CN114675212A - Method for studying and judging abnormal connection of neutral point of distribution transformer - Google Patents
Method for studying and judging abnormal connection of neutral point of distribution transformer Download PDFInfo
- Publication number
- CN114675212A CN114675212A CN202210299999.9A CN202210299999A CN114675212A CN 114675212 A CN114675212 A CN 114675212A CN 202210299999 A CN202210299999 A CN 202210299999A CN 114675212 A CN114675212 A CN 114675212A
- Authority
- CN
- China
- Prior art keywords
- zero
- voltage
- distribution transformer
- phase voltage
- sequence
- 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.)
- Granted
Links
- 230000007935 neutral effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 14
- 238000004364 calculation method Methods 0.000 claims description 11
- 230000005856 abnormality Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing 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
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a method for studying and judging the connection abnormity of a neutral point of a distribution transformer, which comprises the following steps: acquiring a three-phase voltage curve and a zero-sequence current curve of the same day at the low-voltage side of the distribution transformer; forming a data set by each phase voltage value and each zero sequence current value at the same moment to obtain a plurality of data sets; respectively calculating zero sequence voltage amplitude values corresponding to the data sets; respectively calculating the three-phase voltage unbalance of each data set; calculating the correlation between the zero sequence voltage and the zero sequence current; if the three-phase voltage of the distribution transformer is unbalanced and the zero-sequence voltage and the zero-sequence current have strong correlation, the distribution transformer has abnormal connection of the neutral point of the electric line. The method is simple and practical, effectively improves the working efficiency and reduces the missing rate.
Description
Technical Field
The invention belongs to the field of power distribution network monitoring, and particularly relates to a method for studying and judging abnormal connection of a neutral point of a distribution transformer.
Background
The maintenance of the healthy operation of the distribution transformer is one of the key links for guaranteeing the social electricity utilization. The problem of unbalanced three-phase voltage is caused by abnormal connection of the neutral point of the distribution transformer, so that the quality of electric energy supplied by a low-voltage transformer area is influenced, and the normal use of user electric equipment is influenced in severe cases. The common management method is to monitor the operation state of the distribution transformer, perform data analysis on the collected voltage, current and other electrical data, and check abnormal events. Under the working mode, abnormal problems such as abnormal neutral point connection and the like are difficult to find quickly and timely, and the problems of low efficiency, high missing rate and the like exist depending on manual investigation of technicians.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for studying and judging the abnormal connection of a neutral point of a distribution transformer, which adopts the following technical scheme:
a method for studying and judging the connection abnormity of a neutral point of a distribution transformer comprises the following steps:
s1, acquiring a three-phase voltage curve and a zero-sequence current curve of the low-voltage side of the distribution transformer in the same day;
s2, forming a data set by the phase voltage values and the zero sequence current values at the same moment according to the three-phase voltage curve and the zero sequence current curve, and acquiring a plurality of data sets;
s3, respectively calculating zero sequence voltage amplitude values corresponding to the data sets;
s4, respectively calculating the unbalance degree of the three-phase voltage of each data set, and judging whether the three-phase voltage is balanced according to the unbalance degree;
s5, calculating the correlation between the zero sequence voltage and the zero sequence current, and judging whether the two have strong correlation according to the correlation;
and S6, if the three-phase voltage of the distribution transformer is unbalanced and the zero-sequence voltage and the zero-sequence current have strong correlation, the distribution transformer has abnormal connection of the neutral point of the electric line.
Further, in step S2, 96 data sets at different time instants are obtained, and data sets with incomplete data items or significantly erroneous data are eliminated.
Further, in step S3, zero sequence voltage phasor
The real part of (a) is a zero-sequence voltage amplitude, the zero-sequence voltage phasor
The calculation formula of (a) is as follows:
wherein U isA∠0°、UB∠120°、UCThe angle 240 degrees respectively represents A, B, C three-phase voltage.
Further, in step S4, if the proportion of the data group in which the three-phase voltage unbalance is located in the balance interval is greater than the balance determination threshold, the three-phase voltage of the distribution transformer is considered to be balanced, otherwise, the three-phase voltage is unbalanced; the calculation formula of the three-phase voltage unbalance epsilon is as follows: e ═ U0/220，U0Is the zero sequence voltage amplitude.
