SU676949A1 - Method of detecting interturn short-circuiting - Google Patents
Method of detecting interturn short-circuitingInfo
- Publication number
- SU676949A1 SU676949A1 SU772485319A SU2485319A SU676949A1 SU 676949 A1 SU676949 A1 SU 676949A1 SU 772485319 A SU772485319 A SU 772485319A SU 2485319 A SU2485319 A SU 2485319A SU 676949 A1 SU676949 A1 SU 676949A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- windings
- emf
- circuiting
- detecting
- interturn short
- Prior art date
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Description
1one
Изобретение относитс к области электротехники , а именно к способам испытани электрических машин.The invention relates to the field of electrical engineering, in particular to methods for testing electrical machines.
Известны способы обнаружени межвиткового замыкани , основанного иа срыве генерации при наличии в статоре электрических машин короткозамкнутых витков 1.Methods are known for detecting an inter-turn closure based on generation failure in the presence of short-circuited turns 1 in the stator of electrical machines.
Однако этот способ не дает возможности достаточно точно обнаруживать межвитковое замыкание.However, this method does not allow detecting the interturn circuit sufficiently accurately.
Известен способ межвиткового замыкани , включающий соединение двух обмоток встречно с последующей подачей напр жени и измерение ЭДС в момент прохождени тока через нулевое значение 2.The known method of interturn closing, including the connection of two windings in the opposite direction with the subsequent supply of voltage and measurement of the emf at the moment the current passes through zero value 2.
Такой способ достаточно сложен и не дает высокой точности обнаружени межвиткового замыкани .This method is rather complicated and does not give high accuracy of detection of the interturn closure.
Цель изобретени - упрощение и повышение точности обнаружени межвиткового замыкани .The purpose of the invention is to simplify and improve the detection accuracy of the interturn closure.
Поставленна цель достигаетс тем, что по предлагаемому способу измерение ЭДС производ т на третьей обмотке.The goal is achieved by the fact that according to the proposed method, the measurement of the emf is made on the third winding.
На чертеже показана схема дл осуществлени способа обнаружени межвиткового замыкани .The drawing shows a circuit for implementing a method of detecting an inter-turn closure.
К испытуемым обмоткам 1 и 2 трехфазной электрической мащины, обмотки которой соединены в звезду, подключаетс источник посто нного тока.A DC power source is connected to the tested windings 1 and 2 of a three-phase electric masking, the windings of which are connected in a star.
В индикаторной обмотке 3 замер етс ЭДС взаимоиндукции. В момент отключени испытуемых обмоток от источника посто нного тока одновременно производитс индикаци ЭДС самоиндукции в этих обмотках. Величина ЭДС в индикаторной обмот ке определ етс разностью потоков Ф; и ФгIn the indicator winding 3, the emf of mutual induction is measured. At the moment of disconnection of the tested windings from the DC source, the indication of self-induced emf in these windings is simultaneously performed. The magnitude of the emf in the indicator winding is determined by the difference in flux Φ; and Fg
ДФ - Ф, -f Фг,DF - F, -f Fg,
где Фь Фг - векторные величины потоков, наводимые обмотками соответствующихwhere Ф Ф Фг - vector values of flows induced by windings of the corresponding
фаз электрической машины в момент отключени их от источника посто нного тока .phases of the electric machine at the time of their disconnection from the source of direct current.
При отсутствии нарушени межвитковой изол ции в испытуемых обмотках ЭДС, наведенна в индикаторной обмотке, равна нулю, т. е.If there is no violation of inter-turn insulation in the tested windings, the EMF induced in the indicator winding is zero, i.e.
