ASTM A697-98
(Test Method)Standard Test Method for Alternating Current Magnetic Properties of Laminated Core Specimen Using Voltmeter-Ammeter-Wattmeter Methods
Standard Test Method for Alternating Current Magnetic Properties of Laminated Core Specimen Using Voltmeter-Ammeter-Wattmeter Methods
SCOPE
1.1 This test method covers the determination of several ac magnetic properties of laminated cores made from flat-rolled magnetic materials.
1.2 This test method covers test equipment and procedures for the determination of impedance permeability and exciting power, from voltage and current measurements, and core loss from wattmeter measurements. These tests are made under conditions of sinusoidal flux.
1.3 This test method covers tests for two general categories (1 and 2) of cores based on size and application.
1.4 Tests are provided for power and control size cores (Category 1) operating at inductions of 10 to 15 kG [1.0 to
1.5 T] and at frequencies of 50, 60, and 400 Hz.
1.5 Procedures and tests are provided for coupling and matching type transformer cores (Category 2) over the range of inductions from 100 G [0.01 T] or lower to 10 kG [1.0 T] and above at 50 to 60 Hz or above when covered by suitable procurement specifications.
1.6 This test method also covers tests for core loss and ac impedance permeability under incremental test conditions (ac magnetization superimposed on dc magnetization) for the above core types and at inductions up to those that cause the ac exciting current to become excessively distorted or to reach values that exceed the limits of the individual test-equipment components.
1.7 This test method shall be used in conjunction with Practice A34 and Terminology A340. It depends upon these designated documents and a related reference test manual for detailed information which will not be repeated in this test method.
1.8 The preferred units in this standard are (cgs-emu and inch-pound) units. Values in SI units are indicated in brackets or conversion factors are provided. Derivations of separate equations for SI units are provided as necessary.
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:A 697–98
Standard Test Method for
Alternating Current Magnetic Properties of Laminated Core
1
Specimen Using Voltmeter-Ammeter-Wattmeter Methods
This standard is issued under the fixed designation A 697; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.
1. Scope 1.9 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers the determination of several ac
responsibility of the user of this standard to establish appro-
magnetic properties of laminated cores made from flat-rolled
priate safety and health practices and determine the applica-
magnetic materials.
bility of regulatory limitations prior to use.
1.2 This test method covers test equipment and procedures
for the determination of impedance permeability and exciting
2. Referenced Documents
power from voltage and current measurements, and core loss
2.1 ASTM Standards:
from wattmeter measurements. These tests are made under
A 34/A 34M Practice for Sampling and Procurement Test-
conditions of sinusoidal flux.
2
ing of Magnetic Materials
1.3 This test method covers tests for two general categories
A 340 Terminology of Symbols and Definitions Relating to
(1 and 2) of cores based on size and application.
2
Magnetic Testing
1.4 Tests are provided for power and control size cores
(Category 1) operating at inductions of 10 to 15 kG [1.0 to 1.5
3. Terminology
T] and at frequencies of 50, 60, and 400 Hz.
3.1 The terms and symbols listed below apply only to this
1.5 Procedures and tests are provided for coupling and
test method. The official list of symbols and definitions may be
matchingtypetransformercores(Category2)overtherangeof
found in Terminology A 340.
inductions from 100 G [0.01 T] or lower to 10 kG [1.0 T] and
3.2 Symbols:Symbols:
above at 50 to 60 Hz or above when covered by suitable
A = E lamination surface area, one side only,
s
procurement specifications.
A = EI lamination surface area, one side only,
ss
1.6 This test method also covers tests for core loss and ac
h = lamination stack height,
impedance permeability under incremental test conditions (ac A = dc ammeter,
dc
I = dc current,
dc
magnetization superimposed on dc magnetization) for the
N = primary turns,
1
above core types and at inductions up to those that cause the ac
N = secondary turns,
2
N = tertiary turns,
exciting current to become excessively distorted or reach
3
R = ammeter shunt resistance,
1
values that exceed the limits of the individual test equipment
V = flux voltmeter,
f
components.
w = lamination center leg width,
1.7 This test method shall be used in conjunction with W = wattmeter, and
Z = choke coil impedance.
PracticeA 34/A 34M and TerminologyA 340. It depends upon
thesedesignateddocumentsandarelatedreferencetestmanual
4. Summary of Test Method
for detailed information which will not be repeated in this test
4.1 For Category 1 cores, the recommended tests are made
method.
at a frequency of 60 Hz and at a test induction within the range
1.8 The preferred units in this standard are cgs-emu and
from 10 through 15 kG [1.0 to 1.5 T].
inch-pound units.Values in SI units are indicated in brackets or
4.2 For Category 2 cores, the recommended tests are made
conversion factors are provided. Derivations of separate equa-
at a frequency of 50 or 60 Hz and at inductions of 40, 100 or
tions for SI units are provided as necessary.
200, 2000, 5000, 6000, 7000, and 10 000 G [0.004, 0.01 or
0.02, 0.2, 0.5, 0.6, 0.7, and 1.0 T]. Any or all may be required
1
depending on the type of core material.
This test method is under the jurisdiction of Committee A-6 on Magnetic
Properties and is the directresponsibilityofSubcommitteeA06.01onTestMethods.
Current edition approved Oct. 10, 1998. Published February 1999. Originally
ε1 2
published as A 697 – 74. Last previous edition A 697 – 91 (1996) . Annual Book of ASTM Standards, Vol 03.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A697–98
5. Significance and Use the tertiary winding N is designed so that the
3
N 5 5 2 π l (and N /N = 20).
√
3 1 1 3
5.1 This test method was developed for evaluating the ac
6.2.3 The coils listed in Table 3 have been designed for
magnetic properties of laminated cores made from flat-rolled
testing Category 1 cores at a frequency of 400 Hz.
magnetic materials.
5.2 The reproducibility and repeatability of this test method 6.3 Flux Voltmeter—The flux voltmeter shall be a true
are such that this test met
...
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