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Components used in the power grid need to be tested to verify they can withstand specified voltage stresses. Composite voltage test according to IEC 60060-1:2010 is a test method where impulse voltage is applied simultaneously with AC or DC voltage to the same terminal of the test object. To provide traceability to instruments used for composite voltage measurements, low-voltage calibrator based on combining existing calibrators was developed. The developed composite voltage calibrator can generate lightning and switching impulses together with DC and AC. The calibrator design is based on a series connection of a DC/AC calibrator and a calculable impulse voltage calibrator. Maximum impulse voltage peak is 330 V whereas the DC/AC voltage can be within 1000 V. Reference parameters for composite waveshape are calculated based on the applied voltage, charging voltage of the impulse calibrator, internal impedance of the impulse calibrator, and the input impedance of the device under calibration. The main uncertainty components of this composite voltage calibrator are the uncertainties related to the separate calibrators and the uncertainty of the load impedance needed for the parameter calculation.
|Title of host publication
|Proceedings of the 27th Nordic Insulation Symposium
|Nordic Insulation Symposium
|Number of pages
|Published - 5 Jul 2022
|MoE publication type
|A4 Article in a conference publication
|27th Nordic Insulation Symposium - Trondheim, Norway
Duration: 13 Jun 2022 → 15 Jun 2022
|Proceedings of the Nordic Insulation Symposium
|27th Nordic Insulation Symposium
|13/06/22 → 15/06/22
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