Baur SSG 1100, Руководство пользователя

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14
Preparing test object

Isolate the test object

Lock against reconnection

Make sure that zero voltage condition exists.

Insulate nearby items which are under voltage
It must be assured that nearby items of the station or cable system under voltage do not
result in breakovers or breakdowns, due to applying surge or D.C. voltage of the surge
generator to the test object.

Connect all strands in the cable station, with the exception of the fault afflicted strand, to
the station earth.
Attention! Wire size and insulating capacity of the cable system must be in an appropriate
relationship to the amplitude of surge voltage and to the surge energy. Otherwise,
overloading to the still intact parts of the system might occur.
Connecting the protective ground

Connect the surge voltage generator with the station ground through the protective ground
connection (19) on the rear plate of the device.
Attention! Connect the protective ground cable as close to the station ground
connection as possible (see connection examples on page 13).
The protective earth lead should be kept as short as possible and must have low impedance
(min. cross section 10 mm
²
, copper).
Connecting the operating ground
The high voltage connection cable screen is used as operating ground.
The operating ground closes the electric circuit and is used for the return
cable of the impulse current!
Connect the operating ground carefully because it must withstand the full
surge current. Observe the correct terminal position!

Connect the high voltage connection cable screen (operating ground connection) to the
station ground. Select the location for the connection of the screen to the station ground as
follows:
- as close as possible to the location where the test object screen is connected to the
station ground and
- as close as possible to the location where the test object conductors that will not be
tested are connected to the station ground (see connection examples on page 13).