Flexible Protection Functions; Description - Siemens SIPROTEC 7SK80 Manual
Motor protection
Hide thumbs
Also See for SIPROTEC 7SK80:
- Manual (512 pages) ,
- Product information (80 pages) ,
- Manual (42 pages)
Table of Contents
Advertisement
2.13
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.
2.13.1
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 2-10 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 selected the setting Vab, Vbc or Vab, Vbc, Vx as connection type for the voltage transformers in
address 213 VT Connect. 3ph.
Table 2-10
Possible Protection Functions
Characteristic
Characteristic / Measured Quantity
Group
Current
RMS value of fundamental
I
component
I
True RMS (r.m.s. value)
rms
3I
Zero sequence system
0
Positive-sequence component
I1
I2
Negative-sequence component
Positive/negative sequence
I2/I1
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
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Protective Function
Overcurrent protection
Undercurrent monitoring
Overcurrent protection
Thermal overload
protection
Undercurrent monitoring
Time overcurrent
protection, ground
Negative sequence
protection
Frequency protection
Frequency change
protection
Voltage protection
Displacement voltage
Voltage protection
Displacement voltage
Displacement voltage
Voltage protection
Voltage asymmetry
Functions
2.13 Flexible Protection Functions
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
reference
81R
27, 59,
X
59G
27, 59,
X
59G
59N
X
27, 59
X
47
X
X
X
X
X
205
Advertisement
Table of Contents
