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HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page
29
of
70
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:
Parameter
Description
Value
V
1L
Rated line to line voltage
220 kV
V
1Lmax
Maximum line to line voltage
230 kV
V
2L
Rated line to line secondary
voltage at V
1L
100 V
Accuracy
Max voltage ratio error at R
L
≤
3%
Burden
Max VA load
0.01 VA
R
L
Min resistive load
1 MOhm
Bandwith -3 dB
10Hz - 10kHz
Table 17 – Voltage divider technical characteristics
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
).
Figure 17 – Voltage divider assembly
Electrical box
PF adapter
BNC cable
Output connector
Содержание PHI 265.850.1500
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