Systems and methods for calculating power transmission line capacity
The present disclosure provides a methodology that incorporates real-time measurement of conductor temperatures and ground clearances using a transmission line monitor, coupled with information technology and data analytics, to allow utility operators to manage their transmission systems using a dynamic line rating process. Dynamic line ratings may incorporate real-time or near-real-time data of transmission line conditions in lieu of conservative assumptions, in order to more accurately assess actual transmission line performance such that more of the power conveying capacity of the existing transmission infrastructure can be accessed with continued compliance with safety requirements applicable to the transmission line system.
1. An apparatus for determining a current rating for an electrical transmission line, comprising:
at least one ground clearance monitor located on a power transmission line;
at least one line temperature monitor located on the power transmission line;
a central server computer system comprising:
a receiver configured to receive actual line clearance measurements and actual line temperature measurements from the monitors located on the power transmission line; and
a processor coupled with the receiver and configured to calculate a dynamic ampacity for the transmission line based at least in part on the line clearance, line temperature, and conductor characteristics of one or more conductors of the transmission line; and
a user system capable of displaying the dynamic ampacity for the transmission line resulting in an adjusted load-temperature relationship for the power transmission line.
2. The apparatus of claim 1 , wherein the dynamic ampacity for the transmission line is calculated using a least squares regression analysis of actual conductor temperature and line clearance measurement data pairs.
3. The apparatus of claim 2 , wherein the actual conductor temperature and line clearance measurement data pairs are received from a transmission line monitor located on the transmission line.
4. The apparatus of claim 2 , wherein the processor is further configured to calculate a relationship between actual conductor temperature and line clearance.
5. The apparatus of claim 4 , wherein the processor is further configured to calculate an effective temperature for a measured value of line clearance, and wherein the dynamic ampacity for the transmission line is based at least in part of the calculated effective temperature.
6. The apparatus of claim 1 , wherein said at least one ground clearance monitor comprises a LIDAR.
7. The apparatus of claim 1 , wherein the receiver is configured to periodically receive line clearance measurements and line temperature measurements from a plurality of transmission line monitors.
8. The apparatus of claim 7 , wherein the processor is further configured to periodically update the dynamic ampacity based on the received measurements.
9. The apparatus of claim 1 , wherein the processor is further configured to calculate an amount of additional capacity available for the transmission line.
10. The apparatus of claim 9 , wherein the processor is further configured to forecast an available ampacity for the transmission line for a future time period based on an expected temperature of the transmission line at the future time period.
11. A method for determining a current rating for an electrical transmission line, comprising:
providing at least one ground clearance monitor and at least one line temperature monitor on said power transmission line;
providing a central server computer system comprising:
receiving line clearance measurements and line temperature measurements for a transmission line; and
calculating a dynamic ampacity for the transmission line based at least in part on the line clearance, line temperature, and conductor characteristics of one or more conductors of the transmission line; and
providing said calculated dynamic ampacity for the transmission line on a user system display;
adjusting a load-temperature relationship from said power transmission line; and
managing power transmission of said power transmission line.
12. The method of claim 11 , wherein the dynamic ampacity for the transmission line is calculated using a least squares regression analysis of actual conductor temperature and line clearance measurement data pairs.
13. The method of claim 12 , wherein the actual conductor temperature and line clearance measurement data pairs are received from a transmission line monitor located on the transmission line.
14. The method of claim 12 , further comprising calculating a relationship between actual conductor temperature and line clearance.
15. The method of claim 14 , further comprising calculating an effective temperature for a measured value of line clearance, and wherein the dynamic ampacity for the transmission line is based at least in part of the calculated effective temperature.
16. The method of claim 11 , wherein said at least one ground clearance monitor comprises a LIDAR.
17. The method of claim 11 , wherein receiving the receive line clearance measurements and line temperature measurements comprises receiving the measurement periodically from a plurality of transmission line monitors.
18. The method of claim 17 , further comprising periodically updating the dynamic ampacity based on the received measurements.
19. The method of claim 11 , further comprising calculating an amount of additional capacity available for the transmission line.
20. The method of claim 11 , further comprising forecasting an available ampacity for the transmission line for a future time period based on an expected temperature of the transmission line at the future time period.