Methodical Procedure For Primary Tests Of Functions - Siemens SIPROTEC 5 Manual

Commissioning
9.5 Primary Tests
NOTE
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Before you perform this test, make sure that the respective system part is isolated and a switching opera-
tion can be executed safely.
Check the feedback once you have activated the switching device.
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In the menu, go to Test-suite → Analog inputs and check the voltage and current inputs. The relevant
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measurands must have the value 0 in the de-energized switch position.
Using test equipment parallel to the transformers, feed stationary test quantities.
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Check the measured values. Take note of the absolute value and phase as well as the correct phase
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sequence.
NOTE
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If additional signals such as from a substation automation technology are coupled, perform the corre-
sponding tests (see chapter
9.5.2

Methodical Procedure for Primary Tests of Functions

The scope of primary tests depends on the type of system. To check proper system integration, various
primary tests are performed in power plant systems. The generator delivers the necessary test quantities
based on the operating mode. Refer to the Device manual for generator protection for details.
The scope of inspection is much smaller in power system protection applications. It boils down to a direction
check in the broadest sense. Differential protection tends towards overfunction if there is a sensitive setting
and a wiring error. Each function can be switched to a special mode to avoid unnecessary activation of the
circuit breakers. It is ready to function but the trip command is not switched further (see Function descriptions
in the Device manual). In the desired function, switch the Mode parameter to Test. The trip signal is supplied
with a test bit. The tripping contacts in the device are not activated so the circuit breaker is not actuated by the
protection.
If you enter this setting for the differential protection, make sure that at least one overcurrent protection is
active as backup protection. Once all preparatory measures are complete, you can begin with the actual
primary test.
First check that you can produce a non-critical switch position and that you have a specific power flow.
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The possible load current must be greater than 10 % of the rated load. Avoid a maximum load.
Activate the circuit breaker (for example, with a synchrocheck).
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Check the measured values.
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In online mode, open the Editor Test suite → Analog inputs.
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Check the phasor values of the measuring points in terms of plausibility (amount, phase and phase
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sequence).
Check the phase displacement of the current and voltage phasors with each other.
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Check the operational measured values per function group.
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Check the direction indirectly via the measured values for active and reactive power (Operational indica-
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tions tab.) If the power flow is to the protected object (for example, line) and an ohmic inductive load is
assumed, the active and reactive power must assume positive values. The size of the measured values
determines the current load. If 2 protection devices are connected, both must show the same value.
Click the Fund. comp./sym. comp. tab.
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You can verify the direction of rotation using positive-sequence and negative-sequence system quanti-
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ties. The negative-sequence system quantities must be 0.
If deviations arise during the tests, check the selected settings (for example, current transformer neutral
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point, phase sequence, etc.) and the interface in a 2nd step.
230
9.4 Secondary Tests).
SIPROTEC 5, Operation, Manual
C53000-G5040-C003-C, Edition 08.2020