5.2.4. Checking Interlocks Mechanically; 5.2.5. Test Operation; Preparing Power-Frequency Voltage Test - Siemens 8BT2 Installation And Operating Instructions Manual

5.2.4. Checking interlocks mechanically

5.2.5. Test operation

Checking
the switching process
and the position
indicators
5.2.6. Preparing the power frequency voltage test (optional)
881-4027.9 * INSTALLATION AND OPERATING INSTRUCTIONS 8BT2 * Revision 04
Check each panel to establish whether the truck can only be racked to SERVICE position
when the circuit breaker and the earthing switch are in OPEN position and the high-
voltage door is closed.
Check the circuit breaker panels to establish whether the circuit breakers can only be
operated when the respective truck is in interlocked end position (TEST or SERVICE
position).
Check all earthing switches to establish whether the earthing switches can only be
operated when the respective trucks are in interlocked TEST position.
Check whether the high-voltage door can only be opened when the truck is in interlocked
TEST position.
With test operation you can check the correct operation of the switchgear before
commissioning without being endangered by operational high voltage.
DANGER!
High voltage! Danger!
If you find out during test operation that a part of the system does not operate in
the way described in this document, you must not put the switchgear into
operation.
DANGER!
High voltage! Danger!
Do not switch on operational high voltage during test operation!
Switch on control voltage.
The motors of the circuit breaker operating mechanisms start up and charge the closing
springs.
Rack each truck from TEST position to SERVICE position and back several times. At the
same time, check whether these positions of the truck are displayed correctly at the
panel and, if applicable, in the control room.
Switch each earthing switch from OPEN to EARTHED position and back several times.
At the same time, check whether these positions are correctly indicated on the panel
and, if applicable, in the control room.
Close and open each circuit breaker several times locally and from remote for test. At the
same time, check whether these positions are correctly indicated on the panel and, if
applicable, in the control room, and whether the auxiliary switches and position switches
operate correctly.
Check the function of the existing shunt closing and shunt opening releases by electrical
operation.
ATTENTION!
If you have determined a malfunction during one of these tests:
Do not put the switchgear into operation.
Inform your regional SIEMENS representative.
If required, a power-frequency voltage test can be performed at site on the readily assembled
switchgear. In this case, make the following preparations:
Remove voltage transformers as well as surge arresters and surge limiters.
Protect bushings of transformers, surge arresters and surge limiters in a surge-proof way
using suitable sealing caps.
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