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

FAULT LOCALIZATION

Features:

• Continuous measurement of voltage and current synchrophasors by Phasor Measurement Units (PMUs).
• Wide-area simultaneous measurement in multiple places of distribution power network in all three phases.
• High accuracy GPS time synchronization of measurement.
• Continuous data transfer via WAN to central station.
• Addition of synchrophasors measurements to the offline fault location algorithm.
• Various fault location calculation algorithms were tested and further development is being performed.

Typical measurement scheme:

Application benefits:

• Significant improvement of fault location algorithm.
• Exact fault location leads to cost-effective fault solution.
• Limitation on non-delivery time.
• Improved economy of power supply.
• Exact calculation also in complicated cases:
  • non-symmetrical lines,
  • effect of side supplying,
  • T - branches,
  • parallel lines with mutual inductive couplings,
  • fault resistance.

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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