This short-circuit protection method can be intuitively understood literally-when the actual current value in the protected object exceeds the set target value, the protector considers the line to have a short-circuit fault, and then (some protectors can also Set the operating time) to cut off the power supply.
This short-circuit protection method is only for detecting the amount of line current, so it is suitable for environments where the distance between the power supply lines is not long, the load type is relatively single, and the fluctuations are not large, such as civil distribution lines.
2. Phase-sensitive short circuit protectionIf the power supply distance of the electrical circuit we are facing is long, and there are many types of electrical loads and loads that frequently start and stop, then the short circuit protection of the amplitude discrimination method may easily cause the protector to malfunction and affect the normal power supply. quality. In this case, we have to choose a phase-sensitive short-circuit protection designed specifically for the above-mentioned situation.
Compared with the above protection method, this protection method not only simply samples the current value in the line, but also detects the circuit voltage value synchronously, and then calculates and analyzes the two power values ​​through a certain formula, which can correctly distinguish the short-circuit current in the line. And the starting current or other superimposed currents, effectively avoid unnecessary malfunctions! Due to the above-mentioned characteristics, this short-circuit protection method is currently the first for electric power lines.
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