Yemen Dry-type power transformer

This series of dry-type transformers is designed for use in 6–35kV, three-phase AC power systems operating at 50Hz. The product has earned an independently developed invention patent for its low noise, energy-saving, and environmentally friendly features, making it widely applicable in applications such as transmission and distribution systems, hotels, high-rise buildings, commercial centers, sports venues, petrochemical plants, airports, railway stations, high-speed rail lines, subway systems, offshore drilling platforms—and especially in scenarios where installation space is limited, proximity to load centers is required, or special fire safety standards must be met. In these cases, the transformer’s compact size and excellent flame-retardant properties truly shine.

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YemenProduct Center

YemenResin-Insulated Dry-Type Power Transformer

Phone:020-39962088

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Product Description

Model Description

Implementation Standards

GB1094.11, GB6450, GB/T10228, IEC-726, DIN42526, and others

Rated High Voltage: 10 (11, 10.5, 10, 6.3, 6) kV

Connection group designation: Dyn11 or Yyn0

Rated low voltage: 0.4 kV

Insulation level: LI75AC35/AC5

Product Structure and Process Features

Our company introduced advanced European technology software in 2005, enabling us to optimize the design of dry-type transformers cast with epoxy resin using CAD. The transformer cores are crafted from high-quality, oriented cold-rolled silicon steel sheets, manufactured on a fully automated CNC stepped-joint core production line that employs a cutting-edge five-step lap-jointing process. This innovative technique significantly enhances the core's no-load performance. Meanwhile, the coils are made from Huntsman (formerly Ciba-Geigy) epoxy resin and are precisely cast under vacuum conditions, ensuring excellent resin penetration and eliminating air bubbles—resulting in remarkably low partial discharge levels. Additionally, the high- and low-voltage coils are tightly integrated, providing exceptional structural strength that ensures superior resistance to both short-circuit forces and mechanical vibrations. Under normal operating conditions, these transformers boast an impressive service life of up to 30 years. Throughout their operational lifespan, the product remains highly reliable, as temperature fluctuations will not cause surface cracking of the coils under typical usage conditions.

Product Structure:
Core: The dry-type transformer core is made from high-quality, grain-oriented cold-rolled silicon steel sheets, manufactured on a fully automated CNC stepped-joint core production line using an innovative stepped-joint technology. This advanced process optimizes the magnetic circuit structure and significantly reduces magnetic flux density at the stepped joints. Thanks to state-of-the-art equipment, premium-grade silicon steel sheets, and cutting-edge manufacturing techniques, the core now delivers dramatically improved no-load performance. Compared to conventional core designs, this results in a 5–6% reduction in no-load losses, a 20–30% decrease in no-load current, and a 6% drop in noise levels.
Coil: The dry-type transformer coils are high-voltage coils encapsulated with resin. The high-voltage coil features a segmented design, utilizing advanced Swiss Huntsman (formerly Ciba-Geigy) epoxy resin and precision vacuum casting equipment. The low-voltage coil adopts a foil-type construction. These cutting-edge manufacturing processes ensure the coils exhibit minimal partial discharge and exceptional resistance to short-circuit conditions. The high-voltage coil offers voltage regulation options: on-load tap-changing within ±5% of the rated voltage (Un) and ±2 × 2.5% of Un. Temperature control system: Equipped with functions such as fault alarms, over-temperature warnings, over-temperature trip protection, three-phase monitoring, and automatic start/stop control for the air-cooling system. Cooling system: Utilizing axial-flow fans, this system delivers quiet operation, uniform airflow distribution, and easy installation. Additionally, when equipped with extra fans, the unit can safely handle continuous overloads of up to approximately 40%.

