低周波トランスの主なパラメータ

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1.電圧比

の 2 グループの数を設定します。 low-frequency 変成器 N1 と N2 としてコイル、N1 は一次巻線、N2 は二次巻線です。
一次巻線に交流電圧が印加され、二次コイルの両端に誘導起電力が発生します。
When N2>N1, its induced electromotive force is higher than the primary voltage added, this low-frequency 変成器 is called boost low-frequency 変成器.

2の効率。

At rated power, the ratio of the output power to the input power of the low-frequency 変成器 is called the efficiency of the low-frequency 変成器, that is, η=P2/P1×100%.
Where η is the efficiency of the low-frequency 変成器, P1 is the input power and P2 is the output power.
When the output power P2 of the low-frequency 変成器 is equal to the input power P1, the efficiency η is equal to 100%, at this time the low-frequency 変成器 will not produce any loss, but in fact this low-frequency 変成器 does not exist, low-frequency 変成器 transmission power always produce loss, this loss mainly copper loss and iron loss.
The efficiency of the low-frequency 変成器 is closely related to the power level of the low-frequency 変成器. Usually, the greater the power, the smaller the loss and the higher the efficiency.
反対に、電力が低いほど、効率は低くなります。

3.作業頻度

Because the low frequency 変成器 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. 定格電圧

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

5.定格電力

Rated power refers to the low frequency 変成器 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 変成器 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.無負荷電流

When the low-frequency 変成器 secondary winding open, there is still a certain current in the primary coil, this current is called no-load current.
無負荷電流は励磁電流（発生する磁束）と鉄損電流（鉄損によるもの）で構成されます。
のために low-frequency 変成器 with 50Hz power supply、無負荷電流は基本的に磁化電流に等しくなります。

7. 無負荷損失

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

8. 絶縁抵抗

This parameter represents the insulation performance between each coil of the low-frequency 変成器 and between each coil and the iron core.
絶縁抵抗は、使用する絶縁材料の性能、温度、湿度に関連しています。
Insulation resistance is a parameter that represents the insulation performance of low-frequency 変成器. 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.
絶縁抵抗が非常に大きいため、一般的に抵抗を測定するにはメガオーム メーター (またはマルチメーター R×10kΩ ブロック) しか使用できません。
If the insulation resistance of the low-frequency 変成器 is too low, the case may be charged in use and even the low-frequency 変成器 winding may be broken down and burned.

9. の温度上昇
When the low-frequency 変成器 is put into operation, the part where the coil temperature is higher than the ambient temperature is called the coil temperature rise.
動作温度が周囲温度を超えるコアの部分は、コア温度上昇と呼ばれます。
気温上昇には、最高気温上昇と平均気温上昇の2種類があります。
Generally, the average temperature rise of the coil is taken as the temperature rise index of the low-frequency 変成器.
Temperature rise is an important factor affecting the life of low-frequency 変成器.
The allowable temperature rise of a low-frequency 変成器 is determined by its insulation and heat resistance class.