METHOD FOR PROTECTION OF A SYNCHRONOUS MACHINE FROM AN ASYNCHRONOUS MODE (VERSIONS) Russian patent published in 2020 - IPC H02H7/06 H02H7/08 H02H7/85 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used for protection of synchronous machines from asynchronous mode. In the method of protecting a synchronous machine from an asynchronous mode, which is characterized by features specified in the restrictive part of the independent claim of the first embodiment, additionally measuring the stator current of the synchronous machine, according to the program recorded in the controller memory unit, the synchronous machine current and voltage values fixed values are calculated for the synchronous machine active power (electromagnetic torque) value, comparing this value with the fixed value of the primary engine shaft torque value, fixing the difference obtained as a result of comparison and generating a control signal based on the fixed difference between the fixed values of the torque of the primary motor shaft and the active power of the synchronous machine and the program recorded in the controller memory unit. According to the second version of the method of protecting a synchronous machine from an asynchronous mode, the generated control signal is transmitted to the corresponding input of the control system of the primary motor, reducing the supply of energy carrier supplied to the primary engine by fast-acting unloading of the synchronous machine by active power to the permissible level, thus protecting the synchronous machine against unacceptable overheating by temperature of the structural elements of the synchronous machine during its operation in asynchronous mode. Increase in response time of protection of synchronous machine from asynchronous mode is due to the fact that operation of protection occurs before the onset of the first asynchronous rotation of rotor of synchronous machine, wherein operation of synchronous machines in asynchronous mode is eliminated with considerable oscillations of active and reactive power, rotor slip, current and voltage of stator and rotor, which are available at synchronous machine rotor first asynchronous rotation (at angle between voltage and internal EMF of synchronous machine from 180–270 electric degrees, when these oscillations are maximum), and as a result, probability of especially severe accidents with damage of expensive synchronous machines is reduced.

EFFECT: technical result is faster operation of protection of synchronous machine from asynchronous mode.

8 cl, 2 dwg