Woodward highprotec MRI4, User Manual

Page: 416 / 727

Protective Elements
Protective Elements
I - Overcurrent Protection [50, 51,51Q, 51V*]
Available stages:
I[1] ,I[2] ,I[3] ,I[4] ,I[5] ,I[6]
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.
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.
The following table shows the application options of the Overcurrent Protection element
Applications of the I-Protection Module Setting in Option
ANSI 50 – Overcurrent protection, non-
directional Device Planning menu Measuring Mode:
Fundamental/TrueRMS/negative
phase sequence current (I2)
ANSI 51 – Short circuit protection, non-
directional Device Planning menu Measuring Mode:
Fundamental/TrueRMS/negative
phase sequence current (I2)
ANSI 51V – Voltage restraint overcurrent
protection
*
Parameter Set:
VRestraint = active Measuring Mode:
Fundamental/TrueRMS/negative
phase sequence current (I2)
Measuring Channel:
Phase to Phase/Phase to Neutral
ANSI 51Q Negative Phase Sequence
Overcurrent Protection Parameter Set:
Measuring Method =I2
(Negative Sequence
Current)
51C Voltage controlled overcurrent
protection
*
(Please refer to the chapter
Parameter/Adaptive Parameter)
Adaptive Parameters Measuring Mode:
Fundamental/TrueRMS/negative
phase sequence current (I2)
Measuring Channel:
(in voltage protection module)
Phase to Phase/Phase to Neutral
* =available only for devices that offer voltage measurement.
416 MRI4 DOK-HB-MRI4-2E