Introduction
1.2 Application Scope
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
18
1.2
Application Scope
The 7VK61 breaker management relay is a multi-purpose starting and control device for automatic and manual
closing of circuit breakers in electrical networks of all voltage levels.
The automatic reclose function may be used on overhead lines for single-pole, three-pole or single- and three-
pole automatic reclosure as well as multi-shot automatic reclosure. The adaptive dead times can be set indi-
vidually for single-pole, three-pole auto-reclosure and for additional (up to 8) reclose cycles.
Before reclosure after three-pole tripping, the validity of the reclosure can be checked by synchronism check
by the device (can be ordered optionally). Alternatively, the de-energization of the line or of the busbar can be
checked. If desired, asynchronous energization is also possible. In this case, the device calculates the moment
of the energization command so that the two voltages at busbar and feeder are in phase the instant the circuit-
breaker poles make contact.
The circuit breaker must be suitable for auto-reclosing. For single-pole auto-reclosure the poles must be indi-
vidually controllable. The device considers whether the circuit breaker is ready for a trip and close cycle and its
position - provided this information is supplied by the circuit breaker. The breaker recovery time can be moni-
tored. During single-pole auto-reclosure the relay can either process the parallel connection or the series con-
nection or both connections of the auxiliary contacts at the circuit breaker poles. The relay is furthermore
capable of processing the auxiliary contact of each pole. But generally the relay can operate without such in-
formation from the circuit breaker.
7VK61 can work together with static and digital protection equipment requiring only pickup and trip operations
from them. For single-pole auto-reclosure the trip signals must either be distinguished as to whether they are
single-pole or three pole or they must be transmitted to the relay for each pole separately. In the event of three-
pole auto-reclosure alone a general trip signal is sufficient.
Protective Functions
The 7VK61 features the following basic functions:
• Automatic Reclosure Function
• Synchronism and Voltage Check
• Circuit Breaker Failure Protection
• Voltage Protection
• Time Overcurrent Protection
Control Functions
The device is equipped with control functions which operate, close and open, switchgear via function keys, the
system interface, binary inputs and from a PC with the DIGSI software. The status of the primary equipment
can be transmitted to the device via auxiliary contacts connected to binary inputs. The present status (or posi-
tion) of the primary equipment can be displayed on the device, and used for interlocking or plausibility monitor-
ing. The number of the devices to be switched is limited by the binary inputs and outputs available in the device
or the binary inputs and outputs allocated for the switch position feedbacks. Depending on the primary equip-
ment being controlled, one binary input (single point indication) or two binary inputs (double point indication)
may be used for this process. The switching of primary equipment can be restricted by corresponding settings
of the switching authority (Remote or Local), and by the operating mode (interlocked/non-interlocked, with or
without password request). Interlocking conditions for switching (e.g. switchgear interlocking) can be estab-
lished using the integrated user-defined logic.
Summary of Contents for Siprotec 7VK61
Page 8: ...Preface SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 8 ...
Page 14: ...Contents SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 14 ...
Page 316: ...Literature SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 316 ...
Page 328: ...Glossary SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 328 ...
