Impedance assembly (120) for use in a voltage divider for sensing an AC elevated voltage of at least 1 kV of a power-carrying conductor (10) distributing electrical energy in a national grid. The impedance assembly comprises a) a PCB (170); b) a high-voltage contact (80) for connection to the power-carrying conductor; c) a first plurality of impedance elements (70) on the PCB, connected to the high-voltage contact and in series with each other such as to be operable in a first voltage divider (20) for sensing the voltage of the power-carrying conductor; and d) a second plurality of impedance elements (71) on the PCB, connected to the high-voltage contact and in series with each other such as to be operable in a second voltage divider (21) for harvesting electrical energy from the power-carrying conductor.

A non-contact electric potential meter system to determine voltage between an AC conductor and a reference potential without direct electrical contact to the conductor. A housing provides a shielded measurement region that excludes other conductors and holds power supply means; an AC voltage sensing mechanism includes a conductive sense plate and an electrical connection to the reference potential. Waveform-sensing electronic circuitry obtains an AC voltage waveform induced by capacitive coupling between the conductor and the conductive sense plate. Capacitance-determining electronic circuitry obtains a scaling factor based on the coupling capacitance formed between the conductor and the conductive sense plate. Signal processing electronic circuitry uses the AC voltage waveform and the coupling capacitance-based scaling factor to obtain the voltage between the conductor and the reference potential.

A voltage source device, including a first voltage source configured to output a first voltage, source pathways to connect the first voltage source to a device under test, sensing pathways electrically coupled to the device under test; and circuitry configured to sample a second voltage at the device under test, determine a voltage difference between the first voltage and the second voltage, and adjust the first voltage based on the difference between the first voltage and the second voltage.

A voltage source device, including a first voltage source configured to output a first voltage, source pathways to connect the first voltage source to a device under test, sensing pathways electrically coupled to the device under test; and circuitry configured to sample a second voltage at the device under test, determine a voltage difference between the first voltage and the second voltage, and adjust the first voltage based on the difference between the first voltage and the second voltage.

A system and method for compensating for drift in a switch gear voltage sensor. The system includes a circuit, and an electronic processor. The circuit is configured to receive a first signal from a first capacitor of the voltage sensor and receive a second signal from a second capacitor of the voltage sensor. The circuit is further configured to generate a third signal and a fourth signal based on the first signal and the second signal. The electronic processor is configured to receive the third signal and the fourth signal and determine an angular frequency, a phase difference, a resistance value, a voltage across a compensation capacitor, an initial gain, a capacitance of the second capacitor, a capacitance and a voltage of the compensation capacitor, and a final gain.

A system and method for compensating for drift in a switch gear voltage sensor. The system includes a circuit, and an electronic processor. The circuit is configured to receive a first signal from a first capacitor of the voltage sensor and receive a second signal from a second capacitor of the voltage sensor. The circuit is further configured to generate a third signal and a fourth signal based on the first signal and the second signal. The electronic processor is configured to receive the third signal and the fourth signal and determine an angular frequency, a phase difference, a resistance value, a voltage across a compensation capacitor, an initial gain, a capacitance of the second capacitor, a capacitance and a voltage of the compensation capacitor, and a final gain.

According to one embodiment, a sensor includes a base including a first face, and a first structure body fixed to the first face. The first structure body includes first and second support portions, a first movable portion, and a first fixed electrode, The first support portion is fixed to the first surface. The second support portion is fixed to the first face and provided around the first support portion. The first movable portion is supported by the first and second support portions and apart from the base. The first fixed electrode is fixed to the first face. The first movable portion includes a first movable electrode and a first conductive member. A first current is configured to flow the first conductive member. The first fixed electrode faces the first movable electrode. A first gap is provided between the first fixed electrode and the first movable portion.

According to one embodiment, a sensor includes a base including a first face including a first face region, and a first structure body fixed to the first face region. The first structure body includes a first support portion fixed to the first face region, a second support portion fixed to the first face region, a first movable portion, and a first fixed electrode fixed to the first face region. The first movable portion is supported by the first and second support portions and apart from the base in a first direction crossing the first face region. The first movable portion includes a first movable electrode facing the first fixed electrode, and a first conductive member. A first current flows the first conductive member along a second direction crossing the first direction. A first gap is provided between the first fixed electrode and the first movable portion.

Techniques, systems and articles are described for monitoring electrical equipment of a power grid and predicting likelihood failure events of such electrical equipment. In one example, a cable accessory is configured to couple to an electrical power cable and includes a partial discharge sensor and a communications unit. The partial discharge sensor is configured to detect partial discharge events and output data indicative of the partial discharge events. The communications unit is configured to output event data based at least in part on the partial discharge data.

A sensor for a separable connector comprises a plug body comprising an insulating resin, the plug body configured to be inserted into the separable connector to encase a high voltage conductor disposed in the separable connector. The sensor also includes one or more high voltage capacitors encased by the insulating resin and configured to be electrically coupled to the separable connector at a first end portion when the plug body is inserted and one or more low voltage capacitors electrically coupled in series to the one or more high voltage capacitors to form a capacitive voltage divider. The sensor also includes a low voltage connection configured to provide a low voltage signal corresponding to a high voltage signal present in the separable connector, the low voltage connection comprising a coaxial contact having a first metal contact and a second metal contact.