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5–40 EPM 5300 SERIES ADVANCED POWER METERS – INSTRUCTION MANUAL
VOLTAGE PHASE REVERSAL AND IMBALANCE CHAPTER 5: OVERVIEW
5.9 Voltage Phase Reversal and Imbalance
In a three-phase power distribution system, normal phase shift between each line is 120°.
If the EPM 5300P detects an abnormality, it displays a message of PH. The EPM 5200P
does not have this feature.
VOLTAGE PHASE REVERSAL: If there is an incorrect connection, such as mistaking line A for
line B, a PH message appears. The correct sequence is a-b-c.
VOLTAGE PHASE IMBALANCE LIMIT: This is detected using the phase imbalance limit in
the Programming Mode. The phase imbalance is expressed as a percentage, with 0%
indicating a 120° phase shift between each line. A PH message appears if the limit is
exceeded.
Note
In the event Voltage Phase Reversal and Voltage Phase Imbalance occur simultaneously,
the display alternates between the incorrect phase sequence and the exceeded limit
percentage. After six seconds the display returns to the normal operating mode.
Step 1:
a. Press and hold down
PHASE/NEXT. While
holding down PHASE/
NEXT, press AMPS to
access the display.
(PH indicates both
Voltage Phase Reversals
and Voltage Phase
Imbalances.)
Step 2:
a. Press PHASE/NEXT to
select zero.
This display indicates a
Voltage Phase Reversal.
This display indicates a
Voltage Phase Imbalance.
MAX/MIN
LIMITS
KVAR
PF
KW
KVA
FREQ
KWH
KVAH
AC VOLTS
AC AMPS
POWER
NC
B
A
MAX
MIN
A
N
B
N
C
N
A
B
B
C
C
A
LM2
LM1
NEXT
PHASE
VOLTS
AMPS
POWER
MAX/MIN
LIMITS
KVAR
PF
KW
KVA
FREQ
KWH
KVAH
AC VOLTS
AC AMPS
POWER
NC
B
A
MAX
MIN
A
N
B
N
C
N
A
B
B
C
C
A
LM2
LM1
NEXT
PHASE
VOLTS
AMPS
POWER
MAX/MIN
LIMITS
KVAR
PF
KW
KVA
FREQ
KWH
KVAH
AC VOLTS
AC AMPS
POWER
NCBA
MAX
MIN
A
N
B
N
C
N
A
B
B
C
C
A
LM2
LM1
NEXT
PHASE
VOLTS
AMPS
POWER
MAX/MIN
LIMITS
KVAR
PF
KW
KVA
FREQ
KWH
KVAH
AC VOLTS
AC AMPS
POWER
NCBA
MAX
MIN
A
N
B
N
C
N
A
B
B
C
C
A
LM2
LM1
NEXT
PHASE
VOLTS
AMPS
POWER