Winding High Voltage Transformer

 In a word, a transformer is a high voltage winding, composed of a copper core or an aluminum core, and a low voltage winding and a core, the high voltage winding is subjected to high pressure, and it has the insulation level under high pressure. Low voltage windings bear and output low voltage, and the principle of electromagnetic induction is known to all.

 

The transformer's high voltage windings are relative to the low-voltage windings, and the primary coils may be high voltage windings or low-voltage windings. Mainly look at the function of lv winding of transformer. There are many layers of windings because no matter the high pressure area or the low pressure area is determined by the length of the winding conductor of the corresponding thickness, this is also an important factor in determining the volume of the transformer.

 

The input voltage is 10 kV, and the output voltage is 0.22/0.4 kv.

The input end is the high voltage winding, and the output end is the low voltage winding. An ultra high voltage transformer with an input voltage of 500 kV, its output voltage is 110 kV; The input end is the high voltage winding, and the output end is the low voltage winding. The input voltage is 220 V, the output voltage is 12 V, 6 V and so on. The input end is the high voltage winding and the output end is the low voltage winding.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest oil immersed transformer manufacturers in China. We provide power transformer, compact substation and etc. Want to know more ? Contact us.

What is a Double Winding Transformer

 Double winding transformer is used in almost all electronic products. Its principle is simple. However, according to different applications (different purposes), there are different requirements of the winding process of the double winding transformer. The functions of double winding transformer are as follows: voltage conversion; impedance transformation; isolation; voltage stabilization (magnetic saturation transformer); protect the human, etc. The commonly used core shapes of double winding transformers are generally E-type and C-type cores.

 

The most basic type of transformer is two groups of coils with conductors, which are combined in the form of inductance. When an alternating current (with a known frequency) flows into one group of coils, an alternating voltage with the same frequency will be induced in the other group of coils. The induced voltage depends on the degree of the coupling of two coils and the magnetic cross chain.

 

 

Generally, the coil connected to the AC power supply is "primary coil". The voltage of this coil is called "primary voltage". The induced voltage in the secondary coil may be greater than or less than the primary voltage, which is determined by the "turn ratio" between the primary coil and the secondary coil. Therefore, the double winding transformer can be divided into two types: step-up transformer and step-down transformer.

 

Most of the double winding transformers have fixed iron core, on which there are primary and secondary coils. Based on the high conductivity of iron, most of the flux is limited in the iron core. Therefore, a high degree of magnetic coupling can be achieved between the two coils. In some double winding transformers, the coil and core are closely combined, and the ratio of primary voltage to secondary voltage is almost the same as the ratio of turns of the two coils. Therefore, the turn ratio of the double winding transformer can be used as the reference index for the step-up or step-down of the double winding transformer. Because of this, the double winding transformer has become one of the important accessories of modern power system. With the function of increasing and decreasing the transmission voltage, the long-distance transmission is more economical. As for the step-down double winding transformer, it makes the power application more diversified.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest oil immersed power transformer manufacturers. We provide power transformer, dry type transformer and etc. Want to know more ? Contact us.

The Features Of The Amorphous Alloy Dry Type Transformer

 The amorphous alloy dry type transformer is another kind of energy-saving transformer made from a new type of permeability magnetic material, the amorphous alloy. The transformer has an over 70% lower no-load loss and around 80% less no-load current than those transformers with the silicon steel sheet as its iron core. As a distribution transformer with an ideal energy-saving performance, the amorphous alloy dry type transformer is especially suitable for the rural power grid and developing areas where the load rate is low.

 

The amorphous alloy dry type transformer has good economic and social benefits and is widely used in places such as airports, stations, urban power grids, high-rise buildings, and power plants. Its features are as following:

 

1. Adopting the amorphous alloy as the magnetic material is environment friendly and energy-saving.

 

2. Three-phase and five-pole structure is adopted. And compact and practical frame structure is adopted around the iron core as protection.

 

3. The technology of mirror pouring in vacuum pressure is taken to make its coils. And it gets a distinguished appearance and a strong ability to resist sudden short circuit.

