CN101701991B - Method for measuring consumption of power capacitor under the condition of multifrequency power supply - Google Patents
Method for measuring consumption of power capacitor under the condition of multifrequency power supply Download PDFInfo
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- CN101701991B CN101701991B CN2009102729602A CN200910272960A CN101701991B CN 101701991 B CN101701991 B CN 101701991B CN 2009102729602 A CN2009102729602 A CN 2009102729602A CN 200910272960 A CN200910272960 A CN 200910272960A CN 101701991 B CN101701991 B CN 101701991B
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Abstract
The invention relates to a method for measuring the consumption of a power capacitor under the condition of a multifrequency power supply, The method equalizes the consumption measurement of the capacitor into the measurement of dissipated heat energy and converts an electrical bridge method which can be influenced by power supply frequency into a method which is free from the influence of the power supply frequency and directly measures the dissipated energy of the capacitor. The method has wide applicability and is suitable for the consumption measurement of the power capacitor, other electrical equipment, the multifrequency power supply and other various power supplies.
Description
Technical field
The present invention relates to might be operated in the loss measurement method of the capacitance apparatus under the multi-frequency Power Supplies Condition as high-voltage parallel capacitor, filter capacitor and other, specifically is the loss measurement method of a kind of power capacitor under the multi-frequency power supply.
Background technology
Loss is an important parameter of power capacitor equipment, and parameter such as the work efficiency of it and equipment, heating situation, insulating property, life-span is closely related.At present, capacitor product all be with dielectric loss angle tangent value (tan δ) as tolerance its loss size parameter.Tan δ equals the ratio of active power and reactive power, and under the constant condition of reactive power, the more little expression active loss of tan δ is more little.
Usually, capacitor all is to adopt bridge method to measure tan δ, promptly carries out the measurement of tan δ by the method for regulating electric bridge four arm impedance ratios.
When capacitor is operated in single-frequency power supply following time, bridge method is effective.Yet when power supply comprises a plurality of frequencies, when having harmonic wave in the power supply, capacitor loops is actually the stack of two or more separate linear systems, and each linear system all has tan δ value separately.Under this condition, measure with electric bridge again and just can not.Because four arm impedance relationships of bridge have been upset, electric bridge can not keep balance simultaneously under a plurality of frequencies.Therefore, common bridge method also just can't be measured tan δ, and, the loss that can not come characterization device this moment with single tan δ value.
In electric system, equipment such as filter capacitor, shnt capacitor all are that long-term work is under industrial frequency superimposed a plurality of harmonic conditions.Especially filter capacitor, the harmonic current value under its design conditions is very big, sometimes even greater than the power current value.At present all be the tan δ value of measuring under the power frequency rated voltage condition, in order to the size of metering condenser loss.And the loss value of equipment all changes along with the variation of frequency, so the tan δ value under the power frequency can not truly reflect the loss situation that contains under the harmonic wave power supply.Therefore, the present invention proposes a kind of condenser loss measuring method under a plurality of supply frequency conditions.
Chinese patent 2008102118511.5 " a kind of dielectric loss on-line measurement apparatus of power capacitor ", utilize Measurement of capacitor case surface temperature and environment temperature to come the active power of calculable capacitor in the method that this device adopts, according to the applied power of capacitance voltage, electric current calculable capacitor, obtain dielectric loss angle with active power divided by tangible power again.Weak point is: (1) method mainly is to be used for on-line monitoring electric capacity, the dielectric loss angle of device under power frequency supply, the physical significance of dielectric loss angle is unintelligible when power supply contains harmonic wave, this method can't record dielectric loss angle accurately, therefore also can't embody the loss situation of capacitor, the scope of application is little; (2) accuracy of the capacitor case surface temperature that records with thermopair of the measured condenser loss result of this method and its has much relations, in capacitor operation heating process, its body temperature everywhere is different, the coefficient of heat transfer of each face also has nothing in common with each other, therefore, accurately the heat dissipation capacity of calculable capacitor need be used imfinitesimal method, computation process is complicated, usually need finish by computing machine or microprocessor, there is test to show, power capacitor when operation maximum temperature difference everywhere can reach more than the 10K, and this method with thermopair be affixed on the capacitor body shell 2/3rds highly the place, represent the temperature of whole capacitor device shell with the temperature of this point, can cause bigger error like this.
