CN108631304A - Distribution transformer low-pressure side voltage three-phase imbalance appraisal procedure based on aggregative weighted - Google Patents
Distribution transformer low-pressure side voltage three-phase imbalance appraisal procedure based on aggregative weighted Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The present invention discloses a kind of distribution transformer low-pressure side voltage three-phase imbalance appraisal procedure based on aggregative weighted, including：Establish real-time maximum voltage three-phase imbalance rateRMAVTo record the real-time maximum uneven situation of low-pressure side three-phase voltage；Establish real-time minimum voltage three-phase imbalance rateRMNVTo record the real-time minimum uneven situation of low-pressure side three-phase voltage；Establish real-time mean voltage three-phase imbalance rateRMDVTo record the real-time intermediate value imbalance situation of low-pressure side three-phase voltage；Establish real-time average voltage three-phase imbalance rateRAVVTo record the real-time average uneven situation of low-pressure side three-phase voltage；Establish real time comprehensive weighted voltage three-phase imbalance rateRALVTo record the real time comprehensive imbalance situation of low-pressure side three-phase voltage；According to real time comprehensive weighted voltage three-phase imbalance rateRALVWith imbalance of three-phase voltage rate limit valueRVVLOverall merit low-pressure side voltage three-phase imbalance situation.The appraisal procedure can effectively reflect low-pressure side imbalance of three-phase voltage situation.
Description
Technical Field
The invention relates to the field of power quality of a power distribution network, in particular to a comprehensive weighting-based method for evaluating three-phase imbalance of voltage at a low-voltage side of a distribution transformer.
Background
At present, along with rapid development of economy, a large number of high-tech industrial parks are put into operation, the scientific and technological parks rely on high-precision automatic control equipment to realize production and manufacturing of products, along with large application of high-precision electronic products, the problem of power quality becomes more and more concerned by people, sudden drop or sudden rise of voltage, unbalance of three-phase voltage, harmonic distortion and the like can all cause shutdown of high-precision electronic production equipment, production safety is endangered, and great economic loss and social influence are caused.
Meanwhile, high-quality power supply is also an important mark of a first-class power distribution network, so that the analysis of the power quality of outgoing lines of a transformer substation, an important switching station, an important transformer area and important users is realized, weak links of a power grid are found through comprehensive analysis of unbalance of three-phase voltage of the low-voltage side of a distribution transformer, a feasible maintenance strategy is provided, and the method has important practical significance.
Disclosure of Invention
The invention aims to solve the problem of evaluation of three-phase voltage unbalance of the low-voltage side of a distribution transformer, and provides a comprehensive weighting-based evaluation method for the three-phase voltage unbalance of the low-voltage side of the distribution transformer by combining the characteristics of a power distribution network.
The technical scheme for realizing the purpose is as follows:
a comprehensive weighting-based distribution transformer low-voltage side voltage three-phase imbalance assessment method comprises the following steps:
(1) establishing a real-time maximum voltage three-phase imbalance rateRMAVRecording the real-time maximum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(2) establishing a real-time minimum voltage three-phase imbalance rateRMNVRecording the real-time minimum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(3) establishing in real timeThree-phase unbalance rate of value voltageRMDVRecording the real-time medium value unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(4) establishing real-time average voltage three-phase imbalance rateRAVVRecording the real-time average unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(5) establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVRecording the real-time comprehensive unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(6) according to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLAnd comprehensively evaluating the three-phase imbalance condition of the voltage at the low-voltage side of the distribution transformer.
Establishing a real-time maximum voltage three-phase imbalance rateRMAVWith the real-time biggest unbalanced condition of the three-phase voltage of record distribution transformer low pressure side, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min the smallest real-time voltage value of the three-phase voltages of the low-voltage side A, B, C of the distribution transformer. Provision forV max AndV min at the same time, when the value is 0,RMAVis 0;V min is 0 andV max when the average molecular weight is not 0, the average molecular weight,RMAVis-1.