Further, in step S5, a Pearson correlation coefficient r of the zero-sequence voltage and the zero-sequence current is calculated, and if | r | is greater than a correlation determination threshold, it is indicated that the zero-sequence voltage and the zero-sequence current have strong correlation; the calculation formula of the Pearson correlation coefficient r is as follows:
wherein, I0,iAnd U0,iAnd respectively representing the zero sequence current and the corresponding zero sequence voltage amplitude of the ith data set, wherein n is the total number of the data sets.
Further, the balance interval is [0, 2% ], and the balance judgment threshold is 90%; the correlation determination threshold value is 0.6.
The invention has the beneficial effects that:
the method is simple and practical, is easy to convert into a software algorithm module, realizes batch automatic study and judgment of the abnormity, effectively improves the working efficiency and reduces the missing rate.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a three-phase voltage curve diagram of a low-voltage side of a distribution transformer at a certain day in an embodiment of the invention;
fig. 3 is a zero sequence current curve diagram of the low-voltage side of a certain distribution transformer at a certain day in the embodiment of the invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
In order to find the abnormality of the connection of the neutral point at the low-voltage side of the distribution transformer in time, the invention provides a method for studying and judging the abnormality of the connection of the neutral point of the distribution transformer, as shown in fig. 1, which mainly comprises the following steps:
And 2, acquiring 96 three-phase voltage values and zero-sequence current values corresponding to time points according to the voltage curve and the current curve to form 96 groups of data, wherein each group of data comprises four data items (namely the three-phase voltage values and the zero-sequence current values at the same moment), performing data inspection group by group, rejecting the data groups with incomplete data items or data obviously exceeding a reasonable range, and finally obtaining n effective data groups.
Step 3, respectively calculating the zero sequence voltage corresponding to each effective data set
The calculation formula is as follows:
wherein, UA∠0°、UB∠120°、UCThe angle of 240 degrees respectively represents A, B, C three-phase voltage and phasor
The real part of the zero sequence voltage is the amplitude value U of the zero sequence voltage0。
Step 4, respectively calculating the three-phase voltage unbalance epsilon of each effective data set, counting the proportion that epsilon falls in the interval of [0, 2% ], if the proportion is more than 90%, considering that the three-phase voltage of the distribution transformer is balanced, otherwise, unbalance; the calculation formula of the three-phase voltage unbalance epsilon is as follows:
ε＝U0/220
step 5, calculating a Pearson correlation coefficient r of the zero-sequence voltage and the zero-sequence current, judging the correlation strength of the zero-sequence voltage and the zero-sequence current, and if the absolute value r is greater than 0.6, indicating that the absolute value r and the zero-sequence current have strong correlation; the calculation formula of the Pearson correlation coefficient r is as follows:
wherein, I0,iAnd U0,iZero sequence current and corresponding zero respectively representing the ith valid data setThe sequence voltage amplitude.
And 6, if the three-phase voltage at the low-voltage side of the distribution transformer is unbalanced and the zero-sequence voltage and the zero-sequence current have strong correlation, determining that the distribution transformer has abnormal connection of the neutral point of the electric line.
In order to explain the practice of the present invention in more detail, the following description will be made with reference to actual data.
