CN103257160B - Method for detecting winding material of three-phase winding device based on thermocouple principle - Google Patents
Method for detecting winding material of three-phase winding device based on thermocouple principle Download PDFInfo
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- CN103257160B CN103257160B CN201310144000.4A CN201310144000A CN103257160B CN 103257160 B CN103257160 B CN 103257160B CN 201310144000 A CN201310144000 A CN 201310144000A CN 103257160 B CN103257160 B CN 103257160B
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Abstract
The invention provides a nondestructive detection method of a three-phase winding material based on thermocouple principle, belonging to the technical field of medium and large-sized electric power three-phase winding devices in an electrical power system. The method concretely comprises the steps of: respectively connecting outgoing lines of all phases of windings of a three-phase winding device with copper conductive rods; carrying out asymmetrical heating on a three-phase winding by electrifying the copper conductive rods through power supplies arranged outside the copper conductive rods, so that temperature difference is generated between one phase of winding and the other two phases of windings; at the time, interrupting the current and collecting the direct current (DC) voltage between the two phases with temperature difference; if the collected DC voltage shows that parasitic thermoelectric potential is not generated, judging the winding material of a transformer is copper; and if the collected DC voltage shows that parasitic thermoelectric potential is generated and direct current voltage collected after the current is interrupted is gradually vanished, judging the winding material of the transformer is aluminum (or other non-copper materials). The method can effectively detect the winding material, and is simple to operate, convenient for detection, high in accuracy and nondestructive to electrical equipment.
Description
Technical field
The present invention relates to electric system medium-and-large-sized electric power three-phase windings equipment technical field, be specifically related to a kind of three-phase windings equipment winding material detection method.
Background technology
Large-scale power three-phase windings equipment (transformer, motor, reactor) is the most key equipment of electric system, and its quality directly affects the safety and reliability of mains supply, and the reliability of three-phase windings equipment largely depends on winding material therefor.The winding material of three-phase windings equipment is generally copper or aluminium, and copper and aluminum have larger difference in performance parameter and the market price.The mechanical property of aluminum and temperature characterisitic are not so good as copper, the difference of aluminum three-phase windings equipment Short Circuit withstand Performance Ratio copper winding device, and the market price of aluminium is lower than copper, adopts aluminium winding three-phase winding device can obtain higher economic benefit in some cases.Such as, for the oil immersed type three-phase transformer that has dispatched from the factory, be difficult to judge its winding material by its outward appearance and basic parameter, so that occur the situation that aluminium winding transformer is sold as copper winding transformer by some transformers supplier.2011, " electrically China " magazine in the 4th phase in o. 11th, publish the report of 14 sections of transformer industries " health check-up " continuously altogether, wherein had two sections of quality problems reporting Transformer Winding " with aluminium for copper ", cause the great attention of general headquarters of State Grid Corporation of China.
The Conductivity Ratio copper of aluminium is little, for keeping aluminium winding terminal resistance identical with copper winding, then need to increase aluminum conductor sectional area, cause three-phase windings equipment volume to increase the most at last, but different suppliers same model volume of transformer differs greatly, only carry out the judgement not science of winding material according to volume.Aluminium conductivity varies with temperature situation and copper exists significant difference, can heat three-phase windings Whole Equipment, can carry out the judgement of winding material by measuring winding resistance variation with temperature curve, but this method needs large-scale firing equipment, test operability is not strong.
There is no the material of simple and effective method to three-phase windings equipment winding at present and carry out Non-Destructive Testing.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of lossless detection method of simple and practical three-phase windings equipment winding material, effectively can detect that winding material is copper or aluminium, have simple to operate, accuracy is high and the feature harmless to power equipment.
For achieving the above object, the invention provides a kind of detection method of three-phase windings equipment winding material, be specially: each phase winding extension line of three-phase windings equipment connects a copper conducting rod respectively, pass into electric current through copper conducting rod additional power source and Heated asymmetrically is carried out to three-phase windings, make wherein to produce the temperature difference between a phase winding and other two phase winding, now, turn-off current, gathers the two alternate DC voltage that there is the temperature difference; If the DC voltage gathered shows not produce Parasitic EMF during Measuring, then judges that Transformer Winding material is as copper, if the DC voltage gathered shows generation Parasitic EMF during Measuring, and the DC voltage gathered after turn-off current fades away and then judges that winding material is as aluminium.
Further, determine whether in the following manner produce Parasitic EMF during Measuring: if gather DC voltage relative to reference value without significant change, then do not produce Parasitic EMF during Measuring, otherwise, produce Parasitic EMF during Measuring; Described reference value equivalence is the alternate DC noise voltage gathered before heating.
Further, stating the heat time is 5min ~ 10min.
Further, described three-phase windings is triangular form winding or star winding.
Further, described electric current is by responding to or directly passing into.
