150 kVA Liquid Filled Transformer-13.2/0.48 kV | Canada 2024

Effortlessly handling complex power demands – Three-Phase Pad-Mounted Transformer ensures every kilowatt is reliable and efficient!

01 General

1.1 Project Description

SCOTECH recently exported a top-of-the-line 150kVA three phase pad mounted transformer to Canada. The primary voltage of the liquid filled transformer is 13.2Y/7.62kV, while the secondary voltage is 0.48Y/0.277kV with two voltages in the LV side, which is precisely the uniqueness of this transformer.

The pad mounted transformer is a complete set of electrical equipment that combines the transformer, the load switch and the protective fuse device of the high voltage current part, the load switch and the protective fuse device of the low voltage current part, and the measurement and switch of the low voltage distribution part. The transformer body, high-voltage load switch, fuse and other components are placed together in the transformer tank, because of immersion in oil, the component volume is greatly reduced, the structure is more compact, easy to install and flexible. Fully insulated, fully sealed structure, safe and reliable, easy to operate, maintenance-free. Widely used in residential areas, high industry centers, factories and mining enterprises, airports, stations, schools and other places.

The high voltage part adopts fully insulated high voltage inlet and outlet terminals and cable accessories, so that there is no exposed live part in the high voltage interval, with safe and reliable operation characteristics; Double pressure fuse protection, the plug-in fuse has the characteristics of temperature and current double sensitive protection, backup fuse to protect the transformer fault; At the same time, it has a complete range of operating inspection instruments, such as pressure gauges, pressure valves, oil level gauges, oil temperature gauges, etc.

The low voltage part is equipped with a comprehensive parameter tester to measure voltage, current, active power, reactive power, temperature and other parameters at a fixed point. Installed user automatic meter reading device, can automatically copy the power consumption of all low-voltage users of this transformer through carrier or wired mode; Low-voltage power distribution is equipped with phase loss protection function, which can detect phase loss and encourage each user to prevent the harm caused by non-full-phase operation; The low pressure cabinet is equipped with a fan, which automatically throws and exhauts heat according to the temperature, starting at 45℃ and returning at 40℃.

1.2 Technical Specification

150 KVA liquid filled transformer specification and data sheet

1.3 Drawings

150 KVA liquid filled transformer diagram drawing and size.

02 Manufacturing

2.1 Core

The core material is made of high-quality cold-rolled grain-oriented silicon steel sheet. Silicon steel itself is a magnetic substance with strong magnetic permeability. In the energized coil, it can produce a large magnetic induction intensity, which can reduce the volume of the transformer. We know that the actual transformer is always in the AC state, and the power loss is not only in the resistance of the coil, but also in the core of the alternating current magnetization. Usually the power loss in the iron core is called iron loss, iron loss is caused by two reasons, one is magnetic loss, one is eddy current loss. Magnetic loss is the iron loss caused by magnetic phenomenon in the magnetization process of the core, and the size of this loss is proportional to the size of the area surrounded by the magnetic loop of the material. The magnetic loop of silicon steel is narrow, and the magnetic loss of the core of the transformer with it is small, which can greatly reduce its heating degree.

2.2 Winding

Low voltage foil winding ● Axial current distribution adjusts freely ● Reduces shearing forces ● After winding, the Prepreg is stuck over the conductor sheet to form a compact tube by a tempering process. High voltage winding ● Fully and semi-automatic winding machines ● Enamel-insulated winding wire with steady winding pull on carrier cylinder, or directly on the LV winding ● Layer insulation of high-quality cable paper ● Covering bandage made of shrinking foil for compact winding with good short-circuit response and optimum impulse voltage distribution

2.3 Tank

Our company uses high-quality stainless steel as the raw material for the production of fuel tanks, and uses hydraulic machinery or other forming equipment to bend, cut and press the steel plate into the desired shape of the fuel tank. Butt the components and perform gas shielded welding or other welding processes to ensure the tightness and structural strength of the tank. All seals are sealed at the end limit; The metal parts inside and outside the box are rounded to remove hair, and the weld seam and seal are tested for three times (fluorescence, positive pressure, negative pressure leakage test); The paint is made according to the standard anti-rust requirements.

2.4 Final Assembly

The structure of the liquid filled transformer is divided into two parts, the front is the wiring cabinet, the wiring cabinet includes high and low voltage terminals, high voltage load switch, plug-in fuse, high pressure tap changer operating handle, oil taste meter, oil temperature meter, etc.; The rear is the oil box and heat sink, transformer winding, iron core, high voltage load switch, plug-in fuse are in the tank body. Load switches, fuses, and transformers are immersed in transformer oil. Install the terminal on the housing, put the assembled iron core into the oil tank, fix the screws after the iron core is put in, and install the high voltage fuse. After all the above steps are completed, fill the oil tank.

03 Testing

Pad mounted transformer test is mainly divided into the following links: appearance inspection, electrical function test, winding insulation resistance test, load loss test, temperature rise test and operation test.

1. Appearance inspection: The appearance inspection of the American box is carried out to check whether the box, winding, insulation material, etc., is intact.

2. Electrical function test: Use electrical testing instruments to test and check the electrical performance of American box transformer, including wiring, insulation resistance, winding turn resistance, voltage test, casing current and other checks.

3. Winding insulation resistance test: Use insulation testing equipment to test and check the winding insulation resistance of the American box.

4. Load loss test: Draw a small amount of current according to the rated load of the American box transformer to check whether the loss and efficiency of the box transformer meet the design requirements.

5. Temperature rise test: adjust the input voltage and load of the American box, observe the running state of the box, test the winding temperature rise, body temperature rise, oil temperature, etc.

6. Operation test: the American box transformer for a long time running test, constantly adjust the input voltage, load size, etc., to check the performance and stability of the box transformer.

04 Packing and Shipping

05 Site And Summary

Thank you for your interest in our three-phase pad-mounted transformer! With its highly efficient and reliable performance, compact and aesthetically pleasing design, and exceptional safety features, this product has become an ideal choice for industrial, commercial, and public power distribution systems. We are committed to providing comprehensive power solutions and premium services to meet the evolving demands of the market. No matter the needs of your project, we are here to support your success with professionalism and dedication. We look forward to establishing a long-term partnership with you and advancing efficiency and sustainability in the power industry together! For more information, please feel free to contact us anytime!