Power
Transformer

Our rules require the design engineer to systematically calculate the fault currents in all failure cases with the tap changer(s) in different positions:

• Three phase faults line to ground
• Single phase to ground faults
• Single phase line to line
• Two phase faults line to ground

   

The short circuit current is imported into our short circuit calculation software. Our FEM software uses parametric automatic modeling, where the winding is modeled according to the dimensions of each disc and the oil duct, and is able to accurately calculate the axial and radial forces in the winding, and then calculate the safety margins for each type of force (Mean hoop tensile stress on disc, helical and layer-type windings; Stress due to radial or axial bending of conductors between axial sticks and spacers; Maximum axial compression force on each physical winding, etc.).

Our materials are purchased in strict accordance with our own purchasing specifications, our manufacturing process is carried out in accordance with the factory's process specifications and with specialized manufacturing technicians.

The company adopts modern FEM tools to calculate in detail the loss of structural parts of the active part, including the loss of the upper clamp, the loss of the lower clamp, the loss of the flitch plate, the loss of the final stage core piece, the loss of the magnetic circuit of the core, the loss of the fuel tank and so on. Calculate the temperature rise through the magnetic-thermal coupling field to prevent hot spots in the transformer structure parts.

We calculate the maximum voltage of the transformer in each state (LI, LIC, SI, LTAC,AV, etc.) according to the appropriate standards to ensure that the transformer is able to withstand the harsh insulation conditions during operation in the field. Our computer program is capable of calculating transient voltage distributions, taking into account the role of winding capacitance and inductance. The general principle is

• Lumped parameter model
• Dividing all windings in a finite number of branches
• Calculation of capacitances and inductances
• Solving the problem
• Voltage distribution

In the design of transformer tanks, the structural strength of transformer tanks under vacuum conditions is simulated by FEM software, and the deformation and stress of the tanks are calculated by changing the number and spacing of reinforcing irons on the side walls, etc., so as to find out the weak points of the strength and optimize the design.

Our core process employees have over 10 years of professional industrial experience, and WSS Engineering Managing Syetem what we followed is implementing as the fundamental quality standard for QA, strictly adhere to DR/DCP procedures for quality control throughout the entire production processes. Each manufacturing process employs continuously improved SOPs (Standard Operating Procedures) and corresponding checklists to conduct pre- and post-process confirmation.