It is based upon advanced technologies introduced from abroad and the successful experiences of leading manufacturers both domestic and abroad. It conforms entirely with up-to-date National Standard GB1094.1~2-1996¡ê¬GB1094.3-2003 GB1094.5-2003 and International Standard IEC76 commended by international electrical engin- eering committee, and are proud of the following outstanding features:
1. Low loss, and significantly energy-saving. The average no-load loss is 35% lower than prescribed by National Standard GB/T 6451-2008.
2. The core laminations are made up from high-quality cold-rolled grain-oriented silicon steel sheets with chamfered joints and without punched holes, and are stacked without the upper yoke sheets in place, so that they are effectively improved no-load upper together with lower frame.
3. Zigzag directed flow of oil are provided within the windings, so that all parts of the windings can be cooled more evenly.
4. The regulating winding is a separate winding which apart from the high voltage main winding. In this way, total ampere-turn balance between windings ; and the axial electrodynamic force during short circuit can be reduced, thus upgrading the short circuit withstand capability of the transformer as a whole.
5. The windings of one phase are assembled into an integral phase block before placing into the core.
6. The winding manufacture, winding assembly core and winding assembly work are all proceed in totally closed clean department.
7. Core frames in the form of a flat plate are used for clamping the core, and are joined together by side beams. The core and coil assembly is fixed in the tank, being positioned against the tank at six sides rigidly, so that there can be no displacement of the assembly due to impacts during transport.
8. Transformer tanks are fabricated with steel plates wide enough so that there are no weld joints on each surface. The steel plates for tank walls are pressed into corrugated shape to increase mechanical strength and to reduce noise due to vibration of the tank wall.
9. Diaphragm membrane is provided within the conservator, preventing direct contact of oil with air, protecting the oil from aging, thereby prolonging the service life of oil. Magnetic oil-level gauge reflects correctly the oil level in conservator. Flat plate-type radiator can effectively cool down the transformer.
10. Reliably sealed, and fine machined for sealed surface. Used double gasket grooves in their jointing surface and kept tight with high quality gasket material. If required by the customer, the upper and lower part of the tank can also be welded tight.
11. High quality paint is applied as surface finish of the tank and exposed steel parts, after shot-blasting and pretreatment, thus ensuring a durable life and glossy surface.
12. Quality assurance rules are also observed for all insulating parts, from raw material to final assembly. Strict regulations are observed for drying, wrapping and storage, preventing the absorption of moisture, swelling, and deformation.
13. Main components
Because of good relationship and long-term co-corporation with all well-known sub-suppliers, we can meet the requirements of customers with whatever types of components they wish to have.
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Our company absorbed advanced technology from home and abord, combined with international and domestic famous manufacturer¡¡¥s advanced technology and experienced manufacturing skills for many years, through the optimization of innovative, successfully produce low-noise, low loss, low partial discharge, high withstand short circuit ability series transformer. In according with latest national safety standard gb1094.1-2-1996, gb1094.3-2003, gb1094.5-2008 and the international electro-technical commission standard iec-76, the main structure features are as follows:
1.Shell-type tank, and a fully folded plate structure, elegant appearance.
2.The core with chamfered joints, non-porous, non-stacked on the iron yoke technology, scientific and rational control of core clamping force, reduce the core losses and electromagnetic noise.
3.Full range location of core and tank, ensure shock resistance during transportation.
4.Advanced and reliable electrical calculation procedures, quantitative analysis of coil positioning the magnetic field distribution, the distribution of oil flow and leakage magnetic field distribution, to ensure adequate electrical strength and low loss, and effective inhibition the partial overheating.
5.The body of transformer adopt multi-coil total assembly, constant drying measures to ensure the coils less rebound and uniform contraction, effectively improving the transformer ability to withstand short circuit.
6.The core and coil internal diameter side adopt strengthen hard paper tube to achieve no gap structure between core and the coil, enhance the strength to withstand short-circuit of coil.
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Furnace Transformer is a power equipment which is suppo- rting for EAF.
It has more stringent requirements in electric, magnetic, thermal, mechanical and other aspects compared with other transformers, and has to comply with the operation process of various furnace transformers and load characteristics, so that it can meet users, and facilitate energy-saving emission reduction and other conditions.
There are many kinds of furnace transformers. The company mainly produce the following products:
High impedance furnace transformer, DC arc furnace transformer, ladle refining furnace transformer, submerged arc furnace transformer (including ferroalloy furnace tran- sformer, calcium carbide furnace transformer, yellow pho- sphorus furnace transformer,single phase titanim slag furnace transformer etc.), electro slag furnace transformer, frequency induction furnace transformer, single-phase graphite furnace transformer, etc.
Take on-load tap furnace transformer with -shaped winding which is developed independently for example, the features as fellows:
The transformer is a arc furnace power transformer which is used to make a high-quality steel and alloy smelting arc furnace. It consists of series voltage regulator transformer and main transformer which are mounted on the same tank. The two low-voltage winding are made of the , replacing the cumbersome welding process between two low-voltage windings.
