Goodwe SDT Series User Manual page 40

06 Electrical Connection
Power limit networking with single inveter (GM3000C)
1. The place to snap fit the CT shall be near the grid connection point and the installation
direction must be right. "-->" of CT refers that the inverter current flows to the Grid. If CT
is installed reversely, the inverter will be triggered with an alarm and unable to realize the
power limit function.
2. The CT bore diameter shall be bigger than the outer diameter of AC power cable, to ensure
the AC power cable can be inserted into CT.
3. For specific CT wirings, please refer to the documents provided by the respective
manufacturer, to ensure that the wiring direction is correct and CT is able to work properly.
4. CT shall be snap fitted on Cable L1, L2 and L3. Do not install it on Cable N.
5. Prepare CT by yourself for external installation when selecting 3000C smart meter.
Specification of CT:
• Choose nA/5A for the current transformation ratio of the external CT. (n refers to CT
primary input current value, which is between 200 - 5000, chosen by the user according
to the actual conditions. 5A refers to CT secondary output current value.)
• The sampling error for the CT current shall be ≤ 1% (the recommended precision is 0.5,
0.5s, 0.2, or 0.2s).
• The recommended wire diameter for the CT secondary output cable is 1.5mm,
corresponding to 1.5mm² in cross-sectional area.
6. The load current of any phase shall be more than 120A.
PV String
Inverter
WARNING
External CT
Load
36
User Manual V1.3-2024-01-25
GM3000C
Meter Grid