METHOD OF GENERATOR RELAY PROTECTION Russian patent published in 2017 - IPC H02H7/06 

FIELD: electricity.

SUBSTANCE: generator is observed from the side of the line and neutral terminals. The moment of switching the previous mode to the current mode is recorded. The algorithmic model is activated by voltage sources of the current mode. Its reaction is defined in the form of the first currents of the stator winding. If the generator is not damaged, then the first currents will be close to the observed ones, since the model in this case is adequate to the real object. If the generator is damaged, the adequacy is violated, and then the difference between the first currents and the observed values is physically predetermined. This circumstance is used to recognize emergency situations in the generator, relying on the second currents as the difference between the corresponding observed and first currents. According to the method, a basis of complex values is used, in which separate self-contained modules of the algorithmic model are built. There are three such modules: of the previous mode, of the direct sequence and of the reverse sequence. The first two are active - they include one and the same voltage source. The third module is passive. Since the generator was believed sound, the suggestion to train relay protection by only those modes when the short circuit, if it takes place, occurs not in the generator, but in the external part of the network, becomes evident. The results of such training are the areas of protection locking, the smaller they are, the more adequate the simulation model of the network is to the real object. Training is carried out on the planes of two-dimensional signals. In a complex form, the two-dimensional signal is defined as the ratio of the second currents to the corresponding first currents.

EFFECT: increase in the degree of protection.

3 cl, 12 dwg