Logic module HCFDACADABC2BAN11E

The functional diagrams describe the IED’s functionality from the protection, measuring, condition monitoring, disturbance recording, control and interlocking perspective.

Diagrams show the default functionality with simple symbol logics forming principle diagrams. The external connections to primary devices are also shown, stating the default connections to measuring transformers. The positive measuring direction of directional protection functions is towards the outgoing feeder. The functional diagrams are divided into sections with each section constituting one functional entity.

The external connections are also divided into sections. Only the relevant connections for a particular functional entity are presented in each section. Protection function blocks are part of the functional diagram. They are identified based on their IEC 61850 name but the IEC based symbol and the ANSI function number are also included. Some function blocks, such as PHHPTOC, are used several times in the configuration.

To separate the blocks from each other, the IEC 61850 name, IEC symbol and ANSI function number are appended with a running number, that is an instance number, from one upwards. If the block has no suffix after the IEC or ANSI symbol, the function block has been used, that is, instantiated, only once. The IED’s internal functionality and the external connections are separated with a dashed line presenting the IED’s physical casing.