Voltage Phase Reversal And Imbalance - GE EPM 5300 Instruction Manual

MAX
MIN
LM1
LM2
KVAH KWH
MAX/MIN
VOLTS
LIMITS

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.
AC VOLTS
MAX
B C
A C A B
MIN
N N N B C A
LM1
LM2
AC AMPS
A B C N
POWER
PF
KW
KVA
FREQ KVAR
KVAH KWH
MAX/MIN PHASE
POWER
VOLTS AMPS
LIMITS
NEXT
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.)
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.
GE Multilin
AC VOLTS
A B C A B C
N N N B C A
AC AMPS
A B C N
POWER
PF
KW
KVA
FREQ KVAR
PHASE
POWER
AMPS
NEXT
AC VOLTS
MAX
A B C A B C
MIN
N N N B C A
LM1
LM2
AC AMPS
A C N
B
POWER
PF
KW
KVA
KVAH KWH FREQ KVAR
PHASE
MAX/MIN
POWER
VOLTS AMPS
LIMITS
NEXT
Step 2:
a. Press PHASE/NEXT
to select zero.
EPM 5000 series Advanced Power Meters
a. To access the set limit, press MAX/MIN/LIMITS
•
3 times for LM1
•
4 times for LM2
AC VOLTS
MAX
A B C A B C
MIN
N N C A
N B
LM1
LM2
AC AMPS
A B C N
POWER
PF
KW
KVA
KVAH KWH FREQ KVAR
MAX/MIN PHASE
POWER
VOLTS AMPS
LIMITS
NEXT
! This display
indicates a Voltage
Phase Reversal.
CHAPTER 5: OVERVIEW
AC VOLTS
MAX
A B C A B
MIN
N N C
N B
LM1
LM2
AC AMPS
A B C N
POWER
PF
KW
KVA
KVAH KWH FREQ KVAR
MAX/MIN PHASE
POWER
VOLTS AMPS
LIMITS
NEXT
! This display
indicates a Voltage
Phase Imbalance.
C
A
33