Flexible Protection Functions; Functional Description - Siemens SIPROTEC 4 Manual

Functions

2.18 Flexible Protection Functions

2.18 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.
2.18.1

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 2-20 and the derived protection
functions are available.
Please note that with voltage connection type Vab, Vbc or Vab, Vbc, VSyn or Vab, Vbc, Vx (address
213 VT Connect. 3ph) the power values are only available if you have symmetrical voltage conditions
within the network and address 207 Vol. Symmetry is set to YES (Power System Data 1).
Table 2-15
Characteristic Characteristic / Measured Quantity
Group
Current RMS value of fundamental
Ι
component
True RMS (r.m.s. 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 (r.m.s. value)
rms
3V Zero sequence system
0
V Positive-sequence component
1
V Negative-sequence component
2
dV/dt Voltage change
Power P Real power
Q Reactive power
cos φ Power factor
242
Possible Protection Functions
Protective Function
Time overcurrent protec-
tion
Time overcurrent protec-
tion
Thermal overload protec-
tion
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
Reverse power protection
Power protection
Power protection
Power factor
E50417-G1140-C343-A8, Edition 12.2017
ANSI-No. Mode of Operation
3–phase 1–phase
50, 50G X
50, 50G X
50N X
X
46 X
X
81U/O without phase
reference
81R
27, 59, X
59G, 59N,
59NC
27, 59, X
59G, 59N,
59NC
59N X
27, 59 X
47 X
X
32R, 32, 37 X
32 X
55 X
SIPROTEC 4, 7SJ80, Manual
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X
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X
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