09-1 Machine Prot. Exercises.ppt

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Siemens Power Academy TD
Machine Protection
SIPROTEC 7UM62
Exercises

09-1_Page 2
Machine Protection 7UM62 Exercises
SIPROTEC 4 Generator protection Siemens Power Academy TD
EM1: Single line diagram
7UM62.
-T1
50 MVA, YNd11
110 ±5·2.5% / 11 kV
uT(1) = 8 %
3 110 kV
side 1
iL1,2,3
uL1,2,3
G
3~
-G1
46.6 MVA
11kV ±7.5%
300/1A, 20VA
5P20, Rct=1.2Ω
3000/1A, 20VA
5P20, Rct=12Ω
300/1A, 20VA
5P20, Rct=1.2Ω
side 2
iL1,2,3
IEE2
UE
IEE1
Excit.
7XT71
TD1 (REF)
TD2 (REF)
TD3 (<Excit.)
Ucontr.
Umeas.
7XR6004
3PP1326
~
7XT34 7XT33
20Hz Gen.
3
kV
0.1
3
kV
0.1
3
kV
11
sensitive current input only!!
500V
3
kV/
11
Q7
Q8
3000/1A, 20VA
5P20, Rct=12Ω
400/5A 5/2
SEF (20Hz)
SEF (20Hz)

09-1_Page 3
EM1: Neutral transformer circuits *)
400/5A
1FS5
15VA
P1
RL
P2
1B1
1A4
1A3
1A1
7XT34
1B4 4A1
4A3
7XT33
20 Hz
Bandpass
20 Hz
Generator
S1
S2
7UM62.
R13 UE
R14
J8 IEE1
J7
max. 3A (20Hz)
Protection cubicle
.. mA
20Hz
500V
3
kV/
11
1A2
330Ω
660Ω
660Ω
Burden < 0.5Ω
*) for information only, not used for this exercises

09-1_Page 4
EM1: Required protection elements for the exercises
50/51 Over current I>
32R Reverse power
-- Decoupling (Threshold supervision)
87 Generator Differential Protection
59/67GN 90% Stator Earth Fault U0> (calculated)
46 Unbalanced Load (negative sequence
40 Under excitation
21 Impedance Protection
78 Out of Step (loss of synchronism) *
* Option

09-1_Page 5
EM1: Device configuration (partly)
for Decoupling
Option

09-1_Page 6
EM1: Power System Data 1 (1/4)
1)
1) Neutral transformer is high resistive

09-1_Page 7

09-1_Page 8
)
/ratio(U
U
U
U
U
Factor UE
0224
divider
NTsec
NTprim
Esec
VTprim


31.7
V/(5/2)
500
3
V/
11000
Factor UE
0224 

Refer to Setting Options for the UE Input and their Impact
on the Protection Functions (refer to slide No. 10)

09-1_Page 9

09-1_Page 10
Setting Options for the UE Input and their Impact
on the Protection Functions

09-1_Page 11
Generator: electrical data (1/2)

09-1_Page 12
Generator: electrical data (2/2)

09-1_Page 13
EM2.0 Connection SIP4 7UM to CMC - Voltage
SIPROTEC 7UM622
CMC 256

09-1_Page 14
EM2.0 Connection SIP4 7UM to CMC - Current
SIPROTEC 7UM622
CMC 256

09-1_Page 15
EM2.0 Connection SIP4 7UM to CMC – Trip signal
SIPROTEC 7UM622
CMC 256
Trip signal

09-1_Page 16
EM2.0 Connection binary inputs SIP4 7UM to CMC
SIPROTEC 7UM622
CMC 256
External signal
U aux dc = 110 V (Check MLFB)

09-1_Page 17
EM2.1: Over current Protection I>
Settings: primary values

09-1_Page 18
EM2.2: Reverse Power

09-1_Page 19
E2.3: Decoupling, (Example with Threshold supervision) (1/3)
-dP (-50%)
<I2 (<10%)
I>> (3·IN, p.u.)
&
CFC
MV2<, 8503, 8504
MV4<, 8507, 8508
0113
07961
07963
01808
External Trip 1
04526
8602: t = 0.15s
S Q
R Q
0
T
It can be assumed that the Generator will run out of step in case a three-phase
short circuit close to the power station will last for (example) more than 150ms.
This situation can be described by the following AND logic.
If the fault is not cleared immediately the unit will be decoupled from the net after 150 ms.

