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A wideband voltage divider for medium voltage measurements
Nongogo, I. S. 2025. A wideband voltage divider for medium voltage measurements. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/0a4b4e4c-4260-4777-9c38-3d46e62eda47
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2025
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| _version_ | 1867613742612611072 |
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| access_status_str | Open Access |
| author | Nongogo, Innocent Sinethemba |
| author2 | Strauss, J. M. |
| author_browse | Nongogo, Innocent Sinethemba Strauss, J. M. |
| author_facet | Strauss, J. M. Nongogo, Innocent Sinethemba |
| author_sort | Nongogo, Innocent Sinethemba |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Nongogo, I. S. 2025. A wideband voltage divider for medium voltage measurements. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/0a4b4e4c-4260-4777-9c38-3d46e62eda47 |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/132263 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:58.715Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/132263 A wideband voltage divider for medium voltage measurements Nongogo, Innocent Sinethemba Strauss, J. M. Stellenbosch University. Faculty of Engineering. Dept. of Electrical & Electronic Engineering. Voltage dividers Electric measurements Magnetostatics Simulation methods UCTD Nongogo, I. S. 2025. A wideband voltage divider for medium voltage measurements. Unpublished masters thesis. Stellenbosch: Stellenbosch University [online]. Available: https://scholar.sun.ac.za/items/0a4b4e4c-4260-4777-9c38-3d46e62eda47 Thesis (MEng)--Stellenbosch University, 2025. ENGLISH ABSTRACT: A wideband voltage divider for medium voltages is an electrical instrument or device that measures voltage signals across a certain frequency band. The performance standard of a wideband voltage divider depends on the frequency band across which a device can measure. Wideband voltage dividers for medium voltages are scarce and very expensive. This study was therefore undertaken to produce an optimised, cost-effective, but good-quality alternative. A comprehensive investigation was undertaken for the chosen topology, a stacked divider formed by round PCBs with high resistance resistors. Round PCBs were used to reduce series inductance, while large holes was introduced to minimize capacitive coupling between PCBs. This resulted in a washer type disc shape. These measures were taken to ensure a wide measurement frequency band. The topology also offers physical strength, contributing to its reliability. The topology was investigated using numerical design, electromagnetic simulation using finite element analysis, and circuit analysis. The size of the structure, electrical parameters, components grading, and components’ number and size were all determined using numerical design. The numerical design was performed using an Excel spreadsheet calculator for electrical calculations. Based on the results of numerical design, simulations were performed through various stages of the research project. The simulations were set up as three-stage simulations, starting with magnetostatic simulation and electrostatic simulation of the topology to obtain inductances and capacitances, as well as frequency response simulation using circuit analysis software. Therefore, the inductance obtained from the magnetostatic simulation and capacitance from the electrostatic simulation are input data to the frequency response simulation with the designed resistance. The accuracy of the simulation method was experimentally verified based on measurements on a six-disc version. A final 34-disc version was then investigated to evaluate its suitability as a wideband voltage divider for medium voltages. A frequency band up to 250 kHz was achieved, which is suitable for measuring higher-frequency harmonics originating from utility-scale renewable power plant inverters. AFRIKAANSE OPSOMMING: ’n Wyebandspanningsverdeler vir mediumspannings is ’n elektriese instrument of toestel wat spanningseine oor ’n sekere frekwensieband meet. Die werkverrigtingstandaard van ’n wyebandspanningsverdeler hang af van die frekwensieband waaroor ’n toestel kan meet. Wyebandspanningsverdelers vir mediumspannings is skaars en baie duur. Hierdie studie is dus onderneem om ’n geoptimaliseerde, koste-effektiewe, maar goeie gehalte alternatief daar te stel. ’n Omvattende ondersoek is onderneem vir die gekose topologie, ’n gestapelde verdeler wat gevorm word deur ronde PCB’s met ho¨e weerstand weerstande. Ronde PCB’s is gebruik om serie-induktansie te verminder, terwyl groot gate ingebring is om kapasitiewe koppeling tussen PCB’s te minimaliseer. Dit het gelei tot ’n wasser tipe skyfvorm. Hierdie maatre¨ els is getref om ’n wye meetfrekwensieband te verseker. Die topologie bied ook fisiese krag, wat bydra tot die betroubaarheid daarvan. Die topologie is ondersoek deur gebruik te maak van numeriese ontwerp, elektromagnetiese simulasie deur gebruik te maak van eindige element analise, en stroombaananalise. Die grootte van die struktuur, elektriese parameters, komponentgradering, en hoeveelheid en grootte van komponente is alles bepaal deur gebruik te maak van numeriese ontwerp. Die numeriese ontwerp is uitgevoer met behulp van ’n Excel-sigbladrekenaar vir elektriese berekeninge. Gebaseer op die resultate van numeriese ontwerp, is simulasies uitgevoer deur verskeie stadiums van die navorsingsprojek. Die simulasies is opgestel as drie-stadium simulasies, wat begin met magnetostatiese simulasie en elektrostatiese simulasie van die topologie om induktansies en kapasitansies te verkry, gevolg deur frekwensierespons simulasie deur gebruik te maak van stroombaananalise sagteware. Daarom dien die induktansie verkry uit die magnetostatiese simulasie en kapasitansie van die elektrostatiese simulasie as insetdata vir die frekwensierespons simulasie met die ontwerpte weerstand. Die akkuraatheid van die simulasiemetode is eksperimenteel geverifieer gebaseer op metings op ’n sesskyf weergawe. ’n Finale 34-skyf weergawe is toe ondersoek om die geskiktheid daarvan as ’n wyeband spanningsverdeler vir mediumspanning te evalueer. ’n Frekwensieband tot 250 kHz is bereik, wat geskik is vir die meet van ho¨ erfrekwensie-harmoniekewat afkomstig is van groot hernubare kragsentrale-wisselrigters. Masters 2025-06-02T07:36:32Z 2025-06-02T07:36:32Z 2025-03 Thesis https://scholar.sun.ac.za/handle/10019.1/132263 en Stellenbosch University 154 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Voltage dividers Electric measurements Magnetostatics Simulation methods UCTD Nongogo, Innocent Sinethemba A wideband voltage divider for medium voltage measurements |
| title | A wideband voltage divider for medium voltage measurements |
| title_full | A wideband voltage divider for medium voltage measurements |
| title_fullStr | A wideband voltage divider for medium voltage measurements |
| title_full_unstemmed | A wideband voltage divider for medium voltage measurements |
| title_short | A wideband voltage divider for medium voltage measurements |
| title_sort | wideband voltage divider for medium voltage measurements |
| topic | Voltage dividers Electric measurements Magnetostatics Simulation methods UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/132263 |
| work_keys_str_mv | AT nongogoinnocentsinethemba awidebandvoltagedividerformediumvoltagemeasurements AT nongogoinnocentsinethemba widebandvoltagedividerformediumvoltagemeasurements |