Open Phase (Fixed Unbalance Factor); Opposite Phase - Omron KE1 User Manual

 Open phase (Fixed unbalance factor)
PGR1C PVS1C
(Electric power (Electric power
/leakage) /voltage sag)
○
O: With function X: Without function
The occurrence of an open phase is determined when the calculation result of (max.
difference between each phase voltage and average voltage)/average voltage is 85% of the
max. phase voltage or less in 3-phase 3 -wire or 3-phase 4-wire system.
Voltage 1
Input Voltage 2
Voltage 3
Alarm LED
 Opposite phase
PGR1C PVS1C
(Electric power (Electric power
/leakage) /voltage sag)
○
O: With function X: Without function
Opposite phase means the case where the phase sequence of voltage is not normal.
When the phase order is normal, phases R, S, and T are 0°, 120°, and 240°, respectively,
with reference to phase R.
If the measured phase difference continues to show an incorrect relationship of angles for 0.1
s or more, the occurrence of an opposite phase is determined.
When an opposite phase is detected, check the equipment and wiring for any problem.
* Since phases other than the ones detected as normal phase are classified as opposite
phase, opposite phase detection may be provided at the time of an open phase occurrence.
R phase
S phase
T phase
Normal phase
VSU1B
(Voltage sag) (Voltage/current)
○ ○
Unbalanced operation value (85%)
Lighting
VSU1B
(Voltage sag) (Voltage/current)
○ ○
3.5 Voltage/current monitoring function
VAU1B CTD8E
(CT extension) (ZCT extension)
○ ×
VAU1B CTD8E
(CT extension) (ZCT extension)
○ ×
R phase
S phase
T phase
ZCT8E
×
(Max. phase voltage)
(Average voltage)
ZCT8E
×

Opposite phase

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