S-35kV series oil immersed transformer produced by the company is suitable for three-phase AC 50 / 60Hz, rated voltage 35kV distribution grid, and plays an important role in high-voltage transmission and low-voltage power supply. Products with high efficiency, low loss characteristics, can save a lot of power consumption and operating costs, social benefits, have been widely used in power plants, substations, industrial and mining enterprises, ports, airports and other places. With on load tap changer, the product can realize the function of manual or automatic voltage regulation without power failure, which is conducive to stabilizing the voltage of power grid in each load center and improving the quality of power supply.
Lots Transformer Electric is a professional manufacturer specializing in the production of high-quality transformers for the electrical sector. Our products are designed to be the best in the industry, thanks to our meticulous engineering standards and precise manufacturing processes. During the production process, we use a range of components with specific technical specifications.
Firstly, we utilize tap changers in our transformers to adjust the transformer input voltage from medium voltage to grid voltage. This mechanism can be used when the transformer is de-energized, and adjustments can be made either from the transformer’s top cover or remotely.
Regarding short-circuit voltage, our standard transformer manufacturing includes options for short-circuit voltages of 4.5% for 36/0.4kV transformers up to 630kVA and 6% for transformers with power ratings from 800-2500 kVA. We can manufacture transformers with different short-circuit voltage levels based on customer requirements.
In terms of frequency, our standard transformer manufacturing is calculated for a frequency of 50 Hz. However, we can produce transformers at different frequencies upon customer request.
For overvoltage situations, our transformers are designed to operate at 5% overvoltage. Additionally, transformers produced in the Yzn and Dyn connection groups are designed to be fully loaded with nominal currents at the star points.
Our standard production transformers are designed to operate at altitudes of up to 1000 meters above sea level. However, we can manufacture transformers for higher altitudes upon customer request.
The ambient temperature for our standard transformers is designed to be a maximum of 40°C, with a daily average of 35°C and an annual average of 20°C. Transformers are designed to operate at altitudes of up to 1000 meters above sea level. However, we can produce transformers for operation at altitudes above 1000 meters upon customer request.
In our standard transformers, the transformer oil temperature rise is set at 60K, and the transformer winding temperature rise is set at 65K. However, we can undertake projects with different temperature rise specifications based on customer-specific requirements.
We operate with a commitment to excellence, and therefore, we carefully design each feature of our products. Our top priority is to ensure that our transformers deliver optimal performance under all conditions. That’s why, at every stage of our production process, we make efforts to meet customer requirements and the expected quality standards.
TAP SWITCH:
This is a mechanism for power transformers for regulation of the input voltage to required levels.(operates off-load). This is normally achieved by changing the ratios of the transformers on the system. This mechanism can either be controlled remotely or via dashboard which is on the tap of the device. Unless specifically requested by the customer, all transformers are manufactured in our factory as a standard 5-stage segment. Level change process:+ / – 5%, + / – 2 x 2.5% or can be produced on customer demand.
VECTOR GROUPS:
Vector group Yzn5 or Yzn11 transformers are manufactured in our factory as a standard up to 25-160kVA.
Vector group Dyn5 or Dyn11 transformers are manufactured in our factory as a standard up to 250-5000 kVA.
Other vector groups are available on demand.
SHORT-CIRCUIT VOLTAGE (UK)
For the standard transformer productions, 36 / 0,4 kV and 25-630kVA power is 4.5% , from 800 to 2500 kVA power is 6% .
Other short circuit voltages can be produced on demand.
FREQUENCY:
Frequency of 50Hz is a standard for transformer production. Different frequency transformers can be produced on demand.
OVERVOLTAGE:
Our transformers are designed to operate up to 5% over-voltage.
CONDITIONS OF BALANCE LOADING:
We produce standard Yzn and Dyn transformers that star-points can be fully loaded with nominal current.
TRANSFORMERS OPERATING HEIGHT:
Operating height is up to 1000 meters above sea level for the standard transformers.
Over 1000meter transformers can be produced on demand.
TEMPERATURE RISE:
For Standard production of the transformers
| Environmental temperature max | : 40 C |
| Per day | : 35 C |
| Annual avg. | : 20 C |
| Height | : 1000 m |
| Transformer oil temperature rise | : 60 K |
| Transformer winding temperature | : 65 K |
Different transformers are designed on demand.
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