110kv transformer
Excellent insulation performance, strong ability to withstand high voltage, and safe and reliable operation.
Low loss level, significant energy-saving effect, and reduced long-term operating costs.
Strong short-circuit resistance and impact resistance, stable mechanical structure, and longer service life.
Wide voltage regulation range, adapts to grid voltage fluctuations, and has good power supply stability.
Strict control of partial discharge, low noise level, and superior environmental performance.
Customizable connection groups and capacities to meet the needs of different power grids and working conditions.
Product Details
Product Advantages of 110kV Power Transformer
I. Excellent Insulation Performance to Ensure Safe High-Voltage Operation
High-grade premium insulation materials are adopted. Key insulation components use imported Nomex insulating paper, high-strength epoxy castings and high-voltage insulating oil (for oil-immersed transformers), ensuring reliable insulation performance.
Strict processes including vacuum drying and vacuum impregnation are applied during production to thoroughly remove moisture and impurities inside insulation materials, avoiding moisture absorption and aging. Partial discharge tests are conducted in strict accordance with GB/T 1094.1‑2013 and IEC 60076 standards, with partial discharge controlled below 50pC.The insulation strength can stably withstand the rated 110kV voltage and resist transient overvoltages such as switching overvoltage and lightning overvoltage, with lightning impulse withstand voltage up to 350kV and above.
The insulation structure is optimized with precise control of insulation thickness between winding layers and turns, together with segmented insulation wrapping technology, which effectively eliminates hidden troubles such as insulation aging, breakdown and leakage. The transformer ensures stable performance under long‑term high‑voltage and continuous operation, greatly reducing the risk of shutdown and maintenance caused by insulation failures.
II. Low Loss & Energy‑Saving Design to Reduce Long‑Term Operating Costs
High-efficiency energy-saving design is adopted for core components to minimize power loss.The core uses high‑permeability, low‑loss oriented silicon steel (such as 30Q120, 27Q130) with thickness of 0.27mm–0.30mm. The step‑lap stacking process is applied to reduce magnetic resistance and no‑load loss.
Windings adopt high‑purity oxygen‑free copper conductors with tin‑plated surface to lower contact resistance. The winding arrangement and manufacturing process are optimized to reduce conductor length and load loss.
The actual measured no‑load loss and load loss both meet China’s Class 1 energy efficiency standard. Compared with conventional 110kV transformers, power loss is reduced by 15%–20%.For a 100MVA transformer operating 8,760 hours per year at 0.6 RMB/kWh, it can save about 100,000–150,000 RMB on electricity annually and reduce CO₂ emissions by about 80–120 tons per year, fully complying with national energy conservation and “dual carbon” strategies.
III. Strong Anti‑Interference Ability for Complex Grid Conditions
The mechanical structure is verified through strict design, simulation and field tests.Windings adopt rigid fixing structure with high‑strength binding tapes and end supports to enhance mechanical strength, which can withstand huge electromagnetic force during short‑circuit faults and avoid deformation, displacement or damage. Short‑circuit withstand capability meets GB/T 1094.5‑2019.
Symmetrical magnetic circuit is applied to reduce leakage flux and improve anti‑electromagnetic interference performance.The transformer can operate stably under voltage fluctuation (within ±10%), load sudden change (≤30% rated load), and harsh weather including high temperature, rainstorm and snowstorm, ensuring continuous and reliable power supply for heavy industry, remote areas and new energy integration.
IV. Wide‑Range Voltage Regulation for Stable Power Quality
High‑precision voltage regulation devices are available in two types: on‑load tap changer and off‑circuit tap changer.
On‑load tap changers adopt vacuum interrupter structure, with wide regulation range (usually ±8% or ±10%) and up to 17 or 21 steps. Voltage regulation can be performed under full load without power interruption, with response time ≤5s and output voltage accuracy within ±0.5%.
Off‑circuit tap changers feature reliable structure with regulation range up to ±8%, suitable for applications without continuous voltage adjustment.This design effectively solves voltage drop in long‑distance transmission (especially lines over 100km), providing stable voltage for industrial loads, residential users and new energy power stations.
V. Low Noise & Eco‑Friendly for Various Installation Scenarios
Three noise reduction measures are adopted:
Optimized core structure and low‑noise silicon steel to reduce magnetostrictive noise;
High‑performance damping pads between core, windings and tank to absorb vibration;
Thickened tank wall and enhanced sealing to reduce noise radiation.
For 31.5MVA–100MVA models, operating noise is below 60dB; for 120MVA–250MVA models, below 65dB, much lower than GB 12348‑2008 limits.
In terms of environmental protection, oil‑immersed types use eco‑friendly insulating oil such as natural ester oil, non‑toxic and biodegradable. Dry‑type types are oil‑free with zero pollutant emission. Partial discharge is controlled below 50pC without excessive electromagnetic radiation, meeting green and low‑carbon development trends.
VI. Reasonable Structure, Easy Maintenance & Long Service Life
Compact structure design optimizes the layout of tank, core and windings, reducing volume by 10%–15% compared with traditional models, saving installation space for outdoor, indoor and underground substations.Modular design allows split transportation and fast on‑site assembly, lowering transport and construction costs.
Key parts use anti‑corrosion, anti‑oxidation and anti‑wear materials. The tank is treated with sandblasting and electrostatic spraying. The transformer can adapt to high temperature (up to 40°C), high humidity (≤95RH), dust and salt‑fog environments. Under normal maintenance, service life exceeds 30 years.
Humanized maintenance design is equipped with convenient inspection ports, oil sampling outlets and temperature measuring ports. Core components such as tap changers and cooling systems can be disassembled and repaired independently without full shutdown, simplifying maintenance and reducing downtime.
VII. Customizable Solutions to Meet Diverse Grid Requirements
The transformer is highly customizable according to customer demands, grid parameters and application scenarios.
Capacity: 31.5MVA to 250MVA
Connection groups: YNd11, Yyn0, Dyn11, etc.
Cooling modes: ONAN, OFAF, ODAF for oil‑immersed; dry‑type for indoor, high‑altitude and fire‑proof sites.
Intelligent monitoring modules can be integrated, including temperature, oil level, partial discharge and vibration sensors, realizing real‑time data transmission, remote monitoring, early warning and fault diagnosis for smart grids and intelligent substations.
Customized versions for earthquake resistance, salt‑fog resistance and high‑altitude (≥2000m) applications are also available to meet special working conditions.
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