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Power Transformer

220kv Oil-immersed Power Transformer

  • Brand: HENGFENGYOU
  • Series: SSZ
  • USES: Power Transformer
  • Country of origin: China
  • Terms of payment: L/C, T/T, Western Union, Paypal, Money Gram
  • Certification: ISO9001、CB
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220kv Power Transformer Overview

220kV transformer is a high-voltage oil immersed transformer with a core structure. According to the number of phases, it can be divided into single-phase transformer and three-phase transformer; According to the voltage regulation mode, it can be divided into on load voltage regulation and non excitation voltage regulation; According to the winding coupling mode, it can be divided into power transformer and autotransformer; According to the number of windings, it can be divided into double winding, three winding, three winding + balance winding. At the same time, it includes special types of 220kV transformers such as split transformers and combined transformers. The product is designed according to IEC international standards, IEEE standards and current national standards

220kv power transformer manufacturer
Sudan -180MVA-220KV main transformer for power grid


220kv Power Transformer Advantage

1. Low noise, reducing noise pollution to the environment;
2. Low partial discharge to ensure stable and reliable operation of transformer;
3. Low temperature rise, strong overload capacity;
4. Low loss, energy structure optimization;
5. No leakage, high transformer sealing performance;
6. Maintenance free, reduce the maintenance cost of customers;
7. High impedance, high short-circuit resistance, providing the safety performance of the transformer;
8. Adopt intelligent components and intelligent power station design technology;

220kv Power Transformer Type
For HENGFENGYOU ELECTRIC, a 220kV transformer can be a three-phase double winding transformer, a three-phase three winding transformer, or an autotransformer transformer. These types of transformers have the same principle, but their structures are different, and different types of transformers have different applications. HENGFENGYOU ELECTRIC provides you with the most ideal solution.
220kV three-phase double winding transformer
220kV three-phase three winding transformer
220kV autotransformer transformer

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220kv Power Transformer Technical Parameter
220kV double winding non excitation voltage regulating power transformer
额定容量
Rated capacity
(kva)		 电压组合及分接范围
Voltage ratio and tap range
(kv)		 联结组
Connection symbol		 空载损耗
No-load loss
(kw)		 负载损耗
Full-load loss
(kw)		 短路抗阻
Impedance(%)		 空载电流
No-load current
(%)
高压
HV		 低压
LV
31500 220
242±2×2.5%		 6.3
6.6
10.5
11		 YNd11 35 135 12-14 0.70 
40000 41 157 0.70 
50000 49 189 0.65 
63000 58 220 0.65 
75000 10.5
11
13.8		 67 250 0.60 
90000 77 288 0.55 
120000 94 345 0.55 
150000 11;13.8;
15.75;20		 112 405 0.50 
180000 128 459 0.46 
240000 160 567 0.42 
300000 15.75;
18;20		 189 675 0.38 
360000 217 774 0.38 



Low voltage 66kV level 220kV double winding non excitation voltage regulating power transformer
额定容量
Rated capacity
(kva)		 电压组合及分接范围
Voltage ratio and tap range
(kv)		 联结组
Connection symbol		 空载损耗
No-load loss
(kw)		 负载损耗
Full-load loss
(kw)		 短路抗阻
Impedance(%)		 空载电流
No-load current
(%)
高压
HV		 低压
LV
31500 220
242±2×2.5%		 63
66
69		 YNd11 38 151 12-14 0.89 
40000 45 176 0.89 
50000 53 211 0.82 
63000 63 247 0.82 
90000 83 323 0.75 
120000 102 387 0.75 
150000 122 453 0.68 
180000 138 513 0.68 
240000 171 635 0.61 




