11KV Fully Sealed Three-phase Oil-immersed Power Distribution Transformer

11kv Oil immersed Transformer Technical Specifications

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- Input voltage: 11kV
- Output voltage: 0.4kV 0.415 kv 0.420kv 0.430kv 0.440kv
- Capacity: 25-2500 kva(Up to 10MVA)
- Frequency: 50/60 HZ
- Remark: voltage, capacity, frequency, connection group and loss can be customized according to customer requirements

Capacity	Rated voltage&Off-load tapping				Vector GroupSymbol		NO-load loss(W)	Load loss(W)	NO-load current(%)	Short circuit impedance(%)
	H.V(kv)	High pressure Tap range(%)		L.V(kv)
30 kva	11 10.5 10 6.3 6	±5% ±2x2.5%		0.4 0.415 0.420 0.430 0.440	Dyn11 Yyn0		100	630/600	1.5	4
50 kva							130	910/870	1.3	4
60 kva							150	1090/1040	1.2	4
75 kva							180	1310/1250	1.2	4
100 kva							200	1580/1500	1.1	4
125 kva							240	1890/1800	1.1	4
150 kva							280	2310/2200	1	4
200 kva							340	2730/2600	1	4
250 kva							400	3200/3050	0.9	4
300 kva							480	3830/3650	0.9	4
400 kva							570	4520/4300	0.8	4
500 kva							680	5410/5150	0.8	4
600 kva							810	6200	0.6	4.5
750 kva							980	7500	0.6	4.5
1000 kva							1150	10300	0.6	4.5
1250 kva							1360	12000	0.5	4.5
1500 kva							1640	14500	0.5	4.5
2000 kva							1940	18300	0.4	5
2500 kva							2290	21200	0.4	5

 

Against the backdrop of global electricity demand growth, 11kV three-phase oil immersed transformers are widely used in rural power grids, industry, commerce, new energy, public facilities, and other fields. High reliability operational verification in over 50 countries and regions worldwide; Already sold to countries and regions such as Tanzania, Zimbabwe, Ghana, South Africa, Kenya, Zambia, Sudan, Libya, Congo, United Arab Emirates, Saudi Arabia, Iraq, Syria, Bangladesh, etc

 

Parameter

1. S11-M 11kV Three Phase Oil Immersed Distribution Transformer

Rated capacity (kvA)	Voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)	Reference Dimensions(mm) L*W*H	Total Weight (kg)
30	High Voltage H.V. 6,6.3,6.6,10,10.5,11 ±2×2.5%, ±5% Low Voltage L.V. 0.4	Dyn11 Yyn0 Yzn11	4	100	630/600	1.5	690x510x920	275
50				130	910/870	1.3	730x510x960	340
63				150	1090/1040	1.2	750x550x1000	385
80				180	1310/1250	1.2	790x620x1020	450
100				200	1580/1500	1.1	790x700x1040	520
125				240	1890/1800	1.1	840x800x1070	625
160				280	2310/2200	1.0	1070x670x1130	695
200				340	2370/2600	1.0	1140x750x1140	795
250				400	3200/3050	0.9	1200x800x1190	955
315				480	3830/3650	0.9	1300x860x1210	1085
400				570	4520/4300	0.8	1380x900x1240	1290
500				680	5410/5100	0.8	1450x950x1300	1590
630		Dyn11 Yyn0	4.5	810	6200	0.6	1500x970x1360	1850
800				980	7500	0.6	1660x1140x1400	2210
1000				1150	10300	0.6	1690x1190x1530	2570
1250				1360	12000	0.5	1760x1230x1600	3115
1600				1640	14500	0.5	1800x1250x1660	3520
2000			5	1940	18300	0.4	1930x1360x1490	4060
2500				2290	21200	0.4	2080x1360x1570	5105

 

2. S13-M 11kV Three Phase Oil Immersed Distribution Transformer

 

Rated capacity (kvA)	Voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)	Reference Dimensions(mm) L*W*H	Total Weight (kg)
30	High Voltage H.V. 6,6.3,6.6,10,10.5,11 ±2×2.5%, ±5% Low Voltage L.V. 0.4	Dyn11 Yyn0 Yzn11	4	80	630/600	1.5	695x490x860	260
50				100	910/870	1.3	725x520x955	365
63				110	1090/1040	1.2	750x535x970	415
80				130	1310/1250	1.2	770x565x985	465
100				150	1580/1500	1.1	800x595x1000	545
125				170	1890/1800	1.1	815x670x1010	585
160				200	2310/2200	1.0	1015x645x1055	695
200				240	2370/2600	1.0	1020x650x1115	810
250				290	3200/3050	0.9	1140x730x1120	930
315				340	3830/3650	0.9	1195x785x1175	1075
400				410	4520/4300	0.8	1265x855x1195	1255
500				480	5410/5100	0.8	1325x915x1240	1435
630		Dyn11 Yyn0	4.5	570	6200	0.6	1465x960x1295	1880
800				700	7500	0.6	1515x995x1340	2145
1000				830	10300	0.6	1605x1095x1460	2455
1250				970	12000	0.5	1685x1145x1485	2840
1600				1170	14500	0.5	1775x1225x1580	3310
2000			5	1550	18300	0.4	1855x1265x1600	3960
2500				1830	21200	0.4	1885x1305x1780	4980

