Current Sensors And Ratios - AEMC PEL102 User Manual

The ratio between the specified primary and secondary will be used by the instrument for all related calculations.
-
Phase-to-phase and Phase-to-neutral: Select either Phase-to-phase or Phase-to-neutral, depending on the
selected distribution system, for each of the Primary and Secondary values. Note that some systems only
allow one option.
The PEL 103 LCD will display a phase-to-phase voltage for secondary voltage if primary voltage is phase-to-phase and a
phase-to-neutral voltage for secondary voltage if primary voltage is phase-to-neutral.
NOTE: When no ratio is entered, 1000 V primary and secondary voltages are displayed on the PEL 103 LCD.
Voltage Transformer Ratios
Primary Voltage
Secondary Voltage
The value which zeroed the line-to-neutral voltage measurement, VLOW = 10V for phase-to-neutral voltages, and is multi-
plied by √3 for phase-to-phase voltages.
Nominal frequency: Specifies the default frequency of the distribution network.
-
Auto: Instructs the instrument to automatically identify the nominal frequency of the network.
-
50 Hz, 60 Hz and 400 Hz: The instrument will use the selected frequency for measurements.
NOTE: Auto mode may lead to inconsistencies if the frequency varies on an unstable distribution system.

4.4.4 current sensors and ratios

Current sensor ratios (and type) are automatically set with the identification of the current sensor detected on channel 1, or
channel 2 if current sensor on channel 1 is missing, or channel 3 if current sensor on channel 1 and channel 2 are missing.
NOTE: One type is allowed for the current sensor inputs. If different current sensors are mated (mismatch of current
sensors), only the type of the current sensor connected on I1 is used for current sensor selection.
See § 5.2.4 for detailed specification of the current sensors.
■ AmpFlex /MiniFlex
®
-
Range: Four ranges are available for the for AmpFlex
-
Number of primary wraps: Allows the sensor cable to be wrapped around the conductor multiple times
to increase the sensitivity of the probe. Specify the number of times the sensor is "wrapped" around the
conductor. The maximum current of the selected AmpFlex
wraps.
■
MN 93A for 5A:
-
An external CT is used: Check box that enables or disables a ratio for this probe. When enabled, the
following options can be specified.
-
Primary: Indicates the primary current of the CT.
-
Secondary: Indicates the secondary current of the CT for the specified Primary current. The Primary
and Secondary values establish a ratio used by the instrument when the probe is connected to the
instrument.
■
5A Adapter Box:
- An external CT is used: Check box that enables or disables a ratio for this probe. When enabled, the
following options can be specified.
-
Primary: Indicates the primary current of the CT.
60
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SV
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Range
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50 V to 1000 V
Table 9
/MiniFlex probes - 100 A, 400 A, 2000 A and 10000 A.
® ®
/MiniFlex
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Increment
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1 V
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