The present disclosure pertains to systems and methods for monitoring a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection. A first current transformer is disposed between the stack of capacitors and the first ground connection. The current transformer provides an electrical signal corresponding to a current associated with the CCVT. A second transformer is disposed to provide a second electrical signal related to the CCVT. The second signal may be a voltage signal or a current signal. An intelligent electronic device (IED) in electrical communication with the current measurement devices monitors a health factor comprising a ratio of magnitudes or a difference between phases from the transformers at a single frequency. The health factor is compared against an acceptable range and an alarm is generated when the range is exceeded.

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.

In one embodiment, a method of forming a semiconductor device may include forming a sense resistor to receive a high voltage signal and form a sense signal that is representative of the high voltage signal. An embodiment of the sense resistor may optionally be formed overlying a polysilicon resistor. The method may also have an embodiment that may include forming a plurality of capacitors in parallel to portions of the sense resistor wherein the plurality of capacitors are connected together in series.

It is described an attenuation measurement device (100), comprising:

i) a detector unit (110) having a coupling capacitance (120), and an input capacitance (130), wherein the detector unit (110) is configured to produce a detector output signal (112a,b) in reply to an input signal received at the coupling capacitance (120) and/or at the input capacitance (130);
ii) a test unit (140), coupled to the detector unit (110), and configured to provide a test signal (141) with at least one known signal property as a first input signal to the coupling capacitance (120);
iii) a calibration unit (150), coupled to the detector unit (110), and configured to provide a calibration signal (151) as a second input signal to the input capacitance (130); and
iv) a control unit configured to
a) determine a first detector output signal (112a) produced by the detector unit (110) in response to the test signal (141),
b) identify a specific calibration signal (151) that yields a second detector output signal (112b) that is comparable to the first detector output signal (112a), and
c) derive a capacitance-indicative information based on the identified specific calibration signal (151).

A device to measure the voltage at a test point, also referred to as a test point voltage sensor, comprises a housing formed from a first material and a second material, wherein the first material comprises an insulating material and the second material comprises a conductive or semiconductive material. The housing includes an opening configured to cover a test point of a cable accessory. The device further includes a pressure pad, disposed in the housing, having a conductive mating surface configured to contact a test point of the basic insulation plug or end plug. The device further includes a low side capacitor embedded in the housing and electrically coupled to the conductive mating surface. The device further includes a signal wire electrically coupled to the low side capacitor.

A device to measure the voltage at a test point, also referred to as a test point voltage sensor, comprises a housing formed from a first material and a second material, wherein the first material comprises an insulating material and the second material comprises a conductive or semiconductive material. The housing includes an opening configured to cover a test point of a cable accessory. The device further includes a pressure pad, disposed in the housing, having a conductive mating surface configured to contact a test point of the basic insulation plug or end plug. The device further includes a low side capacitor embedded in the housing and electrically coupled to the conductive mating surface. The device further includes a signal wire electrically coupled to the low side capacitor.

A voltage detection circuit includes an inductor connected to connection portions configured to input an alternating-current voltage, an inductor magnetic-field coupled to the inductor, a capacitor connected in parallel to the inductor and constituting a secondary-side resonant circuit with the inductor, and a voltage detector configured to detect an output voltage from the secondary-side resonant circuit. Therefore, a voltage detection circuit, a power transmission device, and a power transmission system capable of detecting an alternating-current voltage with high detection sensitivity irrespective of the potential of a power transmission line are provided.

A voltage detection circuit includes an inductor connected to connection portions configured to input an alternating-current voltage, an inductor magnetic-field coupled to the inductor, a capacitor connected in parallel to the inductor and constituting a secondary-side resonant circuit with the inductor, and a voltage detector configured to detect an output voltage from the secondary-side resonant circuit. Therefore, a voltage detection circuit, a power transmission device, and a power transmission system capable of detecting an alternating-current voltage with high detection sensitivity irrespective of the potential of a power transmission line are provided.

An RC voltage divider includes a secondary part connected to a primary part. The secondary part has a coaxial build up, assembly, configuration or alignment.

An RC voltage divider includes a secondary part connected to a primary part. The secondary part has a coaxial build up, assembly, configuration or alignment.