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220kv Three phase on-load voltage regulating transformer Featured Image

220kv Three phase on-load voltage regulating transformer

The 220kV three-phase oil-immersed on-load tap-changing power transformer has undergone a series of significant innovations in materials, processes, and structure.
It features compact size, light weight, high efficiency, low loss, low noise, and reliable operation. These attributes contribute to substantial reductions in power grid losses and operational costs, yielding notable economic benefits.
This transformer is well-suited for power plants, substations, and large industrial and mining enterprises.
This product complies with the following national and international standards:
• IEC 70076.1: “Power Transformers – Part 1: General Requirements”
• IEC 70076.2: “Power Transformers – Part 2: Temperature Rise”
• GB/T 6451 – 2023: “Power Transformers – Part 3: Insulation Levels, Insulation Tests, and External Clearances”
• IEC 70076.5: “Power Transformers – Part 5: Ability to Withstand Short Circuit”
• “Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers”


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  • 220kv Three phase on-load voltage regulating transformer

Product Detail

22OKV INTELLIGENT THREE-PHASE NO-LOAD VOLTAGE REGULATION POWER TRANSFORMER

Technical parameter

31500k VA-420000kVA three-phase double-winding unexcited voltage regulating power transformer

Rated capacity (kVA) Voltage combination and tap range Coupling group Label No load loss kW(9) Load loss kW(9) No-load current % Short circuit impedance %
High voltage(kV) Low voltage(kV)
31500 220±2×2.5%

242±2×2.5%

 6.3、6.6、10.5 Ynd11 28 128 0.56 12~14
40000 32 149 0.56
50000 39 179 0.52
63000 46 209 0.52
75000 10.5、13.8 53 237 0.48
90000 64 273 0.44
120000 75 338 0.44
150000 1.5、13.8、15.75、18、20 89 400 0.4
160000 93 420 0.39
180000 102 459 0.36
240000 128 538 0.33
300000 154 641 0.3
360000 15.75、18、20 173 735 0.3
370000 176 750 0.3
400000 187 795 0.28
420000 193 824 0.28

The no-load loss values in the above parameter table are the Chinese national standard type 18 parameter values. The company can customize them according to the actual needs of users.

Note 1 Transformers with rated capacity less than 31500k VA and transformers with other voltage combinations are also available on request.

Note 2. Transformers with low voltage of 35kV or 38.5kV can also be supplied according to the requirements.

Note 3. Tapless structure is preferred. If required by operation, tap can be set.

Note 4, when the transformer annual average load rate is between 45%-50%o, the loss value in the table can be used to obtain the highest operating efficiency.

31500kVA-300000kVA three-phase three-winding

Rated capacity (kVA) Voltage combination and tap range Coupling group Label No load loss kW(9) Load loss kW(9) No-load current % Short circuit impedance %
High voltage(kV) Medium voltage(kV) Low voltage(kV) Open pressure K Depressurize
31500 220±2×2.5%
230±2×2.5%
242±2×2.5%		 69、115、121 6.3、6.6、10.5、21、36、37、38.5 Ynynd11 32 153 0.56 High-medium
22~24
High-low
12~14
Medium-low
7~9		 High-Medium
 12~14
High-low
 22~24
Medium-low
7~9
40000 38 183 0.5
50000 44 216 0.44
63000 52 257 0.44
90000 10.5、13.8、36、37、38.5 68 333 0.39
120000 84 410 0.39
150000 100 487 0.33
180000 10.5、13.8、15.75、21、36、37、38.5 113 555 0.33
240000 140 684 0.28
300000 166 807 0.24

Note 1 The capacity allocation for load losses in the table is (100/100/100)%. The capacity allocation of the booster structure can be (100/50/100)%, and the capacity allocation of the step-down structure can be(100/50/100)%or (100/50/100)%.

Note 2, Transformers with rated capacity less than 31500kVA and transformers with other voltage combinations can also be provided according to requirements.

Note 3, transformers with low voltage of 35kV can also be provided according to the requirements.

Note 4. The tapless structure is preferred. If required by operation, tap can be set.

Note 5, when the transformer annual average load rate is about 45%, the loss value in the table can be used to obtain the highest operating efficiency.

31500k VA-240000kVA low-voltage 66kV three-phase double-winding unexcited voltage regulating power transformer

Rated capacity (kVA) Voltage combination and tap range Coupling group Label No load loss kW(9) Load loss kW(9) No-load current % Short circuit impedance %
High voltage(kV) Low voltage(kV)
31500 220±2×2.5%
230±2×2.5%		 63
66
69		 Ynd11 30 143 0.71 12~14
40000 36 167 0.71
50000 42 200 0.65
63000 50 234 0.65
90000 66 306 0.6
120000 81 367 0.6
150000 97 430 0.54
150000 97 430 0.54
180000 110 487 0.54
240000 136 603 0.48

Note 1. Tapless construction is preferred. If required by operation, tap can be set.

Note 2, when the transformer annual average load rate is between 45%-50%, the loss value in the table can be used to obtain the highest operating efficiency.

31500k VA-240000k VA three-phase three-winding unexcited voltage regulating autotransformer

Rated capacity (kVA) Voltage combination and tap range Coupling group Label No load loss kW(9) Load loss kW(9) No-load current %
High voltage(kV) Medium voltage(kV) Low voltage(kV)
31500 220±2×2.5%
230±2×2.5%
242±2×2.5%		 115、121 6.6、10.5、21、36、37、38.5 YNa0d11 16 105 0.36
40000 18 129 0.36
50000 22 153 0.32
63000 26 181 0.32
90000 32 249 0.27
120000 10.5、13.8、15.75、18、21、36、37、38.5 39 307 0.27
150000 46 365 0.22
180000 54 417 0.22
240000 63 518 0.21
No load loss kW(9) Load loss kW(9) No-load current % Short circuit impedance %
step-up voltage step-down voltage
16 89 0.32 High-medium
12~14
High-low
 8~12
Medium-low
 14~18		 High-Medium
 8~10
High-low
 28~34
Medium-low
 18~24
16 108 0.32
19 129 0.27
22 154 0.27
29 211 0.22
35 259 0.22
42 308 0.21
48 349 0.21
57 454 0.16

The no-1oad loss values in the above parameter table are the Chinese national standard type 18 parameter values. The company can customize them according to the actual needs of users.

