Power Protection Trainer (EST-EPP03)

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This training system has been designed to provide the students with a fully comprehensive knowledge in Electrical Power Engineering systems. The trainer is composed of a set of modules for the simulation of the various subsystems forming a complete electrical power system, from power generation to energy utilization.

Technical Specifications

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Description

POWER PROTECTION TECHNIQUES

  • In electrical power supply systems, currents and voltages are constantly measured and monitored to ensure that they remain within certain limits.
  • In general, the current and voltage values are so high that they cannot be measured directly and special transformers have to be used to reduce these values to a level which can be measured safely and economically.
  • In this laboratory single and three-phase current and voltage transformers are studied.
  • In cases of short-circuit, for instance, the very high fault currents produced can destroy parts of the system and could often even endanger the lives of humans.
  • For these reasons, special protection systems, which must react quickly and reliably in the event of faults, have been developed in the area of electrical power distribution.
  • In this laboratory a number of protective relays are analyzed: under/over voltage time relays, definite time over-current relays, inverse time over-current relays, earth-fault relays, etc.).

Instrument Transformers Experiments

  • Determination of the transformation ratio of a current transformer for various primary currents and investigation on the influence of the load on the transformation ratio.
  • Explanation of the terms: ratio error (current error), accuracy class and rated accuracy limit factor.
  • Test on the performance of the current transformer at over-current.
  • Assembly of the common current transformer circuit for measurement on three-phase network.
  • Measurements of the zero-phase sequence current of a three-phase system.
  • Measurements on a summation current transformer.
  • Demonstration of the principle of differential protection.
  • Determination of the transformation ratio of a voltage transformer for various primary voltages and investigation on the influence of the load on the transformation ratio.
  • Explanation of the terms: ratio error (voltage error) and accuracy class.
  • Assembly of he common voltage transformer circuit for measurements in three-phase network.
  • Measurement of the residual voltage in a three-phase system with a fault to ground.
  • Assembly of a voltage transformer circuit in open delta connection.
  • Measurement of the three conductor voltages on symmetrical and asymmetrical loads.