Establishing a real-time minimum voltage three-phase imbalance rateRMNVWith the real-time minimum unbalanced condition of recording distribution transformer low pressure side three-phase voltage specifically does:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min the smallest real-time voltage value of the three-phase voltages of the low-voltage side A, B, C of the distribution transformer. Provision forV max AndV min at the same time, when the value is 0,RMNVis 0.
Establishing real-time medium voltage three-phase unbalance rateRMDVWith the real-time median unbalanced condition of recording distribution transformer low pressure side three-phase voltage, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,V mid the real-time voltage value centered in the three-phase voltage of the distribution transformer low-voltage side A, B, C. Provision forV max AndV mid at the same time, when the value is 0,RMDVis 0;V mid is 0 andV max when the average molecular weight is not 0, the average molecular weight,RMDVis-1.
Establishing real-time average voltage three-phase imbalance rateRAVVWith the real-time average unbalanced condition of recording distribution transformer low pressure side three-phase voltage, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,V a 、V b 、V c respectively, real-time voltage values for the A, B, C three phases on the low side of the distribution transformer. Provision forV max AndV min at the same time, when the value is 0,RAVVis 0.
Establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVWith the real-time comprehensive unbalanced condition of the three-phase voltage of record distribution transformer low pressure side, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,α 1is composed ofRMAVThe weight coefficient is in the value range of [0.35, 0.45 ]]，α 2Is composed ofRMNTThe weight coefficient is in the range of [0.25, 0.35 ]]，α 3Is composed ofRMDVThe weight coefficient is in the value range of [0.15, 0.25 ]]，α 4Is composed ofRAVVThe weight coefficient is in the value range of [0.05, 0.15%]. Provision forV max Is not 0 butV mid When the average molecular weight is 0, the average molecular weight,RALVis-1;V max is not limited to Is composed of0 butV min When the average molecular weight is 0, the average molecular weight,RALVis-1.
According to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLThe comprehensive evaluation distribution transformer low-voltage side voltage three-phase unbalance condition specifically includes:
(1) if the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVGreater than or equal to the three-phase voltage unbalance rate limit valueRVVLIt indicates that the three-phase voltage on the low-voltage side of the distribution transformer is seriously unbalanced and the unbalance degree isRALV。
(2) If the real-time integrated weighted voltage of a distribution transformer is threeRate of phase imbalanceRALVLess than the limit value of the unbalance rate of the three-phase voltageRVVLAnd if the voltage is not-1, the low-voltage side three-phase voltage of the distribution transformer is in a balanced state.
(3) If the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVAnd the value is-1, indicating that the low-voltage side of the distribution transformer has the possibility of wire breakage.
The invention has the beneficial technical effects that: establishing a real-time maximum voltage three-phase imbalance rateRMAVRecording the real-time maximum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer; establishing a real-time minimum voltage three-phase imbalance rateRMNVRecording the real-time minimum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer; establishing real-time medium voltage three-phase unbalance rateRMDVRecording the real-time medium value unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer; establishing real-time average voltage three-phase imbalance rateRAVVRecording the real-time average unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer; establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVRecording the real-time comprehensive unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer; according to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLAnd comprehensively evaluating the three-phase imbalance condition of the voltage at the low-voltage side of the distribution transformer. The evaluation method can effectively reflect the unbalanced condition of the three-phase voltage at the low-voltage side of the distribution transformer and has good practical value.
Drawings
Figure 1 is a diagram of a typical power distribution network.
Detailed Description
The present invention is explained in detail below:
(1) establishing a real-time maximum voltage three-phase imbalance rateRMAVTo record the three-phase electricity at the low-voltage side of the distribution transformerA real-time maximum imbalance condition of pressure;
(2) establishing a real-time minimum voltage three-phase imbalance rateRMNVRecording the real-time minimum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(3) establishing real-time medium voltage three-phase unbalance rateRMDVRecording the real-time medium value unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(4) establishing real-time average voltage three-phase imbalance rateRAVVRecording the real-time average unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(5) establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVRecording the real-time comprehensive unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(6) according to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLAnd comprehensively evaluating the three-phase imbalance condition of the voltage at the low-voltage side of the distribution transformer.
