Paramètres principaux du transformateur basse fréquence

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1. Le rapport de tension

Réglez le nombre de deux groupes de low-frequency transformateur bobines comme N1 et N2, N1 est l'enroulement primaire, N2 est l'enroulement secondaire.
Une tension alternative est appliquée à l'enroulement primaire et une force électromotrice induite est générée aux deux extrémités de la bobine secondaire.
When N2>N1, its induced electromotive force is higher than the primary voltage added, this low-frequency transformateur is called boost low-frequency transformateur.

L'efficacité de 2.

At rated power, the ratio of the output power to the input power of the low-frequency transformateur is called the efficiency of the low-frequency transformateur, that is, η=P2/P1×100%.
Where η is the efficiency of the low-frequency transformateur, P1 is the input power and P2 is the output power.
When the output power P2 of the low-frequency transformateur is equal to the input power P1, the efficiency η is equal to 100%, at this time the low-frequency transformateur will not produce any loss, but in fact this low-frequency transformateur does not exist, low-frequency transformateur transmission power always produce loss, this loss mainly copper loss and iron loss.
The efficiency of the low-frequency transformateur is closely related to the power level of the low-frequency transformateur. Usually, the greater the power, the smaller the loss and the higher the efficiency.
Au contraire, plus la puissance est faible, plus le rendement est faible.

3. Fréquence de travail

Because the low frequency transformateur core loss and frequency is very important, it should be designed and used according to the frequency of use, this frequency is called the working frequency.

4. Tension nominale

This parameter refers to the voltage allowed to be applied on the primary winding of the low-frequency transformateur. The voltage applied on the primary winding of the low-frequency transformateur shall not be greater than the specified value in normal operation.

5. Puissance nominale

Rated power refers to the low frequency transformateur in the specified frequency and voltage, can work for a long time, and does not exceed the specified temperature rise of the secondary output power.
The unit of rated power of low-frequency transformateur is VA(volt ampere), instead of W(watt). This is because there will be part of reactive power in the rated power, so it is more accurate to express VA.

6. Pas de courant de charge

When the low-frequency transformateur secondary winding open, there is still a certain current in the primary coil, this current is called no-load current.
Le courant à vide est composé d'un courant magnétisant (générant un flux magnétique) et d'un courant de perte de fer (causé par une perte de noyau).
Pour le low-frequency transformateur with 50Hz power supply, le courant à vide est fondamentalement égal au courant de magnétisation.

7. Aucune perte de charge

When the low-frequency transformateur is open in the secondary, the power loss measured in the primary is the no-load loss.

8. Résistance d'isolement

This parameter represents the insulation performance between each coil of the low-frequency transformateur and between each coil and the iron core.
La résistance d'isolement est liée aux performances, à la température et à l'humidité du matériau isolant utilisé.
Insulation resistance is a parameter that represents the insulation performance of low-frequency transformateur. It is the ratio of voltage and leakage current applied on the insulation layer, including the insulation resistance value between windings, windings and core and shell.
Parce que la résistance d'isolement est très grande, on ne peut généralement utiliser qu'un mégohmmètre (ou un multimètre R × bloc 10kΩ) pour mesurer sa résistance.
If the insulation resistance of the low-frequency transformateur is too low, the case may be charged in use and even the low-frequency transformateur winding may be broken down and burned.

9. L'augmentation de la température de
When the low-frequency transformateur is put into operation, the part where the coil temperature is higher than the ambient temperature is called the coil temperature rise.
La partie du cœur où la température de fonctionnement dépasse la température ambiante est appelée échauffement du cœur.
Il existe deux types d'élévation de température : l'élévation de température la plus élevée et l'élévation de température moyenne.
Generally, the average temperature rise of the coil is taken as the temperature rise index of the low-frequency transformateur.
Temperature rise is an important factor affecting the life of low-frequency transformateur.
The allowable temperature rise of a low-frequency transformateur is determined by its insulation and heat resistance class.