CIRCUTOR CDP-0 - Manual (Page 21)

CDP
Instruction Manual 21
4.2.- APPLICATIONS
The CDP is the ideal unit for managing photovoltaic installations for self-
consumption with and without grid injection.
Four types of configurations can be distinguished depending on the type of grid
connection:
 Basic single-phase connection, in which the CDP only measures the
power consumed by the user.
 Single-phase connection with monitoring, the CDP measures the
power consumed by the user, the power generated by the inverter and the
power consumed from the grid.
 Basic three-phase connection, in which the CDP only measures the
power consumed by the user.
 Three-phase connection with monitoring, the CDP measures the
power consumed by the user, the power consumed from the grid and
calculates the power generated by the inverter.
The different configurations are described below.
4.2.1. BASIC SINGLE-PHASE CONNECTION
The CDP has a voltage measuring channel (VL1) and a current measuring
channel (IL1) and measures the single-phase power consumed by the user
using a current transformer (an MC1 or channel of an MC3). In this case, since it
does not measure the grid power, it cannot have the grid injection protection
relay function.
Figure 16: Connection diagram for the single-phase measurement system.
4.2.1.1. Voltage connection
For the basic single-phase connection, terminals VL1 and N must be connected
to the single-phase grid (it is recommended that VL2 and VL3 are connected to
N to avoid false measurements due to noise).