Preliminary
9 Measurement Modes
9.1 Overview
The CAPO has three measurement inputs: A, B and HV-GND.
Over an internal relays-matrix they are automatically combined for the different measurement
modes as follows:
If the measured Input is guarded, it means that the input is internally connected to the so called
“V”-potential which is the low voltage point (reference) of the high voltage supply. All currents that
flow directly to this point will not be measured.
1
According to ANSI/IEEE Standard 62, IEEE Std C57.152-2013
90315-1.2 Instruction Manual CAPO
Page 72 of 117
Measurement Inputs
Mode
A
B
HVGND
UST A
measured
guarded
guarded
UST B
guarded
measured
guarded
UST A+B
measured
measured
guarded
GST A+B
measured
measured
measured
GSTg A
guarded
measured
measured
GSTg B
measured
guarded
measured
GSTg A+B
guarded
guarded
measured