 

4. It has advantages of small partial discharge, superior thermal stability, low noise, and strong overload capacity.

 

5. During its operating process, the product is maintenance-free and widely used in commercial buildings and load center areas.

 

Because of the formation of the amorphous alloy ribbon, the cross-section of the iron core is generally rectangular. So is the winding. In a magnetic yoke, there is a breaking point. The breaking point group of the winding is opened and followed by closing the breaking point. The three-phase and three-pole structure is adopted in its core. Because the amorphous alloy dry type transformer has the benefits of inflaming retarding, high reliability, and maintenance-free, it has a broad development prospect in the power distribution market.

 

YueBian Electric Co.,Ltd is a china transformer supplier. Welcome to buy the amorphous alloy dry type transformer from YueBian Electric Co.,Ltd.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest transformer manufacturers in china. We provide power transformer, dry transformer and etc. Want to know more ? Contact us.

Step Down Transformer Efficiency

 The transformer winding is the internal circuit of the equipment, which is directly connected with the external power grid, and it is the most important part of the transformer. The winding is often called the "heart" of a transformer. The change of winding turns can change the voltage. When the winding is combined with the core, that is the transformer itself makes up of the electromagnetic induction system, we can get the required voltage and current.

 

The transformer for depressurization can be used as a step-down transformer, but the step-down transformer of the power system can not be used as a step-up transformer, and the step-up transformer can not be used as a step-down transformer. An important parameter of the transformer is the number of turns per volt, that is how many turns should have in one volts. After the voltage is determined, the number of turns is also determined. But transformers have losses. When twining the winding, the number of coils in two turns is 5% more than the one time turns. That is, the voltage of the two times is 5% more than one time turns.

 

Such as the step-down transformer, the one time turns is a high voltage and the two time turns is a low voltage. If it is used for boosting, the low voltage is the one time and the high voltage is the two time, and the coil of high voltage should be 5% more than the low voltage. But in fact, the coil of  low voltage is 5% higher than the coil of high voltage. The number of coil of the high voltage is 10% less than the number of coils in theory and  the voltage is also 10% less than the voltage in theory. And the rated voltage is not reached.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest transformer manufacturer in china. We provide power transformer, electrical distribution transformer, oil transformer, package substation and etc. Want to know efficiency of step down transformer or more ? Contact us.

Types of Oil Immersed Transformers for Sale

 The oil-immersed amorphous transformer is equipped as low coercive force, low loss, good temperature stability and strong protection for thunder and lighting. With the combination of advanced manufacturing process and equipment, oil immersed power transformer is remoted in communication, test, adjustment, and control by computer. All oil insulated transformers are qualified by National Mechanical & Industrial Bureau and National Power Company. Our oil insulated transformer is widely used in power network, projects, grid construction, etc. If you are interested in our products, you can contact us. We will negotiate with you at a reasonable oil immersed transformer price.

 

How Often Should Transformer Oil Be Changed

Generally speaking, there is no specific time for the replacement of transformer oil, and some can be used for more than 20 years. The change of transformer oil mainly depends on the state of the oil in operation.

According to the oil transformer testing, the transformer oil in operation must be tested for oil quality analysis every time a period of time has passed. According to the results of the testing and analysis or the operating status of oil insulated transformer, consider whether the transformer oil needs to be replaced.

 

Procedure of Filling Oil in Transformer Tank

Oil filling of oil field transformer usually takes the following two methods;

1. Vacuum oil filling: According to the requirements of the factory manual. While keeping the oil tank with a certain degree of vacuum, slowly inject qualified transformer oil from the drain valve at the bottom of the oil tank (the vacuum degree will not be released during oil filling).

2. Conventional oil injection: Under atmospheric pressure, use an oil pump to inject qualified transformer oil into the oil tank.

