5-210
G60 Generator Protection System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
The split phase element allows a separate pickup setting to be applied for each phase. Additionally, the pickup can be
biased by the load current (slope characteristic). Two modes of operation are supported (over and over-under).
Figure 5–102: SPLIT PHASE PROTECTION FOR 2 CTS
Figure 5–103: SPLIT PHASE PROTECTION FOR 1 CT
The split phase element principle of operation is as follows. First, define the following parameters:
I
split
: split-phase current,
I
load
: load current, pickup: pickup setting, min_load: minimum load supervision setting
Then, the expected value of the steady state unbalance (defined as bias current) is expressed as follows:
(EQ 5.24)
where:
(EQ 5.25)
and offset is the split phase current at no-load. In “Over” mode, the element will pickup if:
(EQ 5.26)
In “Over-under”, mode, the element will pickup if:
830728A1.CDR
Split Phase
Source
Load
Source
830727A1.CDR
Split Phase
Source
Load
Source
I
bias
slope
I
load
×
offset
+
=
slope
I
split
I
load
-----------
Load CT Primary
Load CT Secondary
-----------------------------------------------------
Split Phase CT Secondary
Split Phase CT Primary
----------------------------------------------------------------------
×
×
=
I
split
I
bias
–
pickup
>
(
)
and
I
load
min_load
≥
(
)
Summary of Contents for Multilin g60
Page 10: ...x G60 Generator Protection System GE Multilin TABLE OF CONTENTS INDEX ...
Page 32: ...1 22 G60 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 160: ...4 30 G60 Generator Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 486: ...5 326 G60 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 518: ...6 32 G60 Generator Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 532: ...7 14 G60 Generator Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 748: ...D 10 G60 Generator Protection System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 760: ...E 12 G60 Generator Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...