Instrument transformers
Current transformers (CTs)
Figure 5: Type SDV6 distribution circuit
breaker with interphase barriers and
bushing current transformers installed in
primary compartment on page 17
illustrates bushing (toroidal) CTs installed
in the primary compartment of a type
SDV6 distribution circuit breaker. The roof
bushings pass through the CTs. Up to two
CTs may be mounted around each roof
bushing. The bushing CT connections are
wired to separate terminal blocks located
in the low-voltage operator compartment.
Phase barriers
Phase barriers are provided on all 27.6 kV
and 38.0 kV class type SDV6 distribution
circuit breakers as shown in Type SDV6
distribution circuit breaker with interphase
barriers and bushing current transformers
installed in primary compartment on page
17. These plates of insulating material are
attached to the circuit breaker housing and
provide suitable electrical insulation
between the vacuum interrupter primary
circuits.
Hazardous voltages.
Will cause death, serious injury or property damage.
Do not operate current transformers with the secondary open-
circuited. Current transformers must be either connected to a
load or short circuited. Current transformer secondary circuits
also must be grounded.
16
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