ДФ-ОД/.. -1).0, atDF-OD / .. -1) .0, at
й(ДФ)st (df)
- скорость изменени потока - rate of change of flow
где Where
dt АФ.dt AF
ЭДС самоиндукции на испытуемых обмотках составл етThe emf of self-induction on the test windings is
dfdf
lit - /i, - - -- + Д потер.-lit - / i, - - - + D pot.
dtdt
di dtdi dt
+ 4/,+ 4 /,
потер- tlost t
где Д/потер. - потери ЭДС, вызванные наличием специальных короткозамкнутых витков (трехфазного электрического двигател с короткозамкнутым ротором), утечки в обмотках электрической машины в изол торах и т. д.where D / rub. - EMF losses caused by the presence of special short-circuited coils (a three-phase electric motor with a squirrel-cage rotor), leaks in the windings of an electric machine in insulators, etc.
Пример. Испытывали трехфазный электрический двигатель типа А02-42-4 (Рн 5,5 КВТ, л 1450 об/мин, т 87%) в собранном виде. При испытании использовали источник посто нного тока, измерительное устройство, устройство индикации ЭДС самоиндукции. Испытани проводили в три ступени.Example. They tested a three-phase electric motor of the type A02-42-4 (PH 5.5 KW, l 1450 rpm, t 87%) in assembled form. When testing, a direct current source, a measuring device, and a self-induction EMF indication device were used. The tests were carried out in three stages.
При идентичном витковом замыкании во всех трех (двух) обмотках электрической машины с общим числом замкнутых витков менее 5% ЭДС в обмотках, вз тых за индикаторные, значительно отличаетс , так как величина нарушени межвитковой изол ции зависит от таких факторов, как количество охваченных витков, от переходного сопротивлени в местах нарушени , а они во всех возможных случа х отличаютс . В обмотках электродвигателей идентичное межвитковое замыкание полностью исключаетс . Это объ сн етс конструктивным исполнением обмоток электрических многообмоточных двигателей.With identical turn closure in all three (two) windings of an electric machine with a total number of closed turns less than 5% of the EMF in the windings taken as indicator, it is significantly different, since the amount of inter-turn insulation breakdown depends on factors such as the number of turns covered, from transient resistance in the places of violation, and they are different in all possible cases. In motor windings, an identical interturn circuit is completely excluded. This is due to the design of the windings of electric multiple-winding motors.
При нарушении межвитковой изол ции сIn case of inter-turn insulation isolation
числом короткозамкнутых витков более 5% (в зависимости от конструктивного исполнени устройства) индикацию степени межвиткового замыкани определ ют по величине ЭДС самоиндукции, котора при таком нарушении мало зависит от типа электрических машин, от индуктивности их обмоток и имеет незначительную величину. Рассмотренный случай наиболее веро тенthe number of short-circuited turns of more than 5% (depending on the design of the device), the indication of the degree of inter-turn closure is determined by the value of the EMF of self-induction, which, with such a violation, depends little on the type of electric machines, on the inductance of their windings and has a small value. The case considered is most likely
при замыкании в двух-трех обмотках многофазной машины.when closed in two or three windings of a multi-phase machine.
Таким образом, предлагаемый способ позвол ет вы вл ть наличие короткозамкнутых витков и устран ть их. В результате этого снижаютс затраты на ремонт электрического оборудовани и повышаетс надежность работы электрических ; машип .Thus, the proposed method makes it possible to detect the presence of short-circuited turns and eliminate them. As a result, the cost of repairing electrical equipment is reduced and the reliability of electrical operation increases; typewriter
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU772485319A SU676949A1 (en) | 1977-05-13 | 1977-05-13 | Method of detecting interturn short-circuiting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU772485319A SU676949A1 (en) | 1977-05-13 | 1977-05-13 | Method of detecting interturn short-circuiting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU676949A1 true SU676949A1 (en) | 1979-07-30 |
Family
ID=20708717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU772485319A SU676949A1 (en) | 1977-05-13 | 1977-05-13 | Method of detecting interturn short-circuiting |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU676949A1 (en) |
-
1977
- 1977-05-13 SU SU772485319A patent/SU676949A1/en active
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