Patent US5793750A successfully refreshed from Google Patents.
US5793750A
Expired / Lapsed
US
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System of communicating output function status indications between two or more power system protective relays
Assignee: Schweitzer Engineering Laboratories Inc
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Filing: 1996-05-29
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Granted: 1998-08-11
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Expires: 2016-05-29
Abstract
Abstract The communication system includes transmitting output status bits indicative of a function of the relay directly from one microprocessor-based protective relay in a power system to a second companion microprocessor-based relay. Each relay has transmit and receive modules connected by a communications link, with the transmit and receive modules using the logic output and input bits produced by the respective relays in their respective relay calculations.
Inventors
- 👤 Edmund O. Schweitzer, III
- 👤 Gary W. Scheer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:30
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/26; H02H7/261; H02J; H02J13/00; H02J13/13; H02J13/1321; H02J13/18; H02J13/34; H02J13/36; H02H1/00; H02H1/0061; H02H7/263; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S10/00; Y04S10/20; Y04S40/00; Y04S40/12; Y04S40/124
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
A system for communicating the status of output bits from one protective relay to a second protective relay in a power system, wherein the relay output bits are the result of a fault determination calculation process in the one relay which would conventionally be used to set output contacts present in said one relay, the status of which is communicated to the second relay, comprising: means at the one relay for formatting said output bits, which are representative of the result of the fault determination calculation process, into a data packet; means for directly transmitting said data packet over a communications link to said second relay, such that the results of the fault determination calculation process in said first relay, in the form of output bits, is communicated to the second relay without the use of output contacts in the first relay; and means at the second relay for receiving said data packet, verifying the validity of said data packet, obtaining the transmitted output bits from said data packet and then utilizing said obtained output bits as input bits in its own fault determination calculation process.
Claim 2
Independent Claim
186 words
A system for communicating the status of output bits from one protective relay to a second protective relay in a power system, wherein the relay output bits are the result of a fault determination calculation process in the one relay which would conventionally be used to set output contacts present in said one relay, the status of which is communicated to the second relay, comprising: means at the one relay for formatting said output bits, which are representative of the result of the fault determination calculation process, into a data packet; means for directly transmitting said data packet over a communications link to said second relay, such that the results of the fault determination calculation process in said first relay, in the form of output bits, is communicated to the second relay without the use of output contacts in the first relay; and means at the second relay for receiving said data packet, verifying the validity of said data packet, obtaining the transmitted output bits from said data packet and then utilizing said obtained output bits as input bits in its own fault determination calculation process.
Claim 3
Dependent Claim
20 words
An apparatus of claim 1, wherein the communication is between two relays, in both directions, on a power transmission line.
Claim 4
Dependent Claim
33 words
An apparatus of claim 1, wherein said one relay is on a power line and communication is in one direction to a second relay located at an upstream portion of the power system.
Claim 5
Dependent Claim
22 words
An apparatus of claim 1, including means within the transmitted data packet for verifying the validity of the data in the packet.
Claim 6
Dependent Claim
23 words
An apparatus of claim 4, wherein the validity of the data is expressed in the form of additional bits in the data packet.
Claim 7
Dependent Claim
31 words
An apparatus of claim 1, wherein the means for transmitting includes a transmit module, and wherein the means for receiving includes a receive module which receives and stores the transmitted data.
Claim 8
Dependent Claim
30 words
An apparatus of claim 1, including means for programming the protective relays to accomplish selected monitoring functions, wherein the output bits are representative of the results of said monitoring functions.
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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) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |