121kv/50000 kVA Oltc Power Transformer (SZ11)

Basic Info.

Model NO.	SZ11
Usage	Power Transformer
Frequency Characteristics	High Frequency
Shape of Core	U
Brand	Eacher/Shenda
Coil Number	Three-Phase Two-Winding
Certificates	Ctqc, CE, ISO9001, ISO14001, Cesi
Coil Structure	Toroidal
Transport Package	Export Worthy Packing
Specification	CTQC, ISO9001, ISO14001, CE, IEC, GB, ANSI
Trademark	EACHER
Origin	Jiangshan, Zhejiang, China
Production Capacity	1000 Per Year

Product Description

Specifications
1) CTQC, ISO9001, ISO14001, CE
2) Apply for IEC, GB, ANSI
3) Up to 230kV, 180MVA
4) Low losses
220 110 66 kv series power transformer
High voltage power transformer ratio range from 66KV to 220KV are the main products of SHENDA Electric which have many advantage both on quality and price.All the products has been fully tested and certificated before delivery.
Plenty of our products have been exported and applied in oversea markets regarding power plant, substation, mineral and ore industries.
Shenda electric is renowned and appreciated by its reliable products performance and integrated services.
Features:
1) Amount of local discharged:The apparent discharge amount is less than 80PC under 1.5 times of rated voltage;
2) Noise:Products of 63MVA and below is lower than 58 dB (AN);
3) Power loss:No-load loss is 30% lower than that of IEC standard;
4) Reliability:All in-service products have no damages or oil leakage occurred;
Application:
60 ~220 kV power system of power plant, substation, mining enterprise and etc.
Technologies:
Design:Relative developed software are adopted in Electromagnetic calculations, strength analysis, leakage magnetic distribution, its electro-dynamic force and electrical insulation.
Manufacture:
Core:Effectively upgrade transformer's no-load performance by below methods:
1) The core is made of high-permeable grain-orientated top quality cold-rolled silicon sheet and the material is cut with advanced Germany Geoge GmbH automatic shear line with the cut burs controlled within 0.02mm.
2) The silicon sheet fabrication adopts "no-upper yoke lapped' technology and all lapped joints of the silicon sheet are 45 full-miters.The laminated core sheets are integrally pressed and adhered with epoxy resin to make the three leg two-yoke core a strong and flat integral one with good verticality precision, this effectively improves no-load performance and reduces noises.
3) Bracing plates are used as support between coil leg and inner coil.The iron yoke is tied with epoxy resin-impregnated glass fiber band, and the lower section of oil tank is tightened with counter-pressure bolts.The upper iron and the upper section of oil tank are fixed at three locations.Hence the body inside the oil tank can withstand the vibration during transportation without any shift.
Winding:
1) The high-voltage (HV) coil adopts an interleaved-continuous structure to improve the voltage characteristics under impact voltage and make voltage evenly distributed.All stays and pads are chamfered to keep highly reliable insulation.
2) In the transformer winding there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot points of the winding and prolong the service life of insulation.The HV and MV regulation system are independently provided with voltage-regulating winding to balance the ampere turn of each winding, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt short-circuit withstanding capacity.
3) The winding adopts radial "0" margin designed, between the core and the paper sleeve of LV winding, and between the LV, HV, voltage-regulating windings, as well as before insertion of stays and shroud plate they are fully dried and tightly matched to ensure extremely good compactness and concentricity of the entire winding.
Oil tank and accessories
1) The tank wall adopts wide steel sheet, which will be folded into corrugated structure without splicing, in this way welds are decreased and mechanical strength is enhanced, meanwhile, the corrugated wall has diverging effect, and thus plays a role in decrease of noise.The routing troughs and control cabinets of the secondary circuit are all made of stainless steel, so the entire transformer has a simple and good looking.
2) All sealing surface use quality sealing material and are precision-machined.

Rated power (kVA)	H.V (kV)	H.V. Tap range	L.V (kV)	Vector Group	Impedance (%)	No-load Loss (kW)	On-load Loss (kW)	No-load Current (%)	Oil Weight (kg)	Total weight (kg)	Overall dimension (mm)
800	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	6.5	1.06	9.98	1.05	1650	4790	2870*1810*2570
1000	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	6.5	1.26	12.16	1	1760	5210	3150*1890*2650
1250	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	6.5	1.49	14.63	0.9	2010	6080	3510*2040*2690
1600	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	6.5	1.8	17.58	0.85	1920	6610	3560*2070*2740
2000	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	6.5	2.3	19.24	0.8	2160	7440	3680*2050*2850
2500	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	6.5	2.72	20.64	0.8	2580	8240	3780*2220*2890
3150	35/38.5	±3*2.5%	6.3	Yd11 or YNd11	7	3.23	24.71	0.72	2680	8540	3850*2310*2950
4000	35/38.5	±3*2.5%	6.6	Yd11 or YNd11	7	3.87	29.16	0.72	2960	11180	4120*2380*3150
5000	35/38.5	±3*2.5%	10	Yd11 or YNd11	7	4.64	34.2	0.68	3050	12480	4210*2510*3220
6300	35/38.5	±3*2.5%	10.5	Yd11 or YNd11	7.5	5.63	36.77	0.68	4050	15900	4320*3000*3290
8000	35/38.5	±3*2.5%	11	Yd11 or YNd11	7.5	7.87	40.61	0.6	4200	17130	4500*3100*3680
10000	35/38.5	±3*2.5%	11	Yd11 or YNd11	7.5	9.28	48.05	0.6	7480	25230	4560*3500*3750
12500	35/38.5	±3*2.5%	11	Yd11 or YNd11	8	10.94	56.86	0.56	8010	27000	4590*3580*3830
16000	35/38.5	±3*2.5%	11	Yd11 or YNd11	8	13.17	70.32	0.54	8560	32500	4650*3700*4000
20000	35/38.5	±3*2.5%	11	Yd11 or YNd11	8	15.57	82.78	0.54	10030	37770	5200*4200*4280
25000	35/38.5	±3*2.5%	11	Yd11 or YNd11	8	18.96	101.65	0.5	12300	42600	5320*4350*4340
31500	35/38.5	±3*2.5%	11	Yd11 or YNd11	8	22	119.7	0.45	13500	51100	5450*4420*4450
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Certifications

