GE PQMII, Instruction Manual

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6–28 PQMII POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 6: MONITORING
6.4.5 Voltage Disturbance
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PATH: ACTUAL VALUES
Ö
A3 POWER ANALYSIS
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VOLTAGE DIST. RECORDER
The Voltage Disturbance Recorder runs continuously and records the source, level and
duration of each voltage disturbance. Up to 500 disturbances are recorded in a circular
buffer. When over 500 disturbances are recorded, data for older disturbances are lost as
new disturbances are recorded. Additionally, since the events are stored within volatile
memory, the voltage disturbance recorder will lose all events upon a power loss. The time
and date of when the disturbance
ended
is recorded with the disturbance event. The
following available is available for each disturbance:
•
Type : Each disturbance is classified as a
SWELL
or
SAG
. The disturbance will be
distinguished as a swell if the voltage increases above the swell level, for up to 1
minute. A sag disturbance is distinguished in the same manner except that it involves
a voltage decrease below the sag level.
• Source : The source of the disturbance is the phase voltage that recorded the
disturbance; either Van, Vbn, Vcn, Vab, or Vca. If the disturbance is found on two or
more phases, multiple disturbances will be recorded.
Note
The voltage disturbance recorder monitors only measured values. Therefore, when the
Vbc (delta connection only) and Vbn (2 VT 4-Wire Wye only) phases are calculated
quantities, they are not considered a source.
UNDERCURRENT ↓ Undercurrent Alarm/Control Dropout
UNDERVOLTAGE ↑ Undervoltage Alarm/Control Pickup
UNDERVOLTAGE ↓ Undervoltage Alarm/Control Dropout
UNDRFREQUENCY
↑
Underfrequency Alarm/Control Pickup
UNDRFREQUENCY ↓ Underfrequency Alarm/Control Dropout
VOLTAGE THD ↑ Voltage THD Alarm/Control Pickup
VOLTAGE THD ↓ Voltage THD Alarm/Control Dropout
VOLTAGE U/B
↑
Voltage Unbalance Alarm/Control Pickup
VOLTAGE U/B ↓ Voltage Unbalance Alarm/Control Dropout
Table 6–1: List of Possible Events (Sheet 4 of 4)
Displayed Event Name Event Description
„
VOLTAGE DIST. [
Z
]
RECORDER
3: Van SWELL
12:00:05am 01/01/03
MESSAGE
2: Vbn SAG
12:00:02am 01/01/03
MESSAGE
1: Vcn SAG
12:00:00am 01/01/03