And obtaining 96 effective data sets according to a voltage curve and a zero-sequence current curve (shown in figures 2 and 3) of the low-voltage side of the distribution transformer of a certain low-voltage transformer area at a certain day. Group-by-group calculation of zero sequence voltage at low-voltage side of distribution transformer
And three-phase voltage unbalance degree epsilon, and only 12 groups of calculation results epsilon fall in 0,2 percent]And in the interval, the percentage is 12.50%, and the three-phase voltage on the low-voltage side of the distribution transformer is judged to be unbalanced. And (3) calculating a Pearson correlation coefficient r, wherein r is 0.96, and the condition that r is greater than 0.6 is met, so that the zero sequence voltage and the zero sequence current have strong correlation. In summary, it is considered that the distribution transformer low-voltage side height is suspected of causing a problem of an abnormal connection of the neutral point of the electric line. And (4) through field inspection, the wiring abnormality at the connection position of the zero line and the neutral line at the low-voltage side of the distribution transformer is found, and the analysis result is met.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (6)
1. A method for studying and judging the connection abnormity of a neutral point of a distribution transformer is characterized by comprising the following steps:
s1, acquiring a three-phase voltage curve and a zero-sequence current curve of the low-voltage side of the distribution transformer in the same day;
s2, forming a data set by the phase voltage values and the zero sequence current values at the same moment according to the three-phase voltage curve and the zero sequence current curve, and acquiring a plurality of data sets;
s3, respectively calculating zero sequence voltage amplitude values corresponding to the data sets;
s4, respectively calculating the unbalance degree of the three-phase voltage of each data set, and judging whether the three-phase voltage is balanced according to the unbalance degree;
s5, calculating the correlation between the zero sequence voltage and the zero sequence current, and judging whether the two have strong correlation according to the correlation;
and S6, if the three-phase voltage of the distribution transformer is unbalanced and the zero-sequence voltage and the zero-sequence current have strong correlation, the distribution transformer has abnormal connection of the neutral point of the electric line.
2. The method as claimed in claim 1, wherein in step S2, 96 data sets at different time are obtained, and data sets with incomplete data items or significantly incorrect data are eliminated.
3. The method for determining the abnormal connection of the neutral point of the distribution transformer as claimed in claim 1, wherein in step S3, the zero sequence voltage phasor
The real part of (a) is a zero-sequence voltage amplitude, the zero-sequence voltage phasor
The calculation formula of (a) is as follows:
wherein U isA∠0°、UB∠120°、UCThe angle 240 degrees respectively represents A, B, C three-phase voltage.
4. The method as claimed in claim 1, wherein in step S4, if the unbalance of the three-phase voltages is within the balance rangeIf the proportion of the data group is larger than the balance judgment threshold value, the three-phase voltage of the distribution transformer is considered to be balanced, otherwise, the three-phase voltage is unbalanced; the calculation formula of the three-phase voltage unbalance epsilon is as follows: e ═ U0/220，U0Is the zero sequence voltage amplitude.
5. The method as claimed in claim 1, wherein in step S5, a Pearson correlation coefficient r between the zero-sequence voltage and the zero-sequence current is calculated, and if | r | is greater than the correlation determination threshold, it indicates that the zero-sequence voltage and the zero-sequence current have strong correlation; the calculation formula of the Pearson correlation coefficient r is as follows:
wherein, I0,iAnd U0,iAnd respectively representing the zero sequence current and the corresponding zero sequence voltage amplitude of the ith data set, wherein n is the total number of the data sets.
6. The method for studying and judging the connection abnormality of the neutral point of the distribution transformer according to claim 4 or 5, wherein the balance interval is [0, 2% ], and the balance judgment threshold is 90%; the correlation determination threshold value is 0.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210299999.9A CN114675212B (en) | 2022-03-25 | 2022-03-25 | Method for studying and judging abnormal connection of neutral point of distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210299999.9A CN114675212B (en) | 2022-03-25 | 2022-03-25 | Method for studying and judging abnormal connection of neutral point of distribution transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114675212A true CN114675212A (en) | 2022-06-28 |
