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7
User manual - Annex III
High Voltage Instrument Transformers | DDB/DFK/DDN/DFN
Capacitance of each capacitor unit
The capacitance of each capacitor unit can be measured directly
between the fl anges of the insulators, with the exception of the
bottom insulator.
Test procedure for intermediate capacitor units or higher:
› The power supply cable (HV) of the measuring equipment must
be connected to the higher fl ange or the primary terminal.
› The measuring cable must be connected to the lower fl ange of
the capacitor unit.
Test procedure for the lower capacitor unit:
› Disconnect the HF connection to ground.
› The (HV) power cable of the measuring equipment must be
connected to the primary terminal (A/H1) or the higher fl ange.
› The measurement cable must be connected to the high
frequency terminal (HF).
1
3
TERMINAL A/H1
10 kV
Cn / FP GST-GND
AF / HF
TERMINAL A/H1
10 kV
C1 / FP GST-GND
TANQUE
2 kV
AF / HF
TANQUE
C2 / FP GST-GND
›
Fig. 1a
›
Fig. 1b
›
Fig. 2
›
Fig. 4
›
Fig. 3
High Voltage Terminal
High Voltage Capacitance
Intermediate Capacitance
Electromagnetic unit
Carrier
accessories
(if included
with unit)
Grounding
Switch
(if included
with unit)
C1
1
C2
2
3