Operation: CP1SD/T/L Version
CENTRON® Polyphase Meter Technical Reference Guide
73
A multitude of wiring conventions, phase loadings, and power factors can exist at
metering sites. Therefore, the vector diagrams obtained from actual metering sites will
most likely vary from those shown here. This should be expected and will cause no
metering errors, but some unusual circumstances could necessitate reconfiguration of
one or more of the diagnostics. For more information on SiteScan reconfiguration, refer
to the PC-PRO+ Advanced documentation.
Diagnostic #1 Error Example
This example is for a Form 9S meter wired for a 4-Wire Wye system with ABC phase
rotation, but the site was wired with a voltage circuit having the incorrect polarity (reverse
VT).
The first step of diagnosing an error is to place the meter into the Toolbox Mode and gather
the information.
The following is the information from the SiteScan snapshot when the Diagnostic #1 error is
triggered:
Phase A Display
(Left Element)
Phase B Display
(Center Element)
Phase C Display
(Right Element)
Voltage Phase
Angles
PhA 0.0° V
PhB 301.2° V
PhC 240.3° V
Phase Voltage
PhA 120.2 V
PhB 120.5 V
PhC 119.3 V
Current Phase
Angles
PhA 9.0° A
PhB 125.5° A
PhC 246.0° A
Phase Current
PhA 6.8 A
PhB 10.2 A
PhC 9.8 A
Diagnostic Counters
d1 001
d2 000 d3 000
d4 000 d5A 000 d5B 000
d5C 000 d5T 000 d6 000
The next step is to graphically plot the above information into a phasor diagram as shown in
the figure below.
