A programmable high current source with 50 A from DC to AC
The DC generators are driven by hydraulic motors: they are powered by a hydraulic pump installed on a Mercedes-Benz Unimog. The pump generates an electrical output of up to 36 kW. The generators are installed on a trailer for easier operation when moving the whole set up from one position to the next, e.g. when advancing a dipole.
The generator is controlled by a PC with a multifunctional analogue/digital I/O card. The desired power function and the precise number of periods are passed to a newly developed amplifier via the analogue output of the card. This controls the excitation of the current of the main generator. The I/O card also controls the overall system. The flexible interconnection of several generators enables adjustment to different resistances between the C1 and C2 power electrodes. The maximum output is 36 kW.
Technical data of the transverter
Eingang
- Voltage: 380 V, 3 phases
- Frequency: 50 Hz
- Max. current: 65 A
- Max. power: 43 kVA
Output
- Voltage (max.): ± 1500 V DC
- Current (max.): ± 50 A DC
- Max. power: 40 kW
- Frequency: DC to 100 Hz
Manufacturer IE Power Inc., Canada
The generator is controlled by a PC with a multifunctional analogue/digital I/O card. The desired power function and the precise number of periods are passed to a newly developed amplifier via the analogue output of the card. This controls the excitation of the current of the main generator. The I/O card also controls the overall system. The flexible interconnection of several generators enables adjustment to different resistances between the C1 and C2 power electrodes. The maximum output is 36 kW.
Measuring equipment
- dipole-dipole-measurements, 2D and 3D
- Schlumberger soundings with large AB > 10 km
- inverse Schlumberger soundings
- IP-measurements
- Mise-à-la-Masse
- gradient arrays
Exemplary Application
In the frame of the gebo project G2 we carried out dc resistivity measurements in the Leinetal fault system south of Northeim. Besides multielectrode measurements a large-scale dipole-dipole experiment was conducted using the high voltage generator as current source and independent potential registration using the Geolore data logger. On a profile of approx. 2500 m length injections with 200m dipole length were realized and observed by 50 m dipoles.
On the right hand side we see an injection with 40 A. Moreover, the voltages in a distance of 600 m and 2000 m are shown. The latter shows different disturbances, both long-periodic and from the express railway line in a few km distance.
This example shows an injection with a relatively low current due to bad electrode coupling conditions. We can observe high-frequency disturbances caused by the transverter itself, which are not injected into the ground.Those high-frequency noise shows mainly for square wave signals but are negligible for sine waves.
In the voltage of the dipole in 1500 m distance we see significant disturbances, both technical and tellurical.
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