S11-M Series 20 kV Class Low-Loss Fully Sealed Power Transformer

Fully sealed power transformers eliminate the oil conservator and instead use the finned walls of the corrugated tank as heat‑dissipating cooling elements. As the transformer oil level rises or falls, the tank expands and contracts, isolating the interior from the atmosphere and preventing oil degradation, insulation moisture ingress, and aging, thereby enhancing operational reliability. The core is fabricated from high‑quality cold‑rolled silicon steel, which effectively improves the distribution of magnetic flux density within the core, reduces noise, and lowers losses. The windings are wound with high‑strength enameled wire (or paper‑wrapped wire), featuring a cylindrical (or disc‑type) construction with uniform ampere‑turn distribution and a well‑designed insulation system, providing excellent short‑circuit withstand capability. All fasteners inside the tank are equipped with locknuts to ensure they remain securely tightened during operation even after long‑distance transport. Following phosphating, the tank surface is coated with a three‑proof paint—resistant to moisture, mold, and salt spray—making it ideally suited for harsh operating environments such as metallurgy, mining, and petrochemical industries.

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Oil-Immersed Power Transformer Series

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Product Description

　　Overview

　　Fully sealed power transformers eliminate the oil conservator and instead use the finned walls of the corrugated tank as heat‑dissipating cooling elements. As the transformer oil level rises or falls, the tank expands and contracts, isolating the interior from the atmosphere and preventing oil degradation, moisture ingress, and insulation aging, thereby enhancing operational reliability. The core is fabricated from high‑quality cold‑rolled silicon steel sheets, which effectively improve the distribution of magnetic flux density within the core, reduce noise, and lower losses. The windings are wound with high‑strength enameled wire (or paper‑wrapped wire), featuring a cylindrical (or disc‑type) construction with uniform ampere‑turn distribution and a well‑designed insulation system, providing excellent short‑circuit withstand capability. All fasteners inside the tank are equipped with locknuts to ensure they remain securely tightened during operation even after long‑distance transport. Following phosphating, the tank surface is coated with a three‑proof paint—resistant to moisture, mold, and salt spray—making it ideally suited for harsh operating environments such as metallurgy, mining, and petrochemical industries.

　　Ordering Instructions

　　When placing your order, please provide the following parameters:

　　1. Product Model

　　2. Rated Capacity

　　3. Voltage Combination

　　4. Scope of Adjustment

　　5. Frequency

　　6. Connection Group Designation

　　7. Short-circuit impedance

　　8. For products with special requirements, specify the technical specifications.

　　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	20 ±2×2.5% or 22 ±2×2.5% or 24 ±2×2.5%	0.4	Yyn0 Dyn11	1.5	90	690/ 660	5.5	990	575	1080	200	130	520	400×400
50				1.3	130	1010/960		1060	600	1120	280	160	650	400×400
63				1.2	150	1200/1150		1080	610	1160	320	180	700	400×400
80				1.2	180	1440/1370		1120	620	1180	370	190	790	400×400
100				1.0	200	1730/1650		1130	625	1200	410	200	850	400×400
125				1.0	240	2080/1980		1150	640	1250	460	210	940	550×550
160				1.0	290	2540/2420		1320	770	1270	550	250	1100	550×550
200				1.0	330	3000/2860		1385	775	1355	650	315	1500	660×660
250				0.9	400	3520/3350		1415	785	1385	730	335	1580	660×660
315				0.9	480	4210/4010		1415	785	1435	810	350	1680	660×660
400				0.8	570	4970/4730		1445	795	1480	1000	400	1900	660×660
500				0.8	680	5940/5660		1490	810	1645	1190	450	2150	820×820
630				0.6	810	6820	6	1525	825	1680	1380	570	2350	820×820
800				0.6	980	8250		1795	1090	1050	1510	660	2605	820×820
1000				0.6	1150	11330		1780	1155	1110	1730	730	2900	820×820
1250				0.5	1350	13200		1765	1145	1485	1990	830	3425	820×820
1600				0.5	1630	15950		1770	1145	1720	2100	950	3920	820×820
2000				0.4	1950	19140		1770	1145	2180	2350	540	5010	1070×1070
2500				0.4	2340	22220		1780	1155	2795	2600	660	6160	1070×1070
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 those below the diagonal line apply to the Yyn0 connection group.