Underfrequency Load Shedding; Overview Of Functions; Structure Of The Function - Siemens 6MD85 Manual

Protection and Automation Functions

7.20 Underfrequency Load Shedding

7.20 Underfrequency Load Shedding

Overview of Functions

7.20.1
The Underfrequency load shedding function:
•
Detects underfrequencies in the electrical power systems
•
Switches off the medium-voltage busbar or feeders that consume active power to stabilize the frequency
•
Maintains operations for the medium-voltage busbar or feeders that generate active power
7.20.2

Structure of the Function

The Underfrequency load shedding function can be used in the Voltage/Current 3-phase function group
and in the Line function group.
The Underfrequency load shedding function comes factory-set with 8 stages. A maximum of 12 stages can
be operated simultaneously within the function. These stages are identical in structure.
[dw_load shedding_Structure, 1, en_US]
Figure 7-160
834
Structure/Embedding of the Function
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017