Functions
2.2 Phase Comparison Protection and Ground Differential Protection
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
52
2.2
Phase Comparison Protection and Ground Differential Protection
The differential protection can be used in solid or resistive grounded, isolated and resonant-grounded systems.
It comprises a phase comparison protection and a ground differential protection. The sensitive ground element
operates directionally or non-directionally.
The following chapter describes the functions
• Differential protection topology
• Phase comparison protection
• Ground current differential protection in grounded systems
• Ground fault differential protection in resonant-grounded/isolated systems
• Differential protection test and commissioning
2.2.1
Differential Topology
The devices at both ends of the protected object communicate over their protection interfaces with one device
acting as master, the other as slave.
The device configured as master can perform the time synchronization for both devices.
2.2.1.1
Setting Notes
Protection Data Topology
At address
4701
ID OF MASTER
and
4702
ID OF SLAVE
you can enter the device identification number of
the two protection devices at the line ends.
Use address
4710
LOCAL RELAY
to define which of the two devices acts as master and which as slave.
If you want the master to perform the time synchronization for both devices, please observe for which of the
two device a stable time signal is available.
2.2.1.2
Settings
2.2.1.3
Information List
Addr.
Parameter
Setting Options
Default Setting
Comments
4701
ID OF MASTER
1 .. 65534
1
Identification number of Master
4702
ID OF SLAVE
1 .. 65534
2
Identification number of Slave
4710
LOCAL RELAY
Master
Slave
Master
Local relay is
No.
Information
Type of In-
formation
Comments
3491
Master Login
OUT
Master in Login state
3492
Slave Login
OUT
Slave in Login state