Woodward HighPROTEC - Page 893

Protective Elements
893 MCDGV4 DOK-HB-MCDGV4-2E
Generator Neutral
27TN / VX meas H3 pickup
(undervoltage )
59N pickup (overvoltage)
Third Harmonic
Neutral Voltage
3rd harmonic during normal operation
3rd harmonic during a fault
0%
100%
59
59N
&
t
T 0
t
T 0
27TN
>1
Logics
prevents faulty tripping during dead system / generator standstill
Neutral voltage (depending on
fault location)
Neutral voltage during normal
operation
59N
27TN
Generator Terminals
10% - 100%
0%-20%
Fundamental
59N
100%
27TN
Trip