R
X
Z1, Fast zone
Z2, Slow zone
IEC06000453_3_en.vsd
Underexcitation Protection
Restraint area
IEC06000453 V3 EN-US
Figure 150: LEXPDIS (40) in the IED, realized by two impedance circles and a
directional restraint possibility
8.6.3 Setting guidelines
SEMOD156277-4 v5
Here is described the setting when there are two zones activated of the protection. Zone
Z1 will give a fast trip in case of reaching the dynamic limitation of the stability. Zone
2 will give a trip after a longer delay if the generator reaches the static limitation of
stability. There is also a directional criterion used to prevent trip at close in external
faults in case of zones reaching into the impedance area as shown in figure 150.
Operation: With the setting Operation
LEXPDIS (40) function can be set Enabled/
Disabled.
IBase, (refer to GlobalBaseSel): The setting IBase is set to the generator rated Current
in A, see equation
163.
Section 8 1MRK 502 071-UUS A
Impedance protection
308 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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