SG(B)10 Series Non-Encapsulated Class H Dry-Type Power Transformer

The main insulation material of the SG(B)10 non‑encapsulated Class H dry‑type power transformer employs an insulation system based on DuPont Nomex® paper. Both the high‑ and low‑voltage windings are insulated with Nomex® paper and undergo vacuum pressure impregnation with a Class H solvent‑free insulating varnish, followed by high‑temperature curing. This process ensures that the transformer maintains excellent electrical and mechanical properties throughout its entire service life. Nomex® paper is resistant to aging, exhibits excellent dimensional stability under shrinkage and compression, and possesses superior elasticity, thereby guaranteeing that even after years of operation, the windings remain tightly structured and can withstand the mechanical forces generated during short circuits. The no‑load and load losses are 20% and 25% lower, respectively, than the limits specified in GB 10228‑1997, making this a low‑loss, low‑noise, environmentally friendly product. It is widely used in subways, high‑rise buildings, mines, airports, and other locations with high occupant density and stringent fire‑safety requirements, as well as in harsh environments characterized by high humidity, elevated temperatures, and significant load fluctuations.

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SG(B)10kV(H)-class series non‑encapsulated dry-type distribution transformer

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Product Description

　　Overview

　　The main insulation material of the SG(B)10 non‑encapsulated Class H dry‑type power transformer employs an insulation system based on DuPont Nomex® paper. Both the high‑ and low‑voltage windings are insulated with Nomex® paper and undergo vacuum pressure impregnation with a Class H solvent‑free insulating varnish, followed by high‑temperature curing. This process ensures that the transformer maintains excellent electrical and mechanical properties throughout its entire service life. Nomex® paper exhibits outstanding resistance to aging, shrinkage, and compression, while also possessing exceptional elasticity, thereby guaranteeing that even after several years of operation, the windings remain tightly structured and can withstand the mechanical forces generated during short circuits. The no‑load and load losses are 20% and 25% lower, respectively, than the requirements specified in GB 10228‑1997, making this a low‑loss, low‑noise, environmentally friendly product. It is widely used in subways, high‑rise buildings, mines, airports, and other locations with high population density and stringent fire‑safety standards, as well as in harsh environments characterized by high humidity, elevated temperatures, and significant load fluctuations.

　　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 Rated Power (KVA)	Rated current Rated Current (A)	Voltage combination Voltage Combution		Group Association Connection symbol	No-load current No-load Current (%)	No-load loss No-load Loos (W)	Load loss Load Loos(145℃) (W)	Impedance voltage Impedance Voltage UK(%)
Rated capacity Rated Power (KVA)	Rated current Rated Current (A)	High and low H.V.(KV)	Low pressure L.V.(KV)	Group Association Connection symbol	No-load current No-load Current (%)	No-load loss No-load Loos (W)	Load loss Load Loos(145℃) (W)	Impedance voltage Impedance Voltage UK(%)
100	5.77 144.3	6± ±2x2.5% 6.3± ±2x2.5% 10± ±2x2.5%	0.4	YynO Dyn11	1.6	400	1690	4
125	7.22 180.4				1.5	470	1980
160	9.24 230.9				1.4	540	2280
200	11.6 288.7				1.3	620	2710
250	14.43 360.8				1.2	720	2960
315	18.19 454.7				1.1	880	3730
400	23.09 577.4				1	980	4280
500	58.9 721.7				1	1160	5230
630	36.4 909				0.9	1340	6290
630	36.4 909				0.9	1300	6400	6
800	46.2 1154.7				0.8	1520	7460
1000	57.7 1443.4				0.7	1770	8760
1250	72.2 1804.3				0.6	2090	10370
1600	92.4 2309				0.6	2450	12580
2000	115.5 2886.7				0.6	3050	15560
2500	144.3 3608.4				0.5	3600	18450