In situ testing of large machines: Alternative methods for conducted emission measurements

Catrysse, Johan; Vanhee, Filip; Knockaert, Jos; Hendrickx, Ivan; Beauvois, Véronique

doi:10.1109/isemc.2008.4652045

Cited by 14 publications

(6 citation statements)

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“…A method proposed for testing the in-situ radiated emissions of large machines was first suggested under a European project known as TEMCA2 carried out in 2003 [11]. The system worked by using a wire stretched over the machine to measure the radiated emissions rather than using a conventional antenna.…”

Section: A Test Wire Methodsmentioning

confidence: 99%

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Using the ‘Test Wire’ Method as an alternative to the CISPR 12 full vehicle measurement method

Paterson

Dawson

2016

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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Abstract-This paper investigates the use of the 'Test Wire Method' in an attempt to reduce the errors in the current CISPR 12 full vehicle radiated emissions tests due to the vehicle directivity . CISPR 12 measurements are performed using a fixed geometrical configuration, this method is different to many other radiated emissions standards where receive antenna height scan and device under test azimuth rotation through 360 degrees is employed in an attempt to maximise the emissions recorded. A 'Test Wire' system was originally suggested as method of performing in-situ radiated emissions measurements on physically large electrical machines. The current CISPR 12 test method potentially under-estimates the emissions levels significantly for a representative body-shell model, the results obtained during measurements of a scale model, using the Test Wire Method are discussed and compared to the standard CISPR 12 methods. The initial findings suggest that using the Test Wire Method may offer an improvement (in the region of 4dB) in the error recorded in determining the maximum amplitude of the emissions signature of the vehicle, within the measurement environment being utilised. It is hoped that by the use of an increased number of configurations of the measurement model, further improvements may be recorded. As this paper describes work in progress the measurement results will be validated using simulations of an EM scale model as the next part of this program.

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Section: A Test Wire Methodsmentioning

confidence: 99%

“…The initial studies into the K Factor (Catrysse et al [11]) were performed using EM modelling techniques, this enabled a full spherical scan of the E field to be performed with relative ease (as opposed to the very time consuming methods that would be used if a physical model were measured).…”

Section: A Test Wire Methodsmentioning

confidence: 99%

Using the ‘Test Wire’ Method as an alternative to the CISPR 12 full vehicle measurement method

Paterson

Dawson

2016

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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“…The Electromagnetic Compatibility (EMC) assessment for Railway is carried out following the IEC 62236 / EN 50121 standard series [1], [2], which define the measurement procedure, the test site, the test conditions and the limits. The electromagnetic interference (EMI) emissions test for the complete vehicle is performed at an outdoors railway infrastructure, which implies important difficulties common with other in-situ measurements [3]- [4] due to the presence of non-stable background noise and varying interferences. Moreover, the rolling stock is evaluated in static conditions and in dynamic mode, circulating at low speed and accelerating and/or braking at the measurement point.…”

Section: Introductionmentioning

confidence: 99%

Full Time Domain EMI Measurement System Applied to Railway Emissions According to IEC 62236-3-1/EN 50121-3-1 Standards

Pous

Azpúrua

Oliva

et al. 2018

2018 International Symposium on Electromagnetic Compatibility (EMC EUROPE)

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This paper studies the advantages of applying timedomain based instrumentation to conduct electromagnetic interference emissions from rolling-stock. In IEC 62236-3-1 or EN 50121-3-1 standards, it is mandatory to measure the railway vehicle in static and in-motion conditions. When conventional frequency sweep instrumentation is employed, difficulties regarding ambient noise variation and the short-duration of worst-case emission modes take place. In Annex B of the standard, a test procedure is described to acquire the worst-case EMI, however, as it is explained at the paper the effective measured time at each frequency is only 0.08 ms in some frequency bands. Hence, multiple movements of the vehicle are needed increasing the uncertainty of the measured source and making difficult to distinguish vehicle EMI from background noise interference. To solve this problem, a Full-TDEMI measurement system is proposed with the availability to increase the effective measured time, reduced the ambient noise variation, the usage of multiple antennas at the same time and the possibility to discard transient interference that should not be evaluated. At the end of the paper, measurements carried out with the time-domain system are shown demonstrating the effectivity of the methodology.

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“…The goal is to perform reliable in-situ electromagnetic interferences (EMI) measurements. It is well known that carrying out radiated and conducted EMI measurements is challenging in large fixed installations scenarios [2][3][4]. In comparison with the tests conducted in an electromagnetic compatibility (EMC) test laboratory, in-situ measurements have a common and meaningful problematic related to the inherent uncontrolled environment conditions.…”

Section: Introductionmentioning

confidence: 99%

Benefits of full time-domain EMI measurements for large fixed installation

Pous

Azpúrua

Silva

2016

2016 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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Abstract-It is difficult to properly evaluate the electromagnetic disturbances generated by large fixed installations because of, i.e., the background noise, unsteady emissions and transient interferences. Those challenging EMC issues have been recently studied in European research projects on improved test methods in industrial environments. In order to overcome traditional in-situ EMI measurement troubles, a novel time-domain methodology is proposed and used in a real fixed installation with large machinery. Firstly, a comparison between the developed measurement system, using an oscilloscope, and an EMI receiver is done in some test-cases for validation purposes. After verifying the accuracy of the measurements, we proceed with the measurement campaign applying the full time-domain methodology. The main benefits of employing the time-domain system are emphasised through the results. It was observed that the some remarkable advantages of the time-domain approach are: triggering by disturbance events, extremely reduce the capturing time, identify on real time the worst emissions modes of the EUT, avoid changes at the background noise and perform simultaneous multichannel synchronous measurements.

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In situ testing of large machines: Alternative methods for conducted emission measurements

Cited by 14 publications

References 0 publications

Using the ‘Test Wire’ Method as an alternative to the CISPR 12 full vehicle measurement method

Using the ‘Test Wire’ Method as an alternative to the CISPR 12 full vehicle measurement method

Full Time Domain EMI Measurement System Applied to Railway Emissions According to IEC 62236-3-1/EN 50121-3-1 Standards

Benefits of full time-domain EMI measurements for large fixed installation

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