Features:

  • Module Based
  • Power Supplies Included
  • Flexibility to Perform Custom Experiments
  • Passive Components Included
  • Resistors, Capacitors and Inductors Loads Included
  • Control Circuits Included
  • P.T. and other Passive Components Included
  • Protection Circuits Included
  • Variable three-phase power supply
  • Line model
  • Three-phase transformer

Experiments Included:

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.

Protective Relays Experiments

  • 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 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 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.
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.

List of Electrical Power Trainer

Description Module Qty
Variable Three-Phase Power Supply

  • Power supply provides variable 3-Phase Voltage
  • Key Operated Emergency Switch
  • Protection: 10 A, Direct On Line (DOL) Starter
  • Push-Button: Start, Stop and Emergency
  • Motor Protection Breaker: 10 A
  • Digital 3 phase analyzer
  • Output Adjusted by Rotary Knob
  • Output: 3 x 0-380 V @ 8 A
  • Supply voltage: Three-Phase from Mains
 IT-6000 1
Line Model

  • Simulated Length: 360km
  • Simulated Voltage: 380kV
  • Simulated Current: 1000A
  • Scale factor: 1:1000
  • Mutual capacitance: 1mF
  • Earth capacitance: 2mF
  • Line resistance: 13Ω
  • Line inductance: 290 mH
  • Earth resistance: 11Ω
  • Earth inductance: 250 mH
 IT-6002 1
Three-Phase Transformer

  • Scale Factor: 1:1000
  • Primary Input: 3 x 380 V
  • Connection Type: Star or Delta
  • Secondary Output: 3 x 220 V windings with taps at +5%, -5%, -10%, -15%
  • Star connection for 3 x 380 V various star connections possible
  • Power: 800 VA
  • Tertiary Output: 3 x 220 V windings
  • Delta connection for stabilizing the third harmonic voltage components
 IT-6003 1
Resistive Load

  • Max Load in 3-Phase: 1200 W
  • Rated voltage: 380/220V
  • Connection Type: Y/
  • Rated voltage in single-phase: 220 V
 IT-6004 1
Inductive Load

  • Max Reactive Power: 890 Var
  • Rated voltage: 380/220 V
  • Connection Type: Y/
  • Rated voltage in single-phase: 220 V
 IT-6005 1
Experiment Transformer (0-250 V @ 5 A)

Outputs:

  • Single-Phase: 0-250 V @ 3 A
  • Protection: 10A Breaker, Fuse 2.5A and Fuse 5A
  • Low voltage Single Phase:
  • 0-42 V @ 3 A
  • 0-24 V @ 6A
  • 0-12 V @ 12 A
  • DC Voltage: 50 A Rectifier for all ranges
 IT-6016 1
Three-Phase Power Supply

  • Digital 3-phase analyzer
  • Input: 3-Phase 380V
  • Output Protection: 30 A current operated earth leakage circuit breaker
  • Four-pole motor protection switch: 6.3-12 A.
  • Three-phase indicator lamps
  • Output through 5 safety terminals: L1, L2, L3, N and PE
 IT-6017 1
Power Circuit Breaker with Integrated PLC

  • PLC integrated inside
  • Contact Load: 400 VAC @ 3 A
  • Supply Voltage: Single-Phase from the mains
 IT-6019 1
CT Load

  • Load for the single-phase current transformer consisting of two separated ohmic resistors
  • Fixed resistor: 0.5 Ω, load 7 A
  • Variable resistor: 0 … 60 Ω, load 1 A
  • Range: 0 … 100%
  • Fuse Protection: 1A
 IT-6023 1
VT Load

  • Load for the single-phase voltage transformer consisting of two separated ohmic resistors
  • Fixed resistor: 220 Ω
  • Load: 0.5 A (0.5 A fuse)
  • Variable resistor: 330-1930 Ω
  • Load: 0.25 A fused
 IT-6024 1
Under/over Voltage Time Relay

  • Function: Under/Over Voltage, Phase Sequence(L1,L2,L3) and Phase Failure Detector
  • Supply: 380V
  • Delay: 0.5-30sec
  • Output Relay: 230VAC @ 5A
  • Frequency: 50/60Hz
 IT-6025 1
Definite Time Over-Current Relay

