How does the leakage protection function of the ps control cabinet work, and can it minimize the risk of electric shock?
Publish Time: 2024-12-24
The leakage protection function in the ps control cabinet is mainly realized by the leakage protector (residual current circuit breaker or residual current operated protector, RCD or RCCB). The core function of the leakage protector is to quickly cut off the power supply when a leakage fault is detected in the circuit, thereby reducing the risk of electric shock accidents.
1. Working principle of leakage protector
Current detection: There is a current transformer inside the leakage protector, which can detect the balance of the inflow and outflow currents in all circuit loops passing through the control cabinet.
Unbalance detection: In normal circuit operation, the current of the phase line (live wire) and the neutral line should be balanced. If leakage occurs, the current between the two will be unbalanced. This imbalance is detected by the zero-sequence transformer.
Trigger threshold: Once the detected unbalanced current exceeds the set threshold, the leakage protector will respond quickly, usually disconnecting the power supply within a few milliseconds to prevent electric shock accidents.
2. Ways to reduce the risk of electric shock
Quickly cut off the power supply: The leakage protector can cut off the power supply almost immediately when it detects leakage, greatly reducing the risk of electric shock and preventing the current from passing through the human body.
High sensitivity: Modern leakage protectors have high sensitivity and can detect very small leakage currents (such as 30mA), which is sufficient to protect personnel safety in many application scenarios.
Multiple protections: In addition to the leakage protector, the ps control cabinet is usually equipped with other safety devices, such as overload protection, short-circuit protection, etc., which work together to provide more comprehensive electrical safety protection.
Regular inspection and maintenance: Regular inspection and maintenance of the leakage protector and the entire power system to ensure that all equipment is working properly can further improve safety.
Through the above measures, the leakage protection function in the ps control cabinet can effectively reduce the risk of electric shock and protect personnel safety. However, no matter how good the protection measures are, they cannot be separated from correct use and maintenance. Therefore, when using electrical equipment, always follow the safe operating procedures.
