March 25th, 2009
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This system is similar to voltage balance system except that here balance or opposition is between the voltages induced in the secondary windings wound on the relay magnet and not between the secondary voltages of the line current transformers. This permits to use current transformers of normal design and eliminates one of the most serious [...]
Written by John on March 25th, 2009 with 2 comments.
Read more articles on Feeder protection and Power System and Switchgear&Protection.
Figure shows the single line diagram of Merz Price voltage balance system for the protection of 3-phse line. Identical current transformers are placed in each phase at both ends of the line. The pair of CTs in each line is connected in series with a relay in such a way that under normal conditions, their [...]
Written by John on March 25th, 2009 with 2 comments.
Read more articles on Feeder protection and Power System and Switchgear&Protection.
The differential pilot-wire protection is based on the principle that under normal conditions, the current entering one end of a line is equal to that leaving the other end. As soon as a fault occurs between the two ends this condition no longer holds and the difference of incoming and outgoing currents is arranged to [...]
Written by John on March 25th, 2009 with 3 comments.
Read more articles on Feeder protection and Power System and Switchgear&Protection.
