35kV Oil-immersed Distribution Transformer OCTC Double-Winding 50-1600kVA

The Liyond 35kV series oil-immersed distribution transformer is a high-efficiency power solution engineered for AC 50Hz systems with rated voltages up to 35kV. Designed specifically for small to medium-sized substations, industrial enterprises, and public institutions, these units excel in managing power distribution and lighting loads. All units are manufactured in strict compliance with the GB1094.1-5 international standards.

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35kV Oil-immersed Distribution Transformer OCTC Double-Winding 50-1600kVA

Electrical Products

Features
Technical Specifications

Key Structural Features of 35kV Oil-Immersed Distribution Transformer

High-Efficiency Core Design: The core utilizes high-permeability, grain-oriented cold-rolled silicon steel sheets. It features a full-oblique joint stacking method with a multi-step circular cross-section to minimize energy loss.

Precision Winding Technology: All windings are concentric coils. They utilize corrugated oil passages and a non-varnish process, secured by tightening tapes for enhanced mechanical strength.

Off-Circuit Tap Changing: High-voltage windings include specific taps for voltage adjustment. The tap changer is mounted on the tank cover; please note that the power supply must be disconnected before switching the tap position.

Robust Safety Protection:

Models from 800kVA to 1600kVA are equipped with gas relays.

Models from 800kVA to 1600kVA include a pressure relief valve for internal fault protection.

Oil Preservation System: Every unit features a conservator (oil cabinet) with an integrated oil level gauge. A moisture absorber (breather) with an oil seal is added to protect insulation integrity.

Temperature Monitoring: A thermometer socket is standard on the tank top. Units from 1000kVA to 1600kVA include an outdoor signal thermometer.

Main Technical Parameters

Our distribution transformers are optimized for mid-range power requirements with high reliability.

Rated Capacity (kVA)	Voltage Combination			Connection Symbol	Loss (kW)		No‑Load Current (%)	Short‑Circuit Impedance (%)	Weight(kg)
	Voltage Combination				S11 type				Weight(kg)
	High Voltage (kV)	HV Tapping Range	Low Voltage (kV)		Losses (Load)	Losses (No-load)			Weight (Oil)	Weight (Total)
50	38.5 35	±5% ±2×2.5%	0.4	Yyn0 Dyn11	1.21/1.15	0.17	2.00	6.5	220	610
100					2.01/1.92	0.23	1.8		250	810
125					2.38/2.26	0.27	1.7		255	885
160					2.82/2.69	0.29	1.6		305	1040
200					3.33/3.16	0.34	1.50		403	1400
250					3.95/3.76	0.41	1.4		412	1450
315					4.76/4.53	0.49	1.4		430	1600
400					5.75/5.47	0.58	1.3		460	1700
500					6.92/6.58	0.69	1.2		525	2025
630					7.87	0.83	1.1		580	2315
800					9.41	0.98	1		645	2715
1000					11.54	1.15	1		745	3315
1250					13.94	1.41	0.9		825	3730
1600					16.67	1.70	0.8		955	4420

Outline and Mounting Dimensions

Rated Capacity (kVA)	Outline and Mounting Dimensions (mm)
Rated Capacity (kVA)	L	W	H	C1	C2
50	1140	915	1430	550	550
100	1140	1040	1550	550	550
125	1140	1040	1580	550	550
160	1660	880	1620	660	660
200	1660	890	1650	660	660
250	1660	900	1690	660	660
315	1745	920	1760	660	660
400	1785	1000	1810	660	660
500	1815	1100	1850	820	820
630	1830	1115	1920	820	820
800	1905	1230	1960	820	820
1000	2260	1250	2135	820	820
1250	2415	1320	2165	820	820
1600	2505	1450	2235	820	820