Global Buying Guide for 220kV Oil-immersed Substation Power Transformers
I. Introduction to 220kV Oil-immersed Substation Power Transformers
A 220kV Oil-immersed Substation Power Transformer is designed for high-voltage power systems with a rated voltage of 220kV. It is widely used in power transmission networks, regional substations, renewable energy integration, and large industrial power supply systems.
These transformers are manufactured in accordance with IEC 60076 and GB 1094 standards. The typical capacity range is 50000kVA to 300000kVA, making them suitable for large-scale transmission and high-capacity substation applications.
220kV substation power transformers are commonly installed in environments where stable high-voltage power supply is required, such as:
-mining operations
-petrochemical and industrial parks
-offshore wind farms
-urban and regional substations
With reliable insulation structures and stable cooling systems, these transformers ensure safe and long-term operation in demanding environments.
II. 220kV Oil-immersed Substation Power Transformer Standards & Certification
1. Standards Supported
GB, IEC, GOST, EN, NF, ANSI/IEEE
(customized according to project requirements)
2. Certifications
ISO, CE, IEC, SABS, COC, CSA, UL
3. Energy Efficiency
The operating efficiency of a 220kV transformer can exceed 98%, complying with energy-efficiency regulations in many countries.
4. Proven Project Experience
Our 220kV transformers have been applied in numerous global projects including grid upgrades, renewable energy integration, and photovoltaic booster stations. Long-term performance under complex operating conditions has been fully verified, with a design life exceeding 30 years.
5. Environmental Sustainability
Environmentally friendly insulating oils such as FR3 natural ester oil and recyclable materials are used to reduce environmental impact and support global carbon-reduction initiatives.
6. Production & Delivery Capacity
Standard delivery time: around 180 days
Fastest delivery: about 120 days
III. Types of 220kV Oil-immersed Substation Power Transformers
At HENGFENGYOU ELECTRIC, several structural types of 220kV substation power transformers are available to meet different grid requirements.
Although these transformers operate based on the same electromagnetic principle, their structures and applications vary.
Common types include:
220kV three-phase double-winding transformer
220kV three-phase three-winding transformer
220kV autotransformer
Each design is optimized for specific power system conditions, and our engineering team can recommend the most suitable configuration according to project requirements.
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IV. 220kV Oil-immersed Substation Power Transformer Technical Specifications
Capacity Range
50000kVA – 300000kVA
(dual-winding off-circuit tap changer type)
Voltage Combination
High-voltage side:
220kV / 230kV / 242kV ±8×1.25%
Low-voltage side:
10kV / 11kV / 13.8kV / 35kV / 66kV
Loss Index
No-load loss:
45kW (50000kVA) – 150kW (300000kVA)
Load loss:
200kW (50000kVA) – 950kW (300000kVA)
Short-circuit impedance
12% – 20%
(Customizable according to load characteristics)
V. 220kV Substation Power Transformer Shipment
Grow Your Business with HENGFENGYOU ELECTRIC
Our mission is to become a globally trusted manufacturer of electrical equipment. Over the years, our technology, manufacturing experience, and project expertise have supported customers in more than 50 countries.
Many of our clients maintain long-term partnerships with us because Hengfengyou is committed to delivering reliable electrical equipment, stable quality, and professional service.
VI. 220kV Substation Power Transformer FAQ
Q1: Where are 220kV substation transformers typically used?
220kV substation transformers are widely used in:
regional power grid substations
industrial park power distribution systems
renewable energy plants (wind farms and PV booster stations)
mining power supply systems
railway and rail transit power networks
They provide reliable high-voltage power conversion.
Q2: What is the no-load loss range of a 220kV oil-immersed substation power transformer?
Depending on the transformer capacity, the no-load loss generally ranges from 45kW to around 150kW. High-quality silicon steel cores can further reduce energy losses by 5%–15%.
Q3: Can a 220kV substation power transformer operate in extremely cold environments?
Yes. Many 220kV substation power transformers are designed to operate within a temperature range of −45℃ to +40℃. Special insulating oils and low-temperature structural designs ensure stable operation in cold regions.
Q4: How is the short-circuit impedance selected?
Typical short-circuit impedance values range from 12% to 20%, depending on grid requirements and system short-circuit capacity.
Q5: What voltage regulation methods are available?
220kV substation power transformers generally support two regulation methods:
Off-Circuit Tap Changer
±5% voltage adjustment (requires power outage)
On-Load Tap Changer (OLTC)
±8 × 1.25% dynamic adjustment suitable for power systems with voltage fluctuations.
Q6: How is transportation safety ensured?
During transportation:
transformers are fixed using steel wire ropes
the oil tank is filled with nitrogen protection gas (0.01–0.03MPa)
land transportation speed is limited to ≤ 50km/h
marine transport should avoid severe salt-spray environments
Q7: Does insulation oil need to be replaced regularly?
Fully sealed transformers typically support maintenance-free operation for up to 30 years. For conventional transformers, oil quality testing is recommended every 5 years.
Q8: Are 220kV transformers suitable for renewable energy projects?
Yes. They are commonly used in wind and photovoltaic power stations and can be equipped with OLTC systems and intelligent temperature monitoring to handle fluctuating generation loads.
Q9: What foundation requirements are needed for installation?
foundation load-bearing capacity ≥ 1.2 times equipment weight
level deviation ≤ 2mm/m
outdoor installations require firewalls and oil collection pits
Q10: Can transformers operate at high altitudes?
For installations above 3000 meters, customized designs are recommended. Capacity reduction and enhanced insulation are typically applied to ensure safe operation.
Q11: What is the noise level?
Typical no-load noise level is ≤68dB(A) (for a 100MVA transformer), meeting IEC 60076-10 standards. Optional soundproof enclosures can reduce noise to below 58dB(A).
Q12: What after-sales services are provided?
Warranty: 18 months after shipment or 12 months after commissioning
Technical support: remote monitoring, fault diagnosis, and on-site service (response time ≤ 72 hours)
