Operation: CP1SD/T/L Version
36
CENTRON® Polyphase Meter Technical Reference Guide
Power Circle Quadrants
The following power circle diagram shows the quadrants for watts and vars delivered and
received.
Figure 24: Power Circle Diagram
The directional calculations in the CENTRON
Polyphase meter are as follows:·
•
Watts delivered = (wattsQ1) + (wattsQ4)·
•
Watts received = (wattsQ2) + (wattsQ3)·
•
VA delivered = (VA while watts are in Q1) + (VA
while watts are in Q4)·
•
VA received = (VA while watts are in Q2) + (VA
while watts are in Q3)·
•
Var net delivered (while watts are delivered) =
(varQ1) - (varQ4)·
•
Var net received (while watts are received) =
(varQ2) - (varQ3)·
•
Var delivered (Lag) = (varQ1) + (varQ2)·
•
Var received (Lead) = (varQ3) + (varQ4)
Magnetic Switch
The magnetic switch allows for manual switching between display modes as well as scroll
lock of display items. To activate the magnetic switch, hold the magnet to the location
shown in the figure below. For more information on using the magnetic switch, see
Magnetic Switch.
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Optical Port
The optical port is mounted on the meter cover. The optical port is a communication
interface from the meter to a PC. Interface to a PC is accomplished through a
communication cable which attaches to the optical port on one end and a PC serial port on
the other end. This interface cable can be powered by a DC TAP, an AC Adaptor, or the
PC’s COM Port. Communication through the optical port may be at 9600, 14400, 19200, or
28800 bps.
