12
TESTING PHASE SEQUENCE
WARNING
See “Product Safety Information”, page 4.
See “Inspection & Maintenance”, page 4.
See “Send Unit Set-up and Testing”, page 8.
See “Receive Unit Set-up and Testing”, page 9.
Phase sequence will be either:
(1 - 2 - 3) or (3 - 2 - 1)
(A - B - C) or (C - B -A)
Phase sequence is the order in which the voltages of a three phase system rise
and fall. Only two sequences are possible, sometimes referred to as Clockwise
or Counter Clockwise rotation. However, three different physical connections
are possible to achieve each sequence. Any one of the phases of a three-phase
system may be assigned the status of leading phase. This convention is currently
left to the discretion of the electric utility.
Sequence:
(1 - 2 - 3) or (A – B – C) A - B - C -
A - B - C - A - B - C
(B – C – A)
B - C -
A - B - C
- A - B - C - A
(C – A – B)
C - A - B - C -
A - B - C
- A - B
Sequence:
(3 - 2 - 1) or (C – B – A) C - B - A
- C - B - A - C - B - A
(B – A – C)
B - A -
C - B - A
- C - B - A - C
(A – C – B)
A - C - B - A -
C - B - A
- C - B
1.
Attach the Meter Probe to the appropriate length live line tools for the
voltage being tested.
2.
Set the selector switch to the
Deg
position.
3.
Touch or approach “1" ("A") phase with the Meter Probe indicated by
a near zero degrees and a 0 degree light. Send unit must be attached to
known “1” (“A”) phase.
4.
Touch or approach "2" ("B") phase with the Meter Probe.
5.
Sequence (1 - 2 - 3) (A - B - C) will be indicated by a nominal 120
degrees on the digital display and a 120 degree indicator light.
6.
Sequence (3-2-1) (C - B -A) will be indicated by a nominal 240
degrees on the digital display and 240 degree indicator light.
WARNING
Unit shall be tested before and after each use on a known voltage source.
Failure to do so could result in false negative indications.
Summary of Contents for Phasing Ranger 2
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