Customer Installation
Advice
No. 1051 22/6/98
Ref. Doc.
TO: All Staff, Accredited/Authorised Service Providers (Category 4 - Metering)
and Customers
Phase Sequence Indicators (PSIs)
Introduction
This Customer Installation Advice is considered necessary because of the confusion
being experienced by some EnergyAustralia staff and Accredited/Authorised
Contractors (Category 4 - Metering) in the use of Phase Sequence Indicators (PSIs),
when connecting EnergyAustralia two and three phase meters to the supply mains.
This confusion is due to the fact that a number of commercially available PSIs indicate
clockwise rotation when connected correctly to an anti-clockwise sequence. Also,
EnergyAustralia has modified one of the commercially available units (Hioki Rotary) to
indicate anti-clockwise rotation (rather than clockwise) when connected correctly to an
anti-clockwise sequence.
Convention
Australia follows an anti-clockwise phase sequence and the International
Convention for this sequence is ABC, RST, or RWB (Red White Blue) connected
left to right. Some PSI units may be labelled RYB instead of RWB.
EnergyAustralia poly-phase meters are tested and adjusted according to this convention.
Types of PSIs
The following PSIs are in common use. This is not a complete list and other types may
be encountered:
1. Encapsulated Neon (manufactured by S.C.C.)
2. Hioki Rotary PSI (modified by EnergyAustralia)
3. Hioki Rotary PSI (as purchased, un-modified)
4. Kyoritsu Rotary Unit Cat. No. 8031
5. Kyoritsu (LED) Unit Cat. No. 8030
6. Martindale neon type.
PSIs 1 and 2 above are in common use by EnergyAustralia staff.
The Hioki rotary PSI “as purchased” (PSI 3 above) rotates in a clockwise direction
when connected correctly to an anti-clockwise sequence. EnergyAustralia has modified
this particular unit to rotate in an anti-clockwise direction when connected correctly to
an anti-clockwise sequence (PSI 2 above). This has lead to some confusion when
EnergyAustralia staff and Contractors using the two different instruments compare
measurements.
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With the “as purchased” Hioki rotary units, if the direction of rotation of the disc
“agrees” with the direction of the fixed arrow marked on the unit, then the phase
rotation is correct i.e. RWB.
The PSIs indicate as follows, when connected correctly to an anti clockwise sequence:
PSI 1:
Indicates anti-clockwise
PSI 2:
Rotates anti-clockwise
PSI 3:
Rotates clockwise
PSI 4:
Rotates clockwise
PSI 5:
Indicates clockwise
PSI 6:
Indicates RYB.
Connecting PSIs
Three-Phase, Direct-Connected Meters
Connect the red lead to the left-hand meter line terminal, the blue lead to the right-hand
meter line terminal and the white (or yellow) lead to the middle meter line terminal of
the three-phase meter.
Two-Phase, Direct-Connected Meters
Connect the red lead to the left-hand meter line terminal, the blue lead to the neutral
meter terminal, and the white (or yellow) lead to the right-hand meter line terminal of
the two-phase meter.
For a two-phase meter, the PSIs indicate as follows, when connected correctly to an
anti-clockwise sequence:
PSI 1:
Indicates clockwise
PSI 2:
Rotates at half speed in a clockwise direction
PSI 3:
Rotates at half speed in an anti-clockwise direction
PSI 4:
Rotates at half speed in an anti-clockwise direction
PSI 5:
Indicates anti-clockwise
PSI 6:
Indicates RBY.
The installation of a three-phase meter on a two-phase supply is not permitted in
EnergyAustralia.
_________________________________
J. Panetta
Engineer - Network Access Policy
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