This Part of GB/T 16927 specifies
This Part is applicable to tests on equipment having its highest voltage for equipment Um above 1 kV:
a) Dielectric tests with direct voltage;
b) Dielectric tests with alternating voltage;
c) Dielectric tests with impulse voltage;
d) Dielectric tests with combinations of the above.
Note 1: For on-site testing, see GB/T 16927.3.
Note 2: Alternative test procedures may be required to obtain reproducible and significant results. The choice of a suitable test procedure should be made by the relevant technical committee.
Note 3: For voltages Um above 800 kV meeting some specified procedures, tolerances and uncertainties may not be achievable.
Foreword III
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
4.1 General requirements for test procedures
4.2 Arrangement of the test object in dry tests
4.3 Atmospheric corrections in dry tests
4.4 Wet tests
5 Tests with Direct Voltage
5.1 Definitions for direct voltage tests
5.2 Test voltage
5.3 Test procedures
6 Tests with Alternating Voltage
6.1 Definitions for alternating voltage tests
6.2 Test Voltage
6.3 Test procedures
7 Tests with Lightning-impulse Voltage
7.1 Definitions for lightning-impulse voltage tests
7.2 Test voltage
7.3 Test procedures
8 Tests with Switching-impulse Voltage
8.1 Definitions for switching-impulse voltage tests
8.2 Test voltage
8.3 Test procedures
9 Tests with Combined and Composite Voltages
9.1 Definitions for combined- and composite-voltage tests
9.2 Combined test voltages
9.3 Composite test voltages
9.4 Test procedures
Appendix A (Informative) Statistical Treatment of Test Results
A.1 Classification of tests
A.2 Statistical behaviour of disruptive discharge
A.3 Analysis of test results
A.4 Application of maximum likelihood methods
Appendix B (Normative) Procedures for Calculation of Parameters of Standard Lightning-impulse Voltages with Superimposed Overshoot or Oscillations
B.1 Basis of the procedures
B.2 Procedure for evaluation of parameters of full lightning impulses
B.3 Procedure for manual calculation from graphical waveforms
B.4 Procedure for evaluation of parameters of tail chopped lightning impulses
B.5 Example of calculation
Appendix C (Informative) Guidance for implementing Software for Evaluation of Lightning-impulse Voltage Parameters
C.1 Guidance for implementing base curve fitting
C.2 An example of a digital filter for implementation of the test voltage function
Appendix D (Informative) Background to the Introduction of the Test Voltage Factor for Evaluation of Impulses with Overshoot
D.1 Previous version (GB/T 16927.1-1997)
D.2 Research and development to provide a solution
D.3 Limit on overshoot
D.4 Impulses outside the limit
Appendix E (Informative) The Iterative Calculation Method in the Converse Procedure for the Determination of Atmospheric Correction Factor
E.1 Introductory remark
E.2 Change of atmospheric pressure with altitude
E.3 Sensitivity of Kt to U50
E.4 Calculation with the iterative calculation procedure
E.5 Comment
Bibliography
