CN101806841A - Method for determining test parameter of winding and sleeve of power transformer - Google Patents
Method for determining test parameter of winding and sleeve of power transformer Download PDFInfo
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- CN101806841A CN101806841A CN200910312639A CN200910312639A CN101806841A CN 101806841 A CN101806841 A CN 101806841A CN 200910312639 A CN200910312639 A CN 200910312639A CN 200910312639 A CN200910312639 A CN 200910312639A CN 101806841 A CN101806841 A CN 101806841A
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Abstract
The invention discloses a method for determining test parameters of a winding and a sleeve of a power transformer. The method comprises the following steps of: obtaining a capacitive reactive power component by utilizing data obtained by the design, the manufacturing and the routine tests of the transformer through using a multiple-step integral method; establishing a physical model matched with a practical situation in consideration of counteraction effects of inductive reactive power to the capacitive reactive power component in the state of each test and the variation of an active power component of each test state, and finally forming a computer model, calculating an optimum frequency of each process according to the principle of complete reactive power compensation and calculating the active power component of each time period; converting each component into test parameters, such as actual current, voltage, power, efficiency and the like and constructing a run chart of various variables. The invention has the advantages of controlling an error range between a calculated value and an actual value within 1%, providing the actual guide value for the tests, avoiding mis-operations and illegal operations and ensuring the safety of test equipment and the tested transformer.
Description
Technical field
The present invention relates to a kind of implementation method of large and medium-sized power transformer High-Voltage Experimentation Technology, especially relate to and utilize variable-frequency power sources to carry out " induced voltage and measurement of partial discharge when winding and sleeve of power transformer is long " method for determining test parameter.
Background technology
In accordance with regulations, large and medium-sized power transformer is after preceding, the overhaul of putting into operation and behind the insulation fault, for whether check transformer primary element exists insulation defect, whether dielectric level meets the requirement of regulation and producer's technical conditions of related standards, must carry out winding and sleeve induced voltage and measurement of partial discharge when long, find the defective of transformer manufacturing, installation and maintenance technology timely and effectively.
Because when induced voltage and measurement of partial discharge, existing real component also has idle component to large and medium-sized power transformer, and existing capacitive component in the idle component, perceptual weight is also arranged, but idle component totally presents capacitive component when winding and sleeve is long.
Along with reaching its maturity of Power Electronic Technique, induced voltage and measurement of partial discharge adopted converter plant as experiment power supply more and more widely when the winding and sleeve of power transformer was long.Advantages such as variable-frequency power sources has that starting current is little, the rate of rise is fast, do not have mechanical moving component, self partial discharge quantity is little, but its power is less, the most about 500kVA.Generally, the frequency conversion experiment power supply all must adopt reactor to carry out the compensation of capacitive reactive power, and nonetheless, to the test of super-huge, superhigh tension power transformer the time, if parameter matching is unreasonable, the variable-frequency power sources output power can not meet the demands.
Constitute the test loop by large and medium-sized power transformer (test specimen), testing transformer, compensation reactor, experiment power supply, voltage divider unit etc., make total comparatively complicated, particularly tested transformer differs from operating condition under test condition, frequency, voltage, three-phase symmetry neither with, cause its real component, perceptual idle component, capacitive reactive power component to change, physical model is difficult for setting up, test parameterss such as basic electric current by each parts in the experience estimation loop, voltage, frequency, test parameters and actual amount often have big large deviation.
Generally, connect test apparatus and test specimen by testing crew after, the examination up voltage if test parameters has than large deviation with estimated value, has to stop test, must adjust testing equipment, repeated multiple times like this.Since GB50150-2006 " electric device installation work electrical equipment commissioning test standard " to winding and sleeve of power transformer when long induced voltage and measurement of partial discharge be divided into I, II, III, IV, 5 time periods of V and carry out, the pressing time in each stage and magnitude of voltage all have very strict requirement, 5 pressure periods closely link to each other, must disposable finishing, the centre must not be interrupted, adjust testing equipment, will cause tested transformer to be pressurizeed repeatedly, bear the high voltage that not should bear and long pressing time, reduce its dielectric level.Because I, II, III, IV, V 5 stages apply voltage, frequency has nothing in common with each other, there is not direct derivation relation in each time period parameter, and have than big-difference, can not be with the derive parameter of next time of parameter of last pressing time of section, even the change of the interior a certain parameter of section will cause the rapid variation of all parameters at one time, adjusting several nothings in the on-the-spot short time may, particularly when the III section, will reach the highest trial voltage (the superhigh tension power transformer trial voltage is about 540kV), the longest 60s of time, the shortest only 24s.At this moment, if there is not the accurate Calculation parameter, the test operation personnel are under high-strung situation, cannot observe a plurality of table meters simultaneously at all, adjust testing equipment again, the harm that excessive parameter error brings will be directly to damage to be worth millions of units and to be and the voltage transformer of tens million of units, and the accident that high-potting is damaged transformer often has generation, widely influence send out, transmission of electricity.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of definite method of test parameter of winding and sleeve of power transformer, before induced voltage and measurement of partial discharge are tested when winding and sleeve is long, can accurately calculate each test parameters in advance, testing crew when carrying out, is only operated by this method established data as required in test, and needn't adjust testing equipment repeatedly, each pressure period comprises that the pilot process between the stage accomplishs without any letup, and electric capacity idle component and inductance idle component offset all the time, tested transformer is in best compensating coefficient always, the electric current that only is real component passes through variable-frequency power sources, improve the serviceable life of variable-frequency power sources, and available frequency conversion is carried out super-huge, the superhigh tension power transformer test.
