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eLibrary > BS EN 61788-8:2010 Superconductivity - AC loss measurements. Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method >

BS EN 61788-8:2010 Superconductivity - AC loss measurements. Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method, 2010

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BS EN 61788-8:2010 Superconductivity - AC loss measurements. Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method, 2010

iec61788-8{ed2.0}en.pdf [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus [Go to Page]
5.1 Testing apparatus
5.2 Pickup coils
5.3 Compensation circuit
6 Specimen preparation [Go to Page]
6.1 Coiled specimen
6.2 Specimen coil form
7 Testing conditions [Go to Page]
7.1 External applied magnetic field
7.2 Setting of the specimen
7.3 Measurement temperature
7.4 Test procedure
8 Calculation of results [Go to Page]
8.1 Amplitude of applied magnetic field
8.2 Magnetization
8.3 Magnetization curve
8.4 AC loss
8.5 Hysteresis loss
8.6 Coupling loss and coupling time constant [5,6]
9 Uncertainty [Go to Page]
9.1 General
9.2 Uncertainty of measurement apparatus
9.3 Uncertainty of applied field
9.4 Uncertainty of measurement temperature
10 Test report [Go to Page]
10.1 Identification of specimen
10.2 Configuration of coiled specimen
10.3 Testing conditions
10.4 Results
10.5 Measurement apparatus
Annex A (informative) Additional information relating to Clauses 1 to 10
Annex B (informative) Explanation of AC loss measurement with Poynting’s vector [10]
Annex C (informative) Estimation of geometrical error in the pickup coil method
Annex D (informative) Recommended method for calibration of magnetization and AC loss
Annex E (informative) Coupling loss for various types of applied magnetic field
Annex F (informative) Uncertainty considerations
Annex G (informative) Evaluation of uncertainty in AC loss measurement by pickup coil method [13]
Bibliography
Figures [Go to Page]
Figure 1 – Standard arrangement of the specimen and pickup coils
Figure 2 – A typical electrical circuit for AC loss measurement by pickup coils
Figure C.1 – Examples of calculated contour line map of the coefficient G
Figure D.1 – Evaluation of critical field from magnetization curves
Figure E.1 – Waveforms of applied magnetic field with a period T = 1/f
Tables [Go to Page]
Table F.1 – Output signals from two nominally identical extensometers
Table F.2 – Mean values of two output signals
Table F.3 – Experimental standard deviations of two output signals
Table F.4 – Standard uncertainties of two output signals
Table F.5 – Coefficient of variations of two output signals
Table G.1 – Propagation of relative uncertainty in the pickup coil method (α = 0,5) [Go to Page]

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BS EN 61788-8:2010 Superconductivity - AC loss measurements. Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method, 2010

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