China 110/66 kV power transformer manufactured by Rockwill with a low price and good quality. Supporting customization. It has exported to many countries like South Africa, Mozambique, Tanzania, Uganda, Ethiopia, etc.

have adopted series of important reforms on the 110kV level three-phase oil-immersed on-loadtap changing transformer referring material, process and structure. The transformer has the features of small size, light weight, high efficiency, low loss, low noise, reliable operation etc. which can reduce a large amount of power network loss and operation expense with significant economic benefits. It is suitable for power plant, substation, heavy section plant or enterprises etc.

1. Type: outdoor
2. Ambient temperature: max. temperature: +40℃; min. temperature: -30℃
3. Altitude: ≤1000m (temperature rise shall be corrected when＞1000m)
4. Relative humidity: ≤90% (25℃)
5. Installation place: without corrosive gas and apparent fouling.

110kVThree-phase Double-windingNLTCPowerTransformer

Rated Capacity（KVA)	Voltage ratio		Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
Rated Capacity（KVA)	HV	LV	Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
6300	110±22.5%； 115±22.5%； 121±2*2.5%；	6.3; 6.6; 10.5	YNd11	7.4	35	0.62	10.5
8000				8.9	42	0.62
10000				10.5	50	0.58
12500				12.4	59	0.58
16000				15	73	0.54
20000				17.6	88	0.54
25000				20.8	104	0.5
31500				24.6	123	0.48
40000				29.4	148	0.45
50000				35.2	175	0.42
63000				41.6	208	0.38
75000		13.8; 15.75; 18; 21		47.2	236	0.33	12~14
90000				54.4	272	0.3
120000				67.8	337	0.27
150000				80.1	399	0.24
180000				90	457	0.2

110kVThree-phase Three-windingNLTCPowerTransformer

Rated Capacity（KVA)	Voltage ratio		Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
Rated Capacity（KVA)	HV	LV	Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Step up	Step down
6300	110±22.5%； 115±22.5%； 121±2*2.5%；	6.6; 11; 24	YNyn0d11	8.9	44	0.66	HV-MV:17.5~18.5; HV-LV:10.5; MV-LV:6.5	HV-MV:10.5; HV-LV:18~19; MV-LV:6.5
8000				10.6	53	0.62
10000				12.6	62	0.59
12500				14.7	74	0.56
16000				17.9	90	0.53
20000				21.2	106	0.53
25000				24.6	126	0.48
31500				29.4	149	0.48
40000				34.8	179	0.44
50000				41.6	213	0.44
63000				49.2	256	0.4

110kVThree-phase Double-windingOLTCPowerTransformer

Rated Capacity（KVA)	Voltage ratio		Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
Rated Capacity（KVA)	HV	LV	Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
6300	110±8*1.25%；	6.3; 6.6; 10.5; 21	YNd11	8	35	0.64	10.5
8000				9.6	42	0.64
10000				11.3	50	0.59
12500				13.4	59	0.59
16000				16.1	73	0.55
20000				19.2	88	0.55
25000				22.7	104	0.51
31500				27	123	0.51
40000				32.3	156	0.46	12~18
50000				38.2	194	0.46
63000				45.4	232	0.42

110kV Three-phase Three-winding OLTC Power Transformer

Rated Capacity（KVA)	Voltage ratio			Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
Rated Capacity（KVA)	HV	MV	LV	Vector group	No-load loss(KW)	load loss(KW)	No-load current(%)	Short circuit impedance(%)
6300	110±8*1.25%；	36	6.6;11;24	YNyn0d11	9.6	44	0.76	HV-MV:10.5; HV-LV:18~19; MV-LV:6.5
8000					11.5	53	0.76
10000					13.6	62	0.71
12500					16.1	74	0.71
16000					19.3	90	0.67
20000					22.8	106	0.67
25000					27	126	0.62
31500					32.1	149	0.62
40000					38.5	179	0.58
50000					45.5	213	0.58
63000					54.1	256	0.53

66kV Three-phase PowerTransformerwith 0ff-loadTapChanger

Rated power（KVA)	Hve(KV)	Tap(KV)	LV(KV)	Vector group	Short circuit impedance(%)	No-load loss(W)			On-load loss(%)			No-load current(%)
Rated power（KVA)	Hve(KV)	Tap(KV)	LV(KV)	Vector group	Short circuit impedance(%)	The 9 type of loss	The 10 type of loss	The 11 type of loss	The 9 type of loss	The 10 type of loss	The 11 type of loss	No-load current(%)
6300	63; 66; 69	±2*2.5%	6.3; 6.6; 10.5; 11; 13.2; 15	YNd11	9	9.5	8.5	7.5	26	34	34	0.63
8000						11.4	10.2	9	42.8	40.4	40.4	0.63
10000						13.5	12.1	12.1	50.4	47.6	47.6	0.75
12500						15.9	14.2	12.6	59.9	56.5	56.5	0.53
16000						19.1	17.1	15.1	73.53	69.5	69.5	0.49
20000						22.6	20.3	17.9	89.1	84.2	84.2	0.49
25000						26.7	23.9	21.1	105.3	99.5	99.5	0.42
31500						31.8	28.4	25.1	126.9	120	120	0.42
40000						38	34	30	148.5	140.3	140.3	0.39
50000						44.9	40.1	35.4	184.5	174.3	174.3	0.39
63000						53.3	47.7	42.1	222.3	210	210	0.39

66kV Three-phase PowerTransformerwith On-loadTapChanger

Rated power（KVA)	Hve(KV)	Tap(KV)	LV(KV)	Vector group	Short circuit impedance(%)	No-load loss(W)			On-load loss(%)			No-load current(%)
Rated power（KVA)	Hve(KV)	Tap(KV)	LV(KV)	Vector group	Short circuit impedance(%)	The 9 type of loss	The 10 type of loss	The 11 type of loss	The 9 type of loss	The 10 type of loss	The 11 type of loss	No-load current(%)
6300	63; 66; 69	±8*1.25%	6.3；6.6；10.5；11；13.2；15	YNd11	9	10.5	9.4	8.25	36	34	34	0.63
8000						12.5	11.2	9.83	42.8	40.4	40.4	0.63
10000						14.7	13.1	11.6	50.4	47.6	47.6	0.75
12500						17.2	15.4	13.6	59.9	56.5	56.5	0.53
16000						20.6	18.5	16.3	73.53	69.5	69.5	0.49
20000						24.3	21.8	19.2	89.1	84.2	84.2	0.49
25000						28.6	25.6	22.6	105.3	99.5	99.5	0.42
31500						33.9	30.4	26.8	126.9	120	120	0.42
40000						40.4	36.2	31.9	148.5	140.3	140.3	0.39
50000						47.8	42.6	38.6	184.5	174.3	174.3	0.39
63000						56.3	50.4	44.4	222.3	210	210	0.39

110/66 kV power transformer schematic diagram

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