35kV Oil-immersed Power Transformer OCTC Double-Winding 800-31500kVA for Substation

The Liyond 35kV series oil-immersed power transformer is a high-performance solution designed for power systems with an AC frequency of 50Hz and rated voltages of 35kV and below. Engineered for reliability in small to medium-sized substations, these units combine advanced core technology with robust safety features to ensure stable power distribution.

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35kV Oil-immersed Power Transformer OCTC Double-Winding 800-31500kVA for Substation

Electrical Products

Features
Technical Specifications

Key Structural Features of Oil-Immersed Power Transformer

High-Efficiency Iron Core: Utilizes high-permeability, grain-oriented cold-rolled silicon steel. The core features a full-oblique joint stacking method and a multi-step circular cross-section to minimize losses.

Precision Windings: All windings are concentric. The high-voltage side includes taps for voltage adjustment; please note that power must be disconnected before switching the tap position (off-circuit).

Safety & Protection: Every unit is equipped with a gas relay and a pressure relief valve to prevent damage from internal faults.

Oil Preservation: Transformers include a conservator tank with an integrated oil level gauge and a moisture absorber (breather) featuring an oil seal for enhanced insulation protection.

Temperature Monitoring: A thermometer socket is provided on the tank top. Units with a capacity of 1000kVA or higher come standard with an outdoor signal thermometer.

Main Technical Parameters

Our transformers are manufactured in strict accordance with GB1094.1-5 standards to meet international quality requirements.

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)
800	38.5 35	±5% ±2×2.5%	3.15 6.6 10.5	Yd11	9.41	0.98	1.00	6.5	90	3040
1000					11.54	1.15	1		850	3410
1250					13.94	1.41	0.9		950	3890
1600					16.67	1.70	0.8		1060	4620
2000					18.38	2.18	0.70		1195	5345
2500					19.67	2.56	0.6		1285	5960
3150					23.09	3.04	0.56	7	1470	6695
4000					27.36	3.62	0.56		1760	8350
5000					31.38	4.32	0.48		1850	9400
6300					35.06	5.25	0.48	7.5	2200	11300
8000				YNd11	38.48	7.2	0.42		2450	13240
10000					45.32	8.7	0.42		3230	16600
12500					53.87	10.08	0.40	8	3585	19400
16000					65.84	12.16	0.40		4420	23100
20000					79.52	14.40	0.40		6060	29700
25000					94.05	17.02	0.32		6490	38200
31500					112.86	20.22	0.32		6890	40300

Outline and Mounting Dimensions

Rated Capacity (kVA)	Outline and Mounting Dimensions (mm)
Rated Capacity (kVA)	L	W	H	C1	C2
800	2140	1320	2120	820	820
1000	2400	1330	2170	820	820
1250	2470	1350	2190	820	820
1600	2550	1375	2250	820	820
2000	2700	1400	2300	1070	1070
2500	2520	2300	2365	1070	1070
3150	2600	2350	2410	1070	1070
4000	2680	2560	2490	1070	1070
5000	2730	2750	2550	1070	1070
6300	2960	2800	3080	1475	1475
8000	3170	2610	3210	1475	1475
10000	3250	3220	3400	1475	1475
12500	3370	3260	3540	1475	1475
16000	3470	3280	3580	1475	1475
20000	3950	3450	3850	1475	1475
25000	4570	3800	3900	1475	1475
31500	5000	4150	4000	1475	1475