December 2015 29
Distance Relays Provide Protection
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Distance Relays are used to protect transmission circuits (in addition to overcurrent relays). Distance Relays are preferred to overcurrent relays on high voltage transmission lines. They are faster, more selective, and easier to coordinate. Overcurrent…

December 2015 22
Electrical Power Systems Testing
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Electrical Power Systems Testing ensure electrical system safety, reliability, and efficiency. Electrical Power Systems are vulnerable to aging and the extreme weather events that it endures. Extreme weather such as floods, fires, snow, rain, lightning, heat waves…

December 2015 17
Lightning Arrestors – Four Classes of Protection
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Lightning Arrestors - Which of the four classes of protection should you use? Lightning arrestors protect electrical power systems from the damaging effects of lightning. There are four classes of lightning arrestors listed from least…

December 2015 09
Overvoltage Can Harm Electrical Systems
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 Overvoltage conditions can be hazardous. Surge Suppressors and Lightning Arrestors are used to protect electrical systems from overvoltage conditions or surge. They divert the overvoltage to ground. When the voltage in a circuit or part of…

December 2015 03
Voltage Relays Provide Protection
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Voltage relays provide protection for the following conditions: Low voltage conditions which can cause motors to overheat if prolonged High voltage conditions caused when certain types of generators lose their load Reverse phase rotation which…

November 2015 23
Differential Relays Provide Extra Protection
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Differential relays are used to provide protection in the following three areas: Transformers – this is the principal form of fault protection of transformers  Generators – this can provide very sensitive protection against internal faults Buses…

November 2015 11
Overcurrent Relay Benefits
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Overcurrent relays are the most common protective relay in an electrical system. They provide a time delay function for overloads They provide an instantaneous function for short circuits Some overcurrent relays can operate in one…

October 2015 27
What are Some of the Common Types of Protective Relays?
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The most common types of protective relays include: Overcurrent relays Over/under voltage relays Directional relays Distance relays Differential relays To learn more about safety, safety maintenance procedures and for a review your of company’s electrical…