AIS spol. s r.o. Measuring and information technology for power engineering

ON-LINE EVALUATION OF LINE TRANSFER CAPACITY - AMPACITY

Features:

• The line ampacity is defined as the highest current that will not disrupt technical and safety limits.
• Continuous measurement of voltage and current synchrophasors in both line ends.
• High accuracy GPS time synchronization of measuremet.
• Off-line and on-line evaluation of series line resistance and average line temperature.
• Calculation of real line ampacity and difference above the static limit.
• Flexible addition to the existing measurements.
• PMU conforms to IEEE-C37.118 standard.

Influence of weather conditions:

Application benefits:

• Utilisation of reserve in the use of power networks.
• Use of higher line capacity particularly in the winter season.
• Saving of investments in the building of new lines.
• Use of full line ampacity in solving critical and emergency situations.

Example of line current and ampacity:

Line utilization and ampacity:

Terminal - Phasor Measurement Unit(PMU) specification:

• Stand alone unit with in-place compute functions, storage option and remote parameterization.
• Fast parallel measurements — typically 10 kHz.
• Various measurement inputs for range of instrument transformers.
• 8 inputs per terminal.
• GPS time synchronization - phase precision < 0.1°, voltage and currents precisions < 1%.
• Wide range of communication options on physical layer (Ethernet, RS-232, GSM/GPRS) and standard protocols (e.g. IEC-68570-5-101/103/104, IEEE-C37.118) implemented.
• Conforms to EMC standards for industrial environment.

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