Description

AL-E740A POWER TRANSMISSION AND DISTRIBUTION TRAINING SYSTEM

1. Product Overview

The AL-E740A Power Transmission and Distribution Training System is a modular educational training platform designed for practical study of power transmission, distribution, transformer operation, protection, metering, transmission-line characteristics, and electrical faults.

The system provides practical facilities for studying no-load and load characteristics of transmission lines, Ferranti effect, efficiency, voltage regulation, power flow, symmetrical and asymmetrical faults, three-phase transformer distribution systems, over-current protection and earth-fault protection.

2. Scope of Learning

The training system shall facilitate the following experiments and studies:

1. Study of no-load test and Ferranti effect on a transmission line.
2. Load test and calculation of efficiency, regulation and power flow using the π-model of a transmission line.
3. Load test and calculation of efficiency, regulation and power flow using the short transmission-line model.
4. Study of symmetrical faults on a transmission line.
5. Study of asymmetrical faults on a transmission line.
6. Study of a three-phase transformer distribution system.
7. Study of over-current and earth-fault protection systems.

3. Main Power Supply

• AC output supply: 0–415 V, 6 A
• Input mains: 415 V AC, 50 Hz +10%

4. EMT-01 – Three-Phase Power Supply Module

The three-phase power supply module shall include:

• Four-pole MCB rated 415 V, 16 A.
• Three-phase power indication using R-Y-B indicators.
• Built-in contactor:

ü  Coil voltage: 230 V

ü  Frequency: 50 Hz

ü  Coil consumption: 11 VA

• Emergency-stop facility for emergency conditions.

5. EMT-04 – Multifunction Meter Module

The multifunction meter shall provide bidirectional electrical measurement and monitoring.

Technical Specifications

• Meter type: Bidirectional multifunction meter
• System: 3-phase, 3/4-wire
• Rated voltage: 415 VAC
• CT input: 5 A
• Display: LCD/LED
• Auxiliary supply: 230 V
• Auxiliary frequency: 45–65 Hz
• Power consumption: 5 W
• Measurements:

ü  Voltage (V)

ü  Current (I)

ü  Frequency (Hz)

ü  Power factor (PF)

ü  Apparent power (kVA)

ü  Active power (kW)

ü  Energy (kWh)

• Communication: Modbus RTU RS-485
• RTU/SCADA interface: Optional
• Provision for operation from 230 V AC
• R-Y-B-N output distribution points provided.

6. EMT-02 – Digital AC Meter Module

Quantity: 2 Nos.

Each module shall provide:

• Digital AC voltmeter:
• Range: 0–300 V AC
• Quantity: 1 No.
• Digital AC ammeter:
• Range: 0–10 A AC
• Quantity: 1 No.

7. EMT-03 – Digital DC Meter Module

Quantity: 2 Nos.

Each module shall provide:

• Digital DC voltmeter:
• Range: 0–300 V DC
• Quantity: 1 No.
• Digital DC ammeter:
• Range: 0–10 A DC
• Quantity: 1 No.

8. EMT-48 – Current Transformer Module

The module shall contain:

• Current transformers: 3 Nos.
• CT ratio: 20:1

9. EMT-62 – AC/DC Isolated Power Supply Module

Quantity: 2 Nos.

The module shall incorporate:

• Auto-transformer:
• Current rating: 2 A
• Application: voltage control
• Isolated transformer:
• Output: 0–230 V / 2 A
• Suitable for AC/DC applications.

10. EMT-68 – Ring and Radial Distribution Module

The distribution module shall include:

• Switching arrangement.
• Lamp holders: 8 Nos.
• 4 mm sockets.
• Facilities for practical study of ring and radial distribution arrangements.

11. EMT-67 – Numerical Over-Current and Earth-Fault Protection Relay

The numerical protection relay shall provide:

• Over-current protection.
• Earth-fault protection.
• Auto-reclose function.
• 9-pin D-type male connector for RTU/SCADA automation interface.
• Modbus RTU RS-485 communication interface.

12. Main Circuit / Distribution Panel Module

The main distribution panel shall provide:

• Three-phase input connection from 415 V mains / auto-transformer.
• Provision for connecting a three-phase step-down transformer.
• Provision for connecting a three-phase step-up transformer.
• Built-in small transmission-line section.
• Provision for connection of 3 CTs.
• One CT provided inbuilt.
• End-load distribution system.
• Front-panel circuit representation with clearly printed electrical symbols and circuits.

13. General Construction and Safety Features

The complete trainer shall include:

• High-quality insulated front panel.
• Clearly printed electrical circuits and symbols.
• Instruction manual.
• Heavy-duty 4 mm patch cords, approximately 1 metre length.
• High-voltage test points using 4 mm safety sockets.
• Modular rack-type construction.
• Aluminium extruded metal cabinet.
• Short-circuit protection through MCB.
• Approximate overall trainer size: 54 × 24 inches.

14. Packing List

The complete system shall include:

1. AL-E740A Transmission and Distribution Protection Trainer
2. Patch cords of different lengths.
3. AL-E277 Three-Phase Resistive Load
4. Filament lamps – 8 units
5. AL-E920 Transmission Line Model
6. AL-E295A Three-Phase Transformer – Step Down
7. AL-E295B Three-Phase Transformer – Step Up
8. AL-E295A Three-Phase Transformer – Step Down as listed in the source packing list.
9. AL-E302 Three-Phase Auto Transformer
10. RS-485 patch cable:

ü  6-pin mini-DIN male to 6-pin mini-DIN male

ü  Length up to 1.5 m

ü  Quantity: 1 No.

