An insulation monitoring device, according to various embodiment of the present application, comprising an impedance formed between a power line and a ground of a system comprises, a signal generation circuit for applying a triangular wave signal to the power line through a signal measurement circuit, the signal measurement circuit for measuring a voltage difference across the detection resistor of the signal measurement circuit or a current flowing through the detection resistor when the triangular wave signal is applied to the impedance, a control circuit for obtaining an impedance value of the impedance based on at least one of the voltage difference and the current, and monitoring the impedance value.

In a first series circuit of a power supply control device, a first switch and a first resistor are connected in series. In a second series circuit, a second switch and a second resistor are connected in series. The second series circuit is connected in parallel to the first series circuit. An electric current detection circuit detects an electric current value of an electric current flowing through the first resistor. In a case where specific data is stored in a storage unit, a control unit (open failure detection unit) detects an open failure of the first switch or the second switch on the basis of the electric current value detected by the electric current detection circuit. In a case where the storage unit does not store the specific data, the control unit does not detect the open failure.

A method of monitoring a circuit having load(s) includes receiving normal-mode data from circuit breakers operating in a normal mode, transforming the normal-mode data into first display data, providing the normal-mode display data to a remote user device for display by a GUI of the user device, and receiving an external diagnostics request via the GUI of the user device for selected circuit breaker(s) to enter a diagnostics mode. In response to the external diagnostics request, an internal diagnostics request is sent to the selected circuit breaker(s). Diagnostics-mode data is received from the selected circuit breaker(s), wherein the diagnostics-mode data was obtained by the selected circuit breaker(s) operating in a diagnostics mode responsive to the internal diagnostics request. The method further includes determining second display data as a function of the diagnostic-mode data and providing the second display data to the user device for display by the user device's GUI.

Disclosed is an insulation detection circuit for voltage balance, including a bus battery, a bus positive voltage dividing circuit, a bus negative voltage dividing circuit, a differential amplification circuit and a micro controller unit (MCU) module. The bus battery is respectively connected with the bus positive voltage dividing circuit and the bus negative voltage dividing circuit, the bus positive voltage dividing circuit and the bus negative voltage dividing circuit is respectively connected with the differential amplification circuit, and the differential amplification circuit being connected with the MCU module; the bus battery is configured for supplying power to each module; the bus positive voltage dividing circuit is configured for converting a positive voltage of the bus from high voltage to detectable low voltage; the bus negative voltage dividing circuit is configured for converting a negative voltage the bus from high voltage to detectable low voltage.

Disclosed is an insulation detection circuit for voltage balance, including a bus battery, a bus positive voltage dividing circuit, a bus negative voltage dividing circuit, a differential amplification circuit and a micro controller unit (MCU) module. The bus battery is respectively connected with the bus positive voltage dividing circuit and the bus negative voltage dividing circuit, the bus positive voltage dividing circuit and the bus negative voltage dividing circuit is respectively connected with the differential amplification circuit, and the differential amplification circuit being connected with the MCU module; the bus battery is configured for supplying power to each module; the bus positive voltage dividing circuit is configured for converting a positive voltage of the bus from high voltage to detectable low voltage; the bus negative voltage dividing circuit is configured for converting a negative voltage the bus from high voltage to detectable low voltage.

The discharge detector of the present invention includes a filter circuit configured to pass a noise superimposed on the current or voltage in a predetermined frequency range; an amplifier configured to amplify a level of the noise passed through the filter circuit; and a processor configured to detect occurrence of discharge based on the noise level amplified by the amplifier. The processor is set to have a threshold related to the noise level and a determination time to determine whether discharge has occurred. The processor is capable of selectively executing either one of a discharge detection mode or a learning mode. The processor in the learning mode executes process of sampling the noise at the level of the threshold or more and resetting the value of the setting of the determination time based on a result of the sampling.

The discharge detector of the present invention includes a filter circuit configured to pass a noise superimposed on the current or voltage in a predetermined frequency range; an amplifier configured to amplify a level of the noise passed through the filter circuit; and a processor configured to detect occurrence of discharge based on the noise level amplified by the amplifier. The processor is set to have a threshold related to the noise level and a determination time to determine whether discharge has occurred. The processor is capable of selectively executing either one of a discharge detection mode or a learning mode. The processor in the learning mode executes process of sampling the noise at the level of the threshold or more and resetting the value of the setting of the determination time based on a result of the sampling.

The present invention proposes an arc detector having a multi-band frequency detection function, which divides an arc frequency band using multiple band-pass filters and detects whether or not an arc occurs in each of the divided frequency bands, thereby eliminating switching noise or power supply noise that mainly occurs in a certain frequency band, and consequently increasing the accuracy of arc detection. In addition, the arc detector of the present invention may minimize the use of expensive analog-to-digital converters and increase the accuracy of arc detection through overlapping area detection.

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.

An underwater storage tank having a flexible multilayer tank containing a working liquid is provided. The flexible multilayer tank has at least one internal electrical insulating layer in contact with the working fluid, at least one external electrical insulating layer in contact with sea water, and at least one intermediate electric conductive layer sealed between the at least one internal electrical insulating layer and the at least one external electrical insulating layer. At least one first electrical connection means is connected to the at least one intermediate electric conductive layer, the least one first electrical connection means being electrically connectable to an electrical grounded measurement instrument to assess physical integrity of the flexible multilayer tank.