Features:
1.Wide range of voltage-regulate. Secondary voltage of differential voltage levels meets the arc furnace steel-making process requirements.
2.High-voltage has no restriction of switching insulation level, and it (e.g. 110kV) can be reduced to low-voltage directly, eliminating the intermediate substation and saving more than 30% invested.
3.Easy to choose suitable voltage-level load tap changer, economic and safe.
4.It can be accessed compensation capacitor in order to improve network power factor.
5.The main transformer works in constant flux density. Make full use of materials and have a good conservation.
6.Using the same reverse-phase parallel, electric (or magnetic) shielding, transposed conductors and so on to reduce losses and improve efficiency.
7.A separate voltage coil is used so that ampere-turn balance is good, coupled with cylinder pressure nail structure, its ability to withstand short-circuit is also increased and has high reliability.
8.Using third breaking off instead of primary breaking off so that it can be achieved with low price and high life of low-voltage circuit breakers instead of high price and low life of high-voltage circuit breaks.
Take 31500/110 arc furnace transformer for example, the load loss, no-load loss, no-load current is dropped 13%, 17%, 26% compared with the original product respectively. It is a real energy-saving emission reduction innovative product.
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Rectifier transformer is a transformer which used as the source of rectifier equipment. And primacy side of rectifier transformer connected with AC power is called line side, and secondary side connected with rectifier is called valve side.
Our company use the advanced techniques and manufacturing process, and with domestic colleges and universities to develop a number of research projects. Using procedural design, insulation breakdown mechanism, the electric field numerical analysis and insulation technology, the impact of characteristics and anti-sudden short-circuit strength of winding, the loss of eddy current filed calculation are analyzed and calculated. With manufacturing experience on rectifier transformer for many years, our company has got major break-though on the basis of the traditional calculation, which will further improve the reliability and advancement of products.
Features about rectifier transformer:
1.The rectifier transformer load is non-linear impedance, and valve side windings of rectifier transformer would get the currents which contain fundamental and other high-order harmonic superposition. And line side also gets corresponding non-sinusoidal currents connected by rectifier circuit coupling method.
2.According to different requirements of various customers, the valve side of rectifier transformer has a variety of special coupling method, such as: dual-back-star with inter phase reactor, three-phase bridge, star-delta parallel, six-phase bridge by inter phase reactor.
3.To improve power factor and reduce the line side harmonic currents of high-power rectifier equipments, rectifier transformer is needed to use star-delta winding phase displacement, phase-shift windings by phase displacement, autotransformer phase displacement, to improve the number of pulse of rectifier equipment.
4.According to the user¡¡¥s process requirements, the rectifier transformer line side voltage is required (such as 220kV) straight down to a very low valve side voltage (such as 1kV). The valve side voltage of rectifier transformer is required within a wide range of on-load tap from 5% - 105%. Auto voltage regulator and main theme of unity, string variable voltage regulator and other ways are used in rectifier transformer to achieve the purposes of a wide range voltage.
5.Self-saturable reactor can be used to change over and stabilize voltage in order to smooth rectify voltage. And some use silicon control to regulate voltage.
6.Valve side current of high-power rectifier equipment is very large, reaching 100kA and even greater. To improve power factor and avoid partial overheating and uneven distribution of current rectification components, it¡¡¥s required the technology of reverse-phase parallel.
7.With the wide application of AC frequency control technology, newly developed three-crack drive rectifier transformer came into being. And the lower voltage valve side of this transformer cracked into three independent branches, which can be made to supply for three different load power, which achieve ¡¡ã multi functional ¡¡À effect, reducing loss and saving area.
8.In order to reduce the large current in the fuel tank and other structures caused by loss, the rectifier transformer used magnetic shielding technology and so on.
A number of 220kV and below and different kinds of rectifier transformers have been manufactured for the general industrial, electrochemical electrolysis, transmission, traction frequency, variable frequency power supply, DC power transmission and other industrial sectors over ten years, and got the user¡¡¥s high praise. Recently, the 220kV level on-load-tap rectifier transformers supporting the country¡¡¥s largest 600 thousand project of caustic soda is done, and got the high praise of users.
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Our company provide 330kV oil-immersed power transformer ,with capacity of 360MVA and below. The transformer is based upon world-wide advanced technology and also incorporates the experiences of internationally leading transformer companies as well as our own long-term experiences. Low loss, low partial discharge and high short circuit withstand capability series transformers are achieved through innovation and optimization. Our transformer conform entirely with latest national standard GB1094.1~2-1996, GB1094.3-2003, GB1094.5-2003 and international standard IEC-76. Outstanding features as follows:
1. Low loss, low noise
The core laminations are composed of imported high quality grain-oriented cold-rolled silicon steel sheets with chamfered joints and the joints are step-lapped with 5 steps, thus ensuring low loss and low noise. The inside of the tank is lined with magnetic and copper shields, measures have been take for metallic structural pares located in high magnetic field, to deduce stray loss and thereby the total load loss, and to relieve local overhearing. Performance standard of 330kV class transformers which designed and manufactured by our company, can reach GB 10-type or GB11-type, and the noise is much lower than GB.
