| 摘要 |
In the present invention is the temperature for rotor winding (12) measured in an alternating current machine with rotor windings (12) during operation. The measured temperature is then used to, in a controlled manner, utilise the margin in thermal material utilisation that the insulation material in alternating current machines in general has. Rotor and/or stator current can be regulated in order to give rise to a required production or consumption of active and reactive power. The currents can be allowed to exceed nominal values during a limited time, as a result of the temperature monitoring. The principle of the monitoring may also be utilised in order to give a better protection against overload. An electric power network with connected alternating current machines of this kind may at operation problems utilise existing temperature margins during shorter times in order to facilitate the continuous operation of the electrical power network. The information about the margins of the different machines may be pre-stored for an easy co-ordination of measures when faults appear. |