 

3. S14-M 11kV Three Phase Oil Immersed Distribution Transformer

 

Rated capacity (kvA)	Voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)	Reference Dimensions(mm) L*W*H	Total Weight (kg)
30	High Voltage H.V. 6,6.3,6.6,10,10.5,11 ±2×2.5%, ±5% Low Voltage L.V. 0.4	Dyn11 Yyn0 Yzn11	4	80	505/480	1.5	785x710x880	370
50				100	730/695	1.3	800x730x940	480
63				110	870/830	1.2	815x720x970	535
80				130	1050/1000	1.2	830x740x990	580
100				150	1260/1200	1.1	875x790x1010	705
125				170	1510/1440	1.1	875x770x1050	775
160				200	1850/1760	1.0	935x820x1140	975
200				240	2180/2080	1.0	995x870x1140	1140
250				290	2560/2440	0.9	995x900x1180	1240
315				340	3060/2920	0.9	1030x880x1250	1425
400				410	3610/3440	0.8	1075x910x1270	1635
500				480	4330/4120	0.8	1120x930x1320	1950
630		Dyn11 Yyn0	4.5	570	4960	0.6	1165x950x1350	2150
800				700	6000	0.6	1210x1050x1390	2515
1000				830	8240	0.6	1520x1020x1450	2635
1250				970	9600	0.5	1630x1090x1540	3210
1600				1170	11600	0.5	1680x1150x1600	3905
2000			5	1550	14600	0.4	1890x1300x1600	4130
2500				1830	16900	0.4	1990x1360x1700	5250

11kv Oil immersed Transformer Case show

 

50 KVA 11kv 3 phase transformer specifications type and data sheet

Delivered to	South Africa
Year	2024
Model	S11-50KVA-11/0.415KV
Type	Oil Immersed Distribution Transformer
Standard	IEC 60076
Rated Power	50 KVA
Frequency	50 HZ
Phase	Three
Cooling Type	ONAN
Primary Voltage	11 KV
Secondary Voltage	0.415 KV
Winding Material	Copper
Vector Group	Dyn11
Impedance	6%
Tap Changer
Tapping Range	±2*2.5%
No Load Loss	2.8KW
On Load Loss	20KW
Accessories	Standard Configuration
Remarks	N/A

Customer Case

11kv Oil immersed Transformer FAQ

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What is an 11kV three-phase oil immersed transformer?

A three-phase oil immersed transformer is a power transformer that is cooled and insulated by insulating oil. It is designed for use in three-phase AC power systems and can convert high voltage electrical energy into low voltage (such as 11kV/400V). It is widely used in industrial, commercial, and power grid distribution.

 

What are the typical application scenarios?

*Voltage conversion of urban distribution network (11kV → 400V);

*Power distribution in industrial plants such as mines and petrochemicals;

*Grid connection of renewable energy power plants (such as wind farms);

*Hospitals, data centers, and other places that require high reliability power supply.

 

What is the rated capacity range ?

The common capacity ranges from 25kVA to 10MVA, with the 100kVA to 2000kVA models of 11kV/400V being the most widely used, depending on the load requirements.

 

What is the difference in maintenance cycle between 11kV dry-type and oil immersed transformers?

Dry type: Dust removal inspection every 2-3 years; Oil immersed: Check the oil level, oil quality (pressure resistance value, acidity), sealing, and radiator cleaning once a year; Comprehensive oil sample testing every 3-5 years (such as medium loss and moisture content).

 

How to choose between three-phase oil immersed transformer and dry-type transformer?

-11kV oil immersed transformers are suitable for outdoor, high-capacity, and high load scenarios, with low cost but requiring regular maintenance;

-11kV dry-type transformer: used in indoor environments with high fire protection requirements (such as shopping malls and subways), maintenance free but expensive.

 

How to determine whether a transformer needs to change oil or filter oil?

-Oil quality testing: Regularly test the breakdown voltage (should be ≥ 30kV), water content (≤ 20ppm), and acid value of the oil;

-Cloudy oil color: The oil becomes darker or there is an increase in suspended matter;

-Decreased insulation performance: determined by withstand voltage test.

 

 

What are the reasons for the abnormal temperature rise during operation?

-Long term overload;

-Cooling system malfunction (fan/oil pump shutdown);

-Oil circuit blockage or insufficient oil volume;

-Internal short circuit or poor contact.

 

How to deal with oil leakage in oil immersed transformers?

-Slight oil leakage: tighten bolts or replace gaskets;

-Serious oil leakage: Stop immediately, drain the oil and repair or replace components;

 

What protective devices must be configured?

*High voltage side: circuit breaker or fuse (with overcurrent/short-circuit protection);

*Body protection: gas relay, pressure relief valve, oil temperature gauge;

*System protection: lightning arrester (anti lightning impulse)

*Monitoring device: oil level gauge, online oil chromatography analyzer (high-end configuration).

 

 

What are the key points to pay attention to when installing?

-Stable foundation, horizontal installation, avoiding tilting;

-Reserve sufficient heat dissipation space (such as at least 1.5 meters away from the wall);

-Grounding resistance ≤ 4 Ω;

-Check the oil level, sealing, and cleanliness of the casing.