Patent RU-2623659-C1 (RU)
Inventor: MAMAEV VIKTOR ALEKSANDROVICH
IPC: G01R27/02
Filed: 2016-05-30
Granted: 2017-06-28
Abstract: FIELD: measuring equipment. 
     SUBSTANCE: invention consists of obtaining the numerical values of the module z and the phase angle ϕ of the linear passive two-terminal circuit complex resistance  . In order to achieve the required result with the relatively simple algorithm of solving the problem in the invention method, use the instantaneous values dividing operation by the corresponding way generating of two single frequency sinusoidal electrical quantities with the repetition period T. The first auxiliary sinusoidal signal is dividing one, in which according to the method the amplitude is linearly related to the amplitude of the sinusoidal voltage applied to the linear passive two-terminal circuit, while in the sine function argument of the first auxiliary sinusoidal signal, as in the known method [RU No. 2534376], introduce the variable according to the value phase angle θ. The sinusoidal signal with the identical to the sinusoidal current parameters, passing through the linear passive two-terminal circuit, is used as the divider. The second auxiliary signal is generated as a result of the division, which is the non-sinusoidal periodic time function with discontinuities at the time moments, when the instantaneous value of the divider signal crosses the time axis. In the second auxiliary signal observe the bipolar emissions, which shape at the interruption points of the second auxiliary signal and at small difference of the introduced into the computational process the phase angle θ and the phase angle ϕ of the complex resistance   approaches to the form of "needle-shaped" bipolar impulses of the short duration. As long as the angle difference θ ϕ approaches to zero and its amplitude begins to decrease. At the decreasing of the "needle-shaped" bipolar emissions amplitudes below the prescribed value or its disappearance, which occurs at equality of the variable phase angle introduced into the computational process and the phase angle θ ϕ of complex resistance   current value, the phase angle change θ is stopped and its numerical value is taken as the phase angle ϕ of the complex resistance   . After stoppage of the phase angle value changing θ in the time interval equal to the period T, calculate the average value for the second auxiliary signal and the result is considered the numerical value of the linear passive two-terminal circuit complex resistance   module z. The method can be used both in the creation the measuring device, that provides information on the module z value and the phase angle ϕ of the linear passive two-terminal circuit complex resistance, and also when creating the relay protection measuring device and the automation device with two electrical values supplied, for example, with the function of determining the fault localization (DFL) at the power transmission line. 
     EFFECT: increase of the technical level and possibilities of the measuring device, its simplification due to the fact, that according to the claimed method, in its programmable measuring and computing unit two single-frequency sinusoidal signals are divided. 
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