Baur SSG 500, Operating Instructions Manual, Page: 8 / 32

1-2
1. Product Information
Instruments of the SSG family are rack mounting units in the 19"
format. Various operating and indicating elements are mounted on
the front panel, connecting elements are mounted on the back-
plate. The instruments contain their own high voltage generator,
impulse-proof surge capacitors, automatic and manually triggered
spark gaps and an internal discharge device.The instrument control
contains the necessary safety circuits also for connection of an
external Emergency Stop unit and for the operation of the SA 32
option.
The mains voltage is applied to the primary winding or a tapping of
the primary winding of the high voltage transformer via the
reduction switch (13), depending on its position.The secondary
windings of the high voltage transformer features four high voltage
windings, fully isolated of each other, which are connected each to
a partial capacitor through a half-wave rectifier. With the aid of the
range selector switch (6) the partial capacitors become connected
to each other. The series connection allows a maximum voltage of
16kV. The connection of two capacitors each in series and parallel
allows a maximum 8kV and the complete parallel connection of the
capacitors leads to a maximum voltage of 4kV. In this configuration
it can be accomplished, that the maximum surge energy of the
capacitors is available in three voltage ranges. Through the
selection of the three ranges 3 / 6 / 12kV using the reduction switch
(13) 56% of the surge energy are available.
The Surge Voltage Generator SSG 500 is designed in such a way
that it generates pulse-shaped voltages with a steep edge, which
should start to break down the cable fault. The high surge current
flowing at the cable fault generates electromagnetic and acoustic
waves which radiate from the cable fault. These waves can be
detected on the ground surface with appropriate detection devices
such as search coils or ground microphones. The SSG 500
however can also be implemented for pre-location. In this case it is
used as burn down device for short time operation or it can be used
with an echometer and the SA 32.
Design and function
Design
High voltage generation
Function