On a medium voltage one-line diagram where is the correct placement for the breaker meter / relay / trip device is the c/t to be indicated on the load or line side of the device it seems to me it is located on the line side however I see many documents that locate this on the load side??
protective relaying placement??
- Thread starter Mike01
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zog
Senior Member
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- Charlotte, NC
thats a vauge question, what type of relay?
50/51 relay CT's are typically on the load side
50/51 relay CT's are typically on the load side
ron
Senior Member
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- New York, 40.7514,-73.9925
Take a look at this manual.
sometimes the CT's and Pt's need to be on the line side and sometimes on the load side.
http://www.geindustrial.com/products/manuals/750/750man-a7.pdf
sometimes the CT's and Pt's need to be on the line side and sometimes on the load side.
http://www.geindustrial.com/products/manuals/750/750man-a7.pdf
By "device", I assume you mean the breaker. I would consider the "line" side and the "load" side to be the same because the load is at the end of the line. One side of the breaker would be the bus side and the other side would be the line sideMike01 said:
Ideally, CTs for line relays should be on the bus side and CTs for bus relaying should be on the line side. This way, faults in the breaker are covered by both sets of relays. It doesn't matter for metering; both locations see the same current.
Often, however, in MV switchgear, there is no space for CTs on the bus side so all CTs are placed on the line side.
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