GE Power Quality Meter Series Instruction Manual page 94

4.5 S4 ALARMS/CONTROL
• DETECT I/V ALARMS USING PERCENTAGE: When YES is selected, all current and voltage alarms can
be set in percentages of CT and VT. When NO is selected, all current and voltage alarms are actual voltage
and current levels.
• PHASE UNDERCURRENT RELAY: Undercurrent can either be disabled, used as an alarm or as a pro-
cess control feature. Set this setpoint to off if the feature is not required. Selecting alarm relay will cause
the alarm relay to activate and display an alarm message whenever an undercurrent condition exists.
Selecting an auxiliary relay will cause the selected auxiliary relay to activate for an undercurrent condition
but no message will be displayed. This is intended for process control.
• PHASE UNDERCURRENT LEVEL: When the average three phase current drops to or below the level set
by this setpoint, a phase undercurrent condition will occur. Refer to the DETECT UNDERCURRENT WHEN 0A
setpoint description below to enable/disable undercurrent detection below 5% of CT.
• PHASE UNDERCURRENT DELAY: If the average phase current drops to or below the PHASE UNDERCUR-
RENT LEVEL setpoint value and remains this way for the time delay programmed in this setpoint, a phase
undercurrent condition will occur.
• DETECT UNDERCURRENT WHEN 0A: If this setpoint is set to YES, undercurrent will be detected if the
average phase current drops below 5% of CT. If the setting is NO, the undercurrent detection is only
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enabled if the average phase current is equal to or above 5% of CT.
• PHASE OVERCURRENT RELAY: Overcurrent can either be disabled, used as an alarm or as a process
control. Set this setpoint to off if the feature is not required. Selecting alarm relay will cause the alarm relay
to activate and display an alarm message whenever an overcurrent condition exists. Selecting auxiliary
relay will cause the auxiliary relay to activate for an overcurrent condition but no message will be dis-
played. This is intended for process control.
• PHASE OVERCURRENT LEVEL: When the average (or maximum, see below) three phase current
equals or exceeds the level set by this setpoint, a phase overcurrent condition will occur.
• PHASE OVERCURRENT DELAY: If the average (or maximum, see below) phase current equals or
exceeds the PHASE OVERCURRENT LEVEL setpoint value and remains this way for the time delay pro-
grammed in this setpoint, a phase overcurrent condition will occur.
• PHASE OVERCURRENT ACTIVATION: The Phase Overcurrent function can use either the average
phase current or the maximum of the three phase currents. This setpoint determines which is used.
• NEUTRAL OVERCURRENT RELAY: Neutral overcurrent can either be disabled, used as an alarm or as a
process control. Set this setpoint to off if the feature is not required. Selecting alarm relay will cause the
alarm relay to activate and display an alarm message whenever a neutral overcurrent condition exists.
Selecting auxiliary relay will cause the auxiliary relay to activate for a neutral overcurrent condition but no
message will be displayed. This is intended for process control.
• NEUTRAL OVERCURRENT LEVEL: When the neutral current equals or exceeds the level set by this set-
point, a neutral overcurrent condition will occur.
NEUTRAL OVERCURRENT DELAY: If the neutral current equals or exceeds the NEUTRAL OVERCURRENT
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LEVEL setpoint value and remains this way for the time delay programmed in this setpoint, a neutral over-
current condition will occur.
• UNDERVOLTAGE RELAY: Undervoltage can either be disabled, used as an alarm or as a process control.
Set this setpoint to off if the feature is not required. Selecting alarm relay will cause the alarm relay to acti-
vate and display an alarm message whenever an undervoltage condition exists. Selecting auxiliary relay
will cause the auxiliary relay to activate for an undervoltage condition but no message will be displayed.
This is intended for process control.
• UNDERVOLTAGE LEVEL: When the voltage on one, two, or three phases drops to or below this level, an
undervoltage condition occurs. The number of phases required is determined by the PHASES REQUIRED FOR
U/V OPERATION setpoint. To clear the undervoltage condition, the level must increase to 103% of the UNDER-
4-38 PQM Power Quality Meter
4 PROGRAMMING
GE Power Management