600kVA Oil Immersed Transformer
The 600kVA Oil Immersed Transformer is a robust three-phase distribution transformer designed for reliable medium-voltage power step-down in 50/60Hz AC networks, commonly with primary voltages of 11kV or 33kV. Utilizing premium grain-oriented silicon steel core (S11/S13 series) to achieve reduced no-load losses, copper or aluminum windings, and high-quality mineral oil , it minimizes load losses while providing ONAN cooling for substantial overload tolerance (up to 140% short-term). Compact design with Dyn11 vector group, BIL ratings, and pole/ground-mount flexibility ensures dependable performance, minimal energy dissipation, and seamless integration in modern distribution systems.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2, 24.94, 26.25, 33 or others
- Secondary Voltage Ratings 480/277V, 400/230V, 380/220V or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Oil immersed distribution transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA, IEC, CE
- Application Temporary Power Supply Systems, Utilities
- Power Rating 600kVA
- Certificate UL, CESI, IEEE
- Cooling Method ONAN, ONAN/ONAF, KNAN, KNAN/KNAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
600kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Rated Power | 600kVA | |
| Rating Primary Voltage | 2.4 - 34.5kV | |
| Secondary Voltage | 480/277V 400/230V 380/220V Customized |
|
| Frequency | 50/60Hz | |
| Vector Group | Dyn11, Yyn0, Dyn5 | |
| Winding Material | Aluminum/Copper | |
| Efficiency | As IEEE, Doe 2016, CAS Std or Customized | |
| Impedance Voltage | Nominal 2% or Customized 1.1 - 5.75% | |
| Altitude | ≤1,000m or Customized | |
| Color | ANSI 70 Light gray/Munsell 7GY3.29/1.5 or customized, etc | |
| Tank material | Mild Steel, 304 Stainless Steel | |
| Insulating Oil Weight | 830kg | |
| Total Weight | 2605kg | |
| Outline Dimensions（L×W×H）in. | 1900 × 1000 × 1850（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer |
| Oil level gauge |
| Oil temperature indicator |
| Pressure relief device |
| Pressure vacuum gauge |
| Lifting hook for complete transformer |
| Name plate |
| Radiators |
| Oil upper filtering valve |
| Oil drain valve with 3/8" sampler |
Customization Optional
600kVA Oil Immersed Transformer
The 600kVA oil immersed transformer allows extensive customization to accommodate diverse voltage classes, efficiency targets, and environmental/installation conditions. Primary voltages include 11kV or 33kV (with variants like 6.6kV/10kV/20kV/22kV), secondary voltages at 0.4kV, 0.415kV, 0.433kV, or tailored low-voltage configurations for specific loads. Off-circuit tap changers provide ±2×2.5% or ±5% regulation for steady voltage control, while on-load tap changers (OLTC) enable precise dynamic adjustment in variable-load scenarios. Core options feature standard grain-oriented silicon steel for balanced performance or amorphous alloy for 60-70% no-load loss cuts, boosting energy savings. Winding materials offer high-purity copper for optimal conductivity/longevity or aluminum for economical, high-reliability designs.
Additional custom features encompass enhanced cooling (extra radiators or forced air for ambient temperatures up to +50°C), insulating oils (mineral or natural ester for fire/eco compliance per IEC 61099), and tank upgrades with hermetic sealing, advanced anti-corrosion coatings (C3/C5), seismic bracing, or elevated IP protections for harsh outdoor/polluted locations. Accessories integrate oil level indicators, winding hot-spot monitors, IoT smart modules for predictive maintenance, Buchholz relays, and conservator systems if required over hermetic. Impedance (4.5-6%), vector groups (Dyn11, Yyn0, etc.), BIL levels (75kV for 11kV, 170kV for 33kV), frequency (50/60Hz), noise attenuation, and compliance with IEC 60076, GB1094, or regional efficiency tiers (e.g., EU Ecodesign) are configurable. Our engineering team collaborates to optimize for utility feeders, commercial complexes, factories, solar integrations, or urban substations, delivering solutions that maximize efficiency, minimize total costs, and ensure flawless grid compatibility.
Packing and Shipping
600kVA Oil Immersed Transformer
Protecting the 600kVA oil immersed transformer during transit requires meticulous protocols to safeguard core/winding precision, oil quality, and structural integrity from shocks, vibration, and environmental exposure. Pre-packing checks include tank pressure/leak tests, terminal torque verification, oil dielectric/acidity sampling (>55kV/2.5mm, <30ppm water), and accessory functional validation. Units generally ship oil-filled under nitrogen positive pressure (0.02-0.05MPa) to block moisture/oxidation; in weight-constrained shipments, oil is partially drained into sealed drums with vacuum filling kits and compatible high-purity oil for field reprocessing per IEC standards.
Individual components are safeguarded separately: radiators are foam-padded and crated with vibration dampers, bushings in impact-resistant enclosures, and control elements sealed with desiccants. The main body mounts on sturdy ISPM-15 wooden crates or steel skids with custom bracing, lateral supports, and energy-absorbing materials rated for 4-5g forces common in logistics. Packaging features weatherproof layers, corrosion inhibitors, humidity/temperature indicators, and shock/tilt recorders for transit monitoring.
Ocean export—typical for international deliveries—employs flat-rack/open-top containers with IMO lashing, salt-fog barriers, and protective covers; road/rail uses low-bed trailers with balanced cradles and designated lift points. Full documentation includes invoices, packing lists, origin/conformity certificates, routine test reports, dimensional/lifting drawings, oil SDS, handling/installation guides, and HS codes (8504.21 for ≤650kVA distribution transformers).
