GE Power Management
PQM Power Quality Meter
5-5
5 MONITORING
5.2 A1 METERING
5
Van, Vbn, Vcn, VOLTAGE: Displays each phase voltage corresponding to the A, B, and C voltage inputs. This
voltage will be measured correctly only if the
VT RATIO
,
VT NOMINAL SECONDARY
, and
VOLTAGE WIRING
setpoint
values match the installed VTs. If the displayed voltage does not match the actual voltage, check the setpoints
and wiring. This message appears only if the
VT WIRING
is configured for a wye input.
Iavg/Vavg: Displays the average of the three phase currents/voltages. This value is not visible if the
VT WIRING
setpoint is set to
SINGLE PHASE DIRECT
.
L-N
is displayed when
VT WIRING
is set to
4 WIRE WYE (3 VTs)
,
4 WIRE WYE
DIRECT
,
4 WIRE WYE (2 VTs)
, or
3 WIRE DIRECT
and
L-L
is displayed when
VT WIRING
is set to
3 WIRE DELTA (2 VTs)
.
Vab, Vbc, Vca, VOLTAGE: Displays each line voltage corresponding to the A, B, and C voltage inputs. The
measured voltage is correct only if the
VT RATIO
,
VT NOMINAL SECONDARY
, and
VOLTAGE WIRING
setpoints match
the installed VTs. If the displayed voltage does not match the actual voltage, check the setpoints and wiring.
AVERAGE LINE VOLTAGE: Displays the average of the three line voltages. This value is not visible if the
VT
WIRING
setpoint is set to
SINGLE PHASE DIRECT
.
VOLTAGE UNBALANCE: Displays the percentage voltage unbalance. Voltage unbalance is calculated as
shown below. If the
VOLTAGE WIRING
is configured for a
WYE
input, voltage unbalance is calculated using phase
quantities. If the
VT WIRING
is configured as a
DELTA
input, voltage unbalance is calculated using line voltages.
where:
V
av
= average phase voltage = (
V
an
+
V
bn
+
V
cn
) / 3 for
WYE
and
3 WIRE DIRECT
connections
= average line voltage (
V
ab
+
V
bc
+
V
ca
) / 3 for
3 WIRE DELTA/2 VTs
connection
V
m
= voltage in a phase (or line) with maximum deviation from
V
av
,
Even though it is possible to achieve unbalance greater than 100% with the above formula, the PQM
will limit unbalance readings to 100%.
If the average voltage is below 10% of
VT RATIO
×
VT NOMINAL SECONDARY VOLTAGE
for
3 WIRE DELTA/2 VTs
,
4 WIRE
WYE/3 VTs
, and
4 WIRE WYE/2 VTs
connections, or below 10% of
VT RATIO
×
NOMINAL DIRECT INPUT VOLTAGE
for
4
WIRE WYE/DIRECT
and
3 WIRE DIRECT
connections, the unbalance reading is forced to 0%. This is implemented to
avoid nuisance alarms when the system is lightly loaded. If the simulation voltages are being used, the unbal-
ance is never forced to 0%.
Van, Vbn, Vcn MINIMUM: Displays the minimum phase voltage magnitudes and the time and date of their
occurrence. This information is stored in non-volatile memory and is retained during loss of control power. The
S1 PQM SETUP \ CLEAR DATA \ CLEAR MIN/MAX VOLTAGE VALUES
setpoint clears these values.
Vab, Vbc, Vca MINIMUM: Displays the minimum line voltage magnitudes and the time and date of their occur-
rence. This information is stored in non-volatile memory and is retained during loss of control power. The
S1
PQM SETUP \ CLEAR DATA \ CLEAR MIN/MAX VOLTAGE VALUES
setpoint clears these values.
V U/B MINIMUM: Displays minimum voltage unbalance and the time and date of its measurement. This infor-
mation is stored in non-volatile memory and is retained during loss of control power. This value is cleared with
the
S1 PQM SETUP \ CLEAR DATA \ CLEAR MIN/MAX VOLTAGE VALUES
setpoint.
Van, Vbn, Vcn MAXIMUM: Displays the maximum phase voltage magnitudes and the time and date of their
occurrence. This information is stored in non-volatile memory and is retained during loss of control power. The
S1 PQM SETUP \ CLEAR DATA \ CLEAR MIN/MAX VOLTAGE VALUES
setpoint clears these values.
Vab, Vbc, Vca MAXIMUM: Displays the maximum line voltage magnitudes and the time and date of their
occurrence. This information is stored in non-volatile memory and is retained during loss of control power. The
S1 PQM SETUP \ CLEAR DATA \ CLEAR MIN/MAX VOLTAGE VALUES
setpoint clears these values.
V U/B MAXIMUM: Displays the maximum voltage unbalance and the time and date of its measurement. This
information is stored in non-volatile memory and is retained during loss of control power. The value is cleared
with the
S1 PQM SETUP \ CLEAR DATA \ CLEAR MIN/MAX VOLTAGE VALUES
setpoint.
V
m
V
av
–
V
av
--------------------------
100%
×
NOTE
Содержание Power Quality Meter Series
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Страница 10: ...vi PQM Power Quality Meter GE Power Management TABLE OF CONTENTS ...
Страница 29: ...GE Power Management PQM Power Quality Meter 2 5 2 INSTALLATION 2 2 ELECTRICAL 2 Figure 2 3 REAR TERMINALS ...
Страница 46: ...2 22 PQM Power Quality Meter GE Power Management 2 2 ELECTRICAL 2 INSTALLATION 2 ...
Страница 56: ...3 10 PQM Power Quality Meter GE Power Management 3 4 DEFAULT MESSAGES 3 OPERATION 3 ...
Страница 166: ...6 20 PQM Power Quality Meter GE Power Management 6 6 POWER ANALYSIS 6 SOFTWARE 6 ...
Страница 274: ...B 4 PQM Power Quality Meter GE Power Management B 1 TABLES AND FIGURES APPENDIXB B ...
Страница 276: ...C 2 PQM Power Quality Meter GE Power Management C 1 PQM WARRANTY APPENDIXC C ...
Страница 281: ...GE Power Management PQM Power Quality Meter NOTES ...