Power System Wiring; Residual Current Measurement; Option Modules - Siemens 9810 Series User Manual

Installation and commissioning

Power system wiring

You can connect the meter's voltage inputs directly to the phase voltage lines of the power system
if the power system's line-to-line or line-to-neutral voltages do not exceed the meter's direct
connect maximum voltage limits.
The maximum voltage allowed for direct connection may be lower than the manufacturer-
specified limits, depending on the local electrical codes and regulations.
If your system voltage is greater than the specified direct connect maximum voltage, you must
use voltage (potential) transformers (VTs/PTs) to step down the voltages.

Residual current measurement

The meter can calculate or measure the residual current, depending on how the inputs are wired.
3 CT wiring
For a 3-phase 3-wire system, the meter
calculates residual current for Ground.
For a 3-phase 4-wire system, the meter
calculates residual current for Neutral.

Option modules

Option modules are ordered separately from your meter and can be connected to your meter
without specialized equipment.
Option modules are identified based on how they are physically connected to the meter's external
I/O bus.
The first connected module, attached directly to the meter, is Module A. The second module,
attached to Module A, is Module B. The meter supports up to four external modules:
57
For a 3-phase 3-wire system, the meter
measures the residual current for Ground at I4.
For a 3-phase 4-wire system, the meter
measures the residual current for Neutral at I4.
9410 series - User manual
7EN05-0336-09