RU2012116675A

RU2012116675A - METHOD FOR MONITORING FALSE OR EMERGENCY SHUT-OFF AND FAILURE OF AUTOMATIC RE-TURNING ON OF THE KEY SWITCH OF A LINE SUPPLYING A TRANSFORMER SUBSTATION, DETERMINING THE TYPE OF SHORT SHUT

Info

Publication number: RU2012116675A
Application number: RU2012116675/07A
Authority: RU
Inventors: Леонид Дмитриевич Суров; Татьяна Борисовна Сурова; Наталья Витальевна Махиянова
Priority date: 2012-04-24
Filing date: 2012-04-24
Publication date: 2013-10-27
Also published as: RU2502178C1

Abstract

Способ контроля ложного или аварийного отключения и отказа автоматического повторного включения (АПВ) головного выключателя (ГВ) линии, питающей трансформаторную подстанцию, с определением вида короткого замыкания (КЗ), заключающийся в фиксации бросков токов КЗ и в измерении времени между ними, отличающийся тем, что с момента исчезновения напряжения на шинах трансформатора и отсутствии тока КЗ через него начинают отсчет времени, равный времени выдержки АПВ ГВ и во все провода линии посылают зондирующие импульсы, измеряют время, за которое они дойдут до точек отражения, вычисляют расстояния до этих точек, сравнивают их между собой и с расстоянием до места установки ГВ и, если все вычисленные расстояния равны друг другу и больше, чем расстояние до ГВ, то делают вывод о ложном отключении ГВ, а если все вычисленные расстояния равны друг другу и меньше, чем расстояние до ГВ или два вычисленных расстояния равны друг другу и меньше третьего, которое равно расстоянию до ГВ, то делают вывод об аварийном отключении ГВ, в момент окончания отсчитываемого времени контролируют появление напряжения на шинах подстанции и, если оно не появилось, то во все провода линии снова посылают зондирующие импульсы, измеряют время, за которое они дойдут до точек отражения, вычисляют расстояния до этих точек, сравнивают их между собой и с расстоянием до ГВ и, если все вычисленные расстояния равны друг другу и меньше, чем расстояние до ГВ, то делают вывод об отказе АПВ ГВ при устойчивом трехфазном КЗ, а если два вычисленных расстояния равны друг другу, но меньше третьего, которое равно расстоянию до ГВ, то делают вывод об отказе АПВ ГВ при усто�A method for monitoring a false or emergency shutdown and failure of automatic reclosing (AR) of the main switch (GV) of the line supplying the transformer substation, with the definition of the type of short circuit (SC), which consists in fixing the inrush currents of short circuit and in measuring the time between them, which differs in that that from the moment the voltage on the busbars of the transformer disappears and there is no short-circuit current through it, a time count equal to the holding time of the GV automatic reclosure begins and probing pulses are sent to all the wires of the line, they measure the time it takes to reach the reflection points, calculate the distances to these points, compare them to each other and with the distance to the installation site of the GW and, if all the calculated distances are equal to each other and greater than the distance to the GW, then a conclusion is made about a false disconnection of the GW, and if all the calculated distances are equal to each other and less than the distance to the GW or two calculated distances are equal to each other and less than the third, which is equal to the distance to the GW, then a conclusion is made about emergency shutdown of GW, at the end of the countdown time, the appearance of voltage on the substation buses is monitored and, if it has not appeared, then probing pulses are sent to all the wires of the line, the time it takes for them to reach the reflection points is measured, the distances to these points are calculated, and they are compared them to each other and with the distance to the GW and, if all the calculated distances are equal to each other and less than the distance to the GW, then it is concluded that the GW automatic reclosure fails with a stable three-phase short circuit, and if the two calculated distances are equal to each other, but less than the third, which is equal to the distance to the GW, then a conclusion is made about the failure of the automatic reclosure of the GW when the

Claims

The method of monitoring false or emergency shutdown and failure of automatic restart (AR) of the head switch (GV) of the line supplying the transformer substation, determining the type of short circuit (short circuit), which consists in fixing the surges of short-circuit currents and in measuring the time between them, characterized in that from the moment of disappearance of voltage on the transformer tires and the absence of short-circuit current through it, a countdown starts, equal to the exposure time of the automatic recirculation arrester, and probes are sent to all wires of the line, the time for which f they reach the reflection points, calculate the distances to these points, compare them with each other and with the distance to the location of the hot water and, if all the calculated distances are equal to each other and greater than the distance to the hot water, they conclude that the hot water is turned off, and if all the calculated distances are equal to each other and less than the distance to the hot water or two calculated distances are equal to each other and less than the third, which is equal to the distance to the hot water, then make a conclusion about the emergency shutdown of the hot water, at the end of the counted time, control the appearance of voltages on the substation's tires and, if it does not appear, then probing pulses are sent to all wires of the line again, they measure the time for which they reach the reflection points, calculate the distances to these points, compare them with each other and with the distance to the hot water and all the calculated distances are equal to each other and less than the distance to the hot water, then make a conclusion about the automatic reclosure of the hot water with a stable three-phase short circuit, and if the two calculated distances are equal to each other, but less than the third, which is equal to the distance to the hot water, then make a conclusion about the failure AR reclaim chivom two-phase short-circuit.