A water-tree resistance evaluation material including: a material selection selecting a candidate insulation material; a test carrying out a water tree test on a test piece having electrode holes formed on a first surface; and a candidate insulation material evaluation evaluating characteristics of the candidate insulation material, including progress and speed of a water tree. The test includes: a system and condition setting for setting a test system; a voltage application for grounding a ground-side electrode that is immersed in the ground-side aqueous solution, while applying an AC voltage to an application-side electrode that is immersed in the application-side aqueous solution; a measurement step; and a period determination for determining whether a test period has exceeded a predetermined period.

An insulation degradation monitoring device by which a degradation state of an insulator can be constantly monitored by a simple configuration, and a degradation degree can be decided. An insulation degradation monitoring device for an insulator, by which a high-voltage charging portion of an electric instrument is insulated from and supported to a grounding metal component, includes a penetration-type electric current sensor which is inserted to a connecting portion of the insulator and the grounding metal component, and detects a leakage electric current which is passed from the high-voltage charging portion through the insulator and is flowed to the grounding metal component; and a decision means which is connected to an output side of the electric current sensor, and decides a degradation degree of the insulator in accordance with a value of the leakage electric current.

Provided are an insulation detection method and apparatus for a fuel cell vehicle, and a vehicle. The method comprises: determining whether a vehicle is started; when the vehicle is started, executing the following steps: controlling a battery management system to perform the first insulation detection; detecting whether a fuel cell is started; and when the fuel cell is not started, controlling a fuel cell control unit to perform second insulation detection, wherein an insulation detection module for performing insulation detection on the fuel cell is provided in the fuel cell control unit of the vehicle.

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.

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.

A method for monitoring a resistive memory having an array of cells coupled between respective bitlines and respective wordlines. The method includes determining, by a current determining circuit, a cell current and a cell current change rate of at least one of the cells; determining, by a control circuit, whether the cell current change rate is outside of a cell current change rate predefined range; performing, by the control circuit, a predetermined action if the control circuit determination is positive; and storing, in a memory, the determined cell current at predetermined times, and to store the determined cell current change rate

The present invention provides an online monitoring circuit of the series compensation spark gap divider return circuit. Said series compensation spark gap divider return circuit includes a voltage equalization link and a voltage sampling link. Said voltage link includes the capacitor C which series said voltage equalization link. Said online monitoring circuit includes the voltage sampling input module, series compensation current input module and the compare module. Said sampling voltage input module after amplified the voltage of the two ends of the series capacitor C converts it into direct current signal.

The present description concerns a circuit (5) for monitoring the operation of a component (1) associated with equipment (3), comprising: at least one device (100) for measuring one or a plurality of physical quantities associated with the operation of the component; and a circuit for calculating a value representative of a remaining lifetime of a component, said monitoring circuit (5) being linked to the equipment.

Provided is an insulation degradation diagnosis apparatus that performs an insulation degradation diagnosis based on a partial discharge signal of an insulator, the device including: a characteristic diagram creation unit configured to create a ?-q-n characteristic diagram of a partial discharge signal of an insulator to be determined; an image creation unit configured to create a ?-q-n image having each pixel value based on each numerical value of a ?-q-n characteristic diagram; and a diagnosis unit configured to make a diagnosis on a presence or occurrence state of partial discharge in the insulator to be determined, using an insulation degradation diagnosis model which is created by learning a ?-q-n image having each pixel value based on each numerical value of a ?-q-n characteristic diagram of a partial discharge signal of an insulator for learning as training data associated with a presence or occurrence state of partial discharge.

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.