Fault current calculation during transformer saturation using the waveform unsaturated regionLine-mounted devices for determining fault magnitude in an electric power delivery system even under current-transformer (CT) saturation are disclosed herein. Fault magnitude is calculated using unsaturated regions of ...
A transformer type superconducting fault current limiter (FCL) for electric power grids was developed utilizing a nonlinear resistor made of the second generation HTS wire. Using of the second generation HTS wire instead of the first one was found to reduce by an order the required amount of sup...
The transformer short circuit fault is presented.Based on the deformation test,chromatographic analysis,teardown analysis and calculation check,the causes of the transformer short circuit fault are put forward.The measures and suggestions are introduced.关键词: Power transformer Short circuit fault Ability...
A cumulative current converter usually consists of an annular core with a winding surrounding current-carrying conductors in which the voltages at the ends of the winding are transmitted to an evaluation circuit with differential current amplifier. According to the invention, the winding (10) has a...
According to increased gas, through fault current cause sparking, local overheating and severe overheating on transformer. Furthermore, the duration of through fault current affects dissolved gas. 展开 关键词: Power transformer insulation Oil insulation Fault currents Substations Oils Gases ...
Calculation results show that due to the existence of non-saturation stage, the fundamental amplitude of inrush current is small, however because of the influence of faulty branch the fundamental amplitude of fault current is far larger than the threshold, therefore whether internal fault of power ...
A conventional superconducting fault current limiter (SFCL) is usually only connected to a power system for fault current limitation. The study described in this paper, however, attempts to use the hybrid SFCL application to reduce the transformer inrush current. To accomplish this, this paper firs...
MD series residual current sensor (RCD/RCM) is an ideal protection device, for the detection and protection of different leakage currents/residual currents/fault currents. The RCD could quickly output alarm signal when people get an electric shock or...
of calculation; more importantly, by setting the boundary near the abnormal target frequency component according to the Fourier result, the target component can be analyzed in depth to determine the change time of the target frequency component, it is very important for transformer fault diagnosis. ...
At maximum through fault current, the spill output produced by the small percentage unbalance may be substantial. Therefore,differential protection of transformershould be provided with a proportional bias of an amount which exceeds in effect the maximum ratio deviation....