09-1_Page 20
EM2.3: Decoupling, (Example with Threshold supervision) (2/3)

09-1_Page 21
EM2.3: Decoupling, (Example with Threshold supervision) (3/3)

09-1_Page 22
EM2.4: Settings for Generator Differential Protection (1/2)
Tripping Characteristic 7UM6
2031
IDiff>>
2044A
BASE POINT 2
2021
IDiff>
2061A
I-ADD ON STAB
2042A
BASE POINT 1
2
0
4 8 10
6 12
0
2
1
4
3
6
5
Trip Block
2041A
SLOPE 1
2043A
SLOPE 2
Add-on
Stabilization
45°
InO
IRest
InO
IDiff
*)
*) Slope for Add-on Stabilization:
7UM6  Slope 1
Settings:
2021: 0.20 I/InO
2026A: 0.00 sec
2031: >(1/xd‘)·InO
≈ 5.50 I/InO
2036A: 0.00 sec
2041A: 0.25
2042A: 0.00 I/InO
2043A: 0.50
2044A: 2.50 I/InO
2061A: 3.00 I/InO
Duration of Add-on Stabilization
2062A: 15 Cycle
Crossblock Add-on Stabilization
2063A: 15 Cycle

09-1_Page 23
EM2.4: Settings for Generator Differential Protection (2/2)

09-1_Page 24
EM2.5: Settings for 90% Stator Earthfault (U0>, calculated) (1/2)
UL1
UL3
UL2
90%
L1
L2
L3
Settings (primary value):
5002: U0prim> = 100% - 90% = 10.0
%
5003: T = 0.30 sec
Fuse Failure Monitor (FFM) to be enabled
to block 90% SEF Element via CFC

09-1_Page 25
EM2.5: Settings for 90% Stator Earthfault (U0>, calculated) (2/2)

09-1_Page 26
EM2.6: Settings for unbalanced load (1/3)

09-1_Page 27
Settings in primary values:
1702: I2prim> = I2perm prim / IN Machine = 8.0 %
1704: Kprim = (I2/IN)2·t = 20 s
1705: tCooldown = Kprim /(I2perm prim /IN Machine)2 = 20s/0.082 = 3125 s
1706: I2prim>> = 60.0%
1707: T I2>> = 3.00 sec
Conversion to secondary values:
1702: I2sec> = I2prim> · IN Machine/IN CT = 8.0% · 2446A/3000A = 6.5 %
1704: Ksec = Kprim · (IN Machine/IN CT)2 = 20s·(2446A/3000A)2 = 20s·0.664 = 13.30 s
1706: I2sec>> = I2prim>> · IN Machine/IN CT = 60.0% · 2446A/3000A ≈ 49 %

09-1_Page 28

09-1_Page 29
EM2.7: Settings for under excitation protection (1/4)
1
2
Generator capability diagram
(from Manufacturer)

09-1_Page 30
Settings in primary values (using generator capability diagram)
3002: 1/xd1prim = 0.58
tan(1) = 0.7/0.2 = 3.5 , arctan(1) = 1.292
3003: 1 ≈ 74°
3005: 1/xd2prim = 0.44
3006: 2 = 90°
CTprim
N
VTprim
N
NMACH
NMACH
dMach
dsec I
U
U
I
x
1
x
1



UNMACH = 11kV , UN VTprim = 11 kV
INMACH = 46600kVA/(√3·11kV) = 2446A
IN CTprim = 3000A
0.815
A
3000
V
11k
kV
11
A
2446
I
U
U
I
CTprim
N
VTprim
N
NMACH
NMACH





3002: 1/xd1sec = 0.58·0.815 ≈ 0.47
3005: 1/xd2sec = 0.44·0.815 ≈ 0.36

09-1_Page 31
u
0
EXC
k
U
0.5
Exc
U
:
3013 

UEXC0 = 45V
ku (voltage divider) = 0.5 kΩ/ (0.5 kΩ+ 0.5 kΩ + 9 kΩ) = 20
3013 U Exc = 0.5·45 V /20 ≈ 1.13 V
generator
shaft
7XR6004 7UM62.
K13 +
TD1
K14
Excit.
K15 +
TD2
K16
20 kΩ
7XT71
27
25
19
21
15
17
A3
A11
A6
G
3~
20 kΩ
20 kΩ
B11
B18
B14
20 kΩ
control
meas.
Example:
LiYCY 4x1.5
Protection cubicle
3PP1326
500Ω
1
4 9 kΩ
2
500Ω
3
7UM62.
K17 +
TD3
K18
10µF
250V
1)

09-1_Page 32
For this exercise 

09-1_Page 33
EM2.8: Settings for impedance protection (1/4)
2*)
G
3~
Z< , 7UM6
X1 ≈ 0.70·X1 Transformer
T1,T1B
T2
X1  X1 Transformer
TEND
Z1
(R1,X1) Z2
(R2,X2)
Z1b
(R1b,X1b)
1*)
t
Z
1*) To be coordinated with net protection
2*) Setting can (must) be higher than the real Z up to the HV C.B.
BI. (activating Z1b)