The technical solution adopted for the present invention to solve the technical problems is: a kind of definite method of test parameter of winding and sleeve of power transformer comprises the steps:
The first step, collect tested power transformer technical data, as electric pressure, connect group, each winding over the ground and each other electric capacity, open circuit loss value etc.;
Second goes on foot, utilizes the technical data of tested power transformer, the capacitive reactive power of the tested transformer of deriving and lagging reactive power:
A, use integration by parts,, calculate the capacitive reactive power component of high pressure winding the distributed electrical capacity and the voltage step integration of high pressure winding:
Middle capacitive reactive power component of pressing winding:
The capacitive reactive power component of low pressure winding:
All idle components are converted to the capacitive reactive power component of low pressure winding: Q
Electric capacity=Q
High pressure+ Q
The middle pressure+ Q
Low pressure
B, draw the magnetization curve formula of tested transformer silicon steel sheet, be converted to the lagging reactive power of each pressure period with the parabolic curve fitting process;
The 3rd goes on foot, determines each pressure period testing requirements value, selects the mode of connection of testing equipment;
The 4th goes on foot, sets up tested transformer and testing equipment physical model: under the mode of connection of determining, capacitive reactive power with tested transformer, lagging reactive power, the lagging reactive power of compensation reactor, parameter integrations such as the power that the power that step-up transformer provides, efficient, gear, variable-frequency power sources provide, efficient are in same equivalent electrical circuit;
The 5th step, set up computer model: utilize ATPdraw software, physical model is integrated tested characteristic of transformer parameter in the equivalent electrical circuit obtain, measurement voltage divider lumped parameter electric capacity is idle, step-up transformer characteristic parameter and variable-frequency power sources characteristic parameter are plotted in the template of ATPdraw software based on physical model;
The 6th step, basis be the principle Q of reactive power compensation fully
Electric capacity=Q
Inductance+ Q
Compensation, calculate each process " optimum frequency ";
The 7th step, utilization " optimum frequency " calculate each time period real component;
The 8th step, each component is converted to test parameterss such as actual " electric current ", " voltage ", " power ", " efficient ", makes each variable trend graph.
Compared with prior art, good effect of the present invention is: the data that the present invention obtains when utilizing design of transformer, manufacturing, conventional test, adopt integration by parts, each winding of tested transformer is arrived low-pressure side by the electric capacity distribution and the method reduction of voltage distribution integration, draw the capacitive reactive power component; Consider that perception is idle to the negative function of the asexual component of capacitive and the variation of each trystate real component under each trystate, set up the physical model that matches with actual conditions, the final computer model that forms, induced voltage and measurement of partial discharge are tested each pressure period in the time of can precomputing range transformer winding and sleeve length, the voltage of high-tension testing apparatus and test specimen various piece point, electric current, frequency, meritorious, reactive power and component, make each variable trend graph, the error range of calculated value and actual value is controlled in 1%.For test provides actual standard, avoid maloperation and violation operation, ensure the safety of testing equipment and tested transformer.
The present invention has overcome the blindness that the traditional experiment parameter relies on the experimental formula of personal experience and no physics meaning to estimate, time in the time of satisfying the carrying out that GB50150-2006 " electric device installation work electrical equipment commissioning test standard " requires " Transformer Winding is induced voltage and measurement of partial discharge during together with the cover pipe range ", voltage and measurement continuity, calculation method of parameters when utilizing variable-frequency power sources to carry out " Transformer Winding is induced voltage and measurement of partial discharge during together with the cover pipe range " based on physical model and computer model establishment a kind of general is applicable to 110kV and above all types of power transformer.
