Siemens US2:9810RC - LVCS Overview; LPCT Configuration

Installation and commissioning 9810 series - User manual
60 7EN05-0390-08
LVCS overview
The Low Voltage Current Sensor (LVCS) hardware option is used with external low voltage
current transformers to sense current in each phase of a power feed. Use the LVCS option to:
•
Measure and monitor individual phases.
•
Help reduce installation costs for new or retrofitted installations.
•
Provide non-intrusive load monitoring.
LVCS only works with voltage output Low-Power Current Transformers (LPCTs) and is intended
for use with listed Energy-Monitoring current transformers rated for the application. To use LVCS,
a 9810 LVCS meter is required. See "9810 meter models and accessories" on page 21 for a list of
meters that support LVCS.
LPCT configuration
This section assumes your meter and LPCTs are already installed. For more information related
to installation, refer to the 9810 series – LVCS installation guide at www.usa.siemens.com/pds.
This section illustrates two common LPCT configuration scenarios and how they are configured
using ION Setup. You can also configure LPCTs using the meter webpages or display.
Configuration scenario 1: LPCT connected directly to conductor
The LPCT is connected directly to the line to be measured.
LPCT transformation ratio 10A:1V
Meter transformation ratio (default) 1A:1V
Example:
Set the meter CT ratio to 10:1 to match the transformation ratio of the LPCT and report the
conductor primary current.
CT ratio:
= LPCT ratio x Meter ratio
= 10:1 x 1:1
= 10:1