H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/68
H02P 1/04 (2006.01) H02H 6/00 (2006.01) H02H 7/08 (2006.01) H02H 7/085 (2006.01) H02P 1/50 (2006.01)
Patent
CA 1310688
ABSTRACT OF THE DISCLOSURE Operational method and control switching apparatus for monitoring the starting-cycle circuit of an electric high- voltage motor with asynchronous start-up. A known operational method to protect electric motors from overloading determines rotor rotational speed and power input and compares them to stored, temperature-rise values assigned to operating condition data, in order to derive an accumulated total value, which corresponds to the relative temperature-rise condition of the motor. The new operational method and the control switching operation for large high-voltage motors with a conversion of the starting losses in the rotor should guarantee an overload protection for the rotor parts affected during asynchronous start-up and in the stalled state, under consideration of their heating and cooling behavior, also in the case of these transient processes. In the case of the operational method and the control switching operation to monitor the rotor parts of the high-voltage motor affected during start-up, the type and duration of the respective, also transient operating conditions, the stator current and rotational speed are determined and compared to operation condition matrices. Based on a theoretical temperature-rise model, a temperature-rise condition matrix represents the time-dependent, dynamic temperature-rise behavior of the rotor parts affected during start-up by displaying discrete values, which are used to monitor the possible start-ups and to control the protective devices. The method and apparatus are applicable to slipringless high-voltage asynchronous motors or high-voltage synchronous motors with asynchronous, high-performance start- up.
592872
Bredthauer Jurgen
Hirmke Werner
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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