Oil Filled Pad Mounted Transformer 1000kva

Wenzhou XiFa Electric Power Equipment Co., Ltd has been dedicated to transformer research and manufacturing for nearly 20 years. We have a modern factory covering 12,000 square meters and core equipment such as fully automatic iron core shearing line and vacuum casting machine. Oil filled pad mounted transformer 1000kva complies with the national first energy efficiency standards. Before leaving the factory, each transformer must undergo a series of rigorous tests such as partial discharge tests and sudden short circuit tests, to ensure low loss, low noise and long lifespan.

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Product Description

Oil filled pad mounted transformer 1000kva is a three phase distribution transformer specially designed for outdoor ground installation with a rated capacity of 1000 kva. It is directly installed on the precast concrete foundation, rather than be suspended or buried underground. The iron core and windings are completely submerged in insulating oil, utilizing the high dielectric strength and heat dissipation properties of the oil to achieve electrical insulation and thermal management.

The shell of oil filled pad mounted transformer 1000kva is made of corrugated oil tank, and the heat dissipation surface is increased by using corrugated plates, achieving ONAN cooling. The elastic property of the waves can absorb the volume expansion of the insulating oil caused by temperature changes. Its fully sealed structure ensures that the insulating oil does not come into contact with the external air, effectively preventing the deterioration of the oil quality and the aging of the insulating materials due to the intrusion of oxygen and moisture.

The entire structure of oil filled pad mounted transformer 1000kva is composed of three separate compartments: the high voltage room, the low voltage room, and the transformer room. The door of the low voltage room is equipped with a three point lock. The door of the high voltage room can only be opened after the door of the low voltage room is opened to prevent live operation on the high voltage side. Both the high voltage and low voltage sides are equipped with NEMA grounding terminals.

In terms of electrical and protection configuration, this oil filled pad mounted transformer 1000kva supports various connection groups such as Dyn11, Yyn0, which are suitable for different load characteristics. The high voltage side integrates dual protection of load switch and fuse, and is equipped with pressure release valve, oil temperature and oil level monitoring. It meets the DOE 2016 energy efficiency standard, with an efficiency of ≥ 99.2%, and is safe and reliable.

Oil Filled Pad Mounted Transformer 1000kva

Technical parameter

Product name	Oil filled pad mounted transformer 1000kva
Primary voltage	13200Grdy/7620V
Secondary voltage	480Y/277V
Phase	3
Vector group	YNyn0/Dyn11
Cooling method	ONAN
Frequency	60Hz
Standard	IEEE
open circuit losses	≤1300 W
load loss	≤10500 W

A industrial park intends to purchase a oil filled pad mounted transformer 1000kva, which will mainly supply power to three phase asynchronous motors, water pumps, and other power equipment. The three phase load is basically balanced, but the on site environment has a lot of dust, and the transformer is required to have a relatively low initial procurement cost. Should the connection group be prioritized as Dyn11 or Yyn0? Why?

Based on the performance comparison, the Dyn11 connection group should be the preferred choice. In terms of the ability to resist three phase unbalance, Dyn11 allows the neutral line current to reach over 75% of the phase current, while Yyn0 typically limits it to within 25%; in terms of harmonic suppression, the high voltage side triangle connection of Dyn11 can provide a circulating path for the third harmonic, effectively avoiding voltage waveform distortion, while Yyn0 has a relatively average suppression capability; in terms of single phase grounding fault current, Dyn11 generates a larger fault current, which is easier for relay protection to reliably detect and act, while the fault current of Yyn0 is relatively smaller, making the protection configuration more difficult.

Overall, Dyn11 is more suitable for scenarios involving modern mixed loads such as LED lighting, variable frequency air conditioners, and charging piles, while Yyn0 is only suitable for three phase strictly balanced pure power loads and projects that are highly sensitive to cost. Therefore, under no special restrictions, the connection group of the oil filled pad mounted transformer 1000kva should be prioritized as Dyn11.