Knowledge of voltage after capacitor is energized

If the bolt terminal is connected to 50KV high voltage, will the voltage of the lead terminal be 50KV? The answer is not yes! If the lead terminal leads directly to the ground, that is, the ground line, then the voltage on this side is also 50KV.

However, in practical applications, capacitors are often not directly conductive. For example, when used as a voltage divider (voltage sensor), it is followed by a low-voltage large-capacity capacitor, and the voltage of the lead terminal is the ratio of C2/C1. For example, the capacity of the low-voltage capacitor behind is 1000 times that of the first high-voltage capacitor, so the voltage at the lead end is 50KV/1000=50V; If the capacity ratio is 10,000 times, then the voltage on the lead is only 5V.

In the second case, the capacitor is connected to a transformer or other device. Therefore, a certain voltage division relationship will be formed, and the voltage of the lead terminal is determined by the device that is connected behind! Capacitor power supply is such a situation, the voltage behind the high-voltage capacitor is only within 3KV.

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