We handle end-to-end logistics with FOB/CIF/door options, customs assistance, insurance, and enhanced services like third-party verifications, on-site crane unloading supervision, oil filtration/degassing, erection support, and commissioning. This comprehensive strategy prevents damage, maintains as-new condition, meets global regulations, and ensures prompt, secure delivery for distribution, commercial, and industrial clients worldwide.
Individual components are safeguarded separately: radiators are foam-padded and crated with vibration dampers, bushings in impact-resistant enclosures, and control elements sealed with desiccants. The main body mounts on sturdy ISPM-15 wooden crates or steel skids with custom bracing, lateral supports, and energy-absorbing materials rated for 4-5g forces common in logistics. Packaging features weatherproof layers, corrosion inhibitors, humidity/temperature indicators, and shock/tilt recorders for transit monitoring.
Ocean export—typical for international deliveries—employs flat-rack/open-top containers with IMO lashing, salt-fog barriers, and protective covers; road/rail uses low-bed trailers with balanced cradles and designated lift points. Full documentation includes invoices, packing lists, origin/conformity certificates, routine test reports, dimensional/lifting drawings, oil SDS, handling/installation guides, and HS codes (8504.21 for ≤650kVA distribution transformers).
We handle end-to-end logistics with FOB/CIF/door options, customs assistance, insurance, and enhanced services like third-party verifications, on-site crane unloading supervision, oil filtration/degassing, erection support, and commissioning. This comprehensive strategy prevents damage, maintains as-new condition, meets global regulations, and ensures prompt, secure delivery for distribution, commercial, and industrial clients worldwide.
32
32 years of industry experience
Manufacturer Test
600kVA Oil Immersed Transformer
Progress Test
NPC ELECTRIC's 600kVA oil-immersed transformers insulating oil progress assesses breakdown voltage moisture acidity and purity per IEC 60296 with filtration to low contaminant levels. Core-coil drying progress tracks vacuum oven parameters and dew point below -45°C for superior insulation. Tank filling progress supervises vacuum impregnation degassing nitrogen blanketing and pressure decay leak tests. Accessory progress verifies temperature gauge calibration pressure relief operation gas relay functionality and tap changer sequencing. Pre-dispatch progress encompasses dimensional weight visual inspection labeling packaging checks shock tests and traceable photo/digital logs ensuring full compliance and dispatch readiness.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Leak Test
♦ DC Insulation Resistance Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
Load loss impedance voltage efficiency tests short secondary reduced voltage compute copper losses impedance (~4.5-6%) total losses at 75°C for regulation evaluation. Oil routine checks dielectric (>55kV/2.5mm) water (<30ppm) acidity DGA baseline. Temperature rise indicators verify accuracy alarms. Functional tests include relief valve activation gas relay tripping, tap changer operation sound level (<58dB). Mechanical validation covers tank overpressure leak-free bushing coordination wiring. Comprehensive FAT reports calibration certificates optional witnessing confirm IEC 60076 compliance routine tests before shipment.
Routine Test - Polarity 1-Ph
Purpose of Testing
The purpose of testing the polarity of a single-phase transformer is to ensure that the primary and secondary windings are correctly oriented, preventing issues like improper phase connection. It also verifies that the transformer operates safely and efficiently in the intended electrical system.
Testing Equipment
Test equipment: Polarity Tester (e.g. Megger, Hioki, etc.)
Voltage source: usually 500 V, 1000 V or customized as needed
Environmental monitoring: Temperature and humidity meter (records ambient temperature and humidity)
Voltage source: usually 500 V, 1000 V or customized as needed
Environmental monitoring: Temperature and humidity meter (records ambient temperature and humidity)
Pre-Test Preparation
Disconnect the device from the power supply and ensure that it is properly grounded and discharged.
Check the connection terminals and wiring to ensure that there is no looseness or contamination.
Test under suitable environmental conditions: relative humidity less than 75% and no rain (recommended temperature: 20-30°C).
Check the connection terminals and wiring to ensure that there is no looseness or contamination.
Test under suitable environmental conditions: relative humidity less than 75% and no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the bushing or terminal of the device under test and ensure proper grounding.
Apply Test Voltage:
Select the appropriate test voltage according to the rated voltage of the device. For single-phase systems, the applied voltage should comply with the equipment specifications (such as 220V or 380V, etc.).
Connect the test equipment to the bushing or terminal of the device under test and ensure proper grounding.
Apply Test Voltage:
Select the appropriate test voltage according to the rated voltage of the device. For single-phase systems, the applied voltage should comply with the equipment specifications (such as 220V or 380V, etc.).
Measure and Record
Start the test and record the following parameters:
Phase sequence: Confirm whether the phase sequence of the power supply is correct.
Polarity: Check whether the wiring meets the predetermined polarity (positive and negative terminals are connected correctly).
Voltage: The actual voltage value during the test.
Phase sequence: Confirm whether the phase sequence of the power supply is correct.
Polarity: Check whether the wiring meets the predetermined polarity (positive and negative terminals are connected correctly).
Voltage: The actual voltage value during the test.
Temperature Correction
Measure different wiring points (such as input and output) for comparative analysis to ensure that the electrical polarity is consistent.
Repeat Testing (if necessary)
If necessary, correct the measured parameters to the reference temperature (usually 20°C) to ensure the accuracy of the test results.
Evaluation Criteria (Reference)
Correct polarity: The wiring meets the expected polarity requirements and meets the standard. Reverse polarity: If reverse polarity occurs, it should be corrected immediately and retested. Polarity uncertainty: If there is any uncertainty, further check the power supply and wiring configuration.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
It is suitable for various combined scenarios such as power supply for commercial complexes, power supply for industrial park plants, power distribution for medium-sized residential communities, critical loads for hospitals and schools, photovoltaic power station access, agricultural processing centers, and office building substations, providing 600kVA high-efficiency low-voltage conversion and stable energy distribution.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
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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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