Siemens 7SC80 Manual page 324

Functions
2.19 Flexible Protection Functions
Characteristic Characteristic / Measurand
Group
Voltage Side 2 V RMS value of fundamental
component
V True RMS (RMS value)
rms
3V Zero-sequence system
0
V Positive-sequence component
1
V Negative-sequence component
2
Power P Real power
Q Reactive power
cos φ Power factor
Binary input – Binary input
1) For information on the function, see Section Jump Detection in this chapter..
The maximum 20 configurable protection functions operate independently of each other. The following
description concerns one function; it can be applied accordingly to all other flexible functions. The logic
Figure 2-109 illustrates the description.
Functional Logic
The function can be switched OFF and ON 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
in this case and function's setting has to be modified.
Blocking Functions
The function can be blocked via binary input (FNo. 235.2110
("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. For voltage-based characteristics,
the function can be blocked if one of the measuring voltages fails. Recognition of this status is either accom-
plished by the device's internal voltage transformer monitor (FNo. 170
2.12.1 Measurement
>FAIL:FEEDER VT and FNo. 6510 >FAIL: BUS VT ). This blocking mechanism can be enabled or disabled
via parameters. The associated parameter BLK.by Vol.Loss is only available if the characteristic is based on
a voltage measurement.
When using the flexible function for power protection or power monitoring, it will be blocked if currents fall
below 0.03· Ι
Nom
Operating Mode, Measured Quantity, Measurement Method
The flexible function can be tailored to assume a specific protective function for a concrete application in
parameters OPERRAT. MODE, MEAS. QUANTITY, MEAS. METHOD and PICKUP WITH. Parameter
OPERRAT. MODE can be set to specify whether the function works 3-phase, 1-phase or no reference,
i.e. without a fixed phase reference. The three-phase method evaluates all three phases in parallel. This
implies that threshold evaluation, pickup indications and trip time delay are accomplished selectively for each
324
Supervision) or via auxiliary contacts of the voltage transformer breaker (FNo. 6509
.
Protection Function
Voltage protection
Displacement voltage
Jump detection 1)
Voltage protection
Displacement voltage
Displacement voltage
Voltage protection
Voltage unbalance
Reverse power protection
Power protection
Jump detection 1)
Power protection
Jump detection 1)
Power factor
Jump detection 1)
Direct coupling
$00 inval.set ) reports this condition. The function is inactive
>BLOCK $00 ) or via local operating terminal
ANSI-No. Operating Mode
3–phase 1–phase
27, 59, X
59G
27, 59, X
59G
59N X
27, 59 X
47 X
32R, 32, 37 X
32 X
55 X
without phase
reference
Fail VT Superv. ; see Section
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
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