SU783903A2 - Device for protecting three-phase electric motors from two-phase operation - Google Patents
Device for protecting three-phase electric motors from two-phase operation Download PDFInfo
- Publication number
- SU783903A2 SU783903A2 SU772552552A SU2552552A SU783903A2 SU 783903 A2 SU783903 A2 SU 783903A2 SU 772552552 A SU772552552 A SU 772552552A SU 2552552 A SU2552552 A SU 2552552A SU 783903 A2 SU783903 A2 SU 783903A2
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- phase
- thyristor
- coil
- relay
- diode
- Prior art date
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- Protection Of Generators And Motors (AREA)
Description
Изобретение относится к электротехнике, а именно к устройствам для защиты электродвигателей и является усовершенствованием известного устройства по основному авт. св.The invention relates to electrical engineering, namely to devices for protecting electric motors and is an improvement of the known device for the main author. St.
№ 488279.No. 488279.
Известное устройство для защиты трехфазных электродвигателей от работы на двух фазах содержит реле постоянного тока, зашунтированное конденсатором и включенное последовательно с тиристором, в цепь управления которого включен диод и резистор, а контакт реле включен в цепь управления двигателем, причем электроды тиристора подключены к фазам трехфазной сети.A known device for protecting three-phase electric motors from operating in two phases contains a DC relay shunted by a capacitor and connected in series with the thyristor, the control circuit of which includes a diode and a resistor, and the relay contact is included in the motor control circuit, and the thyristor electrodes are connected to the phases of the three-phase network .
Недостатком известного устройства является его низкая чувствительность. При обрыве фазы, связанной с цепью анода тиристора, под действием напряжения. на поврежденной фазе двигателя, не равного нулю, тиристор остается открытым и устройство не срабатывает на отключение двигателя.A disadvantage of the known device is its low sensitivity. In the event of a phase failure associated with the thyristor anode circuit, under the action of voltage. on the damaged phase of the motor, which is not equal to zero, the thyristor remains open and the device does not work to turn off the motor.
Целью изобретения является повышение чувствительности устройства.The aim of the invention is to increase the sensitivity of the device.
Эта цель достигается тем, что в известное устройство по авт. св. № 488279 дополнительно введены динистор, включенный последовательно в цепь управления тиристором, и ставили трон, включенный последовательно с обмоткой реле.This goal is achieved by the fact that in a known device according to ed. St. No. 488279, a dynistor was additionally introduced, connected in series to the thyristor control circuit, and a throne was placed, connected in series with the relay winding.
На чертеже дана электрическая схема устройства, Состоящая из катушки 1 и контакта 2 исполнительного реле, тиристора 3, .диода 4, резистора 5,. конденсатора 6, двигателя 7,'пуско10 вого контакта 8, катушки 9 и контакт тов 10 магнитного пускателя, динистора 11 и' стабилитрона 12.The drawing shows the electrical circuit of the device, consisting of a coil 1 and pin 2 of the Executive relay, thyristor 3, .diode 4, resistor 5 ,. capacitor 6, motor 7, 'starting contact 8, coil 9 and contact tov 10 of the magnetic starter, dinistor 11 and' zener diode 12.
Устройство работает следующим образом.The device operates as follows.
В нормальном режиме работы двигателя 7 тиристор 3 открывается током через динистор 11, диод 4, резистор 5, конденсатор 6 заряжен до напряжения, выше напряжения стабилиза20 ции стабилитрона 12, и катушка 1 реле обтекается током. Контакт 2 этого реле замкнут. Катушка 9 магнитного пускателя обтекается током. При обрыве фазы, например, фазы В, напряже25 ние на ней снижается, динистор 11 гаснет, и тиристор 3 запирается. Напряжение на конденсаторе 6 снижается, и гаснет стабилитрон 12. Катушка 1 реле обесточивается, его контакт 2 разрывает цепь катушки 9 магнитногоIn the normal mode of operation of motor 7, thyristor 3 is opened by current through a dynistor 11, diode 4, resistor 5, capacitor 6 is charged to a voltage above the stabilization voltage of zener diode 12, and relay coil 1 is surrounded by current. Pin 2 of this relay is closed. The coil 9 of the magnetic starter is surrounded by current. When the phase, for example, phase B, breaks, the voltage on it decreases, the dynistor 11 goes out, and the thyristor 3 closes. The voltage on the capacitor 6 decreases, and the zener diode 12 goes out. Coil 1 of the relay is de-energized, its contact 2 breaks the circuit of coil 9 of the magnetic
783903 4 пускателя. Двигатель 7 отключается от сети. ------Таким образом, включение динисто-: ра11 в цепь Управления тиристором 3 и стабилитрона 12 в цепь катушки 1 релеповышает чувствительность устройства, так как динистор 11 гаснет при наличиинапряжения на поврежденной фазе, меньшего напряжения зажигания динистора.783903 4 starters. Engine 7 is disconnected from the network. ------ Thus, the inclusion of the dyno-: pa11 in the control circuit of the thyristor 3 and the zener diode 12 in the circuit of the coil 1 increases the sensitivity of the device, since the dynistor 11 goes out when there is a voltage on the damaged phase that is lower than the ignition voltage of the dynistor.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772552552A SU783903A2 (en) | 1977-12-07 | 1977-12-07 | Device for protecting three-phase electric motors from two-phase operation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772552552A SU783903A2 (en) | 1977-12-07 | 1977-12-07 | Device for protecting three-phase electric motors from two-phase operation |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU488279 Addition |
Publications (1)
Publication Number | Publication Date |
---|---|
SU783903A2 true SU783903A2 (en) | 1980-11-30 |
Family
ID=20736968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU772552552A SU783903A2 (en) | 1977-12-07 | 1977-12-07 | Device for protecting three-phase electric motors from two-phase operation |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU783903A2 (en) |
-
1977
- 1977-12-07 SU SU772552552A patent/SU783903A2/en active
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