Who understands the manufacture of transformers. I have just entered the transformer manufacturing p

The place you do should be the cutting group! Specializing in cutting silicon steel sheets, that thing is very sharp, especially the cutting knife blunt out of the silicon steel sheet is particularly deep, and if you are not careful, it will be a hole and blood will be left out! But fortunately, I cut the film for 3 months in the cutting group, and I was on it twice, the first time, I got 4 stitches, and then it was a small injury, and it was useless for others to tell you, the key is personal!

If you are careful, you won't get scratched! The place you do should be the cutting group! Specializing in cutting silicon steel sheets, that thing is very sharp, especially the cutting knife blunt out of the silicon steel sheet is particularly deep, and if you are not careful, it will be a hole and blood will be left out!

But fortunately, I cut the film for 3 months in the cutting group, and I was on it twice, the first time, I got 4 stitches, and then it was a small injury, and it was useless for others to tell you, the key is personal! If you are careful, you won't get scratched.

I personally saw my master's hand scratched by the silicon steel sheet, and he almost crossed off the big finger mother, and he bled a lot!

Another time someone cut off his middle and ring fingers (the nail cap was cut off in half), but he reconnected it!

You think about how scary it is, so you have to pay attention when you cut the film!

The steel sheet is now stamped, and it is generally annealed and pressed after stamping. If you are afraid of cutting your hands, you should bring an electrician's glove, which will not shed hair and will have little impact on the steel sheet.

Don't care what you do, be careful, when you grab the iron piece with your hand, your palm should bulge, my company has produced transformers for many years, and those who are injured are careless, don't be so afraid.

If it's an internal part, it's a core lamination, and if it's an external accessory of a transformer, as you said, it's a piece.

Dry-type transformers.

A transformer is a device that uses the principle of electromagnetic induction to change the alternating voltage, and the main components are the primary coil, the secondary coil and the iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulation (magnetic saturation transformer), etc.

According to the use, it can be divided into: power transformer and special transformer (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mining transformer, audio transformer, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.).

Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and equipment and other places. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When naturally air-cooled, the transformer can operate continuously for a long time at the rated capacity.

When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation, or emergency overload operation; Because the load loss and impedance voltage increase greatly during overload, it is in a non-economic operating state, so it should not be in long-term continuous overload operation.

Looking at the power consumption of the factory, the general situation is a dry-type transformer, and the purchase and maintenance costs will be relatively high if the oil-immersed transformer is used, but the capacity of the oil-immersed transformer can be much larger than that of the dry-type transformer, and the voltage level will be much higher.

However, under normal circumstances, the voltage level of the factory load is 400V, and the special line of the power supply bureau is often 10kV, so the dry-type transformer is enough to meet the use.

If the special line of the power supply bureau is 110kV, then an oil-immersed transformer is required.

Generally, factories use double-coil oil-immersed air-cooled step-down transformers.

If you run a sole proprietorship, you can directly apply to the administrative authority for industry and commerce for the pre-approval registration of the enterprise name, and you can receive the business license of the sole proprietorship enterprise after a few working days, and the registration fee for the business license is charged according to the amount of registered capital. Small businesses do not have much capital, usually 4 per 1,000.

If you run a factory that is jointly funded by several people, and you need to consider the need to obtain general taxpayer qualifications in future production and sales, you may need to set up a company-type enterprise, more than 2 to 50 people jointly funded ****, the minimum registered capital is 30,000 yuan, if it is a person, the minimum registered capital is 100,000 yuan. In the case of setting up a company, you first need to apply to the administrative authority for industry and commerce for the pre-approval registration of the enterprise name, the co-investor or you personally formulate the articles of association, and apply to the commercial bank to open a temporary account according to the "notice of pre-approval of the enterprise name" approved by the administrative authority for industry and commerce, and deposit the prescribed registered capital into the temporary account, and then, entrust an accounting firm to verify your capital contribution and issue a capital verification report, which needs to cost 500-1000 yuan of capital verification fees. Other company registration fees are the same as those for sole proprietorship registration.

Our factory is located in Huiyang Xinwei, Huizhou, and the factory has been difficult to apply for a transformer for ten years.

It's just an online exchange, so it's interesting to talk about what's not divided? Suggestions: It is illegal to run a factory without an industrial and commercial license, and the application for transformer installation must first be approved by the power department, and then determine the specifications according to the proposal of the other party. Every region is different.

Find some people around who know about it, and be careful to walk the ship of ten thousand years.

First of all, it is necessary to investigate the power supply voltage of the place of electricity, the actual electricity load of the user and the conditions of the place, and then select one by one with reference to the technical data marked by the nameplate of the transformer, generally from the transformer capacity, voltage, current and environmental conditions, wherein the capacity selection should be determined according to the capacity, nature and use time of the user's electrical equipment, so as to select the transformer capacity.

