Siemens 8DA - Checking Electrical Connections; Checking High-Voltage Connections; Checking Protection against Environmental Influences; Checking the Circuits of the Low-Voltage Equipment

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Leakage test ! 24 hours after having filled the gas compartments, check all flange connections
mounted at site and all SF
6
-pipes for leaks.
! For leak detection, use an SF
6
-leak detector.
! In case of gas leaks, these points must be disassembled and sealed again.
Checking the gas quality
! Check the gas quality 24 hours after filling the gas compartments.
! Determine the maximum dew point with a gas hygrometer. Dew-point
temperature: -15
o
C.
! Check the air content in the SF
6
-gas with a gas-percentage meter.Maximum air
content: 5%.
! If the gas quality is not achieved, the gas filling must be cleaned with the
maintenance unit.
Monitoring the gas pres-
sure
! After commissioning, check the gas pressures daily for a period of two weeks. If the
gas pressures drop within this period of time, please inform the Siemens Service
Centre.
! After this period of time, check the gas pressures according to the maintenance
instructions.
13.2 Checking the circuits of the low-voltage equipment
! Check the current transformer circuits according to the circuit diagrams.
! Check the voltage transformer circuits up to the m.c.b. or the fuse for short-circuits.
! Check the functions of all protection devices with a secondary test unit for relays.
13.3 Checking high-voltage connections
! Check the tightening torque of the bolts of the cable plugs according to the
manufacturer's instructions.
! Check the earthing of the cable termination on all high-voltage cables.
13.4 Checking electrical connections
Checking device connec-
tions
! Check the screw-type connections of the devices in the low-voltage compartment at
random with the torque wrench.
! Check the plug-in connections of the devices in the low-voltage compartment at
random.
Checking auxiliary cable
connections
! Check auxiliary cable connections on devices and terminal blocks at random.
! Check all auxiliary cable connections on current transformer terminals including
slides and jumpers in the low-voltage compartment.
! Check the designation labels on the terminal blocks.
! Replace missing labels using the information given in the circuit diagrams.
13.5 Checking protection against environmental influences
For touching up doors and front parts there is a touch-up set (spatula and paint) available,
as well as a paint pen.
! Touch up surface damages.