Vibration And Shock Tests On A Typical Current Transformer Set
Vibration and Shock tests ona typical Current Transformer SetFR409P11Mastering Electricitywww.eleq.com
Nationaal Lucht- en RuimtevaartlaboratoriumNational Aerospace Laboratory NLRNLR-CR-2009-412Vibration and Shock tests on a typical CurrentTransformer SetIssueR.A. GrijpmaThis report is a summary of reportNLR-CR-2009-412, 153 pages, issued bythe National Aerospace Laboratory NLR.The complete report is available on request.ELEQ reference: FR409P11No part of this report may be reproduced and/or disclosed, in any form or by any means without the priorwritten permission of the owner.CustomerELEQ Steenwijk B.V.Contract number848586OwnerELEQ Steenwijk B.V.Division NLRAerospace Systems & ApplicationsDistributionLimitedClassification of titleUnclassifiedApproved by:AuthorReviewerManaging department
NLR-CR-2009-412SummaryThis document contains the description and the results of vibration and Shock tests, performedfor ELEQ Steenwijk B.V. on a typical current transformer set.The tests have been executed in order to verify the performance characteristics of thetransformer in environmental conditions representative of those which may be encounteredduring transport and operation of the equipment.The tests were performed on August 5th and 6th, 2009, in accordance with IEC 60068-2-6, IEC60068-2-27 and MIL-STD-810G.The transformer successfully completed the vibration and shock tests according to IEC 600682-6, IEC-60068-2-27 and MIL-STD-810G. The test in accordance with MIL-STD-810Grepresented a vibration profile corresponding to 500 miles transportation in a compositewheeled vehicle.Before and after the vibration and shock test the transformer was electrically characterized.These measurements for this characterization were performed at the ELEQ Steenwijk B.V.premises under witnessing of Mr. E. Wegkamp of the ASAS department of the NLR. Nosignificant change was indicated during these measurements. The measured values were withinthe normal expected distribution. The unit under test successfully passed the referencedvibration and shock tests, without measurable or visible loss of functional or physicalcharacteristics.Mr. D. Baars and Mr. R. Zelhorst of ELEQ Steenwijk B.V. witnessed the vibration and shocktests in the longitudinal direction.3
und71.2Test object identification7Test procedures and specifications82.1Test conditions82.2Resonance survey test82.3Sine vibration test82.4Random vibration test92.5Shock test102.6Concluding functional testing10Test results113.1Incoming inspection143.2Test Conditions143.3Resonance Survey test163.4Sine vibration173.5Random vibration test173.6Shock test173.7Concluding functional testing18Conclusions19References19Appendix AEquipment List21Appendix BFigures22Appendix CTransformer characterization measurement results152Appendix DDVD Test data1534
celeration Power Spectral DensityASASAerospace Systems & applications; Avionics SystemsASAQAerospace Systems & applications; Avionics development and QualificationAvCAverage ControldBdeciBelgAcceleration due to gravity, equal to 9.81 rational ShockPKPeakResResonanceRSResonance SurveyRMSRoot Mean SquareSeqSequenceS/NSerial NumberTSTest Sequence5
NLR-CR-2009-4121 Introduction1.1 BackgroundThe test object is a typical example of a Current Transformer Set. ELEQ Steenwijk B.V.produces a range of transformers differentiating in weight and dimensions. The selected CurrentTransformer Set is of average weight and has a relative high "height to width ratio", which isexpected to be worst case for vibration and shock testing. The used transformers are alsoaverage in wire thickness, winding numbers and core material.1.2 Test object identificationUnder contract of ELEQ Steenwijk B.V., vibration and shock tests were performed on the testsample, identified as:Type: Current transfomer setRef: CTS 43096, Project DS4087Serial number: 09902309This current transformer set consists of three individual current transfomers identified as:Table 1 identification of transfomersTransformerTypeS/N1BER 42702096439532BER 42702096439543BER 4270309643955positionIn chapter 2, the test procedures and applicable specifications are indicated, while chapter 3gives the test results. Chapter 4 discusses the conclusions. Finally, chapter 5 lists the references.7
