Apparatus and method for identifying the phase of a three phase power line at a remote location
US5510700A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1993 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Oct 14, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phase identification system and method identifies the phase of a power signal at a remote location from a three-phase generator. The system has a radio transmitter which transmits a modulated representation of a voltage signal via radio frequency, and a remote field detector which receives and demodulates the transmitted signal to provide a reference signal. The field detector also includes an input probe for detecting the power signal having an unknown phase at the remote location. The field detector includes a phase comparator and a calibration phase corrector for determining the phase difference between the power signal having a known phase and the power signal having an unknown phase, thereby identifying the phase of the unknown signal at the remote location. The invention also includes a method of calibrating the phase identification system. The method includes the steps of modulating and transmitting a known phase signal, receiving and demodulating the same signal, and comparing the demodulated signal with a signal having the same phase as the known signal to determine the phase difference due to the transmitting and receiving circuitry. This phase difference constitutes th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.