60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer
The 60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer is designed for regional 35–50 kV distribution networks and industrial substations. It adopts 99.99 % electrolytic pure copper windings, Class A insulation, corrugated tank + ONAN natural cooling, and energy-saving S11/S13 core with up to 40 % lower no-load loss. Standard vector groups Dyn11 or Yyn0, off-circuit tap changer ±5 % or ±2×2.5 % (on-load optional). Fully compliant with IEC 60076, lightning impulse 250 kV peak, PD <10 pC. Fully sealed or conservator design prevents oil aging and moisture ingress. Low noise ≤58 dB, strong short-circuit withstand, suitable for high-altitude and harsh environments. Vacuum oil filling + nitrogen sealing ensures>30-year lifespan. Widely used in mining, petrochemical, renewable energy, and urban 50 kV networks.
- Primary Voltage Ratings 69kV 66kV 60kV or others
- Secondary Voltage Ratings 33/13.8/11 kV or customized
- H.V. Tap Range ±8×1.25% or others
- Type Oil-immersed power transformer
- BIL Up to 350kV
- Standards IEEE, ANSI, IEC, CSA
- Application railway electrification, urban compact substations, and heavy industrial parks
- Power Rating 100–5000 kVA
- Certificate UL ,CESI ,ISO
- Cooling Method ONAN/ ONAF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer
Technical Specifications
Accessories
| Rated Power | 100 - 5000kVA |
| Rating Primary Voltage | 69kV 66kV 60kV or others |
| Secondary Voltage |
33kV 13.8kV 11kV Customized |
| Frequency | 50/60Hz |
| Vector Group | Dyn11, YNd1, Dyn1, YNd11 or others |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE, CAS Std or Customized |
| Impedance Voltage | As IEC |
| Altitude | ≤1,000m or Customized |
| Enclosure material | Mid Steel |
| HV Bushing |
| LV Bushing |
| OLTC/NLTC |
| Lifting hook for complete transformer |
| Name plate |
| Oil temperature |
| Winding temperature |
| Radiators |
| Oil level |
| Pressure relief valve |
| CT |
Customization Optional
60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer
The 60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer provides unparalleled flexibility to align with diverse grid and industrial demands. Capacity options span 500–10000 kVA, utilising 100% high-purity electrolytic copper windings for superior conductivity and thermal stability, or hybrid copper-aluminium for cost optimisation without compromising performance. Core designs include S11, S13, or S20 ultra-low-loss amorphous steel variants, reducing no-load losses by up to 50% for energy-intensive applications. Primary voltage configurations cover 60±5%, 55 kV, or 66 kV classes, with secondary outputs at 11 kV, 13.8 kV, 10.5 kV, 6.3 kV, 0.69 kV, or 0.4 kV, including dual-voltage or tertiary winding setups for advanced load balancing. Vector groups default to Dyn11 or Yyn0, but can be customised to Dyn5, YNd11, or proprietary connections for specific harmonic mitigation. Tap changer selections feature off-circuit ±2×2.5% or ±5% as standard, with on-load variants (±8×1.25% or ±10×1%) incorporating vacuum interrupters or resistor diverters for seamless voltage regulation under load. Cooling systems range from pure ONAN natural convection to ONAF with multi-stage automatic fan banks, or ODAF forced oil circulation for high-overload scenarios (up to 150% for 2 hours). Tank enclosures offer fully sealed corrugated fins for compactness, conservator types with flexible bladders to minimise oxidation, or modular detachable radiators for simplified field maintenance and transport.
