The main characteristics of electrolytic capacitors are: large capacitance, low voltage, low frequency, large tolerance value, large leakage current, high loss, etc. Therefore, they are widely used in fields such as power filtering, coupling and winding, timing circuits, and power voltage regulators. Due to the presence of electrolyte in electrolytic capacitors, their performance stability and lifespan are subject to certain limitations. When the electrolytic capacitor ages or malfunctions, it needs to be replaced in a timely manner. When replacing electrolytic capacitors, the following principles need to be followed:
1.電容值替換原則：將老化或故障的電解電容替換為相同的電容值的電解電容。
Principle of capacitance value replacement: Replace aged or faulty electrolytic capacitors with electrolytic capacitors with the same capacitance value.
2.電壓替換原則：電解電容的工作電壓是其最關鍵的參數之一，替換時要確保所選電解電容的工作電壓不小于原電解電容的電壓。
Principle of voltage replacement: The working voltage of an electrolytic capacitor is one of its most critical parameters. When replacing, it is necessary to ensure that the working voltage of the selected electrolytic capacitor is not less than the voltage of the original electrolytic capacitor.
3.極性替換原則：電解電容有正負兩個極性，替換時應確保所選電解電容的極性與原電解電容相同。
Polarity replacement principle: Electrolytic capacitors have two polarities, positive and negative. When replacing, it should be ensured that the polarity of the selected electrolytic capacitor is the same as the original electrolytic capacitor.
4.品質替換原則：選用品質好的電解電容，可以保證元件長期穩定運行。
Quality replacement principle: Choosing high-quality electrolytic capacitors can ensure long-term stable operation of the components.
5.實際電路的應用情況：要看實際電路應用情況，不應只看表面屬性參數，否則很容易引起電路的各種不穩定因素。
Actual circuit application situation: It should be based on the actual circuit application situation, not only on surface attribute parameters, otherwise it is easy to cause various unstable factors in the circuit.
二、替換范圍
Replace scope
1.普通電解電容
Ordinary electrolytic capacitors
普通電解電容的替換范圍比較廣泛，可以使用同樣電壓等級、相同容值、同樣極性、尺寸相同的電解電容進行替換。
The replacement range of ordinary electrolytic capacitors is relatively wide, and electrolytic capacitors with the same voltage level, capacitance value, polarity, and size can be used for replacement.
2.長壽命電解電容
Long life electrolytic capacitors
長壽命電解電容通常具有更高的工作溫度和更長的使用壽命。在替換長壽命電解電容時，需要選用額定工作溫度和壽命相同的電解電容進行替換。
Long life electrolytic capacitors typically have higher operating temperatures and longer service life. When replacing long-life electrolytic capacitors, it is necessary to choose electrolytic capacitors with the same rated operating temperature and lifespan for replacement.
3.超低阻抗電解電容
Ultra low impedance electrolytic capacitor
超低阻抗電解電容用于高頻應用，所處的工作環境也比較惡劣。在替換超低阻抗電解電容時，需要選用阻抗值相同的電解電容進行替換。
Ultra low impedance electrolytic capacitors are used in high-frequency applications and operate in harsh environments. When replacing ultra-low impedance electrolytic capacitors, it is necessary to choose electrolytic capacitors with the same impedance value for replacement.
4.鋁電解電容
Aluminum electrolytic capacitor
鋁電解電容使用范圍廣泛，替換時可以使用同樣電壓等級、相同容值、同樣極性的電解電容進行替換。
Aluminum electrolytic capacitors have a wide range of applications and can be replaced with electrolytic capacitors of the same voltage level, capacitance value, and polarity.
在實際電路中進行鋁電解電容替換的時候，首先要查明電路的需求，根據不同電路類型，遵循電解電容的替換原則，這樣才能保證電路的穩定性。
When replacing aluminum electrolytic capacitors in actual circuits, the first step is to identify the circuit requirements and follow the principle of replacing electrolytic capacitors according to different circuit types, in order to ensure the stability of the circuit.