A method and a circuit arrangement for testing and/or calibration, the circuit arrangement having a sensor electrode and a first and second circuit unit coupled thereto, the second circuit unit having a capacitor, and the sensor electrode being kept at a specified electrical target potential by the capacitor and the sensor electrode being coupled such that matching of the electrical potential is made possible. The second circuit unit is configured such that, if the electrical potential of the capacitor is outside a reference range, second circuit unit detects this event and brings the capacitor to a reference potential. For the purpose of testing and/or calibration, a reference current source is provided for injecting an adjustable reference current into the sensor electrode, a reference current injected into another circuit unit is measured, and/or a reference current is injected into different portions of the sensor electrode.

Provided is a data processing device of a high voltage direct current (HVDC) transmission system including: a measuring module measuring voltage and current at one or more points in the HVDC transmission system; a data processing part generating measured data units by using the measured values received from the measuring module; and a communication module transmitting the plurality of measured data units to the outside by using a wavelength division multiplexing method.

Provided is a data processing device of a high voltage direct current (HVDC) transmission system including: a measuring module measuring voltage and current at one or more points in the HVDC transmission system; a data processing part generating measured data units by using the measured values received from the measuring module; and a communication module transmitting the plurality of measured data units to the outside by using a wavelength division multiplexing method.

Disclosed is a discontinuous jump current breaker, in an AC power system having an insulating material that exhibits nonlinear electrical characteristics between two electrodes, which blocks an AC power by observing a discontinuous jump current in which an insulator-metal transition occurs. The discontinuous jump current breaker includes a setting unit that sets the magnitude of a discontinuous jump current, a sensor unit including a metallic wire (Republic of Korea Patent Registration No. 10-1981640) parallel to an AC power wire, located at a separation distance d?0, and that measures electromagnetic waves of an AC power, an amplifier unit that amplifies an analog signal of the metal wire, an analog-to-digital converter that converts the amplified analog signal to digital, a microcontroller unit including a memory unit for storing a program that drives the system, and a power blocking unit that blocks the discontinuous jump current.

A system and method are provided for compensating for thermal drift of a probe device. The method includes monitoring a first temperature of a laser source in a sensor head that receives output electrical signals from a DUT and outputs corresponding optical signals; monitoring a second temperature of a photoreceiver in a probe interface that converts the optical signals to electrical test signals to input to the test instrument; calculating a first value of a first bias voltage using the first temperature; applying the first value of the first bias voltage to the laser source to compensate for thermal drift when the first temperature is within a first predefined temperature range; calculating a second value of a second bias voltage for the photoreceiver using the second temperature; and applying the second value of the second bias voltage to the photoreceiver to compensate for thermal drift when the second temperature is within a second predefined temperature range.

A system and method are provided for compensating for thermal drift of a probe device. The method includes monitoring a first temperature of a laser source in a sensor head that receives output electrical signals from a DUT and outputs corresponding optical signals; monitoring a second temperature of a photoreceiver in a probe interface that converts the optical signals to electrical test signals to input to the test instrument; calculating a first value of a first bias voltage using the first temperature; applying the first value of the first bias voltage to the laser source to compensate for thermal drift when the first temperature is within a first predefined temperature range; calculating a second value of a second bias voltage for the photoreceiver using the second temperature; and applying the second value of the second bias voltage to the photoreceiver to compensate for thermal drift when the second temperature is within a second predefined temperature range.

A circuit breaker for a low-voltage circuit is disclosed. In an embodiment, the circuit breaker includes a current conductor, assigned a measuring transducer for measuring the electrical current of the current conductor; a first filter connected to the measuring transducer; an analog/digital converter connected to the first filter; a second, high-pass filter connected to the analog/digital converter; and a digital integrator, connected to the high-pass filter and configured to determine the electrical current of the current conductor.

A data processing device in a high voltage direct current (HVDC) transmission system is provided. The data processing device includes a measurement module measuring a voltage or current for one or more points in the HVDC system; a data processing unit generating measurement data units using measurement values measured at the measurement module; and a communication module using wavelength division multiplexing to transmit the measurement data units to the outside through one optical fiber, wherein the optical fiber includes a plurality of cores.

A data processing device in a high voltage direct current (HVDC) transmission system is provided. The data processing device includes a measurement module measuring a voltage or current for one or more points in the HVDC system; a data processing unit generating measurement data units using measurement values measured at the measurement module; and a communication module using wavelength division multiplexing to transmit the measurement data units to the outside through one optical fiber, wherein the optical fiber includes a plurality of cores.

An oscillator-based sensor interface circuit includes an oscillator and a switching means is arranged for switching between at least two signals to be applied to the oscillator via that input. At least one of the signals is an electrical signal representative of an electrical quantity. A counter is arranged to count a number of cycles produced by the oscillator. A control logic is arranged to control the switching means and to derive a control output signal from a first number of counted oscillator cycles. A feedback element is arranged for converting a representation of the control output signal into a feedback signal used directly or indirectly to maintain a given relation between the first number of counted oscillator cycles.