Intelligent detection method of ct secondary circuit

Abstract

The invention discloses a CT (Current Transformer) secondary circuit intelligent-detection method. The method comprises the following steps: 1) completing system initialization of a CT secondary circuit intelligent detector; 2) utilizing the CT secondary circuit intelligent detector to collect the phasor, the amplitude and the phase angle of current and voltage of a three-phase supply; 3) judging whether the phase current amplitude of one phase is zero or not; if yes, carrying out phase-zero phase-inversion judgment, namely judging which phase is inversed with a zero phase, and outputting corresponding results; and if not, entering a step 4); 4) judging whether the current amplitudes of two phases are same and meanwhile the amplitude of another phase is not zero; if not, entering a step 5); and if yes, carrying out phase-phase phase-inversion and polarity antiphase judgment, and then entering a step 7); 5) judging whether an inclined angle of two phases is less than 40 degrees and whether the amplitudes of two faulted phases are same; if yes, carrying out two-phase short-circuit judgment, judging which two phases are in short circuit, and then entering the step 7); and if not, entering a step 6); 6) judging whether the amplitudes of two non-faulted phases are same and the angles of amplitude are not same; if yes, carrying out single-phase grounding judgment, and then entering the step 7); if not, entering the step 7); and 7) displaying the judgment result and the power direction, and ending the detection.

Description

technical field [0001] The invention relates to a CT secondary circuit detection technology, in particular to a CT secondary circuit intelligent detection method. Background technique [0002] Current transformer (CT) is an important part of the power grid protection, regulation, measurement and monitoring system, and plays a vital role in the safe and stable operation of the power system. Therefore, after each power transmission, the secondary circuit of the current transformer must be checked to see if the three-phase sequence of A, B, and C is correct; to measure the power flow direction and the three-phase current phase angle is correct; to check the current amplitude To determine whether the three-phase current is balanced. To ensure the correctness of the secondary circuit wiring, so that the secondary circuit can reliably reflect the operation of the primary system. [0003] The general process of CT secondary circuit inspection: After the work preparation and safet...

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Problems solved by technology

However, the patent does not involve specific detection methods

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