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110 KV Power Main Transformer

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110 KV Power Main Transformer

110kV Power Transformer Solution

I. 110kV Power Transformer Selection Scheme

The 110kV three-phase oil-immersed power transformer is a core high-voltage equipment for regional power grids, industrial power supply, new energy grid connection, and power plant step-up applications. It is used for voltage conversion and efficient power distribution, with a maximum capacity of 200MVA. It has been operating reliably in more than 50 countries and regions worldwide. With 30 years of professional manufacturing experience, Hengfengyou Electric provides a complete 110kV transformer selection solution that meets global mainstream standards, high efficiency, long service life, and strong environmental adaptability.

1. Structure Type & Cooling Mode

  • Mainstream Type: Three-phase two-winding / three-winding oil-immersed power transformer
  • Capacity Range: 20MVA – 200MVA
  • Cooling: ONAN, ONAF, OFAF, ODAF available
  • Applications: Grid substations, industrial plants, new energy stations, urban substations, power plant step-up stations

2. Standards, Certifications & Energy Efficiency

  • Standards: GB, IEC60076, GOST, EN, NF, ANSI/IEEE (customizable to client standards)
  • Certifications: ISO, CE, IEC, SABS, COC, CSA, UL
  • Efficiency: Efficiency >99%, compliant with EU 2015/2014/548/EC Ecodesign Tier 2
  • Loss: Low no-load and load loss for long-term energy saving

3. Winding Structure Selection (Two-Winding vs Three-Winding)

  • Two-Winding Transformer
  • Three-Winding Transformer

4. Technical sheet for 110kv Power transformer

110kV  class,S(F)10,S(F)11-series  three-phase  double-winding  power  transformer


Rated
power
(KVA)
High
Voltage
(KV)
H.V.Tap
range
 Low
Voltage
 (kV)
Connection
symbol
Short-
Circuit
Impedance
(%)
No-Load
Loss
(W)
On-Load
Loss
(W)
No-Load
Current
(%)
9型
损耗		10型
损耗		11型
损耗		9型
损耗		10型
损耗		11型
损耗
6300 110
121
(132)		±2×2.5%  6.3
 6.6
 10.5
  11
 (20)
(34.5)		YNd1110.5 9.5 8.5 7.5 36.9 34.9 34.9 0.69
8000 11.4 10.2 9 45 42.5 42.5 0.69
10000 13.3 11.9 10.5 53.1 51.2 51.2 0.64
12500 15.7 14.1 12.4 63 59.5 59.5 0.64
16000 19 17 15 77.4 73.1 73.1 0.59
20000 22.6 20.2 17.8 93.6 88.4 88.4 0.59
25000 26.6 23.8 21 110.7 10.5 10.5 0.54
31500 31.7 28.4 25 133.2 126 126 0.54
40000 37.8 33.9 29.9 156.6 148 148 0.56
50000 44.7 40 35.3 189 184 184 0.52
63000 53.1 47.5 41.9 234 221 221 0.48
75000 12~1459 53.1 47.2 278 264.1 264.1 0.38
90000 68 61.2 54.4 320 304 304 0.34
120000 84.8 76.4 67.9 397 377.2 377.2 0.31
150000 100.2 90.2 80.2 472 448.5 448.5 0.27
180000 112.5 101.3 90 532 505.4 505.4 0.23


110kV class,S(F)Z10,S(F)Z11-series three-phase double-winding power transformer load tap main technical parameters


Rated
power
(KVA)
High
Voltage
(kV)
H.V.Tap
range
Low
Voltage
(kV)
Connection
symbol
Short-
Circuit
Impedance
(%)
No-Load
Loss
(W)
On-Load
Loss
(W)
No-Load
Current
(%)
9型
损耗		10型
损耗		11型
损耗		9型
损耗		10型
损耗		11型
损耗
6300 110
121
(132)		±8×1.25%
(±9×
1.67%)		6.3
6.6
10.5
11
(20)
(34.5)		YNd1110.5 10.4 9.3 8.2 37 34.9 34.9 0.69
8000 12.4 11.1 9.8 45 42.5 42.5 0.69
10000 14.9 13.4 11.8 53 51.2 51.2 0.82
12500 17.3 15.5 13.7 63 59.5 59.5 0.82
16000 20.9 18.7 16.5 77 73.1 73.1 0.76
20000 24.7 22.1 19.5 93 88.4 88.4 0.76
25000 28.8 25.8 22.7 110 10.5 10.5 0.69
31500 34831.1 27.4 133 126 126 0.69
40000 41.7 37.3 32.9 156 148 148 0.63
50000 49.4 44.1 38.9 194 184 184 0.63
63000 58.7 52.5 46.4 234 221 221 0.57

