DEVICE FOR AUTOMATIC DETERMINATION OF EMERGENCY FEEDER

A device for automatically determining the emergency feeder refers to the measuring technique and can be used to identify the feeder with single-phase ground fault in electrical networks with isolated neutral. The device comprises a power transformer, a ground loop, the system of three-phase busbars, distribution three-phase feeders, measuring voltage transformer with windings connected in a "star with a zero-star with a zero-open delta", auxiliary transformer, the power transformer is connected to a three-phase system busbar, to which there are attached distribution three-phase feeders, galvanic isolation is included, microcontroller, GSM / GPRS-modem, controller high-voltage switchgear, high voltage switchboard, special terminal of zero point of high-voltage own needs auxiliary transformer winding, the input of galvanic iculation is connected to the secondary winding of the measuring voltage transformer, output of galvanic isolation is connected to the microcontroller input, the first microcontroller output is connected to the GSM / GPRS-modem, and the second microcontroller output is connected to the input of the control unit the high-voltage switching device, the output of which is connected to drive the high-voltage switching device, the output of high-voltage switchgear apparatus is connected to the earthing system, the input of high voltage switching device is connected to a special terminal of zero point of high-voltage auxiliary transformer winding. The technical result is the elimination of power supply mode failure in networks with insulated neutral and reducing time and labor costs for the identification of damaged line due to short-term artificial connections of zero point of the winding of high voltage transformer of own needs with the grounding circuit. Устройство для автоматического определения аварийного фидера относится к измерительной технике и может быть использовано для выявления фидера с однофазным замыканием на землю в электросетях с изолированной нейтралью. Устройство содержит силовой трансформатор, контур заземления, системы трехфазных сборных шин, распределительные трехфазные фидеры, измерительный трансформатор напряжения с обмотками, соединенными по схеме "звезда с нулем-звезда с нулем-разомкнутый треугольник", трансформатор собственных нужд, причем силовой трансформатор подключен к системе трехфазных сборных шин, к которым присоединены распределительные трехфазные фидеры, введена гальваническая развязка, микроконтроллер, GSM / G