Woodward SEG HighPROTEC MRA4, Device Manual

Page: 287 / 510

IG-Protection Module – Ground Fault [ANSI 50N/G, 51N/G, 67N/G]
IG-Protection Module – Ground Fault [ANSI 50N/G, 51N/G,
67N/G]
Available stages:
IG[1] ,IG[2] ,IG[3] ,IG[4]
If you are using inrush blockings the tripping delay of the earth current
protection functions must be at least 30ms or more in order to prevent
faulty trippings.
All earth current elements IG[1]..IG[4] are identically structured.
This module offfers 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.
All IG[1]...IG[4] earth current protective elements can be planned user defined as non-directional or as
directional stages. This means, for instance, all 4 elements can be projected in forward/reverse direction. For
each element the following characteristics are available:
•
DEFT (UMZ)
•
NINV (AMZ)
•
VINV (AMZ)
•
LINV (AMZ)
•
EINV (AMZ)
•
MINV (AMZ)
•
VINV (AMZ)
•
EINV (AMZ)
•
Thermal Flat
•
IT
•
I2T
•
I4T
Explanation:
EN MRA4 04/09 Page 287
t = Tripping delay
t-char = Time multiplier/tripping characteristic factor
IG = Fault current
IG> = If the pick-up value is exceeded, the module/stage will be started.