Rogowski coil current transducer compensation method for harmonic active power error

Distributed Measuring System for Predictive Diagnosis of Uninterruptible Power Supplies in Safety-Critical Applications

“…The aim is to overcome the limitations of the state-of-the-art where fault diagnosis is usually implemented for a single type of components of an UPS system, e.g., only power transformers in [7,8, or only battery modules for energy storage in [14][15][16][42][43][44][45][46][47]. In the state-of the-art often only some types of faults are addressed, e.g., [32][33][34][35][36][37][38][39][40][41] address only electrical and In Figure 10 moving from the original cell to the last curve an increaseˆ1.6 is detected in terms of R s andˆ1.5 in terms of f c . Figure 11 shows for all the cells in a string the distribution of operating voltage after the 4 months of accelerated aging tests.…”

“…Moreover, known works often address only some types of faults: e.g., [32][33][34][35][36][37][38][39][40][41] address only electrical and thermal faults, whereas [23,28,31] address only mechanical faults through visual inspection or acoustic analysis. For diagnosis of power transformers just the measurement of some electrical parameters is foreseen in state-of-the-art such as in [34,35,39], which measure the primary or secondary currents or their ratio, or in [36], which measures the insulation dielectric losses, or in [40,41], which measure no-load power losses, or in [33], which measures the stray reactance variations.…”

“…For diagnosis of power transformers just the measurement of some electrical parameters is foreseen in state-of-the-art such as in [34,35,39], which measure the primary or secondary currents or their ratio, or in [36], which measures the insulation dielectric losses, or in [40,41], which measure no-load power losses, or in [33], which measures the stray reactance variations. Some techniques, such as those proposed in [31,40,41], cannot be implemented when the device under test (DUT) is working, but they require to switch-off the power system and to analyze the DUT in special test conditions.…”

A 3-phase current transducer based on microfluxgate sensors

“…Rogowski coils are lightweight and if made flexible they can be easily mounted on existing conductors, but they measure only AC or pulse currents since they are based on the induction law. [7]. The B-Dot sensors work on the same principle, using flat coils made of multilayer PCB [8].…”