35KV S22 Oil Immersed Transformer 50-5000KVA

S22 series 35kV three-phase dual-winding off-circuit tap-changing oil immersed power transformer covers rated capacity from 50kVA up to 5000kVA,high voltage rated 35kV,standard secondary voltage 10.5kV/0.4kV,50Hz frequency.It is Grade 1 ultra-high energy efficiency transformer complying with GB20052-2024&IEC60076 international standards,upgraded generation based on S11/S20 series with optimized electromagnetic design.

Adopts high-grade grain-oriented cold rolled silicon steel core and full oxygen-free copper winding,widely used for 35kV substation,photovoltaic/wind farm step-down station,industrial mining power supply,urban&rural grid upgrading,large commercial park and new energy power distribution projects.

Model Definition

S:Three-phase;22:Grade 1 high-efficiency energy efficiency code;standard suffix M=fully sealed corrugated tank;off-circuit tap changer as standard configuration

2.Core Product Advantages

Top-tier Grade 1 energy saving,ultra-low loss

No-load loss reduces 18%~25%vs S13 transformer,load loss cuts 6%~10%against S20 standard,obvious annual electricity saving for long-term continuous operation,fully meets global carbon neutrality and energy-saving grid policies.Optimized multi-step skew-laminated core minimizes no-load current below 0.6%for large-capacity models.

Excellent short-circuit withstand performance&stable running

All-copper enameled winding with balanced ampere-turn layout,reinforced internal insulation structure;whole active part fixed by anti-loose clamping fixture to avoid coil displacement under sudden short-circuit surge,passed full short-circuit withstand type test per IEC60076-5.Standard vector group Dyn11 effectively suppresses grid harmonic interference and improves power supply quality.

Dual tank design,zero oil leakage&low maintenance

Small capacity(≤1600kVA):Fully sealed corrugated radiator tank without conservator,vacuum oil filling isolates insulating oil from air to prevent oxidation and moisture ingress.

Large capacity(≥2000kVA):Bell-type tank with standard conservator+diaphragm oil storage,plate fin radiator,optional external cooling fan for enhanced heat dissipation.

All flange sealing uses FKM high-temperature oil-resistant rubber to eliminate long-term oil leakage issue.

Low noise&wide environmental adaptability

Low flux density core design+shock absorption fixing,operating noise 15~20dB lower than national standard JB/T10088,applicable for high altitude,coastal salt fog,high humidity and unattended outdoor substations.Custom anti-corrosion paint for offshore and chemical plant environments.

3.Key Technical Specification

Capacity Range:50/100/160/315/500/800/1000/1600/2000/2500/3150/4000/5000kVA

Rated Voltage:HV:35kV±2×2.5%off-circuit tapping;LV:0.4kV/6.6kV/10.5kV customizable

Connection Group:Dyn11(Yyn0 optional on request)

Cooling Type:ONAN(Oil Natural Air Natural);ONAF forced air cooling optional above 2500kVA

Short-circuit Impedance:Standard 6.5%~7.5%(custom impedance available)

Executive Standard:IEC60076,GB/T1094,GB/T6451,GB20052-2024(China Grade 1 Energy Efficiency)

Insulation Class:Class A,temperature rise limit:winding≤65K,top oil≤55K

4.Standard Optional Accessories

35kV porcelain bushing,conservator,oil level indicator,pressure relief valve,winding temperature gauge,off-circuit tap switch,lightning arrestor assembly,DIN/IEC standard terminal studs.

5.Application Fields

35kV regional substation,PV/wind power booster station,mineral&chemical factory,industrial park,municipal power grid reconstruction,large shopping mall&residential complex,container-type prefabricated substation supporting use.