the frequency response analysis (fra) test has been recognized as one of the sensitive tools available for detecting electrical and mechanical faults inside power transformers. however, there is still no universally systematic interpretation technique for these tests. many research efforts have employed different statistical criteria in order to aid the interpretative capability of the fra, but...

The early inter-turn short-circuit fault of field winding (ISFF) occurs between adjacent strands in a single rotor slot, which is significant safety hazard the transient operation large-capacity synchronous condenser. To realize high-precision detection ISFF, this paper proposes characteristics analysis method ISFF with strand as minimum unit. This combines novel stator asymmetric branch connec...

This article presents an evaluation of Prony method estimation and its implementation considerations for surge comparison test application in turn insulation diagnostics three-phase stator windings. Surge testing compares recorded voltage signals motor winding, a diagnostic is then defined with value EAR (error area ratio), which evaluates the difference between to determine diagnostic. First, ...

This paper presents a five-phase fault-tolerant permanent-magnet synchronous machine (PMSM) used for electric vehicles. In multiphase fault-tolerant PMSMs equipped with fractional-slot concentrated windings, excessive magneto-motive force (MMF) harmonics can lead to thermal demagnetization of the permanent magnets (PMs). In order to reduce the lower-order harmonics, the origins of the 2-pole ha...

An interturn short-circuit fault in the stator winding of an electric machine, denoted as turn fault, has been recognized one most severe faults permanent magnet machines, which require a swift and reliable detection, order to implement appropriate mitigations. The asymmetry brought by is widely used for detection. However, similar features also emerge less high-resistance connection (HRC) may ...

Cable winding is an alternative technology to create stator windings in large electrical machines. Today such cable winding is performed manually, which is very repetitive, time-consuming and therefore also expensive. This paper presents the design, function and control system of a developed cable feeder tool for robotized stator cable winding. The presented tool was able to catch a cable insid...

Inter-Turn Short Circuit (ITSC) fault in stator winding is a common Doubly-Fed Induction Generator (DFIG)-based Wind Turbines (WTs). Improper measures the ITSC affect safety of faulty WT and power output Farm (WF). This paper combines derating WTs optimization WF to diminish effect. At turbine level, switching strategy Fault Ride-Through (FRT) adopted ensure that safely operate under fault. far...