Flexible Protection Functions; Description - Siemens 7SC80 Manual

2.19

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.
2.19.1

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
functions are available.
Please note that the power values are not available if you have selected the setting Vab, Vbc as the connec-
tion type for the voltage transformers in address 213 VT Connect. 3ph.
Table 2-22
Characteristic Characteristic / Measurand
Group
Current RMS value of fundamental
Ι
component
True RMS (RMS value)
Ι
rms
3Ι Zero-sequence system
0
Positive-sequence component
Ι1
Negative-sequence component
Ι2
Positive/negative sequence
Ι2/Ι1
component ratio
Frequency f Frequency
df/dt Frequency change
Voltage V RMS value of fundamental
component
V True RMS (RMS value)
rms
3V Zero-sequence system
0
V Positive-sequence component
1
V Negative-sequence component
2
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
Possible Protection Functions
Table 2-22
Protection Function
Overcurrent protection
Undercurrent monitoring
Jump detection 1)
Overcurrent protection
Overload protection
Undercurrent monitoring
Overcurrent protection,
ground
Negative sequence protec-
tion
Frequency protection
Jump detection 1)
Frequency change protec-
tion
Voltage protection
Displacement voltage
Jump detection 1)
Voltage protection
Displacement voltage
Displacement voltage
Voltage protection
Voltage unbalance
Functions
2.19 Flexible Protection Functions
and the derived protection
ANSI-No. Operating Mode
3–phase 1–phase
50, 50G X
37
50, 50G X
37
50N X
X
46 X
X
81U/O without phase
reference
81R
27, 59, X
59G
27, 59, X
59G
59N X
27, 59 X
47 X
X
X
X
X
323