NLR-CR-2009-4122 Test procedures and specificationsThe standard test specifications were derived form IEC 60068-2-6, IEC-60068-2-27 and MILSTD-810G.To successfully pass the tests, the equipment shall show no visual damage after the tests. Nosignificant change in electrical behaviour is allowed. The electrical behaviour of the transformerwill be measured (characterized) before and after the vibration and shock tests.The vibration and shock tests are to be applied in the vertical and longitudinal axis only sincethe transformer is almost symmetrical in longitudinal and transversal axes. Refer to figure B 1and B 2 for pictures of the test sample and the definition of its orientations.2.1 Test conditionsAmbient temperature, relative humidity and barometric pressure shall be measured during thetest.2.2 Resonance survey testThe objective of the resonance survey test is to identify the resonance frequencies of the testobject and the characteristic behavior of the test object during these resonances.For the purpose of this test, a flat spectrum is defined: From 5 to 2000 Hz: 0.5 g-PK.The test procedure comprises one sweep upwards, at 1.0 octave/minute sweep rate. Refer tofigure B 3 for a graphical representation of this reference (target) spectrum.2.3 Sine vibration testFrom document IEC 60068-2-6, table B.1 the category ‘General purpose land-based andtransport’ was selected. According document IEC 60068-2-6 the sine vibration referencespectrum of the transformer is defined as: From 10 – 60 Hz: 0.35 mm From 60 – 500 Hz: 5 gThe test procedure comprises ten sweeps up and down (f1 f2 f1) at 1 octaves/minutesweep rate in each of the applicable directions. Ten up and down sweep results in a test time peraxis of approximately 2 hours. Refer to figure B 4 for a graphical representation of thisreference (target) spectrum.8
NLR-CR-2009-4122.4 Random vibration testFrom MIL-STD 810G, Method 514.6, Category 4, Table 514.5-VI was selected to expose thetest object to composite wheeled vehicle vibration. The random vibration test is performed tosimulate the transport of the transformer by a wheeled vehicle over a distance up to 804 km(500 miles).From MIL-STD 810G, the reference spectrum of random vibration test, Category 4, CompositeWheeled Vehicle, Table 514.6C-VII, is defined as:Table 2 Composite wheeled vehicle vibration 2920.00322640.00549
00714280.01575000.0016rms 2.24 grms 1.90 gThis spectrum was imposed on the test sample for 120 minutes in each of the applicabledirections.Refer to figure B 5 (longitudinal) and B 6 (vertical) for a graphical representation of thisreference (target) spectrum.2.5 Shock testFrom document IEC-60068-2-27, table A.1 the category ‘General test for robustness, handlingand transport/ Land-based items permanently installed or only transported by road’ wasselectedThe Shock test is defined as three half sine shocks being applied to the test sample in eachapplicable orthogonal direction, in both the positive and negative senses. This totals to 12shocks per test sample. Each shock has an amplitude of 15 g and a duration of 11 ms.Figure B 7 (negative) and B 8 (positive) gives the reference Shock, applied at the test sample.2.6 Concluding functional testingELEQ Steenwijk B.V. is responsible for the pre and post measurements to characterize the testitem. These measurements will be witnessed by NLR personnel. The difference of thesemeasurements before and after the vibration and shock tests shall be within the normaldistribution to qualify the test object10
