Regarding the transformer, what is the primary current, what is the secondary current Please, everyo

The primary current of transformers and other small transformers of household appliances refers to the input current of the power supply, and the secondary current refers to the output current. In the feed-in step-down line of the power supply side, the current on the high-voltage side is the primary current, and the low-voltage side is the secondary current. On the active transmission side (such as a power plant or step-up substation), the current on the low-voltage side is called the primary current, and the high-voltage side is called the secondary current.

There are generally three different types of transformers: step-up transformer, step-down transformer and coupling transformer, the current of the primary coil is called the primary current, and the current of the secondary coil is called the secondary current.

The primary current of the transformer is the current on the high side of the transformer, and its value is small. It's about 10 to tens of a. The secondary current is the current on the low voltage side, and its value is larger, reaching several hundred A.

The number of turns of the transformer's primary coil is more than that of the secondary coil, the voltage is high, the current is small, and the number of turns of the transformer's secondary coil is less than the primary coil, and the voltage is low and the current is large, which is called the secondary current.

Landlord, I will give you the information of the primary current and the secondary current, you know.

It is the primary current and the secondary current.

Maybe you still don't understand, what does it mean to increase the load in the circuit? How does the circuit react when the load increases?

In layman's terms, the load increase means that the driven load becomes heavier, and we have to use more force to drag it. In a circuit, the increase in load means that the resistance of the electrical appliance becomes smaller, and the output energy of the circuit becomes larger (the output current becomes larger if the output voltage remains the same).

When the load of the transformer increases, the secondary current will definitely become larger because it has to output more energy. The primary current increases at the same time because the transformer does not produce energy, its output energy comes from the input energy.

The transformer is a whole, the change of the secondary current will be reflected to the primary through the change of electromagnetic induction, if there is no electromagnetic induction between the primary stage, naturally can not complete the function of voltage transformation, the transformer through the electromagnetic induction change between the coils, the alternating current of one voltage level is converted into the same frequency under another voltage level of ACElectrical energy。To be precise, it has the functions of transforming, converting, converting impedance, transferring energy, and isolating circuits. It is recommended that you go online to learn the principle of transformers.

Formula method calculation: the primary current of the transformer comedy = s (, the secondary electro-hydraulic hidden current = s (.

Other methods for calculating primary current:

1. Rapid estimation method.

The transformer capacity is 100, take an integer multiple, and then * the current value of the high voltage side, if it is *144, it is the current value of the low voltage side!

For example, if a 1000kVA transformer is taken and the whole multiple of 100 is 10, then the current on the high voltage side is 10*, and the current on the low voltage side is 10*144=1440A

2. Linear coefficient method.

By keeping in mind the current values of the high and low voltage side of a transformer of a common capacity, other capacities can be linearly deduced.

Example: For example, for a 1000kVA transformer, the calculated value of the current on the high voltage side is and the calculated value of the current on the low voltage side is, then keep this value in mind, and the other capacities can be derived from this.

Then for the 1600kva variable load shroud presser.

The current on the high side is 1600 1000*, and the current on the low side is 1600 1000*

3. Rough estimation method.

High-voltage side current = transformer capacity 20, low-voltage side current = transformer capacity * 2 For example, for a transformer of 1000kva, high-voltage side current = 1000 20 = 50A, low-voltage side current = 1000 * 2 = 2000A, this method is too rough, and it is generally a common method used by design institutes when selecting switch elements, selecting and calibrating cables.

10kV, the quick calculation formula of the primary current of the transformer: per 100 kVA * 10kV, the quick calculation formula of the secondary current of the transformer: 144A primary current per 100 kVA:

Generally, it refers to the current of the coil on the input side of the transformer. Secondary current: generally refers to the current of the coil on the output side of the transformer.

1.The formula for calculating the current of the three-phase transformer is i=s (root number 3*u), where: u:

is the line voltage of the transformer, kv; S: is the apparent power (kVA) of the transformer. 2.

Transformer current experience port algorithm: primary current i s * collapse secondary current i s * for example: a 500kVA transformer 10; The primary and secondary currents are calculated as:

a.Use the current formula i=s (root number 3*u) to excite i=500 root number 3*10=500 i=500 Ming shirt root number 3* bCalculated by the transformer current experience mouth calculation formula:

i=500* i=500*

If the ratio of the number of primary turns to the number of secondary turns of the transformer is 5:1, the primary voltage is 12V, the power is 24W, the primary current of the transformer is 2A and the secondary current is 10A.

In an ideal transformer, the primary upper power is equal to the secondary upper power, so the ratio of the primary voltage to the secondary voltage is equal to the turns ratio, so the secondary voltage is equal to 12 5=

The power is 24W, so the primary current = 24 12 = 2A, and the secondary current = 24 <>

Because when the secondary side of the transformer is open, when the AC voltage is applied on the primary side, an alternating magnetic flux will be generated in the core and pass through.

Primary and secondary windings. Under the action of this magnetic flux, the induced electromotive force generated by the primary and secondary windings is proportional to the number of turns of the winding, that is, the transformer plays a role in transforming the voltage when it is not loaded.

When the secondary winding of the transformer is connected to the load, under the action of the induced electromotive force of the secondary winding, there will be a current passing through the load, and the current will also produce a magnetokinetic potential, acting on the same core, which is in the opposite direction to the magnetic potential generated by the main magnetic flux, that is, it plays the role of demagnetization. However, since the main magnetic flux is determined by the supply voltage, and the supply voltage is basically unchanged, the main magnetic flux is basically unchanged.

Therefore, a part of the current will be added to the primary winding, and the magnetodynamic potential generated by it will cancel out the magnetokinetic potential generated by the secondary side current. Therefore, when the load current flows through the secondary winding, a part of the load current is also added to the primary winding to play the role of power transfer. However, this part of the load current added in the primary winding is numerically inversely proportional to the transformer's transformation ratio.