Three roads to protecting lv power systems
Article Abstract:
There are three basic designs for protection of power systems. A fully rated system allows all the circuit breakers to operate independently giving reliable protection but at the cost of varying continuity of service. Selectively co-ordinated systems maximise continuity by isolating the fault at the nearest circuit breaker. This is the most expensive type of design. Series rated systems rely on the furthest breaker to protect the others. Continuity is less good than other designs but this is the cheapest method. All three systems give high levels of safety.
Publication Name: Electrical Contractor
Subject: Engineering and manufacturing industries
ISSN: 0308-7174
Year: 1992
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Monitoring means efficiency
Article Abstract:
Intelligent power monitoring networks can collect and analyse information from electrical distribution systems. Connected to a computer, they can enable fast decision making and more efficient operation. The Westinghouse impacc system comprises a series of devices linked by a robust communications network. Three devices are; the IQ Data Plus II which can replace measuring and volatge monitoring instruments, the IQ-1000 II multi-function protective relay and the Advantage starter range. The use of the system in three applications is described.
Publication Name: Electrical Contractor
Subject: Engineering and manufacturing industries
ISSN: 0308-7174
Year: 1993
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Separate lives: switchboard assembly and busbar and protective device separation is a tricky business
Article Abstract:
Separation of busbars and protective devices in control gear and switchboard assemblies can be difficult, with the official rules, updated in 1990 and defining separation methods, being open to interpretation and leading to confusion among specifiers. A guide to the specification rules is presented.
Publication Name: Electrical Contractor
Subject: Engineering and manufacturing industries
ISSN: 0308-7174
Year: 1997
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