ABB RELION 620 Series Technical Manual page 157

1MAC504801-IB E
620 series ANSI
Technical Manual
A070982-ANSI V1 EN
Figure 65: Functionality of numerical multiple-stage overcurrent protection
The coordination plan is an effective tool to study the operation of time selective operation
characteristics. All the points mentioned earlier, required to define the overcurrent
protection parameters, can be expressed simultaneously in a coordination plan. In
66, the coordination plan shows an example of operation characteristics in the LV-side
incoming feeder and radial outgoing feeder.
Section 4
Protection functions
Figure
151