Embodiment
Disclosed all features in this instructions, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
A kind of definite method of test parameter of winding and sleeve of power transformer comprises the steps:
The first step, collect tested power transformer technical data, as electric pressure, connect group, each winding over the ground and each other electric capacity, open circuit loss value etc.;
Second goes on foot, utilizes the technical data of tested power transformer, the capacitive reactive power of the tested transformer of deriving and lagging reactive power:
A, use integration by parts,, calculate the capacitive reactive power component of high pressure winding the distributed electrical capacity and the voltage step integration of high pressure winding:
Simplify promptly
In like manner,
Again because U
Test phase study voltage=2U
Non-test phase study voltage,
So
In like manner, the capacitive reactive power component of middle pressure winding:
The capacitive reactive power component of low pressure winding:
All idle components are converted to the capacitive reactive power component of low pressure winding, promptly
Q
Electric capacity=Q
High pressure+ Q
The middle pressure+ Q
Low pressure
B, draw the magnetization curve formula of tested transformer silicon steel sheet, be converted to the lagging reactive power of each pressure period with the parabolic curve fitting process:
Because curve is the decision of siliconized plate characteristic, the siliconized plate of different steel mills, the different trades mark has different magnetization curves, so each magnetization curve all needs to carry out match.Concrete grammar is: limited a plurality of numerical value on the trade-off curve, carry out parabolic interpolation with the QBasic written program, and just can obtain the fitting formula of curve easily, the interpolation point on the trade-off curve is many more, and the formula that obtains is accurate more.
Convert by following formula, obtain the lagging reactive power of each pressure period:
I
No-load current under the tested transformer rated voltageAnd P
Tested transformer nominal lossIn test figure routinely, obtain; For example, under 1.5 trial voltages,
The 3rd goes on foot, determines each pressure period testing requirements value, selects the mode of connection of testing equipment;
The 4th goes on foot, sets up tested transformer and testing equipment physical model:
Under the mode of connection of determining, with the capacitive reactive power of tested transformer, lagging reactive power, the lagging reactive power of compensation reactor, parameter integrations such as the power that the power that step-up transformer provides, efficient, gear, variable-frequency power sources provide, efficient are in same equivalent electrical circuit;
The 5th step, set up computer model: utilize ATPdraw software (world electrician association provides disclosed, free circuit software for calculation), physical model is integrated tested characteristic of transformer parameter in the equivalent electrical circuit obtain, measurement voltage divider lumped parameter electric capacity is idle, step-up transformer characteristic parameter and variable-frequency power sources characteristic parameter are plotted in the template of ATPdraw software based on physical model;
The 6th step, the principle of pressing complete reactive power compensation calculate each process " optimum frequency ":
Under the different tests state, frequency changes, the one group of frequency that changes that is provided by variable-frequency power sources is provided " optimum frequency ", by change frequency make tested transformer, compensation reactor lagging reactive power vector and, all the time equal tested transformer, measure voltage divider the capacity reactive power vector and, variable-frequency power sources also only provides active power all the time like this, the minimum of exerting oneself, just " optimum frequency " of whole equivalent electrical circuit.The principle of " optimum frequency " is Q
Electric capacity=Q
Inductance+ Q
Compensation, promptly
In the following formula
" optimum frequency "
Wherein
Also be with
Be correlated with, the magnetization curve fitting formula by siliconized plate obtains a variable.For this equation of higher order, to utilize ATPdraw software frequency to carry out test run and calculate, the frequency step maximum should be made as 0.1Hz;
The 7th step, utilization " optimum frequency " calculate each time period real component, and concrete computing method are: P
Meritorious=P
The test phase+ 2P
Non-test phase
In like manner,
Wherein k is the multiple of tested transformer test voltage and rating operating voltage, P
The specified active loss of tested transformerCan in tested Transformer Plant Test data, find;
The 8th step, each component is converted to test parameterss such as actual " electric current ", " voltage ", " power ", " efficient ", makes each variable trend graph:
A, each pressure period lagging reactive power of known tested transformer, capacitive reactive power, frequency, trial voltage just can obtain test current;
B, known pressure period compensation reactor inductance value, voltage, frequency just can calculate test current;
C, known step-up transformer gear, the voltage of pressure period, frequency just can calculate test current, efficient;
D, the output of known variable-frequency power sources only provide active power under " optimum frequency ", variable-frequency power sources output voltage, electric current equate with step-up transformer low-pressure side input voltage, electric current, just can calculate variable-frequency power sources output power, efficient and required input three-phase current size.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (1)
