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
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