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CHAPTER 11
P
ROGRAMMING
G
ROUP
7: P
HASE
R
EVERSAL
& P
HASE
I
MBALANCE
S
ET
L
IMITS
/R
ELAYS
11.1 V
OLTAGE
P
HASE
R
EVERSAL AND
P
HASE
I
MBALANCE
The set limit alerts the user of an unbalanced or a reversed phase in a Three-phase System. The EPM3000P has two
options for this purpose.
PHASE REVERSAL:
Activates when a reversed phase enters the EPM3000P’s metering system.
PERCENT PHASE IMBALANCE:
Activates when the user’s present value percent phase imbalance is exceeded. For example: an unbalanced Three-
phase System.
D
IAGRAM
11.1: E
XAMPLE OF
S
ET
L
IMITS
10:00 AM 11:00 AM
Limits Not
Triggered
Limits Triggered
PHASE
IMBALANCE
(% )
10.0%
THREE PHASE SYSTEM IMBALANCE
11.2 T
RIP
R
ELAY
NOTE:
T
HE
-NL
OPTION MUST BE PURCHASED TO HAVE RELAYS TRIGGERED FROM
L
IMIT
C
ONDITIONS
.
The EPM3000P has two Relays. These relays are linked through the program to Set Limits LM1 and LM2. The user
can program above or below set limits for every reading. When a measurement exceeds a particular value, the set
limit triggers and alerts the user. Each relay has provisions for a separate delay time (see Chapter 8).
c
TRIP RELAY I
Whether to trip Relay 1.
d
TRIP RELAY II
Whether to trip Relay 2.
e
LEVEL
The level at which the warning mechanism trips. Percentage of voltage imbalance is
entered for setup level.
-
OR
-
f
ENABLE/DISABLE
In the event of Phase Reversal, indicates whether to enable or disable phase reversal
detection.
T
ABLE
11-0: G
ROUP
7 P
ROGRAMMING
F
ORMAT
FUNCTION NUMBER FUNCTION
0. Voltage Phase Reversal Detection
1. Voltage Phase Imbalance
E. Exit Programming GROUP 7
38
GE Industrial Systems