FANOX SILA OVERCURRENT AND EARTH FAULT RELAY - FANOX SILA

Overcurrent protection
Function 50P
Instantaneous phase overcurrent
Function 50N
Instantaneous neutral overcurrent
Function 51P
Inverse time phase overcurrent
Function 51N
Inverse time neutral overcurrent
Function 46
Inverse time negative sequence overcurrent
Overvoltage protection
Function 59P
Defined time phase overvoltage
Function 59N
Defined time neutral overvoltage
Undervoltage protection
Function 27P
Defined time phase undervoltage
Directional Power protection
Function 32/40
Defined time directional power
Recloser
Function 79
This function is the responsible of reclosing the breaker when
a fault occurs.
Phase directional protection
Function 67P
It uses the voltage between phases as the polarization
magnitude and the phase current as the operating variable.
If the directional function 67P is not enabled, it behaves as a
51/50P function. The operative time starts when the following
conditions are met simultaneously:
- Polarization voltage higher than setting
- Phase current higher than setting
- Gap between phase current and polarization voltage
is such that the phase current is within the area of the
intervention.
Neutral directional protection
Function 67N
It uses the residual voltage as the polarization magnitude and
the residual current as the operating variable. If the directional
function 67N is not enabled, it behaves as a 51/50N function.
The operative time starts when the following conditions are met
simultaneously:
- Residual voltage higher than setting
- Residual current higher than setting
- Gap between residual current and residual voltage is
such that the residual current is within the area of the
intervention.
Additional Functions
Function 52
This function allows monitoring of circuit breaker state and
makes a preventive maintenance.
Function 50BF
This function allows showing a possible error of the circuit
breaker opening.
Function 74CS
This function allows the supervision of breaker’s trip circuit.
CLP
This unit is used in order to avoid non-desirable operations of
overcurrent functions when the line is not energized.