Electronic liquid level sensing device and gauge for liquid-immersed power transformers, reactors and similar equipment
US9377341B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Oct 20, 2014 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Mar 20, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2027/404
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention is a unique system for liquid-immersed transformers and reactors with complex internal thermal gradients that provides telemetry on multiple transformer or reactor conditions including: the level and volume of the liquid, the integrity of the winding clamping, the overall tank pressure, the gas pressure for gas blanketed transformers, and the condition of the breather for conservator type transformers or reactors, and the impacts from ballistics on the tank or cooling system. The present invention can be used on conservator type or gas blanketed type transformers. The liquid level can be calculated at any level in the transformer or reactor by the location of the oil pressure sensor at the bottom of the tank. The method for calculating liquid level does not require liquid temperature measurement. Average liquid temperature is calculated rather than estimated from discrete measurements, providing accurate average temperature values under all operating conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.