09-1_Page 34
Im (Z)
Re (Z)
R1= Z1
X1=Z1
X2=Z2
X1b=Z1b
R2=Z2
R1b= Z1b
sec
3.00
T
:
here
protection
net
with
d
coordinate
be
to
T
:
3312
sec
0.50
T2
:
here
protection
net
with
d
coordinate
be
to
T2
:
3311
Ω
0.0
Z
:
here
protection
net
with
d
coordinate
be
to
Z
Z
S
U
100%
u
Z2
:
3310
T1
T1b
:
3309
2
k
:
here
k
S
U
100%
u
Z1b
:
3308
sec
0.10
T1
:
3307
70%
k
:
here
er
transform
into
reach
zone
Protection
k
S
U
100%
u
100%
k
Z1
:
3306
END
END
Net
Net
Net
Trf
N
2
Trf.LV
N
T
(prim)
x
x
Trf
N
2
Trf.LV
N
T
(prim)
r
r
Trf
N
2
Trf.LV
N
T
r
(prim)





















09-1_Page 35
sec
3.00
T
:
3312
sec
0.50
T2
:
3311
Ω
0.194
0Ω
MVA
50
kV
11
100%
8%
Z2
:
3310
0.10sec
T1b
:
3309
Ω
0.387
2
MVA
50
kV
11
100%
8%
Z1b
:
3308
sec
0.10
T1
:
3307
Ω
0.136
MVA
50
kV
11
100%
8%
100%
70%
Z1
:
3306
END
2
(prim)
2
(prim)
2
(prim)
















Ω
5.29
Ω
0.194
V
11000V/100
3000A/1A
Z2
k
k
Z2
:
3310
Ω
10.55
Ω
0.387
V
11000V/100
3000A/1A
Z1b
k
k
Z1b
:
3308
Ω
3.71
Ω
0.136
V
11000V/100
3000A/1A
Z1
k
k
Z1
:
3306
(prim)
VT
CT
(sec)
(prim)
VT
CT
(sec)
(prim)
VT
CT
(sec)
















09-1_Page 36

09-1_Page 37
EM2.9: Settings for out of step protection (1/3)




















90
P
:
3508
)
Z
(Z
0.289
Z
:
3504
Z
Z
:
3507
k
10Ω
Z
/U
U
/I
I
k
k
k
with
:
here
!
!
net
with the
d
coordinate
be
to
Z
5%)
8
k
:
(here
ormer
intoTransf
1
stic
Characteri
of
reach
k
S
100%
U
u
%
100
k
Z
:
3506
x
I
3
U
X
Z
:
3505
c(prim)
(prim)
b
a(prim)
c(prim)
d(prim)
sec
d(prim)
VTsn
VTpn
CTsn
CTpn
VT
CT
sec
d(prim)
r(OoS)
r(OoS)
Tr
N,
2
Tr(LV)
N,
T
r(OoS)
c(prim)
'
d
Gen
N,
Gen
N,
'
d
b(prim)

Za
Zb
Im (Z)
Re (Z)
Zd-Zc
Zc
Zd
φP
Char. 2
Char. 1

09-1_Page 38























90
P
:
3508
Ω
0.210
Ω)
0.165
Ω
(0.561
0.289
Z
:
3504
Ω
0.202
Ω
0.165
Ω
0.367
Z
-
Z
:
3507
Ω
0.367
27.27
Ω
10
Z
27.27
V
V/100
11000
A
A/1
3000
k
k
k
Ω
0.165
MVA
50
100%
kV
11
8%
100%
85%
Z
:
3506
Ω
0.561
0.216
2446A
3
11000V
Z
:
3505
a(prim)
c(prim)
d(prim)
d(prim)
VT
CT
sec
2
2
c(prim)
b(prim)

 
Ω
5.73
Ω
0.210
27.27
Z
k
Z
:
3504
Ω
5.51
Ω
202
.
0
27.27
Z
-
Z
k
Z
-
Z
:
3507
Ω
10
Z
Ω
4.50
Ω
0.165
27.27
Z
k
Z
:
3506
Ω
15.30
Ω
0.561
27.27
Z
k
Z
:
3505
above)
(from
27.27
k
a(prim)
sec
a(sec)
c(prim)
d(prim)
sec
c(sec)
d(sec)
d(sec)
c(prim)
sec
c(sec)
b(prim)
sec
b(sec)
sec























09-1_Page 39

09-1 Machine Prot. Exercises.ppt

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