Technique effect of the present invention is embodied in:
The present invention by realizing the Heated asymmetrically of three-phase windings at copper conducting rod additional power source, utilize three-phase windings equipment conducting rod and winding material inconsistent time there is parasitic heat galvanic couple phenomenon realize the Non-Destructive Testing of winding material.The method has simple to operate, that detection is convenient, antijamming capability is strong advantage, has filled up the blank at present to large-scale power three-phase windings equipment and materials detection method.
Accompanying drawing explanation
Fig. 1 is Cleaning Principle schematic diagram of the present invention;
Fig. 2 is detecting step process flow diagram of the present invention;
Fig. 3 is the wiring diagram of the embodiment of the present invention;
Fig. 4 is the DC voltage measurement data and curves figure of the embodiment of the present invention;
Fig. 5 is the change curve that the DC voltage of the embodiment of the present invention returns to reference value.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
See Fig. 1, Cleaning Principle of the present invention is: due to the requirement of electric property and mechanical property, the conducting rod materials regulations of three-phase windings equipment is copper material, if winding material adopts aluminium (or other non-copper materials), there is the phenomenon of parasitic heat galvanic couple when so copper conducting rod is inconsistent with aluminium matter winding material at its phase contact place, the detection of winding material can be realized accordingly.
Detection method is: each phase winding extension line of three-phase windings equipment connects a copper conducting rod respectively, by at conducting rod additional power source to three-phase windings Heated asymmetrically, make wherein to produce the temperature difference between a phase winding and other two phase winding, now, disconnect heating power supply, gather the two alternate DC voltage that there is the temperature difference; The DC voltage that namely Parasitic EMF during Measuring gather if do not produce there is no significant change relative to reference value, then can judge that Transformer Winding material is copper, if produce the DC voltage that namely gathers of Parasitic EMF during Measuring to there is significantly change (being such as more than 10 times of reference value) to for reference value, and the DC voltage gathered after disconnecting heating power supply reverts to reference value gradually then can judge that winding material is aluminium.
See Fig. 1 and 2, for threephase oil immersed transformer, the step that the present invention is applied to Transformer Winding material tests is as follows:
(1) the asymmetric electrical heating method of Three-Phase Transformer winding:
As shown in Figure 1, Transformer Winding is connected with outside line by the conducting rod being installed on top.Conducting rod materials regulations is copper material.If Transformer Winding is aluminium, between aluminium winding and conducting rod, the difference due to material is formed parasitic heat galvanic couple.For the winding (see Fig. 1 (a)) of triangular form connection, pass into current flow heats AB is alternate, the winding temperature making AB alternate is higher than the alternate winding temperature of AC and BC; For the winding (be neutral point see Fig. 1 (b), O) of wye connection, pass into electric current AB is alternate, winding is heated between AO and between BO, and its temperature is higher than the winding temperature between CO.A, B phase winding extension line and conducting rod binding site will produce Joule heat, because transformer oil heating time constant is generally 2.5 ~ 3.5h, and copper heating in winding time constant is generally 4 ~ 7min, aluminium winding is 2 ~ 4min, in test, the heat time can be decided to be 5 ~ 10min, and now transformer oil is not yet sufficiently heated and can not has an impact to thermopair.
(2) detection of DC voltage:
Before heating, first with High-accuracy direct current voltage table, the alternate DC noise voltage signal of transformer is detected, detect data as reference value.Deenergization after Heated asymmetrically, accesses voltage table immediately, obtains the DC voltage data that transformer AC or BC is alternate.
(3) material identification:
If in testing result AC or BC alternate relative to reference value all without obvious DC voltage; could judge that Transformer Winding material is copper.If AC is alternate or the alternate DC voltage of BC exists obviously, survey DC voltage and raise with the rising of heating power supply magnitude of voltage, and after deenergization, voltage reverts to reference value gradually and then can judge that winding material is aluminium in 5 ~ 10min.If this is because transformer material is copper material, then there is not parasitic heat galvanic couple between itself and conducting rod, between three-phase windings, during non-uniform temperature, can not Parasitic EMF during Measuring be produced; And if transformer material is aluminium, parasitic heat galvanic couple will produce thermopower due to the temperature difference between AC and between BC, and this value detects by High-accuracy direct current voltage table, and heating power supply magnitude of voltage is larger, then heating is also larger with the alternate temperature difference of not generating heat, and Parasitic EMF during Measuring value is also larger.After off voltage, due to cooling, the alternate temperature difference of winding reduces, and the value of Parasitic EMF during Measuring also reduces gradually, will be decreased to reference value in 5 ~ 10min.
Embodiment
For making content of the present invention more clear and intuitive, detect the S11-M-400/10 type oil immersed type three-phase aluminium winding of two same models and copper winding transformer low pressure winding material respectively, test connection as shown in Figure 3.
