SU670995A1 - Arrangement for overload and phase break protection of three-phase electric motor - Google Patents
Arrangement for overload and phase break protection of three-phase electric motorInfo
- Publication number
- SU670995A1 SU670995A1 SU782591214A SU2591214A SU670995A1 SU 670995 A1 SU670995 A1 SU 670995A1 SU 782591214 A SU782591214 A SU 782591214A SU 2591214 A SU2591214 A SU 2591214A SU 670995 A1 SU670995 A1 SU 670995A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- contact
- phase
- executive relay
- winding
- thyristor
- Prior art date
Links
Landscapes
- Motor And Converter Starters (AREA)
Description
денсатором 5 и вторичной обмоткой трансформатора 1 через пороговый элемент 6 (динистор) и размыкающий контакт 7 кнопки пуска подключены между управл ющим электродом н катодом тиристора 8. Обмотка 9 коммутирующего аппарата через размыкающий контакт 10 исполнительного ptvie, параллельно соединенные замыкаюш ,ий контакт 11 кнопки пуска и блок-контакт 12, размыкающий контакт 13 кнопки останова присоединена между двум фазами . Обмотка исполнительного реле 14 подключена между анодом тиристора 8 и точкой соединени контактов 10, 11, 12.The sensor 5 and the secondary winding of the transformer 1 through the threshold element 6 (dynistor) and the disconnecting contact 7 of the start button are connected between the control electrode and the thyristor 8 cathode. and the auxiliary contact 12, the disconnecting contact 13 of the stop button is connected between the two phases. The winding of the executive relay 14 is connected between the anode of the thyristor 8 and the point of connection of the contacts 10, 11, 12.
Устройство работает следующим образом .The device works as follows.
В симметричном режиме, когда отсутствует перегрузка, напр жение между нейтралью двигател 3 и нулевым проводом близко к «нулю, падение напр жени на фазосдвигающем конденсаторе 5 меньще напр жени отпирани порогового элемента 6 (динистора). Тиристор 8 закрыт, обмотка исполнительного реле обесточена, а его контакт 10 замкнут.In the symmetric mode, when there is no overload, the voltage between the neutral of the motor 3 and the neutral wire is close to "zero", the voltage drop across the phase-shifting capacitor 5 is lower than the voltage unlocking the threshold element 6 (dynistor). The thyristor 8 is closed, the winding of the executive relay is de-energized, and its contact 10 is closed.
При возникновении симметричной перегрузки падение напр жени на конденсаторе 5 превышает напр жение динистора 6, последний открываетс и открывает тиристор 8. Реле 14 срабатывает и контактом 10 обесточивает обмотку 9 коммутирующего аппарата. Двигатель 3 отключаетс от сети.When a symmetric overload occurs, the voltage drop across capacitor 5 exceeds the voltage of dynistor 6, the latter opens and opens the thyristor 8. Relay 14 is activated and contact 10 de-energizes the winding 9 of the switching device. Engine 3 is disconnected from the network.
При обрыве одной из фаз отключение двигател происходит вследствие того, что напр жение нейтрали двигател относительно нулевого провода повыщаетс и напр жение на выходе делител 5 превыщает порог срабатывани динистора 6. Конденсатор 5 с делителем 4 составл ют фазосдвигающую цепь, обеспечивающую необходимую фазу тока управлени тиристора 8 при обрыве любой из фаз.When one of the phases is cut off, the motor is disconnected due to the fact that the neutral voltage of the motor relative to the neutral wire rises and the voltage at the output of divider 5 exceeds the threshold of dynistor 6. The capacitor 5 with divider 4 constitutes a phase-shifting circuit providing the necessary phase of the thyristor control current 8 at break of any of phases.
При пуске двигател цепь управлени тиристором разрываетс контактом 7 кнопки пуска и тем самым предотвращаетс возможность срабатывани устройства от пускового тока.When the engine is started, the thyristor control circuit is broken by the contact 7 of the start button and thus prevents the device from being able to operate from the starting current.
Таким образом в предложенном устройстве формирование сигнала управлени наThus, in the proposed device, the formation of a control signal on
переменном, а не на выпр мленном токеAC, not rectified current
приводит к упрощению схемы, добавлениеsimplifies the schema, adding
в цепь управлени размыкающего контактаopen contact control circuit
кнопки пуска обеспечивает отстройку отStart button provides tune from
пускового тока.starting current.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU782591214A SU670995A1 (en) | 1978-03-20 | 1978-03-20 | Arrangement for overload and phase break protection of three-phase electric motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU782591214A SU670995A1 (en) | 1978-03-20 | 1978-03-20 | Arrangement for overload and phase break protection of three-phase electric motor |
Publications (1)
Publication Number | Publication Date |
---|---|
SU670995A1 true SU670995A1 (en) | 1979-06-30 |
Family
ID=20753862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU782591214A SU670995A1 (en) | 1978-03-20 | 1978-03-20 | Arrangement for overload and phase break protection of three-phase electric motor |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU670995A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4771355A (en) * | 1986-12-29 | 1988-09-13 | Electric Power Research Institute, Inc. | System and method for arc detection in dynamoelectric machines |
-
1978
- 1978-03-20 SU SU782591214A patent/SU670995A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4771355A (en) * | 1986-12-29 | 1988-09-13 | Electric Power Research Institute, Inc. | System and method for arc detection in dynamoelectric machines |
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