FIELD: electricity.
SUBSTANCE: if there is no SC current and one of three linear voltages disappears at the input of the transformer, they start counting the time equal to the time of delay of HCB protection actuation, at the same time they monitor the moment of disappearance of two other linear voltages, and if at the moment of completion of time count two other linear voltages disappear, then the fact of HCB disconnection is established from the line that feeds the transformer substation, in case of double-phase SC in it. Therefore the proposed method makes it possible to produce information on disconnection of the head circuit breaker of the line, feeding the transformer substation, in case of double phase SC in it.
EFFECT: expansion of functional capabilities of the method.
2 dwg
