35kv Oil-immersed Distribution Power Transformer

Buy quality 35kV Oil-immersed Distribution Power Transformer from leading China manufacturer Wzonpa, offers ultra-low loss core, strong short-circuit withstand, high insulation. With oil-immersed cooling and smart remote control it ensures high efficiency and long service life for urban-rural grids, industry/mining.

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Product Description

The 35kV Oil-immersed Distribution Power Transformer from Wzonpa, a leading China manufacture, is engineered for modern power transmission networks including urban-rural grids, industrial plants, mining enterprises and agricultural infrastructure. The 35kV Oil-immersed Distribution Power Transformer delivers stable voltage regulation, excellent insulation performance and enhanced safety under complex operating environments, supporting long-distance and high-load distribution with high efficiency and durability.

What is a 35kV Oil-immersed Distribution Power Transformer?

The 35kV Oil-immersed Distribution Power Transformer is a high-voltage electrical device designed to step down and distribute power efficiently while maintaining low energy loss and strong operational stability in demanding grid systems.

Core Advantages

1.High Efficiency & Low Loss Design

Advanced silicon steel core technology and optimized magnetic flux path significantly reduce no-load loss and operating noise, ensuring long-term energy savings.

2.Strong Electrical & Mechanical Performance

The 35kV Oil-immersed Distribution Power Transformer features reinforced winding structures, improving short-circuit resistance and ensuring stable performance under sudden load changes.

3.Smart Operation Capability

Equipped with four remote functions—remote communication, remote testing, remote adjustment, and remote control—the system supports intelligent grid management and reduces on-site maintenance workload.

4.Enhanced Safety Protection

Built-in lightning resistance, high insulation strength and stable oil-immersed cooling structure ensure safe operation even in harsh environmental conditions.

Application Fields

The 35kV Oil-immersed Distribution Power Transformer is widely used in urban and rural power grids, industrial and mining enterprises, railway systems, and agricultural irrigation projects. It is especially suitable for substations requiring stable high-capacity energy distribution and continuous operation.

Maintenance Recommendations

Regular inspection of oil level, insulation condition and cooling performance is essential. The 35kV Oil-immersed Distribution Power Transformer should be checked for leakage, abnormal noise and temperature rise to ensure long service life and stable efficiency.

Main technical parameters

Item	Specification			Ⅲ300	Ⅲ500	Ⅲ600	I301		I501	I601		I800	I1200	I1500
1	Max.rated through current(A)			300	500	600	300		500	600		800	1200	1500
2	Ratedfrequency(Hz)			50 or60
3	Phase &connect model			3 phase for meutral point of Y connection			Single phase for selectable winding conection
4	Max.rated step voltage(V)			3300
5	Rated stepcurrent(kVA)			1000	1400	1500	1000		1400	1500		2640	3100	3500
6	Short circuit current (kA)		Termal(3s)	6	8	8	6		8	8		16	24	24
			Dynamic(peak)	15	20	20	15		20	20		40	60	60
7	Number ofoperating position			Linearregulation:7、10、12、14、16、18、22、34 Reversing and coase and fine regulation:±3~±17
8	Insulation level of tap changer (kV)	Rated Voltage		35		66		110			150		220
		Max.working voltage		40.5		72.5		126			170		252
		Power frequency withstand voltage (50Hz ,1min)		85		140		230			325		460
		Rated lightning impulse withstand voltage(1.2/50μs)		200		350		550			750		1050
9	Tap selector			4 grades of A,B,C and D according to the insulation level
10	Mechanical service life			Not less than 800,000
11	Electrical service life			Not less than 200,000
12	0il cauprtnent for diverter switch	Service pressure		4 3×10 Pa
		Leakage test		No leakage under 6×10 Pa 24 hours
		0ver pessure protection		Blasting capblast at(4~5)×10°Pa
		Protective relay		QJ4-25 oil flow speed set at 1.0 m/s±10%
13	0il drainage volume(L)			About 190～270
14	0ilfilling volume(L)			About 125～190
15	Weight(kg)			About 240～350
16	Motor-driven unit			MAE/MA7B

35KV Double-winding Distribution Transformers with off-circuit Tap Changer

Rated Power (kV?A)	Voltage combination and tapping range			Connection	No-load Loss (kW)	load Loss (kW)	No-load Current (%)	Short- circuit Impedance (%)
Rated Power (kV?A)	HV (kV)	Tapping Range of HV (%)	LV (kV)	symbol	No-load Loss (kW)	load Loss (kW)	No-load Current (%)	Short- circuit Impedance (%)
2000	35	±3×2.5	6.3 10.5	Yd11	2.30	19.2	0.50	6.5
2500	35	±3×2.5	6.3 10.5		2.72	20.6	0.50	6.5
3150	35 38.5	±3×2.5	6.3 10.5		3.23	24.7	0.50	7.0
4000					3.87	29.1	0.50
5000					4.64	34.2	0.50
6300					5.63	36.7	0.50	8.0
8000	35 38.5	±3×2.5	6.3 6.6 0.5	YNd11	7.87	40.6	0.40
10000					9.28	48.0	0.40
12500					10.9	56.8	0.35
16000					13.1	70.3	0.35
20000					15.5	82.7	0.35
25000					18.3	97.8	0.30	10.0
31500					21.8	116	0.30	10.0

