US3983456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase comparison protective relay for a transmission
Assignee: Mitsubishi Electric Corp
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Filing: 1974-06-11
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Granted: 1976-09-28
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Expires: 1994-06-11
Abstract
Abstract A phase comparison protective relay for a transmission line which comprises a current converter circuit for generating electricity corresponding to the local terminal current; a first device for transmitting a first signal during a period when the instantaneous value of said electricity is positive with respect to a predetermined positive level and for transmitting a second signal during another period; a second device for transmitting a third signal during a period when the instantaneous value of said electricity is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; a transmitter for transmitting the first and second signals to a remote terminal; a receiver for receiving the first and second signals from the remote terminal; a third device for transmitting a fifth signal when the overlapping period of the third signal and the first signal is longer than a predetermined period; a transmitter for transmitting the fifth signal to the remote terminal; a receiver for receiving the fifth signal from the remote terminal; the third device functioning to transmit the fifth signal when the overlapping period of the third signal and the fifth signal is longer than a predetermined period; and an automatic breaker connected to the transmission line which is opened by the fifth signal transmitted from the local terminal.
Inventors
- 👤 Kenji Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:59
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/302
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
586 words
A phase comparison protective relay for a transmission line which comprises: a local terminal; a remote terminal; a current converter circuit at the local terminal for generating a local signal corresponding to the local terminal current; a current converter circuit at the remote terminal for generating a remote signal corresponding to the remote terminal current; first means at the local terminal for transmitting a first signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; first means at the remote terminal for transmitting a first signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; second means at the local terminal for transmitting a third signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; second means at the remote terminal for transmitting a third signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; a transmitter for transmitting the first and second signals at the local terminal to the remote terminal; a transmitter for transmitting the first and second signals at the remote terminal to the local terminal; a receiver at the local terminal for receiving the first and second signals from the remote terminal; a receiver at the remote terminal for receiving the first and second signals from the local terminal; third means at the local terminal for transmitting a fifth signal when the overlapping period of the third signal at the local terminal and the first signal at the remote terminal is longer than a predetermined period; third means at the remote terminal for transmitting a fifth signal when the overlapping period of the third signal at the remote terminal and the first signal at the local terminal is longer than a predetermined period; said transmitter at the local terminal also functioning for transmitting the fifth signal at the local terminal to the remote terminal; said transmitter at the remote terminal also functioning for transmitting the fifth signal at the remote terminal to the local terminal; said receiver at the local terminal also functioning for receiving the fifth signal at the remote terminal from the remote terminal; said receiver at the remote terminal also functioning for receiving the fifth signal at the local terminal from the local terminal; said third transmitting means at the local terminal also functioning for transmitting the fifth signal at the remote terminal when the overlapping period of the third signal at the local terminal and the fifth signal at the remote terminal is longer than a predetermined period; said third transmitting means at the remote terminal also functioning for transmitting the fifth signal at the local terminal when the overlapping period of the third signal at the remote terminal and the fifth signal at the local terminal is longer than a predetermined period; an automatic breaker at the remote terminal connected to the transmission line, said breaker being opened by the fifth signal transmitted from the local terminal; and an automatic breaker at the local terminal connected to the transmission line, said breaker at the local terminal being opened by the fifth signal transmitted from the remote terminal.
Claim 2
Dependent Claim
586 words
A phase comparison protective relay for a transmission line which comprises: a local terminal; a remote terminal; a current converter circuit at the local terminal for generating a local signal corresponding to the local terminal current; a current converter circuit at the remote terminal for generating a remote signal corresponding to the remote terminal current; first means at the local terminal for transmitting a first signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; first means at the remote terminal for transmitting a first signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; second means at the local terminal for transmitting a third signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; second means at the remote terminal for transmitting a third signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; a transmitter for transmitting the first and second signals at the local terminal to the remote terminal; a transmitter for transmitting the first and second signals at the remote terminal to the local terminal; a receiver at the local terminal for receiving the first and second signals from the remote terminal; a receiver at the remote terminal for receiving the first and second signals from the local terminal; third means at the local terminal for transmitting a fifth signal when the overlapping period of the third signal at the local terminal and the first signal at the remote terminal is longer than a predetermined period; third means at the remote terminal for transmitting a fifth signal when the overlapping period of the third signal at the remote terminal and the first signal at the local terminal is longer than a predetermined period; said transmitter at the local terminal also functioning for transmitting the fifth signal at the local terminal to the remote terminal; said transmitter at the remote terminal also functioning for transmitting the fifth signal at the remote terminal to the local terminal; said receiver at the local terminal also functioning for receiving the fifth signal at the remote terminal from the remote terminal; said receiver at the remote terminal also functioning for receiving the fifth signal at the local terminal from the local terminal; said third transmitting means at the local terminal also functioning for transmitting the fifth signal at the remote terminal when the overlapping period of the third signal at the local terminal and the fifth signal at the remote terminal is longer than a predetermined period; said third transmitting means at the remote terminal also functioning for transmitting the fifth signal at the local terminal when the overlapping period of the third signal at the remote terminal and the fifth signal at the local terminal is longer than a predetermined period; an automatic breaker at the remote terminal connected to the transmission line, said breaker being opened by the fifth signal transmitted from the local terminal; and an automatic breaker at the local terminal connected to the transmission line, said breaker at the local terminal being opened by the fifth signal transmitted from the remote terminal.