Summary of the invention
The objective of the invention is: the loss measurement method of a kind of power capacitor under the multi-frequency power supply is provided, it is the measurement of its lost heat energy that equivalence is measured in condenser loss, the bridge method that influenced by supply frequency is converted to and not influenced by supply frequency, and directly surveys the method for capacitor dissipation energy.This method has extensive applicability, is not only applicable to power capacitor, also is applicable to other electric equipment, is not only applicable to the multi-frequency power supply, is applicable to the loss measurement under other all kinds of power supplys too.
The concrete scheme that the present invention deals with problems is: the loss measurement method of power capacitor under the multi-frequency power supply, it is characterized in that: the measured capacitance device is positioned among the thermally insulated container, fill the less insulation liquid medium of specific heat in the container, with the capacitor making alive to the measurement state, pick up counting, cut off the power supply after obvious rising is arranged through finding the liquid medium temperature of insulation after a while; After this, keep capacitor some time among thermally insulated container, till capacitor and the liquid medium temperature of insulation all no longer change, the difference of capacitor temperature is capacitor and the temperature rise value of the liquid medium that insulate before capacitor temperature and the making alive at this moment, quality, specific heat, temperature rise according to capacitor and insulation liquid medium, just can obtain the heat that they absorb, be the loss heat energy of capacitor, use this heat energy value divided by capacitor conduction time again, just obtained the loss power of capacitor.
Principle of the present invention is: because the loss in the capacitor is based on liquid dielectric loss, the export license of insulating, polarization loss only accounts for a very little part, loss substantially all is converted into heat energy, can improve the temperature of capacitor on the one hand, can improve the temperature of surrounding environment medium on the other hand.Therefore, under thermal equilibrium condition, the heat energy that the capacitor unit interval gives out just equals its loss power substantially.Based on this point, the present invention is converted into the measurement of heat energy with the measurement of loss power, because heat energy is the physical quantity of true outwardness, and from which type of supply independent connection property, is reflecting the size of the meritorious amount that consumes completely effectively.Therefore, this measuring method has avoided supply frequency to measuring the influence of loss effectively, has very solved the loss measurement problem under the multi-frequency power supply dexterously.
The beneficial effect of the method for the invention is: Measurement of capacitor and other electrical equipment loss value under a plurality of frequency power supplys more exactly, heating situation under the multi-frequency power supply has one accurately to understand and evaluation to capacitor and other electrical equipment, prevent capacitor and other electrical equipment because of loss, the inaccurate generation thermal runaway that is in operation of measurement, thereby improve capacitor and the operational reliability of other electrical equipment under specific condition.
Description of drawings
The loss measurement schematic diagram of Fig. 1 capacitance apparatus under the multi-frequency power supply.
Embodiment
Below by accompanying drawing the present invention is described further.
Description of symbols among Fig. 1: 1-temperature sensor, 2-insulated cabinet, 3-power supply, 4-support, 5-insulating oil.
As shown in Figure 1, testing capacitor is placed in the airtight rectangular parallelepiped insulated cabinet 2, is fixed on the support 4.Support 4 should be made by the lower material of thermal capacity, and should have enough physical strengths, can support the weight of electrical equipment to be measured.The interior empty size of insulated cabinet 2 is unsuitable excessive, can not be too small, should guarantee capacitor place wherein not can with condition that tank wall contacts under, size is as far as possible little.The heat that sends of capacitor at short notice can be so that dielectric attitude medium temperature produces significantly to rise like this, thereby shortens the time of test.Simultaneously, 6 faces of insulated cabinet 2 all should have enough low coefficient of heat conductivity, to guarantee that filling 100 ℃ of insulating oils 5, outside air temperature when internal tank is under 20 ℃ the condition, the temperature of insulating oil 5 descended in 24 hours and is no more than 0.5 ℃, when thereby experimental measurement calculates heat, can ignore by tank wall and be lost to airborne heat.The power supply 3 of electrical equipment is introduced in the insulated cabinet 2 by wall bushing, and good seal is answered at the sleeve pipe place, and sleeve pipe also should adopt thermal insulation material (or the very low material of coefficient of heat conductivity) to make.