15. AL-E277 – Three-Phase Resistive Load, 3kW

Technical Specifications

• Rated load: 3kW
• Three control switches provided for individual phase current control.
• Each switch controls approximately 1 A current.
• Rheostats: 9 Nos.
• Rheostat current rating: 1 A
• Rheostat resistance: 440 Ω
• Rated condition: 1 A at 415 V
• Current meter provided for load measurement.
• Operating supply: 415 V, 50 Hz AC, three-phase.

Construction and Safety

• Insulated Bakelite front panel.
• Printed circuit diagrams and symbols.
• Instruction manual.
• Three-phase indication using 25 mm multi-coloured indicators.
• Heavy-duty 4 mm patch cords.
• 4 mm safety sockets for high-voltage test points.
• Metal cabinet.
• Four-pole MCB for short-circuit protection.
• Approximate size: 18 × 24 inches.
• Wheels provided for easy movement.

16. AL-E920 – Three-Phase Transmission Line Module

Scope of Learning

The module shall support:

• No-load transmission-line testing.
• Ferranti-effect study.
• Load testing.
• Efficiency calculation.
• Voltage-regulation calculation.
• Power-flow measurement.
• π-model transmission-line studies.
• Short-model transmission-line studies.
• Symmetrical fault studies.
• Asymmetrical fault studies.

Transmission-Line Simulation Components

The simulation model shall be constructed using:

• Resistors:

ü  5 Ω

ü  600 W

• Inductor:

ü  80 mH

ü  5 A

• Capacitor:

ü  0.47 µF

ü  600 V

Line Simulation

The model shall simulate:

• Medium/long transmission lines of approximately 125 km / 250 km using the π-model.
• Medium/long transmission lines of approximately 125 km / 250 km using the T-model.

Construction

• Fan-cooled tabletop arrangement.
• Designed for long operating life.
• Insulated Bakelite front panel.
• Printed circuit diagrams and symbols.
• 4 mm safety sockets for high-voltage test points.
• Heavy-duty 4 mm patch cords, approximately 1 m.
• Modular panel construction.
• Wheels for easy positioning.
• Removable covers.
• Approximate size: 30 × 16 inches.

17. AL-E295 – Three-Phase Transformer, Step Down

Scope

• Practical study of a three-phase transformer.
• Step-down transformer operation.

Technical Specifications

• AC supply: 440/220 V
• Capacity: 1.5 KVA
• Input mains: 415 V, 50 Hz +10%
• Rating: 1.5 KVA per phase
• Transformer ratio: 2:1 step-down
• 440 V tapping positions:

ü  0%

ü  0%

ü  86.6%

ü  100%

• High-insulation copper winding.
• Transformer ratings available from 1–10 kVA.

Construction and Safety

• Insulated Bakelite front panel.
• Printed circuit representation.
• Instruction manual.
• High-voltage test points with 4 mm safety sockets / BTI-15 terminals.
• Metal cabinet.
• Fuse-based short-circuit protection.
• Approximate size: 18 × 12 inches.

18. AL-E295 – Three-Phase Transformer, Step Up

Scope

• Practical study of three-phase transformer operation.
• Step-up transformer operation.

Technical Specifications

• AC supply: 220/440 V
• Capacity: 1.5 KVA
• Input mains: 415 V, 50 Hz +10%
• Rating: 1.5 KVA per phase
• The source document specifies a transformer ratio of 2:1 and labels this unit as Step Up.
• 440 V tapping positions:

ü  0%

ü  0%

ü  86.6%

ü  100%

• High-insulation copper winding.
• Transformer ratings available from 1–10 kVA.

Construction and Safety

• Insulated Bakelite front panel.
• Printed circuit diagrams.
• Instruction manual.
• 4 mm safety sockets / BTI-15 high-voltage terminals.
• Metal cabinet.
• Fuse-based short-circuit protection.
• Approximate size: 18 × 12 inches.

19. AL-E302 – Three-Phase Auto Transformer

• Practical study and operation of a three-phase Variac / auto-transformer.

Technical Specifications

• AC output: 0–415 V
• Current rating: 4 A
• Input mains: 415 V, 50 Hz +10%
• Copper-wound auto-transformer.

Construction and Safety

• Insulated Bakelite front panel.
• Printed circuit diagrams and symbols.
• Instruction manual.
• High-voltage test points with 4 mm safety sockets / BTI-15 terminals.
• Metal cabinet.
• Fuse-based short-circuit protection.
• Wheels for easy movement.
• Approximate weight: 25 kg
• Approximate dimensions: 20 × 12 inches.

20. Catalogue Presentation

The complete system is intended as a modular laboratory setup combining:

415 V Three-Phase Supply → Metering → CT Measurement → Transmission-Line Model → Transformer Step-Up/Step-Down → Distribution Network → Resistive Load → Numerical Protection Relay

The supplied source identifies the system as AL-E740A Power Transmission and Distribution Training System and specifies the complete modular rack construction and associated equipment.

Technical Details