Ruibian (Jiangsu) Electric Power Co., Ltd. is one of the leading manufacturers and suppliers of 110kv series oil-immersed power transformers in China. With abundant experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for pricelist.
Materials & Advanced Technologies
Core Material
Domestically manufactured high-permeability laser-scribed silicon steel sheets (grades 23QG090, 23QG085 and similar), limiting core iron loss below 0.85W/kg.
Winding Conductors
High-voltage windings use paper-covered or semi-hard paper-covered copper wires; low-voltage windings adopt transposed or composite conductors to cut down eddy current and circulating current losses.
Insulating Oil
Imported or domestic extra-high voltage transformer oil (Shell Diala S4, Kunlun KT series etc.) with oxidation stability no less than 1000 hours.
Bushing Technology
110kV bushings adopt capacitive design. Internal insulation relies on oil-paper composite materials, while external insulation is made of high-temperature vulcanized silicone rubber with a weather resistance lifespan exceeding 30 years.
Core Advantages
1. Extensive capacity range: Standard models cover 10MVA up to 100MVA, with custom larger capacities available to match power grid demands of all scales
2. Outstanding short-circuit withstand performance: Finite Element Analysis (FEA) optimizes axial and radial support structures for windings, enabling the unit to withstand short-circuit electromagnetic force shocks of 25kA and above
3. High level of intelligent integration: Compatible with integrated smart sensing systems including dissolved gas monitoring, fiber optic temperature measurement, partial discharge detection and on-load tap changer operation logs, supporting connection to smart grid platforms
4. Eco-friendly construction: Optional biodegradable insulating oil and recyclable structural materials are adopted, fully complying with EU ELV Directive and RoHS 2.0 standards
5. Adaptive to new energy grid connection: It supports maximum short-circuit impedance of 16% alongside low impedance voltage regulation ratio, effectively accommodating output fluctuations of photovoltaic and wind power generation
Application Scenarios
- Provincial & Municipal Power Grids: 110kV hub substations and terminal substations
- Power Generation Plants: Step-up transformers and station service transformers for thermal, hydro, nuclear and gas-fired power stations
- New Energy Projects: Collector transformers for large integrated wind-solar-storage bases
- Ultra-Large Industrial & Mining Facilities: Iron and steel conglomerates, large petrochemical complexes, non-ferrous metal smelting plants
Packaging & Transportation
Split-body transportation
Oversized or overweight units can be shipped with the active part and oil tank separated, followed by on-site assembly and vacuum oil filling.
Oil-filled transportation
Units with capacity ≤31.5MVA may be transported pre-filled with oil under internal pressure of 0.02~0.03MPa. After delivery, a 24-hour static settling period is sufficient before handover tests.
Marine export transportation
Constructed to withstand marine climate conditions. Tank exterior surfaces receive heavy-duty anti-corrosion coating systems (epoxy zinc-rich primer plus polyurethane topcoat, total dry film thickness ≥200μm). Auxiliary components such as bushings are sealed in vacuum packages.
FAQ
Q1: Why carry out five no-load closing tests before commissioning a 110kV transformer?
A: No-load closing generates magnetizing inrush current that can hit six to eight times the rated current. Five repeated closing cycles verify coordination between the transformer and relay protection devices to eliminate false tripping risks.
Q2: How to identify damp insulation inside a transformer?
A: Comprehensive evaluation is conducted through three test indicators: insulation resistance absorption ratio (R60/R15 ≥ 1.3), polarization index (R600/R60 ≥ 1.5), and dielectric loss factor (tanδ ≤ 0.5%).
Q3: Will sensors fitted on smart transformers compromise the reliability of the main equipment?
A: No adverse impact occurs. Smart sensors are installed in non-intrusive ways or embedded fiber Bragg gratings that leave main insulation intact. They also feature self-diagnosis functions to continuously monitor their own operational status.
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