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6.4.6.6
Simplified block diagrams
The principle design of the generator differential protection is shown in figure
.
Calculation
Idiff and Ibias
Calculation
instantaneous
Idiff
Pickup
and trip
logic
TRIP
Signals
PICKUP
Signals
BLOCK
Signals
Intern/
extern
Fault
Phasors IAN, IBN,ICN
Phasors IAT, IBT,ICT
Samples IAN, IBN,ICN
Samples IAT, IBT,ICT
Magnitude
Idiff and Ibias
Samples Idiff
Diff.prot.
characteristic
Hamonic
analysis: DC,
2nd and 5th
Pickup
phase
selective
Phasor IAN (neg.seq.)
Phasor IAT (neg.seq.)
Internal/
External Fault
Discriminator
and Sensitive
differential
protection
Calculation
negative
sequence
Idiff
Harm.
Block
Analog
Outputs
INTFAULT
EXTFAULT
OPENCT
OPENCTAL
en06000434-2_ansi.vsd
The sensitive protection is deactivated
above bias current > 150 % rated
current.
ANSI06000434 V2 EN
Figure 56:
Principle design of the generator differential protection
Simplified logic diagrams of the function is shown in figures below.
Section 6
1MRK 502 048-UUS A
Differential protection
146
Technical manual
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