RCCB Nuisance Tripping Solutions
In this article, we discussed the issue of Unwanted or Nuisance Tripping RCCB. Residual Current Circuit Breaker or RCCB is basically a cut off circuit whenever an electric shock or current leakage fault occurs. The main purpose of installing an RCCB OR RCD fundamentally is to protect people from electric shocks or death caused by them. Some disturbance on the electric network, May cause RCCBs or RCD to trip and interrupt the circuit even if there is no real fault.
Main Purpose of Installing an RCCB OR RCD
Residual Current Circuit Breaker or RCCB is basically a cut off circuit whenever an electric shock or current leakage fault occurs. The main purpose of installing an RCCB OR RCD fundamentally is to protect people from electric shocks or death caused by them. Some disturbance on the electric network, May cause RCCBs or RCD to trip and interrupt the circuit even if there is no real fault.
Most Common Reason for Unwanted Tripping RCCB
1. Starting - Stopping of Big Loads:-
Operational discharges are produced by connecting or disconnecting loads (opening or closing of protection and command devices, starting and stopping of motors, switching on and off of fluorescent lighting, etc.); if conditions in the circuit are abruptly modified, this causes temporary disturbances such as impulse voltages at high frequency.
2. Direct or Indirect Lightning
Atmospheric discharges are caused by direct or indirect lightning onto the power line; when lightning strikes, it generates an electromagnetic field which produces a transient impulse voltage in the network; this generates capacitive earth leakage in the network cables. In these circumstances, the nuisance tripping of the residual current protection device is unwanted since it does not prevent the risks caused by direct and indirect contact.
A sudden and unjustified cut off of the power supply, on the other hand, may cause very serious problems and jeopardize the continuity of service of refrigerators, freezers, computers, lighting and airconditioning systems, burglar alarms, data transmission systems, etc.
Special Range of RCCBs and RCD
A special range of RCCBs and RCD designed for preventing nuisance tripping like the AP range of ABB RCCBs pass the ring wave test at 0.5 µs/100 kHz and also withstand the 8/20 µs impulse with the same peak current of 3000 A prescribed for selective devices.
For this reason, they offer the most direct solution to the problem of unwanted tripping caused by atmospheric or operational discharges. The electronic components they are equipped with are capable of distinguishing between temporary leakage caused by network disturbances and permanent leakage caused by actual faults and only open the circuit if the latter occurs. A slight delay in the tripping time has also been introduced into the AP range of RCCBs and RCD blocks which nevertheless respects the safety limits imposed by the standards
SPD for preventing nuisance tripping of RCCB Or ELCB
Use of Type 1 & 2 SPD in the Energy meter side before DB and RCCB in the system can provide effective and extensive protection in a cascaded system. Use of SPD incoming before RCCB in the system and SPD before the load can provide effective and extensive protection in a cascaded system.
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