Siemens SIPROTEC 7SD80 User Manual

Functions
2.15 Flexible Protection Functions
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
183
2.15 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.
2.15.1 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
Characteris-
tic Group
Characteristic / Measured Quantity Protective Function ANSI No. Mode of Operation
Three-
phase
Single-
phase
Current I RMS value of fundamental com-
ponent
Overcurrent protection
Undercurrent monitoring
50, 50G
37
XX
I
rms
True RMS (r.m.s. value) Overcurrent protection
Thermal overload protec-
tion
Undercurrent monitoring
50, 50G
49
37
XX
3I
0
Zero sequence system Time overcurrent protec-
tion, ground
50N X
I1 Positive-sequence component X
I2 Negative-sequence component Negative sequence protec-
tion
46 X
I2/I1 Positive/negative sequence com-
ponent ratio
X
Frequency f Frequency Frequency protection 81U/O without phase refer-
ence
df/dt Frequency change Frequency change protec-
tion
81R
Voltage V RMS value of fundamental com-
ponent
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
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 refer-
ence

Siemens SIPROTEC 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SD80
Category	Protection Device
Language	English