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BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
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Fax: +86-25-51816989
25
layer) of generator
5.5.1 Protection principle
The protection reflects the size of negative sequence current of generator stator and surface
overheating of generator rotator is avoided.
Current is taken from generator neutral point (orgenerator terminal) TA.
Tripping mode: signaling or tripping.
t1/0
I
2
>
发信或跳闸
t2/0
发信或跳闸
Figure 5-9 Tripping logic of negative sequence overcurrent protection of generator
5.5.2 Setting contents
1) Negative sequence current operation ration I
2.dz
Setting negative sequence current, unit (A).
2) Operation time t
1
Deferred operation time of setting protection, unit(s).
3) Operation time t
2
Deferred operation time of setting protection, unit(s).
5.5.3 Setting calculation of protection
1) Negative sequence current operation ration I
2.dz
Please see Rules and Regulations.
2) Operation time t
1
and
t
2
Please see Rules and Regulations.
5.5.4 Sensitivity checking
Please see Rul
es
and
Regulations
.
5.6 Overload protection of generator
5.6.1 Protection principle
The protection reflects the current size of generator stator. Current is taken from a certain phase (such
as B phase) current of generator neutral point (orgenerator terminal).
Tripping mode: signaling or tripping (indicated in the order).
Signaling or tripping.
Signaling or tripping.