SU930482A1 - Three-phase electric motor differential protection method - Google Patents
Three-phase electric motor differential protection method Download PDFInfo
- Publication number
- SU930482A1 SU930482A1 SU802959841A SU2959841A SU930482A1 SU 930482 A1 SU930482 A1 SU 930482A1 SU 802959841 A SU802959841 A SU 802959841A SU 2959841 A SU2959841 A SU 2959841A SU 930482 A1 SU930482 A1 SU 930482A1
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- SU
- USSR - Soviet Union
- Prior art keywords
- electric motor
- differential protection
- protection
- phase electric
- protection method
- Prior art date
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- Protection Of Generators And Motors (AREA)
Description
(5) СПОСОБ ДИФФЕРЕНЦИАЛЬНОЙ ЗАЩИТЫ ТРЕХФАЗНОГО ЭЛЕКТРОДВИГАТЕЛЯ(5) METHOD FOR DIFFERENTIAL PROTECTION OF A THREE-PHASE ELECTRIC MOTOR
II
Изобретение относитс к электро- технике и может быть использовано дл дифференциальной защиты трехфазного электродвигател .The invention relates to electrical engineering and can be used for differential protection of a three-phase electric motor.
Известен способ дифференциальной защиты электродвигател , основанный на измерении и сравнении величин токов в нулевых и фазных выводах электродвигател .A known method of differential protection of an electric motor, based on the measurement and comparison of the values of currents in the zero and phase outputs of the electric motor.
Устройство, реализующее способ дифференциальной защиты, содержит реле тока, включенное по схеме на циркул цию TOKOU, с последовательно включенными добавочными сопротивлени ми дл ограничени тока небаланса Г1 A device that implements the differential protection method contains a current relay connected to the TOKOU circuit, with series-connected additional resistance to limit the unbalance current G1
Однако така зацита ненадежна и, кроме того, включение добавочных сопротивлений приводит к уменьшениючувствительности защиты при коротких .замыкани х внутри зоны из-за уменьшени вторичного тока короткого замыкани .However, such a setting is unreliable and, in addition, the inclusion of additional resistance leads to a decrease in the sensitivity of protection during short circuits within the zone due to a decrease in the secondary short circuit current.
Известен также способ включени реле тока через насьицамщиес трансформаторы тока (ИТТ) - продольна дифференциальна защита на реле РНТ 565 Г2:.There is also known a method for switching on a current relay through the most current current transformers (ITT) —the differential protection on the PHT 565 G2: differential lengthwise.
Однако этот способ не обеспечивает достаточную отстроенность от переходных токов небаланса, содержащих положительные и отрицательные полуволны, при пуске электродвигател .However, this method does not provide sufficient isolation from transient unbalance currents containing positive and negative half-waves when the motor is started.
Отсутствие загрублени защиты при пуске электродвигател подтверждаетс и опытами.The absence of coarse protection at the start of an electric motor is also confirmed by experiments.
Известен также способ дифференциальной защиты, согласно которому ложные срабатывани дифференциальных защит электродвигателей при пусках обусловлены значительным периодическим током небаланса, вызванным насыщением трансформаторов тока дифференциально защиты составл ющей то ка статора переменной частоты в наThere is also known a method of differential protection, according to which the false positives of differential protection of electric motors during start-ups are caused by a considerable periodic unbalance current caused by the saturation of current transformers of the differential protection of the variable frequency component of the current generator
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU802959841A SU930482A1 (en) | 1980-07-17 | 1980-07-17 | Three-phase electric motor differential protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU802959841A SU930482A1 (en) | 1980-07-17 | 1980-07-17 | Three-phase electric motor differential protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU930482A1 true SU930482A1 (en) | 1982-05-23 |
Family
ID=20909566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU802959841A SU930482A1 (en) | 1980-07-17 | 1980-07-17 | Three-phase electric motor differential protection method |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU930482A1 (en) |
-
1980
- 1980-07-17 SU SU802959841A patent/SU930482A1/en active
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