Siemens siprotec SJ62 User Manual page 272

Table 2-21 Parameter in dialog box "Measurement Method", 1-phase operation
Operating Measured
Mode Quantity
1-phase Current,
Voltage
Current
Voltage
P forward,
P reverse,
Q forward,
Q reverse
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Parameter
MEAS. METHOD
Setting option
Fundamental wave
True RMS
Parameter CURRENT
Setting option
Ia
Ib
Ic
IN
INs
Parameter VOLTAGE
Setting option
Vab
Vbc
Vca
Vag
Vbg
Vcg
VN
Parameter POWER
Setting option
Ia Vag
Ib Vbg
Ic Vcg
Note
In single-phase voltage protection, the configured voltage threshold is always inter-
preted as voltage at the terminal. The setting in 213 VT Connect. 3ph (Power
System Data 1) is ignored in this case.
Forward direction of power quantities (P forward, Q forward) is in direction of the line.
The flexible function ignores parameter (1108 P,Q sign) for sign inversion of the
power display in the operational measured values.
Parameter PICKUP WITH specifies whether the function picks up on undershooting
or overshooting of the configured threshold.
2.17 Flexible Protection Functions (7SJ64 only)
Only the fundamental wave is evaluated, harmonics are sup-
pressed. This is the standard measurement method of the protec-
tion functions.
The „true" r.m.s value is determined, i.e. harmonics are evaluated.
This procedure is used for, example, if a simple overload protection
is realized on the basis of a current measurement since harmonics
contribute to thermal heating.
It is determined which current measuring channel will be evaluated
by the function. According to device variant, either IN (normally
sensitive ground current input) or INs (sensitive ground current
input) are available.
It is determined which voltage measuring channel will be evaluated
by the function. When selecting a phase-to-phase voltage, the
threshold must be set as phase-to-phase value; when selecting a
phase-to-ground value as phase-to-ground voltage. The scope of
the function texts depends on the voltage transformer connection
(see address 213 VT Connect. 3ph).
It is determined which power measuring channel (current and volt-
age) will be evaluated by the function. The parameter is hidden if
phase-to-phase voltages are connected (see address 213 VT
Connect. 3ph).
Notes
270