Protection relays
Numerical relays are based on the use of microprocessors. The first numerical relays were released in 1985. A big difference between conventional electromechanical and static relays is how the relays
Related Topics:
Swedish Relay Protection Company
100 Years of Relay Protection, the Swedish ABB Relay History
The next era was static or electronic relays, which were introduced in the 1960s. The present era with microprocessor based relays started in the beginning of the 1980s, where microprocessor performed
Swedish Transport Administration selects ABB for protection of power
While ABB has supplied its REO517 for protection to Trafikverket for years, this is the first time the administration has chosen ABB''s RER670 for line and transformer protection. The new technology is
What is NUS?
Nowadays we use relay designations from ANSI, IEC 60617 and IEC 61850. But I like to push for the use of the "oldies" from Sweden! You still find them a lot in relay schema, test protocols...
100 Years of Relay Protection in Sweden
Some key points: - ASEA developed the first stand-alone protection relay in 1905 and first remote controlled station in 1925. - Product development began focusing nationally but soon took a global
Protection Application Handbook
The booklet gives a basic introduction to application of protection relays and the intent is not to fully cover all aspects. However the basic philosophy and an introduction to the application problems,
Relay Protection System Implemented
"We have successfully implemented a relay protection for Energy Networks (E.ON), enhancing device management and documentation control." E.ON, is one of Sweden''s largest electricity distribution
HUGHES POWER SYSTEM Swedish Autorecloser (Recloser)
HUGHES POWER SYSTEM a Swedish manufacture of autoreclosers, reclosers and protection relays for overhead lines and substations, voltage transformers, motor operators, circuit breakers, vacuum
Protection relays — ABB Group
ABB''s smart protection technology ensures smooth and safe everyday life without blackouts. ABB released its first programmable relays based on the use of microprocessors in 1985.