Abstract
In the framework of the European Project 19NRM07 HV-com2 supporting the standardization in high-voltage testing with composite and combined wave shapes, a divider to employ in a test set-up for validation of electrical devices submitted to composite voltages below 1 kV has been developed at the Istituto Nazionale di Ricerca Metrologica (INRIM) and currently is under extensive testing. After a simulation stage, an available divider has been modified to comply with the IEC 60,060 requirements in terms of step response and scale factor. To be suitably fast in replying to step voltages, an adjustment of the components of the low-voltage arm has been made. The divider has been calibrated with traceability to the relevant INRIM National Standards and characterized exploiting its scale factor at different voltages and frequencies. The divider has been then inserted in a set-up with a sinusoidal generator, an impulse generator and coupling–blocking elements to carry out tests at low voltages (below 1 kV) with single voltages. In these tests, the divider showed a satisfactory attitude as converting device and its scale factor is traceable with suitable uncertainty.
Highlights
The Istituto Nazionale di Ricerca Metrologica (INRIM) dividerVoltage dividers have played and still play a strategic role in metrology for low and high DC [5,6,7,8,9,10,11,12,13,14], AC [15,16,17,18] and impulse voltages [19,20,21] At INRIM, a test set-up involving a divider with a sinusoidal and a LI generators has been simulated with the LT-spice program
1 Introduction, state of the art Recently, the increase in electricity generation from renewable sources has changed the management of the high-voltage grid with the need to verify that the devices connected to the network are suitable for this change
There is a lack in the relevant normative as it considers measurement systems and voltage dividers of test laboratories suitable for composite and combined voltages by calibrating them vs. these voltages separately
Summary
Voltage dividers have played and still play a strategic role in metrology for low and high DC [5,6,7,8,9,10,11,12,13,14], AC [15,16,17,18] and impulse voltages [19,20,21] At INRIM, a test set-up involving a divider with a sinusoidal and a LI generators has been simulated with the LT-spice program. Simulations with single generators (LI and sinusoidal) and with composite voltages have been carried out. After this stage, a resistive–capacitive divider (compensated voltage divider), available at the INRIM High Voltage and High Power Laboratory (LATFC), has been selected to be modified to comply with the requirements of [2] in terms of step response and scale factor and to employ it in a test set-up with composite voltages.
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