630-2500/35 Series Three-phase Double-winding Distribution Transformers with off-circuit Tap Changer

Rated capacily (KVA)	Voltage		Vector Group	Loss value for S9 type transformer		Loss value for S10 type transformer		Loss value for S11 type transformer		No-load current (%)	Short-Circuit Impedance (%)	Weight		Appearance Dimension(mm)			Gauge (mm)
Rated capacily (KVA)	Low-voltage	High-voltage	Vector Group	No-load	Full-load	No-load	Full-load	No-load	Full-load	No-load current (%)	Short-Circuit Impedance (%)	Oil-wight	Total-weight	L	W	H	Gauge (mm)
630	35 38.5 ±5% or ±2× 2.5%	0.4	Yyn0 Dyn11	1.04	8.28	0.94	7.87	0.83	7.87	1.1	6.5	0.65	2.9	2100	1300	2300	820
800				1.23	9.9	1.11	9.4	0.98	9.4	1		0.7	3.2	2200	1350	2350	820
1000				1.44	12.15	1.3	11.54	1.15	11.54	1		0.85	3.5	2350	1450	2400	820
1250				1.76	14.67	1.58	13.94	1.41	13.94	0.9		1.01	3.84	2500	1600	2450	1070
1600				2.12	17.55	1.91	16.67	1.7	16.67	0.8		1.2	5	2600	1700	2500	1070
2000				2.72	19.35	2.45	18.38	2.18	18.38	0.7		1.28	6	2730	1800	2600	1070
2500				3.2	20.7	2.88	19.67	2.56	19.67	0.6		1.4	7	2870	1900	2700	1070

parameters630-2500

630-2500/35 Series Three-phase Double-winding Distribution Transformers with off-circuit Tap Changer

Rated capacity (KVA)	Voltage ralio (KV) HV LV		Cannecin Smtol	loss va u serial tra No-oad loss	(KW) es forS9 nsfomer Full-load loss	(kW) loss vaues far S9 seria transfomer No-load Ful-load loss loss		loss value seria tran No-load loss	( k W ) s for S11 sformer Ful ad	No-load CLIrent (%)	Impedance (%)	Qil weight	Total weight	Outline Dimension(mm)			Gauge (mm)
Rated capacity (KVA)	Voltage ralio (KV) HV LV		Cannecin Smtol	loss va u serial tra No-oad loss	(KW) es forS9 nsfomer Full-load loss			loss value seria tran No-load loss	( k W ) s for S11 sformer Ful ad	No-load CLIrent (%)	Impedance (%)	Qil weight	Total weight	L	w	H	Gauge (mm)
630	35			1.04	8.28	0.94	7.87	0.83	7.87	1.1		0.65	2.9	2100	1300	2300	820
800	38.5	6.3		1.23	9.9	1.11	9.4	0.98	9.4	1		0.7	3.2	2200	1350	2350	820
1000	±5%	6.6	Yd11	1.44	12.15	1.3	11.54	1.15	11.54	1		0.85	3.5	2350	1450	2400	820
1250		10		1.76	14.67	1.58	13.94	1.41	13.94	0.9	6.5	1.01	3.84	2500	1600	2450	1070
1600		10.5		2.12	17.55	1.91	16.67	1.7	16.67	0.8		1.2	5	2600	1700	2500	1070
2000	±2× 2.5%	11		2.72	19.35	2.45	18.38	2.18	18.38	0.7		1.28	6	2730	1800	2600	1070
2500				3.2	20.7	2.88	19.67	2.56	19.67	0.6		1.4	7	2870	1900	2700	1070

Double-winding parameters

35kV 630kVA～31500kVA Three-phase double-winding non-excitation regulating power transformer

Rated Power (kVA)	Voltage combination and tapping range			Vector Group	No-load Loss(kW)	load Loss(kW)	No-load Current(%)	Short-circuit Impedance(%)
Rated Power (kVA)	HV(kV)	Tapping Range of HV(%)	LV(kV)	Vector Group	No-load Loss(kW)	load Loss(kW)	No-load Current(%)	Short-circuit Impedance(%)
630	35	±2×2.5 ±5	3.15 6.3 10.5	Yd11	0.830	7.86	0.65	6.5
800					0.980	9.40	0.65
1000					1.15	11.5	0.65
1250					1.40	13.9	0.55
1600					1.69	16.6	0.45
2000					2.17	18.3	0.45
2500					2.56	19.6	0.45
3150	35 38.5	±2×2.5 ±5	3.15 6.3 10.5		3.04	23.0	0.45	7.0
4000					3.61	27.3	0.45
5000					4.32	31.3	0.45
6300					5.24	35.0	0.45	8.0
8000	35 38.5	±2×2.5	3.15 6.3 10.5	YNd11	7.20	38.4	0.35
10000					8.70	45.3	0.35
12500					10.0	53.8	0.30
16000					12.1	65.8	0.30
20000					14.4	79.5	0.30
25000					17.0	94.0	0.25	10.0
31500					20.2	112	0.25	10.0

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