Flexible Protection Functions (7Sj64 Only); Functional Description - Siemens siprotec SJ62 User Manual

2.17

Flexible Protection Functions (7SJ64 only)

2.17.1 Functional Description

General
Table 2-18 Possible Protection Functions
Characteris- Characteristic / Measured Quanti-
tic Group
Current
I
component
True RMS (r.m.s. value)
I
rms
3I Zero sequence system
0
Positive sequence compo-
I1
nent
Negative sequence compo-
I2
nent
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 compo-
1
nent
V Negative sequence compo-
2
nent
Power P Active power
Q Reactive power
cos ϕ
Power factor
Binary input – Binary input
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
The flexible protection function is a general function applicable for a variety of protec-
tion principles depending on its parameter settings. The user can create up to 20 flex-
ible protection functions. Each function can be used either as an autonomous protec-
tion function, as an additional protective element of an existing protection function or
as a universal logic, e.g. for monitoring tasks.
The function is a combination of a standard protection logic and a characteristic (mea-
sured quantity or derived quantity) that is adjustable via parameters. The characteris-
tics listed in table 2-18 and the derived protection functions are available.
ty
RMS value of fundamental
Section 2.18 gives an application example of the function „reverse power protection".
2.17 Flexible Protection Functions (7SJ64 only)
Protective Function
- Time overcurrent protec-
tion
- Time overcurrent protec-
tion
-
Overload protection
- Time overcurrent protec-
tion, ground
- Negative sequence pro-
tection
- Frequency protection
- Frequency change protec-
tion
- Voltage protection
- Displacement voltage
- Voltage protection
- Displacement voltage
- Displacement voltage
- Voltage protection
- Voltage asymmetry
- Reverse power protection
- Power protection
- Power protection
- Power factor
- External trip commands
ANSI No. Operating Mode
3-phase 1-phase
50, 50G X
50, 50G X
50N X
X
46 X
81U/O without phase refer-
ence
81R
27, 59, 59G X
27, 59, 59G X
59N X
27, 59 X
47 X
32R, 32, 37 X
32 X
55 X
without phase refer-
ence
X
X
X
X
X
X
X
262