Establishing a real-time maximum voltage three-phase imbalance rateRMAVWith the real-time biggest unbalanced condition of the three-phase voltage of record distribution transformer low pressure side, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min the smallest real-time voltage value of the three-phase voltages of the low-voltage side A, B, C of the distribution transformer. Provision forV max AndV min at the same time, when the value is 0,RMAVis 0;V min is 0 andV max when the average molecular weight is not 0, the average molecular weight,RMAVis-1.
Establishing a real-time minimum voltage three-phase imbalance rateRMNVTo record power distributionThe real-time minimum unbalanced condition of transformer low pressure side three-phase voltage specifically is:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min the smallest real-time voltage value of the three-phase voltages of the low-voltage side A, B, C of the distribution transformer. Provision forV max AndV min at the same time, when the value is 0,RMNVis 0.
Establishing real-time medium voltage three-phase unbalance rateRMDVWith the real-time median unbalanced condition of recording distribution transformer low pressure side three-phase voltage, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,V mid the real-time voltage value centered in the three-phase voltage of the distribution transformer low-voltage side A, B, C. Provision forV max AndV mid at the same time, when the value is 0,RMDVis 0;V mid is 0 andV max when the average molecular weight is not 0, the average molecular weight,RMDVis-1.
Establishing real-time average voltage three-phase imbalance rateRAVVWith the real-time average unbalanced condition of recording distribution transformer low pressure side three-phase voltage, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,V a 、V b 、V c respectively, real-time voltage values for the A, B, C three phases on the low side of the distribution transformer. Provision forV max AndV min at the same time, when the value is 0,RAVVis 0.
Establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVWith the real-time comprehensive unbalanced condition of the three-phase voltage of record distribution transformer low pressure side, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,α 1is composed ofRMAVThe weight coefficient is in the value range of [0.35, 0.45 ]]，α 2Is composed ofRMNTThe weight coefficient is in the range of [0.25, 0.35 ]]，α 3Is composed ofRMDVThe weight coefficient is in the value range of [0.15, 0.25 ]]，α 4Is composed ofRAVVThe weight coefficient is in the value range of [0.05, 0.15%]. Provision forV max Is not 0 butV mid When the average molecular weight is 0, the average molecular weight,RALVis-1;V max is not limited to Is composed of0 butV min When the average molecular weight is 0, the average molecular weight,RALVis-1.
According to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLThe comprehensive evaluation distribution transformer low-voltage side voltage three-phase unbalance condition specifically includes:
(1) if real-time synthesis of a distribution transformerCombined weighted voltage three-phase imbalance rateRALVGreater than or equal to the three-phase voltage unbalance rate limit valueRVVLIt indicates that the three-phase voltage on the low-voltage side of the distribution transformer is seriously unbalanced and the unbalance degree isRALV。
(2) If the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVLess than the limit value of the unbalance rate of the three-phase voltageRVVLAnd if the voltage is not-1, the low-voltage side three-phase voltage of the distribution transformer is in a balanced state.
(3) If the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVAnd the value is-1, indicating that the low-voltage side of the distribution transformer has the possibility of wire breakage.
The specific embodiment is shown in fig. 1, wherein S1 is a substation outlet switch, A, B, C, D is a feeder section switch, DT1, DT2, DT3 and DT4 are distribution transformers, A, B, C three-phase voltages on the low-voltage side of each distribution transformer are shown in table 1, and the three-phase voltage unbalance rate limit value isRVVLWas 0.08.
