630kVA Three Phase Oil Immersed Distribution Transformer with Onan

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Model NO.: S11-630
Usage: Power Transformer, Distribution Transformer
Frequency Characteristics: Power Frequency
Shape of Core: Ring
Brand: Sce
Executed Standards: Iec60076
Rate L. V: 0.4kv or Customized
Capacity: 10~4000kVA or Customized
Rate H. V: 10kv or Customized
Impedance: 6.5~4% or Customized
Type: Transformer
Trademark: SCE
Transport Package: Wooden Crate
Origin: China
HS Code: 85042100
SCE offers three phases, oil immersed, and naturally cooled (ONAN) distribution transformers. SCE manufacture these transformers under a licensing agreement with IEC 60076. The standard manufacturing range is from 10 kVA to 20000 kVA with a maximum voltage of 35kV.

Core
The core is manufactured from cold-rolled grain oriented (CRGO) silicon steel. The silicon steel is either conventional or laser treated and the choice depends on the desired loss level. The steel sheets are cut into required dimensions on automated machines thereby ensuring reduced air gap, low exciting current and low noise. Each lamination is insulated from each other to ensure a long trouble-free lifetime of the core. Suitably designed core clamping system ensures vibration free operation.

630kVA Three Phase Oil Immersed Distribution Transformer with Onan


Windings
The windings are made of high-grade electrolytic cooper and are concentrically positioned. Usually copper foil is used for the low voltage windings. Round shaped, enamel insulated wire is used for the high voltage windings. It is exclusively of layered construction and is wound directly onto the low voltage winding, giving a maximum mechanical strength, rigidity and compactness.

630kVA Three Phase Oil Immersed Distribution Transformer with Onan


Tap changer
The tap changer is fixed on the high voltage winding for voltage regulation.
Off-load tap changer.
It is basically a 3, 5 positions switch, which helps to adjust the voltage at a desired level. The tap changer handle is either on the top cover or sidewall and acts directly on the switching mechanism. As the name indicates, the off-load tap changer must only be operated when the transformer is de-energized.
On-load tap changer.
For higher ratings power transformer, it is basically 7, 9, 11, 17 positions switch which can be operated with energized. Brand of MR, ABB or Huaming are our options for on-load tap changer.

Tank
The tank is of hermetically sealed design and is made from corrugated steel sheets. This type of construction allows a degree of flexibility that is needed to accommodate the expansion and contraction of oil due to varying service conditions. The tank cover is bolted to the body of the tank. The surface is shot blasted first to eliminate all signs of rust, welding spatters, greese, oil and mill scale to achieve a good abrasive surface for the paint to hold for a long period of time. The two coats of primer paint are applied followed by one coat of standard "Cement Gray" (RAL 7033). (Colour Code can be customized)

Bushings
Several types can be provided depending on the requirement and applications. Porcelain bushings are used on the HV side as a norm while on the LV side porcelain or polyamide bushings are provided. 
Other designs are also available on request.

Regular Accessories
The regular accessories would include:
Oil conservator(available on request, usually used for ratings above 2000kVA)
Temperature indicator
Pressure release valve
Oil level indicator
Oil drain valve
Oil sample valve
Earthing device
Lifting lug
Cable box (available on request)

Tests
All the manufactured units undergo the following tests in the factory as described in IEC-60076.
Transformer ratio and connection
  • Measurement of load losses and short circuit impedance.
  • Measurement of no-load losses.
  • Separate source withstand voltage test
  • Induced over-voltage test
  • On-load tap changer test (only for on-load power transformer)
  • Transformer oil test
  • Sealing test of tank
  • Temperature rise test
  • Lighting impulse withstand voltage test
  • Measurement of partial discharg
630kVA Three Phase Oil Immersed Distribution Transformer with Onan

 
S11 Series Main Performance Parameters of Transformers
Rated capacity
(KVA)		 Voltage combination(KV) Vector group No-load losses(W) Load losses(W) Short-circuit impedance
(%)		 No- load current (%)     Track gauge (mm)
Weight Dimension
(kg) (mm)
HV Tapping range LV    
Oil Total L W H
30         100 630/600 4 1.1 60 275 745 490 840 400×400
50         130 910/870 1 95 405 845 555 930
80         180 1310/1250 1 100 495 1005 635 1115
100         200 1580/1500 0.9 115 575 1020 725 1225
125         240 1890/1800 0.9 130 630 1175 770 1190 550×550
160         280 2310/2200 0.9 145 710 1210 840 1215
200 11       340 2730/2600 0.8 130 760 1270 890 975
250 10.5 ±5   Dyn11 400 3200/3050 0.7 155 880 1365 945 1030
315 10 or 0.4 or 480 3830/3650 0.7 170 1030 1380 955 1085
400 6.3 ±2×2.5   Yyn0 570 4520/4300 0.6 160 1195 1490 1055 1120
500 6       680 5410/5150 0.6 210 1380 1590 1110 1170 660×660
630         810 6200 4.5 0.5 265 1740 1650 1135 1235 820×820
800         980 7500 0.4 340 2065 1600 1100 1295
1000         1150 10300 0.4 375 2370 1700 1180 1355
1250         1360 12000 0.3 490 2850 1750 1225 1445
1600         1640 14500 0.25 610 3650 1840 1260 1575
2000         1940 18300 6 0.25 730 4200 1920 1400 1900
2500         2290 21200 0.2 810 4950 2100 1560 2050
3150         2750 25400 0.2 910 5650 2320 1800 2230 1070×1070
630kVA Three Phase Oil Immersed Distribution Transformer with Onan
 

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