S20 Energy‑Saving Oil‑Immersed Distribution Transformer

Features :
✅Ultra‑low loss energy‑saving design, S20 high‑efficiency grade
✅Fully sealed corrugated tank, maintenance‑free operation
✅Customizable capacity & voltage for distribution network
✅ On‑board voltage adjustment tap changer
✅Stainless steel hardware for long‑term outdoor service
✅High‑permeability cold‑rolled silicon‑steel core
✅Copper or aluminum windings optional
✅ Low noise, low partial discharge, high efficiency & reliability
✅Compliant with IEC and GB standards

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Main Overview：

The S20 series is high‑grade energy‑saving fully‑sealed oil‑immersed distribution transformer, further upgraded on the basis of S13 series.

Adopting high‑permeability cold‑rolled silicon‑steel sheet and optimized core‑coil structure, it delivers prominent reduction on no‑load loss and operating noise.

Corrugated tank integrates cooling, breathing and volume expansion functions, equipped with pressure‑release valve to isolate outside air and prevent oil degradation, realizing maintenance‑free performance. Vacuum‑annealed epoxy‑cured core guarantees stable performance, with service life up to 30 years. Widely adopted for power grid, new‑energy and industrial distribution projects.

Meaning of Model Number：

Meaning of Model Number	S	M	(B)	20	-	□	/	□	-	NX2
	Three-phase	Fully sealed	For capacity of 400kVA and above, low-voltage foil wound coils can be used.	Performance level code		Rated capacity kVA		Voltage class kV		Energy efficiency class

Performance parameters of S20-type 10kV series products:

Model	Rated capacity （kVA）	Vector group	Voltage combination（kV）			No-load loss （W）	Dy Load loss（W）75℃ （A）	No-load current （%）	Impedance voltage （%）
Model	Rated capacity （kVA）	Vector group	High voltage	Tapping range	Low voltage	No-load loss （W）	Dy Load loss（W）75℃ （A）	No-load current （%）	Impedance voltage （%）
S20-M-30	30	Dyn11	10	±2x2.5%	0.4	70	505	1.2	4
S20-M-50	50					90	730	1.04
S20-M-63	63					100	870	0.96
S20-M-80	80					115	1050	0.96
S20-M-100	100					135	1265	0.88
S20-M-125	125					150	1510	0.88
S20-M-160	160					180	1850	0.8
S20-M-200	200					215	2185	0.8
S20-M-250	250					260	2560	0.72
S20-M-315	315					305	3065	0.72
S20-M-400	400					370	3615	0.64
S20-M-500	500					430	4330	0.64
S20-M-630	630					510	4960	0.48	4.5
S20-M-800	800					630	6000	0.48
S20-M-1000	1000					745	8240	0.48
S20-M-1250	1250					870	9600	0.4
S20-M-1600	1600					1050	11600	0.4
S20-M-2000	2000					1225	14640	0.32	5
S20-M-2500	2500					1440	16960	0.32	5

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