Setting Notes - Siemens siprotec SJ62 User Manual

2 Functions

2.17.2 Setting Notes

General
Measured Quantity
Measurement
Method
267
The Device Configuration allows the user to specify the number of flexible protection
functions to be used (see also chapter 2.1.1). If a flexible function is disabled in the
Device Configuration (removing the checkmark), all settings and configurations asso-
ciated with this function are deleted or reset to their default values.
The „General" dialog box in DIGSI offers parameter FLEXIBLE FUNC. which can be
set to OFF, ON or Alarm Only. In Alarm Only mode, the function does not open
fault logs, initiate „Active" indications or trip commands and nor does it influence the
breaker failure protection. This operating mode is therefore preferable if a flexible
function is not desired to work as protective function. Besides that the OPERRAT.
MODE can be configured:
3-phase – The functions evaluate the three-phase measuring system, i.e. all three
phases are covered in parallel. A typical example is the three-phase time overcurrent
protection.
1-phase – The functions evaluate only the individual measured value. This may be an
individual phase value (e.g. V
If set to no reference, the measured values are evaluated irrespective of whether
current and voltage are connected in one or three phases. Table 2.17 provides an
overview of which characteristics can be operated in which mode.
In the „Measured quantity" dialog box, the user can select the measured value the pro-
tective function evaluates. This value may be calculated or measured directly. The
offered setting options depend on the type of measured value processing in parameter
OPERRAT. MODE (see following table).
Table 2-19 Parameters "Operating Mode" and "Measured Quantity"
Parameter OPERRAT. MODE
Setting
1-phase,
3-phase
without reference
The measurement methods listed in the following tables can be set for the measured
quantities of current, voltage and power. They also indicate how the available mea-
surement method, depend on the selected operating mode and the measured quanti-
ty.
) or a ground quantity (V
B
Parameter MEAS. QUANTITY
Current
Voltage
P forward
P reverse
Q forward
Q reverse
Power factor
Frequency
df/dt rising
df/dt falling
Binray Input
or I ).
N N
Setting option
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015