Take in test to pass into voltage in high-pressure side, carry out in low-pressure side the heating that method that single-phase short circuit induces big current realizes low pressure winding.Alternate with the variable power frequency ac voltage of pressure regulator access amplitude at high voltage side of transformer AC, low-pressure side passes through the enough large copper bar of sectional area by the short circuit of a phase winding, then a phase is generated heat.Before pressurization, two alternate DC voltage of test specimen low-pressure side two are detected, in test, pressure regulator is risen to a certain voltage and keep 5min, then high side voltage and short-circuit rods is disconnected, access voltage table immediately and carry out the detection of the alternate DC voltage of low-pressure side ac respectively, single test terminates rear interval 10min and carries out and test next time.
Survey DC voltage with voltage change curve added by heating power supply as shown in Figure 4.After Heated asymmetrically, aluminium transformer ac is alternate can detect obvious DC voltage, this voltage raises with supply voltage and raises, when additional power source is 100V, after off voltage survey voltage and revert to the change curve of reference value gradually as shown in Figure 5, and copper winding transformer there is no obvious DC voltage after power supply disconnects, and no-voltage returns to the process of reference value.Can judge that the method is highly effective for the detection of transformer material thus.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the lossless detection method of a three-phase windings material, be specially: each phase winding extension line of three-phase windings equipment connects a copper conducting rod respectively, pass into electric current through copper conducting rod additional power source and Heated asymmetrically is carried out to three-phase windings equipment, make wherein to produce the temperature difference between a phase winding and other two phase winding, now, turn-off current, gathers the two alternate DC voltage that there is the temperature difference; If the DC voltage gathered shows not produce Parasitic EMF during Measuring, then judge that the winding material of three-phase windings equipment is as copper, if the DC voltage gathered shows to produce Parasitic EMF during Measuring, and the DC voltage gathered after turn-off current fades away and then judges that winding material is as aluminium.
2. the lossless detection method of three-phase windings material according to claim 1, it is characterized in that, determine whether in the following manner produce Parasitic EMF during Measuring: if gather DC voltage relative to reference value without significant change, then do not produce Parasitic EMF during Measuring, otherwise, produce Parasitic EMF during Measuring; Described reference value equivalence is the alternate DC noise voltage gathered before heating.
3. the lossless detection method of three-phase windings material according to claim 1 and 2, is characterized in that, the described heat time is 5min ~ 10min.
4. the lossless detection method of three-phase windings material according to claim 1 and 2, is characterized in that, described three-phase windings is triangular form winding or star winding.
5. the lossless detection method of three-phase windings material according to claim 1 and 2, is characterized in that, described electric current is by induction or directly pass into.
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| CN201310144000.4A CN103257160B (en) | 2013-04-24 | 2013-04-24 | Method for detecting winding material of three-phase winding device based on thermocouple principle |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103604837B (en) * | 2013-11-28 | 2015-12-02 | 国家电网公司 | The recognition methods of distribution transformer coil material |
| CN105223329B (en) * | 2015-09-18 | 2017-08-08 | 重庆大学 | Transformer Winding material discrimination method based on pyroelectric effect |
| CN105973934A (en) * | 2016-07-05 | 2016-09-28 | 国网重庆市电力公司电力科学研究院 | Intelligent diagnosis device and method for transformer winding material |
| CN106353476B (en) * | 2016-09-12 | 2018-06-05 | 国网天津市电力公司 | For solving the signal pickup assembly of transformer winding material temperature-coefficient of electrical resistance |
| CN107655940B (en) * | 2017-09-18 | 2020-06-19 | 国网重庆市电力公司电力科学研究院 | Transformer winding material detection equipment and system |
| CN108414578A (en) * | 2018-03-09 | 2018-08-17 | 武汉大学 | A kind of winding Material Identification method becoming shell Optimizing based on oil |
| CN108593706B (en) * | 2018-05-18 | 2020-11-10 | 国网重庆市电力公司电力科学研究院 | Nondestructive testing system for material of winding of distribution transformer with two-end heating |
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| CN202486258U (en) * | 2012-03-07 | 2012-10-10 | 黄问贵 | Portable three-phase motor winding tester |
| CN102749342A (en) * | 2012-07-20 | 2012-10-24 | 贵州电力试验研究院 | Non-destructive identification method for material of integral coil of distribution transformer |
| CN202886475U (en) * | 2012-11-21 | 2013-04-17 | 保定金迪科学仪器有限公司 | Direct current resistance measuring meter of three-phase inductive coil |
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| CN101726515A (en) * | 2008-10-16 | 2010-06-09 | 淄博计保互感器研究所 | Tester and testing method for winding lead material of transformer |
| CN202486258U (en) * | 2012-03-07 | 2012-10-10 | 黄问贵 | Portable three-phase motor winding tester |
| CN102749342A (en) * | 2012-07-20 | 2012-10-24 | 贵州电力试验研究院 | Non-destructive identification method for material of integral coil of distribution transformer |
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