Quick start manual

STER PMU Quick Start Manual Working with the instrument
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IN I3 C B A I1
L1
L3C
N
A
I2
L2 B
Figure 4.13: Wiring configuration for a 3-phase 3-wire system
4.5.2 CONNECTING TO MID- AND HIGH-VOLTAGE POWER SYSTEMS
In systems where voltage is measured at the secondary side of a MV/HV voltage transformer, the instrument
voltage range should be set to 150 V and scaling factor of that voltage transformer ratio has to be entered in order
to ensure correct measurement. Current range and CT ratio should be also configured to match the measuring
equipment.
These settings are changed in the MEASUREMENT SETUP screen, as described in chapter 4.1.1. To exit the menu
and apply settings, press the to exit the menu, and then confirm the action with .
Connecting the instrument to a 3-wire MV system should be done according to the following figure:
IN I3 C B A I1
L1
L3C
N
A
I2
L2 B
L2
L1
high
voltage
power plant
measuring instruments
A
A
A
L3
Figure 4.14: Connecting to existing on-site current transformers in a MV system, using a 3W connection
In case of a 4W system with VTs in a star connection, instrument should be connected according to Fig. 4.11.