NLR-CR-2009-4123 Test resultsThe following sections present the test sequences performed, the corresponding testconfiguration and the figure numbers presenting the results. The abbreviation 'AvC' means theAveraged Control signal, M1 through M3 depicts the measurement signal from the Base of thetransformer. M4 through M6 depicts the measurement signal from the Top of the transformer.Finally M7 and M8 depict the individual channels used for the average control signal.The following table presents the accelerometer definitions:Table 3 Accelerometer 6Sliptable AExtender AEndevco233ENA11Sliptable BExtender BEndevco65HT1011280Base (X,Y,Z)Base (X,Y,Z)Endevco65HT1011279Top (X,Y,Z)Top (X,Y,Z)The table below contains the figure identifications for the applicable vibration tests. The numberin the last columns indicates the number of the figure in appendix B presenting the results of theindicated test sequence.Table 4 Test result figure numbersTEST TS-01transformerX-axisRes. 9303132333435TS-04transformerX-axisOper. S -36-37383940414243Oper. S 44-45464748495051Res. 69TS-05transformerX-axisTS-06transformerZ-axisRes. nsformerZ-axisOper. S Oper. S 105 106 107-100 101 102 103 104-108 109 110 111 112Res. Survey113 114 115 116 117 118 119 120 121Comparison122 123 124 125 126 127 128 129 130The tests were performed in the following order: TS-01 through TS-10.11
NLR-CR-2009-412The tests were executed in the operational state adequately representing the operationalenvironment of the transformer.The test results are contained on the accompanying DVD of this report. The results arepresented as Microsoft Word files in the ‘LMS Vibration data’ Directory. These Word filescontain active pictures which can be accessed by use of a Word plug in. This plug in is also onthe DVD in the directory ‘LMS active picture plug in’. With the use of the plug in cursors canbe set on the signals and data can be copied to Excel.The DVD contains also the raw data collected during the test about the environmental data, thelist of test runs, run logging files and the pictures taken during the test.The name in the table below indicates the name of the figure presenting the results of theindicated test sequence. All filenames have the .doc extension.Table 5 Figure name ‘Base’ sensorFIGURE NAMETEST SEQBASE XBASE YBASE ZTS-01TS-01 (X) Pre RS 2TS-01 (X) Pre RS 3TS-01 (X) Pre RS 4TS-02TS-02 (X) Sine 2TS-02 (X) Sine 3TS-02 (X) Sine 4TS-03TS-03 (X) Random 2TS-03 (X) Random 3TS-03 (X) Random 4(is control)TS-04 (X) OS pos 2TS-04 (X) OS pos 3TS-04(is control)TS-04 (X) OS neg 2TS-04 (X) OS neg 3TS-05TS-05 (X) Post RS 2TS-05 (X) Post RS 3TS-05 (X) Post RS 4TS-06TS-06 (Z) Pre RS 2TS-06 (Z) Pre RS 3TS-06 (Z) Pre RS 4TS-07TS-07 (Z) Sine 2TS-07 (Z) Sine 3TS-07 (Z) Sine 4TS-08TS-08 (Z) Random 2TS-08 (Z) Random 3TS-08 (Z) Random 4TS-09TS-10TS-09 (Z) OS pos 2TS-09 (Z) OS pos 3TS-09 (Z) OS pos 4TS-09 (Z) OS neg 2TS-09 (Z) OS neg 3TS-09 (Z) OS neg 4TS-10 (Z) Post RS 2TS-10 (Z) Post RS 3TS-10 (Z) Post RS 4Table 6 Figure name ‘Top’ sensorFIGURE NAMETEST SEQTOP XTOP YTOP ZTS-01TS-01 (X) Pre RS 5TS-01 (X) Pre RS 6TS-01 (X) Pre RS 7TS-02TS-02 (X) Sine 5TS-02 (X) Sine 6TS-02 (X) Sine 7TS-03TS-03 (X) Random 5TS-03 (X) Random 6TS-03 (X) Random 7TS-04 (X) OS pos 4TS-04 (X) OS pos 5TS-04 (X) OS pos 6TS-04TS-05TS-04 (X) OS neg 4TS-04 (X) OS neg 5TS-04 (X) OS neg 6TS-05 (X) Post RS 5TS-05 (X) Post RS 6TS-05 (X) Post RS 712
NLR-CR-2009-412FIGURE NAMETEST SEQTOP XTOP YTOP ZTS-06TS-06 (Z) Pre RS 5TS-06 (Z) Pre RS 6TS-06 (Z) Pre RS 7TS-07TS-07 (Z) Sine 5TS-07 (Z) Sine 6TS-07 (Z) Sine 7TS-08TS-08 (Z) Random 5TS-08 (Z) Random 6TS-08 (Z) Random 7TS-09TS-10TS-09 (Z) OS pos 5TS-09 (Z) OS pos 6(is control)TS-09 (Z) OS neg 5TS-09 (Z) OS neg 6(is control)TS-10 (Z) Post RS 5TS-10 (Z) Post RS 6TS-10 (Z) Post RS 7Table 7 Figure name ‘Control’ sensorFIGURE NAMETEST SEQAVERAGE CONTROLTS-01TS-01 (X) Pre RS 1TS-02TS-02 (X) Sine 1TS-03TS-03 (X) Random 1TS-04 (X) OS pos 1TS-04TS-04 (X) OS neg 1TS-05TS-05 (X) Post RS 1TS-06TS-06 (Z) Pre RS 1TS-07TS-07 (Z) Sine 1TS-08TS-08 (Z) Random 1TS-09 (Z) OS pos 1TS-09TS-09 (Z) OS neg 1TS-10TS-10 (Z) Post RS 1Comparison of resonance survey tests before and after the qualification tests.Table 8 Comparison of resonance survey results for ‘Base’ sensorFIGURE NAMETEST SEQTS-05TS-10BASE XBASE YBASE ZTS-05 Compare RS TS-01TS-05 Compare RS TS-01TS-05 Compare RS TS-01(X) 2(X) 3(X) 4TS-10 Compare RS TS-06TS-10 Compare RS TS-06TS-10 Compare RS TS-06(Z) 2(Z) 3(Z) 413
