AL-E319D NUMERICAL OVER CURRENT PROTECTION RELAY TRAINER

Description

AL-E319D NUMERICAL OVER CURRENT PROTECTION RELAY TRAINER

           AL-E319D NUMERICAL OVER CURRENT PROTECTION RELAY TRAINER

AL-E319D

1. Product Overview

The AL-E319D Numerical Over Current Relay Protection Relay Trainer is a modular, rack-mounted training system designed for practical study and experimentation on numerical protection relays and three-phase power-system protection.

The trainer provides facilities for studying DMT/IDMT under-current and over-current protection, earth-fault protection and negative-sequence over-current protection. It incorporates a three-phase power supply, current and potential transformer modules, digital measurement modules, multifunction metering, a numerical protection relay, tripping indication and a three-phase current-source arrangement.

2. Scope of Learning / Experiments

The trainer shall provide facilities for performing the following experiments:

1.                Study and testing of DMT/IDMT under-current and over-current protection.

2.                Study and testing of earth-fault protection.

3.                Study and testing of negative-sequence over-current protection.

4.                Study of numerical protection relay operation.

5.                Study of relay tripping and indication.

6.                Study of relay auto-reclose function.

7.                Study of relay setting and communication with a PC.

8.                Study of RTU/SCADA interfacing through the available communication interface.

3. Detailed Technical Specifications

A. Power Supply

B. Three-Phase Power Supply Module

The trainer shall incorporate a dedicated Three-Phase Power Supply Module (415 V, 50 Hz).

Features

·                  Three-phase R-Y-B supply arrangement.

·                  MCB protection.

·                  Emergency-stop facility.

·                  Individual phase indication.

·                  R-Y-B indicator lamps.

·                  Clearly identified input/output terminals.

·                  Safety test points using appropriate safety sockets.

·                  Suitable isolation and protection for laboratory operation.

C. Multifunction Meter Module

A digital multifunction meter shall be provided for monitoring electrical parameters.

Measurement Parameters

·                  Voltage (V)

·                  Current (I)

·                  Power factor (PF)

·                  Frequency (Hz)

Power Factor Measurement

The specified measurement range shall cover:

·                  0.2 lag

·                  Unity

·                  0.2 lead

The multifunction meter shall be mounted on the front panel for convenient observation during experiments.

D. Digital AC Meter Module

A dedicated digital meter module shall be provided for AC measurements.

Digital AC Voltmeter

·                  Digital AC voltage measurement.

·                  Front-panel display.

·                  Clearly identified input terminals.

Digital AC Ammeter

·                  Digital AC current measurement.

·                  Front-panel display.

·                  Clearly identified input terminals.

The digital meters shall permit monitoring of the electrical quantities during protection experiments.

4. Current Transformer Module

The trainer shall include a dedicated Current Transformer (CT) Module.

Specification

·                  Number of CT units: 3 Nos.

·                  Suitable for three-phase current measurement and protection experiments.

·                  CT connections shall be brought to accessible front-panel terminals.

·                  Terminals shall be clearly marked for safe experimental connections.

The three CTs shall facilitate the study of phase-current measurement and numerical over-current/earth-fault protection.

5. Potential Transformer Module

A dedicated Potential Transformer (PT) Module shall be provided.

Specification

·                  Number of PT units: 3 Nos.

·                  Three-phase voltage sensing arrangement.

·                  Accessible front-panel terminals.

·                  Suitable for voltage measurement and protection-relay applications.

6. Tripping Indication Module

The trainer shall incorporate a visual tripping indication system.

Specification

·                  Lamp holder: 230 V

·                  Quantity: 2 Nos.

·                  Suitable for indicating relay/protection operating conditions.

·                  Clearly identified on the front panel.

The indication system shall allow the student to observe the operation/tripping status of the protection system.

7. Numerical Protection Relay Module

The trainer shall incorporate a numerical protection relay for protection experiments.

Protection Functions

The relay shall support:

·                  Over-current protection

·                  Earth-fault protection

Additional Relay Function

·                  Auto-reclose function

Communication Interface

The relay shall provide:

·                  9-pin D (Male) connector for interface with RTU/SCADA automation.

·                  Modbus RTU RS-485 interface for RTU/SCADA communication.

The relay shall be suitable for practical study of numerical protection, relay settings, tripping and automation interface.

8. Three-Phase Current Source Module

A dedicated three-phase current-source section shall be incorporated for protection-relay testing.

Specification

·                  Three-phase current-source arrangement.

·                  Circuit provided for OCR relay testing.

·                  Suitable for injecting/testing current conditions required for over-current protection experiments.

·                  Front-panel connections for convenient experimental wiring.

