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Product Description

The 220KV power transformers belong to the high-voltage oil immersed transformer and adopts a core structure. According to the number of phases, it can be divided into single-phase transformers and three-phase transformers; According to the voltage regulation method, it can be divided into load regulation and excitation free regulation; According to the winding coupling method, it can be divided into power transformers and autotransformers; According to the number of windings, it can be divided into double windings, three windings, three windings+balanced windings. It also includes special types of 220kV transformers such as split transformers and combination transformers. This product is suitable for power plants, substations, large factories and mines, petrochemical enterprises, and other power grid and industrial users.

Product features

1. Low noise, reducing noise pollution to the environment;

2. Low partial discharge ensures stable and reliable operation of transformers;

3. Low temperature rise, strong overload capacity;

4. Low loss, optimized energy structure;

5. No leakage, high transformer sealing performance;

6. Maintenance free, reducing customer repair costs;

7. High impedance, high short-circuit resistance, providing transformer safety performance;

8. Adopting intelligent components and intelligent power plant design technology

Technical Parameter

Table 1. 220KV level three-phase dual winding non excitation voltage regulating power transformer

Transformer capacity（kVA）	High pressure（kV）	Low pressure（kV）	Connection symbol	No-load loss（kW）	Load loss（kW）	No-load current（％）	Short circuit impedance（％）
31500	220 ±2×2.5% 242±2×2.5%	6.3 6.6 10.5	YNd11	28.0	128	0.56	12--14
40000				32.0	149	0.56
50000				39.0	179	0.52
63000				46.0	209	0.52
75000		10.5 13.8		53.0	237	0.48
90000				61.0	273	0.44
120000				75.0	338	0.44
150000		10.5 13.8 15.75 18 20		89.0	400	0.40
160000				93.0	420	0.39
180000				102.0	459	0.36
240000				128.0	538	0.33

Table 2. 220KV level three-phase three winding non excitation voltage regulating power transformer

Transformer capacity（kVA）	High pressure（kV）	Medium voltage（kV）	Low pressure（kV）	Connection symbol	No-load loss（kW）	Load loss（kW）	No-load current（％）	Short circuit impedance（％）
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 8.5	YNyn0d11	32.0	153	0.56	High-medium 12--14 High-Low 22--24 Medium-Low 7--9
40000					38.0	183	0.50
50000					44.0	216	0.44
63000					52.0	257	0.44
90000			10.5 13.8 21 36 37 38.5		68.0	333	0.39
120000			10.5 13.8 21 36 37 38.5		84.0	410	0.39
150000			10.5 13.8 15.75 21 36 37 38.5		100	487	0.33
180000					113	555	0.33
240000					140	684	0.28
300000					166	807	0.24

Table 3. 220KV level three-phase dual winding on load tap changer power transformer

Transformer capacity（kVA）	High pressure（kV）	Low pressure（kV）	Connection symbol	No-load loss（kW）	Load loss（kW）	No-load current（％）	Short circuit impedance（％）
31500	220±8×1.25%； 230±8×1.25%	6.3 6.6 10.5 21 36 37 38.5	YNd11	30.0	128	0.57	12--14
40000				36.0	149	0.57
50000				43.0	179	0.53
63000				50.0	209	0.53
90000				64.0	273	0.45
120000		10.5 21 36 37 38.5		79.0	338	0.45
150000				92.0	400	0.41
180000				108	459	0.38
120000				81.0	337	0.45
150000		66 69		96.0	394	0.41
180000				112	451	0.38
240000				140	560	0.30

Table 4. 220KV level three-phase three winding on load tap changer power transformer

Transformer capacity（kVA）	High pressure（kV）	Medium voltage（kV）	Low pressure（kV）	Connection symbol	No-load loss（kW）	Load loss（kW）	No-load current（％）	Short circuit impedance（％）
31500	220±8×1.25% 230±8×1.25%	69 115 121	6.3 6.9 10.5 21 36 37 38.5	YNyn0d11	35.0	153	0.63	High-medium 12--14 High-Low 22--24 Medium-Low 7--9
40000					41.0	183	0.60
50000					48.0	216	0.60
63000					56.0	257	0.55
90000			10.5 21 36 37 38.5		73.0	333	0.44
120000					92.0	410	0.44
150000					108	487	0.39
180000					124	598	0.39
240000					154	741	0.35