Protection Functions
PRS-7367 199
3.41.1.2 Signal
Table 3.41-1 Input Signals
The voltage in all the three phases
The current magnitude in all the three phases
The binary input of CB close position
This signal blocks all the binary output signals of the function
This signal blocks all the start outputs of the function
This signal blocks all the trip signals of the function.
This signal enables the current multiplier.
Table 3.41-2 Output Signals
This is the integrated start signal
This is the integrated operation signal.
This is the integrated Alarm signal
3.41.2 Protection Principle
GAP over current zero sequence over voltage protection can be independent enabled. The gap
overcurrent is zero sequence overcurrent, which is used for the gap current generated after the
neutral overvoltage breaks down the gap when the normally open contact of the ground switch at
the neutral point of the transformer is disconnected. The gap zero sequence overcurrent CT is
generally used in the transformer zero sequence casing CT, and the open voltage of bus PT is
used in the zero sequence overvoltage CT.
3U0DANA
IJANA
SIG CB_Close
1
&
&
DT
SIG BlkStr
SIG BLKOp
SIG GAP_ENBI
&
Str
SIG
Op
SIG
&
Figure 3.41-1 Logic Diagram for Gap
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