G. Ziegler. Digital Differential Protection
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G. Ziegler, 5/2005 page 259
Differential Protection Symposium
Belo HorizonteNovember 2005
7UT6: Temperature monitoring with hot spot calculation (1)
Example: Natural cooling
HV
LV
Oil -
Temp.
Y
grOh
kHΘΘ ⋅+=
Θh= hot spot temperature
Θh= oil temperature
H
gr
=hot-spot-to-oil temperature gradient
k= load factor I/In
Y= winding exponent
98)/6(Θ
2
C98at Aging
h
Θat Aging
V
h
−
=
°
=
∫
⋅⋅
−
=
2
1
T
T
12
dtV
TT
1
L
Aging rate:
Mean value of aging during a fixed time interval:
98
O
is reference for
the aging of
Cellulose insulation
G. Ziegler, 5/2005 page 260
Differential Protection Symposium
Belo HorizonteNovember 2005
1.622V
98)/6(102
98)/6(Θ
h
≈==
−
−
C1021.152373kHΘΘ
1.6Y
groh
°=⋅+≈⋅+=
Θ
h
Θ
o
t
[°C]
98°C
Θ
h
Hot spot
temp.
1.6
102°C
1.15
73°C
k (I/In)
108°C
k,
V,
L
V (relative
aging)
L (mean
value of V)
Θ
o
oil temp.
(from thermo
-
device)
(L)
7UT6: Temperature monitoring with hot spot calculation (1)
Example: Natural cooling
G. Ziegler, 5/2005 page 261
Differential Protection Symposium
Belo HorizonteNovember 2005
7UT6: Commissioning und service tool (1)
WEB-Technology
Relay homepage address of :
http://141.141.255.160
IP-address can be set with
program DIGSI 4 at the front or
service interface of the relay
WEB server
in relay firmware
Server sends HTML pages and
JAVA code to WEB Browser via
DIAL-UP connection
Help system in the
INTRANET / INTERNET
http://www.siprotec.com
2. HTM L page view
at IP-address of the relay
http://141.141.255.160
1. Serial connection
Directyor with modem
to standard DIAL-UP
network
Access to WEB Browser
G. Ziegler, 5/2005 page 262
Differential Protection Symposium
Belo HorizonteNovember 2005
Transformer YNd11d11, 110/11/11kV, 38.1MVA,
IL2S2à wrong polarity
7UT6: Commissioning and service tool (2)
Current phasorsof all terminals can be displayed
G. Ziegler, 5/2005 page 263
Differential Protection Symposium
Belo HorizonteNovember 2005
Transformer YNd11d11, 110/11/11kV, 38.1MVA, IL2S2à wrong Polarität
7UT6: Commissioning and service tool (3)
Operating/restraint position can be displayed
Power Transmission and Distribution
Differential Protection (7UT)
Determination of the Transformer Vector Group
PTD PA13 N. M Tests 7UT 05/03 No. 2
Transformer with Vector Group Yy0
7UT612
20 kV
110 kV
2500A/1A
500A/1A
80 MVA
Yy0
PTD PA13 N. M Tests 7UT 05/03 No. 3
Side 2: Side 1:
1L1
1L2
1L3
2L1
2L2
2L3
I
L1,S1
I
L1,S2
= I
L1
Vector group is
Y y 0
0°
Method of Vector Group Determination (ExampleYy0)
U
L1,S2
U
L3,S2
U
L2,S2
U
L1,S1
U
L2,S1
U
L3,S1
I
L1,S1
I
L1,S2
PTD PA13 N. M Tests 7UT 05/03 No. 4
Transformer Protection
7UT612
20 kV
110 kV
2500A/1A
500A/1A
80 MVA
Yd11
PTD PA13 N. M Tests 7UT 05/03 No. 5
Method of Vector Group Determination (ExampleYd11)
I
L1,S1
I
L1,S2
= I
L1
- I
L2
330°
(n * 30°)
Vector group is
Y d 11
Side 2: Side 1:
1L1
1L2
1L3
2L1
2L2
2L3
U
L1,S2
U
L3,S2
U
L2,S2
U
L1,S1
U
L2,S1
U
L3,S1
I
L1,S1
I
L1,S2