Whats meant by trivector meter where it is connected at the
substation?
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Answer Posted / nirupa chaturvedi
A Kelvin bridge (also called a Kelvin double bridge and in
some countries a Thomson bridge) is a measuring instrument
invented by William Thomson, 1st Baron Kelvin. It is used to
measure an unknown electrical resistance below 1 Ω. Its
operation is similar to the Wheatstone bridge except for the
presence of additional resistors. These additional low value
resistors and the internal configuration of the bridge are
arranged to substantially reduce measurement errors
introduced by voltage drops in the high current (low
resistance) arm of the bridge [1].It consist of two ratio
arms. The outer ratio arm contains the known resistors and
the inner ratio arm helps to connect the one terminal of the
galvanometer at the appropriate point (which was the
disadvantage of the Kelvin first bridge).
Principle of operation
The measurement is made by adjusting some resistors in the
bridge, and the balance is achieved when:
Resistance R should be as low as possible (much lower than
the measured value) and for that reason is usually made as a
short thick rod of solid copper. If the condition R3·R`4 =
R`3·R4 is met (and value of R is low), then the last
component in the equation can be neglected and it can be
assumed that:
Which is equivalent to the WheatstoN
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