RT-TLMS Field Data and System Accuracy
Promethean Devices’ RT-TLMSs have now logged more than 3 field-years of reliable operation. Three RT-TLMS have now seen extended field service with electric power utilities in Alabama, North Carolina, and West Virginia.
A summary of Long-term system accuracy, by measured parameter, is as follows:
Phase Current: ± .85 %, or better; e.g., ± 8.5 A @ 1000 A RMS per phase
Clearance: ± .20 %, or better; e.g. ~ ± 4 cm, RMS @ 18.5 m phase-to- ground clearance
Tconductor accuracy is under study, and is being verified via high- resolution, high-accuracy IR Thermometry, and will be reported on in detail. Given that the IR camera used for verification (FLIR Systems EX 320) has a stated accuracy of ± 2 %, or ± 2 °C., preliminary results indicate an RT-TLMS Tconductor accuracy of ± 6.5 °C.
Ampacity accuracy is under study, and is being modeled and compared with Ampacity as traditionally estimated by IEEE-738 and the CIGRE Standard. Promethean Devices’ RT-TLMS estimates Ampacity using a proprietary algorithm that is entirely consistent with these two accepted Standards.
Detailed data and reports are available for both Phase Current accuracy and Clearance accuracy and can be accessed by clicking one of the links below.
