7Hfkqlfdo 'Hvfulswlrq; Protection Functions; Measurement Functions; Power Quality Functions - ABB REF 54 Series Technical Reference Manual

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Technical Reference Manual, General

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The functions of the REF 54_ feeder terminal are categorized as:

• protection functions

• measurement functions

• power quality functions

• control functions

• condition monitoring functions

• communication functions

• general functions

• standard functions

The functions are further divided to three subsets that correspond to different
functionality levels (refer to section "Ordering Information" on page 88).
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Protection is one of the most important functions of the REF 54_ feeder terminal.
The protection function blocks (e.g. NOC3Low) are independent of each other and
have e.g. their own setting groups and data recording. The non-directional
overcurrent protection includes e.g. the three stages NOC3Low, NOC3High and
NOC3Inst, each with independent protection functions.
Either Rogowski coils or conventional current transformers can be used for
protection functions based on current measurement. Correspondingly, voltage
dividers or voltage transformers are used for protection functions based on voltage
measurement.
The protection function blocks are documented on the CD-ROM "Technical
Descriptions of Functions" (1MRS750889-MCD).
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AR5Func Auto-reclose function (5 shots)
2) Current unbalance protection for shunt capacitor banks
CUB1Cap
3) Three-phase current unbalance protection for H-bridge connected shunt
CUB3Cap
capacitor
CUB3Low Phase discontinuity protection
DEF2Low Directional earth-fault protection, low-set stage
DEF2High Directional earth-fault protection, high-set stage
DEF2Inst Directional earth-fault protection, instantaneous stage
1) Three-phase directional overcurrent protection, low-set stage
DOC6Low
1) Three-phase directional overcurrent protection, high-set stage
DOC6High
Three-phase directional overcurrent protection, instantaneous stage
1)
DOC6Inst
1) Underfrequency or overfrequency protection, stage 1
Freq1St1
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