Baur SSG 1100, Руководство пользователя

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12
DC operation
The Surge Voltage Generator can be put into D.C. operation via the
mode selector switch (6).

Turn mode selector switch (6) to the fully right position =.
- The shorting bar bridges the spark gap and as a result the
H.V. output is directly connected with the surge capacitor.

Fault location
In D.C. operation, with the surge capacitors connected, the voltage is increased until the cable
fault breaks down. This mode of operation is recommended especially for estimating the
breakdown voltage in order to conduct an optimal range selection for the
impulse operation. In combination with the SA 32 option and the echometer, the D.C. operation
can also be implemented in prelocating of cable faults.
Testing
D.C. voltage tests can also be conducted in the D.C. operation. It is however important that the
connected surge capacity, in case of a breakdown, is discharged through the fault location and
that the surge generator switches to burn down operation. The instrument
protects itself from overloads switching off automatically after a certain time by the overload
protection switch (14). During short term operation, maximum output currents can be found during
the burn down process according to the following table.
max. output current (IMAX)
Range selector switch SSG 1100 SSG 1500 SSG 2100 SSG 3000
in 8 kV position 560 mA 850 mA 850 mA 850 mA
in 16 kV position 280 mA 425 mA 425 mA 425 mA
in 32 kV position 140 mA 210 mA 210 mA 210 mA
In connection with the Intercom SA 32 (option) with mA-meter the output current can be measured
and be adjusted by changing the output voltage through variable transformer (11). Additionally,
there is a possibility to limit the output current by a high-power resistor.