RU94012377A - Device for integral protection of three-phase load
- Google Patents
Device for integral protection of three-phase load
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Publication number
RU94012377A
RU94012377ARU94012377/07ARU94012377ARU94012377ARU 94012377 ARU94012377 ARU 94012377ARU 94012377/07 ARU94012377/07 ARU 94012377/07ARU 94012377 ARU94012377 ARU 94012377ARU 94012377 ARU94012377 ARU 94012377A
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FIELD: electric engineering. SUBSTANCE: device has final-control unit and driving unit. Detector is designed as current transformers with resistive load, three voltage scaling circuits, comparator and starting unit, which effects final-control unit and driving unit, when protection is required, by means of hyperbolic overload response (dependence of overload time and its multiplicity). Comparator and starting unit may be designed using digital CMOS-circuits. Unlocking is performed by means of additional source with button, which is inserted in circuit of third gate, which controls second and driving unit. EFFECT: increased functional capabilities, increased reliability of protection. 4 cl, 1 dwg
Claims (1)
Изобретение относится к электротехнике и может быть использовано в защитных устройствах трехфазных симметричных (асинхронных электродвигателей) и несимметричных нагрузок. Цель заключается в расширении функциональных возможностей и увеличении показателей надежности устройства защиты. Устройство содержит исполнительный орган и исполнительный элемент, датчик выполнен в виде трансформаторов тока с резистивной нагрузкой, трех делителей напряжения, компаратора и спускового устройства, которое в аварийном режиме воздействует на исполнительный механизм и исполнительный орган, создавая перегрузочную характеристику (т.е. зависимость времени перегрузки от ее кратности) гиперболического типа. При этом компаратор и спусковое устройство могут быть выполненными на дискретных КМОП-элементах цифровой логики. Для осуществления деблокировки используется дополнительный источник с кнопкой, включенный в цепь третьего ключа, управляющего вторым и исполнительным элементом.1 ил.The invention relates to electrical engineering and can be used in protective devices of three-phase symmetric (asynchronous electric motors) and asymmetric loads. The goal is to expand the functionality and increase the reliability of the protection device. The device contains an actuator and an actuator, the sensor is made in the form of current transformers with a resistive load, three voltage dividers, a comparator and a trigger device, which in emergency mode acts on the actuator and the actuator, creating an overload characteristic (i.e., the dependence of the overload time from its multiplicity) of hyperbolic type. In this case, the comparator and the trigger device can be performed on discrete CMOS elements of digital logic. To enable the release, an additional source with a button is used, which is included in the circuit of the third key controlling the second and actuating element. 1 il.
RU94012377A1994-04-071994-04-07Gear for combined protection of three-phase loads
RU2091950C1
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