SIEMENS
Page 1 of 6
Power Transmission and Distribution
Date: Sept.-21-2007 Rev.: 7UM62.Inst.20Hz_1-3Hz_en 7UM62.Inst.20Hz_1-3Hz_en.002.01 .002.01 NM
7UM62x Installation Instructions for 100% SEF (20Hz) and rotor earth fault (1-3Hz & R,f n)
7UM62x - Installation Instructions for 100% SEF (20Hz) and Rotor EF (1-3Hz & R,fn) 100% Stator Earth Fault (20 Hz principle) Example 1: 20Hz Equipment installed close to neutral transformer
3
U NG / 3 500V
400/5A 4) 1FS5 5) 15 VA P2 P1 S2 S1
1B1
20 Hz Band pass
20 Hz Generator
7XT34
7XT33 1B4
Protection cubicle
4A1
RL
20Hz 4A3
1 2 7UM62.
3PP1336 Burden < 0.5Ω
6 250Ω 3 500Ω
5
R13
500Ω
4
R14
J8 J7
1) 2) 3) 4)
5)
UE
IEE1
The (separate) (separate) Voltage divider is only necessary necessary in case case of secondary voltages voltages higher higher than 200Va.c. Voltage divider divider to be be installed close to 7UM62 device device to minimize interference interference in these leads. Cross section section according according to the the maximum maximum (short time-) time-) current. The transformation transformation ratio of the miniature CT 400A/5 A can be halved to 200A/5A by passing the primary conductor twice through the transformer window. Principally also a class P core could be used.
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SIEMENS
Page 2 of 6
Date: Sept.-21-2007
Power Transmission and Distribution
Rev.: 7UM62.Inst.20Hz_1-3Hz_en.002.01 NM
7UM62x Installation Instructions for 100% SEF (20Hz) and rotor earth fault (1-3Hz & R,f n)
Example 2: 20Hz Equipment installed inside protection cubicle
Protection cubicle
3)
max. 3A (20Hz)
20 Hz Band pass
20 Hz Generator
7XT34
7XT33
1B1 1A4
1B4
4A1
660Ω
.. mA U NG / 3 500V
400/5A 4) 1FS5 5) 15VA P2 P1 S2 S1
RL
2)
660Ω
1A1
1)
20Hz
330Ω
1A2 1A3
4A3
7UM62. Burden < 0.5Ω
R13 R14
UE
J8 J7
IEE1
1)
Voltage divider is only necessary in case of secondary voltages higher than 200Va.c.
2)
The voltage divider must be connected via two separate leads directly to the load resistor RL. If not, the measured (20Hz) voltage is too high. (and the calculated resistance as well) Example: RL shall be 1 Ω and the loop resistance between band pass/20 Hz generator and load resistor shall be 1 Ω as well Æ measured 20Hz voltage and calculated resistance are approximately twice than real.
3) 4)
Cross section according to the maximum (short time-) current. The transformation ratio of the miniature CT 400A/5 A can be halved to 200A/5A by passing the primary conductor twice through the transformer window.
5)
Principally also a class P core could be used.
PTD Energy Automation Product Management
eMail: Phone: Fax :
[email protected] (++49) - 1805 247000 (++49) - 1805 242471
SIEMENS
Page 3 of 6
Date: Sept.-21-2007
Power Transmission and Distribution
Rev.: 7UM62.Inst.20Hz_1-3Hz_en.002.01 NM
7UM62x Installation Instructions for 100% SEF (20Hz) and rotor earth fault (1-3Hz & R,f n)
Rotor Earth Fault (1-3 Hz principle) Example 1: coupling unit 7XR6004 installed inside excitation cubicle Protection cubicle 7XT71
7XR6004 20 kΩ
A3
G 3~
Excit.
A6
27
7UM62. 19 21
K13+ control K14
15 17
K15+ meas. K16
2) A11
20 kΩ
B11
20 kΩ
B18
20 kΩ
B14
Example: LiYCY 4x1.5
3PP1326 500Ω
4
9 kΩ
TD2
1)
25
generator shaft
1
TD1
7UM62. K17+
2
500Ω
3
10µF 250V
TD3
K18
to further 7UM6 device
1)
The distance between controller unit 7XT71 and protection device 7UM62x should be as short as possible (to be installed in the same cubicle). The connections in between shall be laid closely together and twisted or a screened cable should be used.
