This document provides technical specifications for a three-phase power transformer. Key details include: - Rated power of 100/60/60 MVA at ONAN and ONAF cooling - Three winding phases, 50 Hz frequency - Oil-immersed core type transformer meeting IEC 60076 standards - Primary voltage of 245 kV and secondary voltages of 10.5/10.5 kV - ON-load tap changer with ±8% range in 1.25% steps - Short circuit withstand levels of 12 GVA and 4 GVA for the high and low voltage terminals - ONAN/ONAF cooling using 14 radiators and 6 fans providing 304.2 m3/

1. Item Descriptions Unit Data
1 Rated power MVA 100/60/60
At ONAN cooling MVA 70/42/42
At ONAF cooling MVA 100/60/60
2 Number of phases 3
3 Rated frequency Hz 50
4 Number of windings 3
5 Applicable standards IEC 60076
6 Single or 3 phase units Three phase
7 Type of transformer Oil-immersed
8 Type of core
core or
shell
core
9 System maximum voltage for both winding
HV kV 245
LV kV 10.5/10.5
10 Insulation type
Primary Graded
Secondary Uniform
11 Power frequency withstand voltage, primary:
Line kV 460
Neutral kV 200
12 Lighting impulse level, primary:
Line kVp 1050
Neutral kVp 400
13
Power frequency withstand voltage,
secondary:
kV 50
14 Lighting impulse level, secondary: kVp 125
15 Rated Voltage - No load
Primary kV 230
Secondary kV 10.5
16 Tap changer On-Load (MR)
17 Tapping range ±8×1.25%
18 Permissible loading of neutral 100%
19 Phase connections:
Primary winding Star
Secondary winding Star
Vector Group Yny0yn0+d11
20
Short circuit withstand fault level at terminals
of:
245kV busbars GVA 12
Low-voltage busbars GVA 4
21 Type of cooling ONAN/ONAF
22 External cooling medium Air
TECHNICAL DATA SHEET
STATION TRANSFORMER 230/10,5-10,5KV-100/60/60MVA
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2. Item Descriptions Unit Data
23 Service conditions
Altitude not exceeding m 1000
Air temperature not exceeding o
C 40
24 Air temperature
Maximum in any one day o
C 38
Monthly average, of the hottest month o
C 36
Yearly average o
C 27
25
Winding temperature rise at CMR to IEC
60076
o
C IEC60076
26
Top oil temperature rise (average daily
ambient air temperature 32 C
CRM to IEC 60076 o
C IEC60076
ONAN rating o
C IEC60076
27
Maximum hot spot temperature when loaded
according to IEC 60354
o
C 118
28 Hot spot factor < 1.2
29
Flux density in iron at normal voltage and
frequency and at normal ratio (no load)
Core Tesla 1.7 max
Yokes Tesla 1.7 max
30
Transformer suitable for full load rejection
according to IEC 60076
yes/no Yes
31
Magnetizing current (approx) at nominal ratio
and
- at 0.9 x nominal voltage A 0.3
- at 1.0 x nominal voltage A 0.5
- at 1.1 x nominal voltage A 2.6
- at 1.2 x nominal voltage A 6
32 Guaranteed Losses at nominal ratio
No load losses kW 50
Copper losses at CRM kW 330
Auxiliary losses at CRM (for fans) kW 8
33 Regulation at 75 C and nominal ratio
At unity power factor % 0.34
At 0.9 lagging power factor % 4.5
34
Impedance voltage at 75 C and CRM
between HV and LV Windings at tap:
Maximum tap
Primary/Secondary (HV/LV1)
% ≥ 18
Nominal tap
Primary/Secondary (HV/LV2)
% ≥ 18
Minimum tap
Primary/Secondary (LV1/LV2)
% ≥ 36
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3. Item Descriptions Unit Data
35
The short circuit level withstand of 10.5kV
winding
kA/2s 90
36 Resistance voltage %max 0.5
37 Equivalent circuit zero sequence impedance ohms 57
38 Maximum current density in windings at
HV winding A/mm2 2.51
LV winding A/mm2 3.2
(b) General
1 Type of oil preservation system Conserator
2
Whether wheels, skid or flat bottom base
required
Flat Bottom Base
3 Whether anti-vibration pads required No
4 Transformer noise acceptance level dB (A) 70
(c) Details of construction
1 Type of tank Upper Flange Type
2 Tank fully vacuum proof yes Yes
3 Overall dimensions including bushings
Height mm 7500
Depth mm 6600
Width mm 8500
4 Shipping Dimensions
Height mm 3470
Depth mm 2600
Width mm 7500
5 Types of winding
HV Interleaved
LV Helical
6 Material of Insulation
HV windings Pressboard
LV windings Pressboard
7 Insulation of tapping connections Pressboard
