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Indoor voltage sensors
Voltage measurement in the KEVA sensor is based on
the resistive divider principle.
KEVA 17.5 B20
KEVA B sensor can be used in all applications up to
the voltage level 17.5 kV.
The sensor fulfills requirements of accuracy class 0.5
for measurement purposes and accuracy class 3P for
protection purposes.
Technical parameters
Rated primary voltage 15/√3 kV
Rated power frequency withstand voltage 38 (42)
kV
Rated lightning impulse withstand voltage 95 kV
Transformation ratio 10 000:1
Accuracy class 0.5 / 3P
Figure 39: Voltage sensor KEVA 17.5 B20
4.4.5. Voltage presence indicating system (Figure
40).
Depending on the current transformer type, the
capacitive dividers for voltage signalling are
integrated either in the current transformers itself or in
the cable connections insulator.
They are connected to a device containing the
signalling lamps and the bushings for checking phase
concordance. The light of the voltage signalling lamps
can either be fixed or flashing. Voltage valves can be
supplied on request.
WARNING
Before handling the system connections, make
sure that the relevant line is disconnected and the
cables are earthed.
Figure 40: Voltage presence indicating system.
Figure 41: Electrical diagram.
1 Capacitive socket shunted either from the insulator
or from the current transformers.
2 Voltage presence indicating system.
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