the injected current signal of the primary side current injection module (3) and the measured current signal of the secondary side current transformer (2) in the step C;
carrying out Fourier decomposition on the measured current signal after current injection to obtain a current component corresponding to the injected current component in the measured current signal, obtaining a first correction function set according to the obtained current component and the injected current, and correcting the measured current value by using the first correction function set;
E. correcting the measured current signal of the primary side current transformer (1) in the step A according to the injected current signal of the secondary side current injection module (4) and the measured current signal of the primary side current transformer (1) in the step C;
performing Fourier decomposition on the measured current signal after the current is injected to obtain a current component corresponding to the injected current component in the measured current signal, obtaining a second correction function set according to the obtained current component and the injected current, and correcting the measured current value by using the second correction function set;
F. if the corrected differential current exceeds a first limit value, a differential protection instruction is sent out, otherwise, the differential protection instruction is not sent out;
this time, the control flow ends.
2. The method for controlling a transformer differential protection device according to claim 1, wherein: and C, injecting the test current into the transformer for 5-10 ms each time, wherein the test current is injected in a square wave and sine wave alternating mode, and the effective value of the test current is 1-2 per mill of that of the injection side transformer.
3. The method for controlling a transformer differential protection device according to claim 1, wherein: the optimization is performed prior to using the first set of correction functions and the second set of correction functions, and specifically includes,
establishing feature matrices G and H of a first correction function set and a second correction function set; coefficient matrix G for obtaining characteristic matrix G and characteristic matrix H1And H1To G, to1And H1Applying sparse constraints;
determining an optimized objective function
Wherein, in the process,
represents the square of the F norm of the matrix;
and taking the minimum optimization objective function Fmin as an optimization objective, and combining and simplifying the function samples in the first correction function set and the second correction function set to realize iteration of the feature matrixes G and H until the optimization objective is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010382434.8A CN111463752B (en) | 2020-05-08 | 2020-05-08 | Transformer differential protection device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010382434.8A CN111463752B (en) | 2020-05-08 | 2020-05-08 | Transformer differential protection device and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111463752A CN111463752A (en) | 2020-07-28 |
| CN111463752B true CN111463752B (en) | 2022-07-12 |
Family
ID=71678696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010382434.8A Active CN111463752B (en) | 2020-05-08 | 2020-05-08 | Transformer differential protection device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111463752B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539974A (en) * | 2012-01-10 | 2012-07-04 | 首钢水城钢铁（集团）有限责任公司 | Differential protection testing method for transformer |
| CN104950203A (en) * | 2015-06-17 | 2015-09-30 | 国网山东潍坊市寒亭区供电公司 | Checking method for current protection circuit of transformer |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8570181B2 (en) * | 2010-03-15 | 2013-10-29 | Siemens Industry, Inc. | Method and apparatus for supervisory circuit for ground fault circuit interrupt device |
-
2020
- 2020-05-08 CN CN202010382434.8A patent/CN111463752B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539974A (en) * | 2012-01-10 | 2012-07-04 | 首钢水城钢铁（集团）有限责任公司 | Differential protection testing method for transformer |
| CN104950203A (en) * | 2015-06-17 | 2015-09-30 | 国网山东潍坊市寒亭区供电公司 | Checking method for current protection circuit of transformer |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111463752A (en) | 2020-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103487782B (en) | Electric meter calibrating method and automatic calibrating system | |
| MX9605934A (en) | Antenna array calibration. | |
| CA2405693A1 (en) | Method and arrangement for maintaining synchronization in association with resetting a communication connection | |
| CN106899359A (en) | A kind of WIFI module RF calibration method | |
| CN103686968A (en) | Calibration method and calibration circuit for transmitted power of digital microwave transceiver | |
| CN111463752B (en) | Transformer differential protection device and control method thereof | |
| CN101355404A (en) | Apparatus and method for regulating transmitter parameter with optimization | |
| CN103701481B (en) | A kind of incoming level calibration steps of digital microwave transceiver | |
| CN111272277A (en) | Laser pulse waveform measurement distortion correction method and system based on neural network | |
| CN108614231A (en) | A kind of quick calibration method based on Electronic Calibration part | |
| CN105025503A (en) | Standing-wave ratio detection method and system for TD-LTE (Time Division Long Term Evolution) RRU (Remote RF Unit) | |
| CN101350643A (en) | Method for compensating RF module performance and improved RF module | |
| CN113189449B (en) | Power cable intelligent monitoring system based on unmanned aerial vehicle | |
| CN109470939B (en) | Line loss point inspection system and method | |
| CN103874111B (en) | Direct discharging station adaptive optimization method based on isolation detection | |
| CN114448532B (en) | Detection and debugging system and method for wireless data communication terminal | |
| CN112126907A (en) | Vacuum coating control system and control method thereof, and vacuum coating equipment | |
| CN117346866A (en) | Ultrasonic water meter batch calibration device and method | |
| CN106443248A (en) | Rapid and automatic measuring method for saturation characteristic of travelling wave tube | |
| CN103973250B (en) | DPD MCPA power amplifier gain-adaptive compensation method, system and device | |
| CN112000085B (en) | Network transmission performance diagnosis system based on 5G big data | |
| CN115144809A (en) | Remote calibration method and system for intelligent electric meter | |
| CN106341145A (en) | Signal receiving method and device | |
| CN101193404B (en) | A method for detecting calibration correction of base station in SCDMA system | |
| CN111473912B (en) | Simple, convenient and efficient digital air pressure sensor adjusting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220621 Address after: 523716 Room 101, building 1, No. 38, Yanhe East Road, Tangxia Town, Dongguan City, Guangdong Province Applicant after: Dongguan boshiyuan Electronic Technology Co.,Ltd. Address before: 071000 No. 67, zone 1, nanyingtou village, Donglu Township, Qingyuan County, Baoding City, Hebei Province Applicant before: Li Qiang |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |