IT-630A Electrical Power Protection Trainer

Experiments:

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 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 the common voltage transformer circuit for measurements in three-phase network.
  • Measurements of the zero-phase sequence current of a three-phase system.
  • 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

Protective Relays Experiments:

  • Connection of an under/over voltage relay in a three-phase network and investigation on its behavior with respect to under and over-voltage.
  • Connection of an inverse time over-current relay in a three-phase network and investigation on its behavior with respect to different settings.
  • Measurement of the operating time of an inverse time over-current relay.
  • Investigation on an earth-fault relay.
  • Reaction to so-called transient earth faults.
  • Investigation on a combined over-current and earth-fault relay behavior connected in a solid earthed three-phase network.
  • Demonstration of an earth-fault alarm in a three phase network

Protection of HV Line Experiments:

  • Connection of an under/over voltage relay in a three-phase network and investigation on its behavior with respect to under and over-voltage.
  • Determination of the resetting ratio of an under/over voltage relay.
  • Measurement of the operating time of an under/over voltage relay.
  • Connection of a definite time over-current relay in a three-phase network and investigation on its behavior with respect to different settings.
  • Determination of the resetting ratio of a definite time over current relay.
  • Measurement of the operating time of a definite time over-current relay.
  • Demonstration of an earth-fault alarm in a threephase network.
  • Reaction to so-called transient earth faults.
  • Connection of an inverse time over-current relay in a three-phase network and investigation on its behavior with respect to different settings.
  • Measurement of the operating time of an inverse time over-current relay.
  • Investigation on an earth-fault relay.
  • Check of the operate time set.

Protection of HV Line Experiments:

  • Demonstration of how an under/over voltage time relay monitors the protection of a load against under-and over-voltage.
  • Demonstration of the protection of a transmission line against the Reverse Power fault.
Categories: ,

In an Electrical Power System currents and voltages must be monitored constantly to make sure that the values remain within the required limits. This will also switch off the faulty sections from the main supply network. It is important to identify the fault and to isolate the faulty section automatically from the network because this will result in collapse of the entire electrical power system. These protection systems need to be fast and reliable in events of fault in order to avoid any large-scale damage. It is important that the protection system identifies and isolates the faulty section without affecting the remaining power system. A number of protective relays are analyzed: under/over voltage time relays, definite time over-current relays, inverse time over-current relays, combined over-current and earth-fault relay, directional relay and earth-fault relays.

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