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High Voltage Instrument Transformers | CA/UT/KA
User Manual - Annex III
Primaries vs. Secondaries+ Ground N/S+G (Fig. 8)
› The line cable of the measuring equipment must be connected
to the terminals of the primary winding (A-N) that are short-
circuited with each other, and the grounding plate (N*) must
be disconnected from the primary winding.
› The ground cable of the measuring instrument must be
connected to the short-circuited secondary terminals together
with the ground terminals on the secondary terminal block as
well as the tank.
Secondaries vs Ground S/G (Fig. 9)
› Primary terminal A must be disconnected and the neutral
connection of the (N*) primary winding must be grounded.
› The line cable of the measuring equipment must be connected
to the short-circuited secondary terminals.
› The grounding cable of the measuring equipment must be
connected to the tank.
Between secondaries S/S
› This test is only applicable to transformers having more than
1 secondary.
› Primary terminal A must be disconnected and the neutral
connection of the (N*) primary winding must be grounded.
› The secondaries to be assessed will be connected; one to
the line cable and the other(s) to the ground cable of the
measuring equipment.
› The test is repeated with each secondary.
INDUCTIVE VOLTAGE TRANSFORMERS/
› Fig. 8 › Fig. 9
* The N or P2 terminal can be located inside the secondary terminal box on the side of the box or on the outside of the tank.
N
N
A A
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