Figure 138: Trip On Close Logic; Trip On Close Schemes - GE MiCOM P40 Agile Technical Manual

Single breaker current differential (with distance)

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Logic is provided for situations where special tripping may be necessary following closure of the associated circuit

breaker. Two cases of Trip on Close (TOC) logic are catered for:

Switch on to Fault (SOTF).

Trip on Reclose (TOR)

SOTF provides instantaneous operation of selected elements if a fault is present when manual closure of the circuit

breaker is performed.

TOR provides instantaneous operation of selected elements if a persistent fault is present when the circuit breaker

attempts autoreclosure

The SOTF and TOR functions are known as Trip on Close logic. Both methods operate in parallel if mapped to the

SOTF and TOR Tripping matrix in the setting file.

The settings for Switch on to Fault (SOTF) and Trip on Reclose (TOR) are located in the TRIP ON CLOSE section of the

SCHEME LOGIC column.

SOTF and TOR are complemented by Current No Voltage level detectors (also known as CNV level detectors). These

CNV level detectors are set using the voltage and current settings located in the CB FAIL & P.DEAD column. The

same settings are used for pole dead logic detection. A 20ms time delay in the logic avoids a possible race

between very fast overvoltage and undercurrent level detectors.

The following figures show the Trip On Close function in relation to the Distance zones and the Trip On Close

function when driven by Current No Volt level detectors.

Any Pole Dead

TOC Reset Delay

Inhibit SOTF

All Poles Dead

Enabled PoleDead

En Pdead + Pulse

Enabled ExtPulse

Figure 138: Trip On Close logic

P54x1i-TM-EN-1

Chapter 9 - Non-Aided Schemes

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