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.

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.

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.

An interferometric radioimager provides real-time, high-fidelity radioimaging of high voltage breakdown (HVB) both internal and external to electrical components at sub-nanosecond and sub-millimeter resolution and has an ability to resolve multiple/spatially-extensive HVB simultaneously. Therefore, radioimaging can be used to screen for early life weakness/failure and enable non-destructive screening of defective electrical components. In particular, radioimaging can detect precursors to catastrophic HVB, allowing for early detection of weakness in critical electrical components. Radioimaging can also be used to track HVB and pinpoint defects in electrical components real time, including transformers, capacitors, cables, switches, and microelectronics.

A partial discharge detection apparatus for detecting partial discharge in a power cable and recognizing an insulation deterioration state of the power cable. A low-speed AD converter converts an analog signal of an AC waveform flowing through a power cable into a digital signal. A high-speed AD converter converts an analog signal of a partial discharge current into a digital signal. The partial discharge is detected based on the maximum value or the sum of a current value obtained from the digital signal of the partial discharge current obtained by the conversion of the high-speed AD converter, for each phase of the AC waveform, which is obtained from the digital signal of the AC waveform flowing in the power cable. The digital signal is obtained by the conversion of the low-speed AD converter.

A partial discharge detection apparatus for detecting partial discharge in a power cable and recognizing an insulation deterioration state of the power cable. A low-speed AD converter converts an analog signal of an AC waveform flowing through a power cable into a digital signal. A high-speed AD converter converts an analog signal of a partial discharge current into a digital signal. The partial discharge is detected based on the maximum value or the sum of a current value obtained from the digital signal of the partial discharge current obtained by the conversion of the high-speed AD converter, for each phase of the AC waveform, which is obtained from the digital signal of the AC waveform flowing in the power cable. The digital signal is obtained by the conversion of the low-speed AD converter.

An electrical circuit for connecting an electrical measurement device (16), which is used to measure partial discharges in a power grid having an operating voltage in the range of 1-69 kV, and which has an A/D converter (17) for converting a measured voltage pulse into a digital signal and has a microprocessor unit (18) for evaluating the digital signal, with a measurement output of a capacitive voltage testing system (3) of switchgear for the power grid having the operating voltage in the range of 1-69 kV. The electrical circuit (8) has a frequency response matching resistor (9) which is connected between an input line (10) for connection to the live pole of the measurement output and to ground, and has a high-pass filter (11) connected down-circuit of the frequency response matching resistor (9).

A detecting circuit for a panel adapted for detecting a panel which has a grounding loop is disclosed. The detecting circuit for a panel includes a first switch and a first multiplexer. The first switch is electrically connected to the grounding loop and a first ground terminal. The first switch is off in a detecting mode and on in a protection mode. The first multiplexer is electrically connected to the grounding loop and a second ground terminal. In the detecting mode, the current path between a first signal terminal of the first multiplexer and the grounding loop is conducted by the first multiplexer. In the protection mode, the current path between the second ground terminal and the grounding loop is conducted by the first multiplexer.

A detecting circuit for a panel adapted for detecting a panel which has a grounding loop is disclosed. The detecting circuit for a panel includes a first switch and a first multiplexer. The first switch is electrically connected to the grounding loop and a first ground terminal. The first switch is off in a detecting mode and on in a protection mode. The first multiplexer is electrically connected to the grounding loop and a second ground terminal. In the detecting mode, the current path between a first signal terminal of the first multiplexer and the grounding loop is conducted by the first multiplexer. In the protection mode, the current path between the second ground terminal and the grounding loop is conducted by the first multiplexer.

A ground-loss detection circuit for an integrated circuit, (IC) device including a first dynamic threshold metal oxide semiconductor (DTMOS) device operably coupled between a first ground plane of the IC device and at least one further ground plane of the IC device, at least one of the first and at least one further ground planes comprising an external ground connection of the IC device, at least one further DTMOS device operably coupled between the first and at least one further ground planes of the IC device in an opposing manner to the first DTMOS device, and at least one ground-loss detection component operably coupled to at least one of the first and at least one further DTMOS devices and arranged to detect a ground-loss for at least one of the first and at least one further ground planes based at least partly on a drain current of the at least one of the first and at least one further DTMOS device(s).