500 kVA Dead Front Pad Mounted Transformer-24.94/0.48 kV | Canada 2024

Exquisite quality, intelligent distribution – Three-Phase Pad-Mounted Transformer, the new benchmark for energy management!

01 General

1.1 Project Description

500 kVA pad mounted transformer was delivered to Canada in 2022. The rated power of the transformer is 500 kVA with ONAN cooling. The primary voltage of the transformer is 24.94GrdY/14.4kV, while the secondary voltage is 0.48y/0.277kV with two voltages in the LV side, which is precisely the uniqueness of this transformer. they formed a vector group of YNyn0.

Pad mounted transformer, also known as combined substation, is a complete set of transformer and distribution device that combines combined transformer, high-voltage load switch and protective fuse device, low-voltage distribution wiring part, etc. It is used in ring network power supply, dual power supply or terminal power supply system. Applicable to factories, mines, oil fields, ports, airports, urban public buildings, residential areas, highways, underground facilities and other places. It has the advantages of easy conversion of power supply mode, safe and reliable operation, small size, fast installation, safe use, easy operation, beautiful appearance and easy maintenance. Economically, it has the advantages of small footprint, short construction period and less waste.

1.2 Technical Specification

500 kVA pad mounted transformer specification and data sheet

1.3 Drawings

150 kVA pad mounted transformer diagram drawing and size.

02 Manufacturing

2.1 Core

Iron core is the main component of power transformer, its structure has two basic forms of core and shell, we produce this kind of pad mounted transformer to adopt the core structure in the form of stacked iron core. Laminated iron core is made of laminated electrical silicon steel sheet one by one, and the core material is cold-rolled grain-oriented silicon steel sheet. The core is vertically placed, and is mainly composed of core lamination, clamp, foot, pull belt, pull plate and support plate. The part with winding outside the iron core is called the core column, the part without winding is called the iron yoke, the iron yoke is divided into the upper iron yoke and the lower iron yoke, for the three phase five column type iron core on both sides, the unsheathed winding is called the side yoke.

2.2 Winding

The winding wire of foil winding is not made of round copper wire and flat copper wire, but is wound with copper foil or aluminum foil, each layer is wound for one turn, and each layer of copper foil is separated by insulating material. This insulating material is made of Nomax insulating paper produced by DuPont Company in the United States. This insulating paper is resistant to high temperature, flame retardant and good insulation. The copper foil and the insulating paper are stacked together and wound, the width of the insulating paper is greater than the width of the copper foil, and the wide part of the two sides is covered with insulation strips of the same thickness as the copper foil and is involved at the same time to form end insulation, and the support strips are placed between each two or three layers for ventilation and heat dissipation. After the copper foil and the insulating paper are wound according to the prescribed number of layers, the insulating paper is wound several layers and then the non-alkali insulating tape is wound on the insulating paper. After the winding is soaked and dried, it can be set. Foil winding is generally suitable for low-voltage winding of transformer.

2.3 Tank

1. The top of the box can be naturally drained, and the tilt Angle of the top cover is not less than 3° 2. Good anti-sunscreen performance, not easy to heat conduction, to avoid excessive box temperature caused by excessive external temperature, insulation layer 3. Good moisture-proof performance, not easy to produce condensation 4. Anti-corrosion, flame retardant, anti-freeze 5. Good mechanical properties, pressure resistance, impact resistance 6. Coordination with the environment

2.4 Final Assembly

After the core and winding components are made, they should be assembled. After the core and winding components are made, they should be assembled. First, remove the upper clamp, remove the upper iron yoke, put the lower end insulation, put the core insulating cardboard set the low voltage winding and high voltage winding, put the upper end insulation, plug in the iron yoke, install the clamp, tighten the winding, install the lead, install the tap changer. The tap-changer is to change the turn ratio of the transformer by changing the tap position to ensure the stable voltage output. After the body is assembled, enter the vacuum drying room to dry, the tank can be installed after the body is dry, the tank of the transformer is to protect the shell of the transformer body and the container of oil, and is also the skeleton of the assembly of the external structural components of the transformer, and can play the role of convection and radiation between the transformer oil and the atmosphere, and transfer heat energy.

03 Testing

Insulation test: including dielectric strength test and insulation resistance test to ensure that the quality of winding and insulation materials meet the requirements.

Load loss and no-load loss test: Used to measure power loss at rated load and rated voltage to verify its performance.

Short-circuit impedance test: The short-circuit impedance of a transformer is measured to assess the transformer’s response to short-circuit currents.

Impulse voltage test: Used to test the ability of an insulating system to withstand sudden overvoltages.

Zero sequence component test: Check the transformer windings for shorting.

Tap-changer test: Used to test the action, stability and performance of the tap-changer.

Temperature rise test: Determine the temperature rise of the transformer under rated load and ensure that it does not exceed the allowable limit.

Appearance inspection: Check whether the appearance, signage and installation of the transformer meet the requirements.

04 Packing and Shipping

05 Site And Summary

Thank you for your interest in our three-phase pad-mounted transformer! As a core component in power transmission and distribution, our product stands out with its efficiency, stability, and safety, meeting diverse application needs. Whether for industrial parks or commercial facilities, it provides reliable power solutions you can depend on. Understanding the strict demands for quality and service in power systems, we are committed to offering innovative technology and attentive support. We look forward to providing professional power solutions for your projects and working together toward an efficient and sustainable future! Please feel free to contact us with any inquiries.