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RoadTests & Reviews

21 Posts authored by: three-phase
Introduction Double Pulse Software Test Setup Test Results MOSFET Comparison PWM Signal Tests Conclusions Introduction  My third and final test on the Tektronix AFG31052 Arbitrary Waveform Generator is to investigate the use of the Double Pulse software for testing the performance of MOSFET and IGBT devices. Naturally, I have to try and build in some aspect of an insulation tester into as many of the blogs I write on element14 and the main voltage generation cir ...
Introduction  This aspect of the review is at the core of the reason I applied of this RoadTest. I have an unquenchable thirst for knowledge around partial discharge in high voltage insulation systems, that I had previously experimented with using the MDO34 and attempted to rebuild partial discharge patterns with its built in waveform generator. I had struggled to obtain satisfactory results with this, so I hoped that the increased capabilities of the AFG31052 would overcome the previous c ...
Introduction Sine wave distortion Total harmonic distortion Spurious output measurement Triangular wave linearity Output symmetry Conclusions   Introduction  This is a continuation of the verification tests on the waveform generators and comparing the AFG31052 results to other instruments.     Sine wave distortion  This is another measurement in the verification steps from Tektronix and is further supplemented by a total harmonics distorti ...
Introduction Frequency verification Phase displacement DC offset AC amplitude AC Flatness Test AM Modulation Depth Square Wave Duty Cycle Square wave rise and fall times Who Knew?   Introduction  For the first part of my review, I aim to carry out verification tests on the AFG31052, carry out the same tests on a Rigol DG1022, Uni-T UTG962 and the AWG element of the MDO34 that I also have in my possession. For some of the tests, the Picoscope 340 ...
Introduction RS232 Bus Decoding CAN Bus Decoding LIN Bus decoding MIL-STD-1553 Bus Decoding SPI Bus Decoding USB Bus decoding Conclusions Introduction  This is a set of tests carried out on the Tektronix MDO Demo Board 1 with the 3 Series MDO concentrating on the serial decoding functions within the oscilloscope. The demonstration board has 5 serial signal examples.   UART / RS232 CAN Bus (CAN_H and CAN_L) FlexRay I2C (I2C_CLK and I2C_Data) LIN Bus ...
Introduction Test Setup PDFlex Software Computer connection Update to computer connection 30/01/2020 80 pF capacitive coupler preparations; 132 kV cable preparations; Trigger Modes Conclusion Introduction  This is the last set of experiments I am using the 3 Series MDO with as part of my roadtest. The objective is to carry out further partial discharge testing on some cable samples, however, this test process will allow me to set up faults within the cab ...
Introduction Flux Probe Data Capture from a Generator Off-site Analysis of Waveform Playing the Signal back into the RFA-II Analyser Conclusions Introduction  In this blog I will utilise the 3 Series MDO to collect data from a Flux Probe or Air Gap Search Coil installed inside a generator and utilise the maths within the scope to carry out an analysis of the signal. This test again involves taking the 3 Series MDO out to a location as well as some bench work with a Flux ...
Introduction Capturing PD Pulses from TGA-B Modification of Simulated Pulses Tektronix Arb Software Generator Partial Discharge Measurements 132kV Cable Discharge Measurements Switchgear Partial Discharge Test Conclusions Addendum   Introduction  I plan to utilise the 3 Series MDO to collect partial discharge data from a generator in operation. Opportunity arose to also take readings on some 132 kV cabling from a transformer to a Grid Connection and ...
Introduction Calibration Checks Measurement captures Generator Test Update 18th January 2020 Conclusions   Introduction  For this blog I am going to use the 3 Series MDO to check the performance of a rotor reflectometer. This instrument is utilised on generator rotors to determine the presence of interturn faults within the rotor winding.   To do this the reflectometer applies pulses to each end of the rotor winding in alternating manner and an oscillosco ...
Unboxing Paperwork supplied Passive Probes Digital Probes Build quality of oscilloscope Start-up Scope Probe Compensation Insulation Tester Measurements RF Measurements USB Analysis HDMI Output and remote LAN operation Transport case Conclusions   This is the kick-off of my review of the Tektronix 3 Series MDO to cover the arrival of the unit, unboxing, review of kit contents, and a few basic tests.   Unboxing  The oscilloscop ...
Introduction What is a Data Acquisition System? Market Review Cost of Ownership Module Types Build Quality Power Consumption Tests Performance Tests Operation with the BenchVue software. Summary Introduction  This is my opening blog on the DAQ970A data acquisition unit that I was lucky enough to be selected to road test. This is a general blog, with my intention to introduce the DAQ970A.   I didn't really do an unboxing as they don't do an awfu ...
During my review of the Megger  MIT420/2 insulation tester in Blog 9, I tested a 120MW Generator rotor winding that actually failed the insulation resistance test. Following this issue, the bedplate heaters for the generator were reconnected and placed back into service. Around 4 weeks later, I returned to the generator to carry out a further insulation test with the expectation that the heat would have driven out the moisture from the winding and a healthy insulation reading would be obtai ...
You will all be thankful to know that I have finally reached my last blog in this road test review of the Megger  MIT420/2 Previous blogs have covered bench reviews and tests a teardown and insulation testing from electrical panels on motors and air circuit breakers In this blog I will cover the testing of generator rotor windings from a 92MVA and a 145MVA turbogenerator.     This is the main function of my job and the reason why the road test was of great interest to me. I cur ...
Up to this point the on site tests carried out with the  MIT420/2 have been based around motor tests either from a control centre or direct at the motor terminals Unsurprisingly the instrument has performed very well with the only issues really being around making connections to specific items during the earth test on a large motor and when using the supplied test lead to short out the winding after the tests These are all minor issues and relatives easy to overcome   This blog introd ...
In the previous blog some motors that had been refitted after maintenance were tested from their respective control panels I found that the  MIT420/2 had a few quirks whilst using it but nothing that became a major issue or prevented the instrument from being used In the next blog I am off to the other end of the cable and test out some motors at the actual terminal box Actually I am cheating a bit as I have access to motor stores so I tested a new 4kW motor a refurbished 90kW motor and two ...

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