220kV dual winding on load voltage regulating power transformer
额定容量
Rated capacity
(kva)		 电压组合及分接范围
Voltage ratio and tap range
(kv)		 联结组
Connection symbol		 空载损耗
No-load loss
(kw)		 负载损耗
Full-load loss
(kw)		 短路抗阻
Impedance(%)		 空载电流
No-load current
(%)
高压
HV		 低压
LV
31500 220
242±2×2.5%		 66.3;6.6
10.5;11
35;37;38.5		 YNd11 38 135 12-14 0.70 
40000 45 157 0.63 
50000 54 189 0.56 
63000 63 220 0.56 
90000 10.5;11
35;37;38.5		 80 288 0.49 
120000 99 346 0.49 
150000 116 405 0.42 
180000 135 468 0.42 
120000 66
69		 102 355 0.49 
150000 120 415 0.42 
180000 140 475 0.42 



220kV Three winding Unexcited Voltage Regulating Power Transformer
额定容量
Rated capacity
(kva)		 电压组合及分接范围
Voltage ratio and tap range(kv)		 联结组
Connection symbol		 空载损耗
No-load loss
(kw)		 负载损耗
Full-load loss
(kw)		 短路抗阻
Impedance(%)		 空载电流
No-load current
(%)
高压
HV		 中压
MV		 低压
LV		 升压变
step-up		 降压变
step-down
31500 220
242±2×2.5%		 69
115
121		 6.3
6.6 10.5
11
35 37
38.5		 YNyn0d11 40 162 高-中
H-M
22-24
高-低
H-L
12-14
中-低
M-L
7-9		 高-中
H-M
22-24
高-低
H-L
12-14
中-低
M-L
7-9		 0.70 
40000 48 189 0.63 
50000 56 225 0.56 
63000 66 261 0.56 
90000 10.5 11
13.8 35
37 38.5		 86 351 0.49 
120000 106 432 0.49 
150000 11 13.8
15.75
35 37
38.5		 125 513 0.42 
180000 142 585 0.42 
240000 176 720 0.35 
300000 208 750 0.30 




220kV three winding non excitation voltage regulating autotransformer
额定容量
Rated capacity
(kva)		 电压组合及分接范围
Voltage ratio and tap range(kv)		 联结组
Connection symbol		 空载损耗
No-load loss(kw)		 负载损耗
Full-load loss(kw)		 短路抗阻
Impedance(%)		 空载电流
No-load current
(%)
高压
HV		 中压
MV		 低压
LV		 升压
step-up		 降压
step-down		 升压
step-up		 降压
step-down		 升压变
step-up		 降压变
step-down
31500 220
242±2×2.5%		 115
121		 6.6 10.5
11
35 37
38.5		 YNyn0d11 25 22 117 99 高-中
H-M
12-14
高-低
H-L
8-12
中-低
M-L
14-18		 高-中
H-M
8-12
高-低
H-L
28-34
中-低
M-L
18-24		 0.50 
40000 29 26 144 121 0.50 
50000 34 30 170 144 0.43 
63000 40 36 201 171 0.43 
90000 50 46 276 234 0.36 
120000 10.5
11 13.8 15.75
18 35 37
38.5		 62 56 340 288 0.36 
150000 70 60 405 342 0.33 
180000 80 72 464 387 0.33 
240000 95 86 595 504 0.25 




220kV three winding on load voltage regulating power transformer
额定容量
Rated capacity
(kva)		 电压组合及分接范围
Voltage ratio and tap range(kv)		 联结组
Connection symbol		 空载损耗
No-load loss
(kw)		 负载损耗
Full-load loss
(kw)		 短路抗阻
Impedance(%)		 空载电流
No-load current
(%)
高压
HV		 中压
MV		 低压
LV
31500 220
242±2×2.5%		 69
115
121		 6.3
6.6 10.5
11
35 37
38.5		 YNyn0d11 44 162 高-中
H-M
22-24
高-低
H-L
12-14
中-低
M-L
7-9		 0.77 
40000 50 189 0.70 
50000 60 225 0.63 
63000 70 261 0.63 
90000 10.5 11
35
37 38.5		 92 351 0.56 
120000 115 432 0.56 
150000 135 513 0.49 
180000 159 630 0.49 
240000 193 780 0.45 


220kv Power Transformer Shipment


 

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220kv Power Transformer FAQ

What is a 220kV power main transformer?
The 220kV main transformer is a high-voltage equipment with a rated voltage of 220kV, used for boosting or reducing voltage in the power grid, with a capacity typically ranging from 100-500MVA. Its core structure includes high-voltage windings, iron cores, cooling systems, and insulating oil, supporting on load voltage regulation (such as ± 8 × 1.25% regulation range) or non excited voltage regulation (± 2 × 2.5%), suitable for power plants, hub substations, and large industrial areas.
 
