Date Code 990215 Trip and Target Logic 5-25
SEL-351P Manual Técnico
External Inputs
See Optoisolated Inputs in Section 7: Inputs, Outputs, Timers, and Other Control Logic for
more information on optoisolated inputs.
BT – Received Block Trip Signal(s)
In two-terminal line DCB applications, a block trip signal is received from one
remote terminal.
One optoisolated input on the SEL-351P (e.g., input IN104) is driven by a communications
equipment receiver output (see
Figure SECTION 5: .15). Make SEL
OGIC
Control Equation
setting BT:
BT = IN104 (two-terminal line application)
In three-terminal line DCB applications, block trip signals are received from two
remote
terminals. Two optoisolated inputs on the SEL-351P (e.g., input IN104 and IN106) are driven by
communications equipment receiver outputs (see
Figure SECTION 5: .16). Make SEL
OGIC
Control Equation setting BT as follows:
BT = IN104 + IN106 (three-terminal line application)
SEL
OGIC
Control Equation setting BT is routed through a dropout timer (BTXD) in the DCB
logic in
Figure SECTION 5: .14. The timer output, Relay Word bit BTX, is routed to the trip
logic in
Figure SECTION 5: .1.
Timer Settings
See Section 9: Setting the SEL-351P Recloser Control for setting ranges.
Z3XPU – Zone (Level) 3 Reverse Pickup Time Delay
Current-reversal guard pickup timer – typically set at 1 cycle.
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.
67P2SD, 67N2SD, 67G2SD, 67Q2SD – Level 2 Short Delay
Carrier coordination delays for the output of Level 2 overreaching overcurrent elements 67P2S,
67N2S, 67G2S, and 67Q2S, respectively – typically set at 1 cycle.
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