jbk high voltage transformer power transformer

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Scope of application

The transformers are applicable to AC50-60HZ circuits,it could be widely used on control power supply for mechanical equipments such an bridge crane,ship,wind power generation,photovoltaic power generation,testing machines,local lighting,signal lamps and others.


It has charachteristics of excellent performance,reliable operation,low energy consumption,small volume,safe wiring and wide application,and as it can work for a long term under rated load,it is an ideal variable voltage power supply.

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.jpgjbk high voltage transformer power transformer

About us

The main products  include different kinds of transformer ,such as EI transformer,encapsulated transformer ,switch power supply transformer,inducatance transformer,BK&JBK transformer,toroidal transformer,intelligent servo transformer,three-phase dry type transformer,QZB transformer,special transformer and others.

We does a lot of tests during design,developing and the application of raw material and uses high quality raw material fianlly.So the transformer has the advantages of low no-load loss,high efficiency and low temperature rise.It has been widely used in household appliances,intelligent meters,solar meters,solar meters,automatic equipment,special equipment and others.

In the process of manufacturing and business,We always sticks to the principle of honoring contract,keeping credit,complying with business ethics and seeking the perfect quality.Being the leader of transformer and electronic components industry is the development goal .Comparing price under the same quality and comparing quality&service under the same price is the business concept .Devoting of your requirement,We will supply you excellent service from products concept to designing,sample making,confirmation,producing,testing and delivering.We would like to cooperte with you and build a bright future together.

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Q:The main transformer is chosen in principle
Transformer selection, you can refer to the following, but still according to the actual production needs! 1, the number of transformers to determine    (1), the number of main transformer to determine the principle is to ensure the reliability of power supply. When one of the following conditions is met, two or more transformers shall be installed.    ①, there are a lot of first-class load and although the secondary load but need to set from the security (such as fire, etc.).    ②, when the seasonal load changes greatly.    ③, when the load is large.    For large-scale hub substation, according to the specific circumstances of the project can be installed 2 to 4 main transformer.    When installing multiple transformers, it is appropriate to group the transformer according to the characteristics and changes of the load in order to flexibly switch the corresponding transformer group. Transformers should be operated in the sorted manner. Transformer low-voltage outlet of the neutral and neutral ground wire should be laid separately. For the convenience of testing, in the ground circuit, close to the transformer to do a removable connection device.    (2), the general three-level load or capacity is not too much power and lighting should be a load with only one transformer.    (3), when any of the following circumstances, can be dedicated transformer    ①, when the lighting load is large or power and lighting using a common transformer seriously affect the lighting quality and lamp life, can be set for lighting special transformer.    ②, single single-phase load is large, should be set single-phase transformer.    ③, the impact of a larger load, seriously affect the power quality, can be set for shock load special transformer.    ④, when the seasonal load (such as air conditioning equipment, etc.) about the total load of the project 1/3 and above, it is appropriate to configure a dedicated transformer.
Q:How to distinguish between large, medium and small transformers
We usually put the capacity of 630kVA and below the transformer for the small transformer; 800-6300kVA transformer for the medium-sized transformer; 8000-63000kVA transformer for large transformers; 90000kVA transformer for large transformers. With the transformer capacity bigger and bigger, in the past that can only be called large-scale medium.
Q:What is the reason why the dry transformer is loud
500kva below the dry-type transformer noise 56 to 58 dB or so, 630kva above 62 to 65 dB or so! This is our factory data. The dry-type transformer sound is great. Big like cattle called the same, because the core is loose!
Q:What is the meaning of the high voltage side and the low side of the transformer?
High voltage side called high side of the low voltage side called low side
Q:What is the principle of the conversion of the transformer? How to restore the secondary side to the primary side?
3. The sum of the current: I2 '= I2 / k 4. The sum of the impedance: r2 '= k ^ 2 * r2 x2' = k ^ 2 * x2
Q:Why is the transformer coil insulation?
Because the transformer is used in different environments, according to different insulation level selection, can extend the life of the transformer. Transformer (Transformer) is the use of electromagnetic induction principle to change the AC voltage of the device, the main components are primary coil, secondary coil and core (core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulator (magnetic saturation transformer) and so on. According to the purpose can be divided into: power transformers and special transformers (electric furnace change, rectifier, frequency test transformer, voltage regulator, mine transformer, audio transformers, IF transformers, high-frequency transformers, impact transformers, instrument transformers, electronic transformers , Reactors, transformers, etc.). Circuit symbols commonly used as the beginning of the number. Example: T01, T201 and so on.
Q:How do you choose the public transformer capacity?
In the actual choice, should adhere to the "small capacity, dense point" principle Distribution transformer location should be located in the load center, and the power supply radius of not more than 0.5 km. Distribution transformer load rate between 0.5 to 0.6 the highest efficiency, At this time the capacity of the transformer is called the economic capacity. But if the load is relatively stable, then the continuous production of the situation can be selected according to economic capacity transformer capacity.
Q:1000KVA transformer no-load loss is how much?
I am in the "China Electromechanical Product Catalog" found a data, 10KV, S9-1000KVA no-load loss is 1.7KW, so the annual loss of power: 1.7 * 8760 = 14892KWH (degrees).
Q:What are the malfunctions and abnormal operation of the transformer?
working principle: Transformer is the use of electromagnetic induction principle made of static appliances. When the transformer's original coil connected to the AC power supply, the core will produce alternating magnetic flux, alternating magnetic flux with φ said. The original, the secondary coil φ is the same, φ is also a simple harmonic function, the table for the φ = φmsinωt. By Faraday's law of electromagnetic induction, we can see that the induced electromotive force in the original and secondary coils is e1 = -N1dφ / dt, e2 = -N2dφ / dt. Where N1, N2 is the original, the number of turns of the secondary coil. U1 = j1n1, U2 = E2 = -jN2ωΦ, and the complex value is U1 = -I1 = jN1ωΦ, U2 = E2 = -jN2ωΦ, and the complex value is U1 = Let k = N1 / N2, said the variable ratio of the transformer. U1 / U2 = -N1 / N2 = -k, that is, the ratio of the original value of the transformer and the secondary coil voltage, is equal to its turns ratio and the difference between the original and the secondary coil voltage is π. And then come to: U1 / U2 = N1 / N2 In the case of no-load current, I1 / I2 = -N2 / N1, that is, the original and secondary coil current RMS value is inversely proportional to the number of turns, and the phase difference π. And then available I1 / I2 = N2 / N1 Ideal transformer original, vice coil power equal P1 = P2. Indicating that the ideal transformer itself without power loss. The actual transformer always has the loss, its efficiency is η = P2 / P1. Power transformers are highly efficient and up to 90%.
Q:Inverter with transformer and transformer without the difference
Inverter with a transformer is played a role in isolation, it can provide you with pure sine wave current, so that the PV grid-connected system can provide a more secure and reliable isolation.

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