NLR-CR-2009-412Table 9 Comparison of resonance survey results for ‘Top’ sensorFIGURE NAMETEST SEQTS-05TS-10TOP XTOP YTOP ZTS-05 Compare RS TS-01TS-05 Compare RS TS-01TS-05 Compare RS TS-01(X) 5(X) 6(X) 7TS-10 Compare RS TS-06TS-10 Compare RS TS-06TS-10 Compare RS TS-06(Z) 5(Z) 6(Z) 73.1 Incoming inspectionNo relevant observations were made during the Visual Incoming Inspection.3.2 Test ConditionsThe temperature and relative humidity was measured during the test period. The following tablepresents the extreme of temperature and relative humidity:Table 10 Extreme of temperature and relative humidityDateTemperatureRelative humidityMinimumMaximumMinimumMaximumth21.7 C25.2 C30 %46 %th22.8 C24.6 C31 %39 %August 5 , 2009August 6 , 200914
NLR-CR-2009-412The following graph presents the measured values of temperature.TemperatureTemperature26.0Temperature 8-200900:00TIME (dd-mm-yyyy HH:MM)Fig. 4 Measured temperature during the test periodThe following graph presents the measured value of the relative humidity.Relative HumidityRelative Humidity80Relative Humidity 6-08-200900:0006-08-200912:00TIME (dd-mm-yyyy HH:MM)Fig. 5 Measured relative humidity during the test period1507-08-200900:00
NLR-CR-2009-412The barometric pressure was measured during the test period. The following table presents theextreme of barometric pressure:Table 11 Extreme of barometric pressureDatePressureMinimumMaximumAugust 5 , 20091026.61028.3August 6th, 20091025.11027.7thThe following graph presents the measured value of the barometric pressure.Air pressureAir pressure1022.51022.0Air pressure 0:0006-08-200912:0007-08-200900:00TIME (dd-mm-yyyy HH:MM)Fig. 6 Measured barometric pressure during the test period3.3 Resonance Survey testThe test sample was successfully subjected to a Resonance Survey in all orientations, bothbefore and after the qualification level tests.Table 12 presents the measured values of the main resonance frequencies.16
NLR-CR-2009-412Table 12 Resonance frequencies1st Resonance -05TS-06TS-1047.15 Hz43.7 Hz76.8 Hz57.8 HzDuring TS-06, the pre resonance survey test in the X-direction, the abort band was increasedbetween 70 and 110 Hz due to the resonance of the test object.No further relevant observations were made during the Resonance Survey tests.3.4 Sine vibrationThe transformer was successfully subjected to the sine vibration test in all applicableorientations.During the TS-07, the sine test in the Z-direction, the test stopped at 52 Hz due to an overload atthe ‘Top Z’ channel. The test was continued in a new run to complete the test for a total of 10up and down sweeps.No further relevant observations were made during the sine vibration tests.3.5 Random vibration testThe transformer was subjected to 120 minutes of random vibration in each of the applicabledirections specified. The actual PSD value was within 5% of the nominal level.During the TS-08 the test stopped a number of times due to an ‘over travel detection’ on theshaker. This is due to the test specification. The test specification compromises a maximumdisplacement of 32.4 mm (o-pk) which exceeds the shaker system capability of 25.4 mm (0-pk).The Gaussian random distribution of the test specification was adapted from 5 σ to 3.9 σ whichresulted in a maximum displacement of 25.3 mm (0-pk). The MIL-STD 810G allows to adaptthe test specification to the shaker system capability. The test was continued in a new run tocomplete the test for a total 120 minutes test time.No further relevant observations were made during the random vibration tests.3.6 Shock testThe test sample was subjected to three 15 g / 11 ms shocks in each of the applicable orthogonaldirections in both the negative and positive senses.17