2)
connection example for excitation voltages < 850V d.c. (an other connection example for excitation voltages < 1200V d.c. can be found in the Quick reference 7XR6004) : http://siemens.siprotec.de/download_neu/html_nav/ind_acc_e.htm
PTD Energy Automation Product Management
eMail: Phone: Fax :
[email protected] (++49) - 1805 247000 (++49) - 1805 242471
SIEMENS
Page 4 of 6
Date: Sept.-21-2007
Power Transmission and Distribution
Rev.: 7UM62.Inst.20Hz_1-3Hz_en.002.01 NM
7UM62x Installation Instructions for 100% SEF (20Hz) and rotor earth fault (1-3Hz & R,f n)
Example 2: coupling unit 7XR6004 installed inside protection cubicle Protection cubicle 7XT71
7XR6004 20 kΩ
A3
G 3~
A6
27
2)
Excit.
7UM62. 19 21
K13+ control K14
15 17
K15+ meas. K16
TD1
TD2
A11
20 kΩ
B11
20 kΩ
B18
20 kΩ
B14
1)
25
Example: LiYCY 4x1.5
generator shaft
7UM62.
3PP1326 1
500Ω
TD3
2
500Ω
4
9 kΩ
3
K17+
10µF 250V
K18
to further 7UM6 device
1)
The distance between controller unit 7XT71 and protection device 7UM62x should be as short as possible (to be installed in the same cubicle). The connections in between shall be laid closely together and twisted or a screened cable should be used.
2)
connection example for excitation voltages < 850V d.c. (an other connection example for excitation voltages < 1200V d.c. can be found in the Quick reference 7XR6004): http://siemens.siprotec.de/download_neu/html_nav/ind_acc_e.htm
PTD Energy Automation Product Management
eMail: Phone: Fax :
[email protected] (++49) - 1805 247000 (++49) - 1805 242471
SIEMENS
Page 5 of 6
Date: Sept.-21-2007
Power Transmission and Distribution
Rev.: 7UM62.Inst.20Hz_1-3Hz_en.002.01 NM
7UM62x Installation Instructions for 100% SEF (20Hz) and rotor earth fault (1-3Hz & R,f n)
Rotor Earth Fault ( R, fn principle) Example 1: R.M.S value of IR > 0.2 A a.c.
(Thumb rule UExcLoad > 150V)
Protection cubicle 2) 3PP1336 7XR61 1
G 3~
105 Ω
2
3A1
7UM62.
4A1 4 µF 3·33Ω/50W
Excit.
IR 3
105
Ω
3B1 2B1
4B1
4
4 µF 3·33Ω/50W
230V 1A4
0.75 H
0V
generator shaft
1 500Ω
R13 UE
1A1
0 V 1B1
R14
7UM62. TD3
2
500Ω
4 9 kΩ
1B4
2)
3PP1326
IEE1
2A1 1B2 1 1B3
100/ 1A3 125V
J8 J7
3
K17+
10µF 250V
K18 to further 7UM6 device
The internal resistors can not be used in case of higher currents (I R). In the event of large harmonics content in the rotor voltage an external series resistor, type 3PP1336-0DZ-K2Y is recommended for the protection of the coupling capacitors. In this case the internal resistors should be shorted like in t he Figure above. Refer also to “Directions for use 7XR61” (Connection Examples): http://siemens.siprotec.de/download_neu/html_nav/ind_acc_e.htm 1) 2)
In the absolutely most cases there is no need to connect the 0.75 H Inductor. The decision has to be made during hot commissioning. Can be also located inside excitation cubicle
PTD Energy Automation Product Management
eMail: Phone: Fax :
[email protected] (++49) - 1805 247000 (++49) - 1805 242471
Page 6 of 6
SIEMENS
Date: Sept.-21-2007
Power Transmission and Distribution
Rev.: 7UM62.Inst.20Hz_1-3Hz_en.002.01 NM
7UM62x Installation Instructions for 100% SEF (20Hz) and rotor earth fault (1-3Hz & R,f n)
Example 2: R.M.S value of IR < 0.2 A a.c.
(Thumb rule: UExcLoad < 150V)
Protection cubicle
7XR61
7UM62.
3A1
4A1
G 3~
4 µF
Excit.
3·33Ω/50W
IR 3B1 2B1
4B1 4 µF
J8
3·33Ω/50W
J7
IEE1
2A1 1B2 1 0.75 H
230V 1A4
1B4 1B3
100/ 1A3 125V 0V
UE 0 V 1B1
1A1
generator shaft
500Ω
TD3
2
500Ω
4
9 kΩ
R14
7UM62.
3PP1326 1
R13
3
K17 +
10µF 250V
K18
to further 7UM6 device
Refer also to “Directions for use 7XR61” (Connection Examples): http://siemens.siprotec.de/download_neu/html_nav/ind_acc_e.htm 1)
In the absolutely most cases there is no need to connect the 0.75 H Inductor. The decision has to be made during hot commissioning.
PTD Energy Automation Product Management
eMail: Phone: Fax :
[email protected] (++49) - 1805 247000 (++49) - 1805 242471
