Section 3 REF615 variants
3.1 REF615 variant list
REF615 is intended for protection and control mainly in MV feeder applications. The
product has a number of standard configurations covering a wide range of primary
circuit configurations in distribution networks based on different system earthing
methods.
Some of the functions included in the IED's standard configurations are optional at
the time of placing the order. The description of standard configurations covers the
full functionality including options, presenting the functionality, flexibility and
external connections of REF615 with a specific configuration as delivered from the
factory.
3.2 Presentation of standard configurations
Functional diagrams
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 which each constitute 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.
1MRS756378 D Section 3
REF615 variants
REF615 27
Application Manual
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