The low side A, B, C three-phase voltage of DT2 was analyzed as follows:
real-time maximum voltage three-phase imbalance rateRMAVComprises the following steps:
RMAV=(226.5-203.1)/203.1=0.115
real-time minimum voltage three-phase imbalance rateRMNVComprises the following steps:
RMNV=(226.5-203.1)/226.5=0.103
real-time medium voltage three-phase unbalance rateRMDVComprises the following steps:
RMDV=(226.5-203.1)/215.3=0.109
real time average voltage three phase imbalanceRate of changeRAVVComprises the following steps:
RAVV=(226.5-203.1)/214.97=0.109
real-time comprehensive weighted voltage three-phase unbalance rateRALVComprises the following steps:
RALV=0.4×0.115+0.3×0.103+0.2×0.109+0.1×0.109=0.11
according to the limit value of the unbalance rate of the three-phase voltageRVVLThe serious unbalance of the three-phase voltage on the low-voltage side of the distribution transformer can be judged to be 0.08. The three-phase voltage unbalance evaluation methods of other distribution transformers are similar and are not repeated.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (7)
1. A comprehensive weighting-based distribution transformer low-voltage side voltage three-phase imbalance assessment method is characterized by comprising the following steps: the method comprises the following steps:
(1) establishing a real-time maximum voltage three-phase imbalance rateRMAVRecording the real-time maximum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(2) establishing a real-time minimum voltage three-phase imbalance rateRMNVRecording the real-time minimum unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(3) establishing real-time median voltage triphaseRate of equilibriumRMDVRecording the real-time medium value unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(4) establishing real-time average voltage three-phase imbalance rateRAVVRecording the real-time average unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(5) establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVRecording the real-time comprehensive unbalance condition of the three-phase voltage at the low-voltage side of the distribution transformer;
(6) according to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLAnd comprehensively evaluating the three-phase imbalance condition of the voltage at the low-voltage side of the distribution transformer.
2. The method for evaluating the three-phase imbalance of the voltage at the low-voltage side of the distribution transformer based on the comprehensive weighting of the claim 1 is characterized in that:
establishing a real-time maximum voltage three-phase imbalance rateRMAVWith the real-time biggest unbalanced condition of the three-phase voltage of record distribution transformer low pressure side, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min the minimum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer; provision forV max AndV min at the same time, when the value is 0,RMAVis 0;V min is 0 andV max when the average molecular weight is not 0, the average molecular weight,RMAVis-1.
3. The method for evaluating the three-phase imbalance of the voltage at the low-voltage side of the distribution transformer based on the comprehensive weighting of the claim 1 is characterized in that:
establishing a real-time minimum voltage three-phase imbalance rateRMNVTo record the three-phase voltage of the low-voltage side of the distribution transformerThe real-time minimum imbalance condition of (1) is specifically:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min the minimum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer; provision forV max AndV min at the same time, when the value is 0,RMNVis 0.
4. The method for evaluating the three-phase imbalance of the voltage at the low-voltage side of the distribution transformer based on the comprehensive weighting of the claim 1 is characterized in that:
establishing real-time medium voltage three-phase unbalance rateRMDVWith the real-time median unbalanced condition of recording distribution transformer low pressure side three-phase voltage, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,V mid the real-time voltage value centered in the A, B, C three-phase voltage at the low-voltage side of the distribution transformer; provision forV max AndV mid at the same time, when the value is 0,RMDVis 0;V mid is 0 andV max when the average molecular weight is not 0, the average molecular weight,RMDVis-1.
5. The method for evaluating the three-phase imbalance of the voltage at the low-voltage side of the distribution transformer based on the comprehensive weighting of the claim 1 is characterized in that:
establishing real-time average voltage three-phase imbalance rateRAVVTo recordThe real-time average unbalanced condition of distribution transformer low pressure side three-phase voltage specifically is:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,V a 、V b 、V c a, B, C three-phase real-time voltage values of the low-voltage side of the distribution transformer respectively; provision forV max AndV min at the same time, when the value is 0,RAVVis 0.
