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SUBJECT: Data Sheet for Step-Up Power Transformer
Transformer. |
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| S/No |
Parameter |
Specified |
Offered |
| 1 |
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General: |
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| 1.1 |
Designation. |
Step-Up Power Transformer. |
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| 1.2 |
Quantity. |
1No. |
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| 1.3 |
Standards. |
IEC 60076. |
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| 1.4 |
Power Output Rating. |
70MVA, 3 phase, 50Hz, rated for continuous operation at ambient conditions. |
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| 1.5 |
Rated Voltage Ratio at no load. [Prim/Sec.] |
11KV/33KV. |
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| 1.6 |
Rated frequency variation. |
Plus minus 5%. |
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| 1.7 |
Power factor. |
Nominal 0.8 lagging to 0.9 leading. |
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| 1.8 |
Installation. |
Installed Outdoor, in direct sunlight. |
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| 1.9 |
CTs. |
CTs on HV, MV side bushings on each phase and Neutral for Protection relays. |
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| 1.10 |
Vector Group. |
YNd11 |
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| 1.11 |
Rated Lightning impulse voltage of 33KV Winding (peak). |
170KV. |
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| 1.12 |
Rated Lightning impulse voltage of 11KV Winding (peak). |
60KV. |
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| 1.13 |
Rated Power frequency withstand voltage of 33KV Winding (rms). |
70KV. |
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| 1.14 |
Sound level. |
< 70 dBA, As per IEC 60551. |
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| 1.15 |
Short circuit withstand. |
31.5KA, 3 phase, 3 sec. |
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| 1.16 |
Impedance voltage. |
7.5% at 75deg C winding temperature, Voltage tap at mid position. |
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| 1.17 |
Windings. |
Two windings, High conductivity electrolytic copper. |
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| 1.18 |
Insulation class. |
Class A, as per IEC 60076-2. |
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| 1.19 |
Bushings. |
HV bushings of Oil filled condenser type. Neutral and phase bushings to be similar.Creepage distance to be increased by 60% as compared to application for light pollution. |
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| 1.20 |
Arcing horns. |
Adjustable type for primary and secondary. |
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| 1.21 |
Connections. |
Pressurised air Bus Duct on primary; cables on secondary; Separate connection boxes for both. |
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| 1.22 |
Magnetic Core. |
Rigid unit structure, cold rolled grain oriented, high permeability silicon steel of low hysteresis loss. Max flux density 1.6 Tesla at rated voltage. |
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| 1.23 |
Transformer tank. |
Heavy mild steel plates, welded type. |
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| 1.24 |
Neutral. |
Brought out and earthed thru low resistance, 31.5KA, 3sec.. |
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| 1.25 |
Iron losses. |
< 30KW. |
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| 1.26 |
Copper losses. |
< 180KW. |
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| 2 |
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Ambient Temperatures/ Conditions: |
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| 2.1 |
Mean Max. |
48deg C. |
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| 2.2 |
Extreme max. |
55deg C. |
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| 2.3 |
Extreme Min. |
3deg C. |
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| 2.4 |
Average Mean/Max RH. |
80/96%. |
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| 2.5 |
Altitude. |
<1000Meters. |
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| 3 |
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Cooling/ Ratings: |
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| 3.1 |
Type. |
ONAN/ ONAF; by pure refined mineral Oil as per IEC 60296. |
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| 3.2 |
Radiators. |
Detachable type, with Isolating Valves for each group. |
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| 3.3 |
ONAN Power rating. |
56MVA. |
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| 3.4 |
ONAF Power rating. |
70MVA. |
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| 3.5 |
Cooling fan control. |
With CB, Contactor, motor overload, Auto thru winding temperature/ manual control, modulated control thru temperature, local LED indications with lamp test, status and alarms for remote. |
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| 4 |
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Temperature Rises: |
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| 4.1 |
Top Oil. |
43deg C. |
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| 4.2 |
Windings. |
50deg C. |
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| Max Oil temperature. |
98deg C. |
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| 4.3 |
Winding Hottest spot temperature. |
105deg C. |
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| 5 |
