HV generators. a For AC test voltage 1,000 kV at Cottbus Technincal University. b For DC test voltage 1,500 kV Cologne. c For LI/SI test 2,400 kV at Dresden Technical University
Measuring systems a Voltage measuring system with digital recolrder including impluse generator. b Compact capacitance/loss factor measuring system with integrated AC voltage source(Courtesy of Double-Lemke). c Partial discharge measuring system including AC voltage test circuit(Courtesy of Double-Lemke)
This section is realted to voltage measurement and describes HV measuring systems, their calibration and the estimation of their uncertainties of measurements. Precise measurement of high test Voltage is considered to be a difficult tast for many years(Jouaire and Sabot et al. 1978; "Les Renardieres Group" 1974). This situation is also reflected by the olderneditions of the relevant standard IEC 60060-2. For good practice in HV test fields, this Sect. 2.3 on HV measurement and uncertainty estimation is closely related to the newest edition of the standard IEC 60060-2:2010.
The terms "uncertainty","error" and "tolerance" are often mixed up. therefore, the following clarification seems needed: The uncertainty is a parameter which ia associated with the result of a measurement. It characterizes the dispersion of the measured quantity minus a reference value for this quantity and the tolerance is the permitted difference between the measured and the specified value. Tolerance is the permitted difference between the measured and the specified value. Tolerance play a role for standard HV test procedures(sects. 3.6,6.5 and 7.6). Uncertainties are import for the decision, whether a measuring system is applicable or not for acceptance testing.