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DOI: https://doi.org/10.15407/techned2018.01.078


INVESTIGATION OF EMERGENCY MODES OF CASCADE CURRENT TRANSFORMERS AFTER DISCONNECTION THEIR SECONDARY CIRCUITS

Journal Tekhnichna elektrodynamika
Publisher Institute of Electrodynamics National Academy of Science of Ukraine
ISSN 1607-7970 (print), 2218-1903 (online)
Issue No 1, 2018 (January/February)
Pages 78 – 86

 

Authors
A.V. Zhurakhivskyi, Yu.A. Kens, O.M. Ravlyk, R.Ya. Ferensovych
Lviv Polytechnic National University,
S. Bandery street, 12, Lviv, 79013, Ukraine,
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Abstract

The article presents a calculation scheme of a two-stage cascade current transformer for a computer simulation its operation modes after disconnection under load secondary circuits, which was created by the authors. The analysis of the results of computer calculation steady-state and transient modes of investigated cascade current transformer type TOM-765 after opening its secondary windings considering active power losses in the magnetic cores of stages is carried out. The obtained calculation oscillograms describe the character of the processes in the respective stages of the cascade current transformer for the mode of open its secondary circuits. References 13, figures 5, tables 2.

 

Key words: two-stage cascade current transformer, calculation scheme, the upper and lower stages, active power losses, disconnection of secondary circuits, secondary load, steady-state and transient modes.

 

Received:     24.04.2017
Accepted:     29.11.2017
Published:   29.01.2018

 

References

1. Bachurin N.I. Current transformers: calculations and constructions. Moskva-Leningrad: Energiia, 1964. 376 p. (Rus)
2. Overall, mounting and connecting dimensions. Current transformer TOM 765 I G U1. Available at: http://www.zva.zp.ua/pdf/TRT/TOM/TOM_765_I_G_U1.pdf (accessed 03.04.17). (Rus)
3. Gurevich V.I. Protection of current transformers from operation in the mode with an open secondary circuit. Pro elektrichestvo. 2010. No 3/34. Pp. 28–31. (Rus)
4. Gurevich V.I. The protection devices of current transformers from disconnection of the secondary circuit. Promyshlennaia energetika. 2002. No 11. Pp. 15–16. (Rus)
5. KO «Zaporozhskii Zavod Vysokovoltnoi Apparatury». Available at: http://www.zva.zp.ua/ (accessed 03.04.17). (Rus)
6. Koshmider A. Overvoltages on the secondary windings of current transformers when the core is saturated. Izvestiia vysshikh uchebnykh zavedenii. 1972. No 5. Pp. 503–506. (Rus)
7. Checking the current transformers used in the relay protection schemes: SOU-N MPE 40.1.35.301:2004. Kyiv: HRIFRE: Ministerstvo palyva ta enerhetyky Ukrainy, 2005. 71 p. (Ukr)
8. Breakdown fuses type PP-A/3. Available at: https://www.kzeap.ru/katalog/k12.pdf (accessed 13.08.17). (Rus)
9. Breakdown fuse of transformer. Available at: http://leg.co.ua/info/transformatory/probivnoy-predohranitel-transformatora.html (accessed 13.08.17). (Rus)
10. Ravlyk O.M., Hrechyn T.M., Ivanonkiv V.Y. Digital complex for operation analysis and designing of relaying and automation devices. Visnyk DU “Lvivska politekhnika”. 1997. No 340. Pp. 96–101. (Ukr)
11. Certificate of approval of the type of measuring instruments UA.C.34.999.A No. 46123. Current transformers TOM. – 2012. – 5 p. (Rus)
12. Oil-filled current transformers. Current transformers type TOM. Available at: http://www.zva.zp.ua/transformatory-toka-maslonapolnennye/ (accessed 03.04.17). (Rus)
13. TU 14-123-216-2009. Band magnetic cores of magnetic soft amorphous alloys and magnetic soft composition (nanocrystalline) material for measuring current transformers. OAO «Ashinskii metallurgicheskii zavod». Asha, 2009. 9 p. (Rus)