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Tap Changer: |
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| 5.1 |
Type. |
On-Load tap changer, in a separate compartment with independent oil system; as per IEC 60214, 60542. To have automatic voltage regulator. |
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| 5.2 |
Voltage adjustment on HV side. |
Plus 12.5% thru 10 steps; Minus 12.5% thru 10 steps. [Total minimum 21 steps.] |
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| 5.3 |
Motor drive. |
With Auto/ Manual and Local/Remote operation, torque limit switches, local and remote LED indications with lamp test for status and tap positions, terminals. Provision for manual mechanical operation thru crank, status indication at DCS. |
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| 5.4 |
AVR |
Automatic voltage regulator to be provided for auto operation of the OLTC. This should have manual operation provision as well and be as per IEC. |
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| 5.5 |
Remote Control Panel |
Remote control panel with complete operation, protections, LED indications and metering. |
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| 6 |
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Auxiliaries: |
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| 6.1 |
Oil conservator with air breather. |
One for each of main and Tap changer compartments, rated for oil expansion upto 110deg C oil temperature. |
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| 6.2 |
Magnetic Oil level indicator with max and min oil level contacts, filler, drain Valve. |
For each compartment. |
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| 6.3 |
Two parallel breathers with silica gel, isolating valves. |
For each compartment. |
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| 6.4 |
Pressure relief valve with contact device. |
For each compartment. |
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| 6.5 |
Buchholz relay. |
With 2 stages, alarm and trip contacts. |
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| 6.6 |
Oil temperature indicator. |
With max achieved pointer and 2 stage contacts. |
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| 6.7 |
Winding temperature indicator. |
With max achieved pointer and 2 stage contacts. |
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| 6.8 |
Bi directional wheels. |
4No. |
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| 6.9 |
Lifting devices. |
4No jacking lugs. Lifting facilities for core/ coils/ tank/ cover. |
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| 6.10 |
Ladder. |
For access to highest point. |
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| 6.11 |
Marshalling box. |
To IP65, with utility sockets, lights, 250A 400V TP socket for Oil Purification unit, anti condensation heater, test facilities, with terminals, terminal Nos on both sides, wire Nos. |
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| 6.12 |
Earthing. |
Two No diagonally opposite points. |
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| 6.13 |
Rating plate. |
Rating plate as per IEC 60076, stainless steel, with all ratings, voltage and tap ratings, ambient temperature, windings diagram, showing physical location of terminals. |
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| 6.14 |
Aux plates. |
Plates for all Valves, Brief operating and maintenance instructions, plate on inside the marshalling box showing terminal details. |
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| 6.15 |
Protection. |
As far as applicable, parts to be hot dip galvanized. Other parts to have 4 coat painting - rust primer, filler, 1st coat, 2nd coat to RAL 9006 [white aluminum], rated for max metal temperature of 130deg C. |
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| 6.16 |
Transformer auxiliary power requirement. |
400V/230V, 50Hz. Please mention KW requirement. |
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| 7 |
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Physical Parameters: |
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| 7.1 |
Dimensions LxWxH [Cms]. |
Please mention in 'Offered' column. |
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| 7.2 |
Dry Weight [Kg]. |
= |
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| 7.3 |
Total weight with Oil [Kg]. |
= |
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| 8 |
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Scope: |
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| 8.1 |
Scope. |
Supply, Assembly at site, Testing, Commissioning, Warrantees, Guarantees. |
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| 8.2 |
Inspections. |
Factory inspections, Type test on one Transformer, and other tests. |
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| 8.3 |
Spare parts. |
Commissioning spares and Spare parts for two years of operation. |
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| 8.4 |
Tools. |
Special tools for maintenance and operation. |
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| 8.5 |
Documentation required with quotation. |
This Data sheet with completed column for 'Offered' parameters; Catalogues; Spec sheets; Itemized prices. |
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| 8.6 |
Project Documentation. |
As Built documents, hard and soft copies; catalogues; reports of inspections, tests, settings, commissioning. |
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China National
Electric Wire&Cable Imp./Exp. Corp
