35kV Dry Type OLTC Power Transformer

Our 35kV dry-type three-phase two-winding on-load tap-changing power transformers are high-performance solutions for distribution systems requiring stable voltage and frequent regulation.

• Equipped with on-load tap-changer offering ±4×2.5% range for continuous, stable voltage output without power interruption.

• HV side covers 35kV to 38.5kV; LV options from 6kV to 11kV with Dyn11 or Yd11 vector groups for flexible system compatibility.

• Rated from 2000 kVA to 25000 kVA with no-load current below 1% for significant energy savings.

• Short-circuit impedance from 7% to 10%; load loss data provided for B, F, and H insulation classes to meet different temperature rise requirements.

• Dry-type epoxy insulation is non-flammable, explosion-proof, and maintenance-free, ideal for indoor and fire-sensitive installations.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Core Positioning

This series comprises 35kV dry-type on-load tap-changing (OLTC) power transformers, featuring three-phase, two-winding construction. Designed for distribution systems requiring stable voltage and frequent or automatic voltage regulation, the products meet high standards for energy efficiency and reliability. Utilizing premium dry-type insulation materials, they ensure safe, stable, and long-lasting operation in indoor and specialized environments.

Technical Specifications

Rated capacity (kVA)	Rated voltage and tapping range			Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	On load Losses (kW)
Rated capacity (kVA)	HV	Tapping range	LV	Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	B (100℃)	F (120℃)	H (145℃)
2000	35	±4×2.5%	6 6.3 10 10.5 11	Dyn11 Yd11	0.65	7	4.05	17.9	19	20.3
2500					0.65	7	4.69	21.3	22.6	24.2
3150					0.6	8	5.67	24	25.4	27.2
4000					0.6		6.64	28.7	30.4	32.6
5000					0.5		7.85	34	36.1	38.6
6300					0.5		9.27	39.4	41.8	44.7
8000					0.45	9	10.6	44.8	47.5	50.8
10000					0.45		12.1	53.9	57.1	61.2
12500					0.35		14.7	62.7	66.5	71.1
16000					0.35		18.1	73.8	78.2	83.7
20000					0.3	10	21.4	83	88	94.2
25000					0.3	10	25.2	98.2	104	111

Key Technical Features

Rated Capacity: Ranges from 2000 kVA to 25000 kVA across multiple ratings to suit various load requirements.

Voltage Regulation: Equipped with on-load tap-changing capability, offering a tapping range of ±4×2.5% for continuous and stable voltage output.

Voltage Combinations: High Voltage (HV) side supports 35kV, 36kV, 37kV, and 38.5kV. Low Voltage (LV) side options include 6kV, 6.3kV, 10kV, 10.5kV, and 11kV.

Vector Group: Compatible with Dyn11 and Yd11 configurations to adapt to different grid structures.

Low-Loss Design: Excellent control over no-load losses and load losses. Load loss values are provided for three insulation classes: B (100℃), F (120℃), and H (145℃), balancing energy efficiency and temperature rise control.

Low No-Load Current: All ratings feature a no-load current below 1%, ensuring significant energy savings.

Short-Circuit Impedance: Appropriately designed for enhanced system stability.

Typical Applications

Suitable for industrial and mining enterprises, urban power grids, power plants, substations, renewable energy plants, and locations with high requirements for fire safety, explosion prevention, and environmental protection. Particularly ideal for distribution systems with limited installation space and a need for frequent voltage regulation.

These transformers feature a compact design, are maintenance-free, environmentally friendly, non-toxic, and offer excellent fire resistance. Customizable configurations are available, making them an optimal choice for modern smart grids and industrial distribution systems.

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