SU989658A1 - Device for protecting electric motor from incomplete mode - Google Patents
Device for protecting electric motor from incomplete mode Download PDFInfo
- Publication number
- SU989658A1 SU989658A1 SU813256502A SU3256502A SU989658A1 SU 989658 A1 SU989658 A1 SU 989658A1 SU 813256502 A SU813256502 A SU 813256502A SU 3256502 A SU3256502 A SU 3256502A SU 989658 A1 SU989658 A1 SU 989658A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- thyristor
- diode
- capacitor
- phase
- dynistor
- Prior art date
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- Protection Of Generators And Motors (AREA)
- Motor And Converter Starters (AREA)
Description
Изобретение относитс к релейной защите и может использоватьс дл защиты электродвигателей от неполнофазных режимов.The invention relates to relay protection and can be used to protect electric motors from non-phase modes.
Извес тны устройства дл защиты трехфазных электродвигателей от неполнофазных режимов, принцип действи которых основан на контроле тока в фазах, напруэсжени на предохранител х и напр х;ени на нейтрали двигател I.The devices for protection of three-phase electric motors against non-full-phase modes, the principle of action of which is based on the control of current in phases, voltage on fuses and voltages; on the neutral of engine I.
Недостатком этих устройств вл етс необходимость установки специальных релейных устройств. Крометого, последние нельз применить при соединении обмоток двигател в треугольник .The disadvantage of these devices is the need to install special relay devices. In addition, the latter can not be applied when connecting the motor windings in a triangle.
Наиболее близким к предложенному вл етс устройство, которое дл предотвращени ложного отключени пускател при понижении напр жени сети снабжено тиристорным ключом и вспомогательными диодаг-ш. Такое устройство срабатывает при обрыве фазы и по влении бестоковой паузы в тиристоре C2J.The closest to the proposed device is a device that is equipped with a thyristor key and auxiliary diode-sh to prevent false disconnection of the actuator when the supply voltage drops. Such a device is triggered when the phase is broken and a dead pause in the C2J thyristor appears.
Однако возможен режим, когда после обрыва фазы скорость вращени рототора двигател практически не уменьшаетс , и в отключенной фазной обмотке двигател наводитс ЭДС достаточна дл устранени бестоковой паузы в тиристоре, и последний йе закрываетс .However, a mode is possible when, after a phase break, the rotational speed of the motor's rotor practically does not decrease, and in the disconnected phase winding of the motor, the EMF is sufficient to eliminate the dead time in the thyristor, and the latter does not close.
Цель изобретени - повышение надежности срабатывани устройства при наличии ЭДС в отключенной фаз- ной обмотке двигател . The purpose of the invention is to increase the reliability of operation of the device in the presence of EMF in the disconnected phase winding of the engine.
Поставленна цель достигаетс The goal is achieved
10 тем, что в устройстве дл защиты электрического двигател от неполнофазного режима, содержсццем подключенный к сети трехфазный выпр митель, магнитный пускатель, обмотка кото15 рого зашунтирована первым диодом, последовательно соединенные кнопки, Стоп и Пуск, второй диод, тиристор , управл ющий электрод которого через резистор соединен с анодом 10 in that in the device for protection of the electric motor from an incomplete phase mode, a three-phase rectifier connected to the network, a magnetic starter, the winding of which is bridged by the first diode, the series-connected buttons, Stop and Start, the second diode, the thyristor, the control electrode of which through the resistor is connected to the anode
20 второго диода, катод которого подключен через соединенные последовательно резистор, выполненный в виде сигнальной лампы, и блок-контакт магнитного пускател к точке соеди25 нени упом нутых кнопок, обмотка магнитного пускател включена между средней точкой трехфазного выпр мител и кнопкой Стоп, а параллельно тиристору включены соединенные 20 of the second diode, the cathode of which is connected via a series-connected resistor, made in the form of a signal lamp, and a blocking contact of the magnetic actuator to the point of connection of the buttons, the winding of the magnetic actuator is connected between the middle point of the three-phase rectifier and the Stop button, and parallel to the thyristor are turned on United
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU813256502A SU989658A1 (en) | 1981-03-06 | 1981-03-06 | Device for protecting electric motor from incomplete mode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU813256502A SU989658A1 (en) | 1981-03-06 | 1981-03-06 | Device for protecting electric motor from incomplete mode |
Publications (1)
Publication Number | Publication Date |
---|---|
SU989658A1 true SU989658A1 (en) | 1983-01-15 |
Family
ID=20946163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU813256502A SU989658A1 (en) | 1981-03-06 | 1981-03-06 | Device for protecting electric motor from incomplete mode |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU989658A1 (en) |
-
1981
- 1981-03-06 SU SU813256502A patent/SU989658A1/en active
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