Environmental Engineering Reference
In-Depth Information
Oil conservator
Shaft
Bevel gear
Transformer cover
Transformer tank
Diverter switch
On-load tap-changer
Shaft
Tap selector
Motor-drive mechanism
Figure 4.2
On-load tap-changer schematic diagram (Courtesy ABB) [183]
y
km
=
G
km
+
jB
km
1 : |
t
|
∠τ
+
+
I
′
km
I
′
mk
I
km
V
′
k
V
m
= |
V
m
|
∠θ
m
V
k
= |
V
k
|
∠θ
k
-
-
k
m
Figure 4.3
Representation of an OLTC transformer [182]
Afterwards, by using the above terms the complex power flowing from node
k
to
node
m
can be developed through the following steps:
τ
(
I
km
)
∗
V
k
I
km
=
S
km
=
V
k
|
t
| ∠
(4.5)
| ∠
τ
(
V
k
−
V
m
)
∗
y
km
=
V
m
)
∗
y
km
S
km
=
V
k
|
t
V
k
|
t
| ∠
τ
(
V
k
|
t
| ∠
τ
−
(4.6)
|
(
θ
k
−
θ
m
+
τ
)
(
G
km
−
2
2
S
km
=
V
k
|
|
t
|
− |
V
k
||
V
m
||
t
| ∠
jB
km
)
(4.7)
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