110kV class,S(F)S10,S(F)S11-series of three-phase three-winding power transformer without excitation regulator main technical parameters


Rated
power
(kVA)
High
Voltage
(kV)
H.V.Tap
range
Middle
Voltage
(kV)
 Low
Voltage
 (kV)
Connection
symbol
 Short-Circuit
Impedance
    (%)
No-Load
Loss
(W)
On-Load
Loss
(W)
No-Load
Current
(%)
step upstep down9型
损耗		10型
损耗		11型
损耗		9型
损耗		10型
损耗		11型
损耗
6300 110
121		±2×2.5%35
37
38.5		6.3
6.6
10.5
11		YNyn0d11高-中   高-中

17~18    10.5


高-低  高-低

10.5    17~18


中-低   中-低

 6.5     6.5		11.4 10.2 9 47.7 45.1 45.1 0.7
8000 13.7 12.3 10.8 56.7 53.6 53.6 0.67
10000 16.2 14.5 12.8 66.6 62.9 62.9 0.63
12500 19 17 15 78.3 74 74 0.6
16000 22.9 20.5 20.5 95.4 90.1 90.1 0.56
20000 27.1 24.3 21.4 112.5 106.3 106.3 0.53
25000 32.1 28.7 25.3 133.2 125.8 125.8 0.49
31500 38 34 30 157.5 148.8 148.8 0.46
40000 45.4 40.7 35.9 189 178.5 178.5 0.39
50000 53.7 48.1 42.4 225 212.5 212.5 0.35
63000 63.7 57 50.3 270 255 255 0.35

110kV  class,S(F)SZ10,S(F)SZ11-series  of three-phase  three-winding  power  transformer  load  tap  main  technical  parameters


Rated
power
(KVA)
High
Voltage
(kV)
H.V.Tap
range
Middle
Voltage
(kV)
Low
Voltage
 (kV)
Connection
symbol
Short-
Circuit
Impedance
(%)
No-Load
Loss
(W)
On-Load
Loss
(W)
No-Load
Current
(%)
9型
损耗		10型
损耗		11型
损耗		9型
损耗		10型
损耗		11型
损耗
6300 110
121		±2×2.5%35
37
38.5		6.3
6.6
10.5
11		YNynOd11高-中

10.5


高-低
17~18


中-低

6.5		12.4 11.1 9.75 47.7 45.1 45.1 0.84
8000 14.9 13.4 11.8 56.7 53.6 53.6 0.84
10000 17.6 15.8 13.9 66.6 62.9 62.9 0.79
12500 20.2 18.1 16 78.3 74 74 0.79
16000 25 22.4 19.8 95.4 90.1 90.1 0.74
20000 29.6 26.5 23.4 112.5 106.3 106.3 0.74
25000 34.9 31.2 27.5 133.2 125.8 125.8 0.69
31500 41.6 37.2 32.8 157.5 148.8 148.8 0.69
40000 49.7 44.5 39.2 189 178.5 178.5 0.64
50000 48.5 52.6 16.5 225 212.5 212.5 0.64
63000 69.9 62.6 55.2 270 255 255 0.59

5. On-Load Tap Changer (OLTC) Selection

  • MR (Germany): High reliability, mechanical life >100,000 operations, for high-end projects
  • ABB: Balanced performance, global service network, compatible with intelligent control
  • Huaming (China): Cost-effective, fast after-sales service, life ≈50,000 operations
  • Principle: Imported brands for harsh environments; domestic brands for cost-sensitive projects

6. Environmental Adaptability

  • Enhanced insulation and corrosion protection for high altitude, heavy pollution, salt fog, high temperature
  • Low noise, fireproof, enhanced heat dissipation for indoor/underground/urban substations
  • Adapted to fluctuating loads of PV and wind power plants

II. 110kV Transformer Design & Installation Scheme

1. Layout & Connection

  • Preferred GIS/HGIS switchgear for compact layout and high reliability
  • Connected by gas-oil bushing, GIB or power cable
  • Complies with N-1 security criterion, supports single/parallel operation

2. Key Installation Procedures

  1. Lifting & Placement: Accurate hoisting with qualified crane
  2. Accessory Installation: Radiator, bushing, conservator, cooling system, OLTC
  3. Vacuum Oil Filling & Hot Oil Circulation: Remove moisture and gas
  4. Standing & Venting: Stand ≥24 hours, repeated degassing
  5. Grounding: Neutral point, tank, arrester combined grounding; resistance ≤4Ω

3. Protection Configuration

  • Zinc oxide lightning arrester on HV side
  • CSP HV fuse / circuit breaker
  • Complete relay protection: differential, Buchholz, overcurrent, zero sequence, temperature, pressure

