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A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage protection device, that interrupts an electrical circuit when the current passing through a conductor is not equal and opposite in both directions, therefore indicating leakage current to ground or ...
The ELCB detects fault currents between line and earth (ground) conductors within the portion of the installation it protects. If sufficient characteristics of a fault appear across the ELCB's sensing mechanism, then it will switch off the power , and remain off until manually reset.
An insulation monitoring device monitors the ungrounded system between an active phase conductor and earth.It is intended to give an alert (light and sound) or disconnect the power supply when the resistance between the two conductors drops below a set value, usually 50 kΩ (sample of IEC standard for medical applications).
Earth fault protection also requires current transformers and senses an imbalance in a three-phase circuit. Normally the three phase currents are in balance, i.e. roughly equal in magnitude. If one or two phases become connected to earth via a low impedance path, their magnitudes will increase dramatically, as will current imbalance.
60P - Phase Current Unbalance; 61 - Density Switch or Sensor; 62 - Time-Delay Stopping or Opening Relay; 63 - Pressure Switch Detector; 64 - Ground Protective Relay; 64F - Field Ground Protection; 64R – Rotor Earth Fault; 64REF – Restricted Earth Fault Differential; 64S – Stator Earth Fault; 64S - Sub-harmonic Stator Ground Protection ...
In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected. [ 1 ] : 4 The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, overvoltage , reverse power flow ...
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