6. The method for evaluating the three-phase imbalance of the voltage at the low-voltage side of the distribution transformer based on the comprehensive weighting of the claim 1 is characterized in that:
establishing real-time comprehensive weighted voltage three-phase unbalance rateRALVWith the real-time comprehensive unbalanced condition of the three-phase voltage of record distribution transformer low pressure side, specifically do:
wherein,V max the maximum real-time voltage value in the three-phase voltage of the low-voltage side A, B, C of the distribution transformer;V min for the smallest real-time voltage value of the A, B, C three-phase voltages on the low side of the distribution transformer,α 1is composed ofRMAVThe weight coefficient is in the value range of [0.35, 0.45 ]]，α 2Is composed ofRMNTThe weight coefficient is in the range of [0.25, 0.35 ]]，α 3Is composed ofRMDVThe weight coefficient is in the value range of [0.15, 0.25 ]]，α 4Is composed ofRAVVThe weight coefficient is in the value range of [0.05, 0.15%]，V mid The real-time voltage value centered in the A, B, C three-phase voltage at the low-voltage side of the distribution transformer; gaugeStatorV max Is not 0 butV mid When the average molecular weight is 0, the average molecular weight,RALVis-1;V max is not that0 butV min When the average molecular weight is 0, the average molecular weight,RALVis-1.
7. The method for evaluating the three-phase imbalance of the voltage at the low-voltage side of the distribution transformer based on the comprehensive weighting according to any one of the claims 1 to 6, wherein:
according to the real-time comprehensive weighted voltage three-phase unbalance rateRALVAnd three-phase voltage unbalance rate limit valueRVVLThe comprehensive evaluation distribution transformer low-voltage side voltage three-phase unbalance condition specifically includes:
(1) if the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVGreater than or equal to the three-phase voltage unbalance rate limit valueRVVLIt indicates that the three-phase voltage on the low-voltage side of the distribution transformer is seriously unbalanced and the unbalance degree isRALV；
(2) If the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVLess than the limit value of the unbalance rate of the three-phase voltageRVVLAnd if the voltage is not-1, the low-voltage side three-phase voltage of the distribution transformer is in a balanced state;
(3) if the real-time comprehensive weighted voltage three-phase imbalance rate of a certain distribution transformerRALVAnd the value is-1, indicating that the low-voltage side of the distribution transformer has the possibility of wire breakage.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750586A (en) * | 2012-06-06 | 2012-10-24 | 中国电力科学研究院 | Method for assessing operation level and power supply capacity based on large-scale enterprise power supply network |
| CN105591396A (en) * | 2016-02-29 | 2016-05-18 | 国家电网公司 | Low-voltage distribution line distribution transformer three-phase unbalance protection method and device |
| CN105787648A (en) * | 2016-02-19 | 2016-07-20 | 国网浙江省电力公司金华供电公司 | Distribution transformer health state evaluation method based on real-time operation information |
| US20170078117A1 (en) * | 2015-09-11 | 2017-03-16 | Enphase Energy, Inc. | Method and apparatus for channel estimation for three-phase plc systems |
-
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- 2018-05-17 CN CN201810475939.1A patent/CN108631304A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750586A (en) * | 2012-06-06 | 2012-10-24 | 中国电力科学研究院 | Method for assessing operation level and power supply capacity based on large-scale enterprise power supply network |
| US20170078117A1 (en) * | 2015-09-11 | 2017-03-16 | Enphase Energy, Inc. | Method and apparatus for channel estimation for three-phase plc systems |
| CN105787648A (en) * | 2016-02-19 | 2016-07-20 | 国网浙江省电力公司金华供电公司 | Distribution transformer health state evaluation method based on real-time operation information |
| CN105591396A (en) * | 2016-02-29 | 2016-05-18 | 国家电网公司 | Low-voltage distribution line distribution transformer three-phase unbalance protection method and device |
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