Areva MiCOM P225, Technical Manual

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User Guide P225/EN FT/B11
MiCOM P225 Page 37/52
4.11.4.2.7 Auxiliary 3 and auxiliary 4 data
The “ EXT3 ” and “ EXT4 ” assignments operate similarly to “ EXT1 ” and “ EXT2 ”, but when
the associated timers expire:
−
there is no alarm message,
−
the "Alarm" led is not lit,
−
an event is recorded.
4.11.4.2.8 Thermal state reset
When a logic input is assigned to the "
θ
RESET" signal, the user can reset the thermal state
value
θ
(refer to section 4.10.1), by energising this logic input.
4.11.4.2.9 Trip circuit supervision
One or two logic inputs can be set to "TRIP CIRC" so as to be used to supervise the trip
circuit (refer to section 4.11.14.1).
4.11.4.2.10 No assignment
When a logic input is programmed on “ NONE ” (None) it becomes inactive. Whether this
logic input is switched on or not, relay P225 takes no account of it.
4.11.5 The AND LOGIC EQUAT submenu: Programmable AND logic gates
The AND LOGIC EQUAT function allows the operator to programme 4 “ AND ” logic
equations, known respectively as A, B, C and D.
Each equation can be the logic “ AND ” of one, two or several items of internal logic signals
(protection or automatism functions) or external data (state of logic inputs “ EXT 1 ”,
“ EXT2 ”, “ EXT 3 ” and “ EXT4 ”) to the relay P225.
In this menu, the user constructs each of the 4 logic equations by creating logic “ AND ” gate
between several items of data. Data is assigned to a logic equation by positioning the
corresponding digit to 1. When the digit is set at 0, the data is not assigned to the
corresponding logic equation.
Examples:
You want to create 2 “ AND ” logic equations. For the first equation, you wish to implement
the “ AND ” logic of the following data:
−
time delayed earth fault 1st element (tlo>)
−
successful start (SUCCESS START)
−
logic state of one of the binary inputs (EXT1)
&
tIo>
SUCCESS START
EXT 1
P0207ENa
For the second logic equation, you wish to implement le logic “ AND ” of the following data:
−
unbalance fault 1st element (tI2>)
−
logic state of one of the binary inputs (EXT1)
&
tIi>
EXT 1
P0208ENa