GE EPM 5350, EPM 5200, EPM 5300 instruction manual Phase Reversal and Phase Imbalance

CHAPTER 13: PHASE REVERSAL AND PHASE IMBALANCE SET RELAYS

CHAPTER 13

PHASE REVERSAL AND PHASE IMBALANCE SET LIMITS/RELAYS

13.1: Phase Reversal and Phase Imbalance

The set limit alerts the user of an unbalanced or a reversed phase in a Three-phase System. The EPM 5300P has two options for this purpose. The standard set-up is clockwise ABC rotation. Counterclockwise CBA rotation can be selected in GROUP 03.1, Switch C UP.

PHASE REVERSAL: Activates when a reversed phase enters the EPM 5300P’s metering system.

PERCENT PHASE IMBALANCE: Activates when the user's preset value percent phase imbalance is

exceeded. For example: an unbalanced Three-phase System.

Note: The EPM 5200P does not have this capability.

FIGURE 13-1: EXAMPLE OF SET LIMITS

PHASE IMBALANCE Limits Triggered

10%

(%)

Limits Not Triggered

10:00 AM 11:00 AM THREE-PHASE SYSTEM IMBALANCE

13.2: Trip Relay

NOTE: All information pertaining to Trip Relays 1 and 2 applies only to a meter with the –NL option.

The unit has two relays linked through the program to LM1 and LM2 Set Limits. The relay outputs can be programmed individually to close when LM1 and/or LM2 is triggered. Each relay has provisions for a separate delay (see Chapter 12).

∃TRIP RELAY 1 %TRIP RELAY 2 &LEVEL ∋ENABLE/DISABLE

Whether to trip Relay 1. Whether to trip Relay 2.

The level at which the warning mechanism trips percentage of voltage imbalance.

In the event of Phase Reversal, whether to enable or disable Phase Reversal Detection.

GE Industrial Systems 5300P Advanced Power Meter 79