Sel 411L - One-Circuit-Breaker Autoreclosing

P.4.4
SEL-411L Relay Protection Manual Date Code 20151029
Autoreclosing and Synchronism-Check
One-Circuit-Breaker Autoreclosing
Figure 4.1 Autoreclose State Diagram for Circuit Breaker 1
One-Circuit-Breaker Autoreclosing
Modes
The autoreclose logic operates in three modes:
➤ Single-pole mode (SPAR)
➤ Three-pole mode (3PAR)
➤ Single- and three-pole mode (SPAR/3PAR)
Relay settings ESPR1 (Single-Pole Reclose Enable—BK1) and E3PR1
(Three-Pole Reclose Enable—BK1) determine the autoreclose mode (see
Recloser Mode Enables). These settings are inputs to the recloser initiation
Relay Word bits SPARC (Single-Pole Reclose Initiate Qualified) and 3PARC
(Three-Pole Reclose Initiate Qualified); see Figure 4.8 and Figure 4.9.
SPARC asserts when all necessary conditions to begin a single-pole
autoreclose cycle are satisfied (ESPR1, for example) and the recloser receives
a single-pole reclose initiation SPRI (see Figure 4.8). Relay Word bit 3PARC
asserts when all necessary conditions to begin a three-pole autoreclose cycle
are satisfied (E3PR1, for example) and the recloser receives a three-pole
reclose initiation 3PRI (see Figure 4.9).
Other recloser settings include the initial recloser settings (see Enable
Autoreclose Logic for Two Circuit Breakers) and the trip logic enable settings
E3PT, E3PT1, and E3PT2. When SEL
OGIC control equations E3PT, E3PT1,
Table 4.1 Autoreclose Logical States for Circuit Breaker 1
State Description Relay Word Bit
Start Turn on, or relay settings change 79STRT
Reset Circuit Breaker 1 reset BK1RS
Single-pole autoreclose cycle Single-pole autoreclose 79CY1
Three-pole autoreclose cycle Three-pole autoreclose cycle 79CY3
Lockout Lockout BK1LO
79CY1
79CY3
79STRT
BK1LO
Breaker 1
Reset or
Ready
Breaker 1
Lockout
1-Pole
Auto-Reclose
Start
3-Pole
Auto-Reclose
BK1RS