

35kV High-Voltage On-Load Tap-Changing Highland Power Transformer

Name: 35kV High-Voltage On-Load Tap-Changing Highland Power Transformer
Brand: Zhejiang Tenrony Electricity Co., Ltd.
Availability: InStock

The S20 series fully sealed oil-immersed power transformers have the advantages of low loss, low noise, and high efficiency, and can achieve good energy-saving effects and reduce pollution. Compared with ordinary oil-immersed transformers, fully sealed oil-immersed transformers eliminate the oil storage tank. The change in oil volume is automatically regulated and compensated by the elasticity of the corrugated plates in the corrugated oil tank. The transformer oil is isolated from the air, preventing and slowing down the deterioration of the transformer oil and insulation aging, enhancing operational reliability, and requiring no maintenance during normal operation. Feel free to contact Tenrony and directly order from the power transformer factory.

Products

Features

The transformer core is made of imported cold-rolled silicon steel sheets stacked together, which significantly reduces the no-load and no-load current. The core is also bound to ensure on-load tap changer transformer's tightness and reduce noise.

The high and low voltage windings are wound with oxygen-free copper. For the low voltage windings of 500 kVA and below, a double-layer cylindrical structure is adopted; for 630 kVA and above, a double-helical or four-helical structure or copper foil winding is used. The high voltage windings adopt a multi-layer cylindrical structure.

The transformer connection group adopts Dyn11 to reduce the impact of harmonics on the power grid and improve the power supply quality.

The transformer adopts a fully sealed structure, which extends on-load tap changer transformer service life, eliminates the need for core lifting, and requires no maintenance.

Measured noise value: Low-voltage standard.

After normal transportation of this series of transformers, there is no need for core lifting inspection. Relevant components can be installed, and acceptance project tests can be conducted. Once qualified, they can be put into operation.

Technical Parameters

Main Technical Parameters
Rated capacity (kVA)	Connect groups	Voltage combination(KV)			No-load loss W	Load loss W	No-load current(%)	Short-circuit impedance(%)
Rated capacity (kVA)	Connect groups	voltage	Tapping range	Low voltage	No-load loss W	Load loss W	No-load current(%)	Short-circuit impedance(%)
630	Yd11	35	±5%	3.15 6.3 10.5	830	7870	1.10	6.5
800					980	9410	1.00
1000					1150	11540	1.00
1250					1410	13940	0.90
1600					1700	16670	0.80
2000					2180	18380	0.70
2500					2560	19670	0.60
3150		35~38.5	±5%	3.15 6.3 10.5	3040	23090	0.56	7.0
4000					3620	27360	0.56
5000					4320	31380	0.48
6300					5250	35060	0.48	7.5
8000	Ynd11	35~38.5	±5% or ±2×2.5%	3.15 3.3 6.3 6.6 10.5 11	7200	38500	0.42
10000					8700	45300	0.42
12500					10080	53900	0.40	8.0
16000					12160	65800	0.40
20000					14400	79500	0.40
25000					17020	94100	0.32
31500					20220	112900	0.32

Applications

Based on its high reliability, low loss, strong short-circuit resistance, and efficient heat dissipation, this oil-immersed power transformer is mainly suitable for power system scenarios that have high requirements for power supply stability, energy efficiency, and equipment durability. Specifically, it can be applied in:
Power transmission and distribution: As the main transformer in regional power grids, on load tap changing transformer is used for voltage reduction or increase at the 35kV voltage level, connecting power grids of different voltage levels, and ensuring power transmission in urban power grids, industrial park power grids, etc.
Industrial and infrastructure: On load tap changing transformer is suitable for large industrial plants (such as manufacturing factories, heavy industrial bases), industrial parks, and other scenarios that require a stable, high-power supply. On load tap changer transformers can also be used in infrastructure power systems with high requirements for equipment reliability (such as power grids for large transportation hubs, power supply systems for key public buildings, etc.).
Other specialized power scenarios: an on-load tap changer transformer is suitable for power projects that have clear requirements for transformer impact resistance and low loss, especially for power nodes that need long-term stable operation and reduced maintenance intervention.

Advantages

Performance Reliability Advantage:
The core strength lies in on load tap changing transformer short-circuit resistance, which has been verified by national authoritative testing (passing the sudden short-circuit test in one attempt). The structural design of the high and low voltage coils and the core further enhances the stability of the equipment under complex working conditions, reducing operational risks.
Energy Efficiency and Heat Dissipation Advantage:
The vertical oil duct design significantly improves heat dissipation efficiency, effectively reducing the temperature difference between the copper and oil as well as the temperature rise at the hottest point within the coil, thus avoiding premature equipment aging due to overheating. Additionally, its low-loss feature helps reduce energy waste and enhance the overall energy efficiency of the power system.
Structural and Compatibility Advantage:
The robust frame structure not only enhances the equipment's resistance to shock during transportation, facilitating on load tap changing transformer's transfer before installation and deployment, but also ensures long-term operational accuracy through a stable core clamping force. Moreover, its low noise characteristic makes it suitable for environments with noise control requirements.