Areva MiCom P120, Technical Manual

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User Guide P12x/EN FT/A96
MiCOM P121/P122/P123
Page 63/72
5.9.16 Submenu Logic Equations ( P121, P122 & P123 only)
With the Logic Equations submenu, it is possible to form up to 8 complex Boolean functions
using NOT, AND and OR operators (indicated from highest to lowest priority). Up to 16
operands can be used in any single equation. The following logic signals are available for
mapping to an equation:
TEXT Information
I> Instantaneous first phase threshold
I>>
Instantaneous second phase threshold
I>>> Instantaneous third phase threshold
tI>
Time delayed first phase threshold
tI>>
Time delayed second phase threshold
tI>>> Time delayed third phase threshold
Ie>
Instantaneous first earth threshold
Ie>> Instantaneous second earth threshold
Ie>>> Instantaneous third earth threshold
tIe>
Time delayed first earth threshold
tIe>> Time delayed second earth threshold
tIe>>>
Time delayed third earth threshold
t Aux 1 Copy of the status of the Logic Input delayed by t Aux 1
t Aux 2 Copy of the status of the Logic Input delayed by t Aux 2
Brkn Cond.
Broken conductor detection
CB Fail Detection of a Circuit Breaker failure (CB not open at the end
of tBF timer)
I2>
Instantaneous first phase negative sequence threshold
I2>> Instantaneous second phase negative sequence threshold
tI2>
Time delayed negative phase sequence (1
st
threshold)
tI2>> Time delayed negative phase sequence (2
nd
threshold)
Thermal Alarm Thermal alarm output signal
Therm Trip
Trip on Thermal overload
I< Instantaneous undercurrent threshold
tI<
Time delayed undercurrent
t Aux 3 Copy of the status of the Logic Input delayed by t Aux 3
tBC Time delayed broken conductor
79 Trip
Autoreclose final trip
t Aux 4 Copy of the status of the Logic Input delayed by t Aux 4
Only available in model MiCOM P122 and P123
Only available in model MiCOM P123