METHOD OF PROTECTING ELECTRIC MACHINES AGAINST OVERLOADS

Method of protecting electric machine against overloads involves measuring the levels of currents of the electric machine, determining the values of their squares, forming a time series the partial sums of the squares of the currents, removing the last value in the time series when you receive the next value of the square of the current of the electric machine, the offset of one step forward all elements of the time series, setting the first time series is again the measured value of the square of the current and summing it with the content of other elements in the time series, signal processing for disconnecting the electrical machine from the power supply in excess of the sum of the squares of the current in any element of the time series an acceptable level. Form information points time series the partial sums of the squares of phase currents of the electric machine, the first three form level time series with partial sums of the squares of the currents of the three phases of the electric machine, according to the first three links determine the phases with highest and lowest currents for the phase with the most current form the following links time series and continue to shape the time series of the phase with the highest values of partial sums of the squares of the currents on the period since the formation of the signal to switch off the electric machine to reset all the components of the time series or within 3...4 constant heating time of the electric machine after its actual disconnection from the power supply. When exceeding the permissible level of the relative difference between the values of the partial sums of the squares of the currents of the phases with the highest and lowest downloads form the warning signal. Способ защиты электрической машины от перегрузок предусматривает измерение уровней токов электрической машины, определение значений их квадратов, формирование временного ряда частичных сумм квадратов токов, удаление последнего значения временного ряда при поступлении очередного значения квадрата тока электрической машины, смещение на шаг вперед содержания всех элементов временного ряда, установка на первое место временного ряда вновь измеренного значения квадрата тока и суммирование его с содержимым остальных элементов временного ряда, формирование сигнала на отключения электрической машины от сети питания при превышении суммы квадратов тока в любом элементе временного ряда допустимого уровня. Формируют информационные точки временных