Siemens SIPROTEC 7RW80 User Manual

Functions
2.6 Flexible Protection Functions
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
79
2.6 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.
2.6.1 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 2-6 and the derived protection
functions are available.
Table 2-6 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 2-20
illustrates the description.
Functional Logic
The function can be switched ON and OFF or, it can be set to Alarm Only. In this status, a pickup condition
will neither initiate fault recording nor start the trip time delay. Tripping is thus not possible.
Changing the Power System Data 1 after flexible functions have been configured may cause these functions
to be set incorrectly. Message (FNo.235.2128 „$00 inval.set“) reports this condition. The function is in-
active in this case and function's setting has to be modified.
Group of Char-
acteristic
Values
Characteristic value / Measured value Protection Function ANSI No. Mode of Operation
3-phase Single-
phase
Voltage V RMS value of fundamental com-
ponent
Voltage Protection (27, 59)
Displacement Voltage
27, 59, 59G X X
V
rms
True RMS (r.m.s. value) Voltage Protection (27, 59)
Displacement Voltage
27, 59, 59G X X
3V
0
Zero sequence system Displacement Voltage 59N X
V
1
Positive-sequence component Voltage Protection (27, 59) 27, 59 X
V
2
Negative-sequence component Voltage Asymmetry 47 X
dV/dt Voltage change Voltage change protection X
Frequency f Frequency Frequency Protection 81
O/U
81U/O without phase refer-
ence
df/dt Frequency change Frequency Change Protec-
tion
81R
binary input – binary input Direct coupling without phase refer-
ence

Siemens SIPROTEC 7RW80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7RW80
Category	Relays
Language	English