GE Pqm 2 Manual

CHAPTER 5: SETPOINTS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL5–35
•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 be disabled, used as an alarm, or 
as a process control feature. Set this setpoint to “Off ” if the feature is not required. 
Selecting “Alarm” activates the alarm...

5–36PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
•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 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...

CHAPTER 5: SETPOINTS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL5–37
•PHASES REQ’D FOR U/V OPERATION: Select the minimum number of phases on which 
the undervoltage condition must be detected before the selected output relay will 
operate. This setpoint is not visible if 
VT WIRING is set to “Single Phase Direct”.
•DETECT UNDERVOLTAGE BELOW 20V: If an indication is required for loss of voltage, 
select “Yes”. If “No” is selected and any one of the voltage inputs has less than 20 V 
applied, the...

5–38PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
•VOLTAGE UNBALANCE LEVEL: When the voltage unbalance equals or exceeds this 
level, a voltage unbalance condition occurs. See 6.2.2 Voltage Metering for details on 
the method of calculation.
•VOLTAGE UNBALANCE DELAY: If the voltage unbalance equals or exceeds the 
VOLTAGE 
UNBALANCE LEVEL
 setpoint value and remains this way for the time delay programmed in 
this setpoint , a voltage unbalance condition will occur.
•VOLTAGE PHASE...

CHAPTER 5: SETPOINTS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL5–39
When the “Single Phase Direct” connection is used the phase reversal feature will never 
operate.
•VOLTAGE PHASE REVERSAL DELAY: If a voltage phase reversal exists for the time 
programmed in this setpoint a voltage phase reversal condition will occur.
NotePlease note that the terms undervoltage and overvoltage used for alarm, are generic 
regardless of sag/swell or undervotlage/overvoltage conditions based on duration of the...

5–40PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
•AVERAGE VOLTAGE THD DELAY: If the average voltage THD equals or exceeds the 
AVERAGE VOLTAGE THD LEVEL value and remains this way for the time delay programmed 
in this setpoint , an Average Voltage THD condition will occur.
5.5.3 Frequency
PATH: SETPOINTS  S4 ALARMS/CONTROL  FREQUENCY
•UNDERFREQUENCY RELAY: Underfrequency detection can either be disabled or used 
as an alarm, or process control. Set this setpoint to “Off ” if...

CHAPTER 5: SETPOINTS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL5–41
•OVERFREQUENCY DELAY: If the overfrequency equals or exceeds the OVERFREQUENCY 
LEVEL
 setpoint value for the time delay programmed in this setpoint , an overfrequency 
condition will occur.
5.5.4 Power Alarms
PATH: SETPOINTS  S4 ALARMS/CONTROL  POWER
•POWER ALARMS LEVEL BASE UNIT(S): This setpoint is used to select the base unit 
multiplier for all power alarms. When set to kW/kvar, all power alarm levels can be set 
in terms...

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CHAPTER 5: SETPOINTS
positive/negative real power but no message will be displayed. This is intended for 
process control.
•POSITIVE/NEGATIVE REAL POWER LEVEL: When the three phase real power equals or 
exceeds the level def ined by this setpoint, an excess positive/negative real power 
condition will occur.
•POSITIVE/NEGATIVE REAL POWER DELAY: If the positive/negative real power equals 
or exceeds the 
POSITIVE/NEGATIVE REAL POWER LEVEL setpoint value...

CHAPTER 5: SETPOINTS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL5–43
5.5.5 Power Factor
PATH: SETPOINTS  S4 ALARMS/CONTROL  POWER FACTOR
It is generally desirable for a system operator to maintain the power factor as close to 
unity as possible (that is, to make the real power of the system as close as possible to the 
apparent power) to minimize both costs and voltage excursions. On dedicated circuits 
such as some large motors, with a near-f ixed load, a capacitor bank may be switched on 
or...

5–44PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
advantageous to compensate for low (lagging) power factor values by connecting a 
capacitor bank to the circuit when required. The PQMII provides power factor monitoring 
and allows two stages of capacitance switching for power factor compensation.
FIGURE 5–5: Capacitor Bank Switching
The PQMII calculates the average power factor in the three phases, according to the 
following equation:
(EQ 5.2)
Two independent ‘elements’ are...