A testing system includes an AC signal generator configured to selectively generate a sinusoidal signal including a plurality of cycles. A dielectric strength and partial discharge tester sequentially performs dielectric strength and partial discharge testing of a stator of an electric machine using the sinusoidal signal. Another testing system includes an impulse signal generator configured to selectively generate an impulse signal including a plurality of cycles. A surge and partial discharge tester for sequentially performing surge and partial discharge testing of a stator of an electric machine using the impulse signal.

The present disclosure relates to a system and apparatus for monitoring a partial discharge in a switchboard, including a plurality of partial discharge sensors provided in each of a plurality of switchboards to acquire partial discharge data generated in at least one switchboard, and a noise sensor provided in any one of the plurality of switchboards to acquire noise data to be differentiated from the partial discharge data acquired from the at least one partial discharge sensor, and it can be applied to other exemplary embodiments.

Embodiments provide a magnetic shield for wireless power chargers and a method of manufacturing the same. The method includes forming flake powder having flake-type particles, forming an oxide film by performing oxygen heat treatment on the surface of the flake powder, performing insulation treatment on the surface of the flake powder provided with the oxide film formed thereon, and producing a sendust block by mixing and melting the insulation-treated flake powder and insulative resin powder. Therefore, a magnetic shield having high insulation characteristics and magnetic permeability may be provided.

In a solar power generation system, a solar battery string is connected to a PCS via an electric path. In the solar battery string, a plurality of solar battery units having a solar battery module and an optimizer that optimizes an output voltage of the solar battery module are connected in series. In an arc detection apparatus, capacitors form bypass current paths that bypass the optimizer, and an electric current sensor is provided on the electric path.

In the disclosure, the occurrence of an arc is rapidly detected while the frequency of erroneous detection is suppressed. An arc detecting apparatus includes an arc presence/absence determining part determining presence or absence of an arc based on an AC current measured by a current sensor measuring a current from a solar cell, and a repeat number setting part setting, based on a signal strength of the AC current, a repeat number of processing that the arc presence/absence determining part repeatedly performs to determine the presence or absence of the arc.

The present disclosure provides a system, apparatus and method for providing rapid shutdown for photovoltaic power systems and provides a system, apparatus and method for providing arc sensing for photovoltaic power systems. An AC current can be put on the DC bus to control PV panel shutdown. Local mean decomposition can be used to sense arcing on the DC bus.

A method of recognizing partial discharges emitted inside or outside electrical equipment after at least one partial discharge activity has been detected Partial discharge patterns are recorded beforehand in a data base, each pattern being associated with the type of fault that generated it. A new partial discharge (Pd) pattern is acquired. The new partial discharge pattern is compared with discharge patterns that are already recorded in the data base The matching fault in the equipment is obtained by deduction, and the result is recorded in the data base.

Disclosed are tantalum capacitors having enhanced volumetric efficiency, effective series resistance, effective series inductance, and high frequency performance when compared to existing tantalum capacitors. Also disclosed is a screening process for tantalum capacitors to enhance reliability.

The present invention relates to a common mode noise simulator, and more particularly, to a common mode noise simulator which removes a high-frequency component by controlling impedance of an inductor, a capacitor, and a resistor and evaluates insulation performance of a battery by measuring leakage current of the battery depending on amplitude-modulated common mode noise.

Method and system allowing more accurate detection and identification of unwanted arcing include novel processing of signal voltage representing recovered power-line current. In one implementation, arc-faults are detected based on numerical analysis where individual cycles of line voltage and current are observed and data collected during each cycle is processed to estimate likelihood of presence of arc-event within each individual cycle based on pre-defined number of arc-events occurring within pre-defined number of contiguous cycles. In another implementation, fast transient current spikes detection can be done by: computing difference values between consecutive line-current samples collected over a cycle, average of differences, and peak-to-peak value of line-current; comparing each difference value to average of difference; comparing each difference value to peak-to-peak value; and, based on calculation of composite of two comparisons, using thresholds to determine if arcing is present within processed cycle.