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CODE
GTU103
SPECIFICATIONS
ELECTRICAL POWER ENGINEERING TRAINING LABORATORY
The Electrical Power Engineering Training System must be composed of one work bench , one set of experimental modules and one set of
measuring and testing instruments.
The system must allow performance of at least the following experiments:
Protection Techniques
Instrument Transformer
Transformation ratio of a current transformer for various primary currents
Ratio error (current error ) (voltage error) concept
Test on the performance of the current transformer at over-current
Zero-phase sequence current of a three-phase system
Summation on current transformer
Demonstration of the principle of differential protection
Determination of the transformation ratio
Residual voltage in a three-phase system with a fault to ground
Measurement of the three conductor voltages on symmetrical and asymmetrical loads
Protective relays
Connection of an under/over voltage relay
Determination of the resetting ratio
Measurement of the operating time
Connection of a definite time over-current relay
Connection of an inverse time over-current relay
Measurement of the operating time of an inverse time over-current relay
Earth-fault relay study
Demonstration of an earth-fault alarm in a 3-phase network
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
Demonstration of how an earth-fault warning relay monitors the transmission line
Set of experimental modules
Metal casing
Bench-top and/or vertical panel type
Isolated panels for insertion in work frames
QTY
DL 1013T1
DL 7901TT
DL 1080TT
DL 1017R
Modules must allow connection of an electrical component,
electrical circuit or a test instrument
Modules must clearly display on front side standard diagrams using standard units and symbols.
All electrical connections must be available through safety banana connectors of 2mm for control signals and 4mm for power lines.
The minimum set of power engineering modules should include the following:
THREE-PHASE POWER SUPPLY - Didactic equipment:
three-phase variable power supply, power supply unit for variable 3-phase voltage suitable for supplying ac machines. It must provide an AC output
3-phase from 0 to 380 V, 8 A minimum.
It must be provided with a 16 A, 30 mA differential magneto-thermal main switch, a key operated
emergency push-button, start and stop push-buttons, a motor protection circuit breaker: 6.3 to 10 A, a digital ammeter and a digital switchable
voltmeter. 4 mm safety terminals for electrical connections included.
The output voltage must be set by a rotary knob with 0-100% scale.
Supply voltage:
three-phase from mains.
OVERHEAD LINE MODEL - Didactic equipment:
module with insulated panel, three-phase line model of an overhead power transmission line of 360 km long, voltage 380 kV and current 1000 A,
scale factor: 1:1000. Line resistance: 13 Q, line inductance: 290 mH, mutual capacitance: 1 uF, earth capacitance: 2 (iF, earth resistance: 11 Q, earth
inductance: 250 mH. 4 mm. safety terminal included on the front panel.
THREE-PHASE TRANSORMER - Didactic equipment:
three-phase transformer for feeding a transmission line model, 380 kV with scale factor 1:1000.
Primary: 3 x 380 V with tap at 220 V, star or delta connection.
Secondary: 3 x 220 V windings with taps at +5%, -5%, -10%, -15%,star connection for 3 x 380 V, various star connections possible.
Nominal power: 800 VA minimum.
Tertiary: 3 x 220 V windings, delta connection for stabilizing the third harmonic voltage
components, rated power: 266VA.
4 mm. safety terminal included on the front panel for the electrical connection.
RESISTIVE LOAD - didactic equipment
It must consist in a single or three-phase resistive step-variable load. Housed in a metallic box.
MECHANICAL FEATURES
The load shall be composed of a rugged metal structure and of a front metal panel.
On the front panel all the controls, the protection, the output terminals and a clear synoptic diagram, shall be collected.
ELECTRIC FEATURES
The load shall be composed of resistances, with possibility of star, delta and parallel connection, controlled by three switches. This item must be
provided also with fuses protection.
As a function of the switch positions, there shall be the following phase values:
Position Resistance Max power per phase
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1050 Ohm
46 W
2
750 Ohm
65 W
3
435 Ohm
110 W
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DL 1055TT
DL 2108TAL -SW
DL 2108T02
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300 Ohm
160 W
5
213 Ohm
230 W
6
150 Ohm
330 W
7
123 Ohm
400 W
Maximum power in single or three phase connection must be 1200 W.