Beyond core specifications, advanced customization enhances safety, monitoring, and adaptability. Integrated current transformers (CT) and potential transformers (PT) in dedicated bays support metering and protection schemes, while fiber-optic sensors provide real-time hot-spot temperature profiling across 10–16 winding points with 0.1°C accuracy. Online diagnostics include dissolved gas analysis (DGA) with hydrogen/nitric oxide detection, relative humidity/moisture transducers in oil, and predictive analytics via edge computing modules. Protection features encompass sudden pressure relays with dual trip/alarm circuits, pressure relief vents rated to 2.5 bar, and arc-fault detection for internal fault quenching. Enclosure options include IP54/IP65 weatherproof housings with acoustic barriers for noise reduction (<55 dB), high-altitude derating (>5000 m) with enhanced insulation, seismic anchoring up to 0.6g, extreme climate adaptations (-60°C arctic or +55°C tropical with anti-condensation heaters), and marine-grade C5-M/C5-X epoxy coatings for offshore or coastal deployment. Smart grid integration supports SCADA via Modbus RTU/TCP, DNP3, or IEC 61850 protocols, including remote OLTC control and IoT-enabled asset management. Every bespoke configuration adheres rigorously to IEC 60076-1/11, GB/T 1094, and IEEE C57.12.00 standards, backed by comprehensive type, routine, and special test reports from accredited labs like KEMA or CESI, ensuring seamless commissioning and optimal lifecycle performance in any 60 kV transmission or distribution ecosystem.
Packing and Shipping
60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer
Immediately after FAT approval, the transformer is subjected to final vacuum dehydration (<0.5 mbar, 72–96 h) and hot-oil circulation until moisture ≤6 ppm and dielectric strength ≥75 kV/2.5 mm. The tank is then filled with 99.999 % ultra-dry nitrogen to 0.03–0.04 MPa positive pressure and hermetically sealed. A high-precision digital pressure & temperature data logger (90-day memory, 1-minute sampling) is permanently mounted on the conservator pipe to provide continuous proof of internal integrity throughout transit. All valves are double-sealed with tamper-evident caps, and silica-gel breathers with oil-seal pots are fitted. Nitrogen purity certificate, pressure trend report, and vacuum retention certificate are included in the shipping dossier, guaranteeing zero insulation degradation even on 60-day ocean voyages.
All 60 kV porcelain bushings, neutral bushing, conservator, detachable radiator banks, OLTC drive mechanism, cooling fans, Buchholz relay, oil level gauges, temperature indicators, sudden pressure relay, and marshalling box are professionally dismantled and individually packed in custom IPPC-fumigated marine-plywood crates lined with ≥60 mm high-density anti-shock foam and 300 kg of colour-indicating silica-gel desiccant. Each crate carries four 3-axis shock recorders (±250 g) and two electronic tilt watches. The main tank (gross weight 22–45 tons depending on capacity) is welded onto a DNV 2.7-1 certified heavy-lift steel skid with 16 lashing points. The entire body is enclosed in a fully sealed composite crate of 28 mm marine plywood reinforced with 100×100 mm galvanised steel framing, then triple-wrapped with aluminium-foil vapour barrier and heavy-duty heat-sealed tarpaulin. Ten high-resolution impact recorders and real-time GPS/4G monitoring devices are attached.
Inland transport utilises hydraulic modular trailers or low-bed trailers with police escort (total height controlled ≤4.8 m). Sea freight is executed as break-bulk cargo under deck or on 40 ft/80 ft heavy-duty flat-rack containers with CCS/DNV-GL pre-approved lashing plans using Φ28–Φ32 mm steel wire ropes and 80-ton turnbuckles. Full documentation package includes detailed packing list, IPPC fumigation certificate, certificate of origin (Form A/E), nitrogen pressure & trend report, shock recorder baseline data, 110 % all-risk marine insurance (ICC A), third-party loading survey report, and complete installation & commissioning manual. These uncompromising procedures ensure every 60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer arrives at any global destination in perfect, immediately energizable condition with zero damage and full traceability.
