IEC 60060-2 PDF
The text of the International Standard IEC was approved by ISO/ IEC Guide Uncertainty of measurement -. Find the most up-to-date version of IEC at Engineering also reflected by the older editions of the relevant standard IEC For good practice in HV test fields, this Sect. on HV measurement and uncertainty .
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It is recommended that the performance test should be repeated annually, but the maximum interval shall not be longer than five years. The scale factor of the measuring system is established by any suitable method.
NOTE 2 Double-counting of uncertainty contributions may occur when a digital idc is used for repetitive impulse measurements, e. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
The evaluation delivers a standard uncertainty contribution, which is a 06060-2 B estimate: Part 1 Requirements for instruments IS 1 Part 2: In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. For a new or repaired measuring system, performance checks shall be made at short intervals to demonstrate its stability.
This 6000-2 factor may also be determined as the product of the scale 600602 of the components. Therefore, the calculated error of the peak amplitude is often significant in comparison with the numerical error of the convolution calculation, although it may be small in comparison with the required measurement uncertainty of the peak amplitude. This standard also defines the terms used, methods to estimate kec uncertainties of high-voltage measurements, states the requirements which the measuring systems shall meet, describes the methods for approving a measuring system and checking its components and describes the procedures by which the user shall show that a measuring system meets the requirements of this standard, including the limits set for the uncertainty of measurement.
It is used for computer-aided calculation using digital impulse waveforms. Then performance tests and checks made in accordance with earlier versions of this standard are deemed adequate provided they show the scale factor is stable. For exceptions see 60060–2. The record of performance shall comprise at least the following information: NOTE 1 In order to reproduce, in the recorded curve, oscillations that may be superimposed on an impulse, the relevant upper limit frequency may be several MHz.
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The errors and their scatter for different wave-shapes, can be used as an uncertainty contribution to the combined uncertainty of measurement of the parameter concerned. The numerical value of j shall be rounded to the least significant figure that could be affected by the expanded uncertainty. Other contributions can be important in some cases and shall be considered in addition. However, this estimation may be given for defined range of measuring conditions in conjunction with the calibration certificate.
The uncertainty of the divider comprises ied contributions of the iev test up to 1,2 IVIV, the dynamic behaviour and short-term stability. Any temperature corrections to be used should be listed in the record of performance. In addition the step response of the measuring system shall be measured according to Annex C.
Types of electrical measuring instruments – Part Definitions and requirements for on- site testing lEC The result of the test is the change of scale factor from which the standard uncertainty contribution of type B is estimated: The principles of this standard apply also to higher levels but the uncertainty may be greater.
This can be done by evaluation of a set of test data with established reference values.
In contrast to measurements of lightning impulse voltage see 8. Taking correlation into account is thus mainly essential for sophisticated uncertainty analysis to achieve a very accurate estimation of uncertainty.
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The proximity effect need not be investigated as the divider is located outside the minimum clearance specified by the manufacturer. To obtain the uncertainty of measurement of the approved measuring system those of the components should be combined as demonstrated in Annex B. The model equation can be evaluated manually, using the equations given in Annex A, or with the aid of special software which should be validated for calculating uncertainties.
Slight smoothing of the recorded data of the step response is recommended to reduce the influence of small oscillations and noise superimposed on the step response. However, if the digital recorder is then used during an impulse voltage test to obtain a single measurement value, the limited resolution needs to be considered in a Type B uncertainty. The following methods of chopping have been found acceptable: Our prices are in Swiss francs CHF.
Wet tests and pollution tests, when specified, are performed as type tests. The convolution method assumes that the step response of the measuring system is correctly measured and the input waveform used in the calculation is representative of the real impulse waveforms to be measured.
However, many systems which could be approved for measurements of peak value and time parameters cannot be approved for measurements of oscillations. NOTE 2 The period of voltage application should not be longer than the assigned operating time, but can be limited to a time sufficient to reach equilibrium.
Comparative measurement The satisfactory performance of a reference measuring system shall be shown by calibration by comparison measurements at the relevant test voltage against a low-uncertainty reference measuring system, which is itself traceable to the standards of a National IVIetrological Institute.