Claim 3
Dependent Claim
108 words
The phase comparison protective relay according to claim 1 which further comprises a first delay circuit for compensating a period for transmitting a signal between the transmitter at the remote terminal and the receiver at the local terminal, said first delay circuit being disposed between the second transmitting means and the third transmitting means at the local terminal and which further comprises a second delay circuit for compensating a period for transmitting a signal between the transmitter at the local terminal and the receiver at the remote terminal, said second delay circuit being disposed between the second transmitting means and the third transmitting means at the remote terminal.
Claim 4
Dependent Claim
506 words
A phase comparison protective relay for a transmission line which comprises: a local terminal; a remote terminal; a current converter circuit at the local terminal for generating a local signal corresponding to the local terminal current; a current converter circuit at the remote terminal for generating a remote signal corresponding to the remote terminal current; first means at the local terminal for transmitting a first signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; first means at the remote terminal for transmitting a first signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; second means at the local terminal for transmitting a third signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; second means at the remote terminal for transmitting a third signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; a transmitter for transmitting the first and second signals at the local terminal to the remote terminal; a transmitter for transmitting the first and second signals at the remote terminal to the local terminal; a receiver at the local terminal for receiving the first and second signals from the remote terminal; a receiver at the remote terminal for receiving the first and second signals from the local terminal; third means at the local terminal for transmitting a fifth signal when the overlapping period of the third signal at the local terminal and the first signal at the remote terminal is longer than a predetermined period; third means at the remote terminal for transmitting a fifth signal when the overlapping period of the third signal at the remote terminal and the first signal at the local terminal is longer than a predetermined period; said transmitter at the local terminal also functioning for transmitting the fifth signal at the local terminal to the remote terminal; said transmitter at the remote terminal also functioning for transmitting the fifth signal at the remote terminal to the remote terminal; said receiver at the local terminal also functioning for receiving the fifth signal at the remote terminal from the remote terminal; said receiver at the remote terminal also functioning for receiving the fifth signal at the local terminal from the local terminal; a breaker connected to the transmission line at the local terminal, said breaker being opened by either the fifth signal at the local terminal or the fifth signal at the remote terminal; and a breaker connected to the transmission line at the remote terminal, said breaker being opened by either the fifth signal at the remote terminal or the fifth signal at the local terminal.
Claim 5
Dependent Claim
506 words
A phase comparison protective relay for a transmission line which comprises: a local terminal; a remote terminal; a current converter circuit at the local terminal for generating a local signal corresponding to the local terminal current; a current converter circuit at the remote terminal for generating a remote signal corresponding to the remote terminal current; first means at the local terminal for transmitting a first signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; first means at the remote terminal for transmitting a first signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined positive level and for transmitting a second signal during another period; second means at the local terminal for transmitting a third signal during a period when the instantaneous value of the local signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; second means at the remote terminal for transmitting a third signal during a period when the instantaneous value of the remote signal is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; a transmitter for transmitting the first and second signals at the local terminal to the remote terminal; a transmitter for transmitting the first and second signals at the remote terminal to the local terminal; a receiver at the local terminal for receiving the first and second signals from the remote terminal; a receiver at the remote terminal for receiving the first and second signals from the local terminal; third means at the local terminal for transmitting a fifth signal when the overlapping period of the third signal at the local terminal and the first signal at the remote terminal is longer than a predetermined period; third means at the remote terminal for transmitting a fifth signal when the overlapping period of the third signal at the remote terminal and the first signal at the local terminal is longer than a predetermined period; said transmitter at the local terminal also functioning for transmitting the fifth signal at the local terminal to the remote terminal; said transmitter at the remote terminal also functioning for transmitting the fifth signal at the remote terminal to the remote terminal; said receiver at the local terminal also functioning for receiving the fifth signal at the remote terminal from the remote terminal; said receiver at the remote terminal also functioning for receiving the fifth signal at the local terminal from the local terminal; a breaker connected to the transmission line at the local terminal, said breaker being opened by either the fifth signal at the local terminal or the fifth signal at the remote terminal; and a breaker connected to the transmission line at the remote terminal, said breaker being opened by either the fifth signal at the remote terminal or the fifth signal at the local terminal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |