GOST 12119.0-98

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  ГОСТ 12119.0-98

GOST 12119.0−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. General requirements

GOST 12119.0−98

Group B39

INTERSTATE STANDARD

Electrotechnical steel

METHODS FOR DETERMINING MAGNETIC AND ELECTRICAL PROPERTIES

General requirements

Electrical steel. Methods of test for magnetic and electrical properties.
General requirements

ISS 77.040.20
AXTU 0909

Date of introduction 1999−07−01

Preface

1 DEVELOPED by the Russian Federation, the Interstate technical Committee for standardization MTK 120 «steel Products from ferrous metals and alloys"

INTRODUCED by Gosstandart of Russia

2 ADOPTED by the Interstate Council for standardization, Metrology and certification (minutes N 13 dated 28 may 1998)

The adoption voted:

3 Resolution of the State Committee of the Russian Federation for standardization and Metrology dated December 8, 1998 N 437 inter-state standard GOST 12119.0−98 introduced directly as state standard of the Russian Federation from July 1, 1999

4 REPLACE GOST 12119−80 in section 1

5 REISSUE

1 Scope

This standard establishes General requirements for methods of measurement of magnetic and electrical quantities characterizing the properties of electrical steel.

2 Normative references

The present standard features references to the following standards:

GOST 12119.1−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Methods of measurement of magnetic induction and the coercive force in the office of the Epstein and ring samples in a constant magnetic field

GOST 12119.2−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Measurement method of magnetic induction in Permeameter

GOST 12119.3−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measuring coercive force in open magnetic circuit

GOST 12119.4−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measurement of specific magnetic losses and actual value of magnetic field intensity

GOST 12119.5−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measurement of magnetic induction amplitudes and magnetic field

GOST 12119.6−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. A method of measuring the relative magnetic permeability and specific magnetic losses by a bridge AC

GOST 12119.7−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. A method of measuring the electrical resistivity of the bridge DC

GOST 12119.8−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measurement of resistance ratio of insulating coating

3 General provisions

3.1 Accuracy of measurement of magnetic and electrical quantities correspond to the confidence probability = 0,95.

For each method the measurement error of the magnetic and electrical quantities, evaluate the results of the verification or certification of installations using standard samples.

3.2 Conditions for measurement the following:

ambient temperature, °C 18 to 28

humidity, % 30−80

pressure 75−105 kPa

Vibration and shaking are not allowed. External magnetic fields should not affect the measurement results.

3.3 Samples for testing should not have mechanical damage, jagged edges, visible burrs.

3.4 Measurement of physical quantities should be performed at least three times and calculate average arithmetic value.

3.5 the List of measuring instruments used in the measurement of magnetic and electrical properties of electrical steels is given in Appendix A.

Allowed the use of other measuring instruments metrological characteristics are not worse than specified in the 12119.1 GOST-GOST 12119.8.

4 Definition

In this standard use the following terms with respective definitions:

The basic magnetization curve — a curve representing the locus of the vertex of the symmetric magnetic hysteresis loops, which are obtained by sequentially increasing maximum values of the magnetic field.

The maximum magnetic hysteresis loop symmetrical magnetic hysteresis loop, the maximum value of magnetization which corresponds to the magnetization of technical saturation.

Magnetic losses — power absorbed by the sample magnetic material and dissipated as heat when exposed to the material changing in time magnetic field.

Specific magnetic losses magnetic losses per unit mass of magnetic material.

The effective sample length is the length of the uniformly magnetized sample, which has the same test sample density, cross-sectional area, the magnetic losses and specific magnetic losses at the same frequency reversal of polarity, the amplitude of the magnetic induction, the shape factor of the curve the rate of change of magnetic flux and temperature.

The effective mass is the product of the effective length of the specimen to the area of its cross section and density of the material.

The average length of the magnetic lines of force of the sample is the length of the uniformly magnetized sample of the same magnetic material as the test sample, magnetized the same with the latest magnetic field with the same values of magnetic induction, and magnetomotive force and other factors that determine test conditions.

Basic reduced error is the error of a measuring instrument used under normal conditions, a normalized value.

The coefficient of non-sinusoidal voltage is the ratio of the square root of the sum of the squares of the harmonics to the effective value of the voltage.

The ratio of the stress curve — the ratio of the RMS voltage to srednetemperaturnogo voltage.

The amplitude shape factor of the curve — the ratio of the amplitude value of the voltage to the current value.

Coefficient of resistance insulation coating — resistance of the insulating layer covering the surface of the electrical steel area of 1 cm.

Annex a (informative). The list of measuring means

APPENDIX A
(reference)

Table A. 1

The text of the document is verified by:
the official publication of the
Electrotechnical steel.
Specifications.
Methods of analysis: Sat. Standards. -
M.: IPK Publishing house of standards, 2003