10kV Oil-Immersed Distribution Transformer With 3d Wound Core

Yulan Transformer manufactures 10kV oil-immersed distribution transformers with three-dimensional wound cores, featuring rated capacities ranging from 30 kVA to 2,500 kVA. These10KV Oil-immersed distribution transformer with 3D wound core offers advantages such as low no-load losses and noise levels reduced by 3–5 dB, making them suitable for power grid, industrial, and commercial distribution applications. We welcome inquiries regarding procurement, ordering, or specification of this model for your projects.

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Product Description

When selecting 10kV distribution transformers, no-load loss and noise levels are key metrics that have long received significant attention. Traditional stacked-core structures are limited in their potential for further reducing loss and noise due to the presence of joints and inherent asymmetries in the magnetic circuit. In contrast, the 10KV Oil-immersed distribution transformer with 3D wound core utilizes a different forming method, resulting in equal magnetic path lengths across all three phases and eliminating joints entirely. Yulan Transformer applies this structural design to liquid-immersed distribution transformers with capacities ranging from 30kVA to 2500kVA; these units support primary voltages of 6kV, 10kV, or 35kV and a secondary output of 0.4kV.

Differences from Stacked-Core Structures

The 10KV Oil-immersed distribution transformer with 3D wound core is formed by winding continuous strips of grain-oriented silicon steel, eliminating lap joints in the magnetic circuit. The direction of magnetic flux aligns closely with the orientation of the silicon steel, leading to significantly lower no-load losses and no-load currents compared to stacked-core units of the same capacity. Furthermore, the equal lengths of the three-phase magnetic paths result in lower no-load current imbalance than traditional designs.

Regarding material utilization, the winding process minimizes scrap, typically resulting in a smaller footprint and lighter weight than stacked-core alternatives for the same capacity. Noise levels are also 3 to 5 dB lower, making these transformers suitable for indoor substations with strict acoustic requirements.

Manufacturing and Assembly

After winding, the core undergoes an annealing process to restore the magnetic properties of the silicon steel. Annealing temperatures and durations are controlled according to a precise curve, which directly influences the stability of no-load loss performance. Low-voltage coils are wound using copper foil, while high-voltage coils are formed using adhesive-coated paper that is heat-cured under pressure, ensuring mechanical strength sufficient to withstand short-circuit conditions.

Following assembly, the active part undergoes kerosene vapor phase vacuum drying to remove moisture and gases from the insulation materials. The tank and external structural components are shot-blasted to remove rust and then powder-coated; the resulting finish offers the uniformity and adhesion required for outdoor service.

10kv Oil-Immersed Distribution Transformer With 3d Wound Core

Application Scenarios

10KV Oil-immersed distribution transformer with 3D wound core is suitable for urban and rural grid upgrades, power distribution for industrial and mining enterprises, commercial buildings, and step-up or step-down applications in new energy generation. Their low-noise characteristics are particularly beneficial for noise-sensitive locations such as residential distribution rooms and indoor substations.

Technical Parameters

Item	Standards
Executive Standard	IEC, GB, ANSI/IEEE, NEMA
Rated Capacity	30 kVA to 2500 kVA
Primary Rated Voltage	6 kV, 10 kV, 35 kV (depending on specific model)
Secondary Rated Voltage	0.4 kV
Number of Taps	5 taps (off-circuit tap changing)
Rated Frequency	50 Hz / 60 Hz
Number of Phases	Three-phase
Vector Group	Dyn11, Yyn0, etc.
Short-circuit Impedance	4.0% / 4.5% / 6.0% / 6.5% (varies by capacity range)
Cooling Method	ONAN (Oil-immersed natural cooling)
Insulation Class	Class A (Oil-immersed type)
Voltage Regulation Method	Off-circuit tap changing

Energy Efficiency and Loss Data

The following data is based on cores made of electrical steel strip and batch test results, complying with the energy efficiency limit values specified in GB 20052-2020. Specific loss parameters can be obtained from the technical department based on the capacity range, or estimated by referencing the energy efficiency data for products of the same capacity using planar stacked cores; the no-load loss of the 3D wound core structure is typically 10% to 20% lower.

