6.4
SEL-400 Series Relays Instruction Manual Date Code 20171006
Autoreclosing
One-Circuit-Breaker Autoreclosing
One-Circuit-Breaker Autoreclosing
Modes
The autoreclose logic can operate in one of three modes, depending upon the
relay autoreclose capabilities:
➤ 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 on page 6.8). 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 6.8 and Figure 6.9. SPARC asserts
when all necessary conditions to begin a single-pole autoreclose cycle are satis-
fied (ESPR1, for example) and the recloser receives a single-pole reclose initia-
tion SPRI (see Figure 6.8). Relay Word bit 3PARC asserts when all necessary
conditions to begin a three-pole autoreclose cycle are satisfied (E3PR1, for exam-
ple) and the recloser receives a three-pole reclose initiation 3PRI (see
Figure 6.9).
Figure 6.1 Autoreclose State Diagram for Circuit Breaker 1
Table 6.1 Autoreclose Logical States for Circuit Breaker 1
State Description Relay Word Bit
Start Startup, or relay settings change 79STRT
Reset Circuit Breaker 1 reset BK1RS
Single-pole autoreclose cycle
a
a
79CY1 is only available in relays that support single-pole breaker operations.
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
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