Rated voltage in star connection must be 380 V, in D connection must be 220V, in single-phase must be 220V. 4 mm. safety terminal included on the
front panel for the electrical connection.
EXPERIMENT TRANSFORMER - Didactic equipment
With rotary knob to supply a set of single-phase voltages. It must also be possible to tap off three single-phase floating voltages by means of an
isolating transformer.
It must be provided with bridge rectifier for dc voltage output. With the minimum outputs: 0... 250 V / 3 A, 0 ... 42 V / 3 A, 0 ... 24 V / 6 A or 0 ... 12
V / 12 A (floating values), dc voltage: 25 A, bridge rectifier for all ranges, Output protection: 2 magneto-thermal circuit breakers, 3.5 A and 0.8 A ; 4
mm safety terminals for the electrical connection must be included.
THREE-PHASE SUPPLY UNIT - Didactic equipment:
Power supply unit for three-phase connection with 4-pole cam mains switch.
25 A current operated earth leakage circuit breaker, sensitivity 30 mA.
Triple-pole motor protection switch: 6.3 to 10 A.
Three-phase indicator lamps.
Output through 5 safety terminals:
L1, L2, L3, N and PE.
Switch for simulation of wind or photovoltaic energy power source
4 mm. safety terminal included on the front panel for the electrical connection.
POWER CIRCUIT BREAKER - Didactic equipment:
Three-phase power circuit breaker with normally closed auxiliary contact.
Features:
Contact load capability: 400 Vac, 3 A
Supply voltage: single-phase from mains
Power circuit:
Insulation voltage: 750V
Thermal current : 20A
Auxiliary contact:
Insulation voltage: 750V.
Rated current: 3A
Auxiliary power:
Single-phase voltage 220V, 50-60Hz
It must be possible to control manually the power breaker switch using the push-buttons “on”and “off” or externally via the switching contact PLC
or RELAY.
This power contacts state shall be indicated by leds:
Green led = open contacts.
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DL 2108T10
DL 2108T11
DL 2108T12
DL 2108T13
Red led = closed contacts.
While at SIGNAL OUTPUT terminals will be available a TTL level:
Low level ( 0V )= open contacts.
High level ( 5V )= closed contacts.
The RS flip-flop state shall be indicated by a led:
Yellow led = set flip-flop.
4 mm. safety terminal and 2 mm. terminals included on the front panel for the electrical connection.
It must be supplied with manual in English language
CT LOAD - Didactic equipment:
module with
insulated panel, single-phase current load transformer consisting of two separated ohmic resistors:
Fixed resistor: 0.5 Q, load 7 A
Variable resistor: 0 ... 60 Q, load 1 A
Range: 0 ... 100%
4 mm. safety terminals included on the front panel for the electrical connection.
VT LOAD -Didactic equipment:
module with
insulated panel, single-phase voltage load transformer consisting of two separated ohmic resistors:
Fixed resistor: 220 Q, load 0.5 A
Variable resistor: 330 ... 1930 Q,
4 mm. safety terminals included on the front panel for the electrical connection.
UNDER/OVER VOLTAGE TIME RELAY - Didactic equipment:
module with insulated panel, under/over voltage time relay, relay for monitoring the over-voltage and the under-voltage in an alternating threephase mains.
Max adjustable set point: 0/+20% of the rated voltage. Min adjustable set point: 0/+20% of the rated voltage.
Adjustable delay timer activated when the max. set point is exceeded.
Adjustable delay timer activated when the min. set point is exceeded.
It must be possible to connect the three-phase line 3x380V to the terminals.
One output relay with two change over contacts: (5A – 230Vac) with resistive load.
NC contacts: device not supplied or in alarm
Self-supplied by the voltage to be monitored: (380 ÷ 418)
4 mm. safety terminals and 2 mm. terminals included on the front panel for the electrical connection.
INVERSE TIME OVERCURRENT RELAY - Didactic equipment:
module with insulated panel, inverse time over-current relay, three-phase over current and earth fault relay with programmable time- current
curves suitable for protection of power distribution systems with insulated, resistance earthed or compensated neutral.
