Siemens SIPROTEC 7SJ80 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 2-20 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 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
Time overcurrent protec-
tion
50, 50G X X
Ι
rms
True RMS (r.m.s. value) Time overcurrent protec-
tion
Thermal overload protec-
tion
50, 50G 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, 59N,
59NC
X X
V
rms
True RMS (r.m.s. value) Voltage protection
Displacement voltage
27, 59,
59G, 59N,
59NC
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 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
2.18
2.18.1
Functions
2.18 Flexible Protection Functions
242 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017

Siemens SIPROTEC 7SJ80 Specifications

General

Rated Frequency	50/60 Hz
Rated Current	1 A / 5 A
Operating Temperature	-25°C to +55°C
Storage Temperature	-40°C to +70°C
Current Transformer Inputs	4
Application	Protection of feeders, motors, transformers, and generators
Rated Voltage	100-240 V AC/DC
Communication Protocols	IEC 61850, Modbus, DNP3, IEC 60870-5-103
Display	Graphical LCD
Mounting	Flush mounting
Protection Functions	Overcurrent, Earth fault
Communication Interfaces	Ethernet, RS485
Housing	Plastic
Weight	Approx. 1.5 kg