10kV Oil-Immersed NLTC Distribution Transformer

Our 10kV oil-immersed three-phase two-winding off-circuit tap-changing distribution transformers are versatile, cost-effective solutions for end-users in distribution networks.

• HV side compatible with 6kV to 10.5kV; LV side at 0.4kV with ±2×2.5% or ±5% off-circuit taps for grid adaptability.

• Rated from 30 kVA to 2500 kVA with no-load current as low as 0.32% for low lifecycle operating costs.

• Three vector groups available: Dyn11, Yzn11, and Yyn0 for flexible system matching on harmonics, unbalance, and grounding.

• Short-circuit impedance at 4% to 5% ensures effective fault current limitation and operational safety.

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

Core Positioning

This product series represents a versatile and cost-effective three-phase distribution transformer designed for end-users in 10kV and below distribution networks. Widely used in industrial, commercial, residential areas, infrastructure, and distributed generation integration scenarios, it serves as a primary component for the safe and reliable conversion from medium-voltage distribution to low-voltage (400V) power consumption.

Technical Specifications

Rated capacity (kVA)	Rated voltage and tapping range			Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (W)(11)	On load Losses(W)(11)
Rated capacity (kVA)	HV	Tapping range	LV	Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (W)(11)	Dyn11/Yzn11	Yyn0
30	10	±2×2.5 ±5	0.4	Dyn11 Yzn11 Yyn0	1.2	4	65	455	430
50					1.04		80	655	625
63					0.96		90	785	745
80					0.96		105	945	900
100					0.88		120	1140	1080
125					0.88		135	1360	1295
160					0.8		160	1665	1585
200					0.8		190	1970	1870
250					0.72		230	2300	2195
315					0.72		270	2760	2630
400					0.64		330	3250	3095
500					0.64		385	3900	3710
630					0.48	4.5	460	4460
800					0.48		560	5400
1000					0.48		665	7415
1250					0.4		780	8640
1600					0.4		940	10440
2000					0.32	5	1085	13180
2500					0.32	5	1280	15270

Core Advantages and Features

1. Comprehensive Voltage Compatibility and Flexible Tapping Configuration:

- The high-voltage side is fully compatible with common domestic and international distribution voltage standards, including 6kV, 6.3kV, 10kV, and 10.5kV. It offers two off-circuit tap-changing options, ±2×2.5% or ±5%, to meet the requirements of different grid environments.

- The low-voltage side provides a standard output of 0.4kV, directly supplying power to end-use equipment.

2. Diverse Vector Group Selection:

- Offers three standard vector groups: Dyn11, Yzn11, and Yyn0. Users can flexibly select based on specific requirements of the power supply system regarding harmonic suppression, unbalanced load capability, grounding methods, and relay protection, ensuring high adaptability.

3. Excellent Energy Savings and Economy:

- The capacity range spans from 30 kVA to 2500 kVA, meeting the full spectrum of needs from small commercial sites to medium-scale industrial loads.

- Designed with low losses, the no-load current is as low as 0.32%. Both no-load and load losses (corresponding to different vector groups) are optimized to comply with energy efficiency standards, resulting in low lifecycle operating costs.

4. High Reliability and Easy Maintenance:

- Short-circuit impedance is reasonably designed (4%, 4.5%, 5%), effectively limiting low-voltage side short-circuit currents.

- The off-circuit tap-changing structure is simple and reliable. The oil-immersed insulation provides good heat dissipation, making it suitable for various installation environments, both outdoor and indoor, with low maintenance requirements.

Typical Applications

10kV distribution substations, pole-mounted transformers, and pad-mounted substations in urban and rural power grids.

Distribution rooms for various buildings such as factories, shopping malls, schools, hospitals, and residential communities.

10kV grid-connection step-up transformers for distributed generation sources like photovoltaic and wind power.

Auxiliary power supply systems for infrastructure such as railways, highways, and airports.

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