US 2014/0125353 A1Published application

High performance sensor for partial discharge signal-analyzing systems

AssigneeUTILX Corporation

InventorsWen Shu, Nelson Hall

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Abstract

A capacitor component is adapted for capacitive coupling to an electrical power apparatus in which a PD is suspected, such as a shielded power cable; and an impedance transformance device has an input side connected directly to the capacitor component. Together the two components are used as a sensor to pick up and convey PD signals to a PD signal-analyzing system. Although the two components inherently form a classic high-pass RC filter, in accordance with the invention the input impedance at the capacitor side is much greater than the output impedance at the signal-analyzing system side. The effect is to pass much more of the lower frequency components of the PD signal for analysis by the PD signal-analyzing system than if the tranformance device were not included.

Claims22

Dependent claims

A PD sensor for a PD signal-analyzing system having a known coupling impedance, said sensor comprising:

a capacitor component having a predetermined capacitance for capacitive coupling to an electrical power apparatus in which a PD is suspected;
and
an impedance transformance device having an input side connected directly to the capacitor component and an output side configured for connection to a PD signal-analyzing system having a known coupling impedance, the impedance transformance device being constructed and arranged to convey a PD signal from the input side to the output side, the impedance transformance device having a first effective impedance at the input side and a second effective impedance at the output side, the first effective impedance being much larger than the second effective impedance;
whereby the capacitance of the capacitor component in combination with the first effective impedance inherently effects a low frequency filter cutoff much lower than the low frequency cutoff that would be caused by the capacitance of the capacitor component in combination with the known coupling impedance.

1 more element

A PD detection system comprising:

a signal-analyzing device for analyzing a PD signal generated in an electrical power apparatus;
a transmission line connected to the signal-analyzing device for conveying the PD signal thereto, the signal-analyzing device and the transmission line forming a signal-analyzing system having a known coupling impedance;
and
a sensor for detecting the PD signal in the electrical power apparatus and for passing the PD signal to the transmission line, the sensor having
a capacitor component having a predetermined capacitance for capacitive coupling to the electrical power apparatus to pick up the PD signal generated in the electrical power apparatus;
and
an impedance transformance device having an input side connected directly to the capacitor component and an output side configured for connection to the transmission line of the signal-analyzing system, the impedance transformance device being constructed and arranged to convey the PD signal from the input side to the output side, the impedance transformance device having a first effective impedance at the input side and a second effective impedance at the output side, the first effective impedance being much larger than the second effective impedance, and the second effective impedance being selected to match the known coupling impedance;
whereby the capacitance of the capacitor component in combination with the first effective impedance inherently effects a low frequency filter cutoff much lower than the low frequency cutoff that would be caused by the capacitance of the capacitor component in combination with the known coupling impedance

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/667,952Filed 2 Nov 2012
Published: 8 May 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G01R 15/16
Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks: using capacitive devices
G01R 31/1272
Of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or…
G01R
Measuring electric variables

Family

US 9,110,105 B2Related patent
US 2014/0125353 A1This patent

From the US filing history. Foreign family members aren’t listed.

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