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400 kV Inductive Voltage Transformer
Schedule A — Eskom’s requirements.
Schedule B — To be completed by the tenderer.
Item
A
400 kV Inductive Voltage Transformer
(VT)
1
Manufacturer
SCHEDULE B
Technical
guarantees for
equipment offered
_________________
2
Manufacturer's type number
_________________
3
System conditions for which the VT shall
be suitable
a) Rated frequency
b) System neutral
c) Rated r.m.s. line-to-line voltage
d) Maximum continuous r.m.s. line-toline voltage
4
6
7
8
Hz
kV
50
Effectively
earthed
400
kV
420
kV
1425
_________________
_________________
Insulation
a) Minimum crest value of full wave
lightning impulse type test withstand
voltage to earth at sea level on HV
terminal
b) Characteristic of impulse wave
c) Minimum crest value of full wave
switching impulse type test withstand
voltage to earth at sea level on HV
terminal
d) Characteristic of impulse wave
e) Minimum 60 s power frequency wet
withstand type test voltage to earth at
sea level on HV terminal
f) Minimum 60 s power frequency dry
withstand routine test voltage at sea level
on HV terminal
g) Partial discharge type test in
accordance with 12 of IEC 60358
5
SCHEDULE A
Eskom
requirements
1-5/40-50 s
kV
1050
250/2 500 s
_________________
kV r.m.s.
630
_________________
kV r.m.s.
630
_________________
Complies
_________________
266
2500
_________________
_________________
10
_________________
1
1
1
3
_________________
_________________
_________________
_________________
Radio influence
a) Test voltage
b) Maximum radio influence voltage
kV
V
LV terminals
Minimum 60 s power frequency dry
withstand routine test voltage on low
voltage terminal
kV r.m.s.
VT Secondary windings
a) Protection (P1)
b) Protection (P2)
c) Metering (M)
d) Total
Rated VT transformation ratios
a) Protection winding (P1)
b) Protection winding (P2)
c) Metering winding
_________________
400/3 kV to
110/3 V
400/3 kV to
110/3 V
400/3 kV to
110/3 V
_________________
_________________
_________________
1
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Item
A
400 kV Inductive Voltage
Transformer (VT)
9
Rated burden of secondary windings
a) P1 winding
b) P2 winding
c) M winding
d) Total burden
11
12
13
14
Secondary short circuit current
a) P1 winding
b) P2 winding
c) M winding
Recommended maximum rating of
fuses protecting the voltage
transformer secondary windings
Minimum 60 s power frequency
withstand routine test voltage on
secondary windings
SCHEDULE A
Eskom
requirements
VA
VA
VA
VA
Mass of complete VT
16
Type test reports
a) Reports available?
b) If type test reports are not available,
how soon can reports be made
available?
_________________
_________________
_________________
_________________
A
__________________
__________________
__________________
A
kV r.m.s.
Secondary terminals
a) Separate terminal box for
secondary terminals with gland plate
facilities.
15
50
50
50
150
SCHEDULE B
Technical
guarantees for
equipment offered
kg
__________________
2
__________________
Yes
________________
xxxxxxxxx
__________________
xxxxxxxxxx
xxxxxxxxxx
_________________
__________________
______________
Andre Marais
Chief Engineer
PDE HV Plant
Date:_________
______________
Chris vd Merwe
Corporate Specialist
Engineering
Date:________