Detection of humidity ingress using online common‐mode insulation impedance‐monitoring system

Tsyokhla, Igor; Griffo, Antonio; Wang, Jiabin

doi:10.1049/joe.2018.8256

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…Test results during accelerated life testing are presented in [139]. The use of a single HSCT to measure common mode insulation leakage current was first proposed in [140], and further investigated in accelerated life tests [141] and in the presence of humidity [142]. The development of the measurement equipment was also presented in [143,144].…”

Section: Condition Monitoring Of Pmsgsmentioning

confidence: 99%

Fault Detection and Condition Monitoring of PMSGs in Offshore Wind Turbines

Freire

Cardoso

2021

Machines

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Research on fault detection (FD) and condition monitoring (CM) of rotating electrical generators for modern wind turbines has addressed a wide variety of technologies. Among these, permanent magnet synchronous generators (PMSGs) and the analysis of their electromagnetic signatures in the presence of faults deserve emphasis in this paper. PMSGs are prominent in the offshore wind industry, and methods for FD and CM of PMSGs based on electromagnetic measurements are extensively discussed in academia. This paper is a concise review of FD and CM in wind turbines and PMSGs. Terminology and fundamentals of PMSG’s operation are introduced first, aiming to offer an easy read and good reference to a broad audience of engineers and data scientists. Experience and research challenges with stator winding failures are also discussed.

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Section: Condition Monitoring Of Pmsgsmentioning

confidence: 99%

Fault Detection and Condition Monitoring of PMSGs in Offshore Wind Turbines

Freire

Cardoso

2021

Machines

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Analytical Analysis and Design of an Advanced Differential-Mode Current Sensor for Insulation Monitoring for Industrial Electrical Assets

Zhang

2020

IEEE Access

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Some industrial incidents are attributed to insulation degradation of electrical assets. The leakage current can be a crucial indicator for online insulation monitoring of asset. To realize per-phase monitoring, the measurement accuracy of milliampere-level leakage current is limited by the strong load current noises. This paper proposes an advanced current sensor with a dual-core topology based on differential-mode (DM) measurement. An analytical model of magnetic field of the dual-core sensor is originally presented. It helps clarify the significances of the inner core in filtering noises and reducing the influence of system operation and cable positioning. Then, a comprehensive design procedure is fully investigated by selecting the optimal position and approach for magnetic field detection, and a high-speed and low-noise signal conditioning circuit is presented. The proposed current sensor is tested in the laboratory. Experimental results indicate that measurement errors can remain within 0.1mA in the testing scope, where the load current is up to 100A and the DM current varies from 0-7mA. The proposed sensor is further validated with superior performance compared with two commercial industrial sensors. The contribution of this paper lies in providing the analytical analysis and design of a novel DM current sensor for leakage current measurement, which achieves online per-phase insulation monitoring for industrial electrical assets.

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