Train and railways are operated either with DC or AC power. They are operated at different voltage levels (250V up to 66kV) and different line frequencies (16.7Hz, 25Hz, 50Hz, 60Hz). The trains get the power whether via a pantograph which is connected to overhead lines or via a conductor rail (third rail). Testing the power supply system of trains requires a high-precision DAQ system that supports a wide range of input signals like voltage, current, displacement, acceleration, GPS parameters, CAN-bus data and video. Especially video data which are synchronised to the other signals are very important and useful for comprehensive analysis (Monitoring connection of pantograph to overhead line, interaction of rails and conductor rail etc.). In addition to the high voltages also high operating currents up to 8000A are present which require special current transducers (AC and DC).
|12 kV||25 Hz / 1 ~||USA|
|15 kV||16,7 Hz / 1 ~||Germany, Austria, Switzerland, Sweden, Norway, ...|
|20 kV||50 Hz / 3 ~||Transrapid|
|25 kV||50 Hz / 1 ~||France, India, Russia, Turkey, UK|
|25 kV||60 Hz / 1 ~||USA, Korea|
|50 kV||50 Hz / 1 ~||South Africa|
|250 V||DC||Mine Railway|
|500 V||DC||Mine Railway|
|600 V||DC||USA, Japan|
|750 V||DC||Germany, USA, Japan, UK|
|1200 V||DC||USA, Switzerland|
|1500 V||DC||USA, Spain, Japan, France, Germany, ...|
|3000 V||DC||Russia, Italy, Span, Belgium|
Short-circuit analysis at railway power supply systems is a typical application for the Transient recording function of the Dewesoft power analyser. At the expansion of short-circuits in railway power supply systems it is often assumed that the short-circuit current is spit in thirds. One third flows via the return conductor, one third via the rail track and one third in the earth. In reality the results differs a lot and strongly depends on the ambient conditions (soil, grounding, etc.). The Dewesoft Power Analyser allows measuring the expansion of the short-circuit with automatic evaluation. Parameters like peak current, AC and DC part of the short circuit, time of the short circuit and a lot more can be calculated. Furthermore high-speed cameras and thermal imaging cameras can be connected to the system for comprehensive analysis.
The electrical power for aircraft systems is provided either by a third rail or an overhead line via a pantograph as described before. Inside the rail the power has to be trans- formed to allow the operation of the different equipment. Typically, a train at first transforms the high supply voltage (e.g. 15 kV) down to a lower voltage range (< 1000 V). Then the power is further transformed to different voltage levels and inverted to different frequencies (e.g. 16.7 Hz, 50Hz, DC). Testing the power system of railways therefore needs a high channel count and the possibility to analyse at dif- ferent voltage levels and frequencies.
The electromagnetic compatibility between electrical devices and systems in aircrafts is of essential importance. Standards like the EUROCAE ED-14D and ABD0100.1.8 have been established to define limits for harmonics. The harmonics are defined in ranges up to 150 kHz. The DEWESoft Power Analyser can handle voltage and current signals up to 250kHz. The analysis can be done for all fundamental frequencies starting from 0.5Hz up to 3000Hz (fundamental frequency in aircraft applications starts from 360Hz up to 800Hz).
The electrical power for aircraft systems is provided by the generators of the engines. Every generator supplies a certain part of the aircrafts power system. There is no parallel operation of the generators. If one generator fails, another one must take over immediately. Should all generators fail, the auxiliary power unit generator (APU) can power the whole aircraft (or parts of it). Even if the APU fails, there is still an emergency battery, that can provide enough power for an emergency landing.
Comprehensive and simultaneous power system analysis of aircrafts affords a high number of voltage and current measurements. Conventional power analysis methods often require many separate measurement devices which means a high effort to aggregate the data and tedious post synchronisation.
The SIRIUS R8D solves all these problems in only one device: you can connect all required input channels to the SIRIUS R8D, so that they are perfectly synchronised, and DEWESoft® can already show the analysis results during measurement.
Electrical power system of ships includes a couple of electrical equipment (motor, generator, pumps, etc.) which are operated at different voltage levels and frequencies. Testing of the whole power system needs a high number of voltage and current measurements for the power analysis. Using conventional measurement equipment requires using a number of measurement equipment and needs a high effort to aggregate and synchronise the data. Due to the unique system architecture of the Dewesoft Power Analyser it is possible to fulfil a number of measurement applications with just one device. The DEWESoft Power analyser combines all functionalities of an Oscilloscope, a Data logger, a FFT spectrum analyser, a Transient Recorder and a common Power Analyser. In combination with the powerful hardware and the high number of input channels comprehensive analysis of the whole ship’s power system are possible.
The high accuracy (0.05 %), high sampling rate (up to 1 MS/s) and high band- width (2 MHz) of the Sirius high-voltage and low-voltage input amplifiers guarantee detailed analysis for wide band applications (frequency inverter analysis, efficiency and energy analysis, frequency monitoring, and a lot more). The power analysis can be done for different wiring schematics (DC, 1-12 phase AC) and also for different fundamental frequencies (50 Hz, 60 Hz, 400 Hz, 800 Hz, variable frequency). It is possible to do multiple power analysis within just one device. The acquisition of any additional analogue and digital signals as well as the possibility for combined Combustion analysis (see E-Mobility) characterise the unique testing possibilities.