Product Description

25000 kVA 115 kV38.5KVdouble winding power transformer

technical parameters:

Rated power, kVA-25000

voltage rating, kV VN - 115

rated voltage, kV NN - 6,6

Idle loss (Ro),W -6000.00g windings;

cooling: ONAN/ONAF;

rated voltage ratio: 115±9 × 1.78%/6.6

winding connection diagram and group-Un/D-0-11 (equal to YNd11);

short-circuit loss (Rc.h.),W-140 kW no-load current (1x. x.),% - 0.2%

short circuit voltage IR),% - 10.5 oil weight, kg - 11050 total weight, kg - 46800 rated

connection group: yn,d11
winding combination: h-l
No-load current (%):0.5
No-load loss (kW):26.2
Load loss (kW ):142
Lmpedance(%):10.5
Active part weight (kg): about 46.3 tons
Transport weight (kg): about 53.2 tons (nitrogen)
Transport size (L W H mm):6920x4320x5310
Capacity: 25000kva

structural features:
1, iron core
1.1 iron core adopts cold-rolled crystal silicon steel plate 30Z140, high quality, low loss, no
Time effect, cut by Geroge line, no burr. 1.2 iron core adopts pull plate structure, upper
The downward yoke is clamped by the plates, forming a frame structure. Iron core adopts advanced lamination
process, effectively control the no-load loss and electromagnetic noise.

2 Winding
The 2.1 winding adopts a mature structure to ensure the reliability of the transformer operation.
2.2 inter-turn insulation power field strength shall be controlled at no more than 1.6kV/mm.

3 the body.
The 3.1 main body adopts mature thermal insulation structure, and the axial thermal insulation allowance of the main body is strictly guaranteed.
Most of the 3.2 body adopts multi-coil overall assembly, constant pressure evaporation treatment, so that
The coil shrinks evenly and rebounds less, which enhances the electrical strength and mechanical strength.
The 3.3 is made of laminated wood or insulating cardboard. Press with a pin to ensure
The windings are constantly compacted.

4. Wire
4.1 the layout of all wires is reasonable to ensure sufficient electrical distance and mechanical
Strance.
4.2 all wires are rolled up, which guarantees a reliable wild or prize connection.

5. Oil tank
The 5.1 tank adopts a flat-top bell-type structure, which not only increases the mechanical strength of the tank, but also
Make the appearance beautiful and generous, more convenient on-site installation.
5.2 Pipes with gas relays, such as oil pipes and bushings on the top of the fuel tank. Hoist bracket with hoist
gradient to facilitate the flow of gas in the transformer to the gas relay.
The 5.3 is vacuum oiled and there is no leakage or permanent deformation in the following tests. Vacuum-
Pumping: 759mmHg load voltage test: withstand 2 times the oil pressure of the oil tank for 24 hours.
The structure of the 5.4 transformer facilitates the removal and replacement of bushings and porcelain parts.
The 5.5 drip valve is set at the bottom of the oil tank, and the sampling valve is set in the middle.
The 5.6 collective gas connecting pipe is fixed on the bushing hoist bracket.
The 5.7 transformer is of fully sealed structure, and the upper and lower oil tanks shall be fully welded.

6. Oil storage tank
The 6.1 uses a capsule-type, finger-type oil level indicator storage tank.
The 6.2 structure facilitates internal cleaning, so the capacity can ensure that no oil spills in a 40-year environment
Before -25 years of operation, the temperature and oil at full load should be seen from the oil level indicator.
The 6.3 oil storage tank is equipped with an oil-sealed hygroscopic agent.

7. Safety protection device:
7.1 The gas relay is fixed in the transformer, and the standard conforms to the ZBK41004-89Gas relay.
The 7.2 has a sufficiently reliable pressure release device, which is matched with the fuel injection pipe. The direction of the oil
The spray is downward.

8. Oil temperature measuring device:
A pipe bracket with a mercury thermometer is 8.1, which is set on the top of the fuel tank.
8.2 there is a temperature controller, the accuracy of the thermometer meets the relevant standards. Quantity
The technical requirements shall be in accordance with the bidding documents.

9. Each component of the transformer should be prefabricated and marked at the manufacturing plant to ensure
Smooth procedure for field assembly. Before leaving the factory, the inner core should be checked and the fifth
Transformers.

structure:

Packaging and Transportation