Rated input current selectable 1A or 5A, 50/60 Hz. It must be provided with three independent over current elements, three earth fault elements, a
thermal image element, a blocking output and blocking input for pilot wire selectivity coordination, a breaker failure protection, a time tagged
multiple event recording, an oscillographic wave form capture, Modbus RTU / IEC870-5-103 communication, Protocols, display LCD 16 (2x8)
characters.
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1
DL 2108T14
DL 2108T15
DL 2108T16
DL 2108T17
DL 2108T18
4 mm. safety terminals and 2 mm. terminals included on the front panel for the electrical connection.
DEFINITE TIME OVER CURRENT RELAY - Didactic equipment:
module with insulated panel, definite time over-current relay, relay for monitoring the current of a three-phase load (typically a motor) and
performing a protection with alarm. Max. adjustable set point, divided in 10 parts. Adjustable timer (0.1 ... 30 s).
The delay time must start as soon as the current exceeds the max set point. Adjustable initial timer (0.1 ... 30 s).
The timer must activate when the current exceeds 5% of the max range. Current range: 0.25 ... 5 A with direct insertion
(galvanic isolation). For currents higher than 5 A an external CT.../5 A must be used). One changeover contact: 5 A /
230 Vac with resistive load. NC contacts: device not supplied or in alarm. Supply voltage: single-phase from main. 4 mm. safety terminals and 2 mm.
terminals included on the front panel for the electrical connection.
COMBINED OVERCURRENT AND EARTH FAULT RELAY - Didactic equipment:
module with insulated panel, combined over-current & earth fault relay with programmable time-current curves suitable for protection of power
distribution systems with insulated, resistance earthed or compensated neutral.
It must be provided with three phase-fault elements, three earth fault elements, time current curves selectable according to IEC/IEEE standards, a
breaker failure protection, a trip circuit breaker control via serial port, a blocking output and blocking input for pilot wire selectivity coordination, a
time tagged multiple event recording, oscillographic wave form capture, modbus RTU / IEC870-5-103 communication Protocols, display LCD 16 (2x8)
characters, optional expansion input/output modules, rated input current selectable 1A or 5A, 50/60 Hz. 3rd harmonic filter on the neutral input
current. .
4 mm. safety terminals and 2 mm. terminals included on the front panel for the electrical connection.
SINGLE-PHASE DIRECTIONAL RELAY - Didactic equipment:
module with
insulated panel, directional relay, multifunction relay suitable for protection of HV, MV, LV power transmission and
distribution systems. Accidental earth-fault directional relay for selective protection of the power supply in isolated
neutral and earthed networks. It must be complete with Data Logger system. It must be provided with three independent over current elements,
two different thresholds for directional and non directional current with selectable trip, standard IEC Protection against switch opening failure, block
input and output, time tagged multiple event recording, oscillographic wave form capture, Modbus RTU / IEC870-5-103, display LCD 16 (2x8)
characters, switch control through serial port, communication protocol, 3rd Harmonic Filter on the neutral input current.
4 mm. safety terminals and 2 mm. terminals included on the front panel for the electrical connection.
L/C LOADS - Didactic equipment:
module with insulated panel, L/C loads, inductive and capacitive loads suitable for simulating various fault types, in order 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 uF.
Rated voltage: 450 Vac
4 mm. safety terminals included on the front panel for the electrical connection.
EARTH FAULT WARNING RELAY - Didactic equipment:
module with insulated panel, Multifunction three phase overvoltage/ undervoltage relay. Three-phase voltage relay, suitable for protection of HV,
MV, LV power transmission and distribution systems. The relay must measure the true R.M.S. value of the 3 phase to neutral voltages fed to three
transformers. It must be provided with two under voltage elements, two over voltage elements, one under frequency element, one over frequency
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DL 2109T1A
DL 2109T2A5
DL 2109T5A
DL 2109T3PV
element, one omopolar sequence over voltage element, one negative sequence over voltage element, one positive sequence under voltage
element, time tagged multiple event recording, oscillographic wave form capture, Modbus RTU / IEC870-5-103, Display LCD 16 (2x8)
characters, communication Protocol. 4 mm. safety terminals and 2 mm. terminals included on the front panel for the electrical connection.