1. definite method of a test parameter of winding and sleeve of power transformer is characterized in that: comprise the steps:
The first step, collect tested power transformer technical data, as electric pressure, connect group, each winding over the ground and each other electric capacity, open circuit loss value etc.;
Second goes on foot, utilizes the technical data of tested power transformer, the capacitive reactive power of the tested transformer of deriving and lagging reactive power:
A, use integration by parts,, calculate the capacitive reactive power component of high pressure winding the distributed electrical capacity and the voltage step integration of high pressure winding:
Middle capacitive reactive power component of pressing winding:
The capacitive reactive power component of low pressure winding:
All idle components are converted to the capacitive reactive power component of low pressure winding: Q
Electric capacity=Q
High pressure+ Q
The middle pressure+ Q
Low pressure
B, draw the magnetization curve formula of tested transformer silicon steel sheet, be converted to the lagging reactive power of each pressure period with the parabolic curve fitting process;
The 3rd goes on foot, determines each pressure period testing requirements value, selects the mode of connection of testing equipment;
The 4th goes on foot, sets up tested transformer and testing equipment physical model: under the mode of connection of determining, capacitive reactive power with tested transformer, lagging reactive power, the lagging reactive power of compensation reactor, parameter integrations such as the power that the power that step-up transformer provides, efficient, gear, variable-frequency power sources provide, efficient are in same equivalent electrical circuit;
The 5th step, set up computer model: utilize ATPdraw software, physical model is integrated tested characteristic of transformer parameter in the equivalent electrical circuit obtain, measurement voltage divider lumped parameter electric capacity is idle, step-up transformer characteristic parameter and variable-frequency power sources characteristic parameter are plotted in the template of ATPdraw software based on physical model;
The 6th step, basis be the principle Q of reactive power compensation fully
Electric capacity=Q
Inductance+ Q
Compensation, calculate each process " optimum frequency ";
The 7th step, utilization " optimum frequency " calculate each time period real component;
The 8th step, each component is converted to test parameterss such as actual " electric current ", " voltage ", " power ", " efficient ", makes each variable trend graph.
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| CN2009103126392A CN101806841B (en) | 2009-12-30 | 2009-12-30 | Method for determining test parameter of winding and sleeve of power transformer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735959A (en) * | 2012-05-29 | 2012-10-17 | 辽宁省电力有限公司 | On-line ultrahigh-voltage line power transformer test method |
| CN103454536A (en) * | 2013-09-16 | 2013-12-18 | 国网河南省电力公司焦作供电公司 | Power transformer test method |
| CN103543361A (en) * | 2013-10-31 | 2014-01-29 | 国家电网公司 | Frequency-conversion voltage-regulation on-site no-load test method for large extra-high voltage transformer |
| CN104267298A (en) * | 2014-10-23 | 2015-01-07 | 上海银都节能服务有限公司 | Method for calculating parameters of duplex winding power transformer |
| CN110568330A (en) * | 2019-09-16 | 2019-12-13 | 国网河北省电力有限公司电力科学研究院 | Three-phase three-winding transformer induction voltage band partial discharge test parameter estimation method |
| CN113687154A (en) * | 2021-08-05 | 2021-11-23 | 南方电网科学研究院有限责任公司 | Method, device and equipment for monitoring no-load running state of transformer and storage medium |
-
2009
- 2009-12-30 CN CN2009103126392A patent/CN101806841B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735959A (en) * | 2012-05-29 | 2012-10-17 | 辽宁省电力有限公司 | On-line ultrahigh-voltage line power transformer test method |
| CN103454536A (en) * | 2013-09-16 | 2013-12-18 | 国网河南省电力公司焦作供电公司 | Power transformer test method |
| CN103543361A (en) * | 2013-10-31 | 2014-01-29 | 国家电网公司 | Frequency-conversion voltage-regulation on-site no-load test method for large extra-high voltage transformer |
| CN103543361B (en) * | 2013-10-31 | 2016-04-06 | 国家电网公司 | The extra-high voltage field for Large Transformer no-load test method of frequency conversion voltage adjusting |
| CN104267298A (en) * | 2014-10-23 | 2015-01-07 | 上海银都节能服务有限公司 | Method for calculating parameters of duplex winding power transformer |
| CN104267298B (en) * | 2014-10-23 | 2017-11-24 | 上海华群实业股份有限公司 | A kind of calculation method of parameters of double winding power transformer |
| CN110568330A (en) * | 2019-09-16 | 2019-12-13 | 国网河北省电力有限公司电力科学研究院 | Three-phase three-winding transformer induction voltage band partial discharge test parameter estimation method |
| CN113687154A (en) * | 2021-08-05 | 2021-11-23 | 南方电网科学研究院有限责任公司 | Method, device and equipment for monitoring no-load running state of transformer and storage medium |
| CN113687154B (en) * | 2021-08-05 | 2024-01-26 | 南方电网科学研究院有限责任公司 | No-load operation state monitoring method, device and equipment of transformer and storage medium |
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Inventor after: Wang Xianxiu Inventor after: Zhu Tianyu Inventor after: Jiang Xuping Inventor after: Tan Ping Inventor after: Ding Tao Inventor after: Yang Guang Inventor before: Wang Xianxiu Inventor before: Wang Zhiyong Inventor before: Jiang Xuping Inventor before: Tan Ping Inventor before: Ding Tao Inventor before: Yang Guang |
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