All 60 kV porcelain bushings, neutral bushing, conservator, detachable radiator banks, OLTC drive mechanism, cooling fans, Buchholz relay, oil level gauges, temperature indicators, sudden pressure relay, and marshalling box are professionally dismantled and individually packed in custom IPPC-fumigated marine-plywood crates lined with ≥60 mm high-density anti-shock foam and 300 kg of colour-indicating silica-gel desiccant. Each crate carries four 3-axis shock recorders (±250 g) and two electronic tilt watches. The main tank (gross weight 22–45 tons depending on capacity) is welded onto a DNV 2.7-1 certified heavy-lift steel skid with 16 lashing points. The entire body is enclosed in a fully sealed composite crate of 28 mm marine plywood reinforced with 100×100 mm galvanised steel framing, then triple-wrapped with aluminium-foil vapour barrier and heavy-duty heat-sealed tarpaulin. Ten high-resolution impact recorders and real-time GPS/4G monitoring devices are attached.
Inland transport utilises hydraulic modular trailers or low-bed trailers with police escort (total height controlled ≤4.8 m). Sea freight is executed as break-bulk cargo under deck or on 40 ft/80 ft heavy-duty flat-rack containers with CCS/DNV-GL pre-approved lashing plans using Φ28–Φ32 mm steel wire ropes and 80-ton turnbuckles. Full documentation package includes detailed packing list, IPPC fumigation certificate, certificate of origin (Form A/E), nitrogen pressure & trend report, shock recorder baseline data, 110 % all-risk marine insurance (ICC A), third-party loading survey report, and complete installation & commissioning manual. These uncompromising procedures ensure every 60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer arrives at any global destination in perfect, immediately energizable condition with zero damage and full traceability.
32
32 years of industry experience
Manufacturer Test
60kV Dyn11/Yyn0 Pure Copper Oil-Immersed Power Transformer
Progress test
The 60kV transformer undergoes comprehensive, client-witnessable Progress Tests at every critical manufacturing stage to ensure flawless quality before final FAT.
Stage 1 (Active Part): individual coil insulation resistance and PI ≥ 2.8, HV/LV winding DC resistance at all taps, core insulation and grounding current <80 mA, preliminary no-load loss and magnetizing current measurement, turns ratio on sample coils, and embedded fiber-optic sensor calibration.
Stage 2 (Pre-Tanking): complete voltage ratio test at all tap positions (tolerance ≤ ±0.5 %), vector group Dyn11 or Yyn0 verification, polarity, zero-sequence impedance, magnetic balance, and low-voltage recurrent surge test to detect turn-to-turn faults.
Stage 3 (After Vapor-Phase Drying & Vacuum Oil Filling): 48-hour stabilization monitoring, final insulation resistance >18,000 MΩ, tanδ ≤ 0.0035 (20 °C), partial discharge <8 pC at 1.5 μm/√3, oil BDV ≥75 kV/2.5 mm, moisture ≤7 ppm, and full DGA baseline with total combustible gas <0.08 %.
Design Tests
All transformers will be tested after finishing the production test items as below:
♦ Leak testing with pressure for liquid-immersed transformers
♦ Test of transformer oil
♦ Measurement of voltage ratio and check of phase displacement
♦ Measurement of winding DC resistance
♦ Measurement of d. c. Insulation resistance between each winding to earth, and check of the core and frame insulation
♦ Capacitive bushing test
♦ Measurement of dissipation factor (tan δ) of the insulation system capacitances, and determination of capacitances windings-to-earth
♦ Measurement of no-load loss and current at 90%,100%,110% of rated voltage
♦ Operation test on on-load tap-changer
♦ Measurement of short-circuit impedance and load loss
♦ Lightning impulse test
♦ Induced-voltage test with partial discharge measurement
♦ Auxiliary wiring check
♦ Current transformer test
♦ Frequency response analysis test
Transformer Factory Acceptance Test
FAT is conducted strictly according to IEC 60076-1/3/5/11 with full client or third-party (SGS/BV/KEMA) witness and officially signed protocol.
