Hauptparameter des Niederfrequenztransformators

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1. Das Spannungsverhältnis

Legen Sie die Anzahl von zwei Gruppen von fest low-frequency Transformator Spulen als N1 und N2, N1 ist die Primärwicklung, N2 ist die Sekundärwicklung.
An die Primärwicklung wird eine Wechselspannung angelegt und an beiden Enden der Sekundärspule wird eine induzierte elektromotorische Kraft erzeugt.
When N2>N1, its induced electromotive force is higher than the primary voltage added, this low-frequency Transformator is called boost low-frequency Transformator.

Die Effizienz von 2.

At rated power, the ratio of the output power to the input power of the low-frequency Transformator is called the efficiency of the low-frequency Transformator, that is, η=P2/P1×100%.
Where η is the efficiency of the low-frequency Transformator, P1 is the input power and P2 is the output power.
When the output power P2 of the low-frequency Transformator is equal to the input power P1, the efficiency η is equal to 100%, at this time the low-frequency Transformator will not produce any loss, but in fact this low-frequency Transformator does not exist, low-frequency Transformator transmission power always produce loss, this loss mainly copper loss and iron loss.
The efficiency of the low-frequency Transformator is closely related to the power level of the low-frequency Transformator. Usually, the greater the power, the smaller the loss and the higher the efficiency.
Im Gegenteil, je geringer die Leistung, desto geringer der Wirkungsgrad.

3. Arbeitsfrequenz

Because the low frequency Transformator 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. Nennspannung

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

5. Nennleistung

Rated power refers to the low frequency Transformator 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 Transformator 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. Kein Laststrom

When the low-frequency Transformator secondary winding open, there is still a certain current in the primary coil, this current is called no-load current.
Der Leerlaufstrom setzt sich aus dem Magnetisierungsstrom (der einen magnetischen Fluss erzeugt) und dem Eisenverluststrom (verursacht durch Kernverlust) zusammen.
Für die low-frequency Transformator with 50Hz power supplyist der Leerlaufstrom grundsätzlich gleich dem Magnetisierungsstrom.

7. Kein Lastverlust

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

8. Isolationswiderstand

This parameter represents the insulation performance between each coil of the low-frequency Transformator and between each coil and the iron core.
Der Isolationswiderstand hängt von der Leistung, Temperatur und Feuchtigkeit des verwendeten Isolationsmaterials ab.
Insulation resistance is a parameter that represents the insulation performance of low-frequency Transformator. 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.
Da der Isolationswiderstand sehr groß ist, kann im Allgemeinen nur ein Megaohmmeter (oder Multimeter R × 10 kΩ-Block) verwendet werden, um seinen Widerstand zu messen.
If the insulation resistance of the low-frequency Transformator is too low, the case may be charged in use and even the low-frequency Transformator winding may be broken down and burned.

9. Der Temperaturanstieg von
When the low-frequency Transformator is put into operation, the part where the coil temperature is higher than the ambient temperature is called the coil temperature rise.
Der Teil des Kerns, in dem die Betriebstemperatur die Umgebungstemperatur übersteigt, wird Kerntemperaturanstieg genannt.
Es gibt zwei Arten von Temperaturanstieg: den heißesten Temperaturanstieg und den durchschnittlichen Temperaturanstieg.
Generally, the average temperature rise of the coil is taken as the temperature rise index of the low-frequency Transformator.
Temperature rise is an important factor affecting the life of low-frequency Transformator.
The allowable temperature rise of a low-frequency Transformator is determined by its insulation and heat resistance class.