IT-630 Electrical Power Protection Trainer

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.

Description

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.

 

Features:

Module Based

Power Supplies Included

Flexibility to Perform Custom Experiments

Passive Components Included

Resistors, Capacitors and Inductors Included

Control Circuits Included

P.T. and other Passive Components Included

Protection Circuits Included

Variable three-phase power supply

Line model

Three-phase transformer

 

Description Module 630 Protection
Variable three-phase power supply IT-6000

1

Line model IT-6002

1

Three-phase transformer IT-6003

1

Resistive load IT-6004

1

Experiment transformer IT-6016

1

Three-phase power supply IT-6017

1

Power circuit breaker IT-6019

1

CT load IT-6023

1

VT load IT-6024

1

Under/over voltage time relay IT-6025

1

Inverse time over-current relay IT-6026

1

Definite time over-current relay IT-6027

1

Combined over-current and earth-fault relay IT-6028

1

Directional relay IT-6029

1

L/C loads IT-6030

1

Earth fault control relay IT-6031

1

Moving coil ammeter 0-1000mA IT-6034

4

Moving coil ammeter (1.25-205A) IT-6035

1

Moving iron ammeter (5A) IT-6036

2

Moving iron voltmeter IT-6038

4

Single-phase current transformer IT-6043

1

Three-phase current transformer IT-6044

1

Single-phase voltage transformer IT-6045

1

Three-phase voltage transformer IT-6046

1

Summation current transformer IT-6047

1

Acoustic continuity tester IT-BUZ

1

Electronics Stop clock IT-Clock

1

Base Frame IT-2L

1

Leads (Accessory) IT-ACC

1set

 

 

Experiments Included:

Instrument Transformers

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 the 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

 

Protective Relays

Connection of an under/over voltage relay in a three-phase network and investigation on its behaviour 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 behaviour 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

Connection of an inverse time over-current relay in a three-phase network and investigation on its behaviour 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

Demonstration of an earth-fault alarm in a three-phase network

Reaction to so-called transient earth faults

Investigation on a directional earth-fault relay behaviour for effective currents and on the direction of operation

Investigation on a combined over-current and earth-fault relay behaviour connected in a solid earthed three-phase network.

Demonstration of how the external blocking input works

 

Protection of HV Line

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 connected in a solid earthed network, when there is a three-phase, two-phase or single-phase short-circuit

Demonstration of how an earth-fault warning relay monitors the transmission line for an earth fault in a network with isolated neutral connection