Transformer assembly including a first transformer stage having a plurality of first-stage transformer cells; and a second transformer stage. An input of the second transformer stage is connected to an output of the first transformer stage. A lightning impulse breakdown voltage of a transformer cell of the second stage is at least double of a lightning impulse breakdown voltage of transformer cells of the first stage.

According to one embodiment, a detection apparatus includes a pair of conductors configured to detect an electromagnetic wave occurring due to a discharge phenomenon in a target apparatus, wherein the pair of conductors are arranged in a near field region of the target apparatus in which the electromagnetic wave occurs.

Systems and methods for testing a lightning protection circuit are provided. Aspects include providing an alternating current (AC) test signal source coupled to a circuit under test, the circuit under test comprising a lightning protection circuit having a threshold voltage, a first filter, and a second filter, providing a direct current (DC) voltage supply in series with a filtering device, the filtering device coupled to the AC test signal source, providing a first capacitor coupled between the AC test signal source and the circuit under test, operating the DC voltage supply and the AC test signal source to provide a first test signal to the circuit under test, wherein the first test signal comprise a first voltage that exceeds the threshold voltage, measuring a first impedance of the circuit under test responsive to providing the first test signal, wherein the first impedance corresponds to the first filter.

An inspection system for inspecting a secondary battery cell is generally described. An example inspection system includes a thickness measurement unit, an electrical characteristics measurement unit, a print processing unit, a tab cutting unit, a mass measurement unit, a tab inspection unit and a defect selection unit. The thickness measurement unit, the electrical characteristics measurement unit, the print processing unit, the tab cutting unit, the mass measurement unit, the tab inspection unit and the defect selection unit are arranged in series, and a plurality of secondary battery cells are transferred in line throughout the inspection system.

Methods and systems for detecting partial discharge in a stator for an electric motor are provided. An exemplary method includes applying a high voltage AC sinewave input signal to the stator and energizing at least one winding therein. The method includes sensing a first resulting load signal occurring in the stator with a first device and filtering the first resulting load signal to form a first high frequency signal indicating any partial discharge (PD) voltage occurring in the stator. The method also includes sensing a second resulting load signal occurring in the stator with a second device and filtering the second resulting load signal to form a second high frequency signal indicating any partial discharge voltage occurring in the stator. Further, the method includes processing the first and second high frequency signals to form a processed signal indicating whether partial discharge occurred.

An insulation monitoring method and system for a traction battery and an apparatus are proposed to solve the problem of how to accurately predict a risk of insulation deterioration of the traction battery before the insulation deterioration occurs on the traction battery, so as to provide an early warning about failures in the traction battery. In this method, data statistics on a large amount of insulation resistance values within a long period of time are collected, and whether the traction battery has the risk of insulation deterioration is determined by analysis based on a data statistical result; and if the traction battery has the risk of insulation deterioration, alarm information is output. In this method, based on data statistical analysis performed on the large amount of insulation resistance values within a long period of time, insulation deterioration can be predicted before the insulation deterioration occurs on the traction battery. This allows a user to perform battery maintenance in time before the insulation deterioration occurs on the traction battery, so as to prevent traction battery failures.

The present disclosure provides an arcing detection device. The arcing detection device may include a detection coil and a processing circuit operably connected to the detection coil. The detection coil may be configured to detect a current variation of a system. The processing circuit may be configured to determine information of an arcing event of the system based on the current variation of the system. The information of the arcing event of the system may include a position where the arcing event occurs in the system.

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.

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.

In a method for adapting an arc sensor (35) to a position in an electrical installation system, according to the invention a specifiable number of specifiable arcs are simulated and/or produced at least at a first position in the installation system, wherein after each simulated or produced arc, at least one current curve and/or voltage curve is recorded in a measured-value recording unit (2), wherein at least one characteristic of the recorded current curves and/or voltage curves is determined and stored, and the arc sensor (35) is trained for the electrical installation system.