With filling insulating oil 5 in the insulated cabinet case 2, leave standstill about 12 hours, make oil and capacitance apparatus in the insulated cabinet 2 all reach unified temperature everywhere, be designated as T
0Give the energising of testing capacitance equipment, the voltage and current with capacitor is adjusted to setting value fast, picks up counting, at this moment time t
0=0.Lasting energising 8 hours, the temperature sensor 1 that be attached on capacitor surface and the insulated cabinet inwall this moment all obvious temperature rise should occur, if a certain sensor temperature rise is lower than 2 ℃, then should continue energising, and deenergization when temperature rise surpasses 2 ℃ is write down time point t at this moment
1Leave standstill a period of time (generally requiring more than 24 hours), till capacitor and oily temperature reached uniformity, the temperature of this moment was designated as T
1Can calculate the active loss power of testing capacitor by formula (2).
In the formula:
W: the active loss power of testing capacitor, the W of unit;
m
1: the quality of insulating oil, units;
c
1: the specific heat capacity of insulating oil, the J/kg.K of unit;
m
2: the quality of testing capacitor, units;
c
2: the specific heat capacity of testing capacitor, the J/kg.K of unit.
Under a plurality of frequency Power Supplies Condition, measuring actual active loss is very significant to improving the capacitor operational reliability.Because this has embodied the size of capacitor total losses amounts truly, the actual motion condition of capacitor there is objective appraisal, run unit can be taken measures at problem, reach the purpose that improves operational reliability.Therefore, be also to be necessary rationally with active loss as the parameter of an evaluation capacitor quality.
Claims (1)
1. the loss measurement method of power capacitor under the multi-frequency power supply, it is characterized in that: the measured capacitance device is positioned among the thermally insulated container, fill the less insulation liquid medium of specific heat in the container, with the capacitor making alive to the measurement state, pick up counting, cut off the power supply after obvious rising is arranged through finding the liquid medium temperature of insulation after a while; After this, keep capacitor some time among thermally insulated container, till capacitor and the liquid medium temperature of insulation all no longer change, the difference of capacitor temperature is capacitor and the temperature rise value of the liquid medium that insulate before capacitor temperature and the making alive at this moment, quality, specific heat, temperature rise according to capacitor and insulation liquid medium, just can obtain the heat that they absorb, be the loss heat energy of capacitor, use this heat energy value divided by capacitor conduction time again, just obtained the loss power of capacitor.
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| CN2009102729602A CN101701991B (en) | 2009-11-27 | 2009-11-27 | Method for measuring consumption of power capacitor under the condition of multifrequency power supply |
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| CN2009102729602A CN101701991B (en) | 2009-11-27 | 2009-11-27 | Method for measuring consumption of power capacitor under the condition of multifrequency power supply |
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| CN101701991A CN101701991A (en) | 2010-05-05 |
| CN101701991B true CN101701991B (en) | 2011-08-31 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257278A (en) * | 2013-04-24 | 2013-08-21 | 兰州空间技术物理研究所 | Medium material conductivity testing device and method |
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| CN106771646A (en) * | 2016-12-30 | 2017-05-31 | 西安中车永电捷通电气有限公司 | Power device loss test mthods, systems and devices |
| CN109470916A (en) * | 2017-09-07 | 2019-03-15 | 南方电网科学研究院有限责任公司 | It is a kind of for measuring the device and method of the loss power of inverter |
| CN111751636B (en) * | 2019-03-29 | 2022-09-23 | 南京南瑞继保电气有限公司 | Equivalent temperature rise test method for damping capacitor of high-voltage converter valve |
| CN112630542B (en) * | 2020-10-30 | 2022-05-20 | 国网宁夏电力有限公司 | Loss test method, medium and system for filter capacitor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226218A (en) * | 2007-12-28 | 2008-07-23 | 西安电力机械制造公司 | Method for testing life of power condenser element |
| CN101387670A (en) * | 2008-10-21 | 2009-03-18 | 华南理工大学 | Dielectric loss on-line measurement apparatus for power capacitor |
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2009
- 2009-11-27 CN CN2009102729602A patent/CN101701991B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226218A (en) * | 2007-12-28 | 2008-07-23 | 西安电力机械制造公司 | Method for testing life of power condenser element |
| CN101387670A (en) * | 2008-10-21 | 2009-03-18 | 华南理工大学 | Dielectric loss on-line measurement apparatus for power capacitor |
Non-Patent Citations (2)
| Title |
|---|
| JP昭59-99362A 1984.06.08 |
| 沈文琪."正确测量电力电容器的电容和tanδ".《电力电容器》.2006,(第6期),38-43. |
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