III. 110kV Transformer Commissioning & O&M Scheme

1. Pre-Commissioning Tests

  • Winding DC resistance, ratio, polarity, vector group test
  • Insulation resistance, applied voltage, induced withstand voltage test
  • Partial discharge test
  • Insulation oil test: breakdown voltage, moisture, DGA
  • No-load and load loss test to verify efficiency

2. System Commissioning

  • Protection testing: differential and backup protection integrated test
  • 5 times no-load impulse closing
  • On-load test to verify protection polarity
  • Cooling and OLTC linkage test

3. Intelligent O&M & Long Life Design

  • Design life >30 years, actual life up to 50 years with proper maintenance
  • Optional online monitoring: DGA, core grounding current, winding temperature, partial discharge
  • Remote monitoring, condition-based maintenance, intelligent alarm
  • Life extension: control winding hot-spot temperature ≤65℃, avoid long-term overload, regular DGA

4. Environmental Protection & Low Carbon

  • FR3 vegetable oil available, biodegradability >95%
  • Recyclable materials, low carbon footprint, in line with “dual carbon” goals

5. Delivery Time

  • Standard model: 90 days
  • Emergency order: 50 days fastest
  • Custom model: 4–6 months

IV. Core Specification Summary

ItemCore ContentRecommended Scheme/Standard
Type110kV three-phase oil-immersed power transformerTwo/three winding, 20MVA–200MVA
StandardsGlobal universal standardsGB/IEC/GOST/EN/NF/ANSI/IEEE
EfficiencyHigh efficiency, low loss>99%, EU Tier 2
LifeLong-life design>30 years
EcoGreen insulationFR3 vegetable oil, biodegradable >95%
CoolingMultiple cooling modesONAN/ONAF/OFAF
OLTCBrand optionsMR, ABB, Huaming
GroundingSafety grounding≤4Ω
DeliveryFast lead timeStandard 90d, fastest 50d

V.Summary

Hengfengyou 110kV power transformer features 30 years of manufacturing experience, global certifications, efficiency over 99%, service life over 30 years, and fast delivery. It is widely used in state grids, industrial and mining enterprises, new energy step-up stations, regional substations, and power plants. The products run reliably in more than 50 countries including Tanzania, Zimbabwe, Ghana, South Africa, Kenya, Zambia, Sudan, Libya, Congo, UAE, Saudi Arabia, Iraq, Syria, Bangladesh, etc.

We adhere to standardized design, modular manufacturing, intelligent O&M, and full life cycle service to provide customers with safe, reliable, energy-saving and environmentally friendly 110kV power transformation solutions.


VI. 110 KV Power Main Transformer FAQ

Q1: What is a 110kV main power transformer?

A: It is the core equipment of high-voltage grids, used to step down 110kV to 10kV/35kV or step up low voltage to 110kV. Capacity range: 20MVA–200MVA. Components: core, winding, tank, cooling system, protection devices.

Q2: What are the main applications of 110kV transformers?

  • Grid hubs: connecting transmission and distribution networks
  • Large industries: steel, chemical, mining
  • New energy: PV and wind farm step-up
  • Urban substations: reliable power for dense areas
  • Power plant step-up stations

Q3: Difference between two-winding and three-winding 110kV transformers?

  • Two-winding: 110kV + one low-voltage winding; simple, low cost
  • Three-winding: 110kV + two medium/low-voltage windings; multi-voltage supply, higher cost

Q4: How to choose OLTC brands: MR, ABB, Huaming?

  • MR: >100k operations, highest reliability, for high-end projects
  • ABB: balanced performance, global service
  • Huaming: cost-effective, fast service
  • Imported for harsh environments; domestic for cost-sensitive projects

Q5: What is the delivery time for 110kV transformers?

  • Standard: 90 days
  • Emergency: 50 days fastest
  • Custom (high impedance, special cooling): 4–6 months

Q6: What is the design life of 110kV transformers?

  • Design life: >30 years (IEC standard)
  • Actual life: up to 50 years
  • Key factors: load rate, maintenance, environment; control winding temp ≤65℃

Q7: What is the warranty term?

  • Warranty: 12–36 months after delivery (per contract)
  • Coverage: manufacturing defects
  • Consumables (OLTC, bushings): usually 1-year separate warranty
  • Exclusions: man-made damage, natural disasters, misuse

Q8: What after-sales service is provided?

  • Installation guidance, commissioning support, operation training
  • Periodic maintenance: oil test, preventive test, condition assessment
  • Emergency response: on-site within 72 hours
  • Upgrade: intelligent monitoring, capacity expansion, noise reduction

Q9: How to protect against lightning and short circuit?

  • Install zinc oxide arresters
  • Equip CSP fuses or circuit breakers
  • Reliable grounding system (≤4Ω)
  • Complete relay protection system

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