• Larsen And Toubro Limited

Digital Protective Relays

Larsen & Toubro Ltd offers a comprehensive range of digital protective relays manufactured by Microelettrica Scientifica SpA, Italy, for the electric utility and other industrial applications. The complete range of microprocessor based relays for the protection of high and medium voltage transmission and distribution systems including over/undercurrent, current and earth fault directional, differential, over/undervoltage, frequency, power, capacitor, generator, synchronising and load sharing, synchro-check, and DC systems is available. These relays offer a unique combination of performance, functionality and reliability. In addition to the flexibility of settings and operating curves associated with modern protective relays, Microelettrica relays offer exceptionally simple and intuitive- five button user interface; front panel or computer based programming and setting changes for easy local and remote setting, with or without a personal computer, a display visible even in brightly illuminated environments; and programmable output relays, blocking inputs and blocking over-rides. Compact with space saving design, Microelettrica relays come with comprehensive self-diagnostics features which periodically test the entire relay, and they have modular draw-out design in a variety of case styles including 19"rack panel. These relays provide real-time and recorded measurements, and event records and oscillography. Modbus protocol ensures communication compatibility with RS 485 or fibre-optic interface, and the relays conform to all IEC 255 and 1000, and IEEE C37 standards and CE directives. For these Microelettrica relays, L&T provides after-sales support in addition to application engineering support, installation and training of field personnel.