Note 1. The capacity allocation of the booster structure is (100/50/100)%. The capacity allocation of the step-down structure is (100/100/50)%.

Note 2, the value of the short circuit impedance in the table is 100% of the rated capacity.

Note 3. Transformers with a low voltage of 35kVare also available upon request

Note 4. The tapless structure drawing is preferred. If required by operation, tap can be set.Note 5, when the transformer annual average load rate is about 40%, the loss value in the table can be used to obtain the highest operating efficiency.

31500kVA-240000kVA three-phase three-winding unexcited voltage regulating autotransformer

Rated capacity (kVA) Voltage combination and tap range Boost combination Buck combo Short circuit impedance %
High voltage(kV) Medium voltage(kV) Low voltage(kV) Coupling group Label No load loss (kW) Load loss (kW) No-load current % No load loss (kW)  Load loss (kW) No-load current % Open pressure Depressurize
31500 220±2×2.5%
230±2×2.5%
242±2×2.5%		 115、121 6.6、10.5、21、36、37、38.5 Yna0d11 16 105 0.36 14 89 0.32 High-medium
12~14
High-low
8~12
Medium-low
 14~18		 High-Medium
 8~9
High-low
 28~34
Medium-low
 18~24
40000 18 129 0.36 16 108 0.32
50000 22 153 0.32 19 129 0.27
63000 26 181 0.32 22 154 0.27
90000 10.5、13.8、15.75、18、21、36、37、38.5 32 249 0.27 29 211 0.22
120000 39 307 0.27 35 259 0.22
150000 46 365 0.22 42 308 0.21
180000 54 417 0.22 48 349 0.21
240000 63 518 0.21 57 454 0.16

Note 1 Transformers with a low voltage of 35kV are also available upon request.

Note 2. When the average annual load ratio of the transformer is about 50%, the loss value in the table can be used to obtain the highest operating efficiency.

Three-phase two-winding on-load voltage regulating power transformer with a voltage class of 220 kV and a capacity range from 31500 kVA to 240000 kVA.

Rated capacity (kVA) Voltage combination and tap range Coupling group Label Boost combination  Short-Circuit Impedance (%)
High voltage(kV) Medium voltage(kV) Low voltage(kV)  No load loss (kW) Load loss (kW) No-load current %
31500 220、230 ±4×1.25
±6×1.25
±8×1.25		 6.3、6.6、10.5、21、36、37、38.5 Ynd11 24 122 0.46 12~14
40000 29 142 0.46
50000 34 170 0.42
63000 40 199 0.42
90000 10.5、21、36、37、38.5 51 259 0.36
120000 63 321 0.36
150000 74 380 0.33
180000 86 436 0.3
120000 66、69 65 320 0.36
150000 77 374 0.33
180000 90 428 0.3
240000 112 532 0.24
According to user requirements, a transformer with a low voltage of 35 kV can be selected.
Under the condition of meeting the operating requirements,the fewer the tap stages, the better.

Three-phase three-winding on-load voltage regulating power transformer with a voltage class of220 kV and a capacity range from 31500 kVAto240000 kVA.

Rated capacity (kVA) Voltage combination and tap range Coupling group Label Boost combination Short-Circuit Impedance (%)
H V (kV) High voltage Tap Range(%) M V (kV) L V (kV) No load loss (kW)  Load loss (kW) No-load current %
31500 220、230 ±4×1.25
±6×1.25
±8×1.25		 69、115、121 6.3、6.6、10.5、21、36、37、38.5 Ynynd11 28 145 0.5 High-Medium 12~14

High-Low 22~24

Medium-Low

7~9
40000 33 174 0.48
50000 38 205 0.48
63000 45 244 0.44
90000 10.5、21、36、37、38.5 58 316 0.35
120000 74 390 0.35
150000 86 463 0.31
180000 99 568 0.31
240000 123 704 0.28

Three-phase three-winding on-load voltage regulating autotransformer with a voltage class of220 kV and a capacity range from 31500 kVAto 240000 kVA.

Rated capacity (kVA) Voltage combination and tap range Coupling group Label Boost combination Short-Circuit Impedance (%)
H V (kV) High voltage Tap Range(%) M V (kV) L V (kV)  No load loss (kW) Load loss (kW)  No-load current %
31500 220、230 ±4×1.25
±6×1.25
±8×1.25		 115、121 6.3、6.6、10.5、21、36、37、38.5 YNa0d11 16 97 0.35 High-Medium
 8~11
High-Low
 28~34
Medium-Low
 18~24
40000 19 119 0.35
50000 22 142 0.31
63000 26 170 0.31
90000 10.5、21、36、37、38.5 32 222 0.26
120000 41 277 0.26
150000 48 329 0.22
180000 54 378 0.22
240000 66 487 0.19
The listed data is applicable to step-down structure products with a capacity distribution of (100/100/50)%.
According to user requirements, a transformer with a low voltage of 35 kV can be selected.
Under the condition of meeting the operating conditions,the fewer the tap stages,the better.

Structural features

220kVclass three-phase double-winding on-load voltage regulating power transformer According to the special requirements

220kv Three phase on-load voltage regulating transformer

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