| CN114675212B CN114675212B (en) | 2024-06-04 |
Family
ID=82074333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210299999.9A Active CN114675212B (en) | 2022-03-25 | 2022-03-25 | Method for studying and judging abnormal connection of neutral point of distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114675212B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117471366A (en) * | 2023-12-27 | 2024-01-30 | 国网福建省电力有限公司 | Metering device neutral line contact failure studying and judging method based on least square method |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2733498A2 (en) * | 2012-11-15 | 2014-05-21 | Schneider Electric Industries SAS | Method and device for detecting directional grounding fault based on three phase current variation |
| US20140309952A1 (en) * | 2013-04-12 | 2014-10-16 | Mitsubishi Electric Research Laboratories, Inc. | Method for Analyzing Faults in Ungrounded Power Distribution Systems |
| CN104730410A (en) * | 2015-03-16 | 2015-06-24 | 王金泽 | Distribution line breakage monitoring method and device based on voltage and current vectors |
| CN106124936A (en) * | 2016-07-29 | 2016-11-16 | 国电南瑞科技股份有限公司 | A kind of Distributed power net method for locating single-phase ground fault |
| CN106443292A (en) * | 2016-01-21 | 2017-02-22 | 张家港智电电工高技术研究所有限公司 | Overhead line single-phase earth fault detection method based on zero sequence current measurement |
| CN108120897A (en) * | 2017-12-14 | 2018-06-05 | 国网安徽省电力有限公司蚌埠供电公司 | A kind of distribution single-phase grounding selecting method based on three-phase current unbalance degree computation model |
| US20190181774A1 (en) * | 2017-12-08 | 2019-06-13 | Delta Electronics (Shanghai) Co.,Ltd. | Three-level circuit and control method for balancing neutral point voltage of the same |
| WO2019229638A1 (en) * | 2018-05-31 | 2019-12-05 | Abb Schweiz Ag | Fault location for parallel transmission lines with zero sequence currents estimated from faulted line measurements |
| CN110718908A (en) * | 2019-09-29 | 2020-01-21 | 肖家锴 | Hierarchical clustering method-based distribution network topological structure identification method and system |
| US20200083702A1 (en) * | 2017-07-06 | 2020-03-12 | Changsha University Of Science And Technology | Safe processing method for active voltage reduction of ground fault phase of non-effective ground system |
| CN111965475A (en) * | 2020-06-05 | 2020-11-20 | 国电南瑞南京控制***有限公司 | Zero-sequence current distribution characteristic-based comprehensive fault studying and judging method for power distribution network |
| CN112098772A (en) * | 2020-08-17 | 2020-12-18 | 国网安徽省电力有限公司铜陵供电公司 | Power distribution network line-variable relation abnormity identification and determination method |
| CN112119556A (en) * | 2018-05-18 | 2020-12-22 | Abb瑞士股份有限公司 | Method and apparatus for use in ground fault protection |
| CN112379218A (en) * | 2020-11-27 | 2021-02-19 | 云南电网有限责任公司昆明供电局 | Neutral line disconnection judging method based on three-phase voltage unbalance degree |
| CN113740773A (en) * | 2021-09-09 | 2021-12-03 | 中广核研究院有限公司 | Transformer open-phase fault detection method and system, computer equipment and storage medium |
-
2022
- 2022-03-25 CN CN202210299999.9A patent/CN114675212B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2733498A2 (en) * | 2012-11-15 | 2014-05-21 | Schneider Electric Industries SAS | Method and device for detecting directional grounding fault based on three phase current variation |
| US20140309952A1 (en) * | 2013-04-12 | 2014-10-16 | Mitsubishi Electric Research Laboratories, Inc. | Method for Analyzing Faults in Ungrounded Power Distribution Systems |
| CN104730410A (en) * | 2015-03-16 | 2015-06-24 | 王金泽 | Distribution line breakage monitoring method and device based on voltage and current vectors |
| CN106443292A (en) * | 2016-01-21 | 2017-02-22 | 张家港智电电工高技术研究所有限公司 | Overhead line single-phase earth fault detection method based on zero sequence current measurement |
| CN106124936A (en) * | 2016-07-29 | 2016-11-16 | 国电南瑞科技股份有限公司 | A kind of Distributed power net method for locating single-phase ground fault |
| US20200083702A1 (en) * | 2017-07-06 | 2020-03-12 | Changsha University Of Science And Technology | Safe processing method for active voltage reduction of ground fault phase of non-effective ground system |
| US20190181774A1 (en) * | 2017-12-08 | 2019-06-13 | Delta Electronics (Shanghai) Co.,Ltd. | Three-level circuit and control method for balancing neutral point voltage of the same |
