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on May 23, 2017

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Electrical diagram

Electrical diagram A wiring diagram is a simple visual representation of the physical connections and layout of an electrical system. A circuit diagram ( electrical diagram , elementary diagram, electronic schematic ) is a graphical representation of an electrical circuit.

8 typical transformer protection schemes with correctly selected relays Protection schemes and relays selection

8 typical transformer protection schemes with correctly selected relays Protection schemes and relays selection This article shows application hints for typical transformer protection schemes where SIPROTEC 4 relays are used. Let’s see the most typical transformer applications and their protection schemes: 8 typical transformer protection schemes with correctly selected relays Small transformer infeedLarge or important transformer infeedDual infeed with single transformerParallel incoming transformer feedersParallel incoming transformer feeders with bus tieThree-winding transformerAutotransformerLarge autotransformer bank 1. Small transformer infeed Earth faults on the secondary side are detected by current relay 51N . However, it has to be time-graded against downstream feeder protection relays. The restricted earth-fault relay 87N can optionally be applied to achieve fast clearance of earth faults in the transformer secondary winding. Relay ...

Conduit wiring

What is a conduit wiring? An electrical conduit is a tube used to protect and route electrical wiring in a building or non building structure. Electrical conduit may be made of metal, plastic, fiber, or fired clay. Most conduit is rigid, but flexible conduit is used for some purposes. What are the advantages of conduit wiring and what are its disadvantages? The main advantage of running wires in a conduit is that running large amounts of wire can be more efficient, not to mention after a certain size it’s the only option. Don’t forget there’s greater protection and also greater ability to expand your electrical system in the future when using conduit. The disadvantages would be expertise in running the conduit, the time factor in running a conduit over a multi-conductor cable, and there are some limitations on the ampacity of the wire that runs through the conduit. Because of the heat factor and how wires lay in a conduit t...

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