By Wolfgang Hauschild, Eberhard Lemke
It is the motive of this publication to mix high-voltage (HV) engineering with HV trying out procedure and HV measuring process. in keeping with long term event won by way of the authors as lecturer and researcher in addition to member in overseas firms, corresponding to IEC and CIGRE, the ebook will replicate the cutting-edge in addition to the long run developments in checking out and diagnostics of HV apparatus to make sure a competent iteration, transmission and distribution of electric strength. The ebook is meant not just for specialists but in addition for college kids in electric engineering and high-voltage engineering.
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Extra info for High-Voltage Test and Measuring Techniques
When a diagnostic test is decided according to measurements of a single parameter or a set of parameters (preferably of partial discharges), the test result must be compared with pre-given limits. These limits shall be related by experience or any physical model to the remaining life time. The sharpness of such an indirect test is lower than that of a monitored withstand test. Sometimes, it is published that withstand tests are ‘‘destructive’’ and diagnostic measurements are ‘‘non-destructive’’.
In case of a converting device for outdoor application, the type test should include an artificial rain test. This first performance test shall also include an interference test of the transmission system (coaxial cable) and the instrument of LI/SI measuring systems disconnected from the generator, but in their position for operation. This test generates an interference condition at the short-circuited input of the transmission system by firing the related impulse voltage generator at a test voltage representative for the highest operating voltage of the measuring system.
1) The column gives only the value of the SI voltage component of the relevant combined voltage test. The peak value of the AC component of opposite polarity is (VmÁH2/H3) b This is the peak value of the combined voltage in the relevant combined SI/AC voltage test c These values apply to both, phase-to-earth and phase-to-phase insulation. 4 Simplified example for the selection of withstand test voltages Highest voltage for equipment Vm AC test SI test LI test LIC test (transformers only) 850 kV 1050 kV 1175 kV External insulation (atmospheric air) 1175 kV 1300 kV Internal insulation (SF6, oil, solids) 1175 kV 1300 kV External insulation 1300 kV 1425 kV Internal insulation 1300 kV 1425 kV External insulation 1425 kV 1570 kV Internal insulation (630kV) 950 kV Application to insulation 420 kV (680 kV) 1050 kV (680 kV) Note Consider that most test voltages are applied between phase and ground.