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Dry-type transformer

Class-H insulating impregnated dry-type transformers

Overview

This series of products have NOMEX insulation system of DuPont Company, whose thermal rating is H. It is characterized by safety, reliability, energy conservation, environmental protection, fire and explosion prevention and simple maintenance. Its partial discharge, loss, noise and other performance indicators are superior to domestic standards. It is applicable to installation at humid environment and places with high fire prevention and large load requirements.

Execution standard
Model
Performance
Parameters
Appearance

- GB/T 17211-1998 《Load Guidance of Dry Power Transformer》
- IEC 60076-11：2004 《Dry Power Transformer》
- GB 1094. 11-2007 《Dry Power Transformer》
- GB/T 10228-2008 《Technical Parameters and Reqirements of Dry Power Transformer》
SG(B)9、10-100~2500/10、20
Structural features
- The unique insulation structure is made of Level H high strength insulation cylinder and cushion block without deformation.
- High/low-voltage coil is made of NOMEX paper enwrapped with flat copper wire and imported copper foil; it is immersed into Level H insulation paint with special ingredient in VPI vacuum pressure booster and is baked and consolidated for numerous times. The high-voltage coil is in the continuous structure with high mechanical strength and excellent heat radiation conditions.
- The terminal of lead-out wire is fixed in the upper part of winding; branch joint is fixed in the middle of winding; low-voltage lead terminal belongs to board type conductive busbar which is welded by argon arc.
- The iron core is overlapped by high-quality imported cold rolling grain-oriented electrical steel; it is in 45 ° inclined jointing structure; the flexible fixation unit is collocated between the winding and iron core so that transformer enjoys a rather low idling consumption and noise.
- The surface of iron core is treated by a special process. The iron core is clamped by pull screw rod properly; the upper and lower clamping components are connected by the pull board and fixed with base as a whole; the winding is fixed by flexible cushion block; the buffer structure can alleviate the winding vibration and reduce noise.
Peformance
- Good heat dissipation, long service life, strong operation capacity exceeding the nameplate rating, long-term operation exceeding the nameplate rating at 120% rated capacity. IP45 can operate in a long term under full load in condition of forced air cooling;
- Extremely high safety and fire resistance, without smoke when burning for a long period under 800℃ ;
- Extremely strong thermal shock resistance (full load immediately under -50℃ );
- 100% watertight sealing, excellent water resistance and moisture resistance;
- Unique coil structure and intense field calculation to allow the product nearly to be free from partial discharge;
- Low loss and significant energy-saving effect;
- After service life, the insulating materials and copper wires can be separated easily for recycling and without environmental pollution.
Main structural features
- Maximum temperature: +40℃
- Maximum average daily temperature: +30℃
- Maximum average annual temperature: +20℃
- Minimum temperature: -5℃ (applicable to indoor transformer)
- Minimum temperature: -30℃ (applicable to outdoor transformer)
- Altitude: ≤ 1000m

Technical parameters of SG(B)9/10 series of immersion Level H insulation transformer
Rated volume (kVA)	Voltage combination			Conn. Symb	No-load loss (W)	On-load loss under different insulation heat resistance grades F(120℃)	Excit Curr. (%)	Impedance (%)
Rated volume (kVA)	High voltage (kV)	Tap change scope (%)	Low voltage (kV)	Conn. Symb	No-load loss (W)		Excit Curr. (%)	Impedance (%)
100	6 6.3 6.6 10 10.5 11	±5 or ±2×2.5	0.4	Yyn0 or Dyn11	450	1780	1.8	4
125					530	2100	1.6
160					610	2410	1.6
200					700	2870	1.4
250					810	3120	1.4
315					990	3930	1.2
400					1100	4520	1.2
500					1310	5530	1.2
630					1510	6660	1.0
630					1460	6750	1.0	6
800					1710	7880	1.0
1000					1990	9210	1.0
1250					2350	10980	1.0
1600					2760	13270	1.0
2000					3400	16370	0.8
2500					4000	19460	0.8
1600					2760	14660	1.0	8
2000					3400	18000	0.8
2500					4000	21400	0.8

Technical parameters of SG(B)10/10 series of immersion Level H insulation transformer
Rated volume (kVA)	Voltage combination			Conn. Symb	No-load loss (W)	On-load loss under different insulation heat resistance grades F(120℃)	Excit Curr. (%)	Impedance (%)
Rated volume (kVA)	High voltage (kV)	Tap change scope (%)	Low voltage (kV)	Conn. Symb	No-load loss (W)		Excit Curr. (%)	Impedance (%)
100	20 22 24 3 3 3	±5 or ±2×2.5	0.4	Yyn0 or Dyn11	405	1690	1.8	4
125					475	1995	1.6
160					550	2290	1.6
200					630	2725	1.4
250					730	2965	1.4
315					890	3735	1.2
400					990	4295	1.2
500					1180	5255	1.2
630					1360	6330	1.0
630					1315	6415	1.0	6
800					1540	7485	1.0
1000					1790	8750	1.0
1250					2115	10430	1.0
1600					2485	12605	1.0
2000					3060	15550	0.8
2500					3600	18490	0.8
1600					2485	13930	1.0	8
2000					3060	17100	0.8
2500					3600	20330	0.8

Technical parameters of SG(B)10/20 series of immersion Level H insulation transformer
Rated volume (kVA)	Voltage combination			Conn. Symb	No-load loss (W)	On-load loss under different insulation heat resistance grades F(120℃)	Excit Curr. (%)	Impedance (%)
Rated volume (kVA)	High voltage (kV)	Tap change scope (%)	Low voltage (kV)	Conn. Symb	No-load loss (W)		Excit Curr. (%)	Impedance (%)
315	20	±5 or ±2×2.5	0.4	Yyn0 or Dyn11	0.960	4.345	0.7	6
400					1.140	5.160	0.6
500					1.330	6.165	0.6
630					1.510	7.275	0.5
800					1.730	8.795	0.5
1000					2.040	10.410	0.5
1250					2.360	12.285	0.5
1600					2.760	14.755	0.5
2000					3.200	17.420	0.5
2500					3.820	20.620	0.4
3150					4.300	25.265	0.4	7

Schematic diagram of appearance and installation of SG (B) series of body

Schematic diagram of appearance of installation of SG (B) series of crust

No.218, Wusong Road, Shanghai, China [sales headquarters] 200080 400-080-1921
F12, Shanghai Baokuang International BM Building
Address: No.666, Zhangwengmiao Road, Fengxian District, Shanghai Postal code:201400
Switchboard: 86-21-68866111 Fax:86-21-68860333
©2013 Shanghai Transformer Work Co., Ltd.

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