Overcurrent Protection [51, 51C, 51V, 67] - Eaton EDR-5000 Nstallation, Operation And Maintenance Manual

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51P - Overcurrent Protection [51, 51C, 51V, 67]

Available stages:

51P[1] ,51P[2] ,51P[3]

The following table shows the application options of the Overcurrent Protection element

Applications of the 51P-Protection Module

ANSI 51 – Short circuit protection, non-

ANSI 67 – Overcurrent/ Short circuit

protection, directional

ANSI 51V – Voltage restraint overcurrent

51C Voltage controlled overcurrent protection

(Please refer to the chapter

Parameter/Adaptive Parameter)

If you are using inrush blockings the tripping delay of the current protection

functions must be at least 30ms or more in order to prevent faulty trippings.

In order to ensure correct functioning of the directional detection after single-phase

short-circuits, the following reference voltage is used: For phase current IA it is the

line-to-line voltage VBC , for phase current IB the line-to-line voltage VCA and for

phase current IC the line-to-line voltage VAB .

In case the fault happens to be near the measuring location and there is no reference

voltage for directional recognition available any more (neither measured or from

history (voltage memory)), then the module will - depending on the parameter setting -

either trip non-directional or it will be blocked.

All overcurrent protective elements are identically structured.

This module offers Adaptive Parameter Sets.

Parameters can be modified within parameter sets dynamically by means of

Adaptive Parameter Sets.

Please refer to chapter Parameter / Adaptive Parameter Sets.

Device Planning menu

Parameter Set:

VRestraint = active

Adaptive Parameters

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Criterion: Fundamental/TrueRMS

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