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33KV DISTRIBUTION TRANSFORMER Technical Data Schedule FOR 25KVA |
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Description |
Unit |
TANESCO |
Bid |
|
It complies with International standard |
|
IEC 76 |
IEC 76 |
|
Manufacturer |
|
|
Guangdong Guangte Electric Co.,Ltd |
|
Country of origin |
|
|
China |
|
Nominal frequency |
Hz |
50 |
50 |
|
Nominal power rating |
kVA |
25 |
25 |
|
Maximum continuous power rating |
kVA |
25 |
25 |
|
Nominal primary voltage |
kV |
33/11 |
33/11 |
|
Nominal secondary voltage |
kV |
0.4 |
0.4 |
|
Type of Cooling |
|
ONAN |
ONAN |
|
Winding Polarity/Vector Group |
|
Dyn11 |
Dyn11 |
|
Number of Tap Positions |
|
5 |
5 |
|
Percentage Regulation per Tap |
% |
2.5 |
2.5 |
|
Basic Impulse Level 33/11 kV |
kV |
170/75 |
170/75 |
|
Impedance |
% |
4 |
4 |
|
Short Circuit Current |
kA |
25 at full load |
25 at full load |
|
Short Circuit Duration |
Sec |
2 |
2 |
|
X/R Ratio |
|
Specify |
IEC76-5 |
|
Duration of Overload: 25 % |
Min. |
60 |
60 |
|
50% |
Min. |
1 |
1 |
|
Design continuous ambient temperature |
°C |
40 |
40 |
|
Average winding temperature rise |
°C |
55 |
55 |
|
Top oil temperature rise |
°C |
50 |
50 |
|
Maximum hot spot temperature |
°C |
98 |
98 |
|
Temperature Gradient |
°C |
/ |
/ |
|
Flux Density |
T |
1.65 |
1.65 |
|
RIV level at 1Mhz |
µV |
|
250000 |
|
Core losses |
kW |
|
0.17/0.13 |
|
Winding losses |
kW |
|
1/0.6 |
|
No load current (at full voltage) |
A |
|
2.1 |
|
Regulation at full load: PF=1 |
% |
|
98.78/98.98 |
|
PF=0.85 |
% |
|
99.21/99.35 |
|
Silicone Steel: Manufacturer/country of origin/Type/Grade |
% |
|
Wuhan Steel Group/China/30Q120 |
|
Conductor for HV Windings: Manufacturer/country of origin/Type/Grade |
|
|
Luoyang Copper Co., Ltd /China/T2 |
|
Conductor of LV Windings: Manufacturer/country of origin/Type/Grade |
|
|
Luoyang Copper Co., Ltd /China/T2 |
|
Conductor Material: |
|
|
|
|
HV Windings |
|
|
Cooper |
|
LV Winding |
|
|
Cooper |
|
Conductor Shape: |
|
|
|
|
HV Windings |
|
|
Round |
|
LV Winding |
|
|
Round |
|
Maximum current density: |
|
|
|
|
Copper |
A/sq.mm |
|
3.8 |
|
Aluminium |
A/sq.mm |
|
2.2 |
|
HV Bushings: Manufacturer/country of origin/Type/Grade |
|
|
Yachen/China/BLQ-35/315/ Yachen/China/BLQ-12/315 |
|
LV Bushings: Manufacturer/country of origin/Type/Grade |
|
|
Yachen/China/BF-1/315 |
|
Bushing Catalogue Number: |
|
|
|
|
HV |
|
|
50261/50250 |
|
LV |
|
|
50200 |
|
Bushing Basic Impulse Level: |
|
|
|
|
HV |
kV |
|
170/50 |
|
LV |
kV |
|
/ |
|
Bushing Power Frequency Withstand: |
|
|
|
|
HV |
kV |
|
70/28 |
|
LV |
kV |
|
3 |
|
Puncture Voltage of HV Bushings |
kV |
|
|
|
Creepage Distance: |
|
|
|
|
HV Bushings 33/11kV |
mm |
|
1080/360 |
|
LV Bushings |
mm |
|
/ |
|
Are arcing horns fitted? (y/n) |
|
|
Yes |
|
Are arcing horns adjustable? (y/n) |
|
|
Yes |
|
Spark gap 33/11 |
mm |
|
100-250/25-80 |
|
Impulse flashover level with arcing horns fitted |
kV |
|
170/70 |
|
Slope of upper surface of bushing shed |
|
|
/ |
|
Can bushings be de-tanked without detaching cover? (y/n) |
|
|
N |
|
Colour of bushing porcelain |
|
|
Brown |
|
Type of HV Terminal |
|
|
Stud |
|
Metal used for terminal |
