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BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
Contact: [email protected]
Fax: +86-25-51816989
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1) Low voltage U
hl
·
dz
at high tension side
It is set according to low voltage permitted by the system for long time.
2) Impedance circle center -X
c
It is set according to static stability circle or asynchronous circle.
3) Impedance circle radius X
r
It is set according to static stability circle or asynchronous circle.
4) Rotator low voltage V
fl
·
dz
Rotator low voltage is set according to 0.2
~
0.5 times of excitation voltage of generator in case of
zero load.
5) Scale coefficient K
zd
of rotator low voltage
Sn
Kk
Vfde
Kzd
×
=
Vfde: rotator voltage (V) of generator in case of full load
Sn: rated power (MVA) of generator
Kk: reliable coefficient (generally, 1
~
1.5)
6) Reactive power Pt
Salient pole effect is taken into consideration, unit (MW).
N
q
t
S
X
X
P
*
)
1
1
(
2
1
d
∑
−
=
∑
of which:
S
d
d
X
X
X
+
=
Σ
,
S
q
q
X
X
X
+
=
Σ
X
d
and X
q
are respectively reactance (per unit) of d axis and reactance of q axis of generator and S
N
is
secondary base power.
7) Operation time t
1
Deferred operation time of setting protection, unit (s)
8) Operation time t
2
Deferred operation time of setting protection, unit (s)
9) Operation time t
3
Deferred operation time of setting protection, unit (s)
5.5 Fixed time lag negative sequence overcurrent protection (overload protection of rotator surface