Kane Hawk5000 Operator's Manual - page 4
HAWK 5000 OPERATOR MANUAL
KANE INTERNATIONAL LIMITED
4
SCALE SETTING
Pulses
Pulse inputs need to be defined as follows: the
unit name
,
scale
and
offset values
for the two
pulse inputs. If pulse inputs are not being used, then this section need not be set-up. The scale
and offset are implemented as follows:
Value = ( Number-of-pulses x scale ) + offset
The offset value is required for those meters that give a set number of pulses to represent a
zero output just as in a 4 to 20 mA current loop.
Input scaling
Each of the two scale factors is used to convert the input measured by the HAWK back to an
actual voltage or current.
For example, if 1000 to 1 CT clamps are being used directly around the conductors being
measured, the current reaching the HAWK CT input will be one thousandth of the current
flowing in the main conductor, and so the value measured by the HAWK must be multiplied
by one thousand to convert back to the actual current value in amps. If the
'Amps Scale
Factor'
is set to 1000, this multiplication will be done automatically within the HAWK, so
the uploaded survey data will be correct.
Thus the
Amps scale factor
will usually be the CT clamp ratio (normally 1000). However if
the CT clamps are connected to the secondary of metering or protection CTs, rather than
around the conductors themselves, the Amps scale factor should be the ratio of the metering
CT multiplied by the ratio of the CT clamp.
The
"Volts scale factor"
should be set to the ratio of the voltage of the supply to the voltage
powering the HAWK. If the RMS phase to neutral voltage of the supply if 240 Volts, and the
HAWK is being powered by 240 Volts, then the scale factor should be 1. If the supply being
measured is 11 kV, and the HAWK is being supplied from this via a step-down transformer
at 240 V, then the scale factor should be 11000 divided by 240 (45.83333).
Measuring
The HAWK measures mains voltage and frequency from its mains supply.
The other two phases of a three-phase system are assumed to have the same amplitude,
waveform and frequency, but to be 120 degrees apart.
The HAWK5000 does not require any connections to live bare conductors.