The document discusses numerical paralleling devices 7VE61 and 7VE63 from Siemens. The devices synchronize generators and close circuit breakers to parallel power systems. They provide high reliability through dual channel design with two independent measuring principles and a two out of two decision for issuing close commands. Additional supervision functions monitor inputs, internal logic, and close relays to detect faults and ensure safe and reliable paralleling of power systems.

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.
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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