During normal operation, the electrical load of the transformer should be about 75 90% of the rated capacity of the transformer. If the actual load of the transformer is measured to be less than 50% during operation, the small-capacity transformer should be replaced, and the large-capacity transformer should be replaced immediately if it is greater than the rated capacity of the transformer.

At the same time, in the selection of transformers, the voltage value of the primary coil of the transformer is determined according to the line power supply, and the voltage value of the secondary coil is selected according to the electrical equipment, and it is best to choose the low-voltage three-phase four-wire power supply. This provides both power and lighting at the same time.

For the selection of current, it should be noted that the load can meet the requirements of the motor when the motor is started (because the starting current of the motor is 4 7 times larger than that when the motor is sinking).

Ohm's law must still be complied with, and the balance of power is determined by the load of the secondary: the primary supply of as much power as the secondary needs. Therefore, the current of the primary is determined by the current of the secondary, and the current of the secondary is determined by the voltage of the secondary and the load connected to the secondary.

A transformer is an electronic component that uses the principle of electromagnetic induction to change the alternating current voltage, and the number of turns you mentioned indicates that the voltage ratio between the primary stages is 4:1, that is, the output voltage is a quarter of the input voltage. Whereas, the primary current varies according to the secondary current, which is determined by the load.

For example, if your load is 10kw, and the rated power of the transformer is 1kw, it does not mean that the transformer cannot be used, but the power taken by the load to the transformer is 10 times the rated power of the transformer, and the transformer will work in an overload state, and the temperature will rise after the transformer works for a while, and the transformer will burn out after a long time.

No matter how big the load you are mentioning, its voltage is constant, but the current changes. i=u/r。

1: (The primary and secondary electrical power is equal) is only theoretical, but in practice, the efficiency of the transformer below 100VA with loss is not more than 85%.

2: (The current is 2A) This is the full load current. Only in the primary time the secondary output is 2A, and when the secondary current changes, the primary current also changes.

3: Ohm's law is common in AC and DC circuits.

4: Assuming the load is 100 ohms, the transformer output is 30V, and the current through the resistor is, you have made a conceptual mistake by giving 100*2=200V.

Now that we know that the primary and secondary electrical power are equal, the corresponding secondary current is 2A, and the load resistance:

r＝u/i＝30/2＝15(ω)

If the load resistance is 100, the secondary current:

i＝u/r＝30/100＝

Primary Current: i

This "factory" refers to a power plant, not a factory in general. This specialized "factory transformer" has its own standard. He used it specifically to supply the power plant itself.

From the point of view of safety, his short-circuit impedance is greater than that of ordinary distribution transformers. In addition, the technical requirements are the same as those of general distribution transformers.

Isolation transformers, primary and secondary are the same.

1. Find the cross-sectional area of the iron core s=

2. The number of turns per volt o=45 s=45 turns.

3. Simple calculation method for the number of primary and secondary coils 1 = 2 = 220x36 = 7920 turns of single-phase small transformer.

1. Determine the current of the primary coil and the secondary coil according to the capacity.

i=p ui unit a, p unit va, u unit v

2. Determine the size of the cross-sectional area of the iron core according to the power required.

s = Note: root number p).

S unit cm

3. Know the cross-sectional area of the iron core (cm) to find the transformer capacity.

p=(s 4, turns per volt.

o=45/s

5. Wire diameter.

d= (root number i).

6. The number of turns of the primary and secondary coils.

1=u1ωo

2=u2ωo

You forgot about the magnetic core (iron core)!

Buy a ready-made transformer, 1 kilowatt power, more than 100 yuan, don't have to toss so much! Make it yourself, materials, time and other factors, the gains outweigh the losses! Of course, if it's just for the purpose of studying, it's worth the time!

It is recommended to buy a 1000 watt voltage regulator, which is a toroidal coupling transformer, remove the voltage regulating accessories, and then wind the secondary. Generally, the output voltage is measured in 10 turns, and the number of winding turns required can be calculated.

Find the cross-sectional area of the iron core s=, the ring is not calculated in this way.

Column section in the iron center:

s Transformer power:

p＝(24/

Turns per volt: n 45 s 45 24 turns).

Primary 220V Turns:

N1 220 turns).

Secondary 48V (double wire winding rear tap) turns (5% turns must be added to make up for iron and copper losses):

N2 48 turns).

Secondary 12V Turns:

n3 12 turns).

Primary current: i1 p u 350 220

The default secondary dual 48V power is 340W and 12V is 10W.

Secondary dual 48V current:

i2＝340/(48×2)≈

i3＝10/12≈

Primary wire diameter (current density:

D1 Secondary Dual 48V Wire Diameter:

D2 Secondary 12V wire diameter: D3