  • Single Phase inputs from the mains
  • Current Range: 0~6 A
  • Output Relay: 250VAC @ 5A
  • Adjustable operation time
  • Adjustable delay time
  • Trip Time: 0-10 sec
 IT-6027 1
Combined Over-Current and Earth-Fault Relay

  • Single phase input form the mains
  • Voltage Input: 3 X 50-100V
  • Current Input: 5/1A
  • Earth Fault Current Input: 5
  • Trip relay: 2
  • Control relay: 2
  • Type of Fault:
  • Over Current
  • Inverse Time Over Current
  • Over Current Ground
  • Negative Phase Sequence Over Current
  • Under Current
  • Circuit Breaker Failure
 IT-6028 1
Directional Relay

  • Voltage Input: 400 V
  • Current Input: 5 A
  • Frequency: 16-75Hz
  • Digital Input: 2
  • Digital Input Volt: 18-265 V
  • Trip relay: 4
  • Alarm relay: 1
  • Internal fault Relay: 1
  • Type of Fault:
  • Directional Earth Fault
  • Over Current
  • Transient Earth Fault
  • Current Unbalance
  • Phase Sequence
  • Under Current
  • Thermal Overload
  • Reverse Power
 IT-6029 1
L/C Loads

  • Suitable for insertion of fault types to trigger the single-phase directional relay.
  • Inductance: 0.1, 0.2, 0.3, 0.4 H
  • Rated voltage: 220 V, 50 Hz
  • Rated current: 0.5 A
  • Capacitance: 2, 4, 8, 16 mF
  • Rated voltage: 450 V AC
 IT-6030 1
Over/Under Voltage & Earth Fault Control Relay

  • Single phase supply from the mains
  • Voltage Input: 3 x 100 V
  • Current Input: 5/1A
  • Earth Fault Current Input: 5
  • Trip relay: 2
  • Control relay: 2

Type of Fault:

  • Over/Under Voltage
  • Over/Under Frequency
  • Earth Fault
 IT-6031 1
Moving Coil Ammeter (1000mA)

  • Range:  0-1000 mA AC
 IT-6034 4
Moving Coil Ammeter (3A)

  • Range: 0~2.5 A  AC
 IT-6035 1
Moving Iron Ammeter (5A)

  • Range:  0-5A AC
 IT-6036 2
Moving Iron Voltmeter (500V)

  • Range: 0-500V AC
 IT-6038 4
Single-Phase Current Transformer

  • Primary Current: 5/1 A
  • Secondary Current: 1 A
  • Frequency: 50 Hz – 60 Hz
 IT-6043 1
Three-Phase Current Transformer

  • Primary Current: 5/1 A
  • Secondary Current: 1 A
  • Frequency: 50 Hz – 60 Hz
 IT-6044 1
Single-Phase Voltage Transformer

  • Primary Voltage: 220V
  • Secondary Voltage 33V @ 15VA
  • Secondary Voltage 65V @ 5 VA
  • Frequency: 50 – 60 Hz
 IT-6045 1
Three-Phase Voltage Transformer

  • Primary Voltage: 380 V
  • Secondary Voltage: 33 V @ 15VA
  • Secondary Voltage: 65 V @ 5 VA
  • Frequency: 50 Hz – 60 Hz
 IT-6046 1
Summation Current Transformer

  • Primary Rated Current: 5 x 2.5 A
  • Transformation Ratio: 2.5/1
  • Secondary Rated Current: 1 A
  • Rated power: 5 VA
 IT-6047 1
Base Frame

  • 2-Level Frame
 IT-2L 1
Leads (Accessory)

  • 1 set: 120 Pcs
 IT-ACC 1set

 Expansion Module (optional):

  • Differential Transformer Relay         IT-6059   – 1Pc
  • Three Phase Current Transformer   IT-6044   – 2Pcs

Experiments with Expansion Module:

  • Definite time over current protection.
  • Inverse time over current protection.
  • Earth fault
  • Transformer differential protection.

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