Tests comprise: winding resistance at all taps corrected to 75 °C; voltage ratio, polarity and phase displacement at principal/extreme taps (≤ ±0.5 %); vector group Dyn11/Yyn0 and magnetic balance confirmation; no-load loss and current at 90 %, 100 %, 110 % rated voltage; load loss and impedance at 75 °C/rated current; separate-source applied voltage withstand; induced overvoltage withstand with PD measurement (<10 pC at 1.5Um/√3, <5 pC at Um/√3); full-wave lightning impulse 275–325 kV peak on 60 kV side; insulation resistance, PI ≥ 2.8, tanδ ≤ 0.0035, oil BDV ≥ 75 kV; temperature-rise test (when specified); OLTC full operation with 10 load cycles + 100 auxiliary cycles; functional verification of cooling stages, Buchholz relay, sudden pressure relay, fiber-optic temperature system, and SCADA interface; sound level measurement (<60 dB); final visual inspection, painting quality, nameplate accuracy, and nitrogen pressure check.
Complete raw data, calibration certificates, and oscillograms are provided. The transformer is only released for packing after the client's signature, guaranteeing 100 % readiness for immediate energization and long-term reliable service in 60 kV networks worldwide.
Routine Test - Test of transformer oil
Purpose of Testing
The purpose of testing transformer oil is to evaluate its condition and ensure it is still effective in providing insulation and cooling for the transformer. This test helps detect contaminants such as moisture, gas buildup, or impurities, which can compromise the oil’s performance and, consequently, the transformer’s reliability and longevity. Regular oil testing enables early detection of potential issues, allowing for corrective actions to prevent transformer failure.
Testing Equipment
Dielectric Strength Tester: Measures the insulating capacity of the oil by applying high voltage.
Dissolved Gas Analyzer (DGA): Detects gases in the oil that indicate internal faults.
Acid Value Tester: Determines the oil's acidity to check for oxidation.
Dissolved Gas Analyzer (DGA): Detects gases in the oil that indicate internal faults.
Acid Value Tester: Determines the oil's acidity to check for oxidation.
Pre-Test Preparation
Disconnect the transformer from the electrical grid to avoid any electrical hazards during testing.
Prepare oil sampling kits, testing instruments (e.g., dielectric strength tester, gas analyzer), and clean containers for oil samples.
Ensure all personnel are equipped with necessary safety gear, such as gloves, goggles, and protective clothing.
Visually inspect the oil for signs of contamination or abnormal color before collecting samples.
Prepare oil sampling kits, testing instruments (e.g., dielectric strength tester, gas analyzer), and clean containers for oil samples.
Ensure all personnel are equipped with necessary safety gear, such as gloves, goggles, and protective clothing.
Visually inspect the oil for signs of contamination or abnormal color before collecting samples.
Test Progress
Oil Sampling:
Carefully extract oil samples from the transformer at specific locations (such as the oil conservator or top of the tank) to ensure accurate representation of the oil’s condition.
Chemical and Gas Analysis:
The pressure is maintained for a set period (usually 30-60 minutes) to observe if there is any drop in pressure, which could indicate a leak.
Carefully extract oil samples from the transformer at specific locations (such as the oil conservator or top of the tank) to ensure accurate representation of the oil’s condition.
Chemical and Gas Analysis:
The pressure is maintained for a set period (usually 30-60 minutes) to observe if there is any drop in pressure, which could indicate a leak.
Test Standard
IEC 60076 Oil-immersed power transformers
ASTM D1816 Dielectric Breakdown Voltage of Insulating Liquids
ASTM D1816 Dielectric Breakdown Voltage of Insulating Liquids
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
60 kV regional substations, large mining & cement plants, petrochemical complexes, wind/solar farm step-up, port & railway electrification, urban compact substations, and heavy industrial parks requiring reliable 11 kV/0.4 kV supply with minimum maintenance.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
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What is a Transformer?A transformer is an electrical device used to change the voltage of alternating current (AC). It works on the principle of electromagnetic induction, converting high-voltage current into low-voltage current or low-voltage current into high-voltage current. Transformers are widely used in power transmission, distribution systems, and various electronic devices.
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What are the main uses of a transformer?The main use of a transformer is voltage conversion. Transformers are used in power transmission systems to help transfer electricity from power plants to consumers. In addition, transformers are also used in electronic devices such as chargers, televisions, power adapters, etc., to adjust the voltage to meet the requirements of different devices.
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Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
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