REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04
REF542
plus
: Installation and Commissioning
38 / 80
To test the phase sequence, set every phase separately to the rated value and then
check the value on the LC display screen. At the end reset the phase to zero.
Generate one symmetrical system each for current and voltage with the rated values.
Check the calculated values. A three-phase current and voltage tester is recom-
mended to test the power. By changing the phase angle between the current and the
voltage system the calculation of reactive and effective values and of cos
ϕ
can be
checked.
5.7 Testing the protective functions
To ensure that no damage has been caused by transport or setup and installation of
the protection equipment and systems, secondary tests are run on the REF542
plus
protection and control unit with the configured protective functions.
Warning!
Always observe the applicable safety regulations when conducting the secon-
dary test with an appropriate test set.
Caution
When testing ensure that the limit values of the measuring inputs and the auxil-
iary voltage supply are not exceeded.
Secondary function tests are recommended during commissioning of the protective
functions.
The activated and configured automatic auto reclosure and also other functions of the
complete system and the power circuit-breaker should be tested to ensure safe op-
eration of these functions.
The following points are particularly important for protective functions that must work
in connection with a set direction or energy flow quantity.
Checking the sensor and transformer connections and wiring check of the station cir-
cuit diagram
Determining the transformer direction
Connection and documentation of the test set
Testing and documentation of the measured value recording
Setting parameters for the protective functions
Recording the test settings
To monitor the test of the correct direction of the specific protective functions in com-
parison with the measured power and power factors in the event of a later primary
test, the following information should be documented in the secondary tests:
Directional setting of the test set
Measurement of the effective and reactive power and of the cos
ϕ
factor
Directional setting of the measurement and protective functions
