Siemens SIPROTEC 4 7SD80 User Manual

Flexible Protection Functions
The flexible protection function is applicable for a variety of protection principles. The user can create up to 20
flexible protection functions and configure them according to their function. Each function can be used either
as an autonomous protection function, as an additional protective element of an existing protection function
or as a universal logic, e.g. for monitoring tasks.
Functional Description
General
The function is a combination of a standard protection logic and a characteristic (measured quantity or derived
quantity) that is adjustable via parameters. The characteristics listed in Table 2-6 and the derived protection
functions are available.
Please note that no power values or frequency values are available if you are not using a voltage connection.
Table 2-6 Possible Protection Functions
Characteristic
Group
Characteristic / Measured Quantity Protective Function ANSI-No. Mode of Operation
3-phase 1-phase
Current
Ι
RMS value of fundamental
component
Overcurrent protection
Undercurrent monitoring
50, 50G
37
X X
Ι
rms
True RMS (r.m.s. value) Overcurrent protection
Thermal overload protec-
tion
Undercurrent monitoring
50, 50G
37
X X
3Ι
0
Zero sequence system Time overcurrent protec-
tion, ground
50N X
Ι1
Positive-sequence component X
Ι2
Negative-sequence component Negative sequence protec-
tion
46 X
Ι2/Ι1
Positive/negative sequence
component ratio
X
Frequency f Frequency Frequency protection 81U/O without phase
reference
df/dt Frequency change Frequency change protec-
tion
81R
Voltage V RMS value of fundamental
component
Voltage protection
Displacement voltage
27, 59,
59G
X X
V
rms
True RMS (r.m.s. value) Voltage protection
Displacement voltage
27, 59,
59G
X X
3V
0
Zero sequence system Displacement voltage 59N X
V
1
Positive-sequence component Voltage protection 27, 59 X
V
2
Negative-sequence component Voltage asymmetry 47 X
dV/dt Voltage change Voltage change protection 27R, 59R X
Power P Real power Reverse power protection
Power protection
32R, 32, 37 X X
Q Reactive power Power protection 32 X X
cos φ Power factor Power factor 55 X X
Binary input – Binary input Direct coupling without phase
reference
2.15
2.15.1
Functions
2.15 Flexible Protection Functions
SIPROTEC 4, 7SD80, Manual 167
E50417-G1100-C474-A2, Edition 02.2018

Siemens SIPROTEC 4 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7SD80
Category	Power distribution unit
Language	English