| CN108120897A (en) * | 2017-12-14 | 2018-06-05 | 国网安徽省电力有限公司蚌埠供电公司 | A kind of distribution single-phase grounding selecting method based on three-phase current unbalance degree computation model |
| CN112119556A (en) * | 2018-05-18 | 2020-12-22 | Abb瑞士股份有限公司 | Method and apparatus for use in ground fault protection |
| WO2019229638A1 (en) * | 2018-05-31 | 2019-12-05 | Abb Schweiz Ag | Fault location for parallel transmission lines with zero sequence currents estimated from faulted line measurements |
| CN110718908A (en) * | 2019-09-29 | 2020-01-21 | 肖家锴 | Hierarchical clustering method-based distribution network topological structure identification method and system |
| CN111965475A (en) * | 2020-06-05 | 2020-11-20 | 国电南瑞南京控制***有限公司 | Zero-sequence current distribution characteristic-based comprehensive fault studying and judging method for power distribution network |
| CN112098772A (en) * | 2020-08-17 | 2020-12-18 | 国网安徽省电力有限公司铜陵供电公司 | Power distribution network line-variable relation abnormity identification and determination method |
| CN112379218A (en) * | 2020-11-27 | 2021-02-19 | 云南电网有限责任公司昆明供电局 | Neutral line disconnection judging method based on three-phase voltage unbalance degree |
| CN113740773A (en) * | 2021-09-09 | 2021-12-03 | 中广核研究院有限公司 | Transformer open-phase fault detection method and system, computer equipment and storage medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117471366A (en) * | 2023-12-27 | 2024-01-30 | 国网福建省电力有限公司 | Metering device neutral line contact failure studying and judging method based on least square method |
| CN117471366B (en) * | 2023-12-27 | 2024-04-09 | 国网福建省电力有限公司 | Metering device neutral line contact failure studying and judging method based on least square method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114675212B (en) | 2024-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114994441B (en) | Intelligent electric power efficiency monitoring device | |
| CN105486917B (en) | A kind of energy-saving transmission line losses and fault detection method | |
| CN111257820B (en) | Three-phase intelligent electric meter wiring remote detection method | |
| CN113205260A (en) | Electric automobile charging pile health state assessment method based on digital twins | |
| CN113189420B (en) | Power distribution detection device for data center | |
| CN114675212A (en) | Method for studying and judging abnormal connection of neutral point of distribution transformer | |
| CN109919495A (en) | Photovoltaic plant monitoring data exception and degree judgment method based on threshold calculations | |
| CN109038574A (en) | A kind of calculation method of the series-parallel mismatch loss of the group of photovoltaic plant | |
| CN117131321A (en) | Electric energy data acquisition method | |
| CN111999695B (en) | State evaluation and abnormity diagnosis method for metering device of transformer substation | |
| CN105486980B (en) | A kind of power transmission line energy-saving safety operating system | |
| CN114414940A (en) | Fault judgment method based on basic data of electricity utilization information acquisition system | |
| WO2024104037A1 (en) | Direct-current arc detection method based on mathematical morphology and mode recognition | |
| CN113376553A (en) | Intelligent discrimination method and system for three-phase four-wire metering string current loop wiring | |
| CN109784777B (en) | Power grid equipment state evaluation method based on time sequence information fragment cloud similarity measurement | |
| CN113126017A (en) | Fault diagnosis method for data acquisition failure in electric energy acquisition system | |
| CN116106627A (en) | Judgment method based on miswiring abnormality of different phases of voltage and current | |
| CN114325555A (en) | Metering equipment abnormity on-line monitoring model and error calculation method | |
| CN114152909A (en) | Medium-high voltage misalignment analysis system based on big data | |
| CN113436030A (en) | Multi-dimensional monitoring method and system for power distribution network | |
| CN109782064B (en) | Wind power plant output impedance frequency characteristic test analysis method | |
| CN112529395A (en) | Power transmission line typical ice wind disaster analysis method based on fusion of FCE and SVM | |
| CN105548750B (en) | Substation's electric current secondary loop state evaluating method based on more data processings | |
| CN117471366B (en) | Metering device neutral line contact failure studying and judging method based on least square method | |
| CN105629050B (en) | A kind of energy-saving transmission line losses and failure monitoring device |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |