Load & no-load voltage adjustable power transformer
- Data Sheet
SZ 35kV Power Transformer is a updated products and has more improvements than type “7” and the type “9” power transformer. The product adopts new designs on technologies, workmanship, materials, components and structure, not only energy and materials saving but also operation is safe and reliable, it has been recommended to use in urban and rural power grid construction and renovation projects.
To ensure the margin under normal working voltage and no magnetic saturation happened when the high system voltage, the iron core chose the reasonable magnetic flux density when it was designed, and the material of the iron core is good quality cold-rolled grain oriented silicon steel sheet by three phase, three column and the core pillars are multi-stage ladder cylinders., and it is fully inclined seams cascade multistage laminates, and non –holes packing solution.
The clamping piece can choose the profile structure of plate or channel steel, to reduce the amount of the welding and increase the strength, and strain the body by the upper and lower tie bolt, which make the structure is simple and increase of anti-short circuit capacity of the winding. Also, it take reasonable measures of damping to control the irregular seams of the lamination which make the small magnetic resistance and leakage. The section of the yoke is D type and same with the core pole below 6300KVA, 8000KVA or above, which can reduce the weight and energy waste, the smallest class film is widened design which can increase the contact surface between yoke and clamping piece and improve the clamping of the yoke.
The internal of the winding adopts the oil guide structure/ axial direction oil duct, that is conducive to heat dissipation and greatly reduce the copper oil temperature, so that the oil of all regions of the internal can be cooling to reduce the hottest temperature spot of the winding. The tap scope of the no-load transformer is only ± 3×2.5%, so which don’t set up the voltage regulation union independently, the tap line is placed in the center of main coil, thus it simplifies the structure. The high-low voltage winding adopts the principal insulation structure while designing. To control the distribution of ampere turns and impact strictly, thereby the amount of the materials will be reduced. The low voltage winding is winded around the high-strength paper tube directly, the high-low voltage winding adopts the radial and axial direction devices while winding, to increase the pressing force and reduce the constriction in working. Also, to tighten the internal and external support bars to make a support, the stability of winding is improved, the instability and the deformation is prevented. The winding can be treated with dip coating and packed with division phase; In order to enhance its mechanical strength and improve the ability of bearing the short-circuit, to change the structure of the pressing plate and strengthen the ends.
To improve the lead wire clamping structure, the products is colligated by the wood and the colligation which makes the lead wire firm and fixed.
The body adopts the new insulation flame and has been calculated the composite field intensity and ensure adequate insulation strength, which has large filling coefficient. The time of exposed in the atmosphere of the dried body y is controlled strictly and to keep from moisture; The body and the tank adopt ‘Rigidly Positioned’ to improve the capacity of product against the impact during the transportation.
The tank is free suspended core structure design, and it can be installed directly at site, with compact layout, beautiful styling and novel structure, it also can be bell or fold corrugated structure (flat-top type), in order to process easily to simplify the structure. The body is made by wide steel plate which can reduce the weld joint and increase the mechanical strength. To make mechanical processing for all the sealing faces (edge of the box, flange), it adopts “O” type seal gasket which can prevent the leakage, and the tank and the radiator of the transformer can withstand 0.05Mpa pressure, without any leakage and injury.
Accessories of main body: the terminal box adopts the stainless steel box which has good leak tightness and easy to connect. The two thermometer seats (soldering on the cover) are placed on the two ends of the macro axis of the tank, and the gas relay, the thermometer, and pressure release valve wire cable support are fixed on the body and the line is connected into the terminal box. However, the lowest part of all the accessories can’t be installed below the horizontal line of the body.
The information need to be provided as below:
1. Model Type
2. Rated Capacity
3. Phase No.
5. Voltage Combination/ Tapping Range
6. Union Symbol
7. Short Circuit Impedance
8. Tank Structure/ Cooling Model
9. Other Special Requests/ Conditions of Use
Connection Groups Symbol
(W) No-load Loss
(Ｗ) Load Loss
% No-load Current
% Short Circuit Impedance
kV High Voltage
kV Low Voltage