110kV Class Power Transformers
General
The110kV class low loss transformers are developed by Huapengour workshop through years of service experience and careful analysis of the advantages and disadvantages of the transformers of different manufacturers, both domestic and abroad, and are featured by low loss, low partial discharge, low noise, high strength against short circuit, and high reliability in service. Its outstanding performance has won high reputation throughout China, and the world, and are highly appreciated by experts of the circle. Transformers can be made with welded tank cover and/or flange , Thus obviated from the necessity of lifting out the active part for inspection after arrival on site.
Partial discharge level:
apparent discharge < 80pC at 1.5 times rated voltage.
Noise level :
below 58 dB for transformers 63MVA and below with AN cooling
Losses:
no-load loss 30% lower than specified by GB/T 6451-1995
Reliability:
no damage or oil leakage have been found in transformers in service up to the present
Short-circuit withstand capability:
Our SZ9-31500/110,SSZ-50000/110 transformers successfully passed short-circuit test in National Transformer Quality Inspecting and Testing Center, and in CESI Laboratory of Italy.
Winding
1. Partially interleaved continuous winding is used for HV winding to improve its behavior under lightning impulse, because of its more uniform voltage distribution.
2. All the spacers and vertical strips are rounded at corners, in order to obtain a more reliable insulation structure.
3. Zig-Zag directional flow is provided inside the windings, so that all parts of the windings are better cooled, resulting in lower winding temperature rise, and specifically lower hot-spot temperature, thus the insulation life of the transformer is prolonged.
4. Separate regulating windings are provided for both the 110kV high voltage and the 35kV medium voltage side, so that a more balanced ampere-turn is obtained in spite of tap-changing, the short-circuit withstand capability is thus promoted. Radially, the windings of a phase assembly are tight-fit, little space is left between the core and the low-voltage cylinder, and between the windings. All the vertical strips and cylinders are thoroughly dried before assembly, so that a tight phase assembly can be finally obtained.
Core
1. High permeability grain oriented high quality cold-rolled sheets are used for the fabrication of core. The sheets are cut on automatic cutting line made by Georg Co. of Germany or Soenen Co. of Belgium. The burrs are controlled within 0.02mm.
2. The core is stacked without stacking the upper yoke, the upper yoke sheets are placed into position after the winding blocks are mounted on the core. The joints of the core sheets are mitred 45fpjoint with step-lap. The stacked core is pressed under even pressure and the edge of the sheets are painted with epoxy resin, so that a straight, robust, integral structure is obtained, helping to reduce core loss and noise.
3. Wooden strips are driven into the space between core and LV cylinder. The yoke is kept tightened by epoxy-resin impregnated glass tape, while the lower yoke is pressed against the wall of the lower tank through threaded bolts. The active part of the transformer is in addition kept in position by devices at three places between the upper yoke and the tank cover in such a way that the active part cannot be displaced during transportation.
Transformer
Grade-h insulation amorphous alloy transformer
10kv-35kv 30kva-2500kva
This product is another novelty developed by employing proven techniques from both both united state and china on the basis of our company's successful production of model sg10 grade-h insulation unrestricted venting dry-type transformer. It lowers the no-load loss and open-circuit loss intensively, and is of superior performance, thus it is currently the state-of-the-art dry-type transformer in the world. This product is safe, reliable, environment friendly and energy saving, and can go deep into the load center and is applicable to modern city's high-density and heavy-load developmental needs.
Transformer
Grade-h insulation amorphous alloy transformer
10kv-35kv 30kva-2500kva
This product is another novelty developed by employing proven techniques from both both united state and china on the basis of our company's successful production of model sg10 grade-h insulation unrestricted venting dry-type transformer. It lowers the no-load loss and open-circuit loss intensively, and is of superior performance, thus it is currently the state-of-the-art dry-type transformer in the world. This product is safe, reliable, environment friendly and energy saving, and can go deep into the load center and is applicable to modern city's high-density and heavy-load developmental needs.
High temperature resistant liquid-immersed transformer
10kv 30kva-3150kva
35kv 50kva-31500kva
Load tap switching transformer
Standard JEC-220-2014
Phase number 3
Rated frequency 50Hz
Cooling method ONAN / ONAF
Rated Capacity (KVA) Primary 20000/22000 Secondary 20000/22000
Rated voltage (V) primary 66000 secondary 6600
Rated current (A) primary 175/192 secondary 1750/1925
Test voltage value (KV) primary L1 350 AC 140 secondary L1 60 AC22
Temperature rise limit
Number of turns 65K Oil 60K
23T each in weight
A transformer is an electrical device which is used to transfer power from one circuit to another through electromagnetic induction. The power transfer is accompanied without frequency change. In an electronic system, the term power transformer is used to provide a number of AC supplies of several voltages and appropriate values of current from the public electricity supply.
Tungwell oil immersed transformers are up to 750kV, 1500MVA and cast resindry type transformers are up to 110kV, 40MVA. Our design team has very strong design capabilities and uses a variety of design software including 2D and 3D electrical field FEM and Magnetic flux leakage calculators. The resulting products come with many advanced features such as low loss design, short circuit withstand assurance, reliable extra-high voltage protection with overheating controls.
The range of small power transformers can be from500-7500kVA
The range of medium power transformers can be from-100MVA
The range of large power transformers can be from100MVA & beyond
The test transformer calls the booster, it is the basic test equipment used by the power station, supplying and distributing the electrical power system and the scientific research unit. Which used in the insulated intension test on all kinds of electrical products, electrical equipments and insulated materials, testing the insulated level of products, discovering the insulated objection of quizzee, scaling the capacity burdened voltage
Oil Immersed Testing Transformer 1
Technical index
Model
Capacity
High Frequency Voltage Output Voltage
High Frequency Voltage Output Current )
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4. Low-loss, with Aluminum or Copper winding.
5. Electrostatic shield between LV and MV Winding.
6. Fully type tested at internationally recognized laboratory.
7. Designed with high efficiency, environmental friendliness, superior operational reliability and minimal Total Cost of Ownership.
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It is compliant to IEEE 802.3 , UL, Reach, RoHs, ISO19001,ISO14001 standards.It can be used to Industrial PC, New Energy, Network Firewall, Smart Meters.
Built-in protection system, supporting intelligent protection such as overcurrent, overvoltage, short circuit, temperature, etc.
Safety technology, escort your equipment
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The test transformer calls the booster, it is the basic test equipment used by the power station, supplying and distributing the electrical power system and the scientific research unit. Which used in the insulated intension test on all kinds of electrical products, electrical equipments and insulated materials, testing the insulated level of products, discovering the insulated objection of quizzee, scaling the capacity burdened voltage
Our products got certificate of ISO9001,ISO14001 and OHSAS18001. And 18 low voltage products get national certificate of CCC. Also our products get quality testing report from China Quality Certification Center(CQC). Our customers include urban distribution network, power station, transformer substation, oil, chemical, railway and big construction companies. And products export to America, Brazil, Peru, Kenya, Ethiopia, India, Myanmar, Vietnam etc. We sincerely welcome all friends from domestic and overseas to come to cooperate and develop together.
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