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Functions
2.15 Flexible Protection Functions
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 2-13 and the derived protection
functions are available.
Please note that the power values are not available if you are using capacitive voltage measurement, or if you
have set address 213 VT Connect. 3ph to Vab, Vbc or Vab, Vbc, Vx.
Table 2-13
Possible Protection Functions
Characteris-
Characteristic / Measured Quantity
tic Group
Current
RMS value of fundamental com-
I
ponent
True RMS (RMS value)
I
rms
3I
Zero sequence system
0
Positive-sequence component
I1
I2
Negative-sequence component
Positive/negative sequence com-
I2/I1
ponent ratio
Frequency
f
Frequency
df/dt
Frequency change
Voltage
V
RMS value of fundamental com-
ponent
V
True RMS (RMS value)
rms
3V
Zero sequence system
0
V
Positive-sequence component
1
V
Negative-sequence component
2
dV/dt
Voltage change
224
Protective Function
Overcurrent protection
Undercurrent monitoring
Overcurrent protection
Thermal overload protec-
tion
Undercurrent monitoring
Time overcurrent protec-
tion, ground
Negative sequence protec-
tion
Frequency protection
Frequency change protec-
tion
Voltage protection
Displacement voltage
Voltage protection
Displacement voltage
Displacement voltage
Voltage protection
Voltage asymmetry
Voltage change protection
E50417-G1140-C344-A5, Release date 11.2012
ANSI No. Mode of Operation
Three-
Single-
phase
phase
50, 50G
X
37
50, 50G
X
49
37
50N
X
X
46
X
X
81U/O
without phase refer-
ence
81R
27, 59, 59G
X
27, 59, 59G
X
59N
X
27, 59
X
47
X
27R, 59R
X
SIPROTEC, 7SK80, Manual
X
X
X
X
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