Siemens SIPROTEC 7SJ61 User Manual

Functions
2.13 Flexible Protection Functions
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
191
2.13 Flexible Protection Functions
The flexible protection function is a generally valid protection function, which application depends on the con-
figuration of different protection principles. A maximum of 20 flexible protection functions can be created. Each
function can be applied as an independent protection function, as an additional protection element of an already
existing protection function or as a universal logic, e.g. for monitoring tasks.
2.13.1 Function 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 indicated in Table 2-11 and the derived protec-
tion functions are available.
Table 2-11 Possible Protection Functions
The maximum 20 configurable protection functions operate independently of each other. The following descrip-
tion concerns one function; it can be applied accordingly to all other flexible functions. The logic diagram in
Figure 2-67 illustrates the description.
Function Control
The function can be switched ON or OFF. The state Alarm Only can also be enabled. In this state the pickup
will not result in a fault and the trip command delay time is not started. Tripping is thus not possible.
If changes of Power System Data 1 are effected after configuration of the flexible functions, it may be possible
that the sequence of the functions is not configured correctly. This is indicated by message (Fno. „$00
inval.set“). This function is not active in this case and the configuration of the function must be adjusted.
Blocking Functions
The function can be blocked via binary input (FNo. 235.2110 „>BLOCK $00“) via local operating terminal
(„Control“ -> „Tagging“ -> „Set“). Blocking will reset the function's entire measurement logic as well as all
running times and indications. Blocking via the local operating terminal may be useful if the function is in a
status of permanent pickup which does not allow the function to be reset.
Characteristic
Group
Characteristic / Measured Quantity Protective Function ANSI No. Mode of Opera-
tion
3-phase 1-phase
Current I RMS value of fundamental
component
Time overcurrent protection 50, 50G X X
I
rms
True RMS (r.m.s. value) Time overcurrent protection
Overload protection
50, 50G X X
3I
0
Zero sequence system Time overcurrent protection,
ground
50N X
I1 Positive-sequence component X
I2 Negative-sequence component Negative sequence protection 46 X
I2/I1 Positive/negative sequence
component ratio
-X
Binary input – Binary input External trip commands without phase
reference

Siemens SIPROTEC 7SJ61 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ61
Category	Controller
Language	English