Sel 411L - Table 4.22 Circuit Breaker BK2 Modes of Operation

P.4.25
Date Code 20151029 Protection Manual SEL-411L Relay
Autoreclosing and Synchronism-Check
Two-Circuit-Breaker Autoreclosing
E3PR2 is the SELOGIC control equation that enables three-pole autoreclose
for Circuit Breaker BK2. You can assign this setting to a control input. ESPR2
is the SEL
OGIC control equation that enables single-pole autoreclose for
Circuit Breaker BK2. You can assign this setting to a control input.
When ESPR2 equals logical 1, the relay can attempt a single-pole autoreclose
cycle for Circuit Breaker BK2. If ESPR2 equals logical 0, the relay cannot
initiate a single-pole autoreclose cycle for Circuit Breaker BK2.
When E3PR2 equals logical 1, the relay can attempt a three-pole autoreclose
cycle for Circuit Breaker BK2. If E3PR2 equals logical 0, the relay goes to
lockout following a three-pole trip for Circuit Breaker BK2.
Assert one or all SEL
OGIC control equations E3PR1, E3PR2, ESPR1, and
ESPR2 according to your reclosing requirements.
For single-pole reclosing, set ESPR1 := 1 and set NSPSHOT to the number of
single-pole reclose shots you want. For three-pole reclosing, set E3PR1 := 1
and set N3PSHOT for the number of three-pole shots you want. For both
single-pole and three-pole reclosing, set ESPR1 := 1, E3PR1 := 1, and
configure settings NSPSHOT and N3PSHOT for the number of reclose shots
of each type that you want (see Recloser Mode Enables).
EXAMPLE 4.1 Conditional Three-Pole Tripping for Circuit Breaker
BK2
Your system reclosing requirement is that Circuit Breaker BK2 always
three-pole trips, unless Circuit Breaker BK2 is the leader. (This occurs
when Circuit Breaker BK1 is out of service.) Program SEL
OGIC control
equation ESPR2 as follows:
ESPR2 := LEADBK2 AND BK1LO Single-Pole Reclose Enable—BK2 (SELOGIC Equa-
tion)
Trip Logic and
Reclose Sources
Internal Recloser
Program the recloser function to drive the trip logic with Relay Word bits
R3PTE (Recloser Three-Pole Trip Enable), R3PTE1 (Circuit Breaker BK1
Recloser Three-Pole Trip Enable) and R3PTE2 (Circuit Breaker BK2
Recloser Three-Pole Trip Enable) as follows:
E3PT := R3PTE Three-Pole Trip Enable (SELOGIC Equation)
E3PT1 := R3PTE1 Breaker 1 Three-Pole Trip (SELOGIC Equation)
E3PT2 := R3PTE2 Breaker 2 Three-Pole Trip (SELOGIC Equation)
These settings connect the internal relay recloser for both three-pole reclosing
and single-pole reclosing.
Table 4.22 Circuit Breaker BK2 Modes of Operation
E3PR2 ESPR2 Result
0 0 Autoreclose disabled
0 1 Single-pole autoreclose only enabled
1 0 Three-pole autoreclose only enabled
1 1 Single- and three-pole autoreclose enabled