5.26
SEL-311C Relay Instruction Manual Date Code 20060320
Trip and Target Logic
Directional Comparison Blocking Logic
Z3XPU—Zone (Level) 3 Reverse Pickup Time Delay
Current-reversal guard pickup timer—typically set at 2 cycles.
Z3XD—Zone (Level) 3 Reverse Dropout Extension
Current-reversal guard dropout timer—typically set at 5 cycles.
BTXD—Block Trip Receive Extension
Sets reset time of block trip received condition (BTX) after the reset of block
trip input BT.
21SD and 67SD—Zone 2 Short Delay
Carrier coordination delays for the output of Zone 2 overreaching distance
elements 21SD and 67SD are typically set at 1 cycle.
Logic Outputs
The following logic outputs can be tested by assigning them to output
contacts. See Output Contacts on page 7.32 for more information on output
contacts.
DSTRT—Directional Carrier Start
Program an output contact for directional carrier start. For example, SELOGIC
control equation setting OUT105 is set:
OUT105 = DSTRT
Output contact OUT105 drives a communications equipment transmitter input
in a two-terminal line application (see Figure 5.15).
In a three-terminal line scheme, output contact OUT106 is set the same as
OUT104 (see Figure 5.16):
OUT106 = DSTRT
DSTART includes current reversal guard logic.
NSTRT—Nondirectional Carrier Start
Program an output contact to include nondirectional carrier start, in addition
to directional start. For example, SEL
OGIC control equation setting OUT105 is
set:
OUT105 = DSTRT + NSTRT
Output contact OUT105 drives a communications equipment transmitter input
in a two-terminal line application (see Figure 5.15).
In a three-terminal line scheme, output contact OUT106 is set the same as
OUT104 (see Figure 5.16):
OUT106 = DSTRT + NSTRT
STOP—Stop Carrier
Program to an output contact to stop carrier. For example, SELOGIC control
equation setting OUT106 is set:
OUT106 = STOP
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