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
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.
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.
Settings
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
Information List
No.
Information
Type of
Informa-
tion
Comments
3491
Master Login
OUT
Master in Login state
3492
Slave Login
OUT
Slave in Login state
2.2
2.2.1
2.2.1.1
2.2.1.2
2.2.1.3
Functions
2.2 Phase Comparison Protection and Ground Differential Protection
48
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Summary of Contents for SIPROTEC 4 7SD80
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