 

Oil Type Transformer Safety

The basic protections used in oil field transformers especially power transformers can be categorized in two parts i.e. Electrical Protection & mechanical Protection. Main electrical protections are Differential, REF, over flux and over load Protection while the Over current, Earth Fault & Distance Protection is used as backup protection. For oil field transformers the mechanical protections which are discussed below are important:

1. Buchholz Relay

2. Sudden Pressure Relay

3. Winding Temperature & oil Temperature Alarm & trip.

4. Oil Level Alarm and Trip Arrangement.

5. PRD Alarm & Trip.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is the largest china power transformer manufacturer and oil immersed power transformer manufacturer. We provide power transformer, electrical distribution transformer, oil transformer, electrical transformer and etc. Want to know oil immersed transformer price or more ? Contact us.

 

33/11kv Power Transformer

 Description of 33/11kv Power Transformer

 

Oil immersed power transformer, based on know-how accumulated over decade years in oil immersed distribution transformer field, YUEBIAN’s oil-immersed transformers have been supplied to various industries including semiconductor, steel work, and petrochemical.

 

Further, as an outstanding and comprehensive oil immersed distribution transformer solution provider, we respond to the oil immersed power transformer demanding requirements of our customers by developing and manufacturing both eco-friendly pole mounted distribution transformer and high-efficiency oil immersed power transformer.

 

Both oil immersed distribution transformer and pole mounted distribution transformer are designed for power centers, substations and network, also for pad mounted oil immersed power transformer, used in public distribution system, commercial building and industrial complexes

 

Introduction

Phase: three

 

Cooling Method: ONAN, ONAF/ OFAF

 

Frequency: 50 or 60Hz

 

Vector Group Of Power Transformer Used In 33 11kv Substation is: Dyn11, Yd11, Ynd11, or others

 

Capacity Range: 100KVA to 31500KVA

 

Primary Voltage: 30KV to 38.5KV

 

Coolers: corrugated wall or radiator

 

Oil preservation: hermetically sealed or conservator/free breathing

 

Tap changer: Off-circuit or On-load. 3 steps; 5 steps; 7 steps; 9 steps; 13 steps; 17 steps

 

Cooling medium: mineral oil

 

Winding materials: aluminum or copper

 

Parts: Oil draining valve, Oil level indicator, Thermometer, Gas relay, Pressure relief valve, Earthing terminal, Lifting lugs, Nameplate, Outdoor bushings, etc.

 

Rating Plate: Yes (YUEBIAN brand or Customer brand)

 

Execution Standard: IEC 60076, GB1094.1-2018

 

Features of 33/11kv Series Power Transformer

 

The three-phase oil-immersed transformer produced by our company adopts a new insulation structure to improve the short-circuit resistance; the iron core is made of high-quality cold-rolled silicon steel sheet; the high-voltage windings are made of high-quality oxygen-free copper wire. It has a multi-layered cylindrical structure; all solid parts are specially secured against loosening.

 

The product has the characteristics of high efficiency and low loss, which can save a lot of power consumption and running cost, and has significant social benefits. It is a new technology product promoted.

 

 

•Unique Welding Process, No Leakage

 

Eliminate the high and low pressure risers to reduce welds; the fuel tank wall uses wide-width steel plates to reduce joints; a unique welding process to ensure welding quality.

 

•Groove Structure

 

All sealing flanges are grooved to ensure sealing performance.

 

•Control Leakage

 

All the oil drain valves of the transformer are made of copper valves, and the radiator uses a vacuum butterfly valve to reduce the leakage of the transformer.

 

•Low Loss, Low Noise

 

Adopt domestic and foreign advanced technology and equipment, professional research and development. The core adopts high-performance cold-rolled oriented silicon steel sheet and fully automatic robot lamination machine with small shear burr and low lamination coefficient, which effectively reduces the no-load loss, no-load current and noise of the transformer. The no-load loss is 5% to 15% lower than the manual lamination.

 

•High Reliability

 

The transformer is equipped with an oil surface thermometer, the top of the fuel tank is equipped with a pressure relief valve with a contact point, the oil level indicator of the oil storage cabinet is an oil level gauge with a contact point, and the high and low pressure casing is an anti-fouling enhanced pure porcelain oil type casing, which can be used for Heavy pollution level environment.

