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CAUTION
Tests with voltages that exceed more than 170 V at the voltage input terminals cause an overload of the
input circuits and may only be performed for a short time.
See Technical Data
Afterwards the device has to cool off!
²
When checking pickup values keep in mind:
•
Valid for all voltages is that the secondary settings are done in volts. If primary values were set, these are
to be converted to secondary values via the voltage transformer data.
•
If a single voltage, monitored by the flexible function, is to be tested, check the voltage measuring input
in 1-phase.
•
If the phase-to-earth voltages important, do the testing at the 3-phase voltage measuring inputs; this can
be done 3-phase or 1-phase (after each other for every phase). When testing for voltage decrease the not
tested voltages have to lie above the pickup value, so that triggering can be prevented.
•
If the phase-to-phase voltages are important, 3-phase testing is recommended. Otherwise make sure that
the test voltage lies above both measuring inputs for the connected voltage. When testing voltage
decrease the not tested phase must receive a sufficiently high voltage, so that the voltages connected to
it lie above the pickup value.
•
Tests for positive and negative sequence system voltages are easiest with three-phase symmetrical
testing. The positive sequence system can be obtained by symmetrical test voltages, the negative
sequence system by exchanging two phases. The setting value U
every test voltage against starpoint. For 1-phase testing the positive and negative sequence voltage are
1
/
of the test voltage.
3
•
Testing the zero system can be done 1-phase at any of the three-phase voltage inputs. Zero sequence
voltage is set to 3 · U
•
If a flexible function is configured for frequency monitoring, the pickup value can only be tested with a
voltage source with variable frequency. A special test is not needed, as the device always determines the
frequency from the positive sequence system of the three phase voltages. A possibly wrong allocation of
the measuring quantities for the frequency determination is therefore excluded.
Power Functions
For flexible functions with Power functions test voltages and currents are needed. Voltages are applied to the
three voltage measuring inputs and the currents fed into those current measuring inputs, that the voltages are
assigned according to Section
Important for the load direction and signs:
•
the polarity of the test quantities,
•
setting of the polarity for the current measuring location/side in the test, according to polarity setting
(e.g. Address 511 STRPNT->OBJ M1 for measuring location 1),
•
setting for the sign of power under Address 1107 P,Q sign in Power System Data 2.
For default settings the active power for the three-phase testing with in-phase currents and voltages amounts
to √3 · U
· Ι
test
test
hase value as the power is calculated from the positive-sequence systems, which amount to
currents as well as in the voltages.
Reactive power can only be tested single-phase if a phase displacement between current and voltage is
possible. With three-phase test quantities, reactive power can be simulated by phase exchange, although a
phase displacement between currents and voltages is not possible. The following table gives examples. Here,
the factors for active and reactive power refer to the power S = √3 · U
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
, the test voltage corresponds to the must-pickup value.
0
2.1.4 Power System Data 1
(U
phase-phase). For single-phase testing with in-phase test quantities
test
Mounting and Commissioning
and U
correspond to the magnitude of
1
2
under "Assignment of Voltage Measuring Inputs".
· Ι
. The currents are in phase segre-
test
test
3.3 Commissioning
1
/
of the threep-
9
1
/
each in the
3
369
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