This is a teaching unit which gives students theorical and practical experience with several industrial relays.It includes experiments investigating earth fault, overcurrent, differential, circulating current and distance numerical protection. The unit uses real industrial protection equipment and techniques, not simulation, and a variety of industrial relays specially adapted for educational use (see available relays). This unit also covers relay setting and tripping characteristics, as well as grading and discrimination under fault conditions, and it allows students to compare individual relays characteristics and simultaneous comparison of any two relays tointroduce the topic of discrimination. Instrumentation, power supplies, transformers and load resistors are incorporated in the unit and has an user-friendly desk space for users to work on. The relays are housed in modern, portable enclosures. The test unit will support up to two relays at once. These can be different relays or both the same. The relays are programmed either directly or using software, because this unit includes relays support software which enables users to program the relays modules on a suitable computer (computer no included)using software. Student connect the relays to the console by plugging leads into terminals on the front panels, thus perform experiments and practices using the unit to set test conditions and control and monitor relay behaviour. The unit and relay front panels have schematic diagrams which help users carry out and understand the experiments.
Unit designed for comprehensive investigations into the theory and practice of electrical power system protection.
This unit is common for the relays modules type “ERP” and can use one or more relays.
Anodized aluminium structure. Panels and main metallic elements in stainless steel.
Floor-standing unit enabling wide range of protection relay investigations.
It uses genuine industrial relays, not simulations, with full range of safety features incorporated throughout.
Diagrams on the unit enable students to set up and perform practices and experiments with minimal supervision.
Comprehensive controls, transformers, supplies and instrumentation.
Modern, ergonomic and practical design which includes desk space for users or students to work on, and mounting area for relays.
It is supplied with relay support software.
Selection of up-to-date numerical protection relays, specially adapted for educational use. (See available relays).
Unit controls and instrumentations specifications:
0 to 10 A variable current supply.
0 to 220 V variable voltage supply.
2 fault limiting resistors.
Timed fault application circuit breaker.
Configurable tapped transformer with delta or star secondary.
Variable three-phase load star connected.
Variable three-phase load delta connected.
2 sets of three-phase voltage transformers.
4 sets of three-phase current transformers.
Configurable transformer test circuit.
Relay test area.
Transmission line model (5 x 50 km).
Cables and accessories for normal operation.
This unit is supplied with the following manuals: Required Services, Assembly and Installation, Starting-up, Safety, Maintenance, Practices,
including unit description and procedure.