paralling device

1. Copyright © Siemens AG 2008. All rights reserved.
Copyright © Siemens AG 2008. All rights reserved.
Siemens Power Academy TD
Using numerical machine and motor protection
Paralleling Devices
7VE61 & 7VE63
Overview, Features, connections

2. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 2
Damaged
stator
winding
Wrong synchronisation leads to large damages
Why the High Reliability Requirements?

3. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 3
M
M
G
Start
Stop
Parameter
group
selection
.
.
.
Paralleling device
7VE6
System
u1 f1
u2 f2
ON command
Balancing commands
Speed
higher-lower
Voltage
higher-lower
Synchronisation of Generators

4. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 4
Synchro-
check
Paralleling
principle CLOSE
CLOSE
Both measuring principle in one device
The CLOSE command results of a
2 out of 2 decision
Paralleling
principle 1
Paralleling
principle 2
Release CLOSE
CLOSE 1 CLOSE 2
High Reliability through dual channel design
7VE 61
7VE 63
11/2-channel
2-channel

5. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 5
Paralleling connection 1 Paralleling connection 2
U = U2 - U1
+
-
f = f2 - f1
 = 2-1
Note:
At the synchronoscope is
the rotation vice versa
+
-
CB
&
U
f
=LB
&
U
f
t=tCB
Para1  Para2
CLOSE
tCB
Para1  Para2
Dual- channel design
Close command forming of the 7VE63 at asynchronous networks

6. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 6
Dual Channel Design and Additional Supervision
Functions Offers a High Safety
ADC 1
U1
U2
U1(2-3)
ADC 2
U1
U2
U2(2-3)
channel 1
channel 2
U1
U2
G
Measuring
principle 1
Measuring
principle 2
control 1
control 2
C
C
CLOSE 1
CLOSE 2
Input circuit
supervision
- Sampling values
- data continuity
- phase rotation
CLOSE
supervision
Running time
between
Close 1 and 2
EIN1 und EIN2
Supervision of
the CLOSE
command
Supervision
transistors
+ relay coil
CB-Coil
+
-
C
C
(Side 1)
(Side 2)

7. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 7
Switching of asynchronous power systems
Check of U, f, 
ON command under consideration of CB-closing time
Switching of synchronous power systems
Check of U, f,  (f  0)
ON command, if all conditions are fulfilled over the adjusted time
Synchrocheck
Release, if U, f,  are fulfilled
Switching at dead bus or dead line
Supervision of voltages U1 and U2
High security at three phase connection
(Multiple supervision)
Function Overview 7VE6

8. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 8
Influence of the voltage and frequency balancing can be clear seen
The Regulation Behaviour can be optimized with RMS
Fault Record

9. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 9
Ua
7VE6
L1 L2 L3
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Ub
Uc
Ud
Ue
Uf
Side 1 (U1)
Side 2 (U2)
Standard Connection (3phase VT)

10. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 10
Connection Example for a Medium Sized Generator
with 7VE61
Ua
7VE61
L1 L2 L3
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
Ub
Uc
Ud
Ue
Uf
U1
U2
BI 6
BI 5
BI 4
BI 3
BI 2
BI 1
F 5
F 6
F 7
F 8
F 9
F 10
R 17
R 18
R 1
R 2
R 3
R 4
R 1
R 2
R 3
R 4
R 7
R 6
R 9
R 8
Live-
contact
R5
F 3
R 5
F 4
R 6
R 7
R 8
R 9
R 10
R 11
R 12
R 13
R 14
R 15
R 16
Voltage m.c.b.
-
+
Start
Stop
Selection Sync-group 1
Paralleling decice failure
Synchronisation is running
Synchronisation is blocked
Synchronisation ON-command
Balancing command for voltage regulator
Voltage higher
Voltage lower
Balancing command frequenz-(speed)
reglulator
Frequency higher
Frequency lower
+
-
Release U1< U2>
+
-
U2
U1
Setting in the matrix
"L" (Low active)

11. Energy Sector
Copyright
©
Siemens
AG
2008.
All
rights
reserved.
Siemens Power Academy TD
15 Numerical paralleling device 7VE6
Using numerical machine and motor protection
Version: C 3_Page 11
 High reliability of the CLOSE command forming through the TWO out
of TWO decision
 11/2- channel design at the 7VE61 (Sync-check + Paralleling
function)
 2-channel design at the 7VE63 (two different paralleling
principles)
 The reliability will be increased with additional supervision principles
 Input channel supervision (samples, jumps, phase rotation)
 Internal synchronous supervision of the two different principles
provide a high security against 2 different devices
 Two channel supervision of the Close relays
Quality Characteristics