Craft characteristics:
1. The noise source of the transformer originates from the iron core. Our company utilizes a fully automatic CNC stepped-joint iron core production line, employing the innovative Step-Lap technology to optimize the magnetic flux distribution within the core. Leveraging our unique equipment advantages, we’ve successfully reduced product noise levels.
2. Product design incorporates CAD optimization techniques and utilizes high-quality silicon steel sheets, carefully selecting a lower magnetic flux density to keep the system well away from saturation. This approach minimizes harmonic distortion in the iron core, significantly reducing noise levels.
3. All clamping areas are equipped with silicone rubber and elastic components for cushioning, which helps reduce vibration amplitude and minimize noise. Additionally, a layer of resin applied to the outer surface of the iron core provides effective sound insulation.
4. Featuring low partial discharge levels and high dielectric strength, the solid insulation composed of premium resin and glass fibers exhibits exceptional electrical performance—its breakdown voltage is no less than 34 kV/mm—while maintaining minimal partial discharge, which can be tightly controlled to ≤10 pC.
5. Flame-retardant and environmentally friendly: The resin and glass-fiber composite insulation materials used in dry-type transformers produce minimal heat during combustion—approximately 6.5 mJ/kg—giving them inherent flame-retardant and self-extinguishing properties.
6. Moisture-resistant: These transformers can operate safely even in 100% humidity environments. The iron core of the dry-type transformer is coated with resin, and the entire coil is encapsulated within this protective layer, ensuring reliable performance in air with up to 100% relative humidity while offering exceptional corrosion resistance. In addition to their moisture tolerance, dry-type transformers boast several other advantages, including strong overload capacity, excellent thermal stability, compact size, lightweight design, easy and convenient installation, and virtually maintenance-free operation. As a result, they are widely suitable for use in high-rise buildings, commercial centers, airports, railway stations, ports, subway systems, industrial facilities, and underground distribution substations.

Technical specifications:

1. Voltage level: 10 kV;
2. Voltage regulation method: No-load voltage regulation or on-load voltage regulation;
3. Tap range: ±5%, ±2 × 2.5%, or ±3 × 2.5%;
4. Capacity range: 30–25,000 kVA;
5. Frequency: 50Hz, 60Hz;
6. Single-phase, three-phase;
7. Connection group designation: Yyno or Dyn11 (or as per user requirements);
8. Short-circuit impedance: According to national standards or as per user requirements;
9. Operating environment: Relative humidity up to 100%, ambient temperature not exceeding 40°C (or as per user requirements);
10. Cooling method: AN or AF;
11. Protection ratings: IP00, IP20, IP23;
12. Insulation thermal rating: Class F;

13. Insulation Level: Power-frequency withstand voltage of 35 kV, impulse withstand voltage of 75 kV.

Product Outline Drawing

Performance parameters and external dimensions

Model	10 Series Models	SC(B)10	Pk (W)	Short-circuit impedance Uk (%)	Sound Pressure Level	A	b	c	d	cl	k	With a casing	Weight	Low-voltage terminal
Model	No-load loss \( P_o \) (W)	No-load current 1o(%)	Load loss: 120°C	Short-circuit impedance Uk (%)	LAP (DB)	A	b	c	d	cl	k	Length × Width × Height (mm)	kg	Low-voltage terminal
160	540	1.3	2130	4	50	1100	650	945	550	905	750	1400x1200x1300	705	(a)
200	620	1.3	2530		50	1100	650	1000	550	965	750	1250x1400x1350	790	(b)
250	720	1.3	2760		50	1150	760	1065	660	1030	800	1300x1450x1400	940	(b)
315	880	1.1	3470		50	1150	760	1090	660	1055	800	1300x1450x1450	1070	(b)
400	980	1.1	3990		50	1200	760	1215	660	1135	800	1500x1500x1550	1280	(b)
500	1160	1.1	4880		50	1200	760	1240	660	1210	800	1500x1500x1550	1440	(c)
630	13020	0.9	5960	6	50	1300	920	1210	820	1190	825	1600x1550x1550	1800	(d)
800	1520	0.9	6960		50	1450	920	1310	820	1295	850	1750x1650x1650	2150	(d)
1000	1770	0.9	8130		50	1490	920	1335	820	1315	900	1750x1650x1650	2500	(d)
1250	2090	0.9	9690		50	1530	920	1465	820	1410	900	1850x1700x1800	2910	(e)
1600	2450	0.9	11730		50	1590	1170	1525	820	1475	950	1900x1800x1850	3450	(e)
2000	3050	0.8	14450		50	1710	1170	1585	820	1535	950	2050x1800x1900	4110	(f)
2500	3600	0.8	17170		50	1780	1170	1700	1079	1650	1000	2100x1900x2100	4850	(f)

Any changes to the dimensions above will be subject to the actual product.

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No. 9 Qianfeng North Road, Shiji Town, Panyu District, Guangzhou City

Hotline: 020-39962088

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