GE D60 Instruction Manual page 160

5.4 FLEXLOGIC™
and each preceding parameter decremented by one in turn. Until accustomed to using FlexLogic™, it is suggested that
a worksheet with a series of cells marked with the arbitrary parameter numbers be prepared, as shown below.
5. Following the procedure outlined, start with parameter 99, as follows:
99: The final output of the equation is Virtual Output 3, which is created by the operator "= Virt Op n". This parameter
is therefore "= Virt Op 3."
98: The gate preceding the output is an AND, which in this case requires two inputs. The operator for this gate is a 2-
input AND so the parameter is "AND(2)". Note that FlexLogic™ rules require that the number of inputs to most
types of operators must be specified to identify the operands for the gate. As the 2-input AND will operate on the
5
two operands preceding it, these inputs must be specified, starting with the lower.
97: This lower input to the AND gate must be passed through an inverter (the NOT operator) so the next parameter is
"NOT". The NOT operator acts upon the operand immediately preceding it, so specify the inverter input next.
96: The input to the NOT gate is to be contact input H1c. The ON state of a contact input can be programmed to be
set when the contact is either open or closed. Assume for this example the state is to be ON for a closed contact.
The operand is therefore "Cont Ip H1c On".
95: The last step in the procedure is to specify the upper input to the AND gate, the operated state of digital element 2.
This operand is "DIG ELEM 2 OP".
Writing the parameters in numerical order can now form the equation for VIRTUAL OUTPUT 3:
[95] DIG ELEM 2 OP
[96] Cont Ip H1c On
[97] NOT
[98] AND(2)
[99] = Virt Op 3
It is now possible to check that this selection of parameters will produce the required logic by converting the set of parame-
ters into a logic diagram. The result of this process is shown below, which is compared to the Logic for Virtual Output 3 dia-
gram as a check.
6. Repeating the process described for VIRTUAL OUTPUT 3, select the FlexLogic™ parameters for Virtual Output 4.
5-70
01
02
03
04
05
97
98
99
Figure 5–31: FLEXLOGIC™ WORKSHEET
FLEXLOGIC ENTRY n:
95
DIG ELEM 2 OP
FLEXLOGIC ENTRY n:
96
Cont Ip H1c On
FLEXLOGIC ENTRY n:
97
NOT
FLEXLOGIC ENTRY n:
98
AND (2)
FLEXLOGIC ENTRY n:
99
=Virt Op 3
Figure 5–32: FLEXLOGIC™ EQUATION FOR VIRTUAL OUTPUT 3
D60 Line Distance Relay
827029A1.VSD
VIRTUAL
AND
OUTPUT 3
827030A2.VSD
5 SETTINGS
GE Multilin