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2019, vol. 74, br. 1, str. 97-102
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Doprinos racionalizaciji merenja impedanse sistema uzemljenja srednjenaponskih transformatorskih stanica
A contribution to the rationalization of grounding impedance measurement in medium voltage substations
Univerzitet u Beogradu, Elektrotehnički institut 'Nikola Tesla', Srbija
e-adresa: vojin@ieent.org
Projekat: Povećanje energetske efikasnosti HE i TE EPS-a razvojem tehnologije i uređaja energetske elektronike za regulaciju i automatizaciju (MPNTR - 33020)
Sažetak
Za potrebe merenja impedanse sistema uzemljenja transformatorske stanice (TS) neophodno je pomoćno uzemljenje. U tu svhu, konvencionalni metod merenja FOP-TCRM i ekvivalentni FOP-FSM koristi uzemljivač susedne TS. U ovom radu predložen je modifikovani FOP-FSM koji koristi svrdlasti uzemljivač kao pomoćno uzemljenje. Predloženi metod je praktičan i ekonomičan. Praktičan je u manipulativnom pogledu, a ekonomičan je jer ne zahteva, da se za potrebe merenja, privremeno angažuje dalekovod koji spaja ispitivano uzemljenje i pomoćno uzemljenje u susednoj TS. Eksperimentalna provera predloženog metoda merenja izvršena je u pet distributivnih TS 35/10 kV. Merenja su vršena simultano, tj. koristeći novi i konvencionalni metod. Rezultati dobijeni na oba načina praktično su istovetni.
Abstract
In this paper, a method for grounding impedance measurement is proposed. The method is experimentally validated in five substations rated voltage 35/10 kV. Compared to a standard measuring method, the basic benefits of the proposed method are: (a) the current probe is realised in the form of a ground drill (a drill-type electrode designed to be driven into the earth) instead of being used the grounding grid of a next substation, (b) proposed method does not use an overhead line (or a cable line) for purposes to connect remote current probe, (c) the proposed method requires a test signal source whose output power may be in the order 100 W (instead of 1 kW in standard method), and (d) measuring accuracy of the proposed method is the same as in the case when standard method is used.
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Reference
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*** (2010) EN 50522: Earthing of power installations exceeding 1 kV a.c. CENELEC European Committee for Electrotechnical Standardization, Nov
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*** (2012) IEEE guide for measuring earth resistivity, ground impedance, and earth surface potentials of a ground system: IEEE Standard 81-2012. Dec
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Kostić, V., Raičević, N., Mrvić, J., Rebrić, S. (2015) Grounding System Impedance Measurement - Case Study. O5-6 (CD), pp. 1-4
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Kostić, V.I. (2016) Poboljšani metodi za merenje sigurnosnih karakteristika sistema uzemljenja u visoko-naponskim postrojenjima. Univerzitet u Nišu - Elektronski fakultet, doktorska disertacija
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Kostić, V., Raičević, N., Kovačević, D. (2016) The choice of suitable frequencies for measurements based on FSM. Facta universitatis - series: Automatic Control and Robotics, vol. 15, br. 1, str. 9-16
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