2. Safe and reliable service
Reliability is the everlasting objective of our company, partial discharge of finished products are constantly kept below 100pC, ensuring that the transformers can be operated under long service voltage and occasional over-voltage without trouble. Low current density in winding conductor and appropriate cooling arrangement ensure that the winding temperature rise and top oil temperature rise are lower than that specified in the national standard by more than 5K and that the mechanical stress in winding conductor during short circuit does not exceed certain safe limit. Together with technological procedures during manufacture and other means to elevate mechanical strength, transformers can withstand server short circuit in all case during service.
3. Easy erection and maintenance
To minimize erection work at sit, transformers are so fabricated that lifting the active part out of the tank for inspection after arrival at sit is not mandatory. Beside, all components to be mounted on the transformer at site have been preassembled before dispatch, and all secondary wirings have been laid down into conduits on the transformer and connected to the terminals in the control cabinet or terminal box. Natural oil circulation and forced air cooling (ONAF) are generally adapted in our 180kV class transformers below 240MVA. 70% nameplate rating can still be achieved in case the fans are out of service. Little maintenance work is required for the cooling devices.
4. Careful fabrication
Vertical winding machines with tension device are used for winding, so that the windings can be wound more tightly and therefore mechanically strength as a whole. All insulation parts subjected to mechanical stress during short circuit, such as spacers in windings are made with T4 densified pressboard to deduce shrinkage. Drying process for the windings are carried out twice, once for ht individual winding, and again for the assembled phase block. After core and coil assembly, an additional vapor phase drying (VPD) is once more carried out to ensure that all insulation parts are thoroughly dried and no further shrinkage is possible to occur during service. All the high voltage terminals and nearby metallic structural parts are rounded up to prevent partial discharge. High voltage bushing terminals are contained with turrets, and kept concentric with the turret. All the leads are properly crimped and metallized to be rounded up. VPD process insures that the moisture content within the transformer is kept at a very low level, and the core and coil assembly is once more cleaned by condensed vapor flowing down the surfaces. The fabricated tanks are relived from welding stress and shot-blasted integrally, so as to be free form oil leakage trouble and to give the tank a clean, pleasant looking appearance.
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1. New shape design, upgrading hydraulic parts, performance sptimization, best price and high quality
2. Configuration korea imported hydraulic parts, odd and even drive a mechanical walking two models of dual-drivehydrostatic you can choose
3. Structure parts are made by full automatic nc boring processing. Precise gap, uniform lubrication, blasting cleaning. Strong paint adhesion. Cab and covering parts are made by electrophoresis processing and increase corrosion resistance
4. Full- automatic welding, weld joints adopts ultrasonic flaw detection, get weld zero defect.
5. The travelling mechanism adopts advanced 4 wheel drive, fast walking speed, best performance, and suitable for working in bad conditions
6. Luxury decoration, streamline cab, expand drive vision, capacious and comfortable operation space, adjustable chair, advance shock system, low noise
7. Strengthen frame and rotary table, can install vibrantility tool, for example, hammer
8. Pass the agricultural machinery appraisal of shandong province
Iso9001, weight:6550kg, dimensions:6140*2085*2850mm
1. be able to achieve the max.grasping loading distance 4600mm,the unloading distance 5000mm,be satisfied to customers' requirements for loading materials.
2. can match various grasp tools to adapt to different materials,and realise the mutiapplication.
3.hydraulic driving,infinitely variable speed,strong force to be suitable for all kinds of working conditions
4.360 degree swing,with no dead angles when loading and unloading materials.
5.automatic assembly line to weld,ultrasonic inspections are used in the process of welding seam,zero defect on welding.
ISO9001,weight:4720kg,dimensions:4700*2210*2630mm
1.As domestic first company, we design the machine by car design philosopy, create transformers type excavator, and acquire the national patent.
2.The hydraulic system and multi-valve of korea and japan adopt loop pressure compensation, load sensitive type valve, and non-pressure interference, so make the operation coordination.
3.The engine is the newest type yuchai engine, gets the national standard ii.
4.Structure parts are made by full automatic nc boring processing.Precise gap, uniform lubrication.Blasting cleaning. Strong paint adhesion. Cab and covering parts are made by electrophoresis processing and increase corrosion resistance.
5.Full-automatic welding, weld joint adopts ultrasonic flaw detection, get weld zero defect.
6.The cab shows the harmony of mahcine and human. Comfortable aero seat, wide vision. Equipped with the air-condition, and sound.The inside design adopts the enviromental material, and make the inside cab elegant and fresh.
7.Pass the agricultural machinery apprai
sal of shandong province, enjoy nation subsidies.
8.Cummins engine for your choice.
Iso 9001, weight:7760kg dimensions:7260*2088*2690mm
