FIELD: electricity.
SUBSTANCE: in the proposed method there controlled are all linear voltages in backup line, loss of one linear voltage in backup line is fixed, and the conclusion is made that two-phase short circuit occurred in backup line; then, loss of all linear voltages in backup line is recorded; after that, maximum hold time of actuation of network automatic reclosure is started to be reckoned. At the same time, the repeated occurrence of two linear voltages is controlled, which is determined with unsuccessful actuation of automatic reclosure to two-phase short circuit; the conclusion is made that two-phase short circuit occurred in backup line and ALT actuation signal is supplied without waiting for maximum hold time of network automatic reclosure.
EFFECT: improving accuracy of the method and simplifying its implementation owing to using only linear voltages as controlled parametre.
2 dwg