What are the main application scenarios?
*Power plant export: Step up the output voltage of the generator (such as 24kV) to 220kV for long-distance transmission of 10.
*Transmission network nodes: achieve multi-level voltage conversion (such as 220kV/110kV/35kV) to supply power to urban distribution or industrial areas.
*New energy grid connection: such as the collection and boosting of wind farms and photovoltaic power stations
 
What is the capacity range of a 220kV transformer?
*Conventional capacity: 25-240MVA (regional transmission).
*Large capacity customization: 240-400MVA (such as grid connection of offshore wind power clusters or ultra-high voltage matching).
 
What are the differences in the applicable scenarios between the three windings of 220kV power transformers and autotransformers?
Type three winding transformer autotransformer
Structure independent high voltage, medium voltage, and low voltage windings. High voltage and medium voltage share some windings, with small volume and high efficiency
Applicable scenarios for multi voltage interconnection (such as 220/35/10kV) and similar voltage conversion (such as 220kV/66kV)
The cost and efficiency are relatively high, but voltage isolation is safer, with lower costs and less losses, making it suitable for large capacity transmission
How to choose the cooling method for 220kV power transformers?
*OFAF (forced oil circulation air cooling): High economy and easy maintenance.
*ODAF (Guided Oil Circulation Air Cooling): Accurate heat dissipation, suitable for high load scenarios.
*OFWF (forced oil circulation water cooling): requires a matching water cooling system, suitable for high temperature or enclosed substations.
 
6. Selection suggestions for 220kV power transformer tap changer (MR, ABB, domestic)
Brand advantages applicable scenarios
MR (Germany) is a leading technology in the field of ultra-high voltage, with a mechanical lifespan of over 1.2 million times in cross-border power grids and high reliability demand scenarios
ABB (Switzerland) integrates digital control to support remote diagnosis and predictive maintenance of smart substations or projects requiring automation integration
Huaming (China) offers high cost-effectiveness and fast localized service response (72 hours on-site) for regular regional power grids or projects with limited budgets
7. Delivery cycle and key influencing factors of 220kV power transformers?
*Standard cycle: 4 months (including design, material procurement, production, and testing).
*Urgent delivery: can be compressed to 2 months (requires urgent fee and depends on factory scheduling).
*Delay factors:
*Delayed supply of imported components such as bushings and tap changers.
*Complex tests (lightning impulse, temperature rise, partial discharge testing).
 
8. Design life and measures to extend the life of 220kV power transformers
*Design lifespan: 35 years (IEC 60076 standard).
*Methods for extending lifespan:
*Control the load rate within 85% to avoid long-term overload.
*Regular oil chromatography analysis (DGA) is used to monitor internal faults.
*Real time monitoring of hotspot temperature using fiber optic temperature measurement technology.
 
What content does the warranty clause for 220kV power transformers cover?
*Warranty period: Usually 2 years, Hengfengyou can extend it to 5 years.
*Coverage Area:
*Manufacturing defects (winding deformation, multi-point grounding of iron core).
*Mechanical failure of tap changer and failure of bushing sealing.
*Excluding: lightning strikes, overvoltage during operation, and improper human maintenance.
 
10. Key considerations in the operation and maintenance of 220kV power transformers
*Daily inspection: Check the oil level, oil temperature, and operating status of the cooling system once a month.
*Annual testing: insulation oil withstand voltage test, micro water content analysis.
*Periodic overhaul: Conduct winding deformation testing and core insulation testing every 5 years.
 

 
  



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