|
|
Cooper |
|
Stud Diameter |
mm |
|
12 |
|
Are conic spring washers fitted? (y/n) |
|
|
Y |
|
Range of permissible conductor sizes |
sq.mm |
|
3.8 |
|
Minimum phase to phase clearance |
mm |
|
380/240 |
|
Minimum phase to earth clearance |
mm |
|
/ |
|
Bushing to arrester clearance |
mm |
|
120 |
|
Type of HV Terminal |
|
|
Stud |
|
Type of LV Terminal |
|
|
Stud |
|
Metal used for terminal |
|
|
Cooper |
|
Stud Diameter |
mm |
|
12 |
|
Range of permissible conductor sizes |
sq. mm |
|
/ |
|
Type of atmospheric protection |
|
|
Tinned |
|
Minimum phase to phase clearance |
mm |
|
380240 |
|
Minimum phase to earth clearance |
mm |
|
/ |
|
Continuous current rating |
A |
|
300 |
|
Type of earth terminal |
|
|
Stud |
|
Spring and lock washers included? (y/n) |
|
|
Yes |
|
Tap Changer: Manufacturer/Country of origin/ Type/Grade |
|
|
Zhejiang, China, T 50/35 |
|
Can tap changer switch be locked? (y/n) |
|
|
Yes |
|
Circuit breaker : Manufacturer/country of origin |
|
|
/ |
|
Catalogue number |
|
|
/ |
|
International standard it complies with |
|
|
/ |
|
Rated Voltage 33/11 |
kV |
|
/ |
|
Rated Current |
A |
|
/ |
|
Symmetrical Breaking Capacity |
kA rms |
|
/ |
|
Rated Marking Current |
kA prak |
|
/ |
|
Degree of Washer Protection |
|
|
/ |
|
Dimensions: Length |
mm |
|
/ |
|
Width |
mm |
|
/ |
|
Height |
mm |
|
/ |
|
Weight in service |
kg |
|
/ |
|
Transformer Oil: Manufacturer/ Country of origin/ Type/Grade |
|
|
Sinopec/China/25# |
|
Quantity of Oil |
L |
|
80/60 |
|
Tank Construction |
|
Hermetically Sealed |
Hermetically Sealed |
|
Type of Steel |
|
Mild Steel |
Mild Steel |
|
Grade of Steel |
|
Mild Steel |
Mild Steel |
|
Shape of Tank |
|
|
Rectangular |
|
Minimum thickness of: Tank Steel: |
mm |
3 |
4 |
|
Top Cover: |
mm |
|
6 |
|
Cooling Surfaces: |
mm |
|
1.2 |
|
Grade of stainless steel weldwire (if applicable) |
|
|
/ |
|
Is tank fully filled with oil? (y/n) |
|
|
Y |
|
Top oil temperature for 100kN/sq.mm |
°C |
|
60 |
|
Steady load to give top oil temperature (30°C ambient) |
kW |
|
1.17/0.73 |
|
Steady load to give top oil temperature (30°C ambient and solar radiation of 120w/sq.m) |
kW |
|
/ |
|
Type of cooling surfaces |
|
|
Corrugated |
|
Type of metal on earth terminal |
|
|
Cooper |
|
Is pressure relief device offered? (y/n) |
|
|
Y |
|
Relief pressure for relief device |
kPA/sq.mm |
|
25 |
|
If no pressure relief device offered how will tank behave under overpressure? |
|
|
/ |
|
Are transformers tested for leakage? (y/n) |
|
|
Y |
|
Corrosion protection |
|
|
Yes |
|
Galvanizing: Type/Grade |
|
Hot dip Galvanised |
Hot dip Galvanised |
|
Galvanizer |
|
|
/ |
|
Core Type |
|
|
Wounded core type |
|
Tank Dimensions: |
|
|
|
|
Width |
mm |
|
700/500 |
|
Depth |
mm |
|
1000/880 |
|
Height |
mm |
|
1450/1000 |
|
Diameter |
mm |
|
/ |
|
Can transformers be handled by forklift? (y/n) |
|
Yes |
Yes |
|
Weight of tank |
kg |
|
80/60 |
|
Weight of core and windings |
kg |
|
200/130 |
|
Weight of oil at 20°C |
kg |
|
180/100 |
|
Total weight of transformer ready for service |
kg |
|
550/300 |
|
Shipping weight of transformer |
kg |
|
580/330 |
|
Guarantee period |
Months |
|
12 |
The relevant information：