20 KV Class Three Phase Distribution Oil Immersed Transformer

Power Supply Capacity Advantages of 20 kV Class Three Phase Distribution Oil Immersed Transformer

Compared to 10 kV models, the 20 kV Class Three Phase Distribution Oil Immersed Transformer boosts power supply capacity by 50-80% under the same conductor cross-section. Its higher voltage grade reduces current density, lowering line loss in long-distance power transmission, making it ideal for large urban grids and industrial parks. This upgrade cuts power system construction costs by minimizing the need for additional transmission lines and substations, aligning with efficient grid development trends.

Low Energy Consumption Design of 20 kV Class Three Phase Distribution Oil Immersed Transformer

The transformer integrates a cold-rolled silicon steel wound core and precision-wound copper coils, reducing no-load loss by 35% and on-load loss by 25% compared to conventional 20 kV transformers. Its optimized magnetic circuit and low-resistance windings minimize energy waste during operation, helping end-users reduce electricity costs and meet global carbon reduction requirements. The low-loss performance has been verified by SGS tests, complying with IE2 energy efficiency standards.

Voltage Quality Guarantee of 20 kV Class Three Phase Distribution Oil Immersed Transformer

Equipped with a high-precision on-load tap changer (±2×2.5%), the transformer adjusts voltage dynamically to compensate for grid fluctuations, maintaining output voltage deviation within ±1%. This ensures stable power supply for sensitive industrial equipment (e.g., CNC machines, automation systems) and commercial facilities, avoiding downtime caused by voltage instability. The tap changer uses international brand components (optional ABB/Qualitrol) for long-term reliable operation.

Sealing and Insulation Technology of 20 kV Class Three Phase Distribution Oil Immersed Transformer

Targeting the higher insulation requirements of 20 kV voltage, the transformer uses multi-layer insulation paper (thickness ≥1.2mm) and vacuum pressure impregnation (VPI) technology, achieving insulation breakdown voltage ≥45kV. The tank adopts double-sealing (fluororubber gaskets + laser welding), ensuring 100% leak-free operation. Hermetically sealed models isolate oil from air, slowing insulation aging and extending service life to 25 years.

Harsh Environment Adaptability of 20 kV Class Three Phase Distribution Oil Immersed Transformer

The tank undergoes three-level anti-corrosion treatment (derusting → phosphating → electrostatic spraying) with a paint layer thickness of ≥100μm, resisting salt spray, humidity, and chemical corrosion. It operates stably in -30℃ to +45℃ ambient temperatures, with optional IP44 dust-proof protection for mining and construction sites. The robust structure withstands seismic intensity 8 and minor vibrations, adapting to complex installation conditions.

About ZISHENG ELECTRICAL

Zisheng are a professional 19+ years manufacturer in producing Oil-Immersed Transformers, Compact Substation, Pad Mounted Transformers, Pole Mounted Transformers and Dry Type Transformers. We own the certificates of ISO/CE/IEC 60076 and TUV Rheinland.
Transformers undergo rigorous FAT and type testing, support voltage/capacity customization. Welcome to consult for Catalog and Product. you can contact us at email info@bdzstransformer.com.

Case 1: State Grid Jiangsu Electric Power Co., Ltd.

Customer Profile: A leading provincial power utility in China, responsible for urban grid upgrading in Suzhou, serving 5 million residents and 10,000+ enterprises. Application Scenario: 20 kV urban distribution network expansion to replace aging 10 kV transformers and enhance power supply capacity. Solution: 50 units of 1600 kVA conservator-type transformers with high-precision tap changers and anti-corrosion treatment. Results: Power supply capacity increased by 60%, line loss reduced by 28%, annual energy savings of ~$420,000; zero voltage fluctuation complaints, meeting Suzhou’s smart grid construction standards.

Case 2: PT Pertamina (Indonesia)

Customer Profile: Indonesia’s national oil and gas company, operating a large petrochemical complex in Jakarta with high-demand industrial loads. Application Scenario: 20 kV power distribution for production lines, requiring stable power and explosion-proof compatibility. Solution: 20 units of 2000 kVA hermetically sealed transformers with enhanced insulation and flame-retardant transformer oil. Results: Operated continuously for 18 months without downtime, voltage stability ±0.8%, compliant with Indonesian National Standard (SNI) and petrochemical safety regulations; passed SABER certification for Southeast Asian market access.