Rated capacity KVA	Level 1						Level2						Level3						Short-circuit impedance%
	Electrical steel strip			Amorphous alloy			Electrical steel strip			Amorphous alloy			Electrical steel strip			Amorphous alloy
	No-load loss W	Load loss W		No-load loss W	Load loss W		No-load loss W	Load loss W		No-load loss W	Load lossW		No-load loss W	Load loss W		No-load loss W	Load loss W
	No-load loss W	Dyn11/Yzn1	Yyn0	No-load loss W	Dyn11/Yzn1 Yyn0		No-load loss W	Dyn11/Yzn1 Yyn0		No-load loss W	yn11/Yzn11	Yyn0	No-load loss W	Dyn11/ 1 Yyn0		No-load loss W	Dyn11/Yzn1	Yyn0
30	65	455	430	25	510	480	70	505	480	33	535	510	80	630	600	33	630	600	4.0
50	80	655	625	35	735	700	90	730	695	43	780	745	100	910	870	43	910	8700
63	90	785	745	40	880	840	100	870	830	50	930	890	110	1090	1040	50	1090	1040
80	105	945	900	50	1060	1010	115	1050	1000	60	1120	1070	130	1310	1250	60	1310	1250
100	120	1140	1080	60	1270	1215	135	1265	1200	75	1350		150	1580	1500	75	1580	1500
125	135	1360	1295	70	1530	1450	150	1510	1440	85	1615	1540	170	1890	1800	85	1890	1800
160	160	1665	1585	80	1870	1780	180	185C	1760	100	1970	1880	200	2310	2200	100	2310	2200
200	190	1970	1870	95	2210	2100	215	2185	2080	120	2330	2225	240	2730	2600	120	2730	2600
250	230	2300	2195	110	2590	2470	260	2560	2440	140	2735	2640	290	3200	3050	140	3200	3050
345	270	2760	2630	135	310C	2950	305	3065	2920	170	3275	3120	340	3830	3650	170	3830	3650
400	330	3250	3095	160	3660	3480	370	3615	3440	200	3865	3675	410	4520	4300	200	4520	4300
500	385	3900	3710	190	4380	4170	430	4330	4120	240	4625	4400	480	5410	5150	240	5410	5150
630	460	4460		250	5020		510	4960		320	5300		570	6200		20	6200		4.5
800	560	5400		300	6075		630	6000		380	5415		700	7500		380	7500
1000	665	7415		360	8340		845	8240		450	8800		830	10300		450	10300
1250	780	8640		425	9720		870	9600		530	10260		970	12000		530	12000
1600	940	10440		500	11745		050	11600		630	12400		1170	14500		630	14500
2000	1085	13180		550	14000		1225	4640		710	14800		360	18300		720	18300		5.0
2500	1280	13360		670	15450		1440	14840		860	16300		1600	21200					5.0

10kv Oil-Immersed Distribution Transformer With 3d Wound Core

FAQ

Q: Are there specific requirements regarding transport and installation orientation for 3D wound-core transformers?

A: Yes. The transformer body must remain upright during transport and installation; it should not be laid flat or tilted beyond specified angles. The tank base is designed to accommodate lifting and forklift operations; on-site positioning must follow the lifting instructions marked on the nameplate.

Q: How do the external dimensions compare to stacked-core products of the same capacity?

A: Typically, the volume is 10% to 15% smaller; while the height remains largely unchanged, the width and depth are slightly reduced. Please consult the specific model's outline drawing for exact dimensions, as the standard dimensions for stacked-core products cannot be directly applied.

Q: Does the annealing process affect the product's service life?

A: Annealing according to standard curves restores the magnetic properties of the silicon steel sheets to a stable state. Insufficient annealing leads to higher no-load losses, while excessive annealing may damage the insulation coating. At Yulan Transformer, winding and annealing processes are strictly controlled during mass production, with documented consistency.

Q: Can it be used in systems with high harmonic content?

A: The magnitude and order of harmonic currents on the load side must be evaluated. The 3D wound-core structure itself does not alter harmonic tolerance; if the harmonic distortion rate is high, please specify this when ordering so that winding design and temperature rise margins can be adjusted accordingly.

Q: Does this structure support on-load tap changing?

A: Yes, though the layout of tap leads and the internal tank space require redesign. Standard products feature off-circuit tap changing; versions with on-load tap changing have longer lead times.

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Contact Info

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Address

No. 20, Bai'e Road, Hecun Town, Jiangshan City, Zhejiang Province,CHINA
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Tel

+86-570-4721985
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Email

jsdlbyq@163.com

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