NLR-CR-2009-412The time base of 11 ms of the shock test resulted in a difficult to control test. A test object witha main resonance frequency of 73 Hz will be maximal excited by a half sine shock with pulseduration of 11 ms. The following relation is applicable:f n 0.8 / Dwhere D is the duration of the half sine pulseThe transformer has a main resonance frequency between 50 and 75 Hz.The Base {X,Y,Z} sensor was used as control sensor. Note that the polarity of the Extender Aand Extender B sensor is reversed due to the mounting position.No further relevant observations were made during the Shock tests.3.7 Concluding functional testingAfter completing all tests, the Current transformer set was tested in its full functionalconfiguration at the ELEQ Steenwijk B.V. premises. According to ELEQ Steenwijk B.V. thetransformer showed full compliance with the applicable performance standards. Appendix Ccontains a summary of the electrical measurement test results. The full test results can be foundin the directory ’10) Characterization measurement data)’ on the accompanying DVD. Nosignificant change was indicated during these measurements. The measured values were withinthe normal expected distribution.The Current transformer set was dismantled and visually inspected. Pictures of the dismantledCurrent transformer set can be found in the directory ’5) Pictures\3) After test inspection’ on theaccompanying DVD. No damage or abnormal wear could be found.18
NLR-CR-2009-4124 ConclusionsThe transformer completed the vibration and shock tests according to IEC 60068-2-6, IEC60068-2-27 and MIL-STD-810G.No significant change in electrical behaviour could be found after the vibration and shock tests.After completing all tests, the Current transformer set was tested in its full functionalconfiguration at the ELEQ Steenwijk B.V. premises. According to ELEQ Steenwijk B.V. thetransformer showed full compliance with the applicable performance standards. The Currenttransformer set was dismantled and visualy inspected. No damage or abnormal wear could befound.The Current Transformer Set is a typical example of a transformer configuration, consisting of aset of three transformers stacked on top of each other. The tests comprised the followingstandards: IEC 68-2-6, IEC-68-2-27, and MIL-STD-810G. The test in accordance with MILSTD-810G re
figure B 3 for a graphical representation of this reference (target) spectrum. 2.3 Sine vibration test From document IEC 60068-2-6, table B.1 the category ‘General purpose land-based and transport’ was selected. According document IEC 60068-2-6 the sine vibration reference spectrum of the transformer is defined as:
These tests range from temperature shock to structural shock. Ironically, one of the most severe tests the accessories are subjected to is live fire on the host weapon. . shaped experimentally using a Vibration Research controller using Vibration View software. Classical shock profiling was used, and the shape of the shock is trapezoidal. The .
Shock and Vibration testing of LCD monitors Materials Three (3) monitors: ML 17" #1, ML 17" #2, ML 19" . The displays provided by Hope Industrial Systems, Inc. were subjected to the shock and vibration tests described in "HIS Monitor Testing, version 0.92, July 2008" for Tests 6, 7, 10 and 11.
shock. The random vibration specification is in the form of a power spectral density (PSD). The shock requirement is a shock response spectrum (SRS). Pyrotechnic-type SRS tests are often more difficult to configure and control, and are thus more expensive than shaker table PSD tests. Furthermore, some lower and even mid-level SRS specifications .
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Shock and Vibration Test report Revision -: October, 26th, 2003 DOCUMENT REFERENCE Project number TYPE FORMAT PAGE D00318Calculation report Lt15 - REV 5 VIBRATION TESTS: Vibration Type In accordance with the MIL STD 167, type I. Test will include, for each axis: - Exploratory test, as detailed in paragraph 5.1.3.3.1 of the MIL STD 167
Shock and Vibration Test report Revision -: October, 26th, 2003 DOCUMENT REFERENCE Project number TYPE FORMAT PAGE D00318 Calculation report Lt 15 - REV 5 VIBRATION TESTS: Vibration Type In accordance with the MIL STD 167, type I. Test will include, for each axis: - Exploratory test, as detailed in paragraph 5.1.3.3.1 of the MIL STD 167
