Telephasing method and system for remotely identifying unknown p

Details Telephasing method and system for remotely identifying unknown p Telephasing method and system for remotely identifying unknown p

1985-12-30

1986-12-02

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

324 66, 324 83R, 279106, H04M 1100

Patent

active

046266224

ABSTRACT:
The telephasing method and system identify an unknown phase within a polyphase network by comparison of the unknown phase with a known reference phase of the polyphase network. The system is especially designed for carrying out the identification of the unknown phase when the reference phase is located at a point of the polyphase network far from the point where the unknown phase is located. The system comprises a first device connected to the reference phase and a second device connected to the unknown phase. The first and second devices each comprise a modem for establishing a telephone connection between the two devices. The first device includes circuitry to produce a digital signal representative of the alternating voltage of the reference phase. This representative signal is transmitted through the two modems and the telephone connection from the first to the second device. The second device comprises circuitry to produce a digital signal representative of the alternating voltage of the unknown phase. The second device is provided with circuits for compensating the transmission delay of the digital signal representative of the alternating voltage of the reference phase transmitted through the telephone connection from the first to the second device. The second device also includes a phase detection circuit for identifying the unknown phase by detecting the phase angle between the alternating voltage of the reference phase and the alternating voltage of the unknown phase.

REFERENCES:
patent: 2676208 (1954-04-01), Hampe et al.
patent: 3027513 (1962-03-01), Mulavey
patent: 3156868 (1964-11-01), Murrils
patent: 3555417 (1971-01-01), Mitchell, Sr.
patent: 3764904 (1973-10-01), Drexler
patent: 4020287 (1977-04-01), Wilkerson
patent: 4241237 (1980-12-01), Paraskevakos et al.

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