Certificates owned by shenda:
100MVA/220kv power transformer short circuit test report
-issued by CESI Italy&CTQC China
120MVA/33KV oil EAF transformer
50MVA/69KV oil power transformer
10MVA/33kv dry-type transformer
Type test report
-issued by KEMA Netherlands
63MVA/110KV Power transformer short circuit test report
-issued by CTQC China
12.5MVA/22KV Rectifier transformer routine test
-issued by V-Check korea
ISO 9001&ISO14001&OHSAS 18001
CE-POWER TRANSFORMER&FURNACE TRANSFORMER&DRY-TYPE TRANSFORMER&REACTOR
Transformer Characteristics

Winding .
The winding must be especially protected - both against high electrical stress due to
external over voltages and against mechanical overloads by short circuits. They are made of copper or aluminum. Low-voltage windings are made of strip or flat wire while
high voltage windings are manufactured from round or profile wire. ("diamond-dotted paper") bonds the winding into a compact block
while drying and increases the short-circuit capacity additionally.

Magnetic Core lamination.
The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel lamination insulated on both sides,
guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a
flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.

Oil tank.
Whether during transport or operation -the tank must be absolutely tight under mechanical stress. We have vast constructional experience, the most modern calculation methods and high-quality welding work. Special attention is paid to
corrosion protection. Pretreatment of the surface is processed by phosphating pickling, contributes to corrosion protection, just
like multi-coating with preset drying times for each layer. On request, hot-dip galvanization provides for even better protection

Test lab
Testing are conducted for every transformer before delivery.Tests are classified to be routine tests and type test.
A - Routine tests: According to IEC 60076 standard , the following tests must be carried out for all units of the transformers
a- Measurement of winding resistance .
b- Measurement of voltage ratio and check of phase displacement.
c- Measurement of short circuit impedance and load losses.
d-Measurement of no-load losses and current .
e-Dielectric routine tests including the separate source AC voltage withstanding test and short duration induced over voltage withstanding test ( ACSD ) .
B - Type tests :
The following tests shall be carried out
a- Temperature rise test
b- Lightning impulse test
C - Special tests :
a- Determination of noise level according to IEC 60551 .
b- Oil leakage test
c- Overload test at 150 % rated current for one hour after temperature rise test ( top oil temperature rise and winding temperature rise must be measured and recorded in the report test also hot spot temperature rise must be calculated and recorded on the report test ) .
d- Short Circuit Dynamic stability Test (test report from independent and accredited laboratory for similar transformer will be accepted).
Packaging and transportation

Company Introduction
SHENDA electric group is a manufacturer and wholesale company that manufactures good & high quality electric transformers from 2000. The company provides the customized products and OEM service. The factory own the 3 production base worldwide,2 in China and 1 in USA.We also own a transformer research institute with more than 30 electric engineers .

Our Services
1. Pre-Sale Service
- Quick response: reply you within 8 hours, to save your time.
- Professional solution: supply professional completed solution base on your technical requirements, to complete your technical plan.
- Quoataion: submit a competive price within 2 days, to promote your business
2. In Sale Service
- Supplying stipulated completed drawings
- Supplying manufacturing plan and processing photos
- Making the test plan and book hotel for the witness person
- Making good arrangement of the delivery and shipment
3. Afer Sale Service
- Supplying professional supervision and commissioning within 15 days
- Training the workers
- Providing 12 months waranty of quality and perforance

RFQ

1,Q:	Are you manufacturer?
A:	Yes, we are manufacturer. Our factory is in JiangShan City, zhejiang Province.
2,Q:	What is your delivery time ?
A:	Depend on the type of transformer.
3,Q:	What is your payment term?
A:	30% advance by T/T , 70% before delivery by T/T or L/C or we can discuss about it.
4,Q:	Are your transformers supported for customization ?
A:	Yes, of course. We can design and produce accroding to the technical requirements and parameters of customers.
5,Q:	Do you offer guarantee for the products?
A:	Yes. Different transformers is different. We offer at least one year guarantee for all of our transformers.
6,Q:	Do you accept Factory Acceptance Test?
A:	Yes. It's available. And we are responsible for each set transformer's testing (ICE).
7,Q:	Do you assign engineer for after-sale service?
A:	Yes. For our products,we all provide after-sale installation instructions service