Pressure monitoring system with isolating means
US4901070A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1989 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Jul 25, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/25
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric submersible pump system has a pressure monitoring device for monitoring the pressure down the hole. The pressure monitoring device has a pressure transducer whose resistance varies with the pressure. The pressure transducer is connected to ground and is supplied with a DC current that is superimposed on the AC power cable. A temperature switch is connected between the pressure transducer and the motor winding. The temperature switch is normally open, and closes when it reaches a selected temperature. The temperature is selected to be above the ambient temperature in the well and below the temperature that occurs when the motor is operating and fully warmed up. The temperature switch isolates the windings from ground when the motor is shut off and cooled down. This enables the motor winding and power cable to be checked for insulation resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.