Dry-Type Transformer

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SGB Series Three-Phase Non Encapsulated Dry-Type T01.jpg

SGB Series Three-Phase Non Encapsulated Dry-Type T02.jpg

SGB Series Three-Phase Non Encapsulated Dry-Type T03.jpg

SGB Series Three-Phase Non Encapsulated Dry-Type Transformer

SGB11/12/13/14/18 Series

Product Overview
The SGB non-encapsulated dry-type transformer leverages NOMEX® insulation technology to deliver exceptional operational safety and reliability. Its innovative open-ventilated design achieves superior energy efficiency while inherently eliminating fire and explosion hazards, significantly reducing long-term maintenance requirements. Engineered with precision-balanced electromagnetic structures and corrosion-resistant components, the unit demonstrates exceptional robustness in challenging environments.
Performance validation confirms key metrics surpass domestic standards, with optimized thermal management systems enabling stable operation in tropical climates exceeding 95% humidity. The transformer’s modular construction facilitates swift on-site servicing, further reinforcing lifecycle cost advantages. These technical attributes make it the preferred solution for critical installations including offshore platforms, chemical processing plants, and high-rise commercial complexes where uncompromising fire safety and moisture resistance are paramount.

product details

Model Definition

Features

● Voltage level: 10~35/0.4kV.

● Capacity: 30~3150kVA.

● Core Technology:

Employs high-permeability laminated silicon steel cores with optimized stacking factor and step-lap joint design to eliminate third-harmonic flux paths. This advanced magnetic circuit configuration minimizes core losses and delivers substantial energy savings across varying load profiles.

● Insulation System:

Features an H-class insulation system reinforced with C-class NOMEX® aramid paper as the primary dielectric barrier. This dual-rated insulation structure provides exceptional thermal stability, chemical resistance, and dielectric strength under extreme operating conditions.

● Winding Design:

High-voltage pancake windings with interleaved layers and low-voltage foil conductors with uniform current density distribution ensure low leakage reactance and enhanced short-circuit withstand capability. The compact, rigid structure minimizes mechanical stresses during fault conditions.

● Thermal & Mechanical Performance:

Integrates low-loss materials and an optimized cooling path to minimize heat generation, while the finned radiator design facilitates efficient natural convection cooling. The high-temperature insulation system supports continuous operation at elevated loads without compromising safety margins.

● Manufacturing Process:

Undergoes a precision-controlled secondary vacuum pressure impregnation (VPI) process, which fully encapsulates the core and windings in a moisture-resistant epoxy resin matrix. This treatment ensures long-term protection against environmental contaminants and reduces partial discharge activity to negligible levels.

● Environmental Friendliness:

Designed for end-of-life disassembly and material recovery, with separable components and recyclable materials throughout. The transformer utilizes non-toxic, non-hazardous materials that comply with global environmental standards, supporting sustainable lifecycle management practices.

Range of application

High-rise buildings, densely populated residential areas, key government institutions, airports, subways, railway stations, ports, petrochemical plants, metallurgical and mining sites, nuclear power plants, nuclear submarines, light rail systems, power plants, and locations requiring fire and explosion protection.

Technical specifications

Rated capacity (kVA)	Rated voltage			Vector group	No-load loss (W)						Load loss (W)				No-load current (%)	Impedance voltage (%)
	HV (kV)	Tapping range (%)	LV (kV)		No-load loss (W)						11#	12#	13,14#	18#
	HV (kV)	Tapping range (%)	LV (kV)		10#	11#	12#	13#	14#	18#	120℃	120℃	120℃	145℃
100	6 6.3 6.6 10 10.5 11	±5 Or ±2 X 2.5	0.4	Dyn11 or Yyn0	400	360	320	290	270	230	1570	1415	1520	0.7	4	4
125					470	420	375	340	320	270	1850	1665	1780	0.7
160					540	480	430	385	365	310	2130	1915	2050	0.7
200					620	550	495	445	420	360	2530	2275	2440	0.6
250					720	640	575	515	490	415	2760	2485	2665	0.5
315					880	790	705	635	600	510	3470	3125	3355	0.5
400					980	880	785	705	665	570	3990	3590	3850	0.5
500					1160	1040	930	835	791	670	4880	4390	4705	0.4
630					1340	1200	1070	965	910	775	5880	5290	5660	0.4
630					1300	1170	1040	935	885	750	5960	5365	5760	0.35	6	6
800					1520	1360	1215	1095	1035	875	6960	6265	6715	0.35
1000					1770	1590	1415	1275	1205	1020	8130	7315	7885	0.3
1250					2090	1880	1670	1505	1420	1205	9690	8720	9335	0.3
1600					2450	2200	1960	1765	1665	1415	11730	10555	11320	0.25
2000					3050	2740	2440	2195	2075	1760	14450	13005	14005	0.2
2500					3600	3240	2880	2590	2450	2080	17170	15445	16605	0.2
1600					2450	2200		1765			12960	11660		0.2	8	8
2000					3050	2740		2195			15960	14360		0.2
2500					3600	3240		2590			18890	17000		0.2

Note: The above data is subject to change due to technical improvement.