Three-Phase Oil Immersed Distribution Transformer with On-Load Tap Changer

Three-Phase Oil Immersed Distribution Transformer with On-Load Tap Changer are important equipment in modern distribution systems, also one of Ceho's important products. These products can regulate voltage without interrupting the load, improving power quality and grid stability.

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Product Description

This Three-Phase Oil Immersed Distribution Transformer with On-Load Tap Changer is made of high-quality CRGO cold-rolled silicon steel, ensuring low no-load loss. It has a good energy-saving effect and remarkable social and economic benefits. Strong resistance to short circuits and lightning strikes; High-reliability support structure design for it can be used both outdoors and indoors.

The voltage and rated power of our transformers can be customized. Available voltages: 6kV, 6.3kV, 10kV, 10.5kV, 11kV, 12.47kV, 13.2kV, 13.8kV, 15kV, 20kV, 22kV, 24kV, 33kV, 34.5kV, 35kV, 38kV...... 110 kilovolts.

Outline drawing

Technical specifications

Rated Power (kVA)	Rated Voltage(kV)		Vector Group	No-load loss(W)	Load loss(W)	Impedance(%)
Rated Power (kVA)	HV	LV	Vector Group	No-load loss(W)	Load loss(W)	Impedance(%)
30	13.8 13.2 11 10.5 10 6.3 6 Tapping range: ±5%; ±2*2.5%	0.4 0.433 0.415	Dyn11 Yyn0 Yzn11 Dyn5	100	600	5.5
50				130	870
80				180	1250
100				200	1500
125				240	1800
160				280	2200
200				340	2600
250				400	3050
315				480	3650
400				570	4300
500				680	5150
630				810	6200	6
800				980	7500
1000				1150	10300
1250				1360	12000
1600				1640	14500
2000				1960	17800
2500				2310	20700
3150				2730	24300

Feature	Description
Voltage Regulation	Allows on-load voltage adjustment via tap changer while the transformer is energized, typically with a regulation range of ±15% or more .
Tap Changer Type	Vacuum-type OLTC is preferred for reliability and long life; must comply with IEC 60214 or AS 60214.1 standards .
Cooling Method	ONAN (Oil Natural Air Natural) is standard; some variants may use OFAF (Oil Forced Air Forced) for higher capacities .
Insulation & Oil	Mineral oil-immersed for insulation and cooling; oil must meet IEC 60296 standards. Oil in the diverter switch compartment must be isolated from the main tank oil .
Construction	Typically core-type, with copper windings, corrugated steel tank, and hermetically sealed design to prevent moisture ingress .
Tap Control	Supports automatic, local manual (electrical), and emergency manual (mechanical) operation. Includes limit switches, thermal protection, and position indicators .

Normal Environment conditions

1. Ambient Temperature: No more than +40℃, No less than -25℃, The monthly average temperature is no more than +30℃., The yearly average temperature is no more than +20℃.

2. Altitude: No more than 1000m.

3. The power supply voltage's wave is similar to a sine wave.

4. Three-Phase Oil Immersed Distribution Transformer with On-Load Tap Changer power supply voltage is approximately symmetrical.

5. The total harmonic content of load current shall not exceed 5% of rated current;

6. Installation Site: Indoor or outdoor.

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Contact Info

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Address

No. 381, Jingqi Road, Economic Development Zone, Yueqing City, Zhejiang Province, China
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Tel

+86-19905879911
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Email

kevin@ningboziyao.com

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