S11-M·R Series 10 kV Class Wound-Core Power Transformer

The S11-M.R three-phase, fully sealed distribution transformer features a core manufactured by specialized winding equipment that continuously coils silicon steel strips into a closed, monolithic structure. This design eliminates the seams and air gaps typical of conventional cores, significantly reducing noise levels. Following annealing, the no-load losses are reduced by 30% compared to S9‑type models. The transformer employs a corrugated oil tank with a fully sealed construction, offering an attractive appearance, superior performance, and maintenance‑free operation, making it a next‑generation energy‑efficient and environmentally friendly product.

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Oil-Immersed Power Transformer Series

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Product Description

　　Overview

　　The S11-M.R three-phase, fully sealed distribution transformer features a core manufactured by specialized winding equipment that continuously coils silicon steel strips into a closed, monolithic structure. This design eliminates the seams and air gaps typical of conventional cores, significantly reducing noise levels. Following annealing treatment, the no-load losses are reduced by 30% compared to S9‑type models. The transformer employs a corrugated oil tank with a fully sealed construction, offering an attractive appearance, superior performance, and maintenance‑free operation, making it a next‑generation energy‑efficient and environmentally friendly product.

　　Product Features

　　1. The core is a seamless, non‑graded structure with an almost circular cross‑section, formed by winding silicon steel strip material. The yoke and core limbs are joined with rounded corners, and the core is of a closed configuration.

　　2. The high- and low-voltage windings are wound directly on the iron core, ensuring excellent concentricity between the two windings and superior short-circuit withstand capability.

　　3. Due to its unique core structure—formed by winding high‑quality, grain‑oriented cold‑rolled silicon steel sheets and subsequently annealed—the S11‑M.R transformer exhibits a 30% reduction in no‑load losses, a 70% reduction in no‑load current, and a noise level that is approximately 8 dB lower compared with an S9‑type transformer of the same capacity.

　　4. The oil conservator is eliminated, and a corrugated‑plate oil tank is adopted; temperature‑induced changes in oil volume are compensated by the elasticity of the corrugations, isolating the transformer oil from air and thereby extending its service life.

　　5. The corrugated oil tank features low temperature rise, a small footprint, and an aesthetically pleasing appearance.

　　6. All core‑processing operations have been fully mechanized, reducing labor intensity and improving product quality while ensuring consistent performance.

　　Technical Performance Parameters

Rated Capacity (kVA)	Rated voltage (kV)		Connection Group	No-load Electric current (%)	Loss (W)		Impedance Voltage (%)	Reference external dimensions (mm)			Reference weight (kg)			Track gauge Horizontal × Vertical (mm)
Rated Capacity (kVA)	High pressure	Low pressure	Connection Group	No-load Electric current (%)	No-load	Load	Impedance Voltage (%)	long	wide	High	Body of the vessel	Heavy oil	Total weight	Track gauge Horizontal × Vertical (mm)
30	6 ±2×2.5% or 6.3 ±2×2.5% or 10 ±2×2.5%	0.4	Yyn0 Dyn11	1.5	100	630/600	4.0	1010	620	960	145	77	295	400×400
50				1.3	130	910/870		1060	630	1000	224	90	420	400×400
63				1.2	150	1090/1040		1110	660	1080	240	95	460	400×400
80				1.2	180	1310/1250		1135	660	1040	328	98	530	400×400
100				1.0	200	1580/1500		1165	690	1085	325	125	575	400×400
125				1.0	240	1890/1800		1185	700	1170	390	165	680	550×550
160				1.0	280	2310/2200		1220	705	1190	499	147	840	550×550
200				1.0	340	2730/2600		1280	725	1240	592	179	960	550×550
250				0.9	400	3200/3050		1290	730	1260	724	191	1128	550×550
315				0.9	480	3830/3650		1320	740	1320	712	196	1145	550×550
400				0.8	570	4520/4300		1380	770	1380	953	237	1430	550×550
500				0.8	680	5410/5150		1450	810	1430	1120	264	1690	660×660
630				0.6	810	6200	4.5	1545	840	1445	1289	310	1960	660×660
800				0.6	980	7500		1670	920	1535	1430	355	2350	820×820
1000				0.6	1150	10300		1835	1090	1650	1796	450	2720	820×820
1250				0.5	1360	12000		1901	1190	1675	2080	570	3300	820×820
1600				0.5	1640	14500		1985	1210	1790	2300	645	3760	820×820
2000				0.4	1940	18300	5.0	2140	1260	1910	3130	765	5145	820×820
2500				0.4	2290	21200	5.0	2525	1480	2540	4198	925	6420	820×820
Note: For three-phase transformers with a rated capacity of 500 kVA or less, the load loss values above the diagonal line in the table apply to the Dyn11 connection group, while the values below the diagonal line apply to other connection groups. Applicable to the Yyn0 connection group