FIELD: electricity.
SUBSTANCE: according to the method data components of monitored current and voltage at the feeder ends are recorded and used as input voltage and the first input current values of the feeder model. At that respective voltage values are supplied to inputs of the undamaged feeder model, second input currents are defined as the model reaction to applied voltage, the third currents are defined as difference of the respective first and second currents, levels of the third currents and degree of their identity are controlled at opposite ends of the model and in case of zero level for the third current at one of inputs the conclusion is made on short-circuiting at the other feeder input. In case of the third currents identity the conclusion is made on short-circuiting in the feeder middle, and if the third current at one input exceeds the level of the third current at the other input, then conclusion is made on short-circuiting in a half of the feeder with bigger current value. Both inputs of the model are shunted, the model is divided into submodels of damaged and undamaged halves of the feeder, the third current of the respective shunted input of the model is accepted as the first current of the damaged feeder submodel and the first current and voltage of the other input are generated in the undamaged feeder submodel out of the third current of its shunted input. In the damaged half feeder submodel with one shunted input the same operations are repeated to determine the second and third currents, to control level of third currents and degree of their identity, to determine damaged half of the model, which have been performed earlier for the initial feeder model; the above operations are repeated till identity in the third input currents is detected for the feeder submodel, which points to short-circuiting in the middle of the modelled feeder section, zero level is detected at one of the third input currents, which points to short-circuiting at the other input.
EFFECT: improved accuracy in detecting location of short-circuiting.
2 cl, 4 dwg
