An impedance measuring apparatus is disclosed. The impedance measuring apparatus includes an input current generator configured to generate a sinusoidal input signal of a carrier frequency, a first electrode configured to apply the sinusoidal input signal to an object which has an impedance, a second electrode configured to receive an amplitude modulated signal from the object, a first amplifier configured to amplify the received amplitude modulated signal and output a first amplified signal, a baseline signal subtractor configured to subtract a baseline signal generated based on the first amplified signal from the amplitude modulated signal and output a subtraction modulated signal, an analog-to-digital converter (ADC) configured to convert the subtraction modulated signal to a digital modulated signal, and an impedance measurer configured to measure the impedance based on the digital modulated signal.

A monitoring system for a multi-cell rechargeable energy storage system (RESS) that includes a plurality of battery cells is described. The monitoring system includes a sensor that is arranged to monitor one or multiple heat transfer plates thermally coupled to the plurality of battery cells, a controller is in communication with the sensor. The controller including an instruction set that is executable to monitor, via the sensor, a parameter of the heat transfer plate and detect a thermal runaway event when the parameter of the heat transfer plate exceeds a threshold. The thermal runaway event is communicated to a battery controller.

A monitoring system for a multi-cell rechargeable energy storage system (RESS) that includes a plurality of battery cells is described. The monitoring system includes a sensor that is arranged to monitor one or multiple heat transfer plates thermally coupled to the plurality of battery cells, a controller is in communication with the sensor. The controller including an instruction set that is executable to monitor, via the sensor, a parameter of the heat transfer plate and detect a thermal runaway event when the parameter of the heat transfer plate exceeds a threshold. The thermal runaway event is communicated to a battery controller.

This invention relates to a pipeline-inspecting device. More specifically, the invention relates to a pipeline-inspecting device capable of at least (i) detecting defects in the lining of the pipeline; (ii) visually marking each of the defects in the pipeline; and (iii) recording the location of each of the defects along such pipeline in a single pass. The pipeline-inspecting device includes a primary body (20) being operably movable along a pipeline, fitted with a plurality of primary contacts (40) extending radially from the primary body (20) for operably riding in contact with an internal surface of the pipeline, the contacts (40) being spaced circumferentially relative to one another through 360 degrees about the primary body (20). The device further includes one or more secondary contacts (116) for operably connecting the device to the pipeline and a plurality of marking members (66) associated with each of the respective contacts (40) for visually marking the internal surface of the pipeline in the vicinity of defects detected therein, wherein the defects are operably detected by monitoring an electrical condition change between the primary (40) and secondary contacts (116). In use, and in the event of an electrical condition change arising between one of the primary contacts (40) and the secondary contact (116), the marking member associated with that respective primary contact (40) marks the internal surface of the pipeline in the vicinity of the defect detected by such primary contact (40).

An apparatus and methods are disclosed for monitoring the operation of an electrical power-transfer system and detecting and handling hazardous and undesirable system states. In accordance with one embodiment, an electrical signal is injected into the electrical power-transfer system. During or after the injection of the electrical signal, the following arc measured, (1) an electrical property between a first sensor and a second sensor to obtain a first measurement, (2) the electrical property between the second sensor and a third sensor to obtain a second measurement, and (3) the electrical properly between the first sensor and the third sensor to obtain a third measurement. The electrical power-transfer system is determined to be in a hazardous state based on the first measurement, the second measurement, and the third measurement, and in response to the determination one or more actions are performed to correct the hazardous state.

The present invention relates to a method for estimating individual phase resistance of a motor by means of an adjustable speed drive (ASD) while the motor controlled by the ASD is running and/or is at standstill. The motor is an asynchronous motor or a synchronous motor. The invention also relates to an adjustable speed drive for executing a corresponding method.

A method for controlling a wind power installation includes measuring a grid voltage of an electrical power supply grid, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.

A method for controlling a wind power installation includes measuring a grid voltage of an electrical power supply grid, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.

A calibration arrangement for calibrating a power source includes first and second resistors with first and second resistances, respectively, which are usable in calibrating the power source. The second resistance is smaller than the first resistance and the calibration arrangement is configured to allow for a measurement of the first resistance of the first resistor. The calibration arrangement is configured to form a series connection of the first resistor and of the second resistor, to allow for at least two voltage measurements between at least two different pairs of circuit nodes of the series connection, wherein a same current is applied during the at least two voltage measurements, and to derive the second resistor with a second resistance on the basis of the at least two voltage measurements and a result of the measurement of the first resistance of the first resistor.

A calibration arrangement for calibrating a power source includes first and second resistors with first and second resistances, respectively, which are usable in calibrating the power source. The second resistance is smaller than the first resistance and the calibration arrangement is configured to allow for a measurement of the first resistance of the first resistor. The calibration arrangement is configured to form a series connection of the first resistor and of the second resistor, to allow for at least two voltage measurements between at least two different pairs of circuit nodes of the series connection, wherein a same current is applied during the at least two voltage measurements, and to derive the second resistor with a second resistance on the basis of the at least two voltage measurements and a result of the measurement of the first resistance of the first resistor.