Electrical system with capacitance tap and sensor for on-line monitoring the state of high-voltage insulation and remote monitoring device
US6433557B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Feb 9, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02B11/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in electrical equipment with capacitance tap. In this arrangement, both the power frequency signal and the radio frequency signals associated with partial discharge activity are sensed. These signals are transmitted from the sensor to remote monitoring instrumentation via one connecting cable. The sensor contains a surge arrester in parallel with a capacitor shunt, a radio frequency current transformer and a connecting circuit. The polarity terminal of the primary winding of the radio frequency current transformer is connected to the tap output. The non-polarity terminal is connected to the common connection point of the surge arrester and the capacitor shunt while the second terminals of these components are connected to the local ground. The non-polarity terminal of the secondary winding of the radio frequency current transformer is connected to the non-polarity terminal of its primary winding, and the polarity terminal-to the signal conductor of the connecting circuit. The second conductor of the connecting circuit is connected to the local ground. Both the power freq…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.