2Station service voltage transformer
Advantages
The TIP offers several advanteges: reduced dimensions more than
one secondary winding suitable for both metering and power
maintenance free higher availability of the power source as the TIP
is directly connected with the high voltage side
higher reliability due to reduced number of components for
energy conversion
no needs of medium voltage connections
lower costs and connection times for the client
less space required for installation high seismic withstand
capability wide range of power available suitable for applications
in mobile stations (Figure 1)
available with a gas insulated disconnector to increase the
flexibility in operation (Figure 2)
higher performance in very heavy polluted environment thanks to
composite insulator
higher safety thanks to the use of composite insulator and of
pressure relief device.
Technical features
The TIP is mounted onto a metallic support.
The gas insulated voltage transformer is suitable for outdoor
installations.
The magnetic cores are made of laminated steel with oriented
grain and a high level of permeability.
The windings are made of electrolytic copper.
The primary winding is connected directly to the high voltage
while the secondary winding supplies the low voltage panels.
The high voltage terminals are made of high conductivity
aluminium and can be either cylindrical or NEMA flat type.
The external bushing is made of composite material in accordance
with IEC 61642 Standards, suitable to be installed in highly
polluted areas (level 4).
Fig. 1 Fig. 2
The TIP Station service voltage transformer is a voltage
transformer insulated in SF6 gas that combines the characteristics
of a voltage transformer with power capability.
The TIP has been designed for voltage up to 420 kV and with
power capability up to 125 kVA.
The main feature of the TIP is that the power- low voltage side-
arises directly from the overhead lines.
In this way the TIP is suitable to supply auxiliary services,
lighting loads, motor loads, instrumentation, etc.
Typical secondary ratings available: 115, 230, 120/240, 277,
240/480, 600 VAC. Other ratings are available.
87
5 6
3
2
1
9B
A
4
10
3
4 3 2 1 PE
1a 1n 2a 2n
A N
Electrical diagram plate
Key
1. High voltage terminal
2. Composite insulator
3. Aluminium tank
4. Pressure relief device
5. Nameplate
6. Secondary terminal box
7. Cable glande for low voltage cables
8. Earth connection
9. Density monitor
10. Hoisting hooks
Overall dimensions
Nominal voltage
kV
Nominal power
kVA
A
mm
B
mm
Max weight
kg
72.5
25 2050 600 700
50 2250 600 1000
100 2570 600 1850
125 2595 600 2000
145
25 2485 600 720
50 2690 600 1050
100 3030 600 1900
125 3060 600 2050
170
25 2890 600 890
50 3230 600 1420
100 3230 600 2300
125 3230 600 2650
245
25 3810 600 1250
50 3810 600 1650
100 4120 800 2550
125 4120 800 2750
420
25 5670 800 1550
50 5860 900 2350
100 6050 1000 3750
125 6050 1000 3900
The base of the transformer is fitted with: a densimeter for gas
monitoring a filling valve DILO type DN8 (DN20 for 420 kV)
a pressure relief device hoisting hooks a secondary box with a
protection degree not less than IP44 according to the IEC 60529
Standards
a M12 bolt for grounding connection.
The rating plate of each voltage transformer includes all the
data required by the IEC 60044-2 Standards.
Tightness of the insulation system
The tightness of the insulation system has been designed to
guarantee a life cycle time of 30 years. Maximum admitted gas
leakage: less than 0.1% per year.
Technical details
TIP Power frequency
kV
BIL
kV
72.5 kV 140 325
145 kV 275 650
170 kV 325 750
245 kV 460 1050
420 kV 630 1425
LOCK OuT ALARM
SchematicS
DenSity monitor contactS