 

•High Quality Insulated Skeleton Support inside the Coil

 

The inside of the coil is supported by a high quality insulating skeleton. All coils adopt inner and outer struts, all struts and blocks are chamfered, the electric field is uniform, and the reliability is enhanced. All fasteners on the axial body of the coil are self-locking locknuts, so that the product can withstand long-distance transport bumps without looseness and without the need for a lifting core.

 

Professional Service of 33/11kv Series Power Transformer

 

Pre-Sales Service: provide design consulting service in accordance with customer requirements, and provide separate design scheme according to different customer markets to make products more competitive.

 

After Sales Service:

 

• We can provide on-site installation instructions, commissioning and after sales service. (Fee-for-service)

 

• You will get free lifelong technical advice from our highly qualified engineers. This will give you a lot of confidence when buying from our company.

 

• We guarantee the ongoing supply and preferential prices for spare and wearing parts.

 

• Our highly qualified team of service technicians are well equipped to keep your transformer operating at high efficience at all times.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest oil immersed transformer suppliers in China. We provide power transformer, oil transformer, step down transformer, 33kv 11kv transformer and etc. Want to know 11kv transformer details or vector group of power transformer used in 33 11kv substation is ? Contact us.

Double Wound Transformer Applications

 Double wound transformer definition?

Double wound transformers is a common transformer product with main functions include voltage change, impedance transformation, isolation and voltage stabilization.

 

The manufacturing process is different according to different applied occasions (or different purposes). Three wound transformer has three wounds of each phase. When one wound connects to the AC power, the other two wounds can induce different electric potential. The double wound transformers are used for load which requires two different levels of voltage. Usually in power plants and substations, there are three different levels of voltage, so three wound transformers are used widely in the power system.

 

Double Wound Transformer Construction

High, middle and low voltage wounds of each phase are set in the same core column. In order to make the insulation reasonable, usually the high voltage wound is put in the outer layer, with middle and low voltage wounds placed in the inner layer. Based on the high magnetic conductivity of iron materials, most of the flux is confined in the core. Therefore, the two sets of coils can get a high degree of magnetic coupling.

 

Double Wound Transformer Advantages

Because of the function of voltage boost and buck, the transformer has become one of the most important appendages of modern electric power system. The increasing electricity transmission voltage makes the long-distance transmission more economical. As for step-down transformer, double wound transformers makes the usage of electricity more diversified. It can be said that if there are no double wound transformers, modern industry is unable to reach such a great level at this time.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest power transformer manufacturers in china. We provide distribution transformer, oil transformer and etc. Want to know double wound transformer diagram or more ? Contact us.

Application Of Three Phase Transformer

 Application Of Three Phase Transformer

The three-phase transformer is widely used in the circuit of AC 50 Hz to 60 Hz, voltage below 660 V. The construction of a new grounded middle line in the three-phase transformer can avoid the interference of the power grid and other middle lines by converting the three-line delta connection to the four-wire Yo system.

 

Since the three-phase transformer can further exempt the high-frequency pulse interference and noise from the internal coupling of the transformer, it is generally used in precision machine tools. In addition, the three-phase transformer products are also widely used in industrial and mining enterprises, textile machinery, printing, packaging, petroleum chemical industry, schools, shopping malls, elevators, post and telecommunication, medical machinery, office equipment, test equipment, industrial automation equipment, household appliances, high-rise buildings, machine tools, the transmission and distribution of the tunnel and the imported equipment to ensure the normal voltage.

 

It is also suitable for low voltage distribution with low voltage and wide fluctuation. The application range of three-phase transformer is wide, because it has a high degree of isolation, high suppression of common-mode interference, good N-G performance, and customized design according to the special needs of users. That is why its usage is so widespread.

 

Yuebian Electric Co.,Ltd, approved by ISO9001, is one of the largest china power transformer manufacturers. We provide power transformer, oil transformer and etc. Want to know applications of three phase transformer ? Contact us.