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To the PF tap it is possible to connect the voltage divider for the valve operation controlling system (see Chapter
12).
WARNING: PF tap MUST be accurately closed with its cap or connected to the voltage divider unit. Missing the
cap is dangerous and it will cause an electrical failure at bushing energizing.
12
Voltage divider unit
The unit is provided with a capacitive voltage divider for an indirect measurement of the AC component of the
transformer voltage through the PF tap.
The main characteristics are:
The unit is composed by two separate parts. The first is the adapter to the PF tap, that includes also 2 protection
surge arrestors, while the second is the electrical box, that includes all other electric components of the divider.
The two parts are connected by a special BNC cable (see Figure 17).
HVDC TRANSFORMER BUSHINGS
Parameter
V
Rated line to line voltage
1L
V
Maximum line to line voltage
1Lmax
Rated line to line secondary
V
2L
Accuracy
Max voltage ratio error at R
Burden
R
L
Table 17 – Voltage divider technical characteristics
Figure 17 – Voltage divider assembly
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
Description
voltage at V
1L
Max VA load
Min resistive load
Bandwith -3 dB
IS 2664 GB
Page 29 of 70
Value
220 kV
230 kV
100 V
≤ 3%
L
0.01 VA
1 MOhm
10Hz - 10kHz
PF adapter
BNC cable
Electrical box
Output connector
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