Reset Cb Lockout Logic Diagram; Application Notes; Setting The Thresholds For The Total Broken Current; Figure 233: Reset Circuit Breaker Lockout Logic Diagram (Modules 57 & 58) - GE MiCOM P40 Technical Manual

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RESET CB LOCKOUT LOGIC DIAGRAM

Res LO by CB IS

Res LO by UI

Reset CB1 LO

Res LO by NoAR

Res LO by ExtDDB

Rst CB1 Lockout

Res LO by TDelay

LO Reset Time

CB1 AR Lockout

Res LO by CB IS

Res LO by UI

Reset CB2 LO

Res LO by NoAR

Res LO by ExtDDB

Rst CB2 Lockout

Res LO by TDelay

LO Reset Time

CB2 AR Lockout

Figure 233: Reset Circuit Breaker Lockout Logic Diagram (Modules 57 & 58)

Where power lines use oil circuit breakers (OCBs), changing of the oil accounts for a significant proportion of the

switchgear maintenance costs. Often, oil changes are performed after a fixed number of CB fault operations.

However, this may result in premature maintenance where fault currents tend to be low, because oil degradation

may be slower than would normally be expected. The Total Current Accumulator (I^ counter) cumulatively stores

the total value of the current broken by the circuit breaker providing a more accurate assessment of the circuit

breaker condition.

P446SV-TM-EN-1

Chapter 16 - Monitoring and Control