Residual Current detector principle of operation and uses
Residual Current Detector:- Residual current detector works on the principle that amount of current flowing through phase should return through neutral as both phase and neutral are connected to RCD’s . RCD detects any mismatch between two currents that is through phase and neutral. RCD tripping value is usually in milliamp and mostly available in 30mA and 100 mA tripping range. If a house has an earth system connected to an earth rod and not the main incoming cable, then it must have all circuits protected by an RCD A current flow of 30 mA is sufficiently small that it makes it very difficult to receive a dangerous shock. Even 100 mA is a relatively small figure when compared to the current that may flow in an earth fault without such protection. The residual current device – principle of operation The residual current devices monitor the current flowing in a circuit by means of a torroid, which is a small current transformer specially designed to detect earth fault currents. All l