Protection relay for electrical machines
Опубликовано: 31-03-1983
Автор(ы): Walter Dipl.-Ing. 1210 Wien Garn
Принадлежит: Andritz Hydro GmbH Austria
Реферат: The invention relates to a protection relay for electrical machines, which protection relay does not operate using the constant triggering value which was normal in the past and was generally set when the protection device was brought into use and which resulted in a disconnection when it was exceeded without the capability in this case existing to take into account those factors which can significantly influence the behaviour of the machine, such as changed environmental influences, the quality of the coolant or of the cooling, changes in the environmental temperature and more complex load conditions etc. These factors can lead to destruction of machine parts even before the set limit value has been exceeded and, on the other hand, triggering can occur which would not yet be necessary because of the changed situation. The relay according to the invention prevents excessively late or unnecessary switching off in that the triggering values are continuously regulated during operation of the machine on the basis of measurements of machine parameters and their assessment in computation circuits, in the sence of reliable current limiting.
Improvements in and relating to protective cut-out arrangements for dynamo electric machines
Номер патента: GB371107A. Автор: . Владелец: British Thomson Houston Co Ltd. Дата публикации: 1932-04-21.