MOVING COIL AMMETER MODULE - didactic equipment
The module must consist of a magneto-electric meter for ac and dc measurements.
Scale: 50 divisions - the scale shall made open and reasonably uniform down to about 20 percent of the full-scale reading.
Range: 100, 500 and 1000 mA, ac/dc
Accuracy class: 1.5
This module must have insulated front panel , 4 mm safety terminals, one selector and one analog meter.
The module must be supplied with manual in English language.
MOVING COIL AMMETER MODULE - didactic equipment
This module must be suitable for ac and dc current measurements.
Technical features:
•Scale: 50 divisions - the scale shall made open and reasonably uniform down to about 20 percent of the full-scale reading.
•Range: 2.5 A - 1.25 A
•Accuracy class: 1.5
•AC/DC measurements
This module must have insulated front panel, 4 mm. safety terminals, one selector and one analog meter.
The module must be supplied with manual in English language.
MOVING IRON AMMETER MODULE - didactic equipment
Electromagnetic
meter for AC and DC measurement
Scale: 50 divisions.
The scale shall be made open and reasonably uniform down to about 20% of the
full-scale reading.
□ Range: 5A.
Accuracy class: 1.5
The meter must be connected in series and carries the circuit current
This module must have insulated front panel,4 mm safety terminals and one analog meter.
The module must be supplied with manual in English language.
MOVING IRON VOLTMETER MODULE - didactic equipment
This module must be suitable for ac and dc voltage measurements.
Technical features:
•Scale: 50 divisions - the scale shall be made open and reasonably uniform down to about 20% of the full-scale reading.
•Range: 125-250-500 V
•Range changeover switch
•Accuracy class: 1.5
This module must have insulated front panel with the electrical scheme, 4 mm safety terminals, fuse protection and one analog meter. One selector
shall be included in this panel.
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2
4
DL 2109T21
DL 2109T22
DL 2109T23
DL 2109T24
DL 2109T25
DL CRON
DL BUZ
DL 2100T2
DL 2100TA
DL 1155GTU
The module must be supplied with manual in English language.
SINGLE-PHASE CURRENT TRANSFORMER - Didactic equipment:
module with insulated panel, single-phase current transformer with primary 5/1A and secondary 1A, accuracy class: 1. 4 mm safety terminals for
electrical connections included.
THREE-PHASE CURRENT TRANSFORMER - Didactic equipments:
module with insulated panel, three-phase current transformer with primary 5/1A and secondary 1A, accuracy class: 1. 4 mm safety terminals for
electrical connections included.
SINGLE -PHASE VOLTAGE TRANSFORMER - Didactic equipment:
module with insulated panel, single-phase voltage transformer with primary 380V/V3 (220V) and secondary 100 V/V3, accuracy class: 1. 4 mm
safety terminals for electrical connections included.
THREE-PHASE VOLTAGE TRANSFORMER - Didactic equipment:
module with insulated panel, three-phase voltage transformer with primary 380V/V3 (220V) and secondary 100 V/V3, accuracy class: 1. 4 mm safety
terminals for electrical connections included.
SUMMATION CURRENT TRANSFORMER - Didactic equipment:
module with insulated panel, summation current transformer with primary current 5 x 2.5 A and secondary current 1A, accuracy class: 1. 4 mm
safety terminals for electrical connections included.
Electronic stopclock with LCD display
Acoustic Continuity tester upto 1 kQ
TWO LEVEL FRAME WITH TABLE
Metal frame for fitting the modules of the laboratory.
Mounted on a bilaminated wooden top of a table.
Metal square legs with compensating feet which can be adjusted to offset the uneveness of the floor.
STORAGE CABINET
Fire varnished steel-plate, provided with shelves for module storage and key-locked doors.
Supplied with 4 rubber casters, the cabinet should be fitted under the experimental table
A set of cables with at least 80 connecting leads with security plugs of different colours, length and sections.
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