Handling Fault Diagnosis Problem of Linear-Analogue Circuits with Voltage Phasor Measurement

Abstract EN

This paper proposes a novel method to estimatethe influence of hard-fault in linear-analogue circuit systembased on the measurement of voltage phasor with assistantbranch introduced.

Furthermore, a new fault diagnosis strategybased on the voltage phasor modeling is established, and thetolerance influence on the corresponding voltage measurementis also discussed.

The actual analogue circuit test shows usthat the proposed method is effective and reliable to locate theaccurate fault signature in voltage measurement for the faultdiagnosis.

As a matter of fact, it includes both the amplitude andphase information in a complex value form when the linear-analoguecircuit is under the AC test.

Besides, it can be alsoapplied to ambiguous groups and the sensitive test-frequenciesdetermination in the process of fault diagnosis,while the effectivenessof multifrequencies test has also been testified throughtest-frequencies sweeping investigation and the maximum errorevaluation of fault component value in the second circuit example.