Case 3: Dubai Electricity and Water Authority (DEWA)

Customer Profile: Dubai’s state-owned utility, responsible for power supply for the Expo 2020 legacy infrastructure and new residential districts. Application Scenario: 20 kV outdoor substations in high-temperature desert environments, requiring heat resistance and low maintenance. Solution: 35 units of 1000 kVA transformers with optimized heat dissipation (additional radiators) and salt spray-resistant coating. Results: Stable operation at 50℃ ambient temperature, maintenance frequency reduced by 70%, meeting DEWA’s “zero unplanned outage” requirement; supporting 30,000 new residential connections.

Case 4: Kenya Power and Lighting Company (KPLC)

Customer Profile: Kenya’s national power utility, upgrading rural and suburban power grids to support agricultural and small industrial development. Application Scenario: 20 kV long-distance power transmission for rural areas, requiring cost-effectiveness and durability. Solution: 40 units of 800 kVA conservator-type transformers with reinforced tank structure and dust-proof design. Results: Reduced rural grid construction costs by 35%, power supply coverage expanded to 50+ villages; withstood dusty and humid conditions, service life extended to 20+ years as verified by KPLC tests.

Rated Power (kVA)	Rated High Voltage (kV)	Rated Low Voltage (kV)	Connection Symbol	Short Circuit Impedance (%)	No Load Loss (W)	On-Load Loss (W)	No Load Current (%)	Cooling Mode	Tank Type
30	20/21	0.4	Dyn11/Yyn0	4.5	95	565	1.9	ONAN	Sealed/Conservator
50	20/21	0.4/0.6	Dyn11/Yyn0	4.5	120	840	1.8	ONAN	Sealed/Conservator
100	20/21	0.4	Dyn11/Yyn0	4.5	185	1475	1.5	ONAN	Sealed/Conservator
250	20/21	0.4	Dyn11/Yyn0	5.0	395	2965	1.0	ONAN	Sealed/Conservator
500	20/21	0.4	Dyn11/Yyn0	5.0	670	5465	1.0	ONAN	Sealed/Conservator
1000	20/21	0.4	Dyn11/Yyn0	5.0	1140	10250	0.6	ONAN	Sealed/Conservator
1600	20/21	0.4	Dyn11/Yyn0	5.5	1630	14460	0.6	ONAN/OFAF	Sealed/Conservator
2000	20/21	0.4	Dyn11/Yyn0	5.5	1930	16990	0.5	ONAN/OFAF	Sealed/Conservator
2500	20/21	0.4	Dyn11/Yyn0	6.0	2320	20215	0.5	ONAN/OFAF	Sealed/Conservator

Note: All parameters comply with IEC 60076-1/7 standards. Custom voltage grades (18kV/22kV) and technical parameters are available for specific grid requirements.

It fully meets IEC, IEEE, and ANSI standards, holding CE (LVD/EMC), SGS, RoHS, and ISO 9001 certifications. Regional certifications (SABER for Middle East, UL/CSA for North America, UKCA for UK) can be applied for to ensure market access.

Standard models in stock: 20-25 working days; customized orders (e.g., special voltage, enhanced heat dissipation): 30-40 working days. Expedited delivery (15 days) is available for urgent projects with a 15% surcharge.

Yes. We can adjust short-circuit impedance, tap changer range, and voltage levels to match your local grid standards. For extreme environments (high temperature, salt spray, dust), we offer customized anti-corrosion, heat dissipation, and protection grade (IP44/IP54) upgrades.

Compared to 10 kV transformers, it has 50-80% higher power supply capacity, 20-30% lower line loss in long-distance transmission, and better voltage stability for large-scale power supply. It is more suitable for urban grid expansion, industrial parks, and large infrastructure projects.

We have technical teams stationed in Southeast Asia, the Middle East, and Africa, offering on-site installation guidance, commissioning, and maintenance. All products come with a 12-month warranty, and we provide lifelong technical support and spare parts supply via global logistics networks.

Routine maintenance is simple: monthly check oil level (conservator type) and operating temperature; quarterly inspect sealing joints for leaks; annually clean radiators (more frequently in dusty areas); hermetically sealed models require no oil replacement under normal operation for 20+ years.

Yes. It is optimized for renewable energy grid integration, with enhanced voltage regulation to handle fluctuations from solar/wind power. We can customize short-circuit impedance and insulation levels to match your renewable energy system’s technical requirements.

With high-quality raw materials, advanced production technology, and strict quality control, the designed service life is 25 years. Under normal operation and regular maintenance, the actual service life can extend to 30 years.