System Checks; System Checks Implementation; Vt Connections; Voltage Monitoring - GE P24DM Technical Manual

Chapter 13 - Monitoring and Control
9

SYSTEM CHECKS

In some situations it is necessary to check that the network conditions are suitable for some protection functions
(unbalance conditions, blocking conditions). The System Checks functionality involves monitoring the voltages on
the source side of a circuit breaker and indicate live line or dead line accordingly.
9.1

SYSTEM CHECKS IMPLEMENTATION

The System Checks function is enabled or disabled by the System Checks setting in the CONFIGURATION
column. If System Checks is disabled, the SYSTEM CHECKS menu becomes invisible, and a SysChks Inactive
DDB signal is set.
9.1.1

VT CONNECTIONS

The device provides inputs for a three-phase "Main VT" for detecting Live line/dead line condition.
9.1.2

VOLTAGE MONITORING

The settings in the VOLTAGE MONITORS sub-heading in the SYSTEM CHECKS column allow you to define the
threshold at which a voltage is considered live, and a threshold at which the voltage is considered dead. If the
measured voltage falls below the Dead Voltage setting, a DDB signal is generated (Dead Line). If the measured
voltage exceeds the Live Voltage setting, a DDB signal is generated (Live Line).
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