9. Protection and Safety Features

The trainer shall incorporate appropriate laboratory protection provisions including:

·                  MCB-based short-circuit protection.

·                  Emergency-stop facility.

·                  Clearly identified phase terminals.

·                  Safety test points.

·                  4 mm safety sockets for high-voltage test points.

·                  Properly insulated front panel.

·                  Modular construction.

·                  Clearly printed electrical circuits and symbols.

·                  Protected internal wiring.

10. Construction

The trainer shall be constructed as a modular rack-type system.

Mechanical Construction

·                  Modular rack-type cabinet.

·                  Aluminium extruded metal construction.

·                  Robust laboratory-grade enclosure.

·                  Front panel with printed circuit diagrams and symbols.

·                  Components arranged for easy access and observation.

·                  Suitable for repeated educational laboratory use.

Approximate Dimensions

42" × 24"

11. Front Panel

The front panel shall be professionally laid out and shall include:

·                  Three-phase supply section.

·                  MCB.

·                  Emergency-stop switch.

·                  R-Y-B indicators.

·                  Digital AC voltmeter.

·                  Digital AC ammeter.

·                  Multifunction meter.

·                  CT connections.

·                  PT connections.

·                  Numerical protection relay.

·                  Tripping indication lamps.

·                  Three-phase current-source connections.

·                  Relay communication interface.

·                  Safety terminals and patch points.

The electrical circuits and symbols shall be clearly printed on the panel for easy understanding of the protection scheme.

12. Interconnection Accessories

The trainer shall be supplied with:

·                  4 mm heavy-duty patch cords

·                  Patch-cord length: 1 metre

·                  Safety sockets for high-voltage test points.

·                  Necessary interconnection provisions between the modules.

13. PC / Relay Communication

The trainer shall support computer-based relay communication.

Communication Accessories

·                  RS232 port for PC communication.

·                  Relay-setting software supplied on CD.

·                  RS232-to-USB converter for USB interface.

RTU / SCADA Interface

The relay shall provide:

·                  9-pin D (M) connector.

·                  Modbus RTU RS-485 interface.

·                  Provision for RTU/SCADA integration and automation studies.

14. Salient Features

·                  Numerical over-current and earth-fault protection trainer.

·                  DMT/IDMT protection experimentation.

·                  Under-current and over-current protection study.

·                  Earth-fault protection study.

·                  Negative-sequence over-current protection study.

·                  Numerical relay with auto-reclose function.

·                  Three CT units.

·                  Three PT units.

·                  Digital AC voltage and current measurement.

·                  Multifunction electrical parameter meter.

·                  Three-phase current-source circuit for OCR testing.

·                  MCB short-circuit protection.

·                  Emergency-stop facility.

·                  R-Y-B phase indication.

·                  4 mm safety sockets.

·                  Heavy-duty 4 mm patch cords.

·                  RS232 PC communication.

·                  Modbus RTU RS-485 interface.

·                  RTU/SCADA interfacing capability.

·                  Modular aluminium rack construction.

·                  Printed electrical circuits and symbols.

·                  Approximate size: 42" × 24".

15. Packing List

The supplied system shall include:

1.                AL-E319D Over Current Protection Relay Trainer

2.                Patch cords

3.                3-Phase Resistive Load Unit

4.                Filament lamps – 2 Units

5.                Relay communication accessories as specified.

AL-E277A 3-PHASE RESISTIVE LAMP LOAD

16. General Description

The AL-E277A 3-Phase Resistive Lamp Load is an associated resistive-load unit intended for use with the protection-relay trainer for practical loading and protection experiments.

17. Technical Specifications

18. AL-E277A Control Arrangement

The load unit shall provide:

·                  15 control switches.

·                  Individual current control through the switches.

·                  Each switch controls approximately 400 mA current.

·                  15 bulbs mounted inside the cabinet.

·                  Three-phase indication.

·                  Front-panel load connections.

·                  Optional current meter for load measurement.

19. Construction & Safety Features

·                  Front panel constructed using high-class insulated Bakelite sheet.

·                  Circuit diagrams and symbols clearly printed.

·                  4 mm heavy-duty patch cords.

·                  High-voltage test points provided with 4 mm safety sockets.

·                  Metal cabinet construction.

·                  Short-circuit protection through 4-pole MCB.

·                  Three-phase indications using 25 mm multi-coloured indicators.

·                  Wheels provided for easy movement.

20. Complete System Configuration

The proposed protection training system therefore comprises:

Note: The specifications above are structured from the specifications you supplied. Where the source does not state an exact electrical rating, relay model, CT/PT ratio, current-source range, accuracy, dimensions of individual modules, or software version, those values have not been invented.

Technical Details