8 Insulation of:
Yoke bolts Pressboard
Side plates Pressboard
9
Winding connections blazed or crimped -
Specify material (Winding material and the
joint material)
Crimped
10
Is facility provided for adjustment of axial
pressure on windings
yes/no yes
11 Thickness of transformer tank
Sides mm 10
Bottom mm 16
12 Material used for gaskets for oil tight joints Nitrile Rubber
13 Cover flange:
Level: Low/High High
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4. Item Descriptions Unit Data
Joint: WELDED/GASKET Gasketed
(d) Radiators valves and fans
1 Number of radiators per transformer nos 14
2
Maximum rating of each radiator as
percentage of total loss at CRM
% 7.1
3
Thickness of radiator plates and/or cooling
tubes
mm 1
4 Valve type/material:
75mm and below Brass valve
Above 75 mm Brass valve
5 Equipment for ONAN cooling state a) or b)
a) Radiator on main tank a
b) Separate cooler bank
6 Number of cooling air blowers per 6
7 Speed of air blowers and air flow
rpm
m3/min
590
304.2
8 Rating of each air blower motor kW 1.1
(e) Oil volumes and weights
1 Total oil required including cooler system L 56,000
2
Volume of oil to fill transformer to above the
top yoke
L 46,000
3 Total volume of conservator L 5,500
4
Volume of oil in conservator between highest
and lowest visible
L 2,289
5 Weight of core and winding Assembly kg 73,300
6
Weight of each oil cooler bank complete with
oil if mounted separately from transformer
kg 580
7
Total weights of complete transformer,
including attached cooler, voltage regulating
equipment, all fittings and oil
kg 162,000
8
Weight of transformer arranged for transport
(without oil)
kg 100,000
(f) Transformer oil
1 Manufacture, type and class of oil
IEC
60296
Class II
Karamay 25#
Caltex or Shell/Viet Nam
(g)
Transformer parts subject to short-circuit
test
1
Brief description of transformer or parts
thereof subjected to short-circuit test for
which short-circuit calculations are available
yes/no No
(h) Transformer bushings 10.5kV
1 Manufacturer's
Nanjing Zhida
Electric Co., Ltd
2 Rated normal voltage kV 24
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5. Item Descriptions Unit Data
3 Minimum impulse withstand voltage kVp 125
4
Dry power frequency flashover voltage of
bushings with all fittings
kV 58
5 Insulating materials Porcelain
6 Type of connection
Non-Segregated Phase
Busduct
7
Total creepage distance based on highest
system voltage
mm/kV 31
(k) Transformer bushing 220kV
1 Manufacturer's Trench China
2 Rated normal voltage kV 252
3 Minimum impulse withstand voltage kVP 1050
4
Dry power frequency flashover voltage of
bushings with all fittings
kV 460
5
Wet power frequency flashover voltage of
bushings with all fittings
kV 460
6 Insulating materials Oil-paper ínsulation
7 Length overall mm 4050
8 Weight of bushing complete with fittings kg 463
9 Electrostatic capacity of complate bushing pf 320
10 Materials of fittings Al Al
11
Total creepage distance based on nominal
system voltage
mm/kV 31
(i) Test
a
Routine tests according to IEC 60076 as
follows for each unit
1 Separate source over voltage withstand test
Primary kV 460
Secondary kV 50
2 Induced over voltage withstand test
Primary kV 460
Secondary kV 50
Test frequency Hz 200
Test duration min. 30 30s
3 Patial discharge measurement:
Test voltage between line and neutral (at
central position)
U1= 3×Um/ 3=Um kV 247
U2= 1.5×Um/ 3 kV 212
Permissible partial discharges at U2 pC 300
test frequency Hz 200
b
Type test according to IEC 60076 as follows
(one unit)
1 Lighting impulse tests
Full wave
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6. Item Descriptions Unit Data
Primary (line/neutral) kVp 1050
Secondary (line/neutral) kVp 125
2 Temperature rise One unit
c
Special tests according to IEC 60076 as
follows (one Unit)
1 Test of noise level dB (A) 70
2 Chopped wave tests
Primary kV 1155
Secondary kV 75
3 Switching impulse tests kV 950
l Deviation from Tender Specification
(if necessary on extra sheet) N/A
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