Application Scope - Siemens SIPROTEC 7SS60 Manual

Introduction
1.2

Application scope

1
Figure 1-3 1 / - circuit
2
1-6
The 7SS60 busbar protection is an easily settable numerical differential current pro-
tection for busbars.
It is suitable for all voltage levels and can be adapted to a large variety of busbar con-
figurations. The components available are designed in particular for:
• 1
1
/ - circuit breaker systems
2
• single busbars (with/without sectionalizing isolators)
• double busbars with sectionalizing isolators, longitudinal couplers and transversal
couplers
These types of systems are shown in the following figures.
Single-phase measurement can be achieved by using external summation current
transformers. The use of matching transformers allows phase-selective measure-
ment.
For extra security, an additional measuring system (check zone) can be implemented.
The busbar protection system is designed to be the successor of the 7SS1 static bus-
bar protection. Where it replaces this system, the existing matching transformers and
summation current transformers can be used with the new system as well
BB1
BB2
breaker system
.
7SS60 Manual
E50417-G1176-C132-A2