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Исследование влияния переходного сопротивления на характеристики защиты от однофазных замыканий основанной на контроле пульсирующей мощности.

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ISSN 2224-9923. !"#$%& '()'*. +!,-,.%/. (!0#!.12,3,! % .,4$,! 5!-,. 2012. 6 4
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*78 621.311
© 91:;$&,3 <.=., 8,"#14!3 ).>., ?;5/&,3 >.>., 2012
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INVESTIGATION OF TRANSITION RESISTANCE
DATA PROTECTION FOR SINGLE PHASE CIRCUITS,
BASED ON A PULSE POWER CONTROL
M.L. Sapunkov, I.A. Kostarev, A.A. Khudiakov
Perm National Research Polytechnic University, Perm, Russia
The effect of transient resistance at the site of an earth fault on the increments of pulsating power lines damaged
and undamaged in a network with isolated neutral and compensated ones were researched. Investigation of the effect
of transient resistance was carried out on the basis of the mathematical description of processes in the erasing of O33
in the network. All necessary calculations were performed using the analytical expressions for the increments of
pulsating power on the lines of the network obtained for different variants of neutral grounding.
In calculating the value of R was varied from 0 to 1000 ohms. The degree of asymmetry of intrinsic conduction
phase lines on the ground with a possible deviation of up to 20 % was determined. The mode is assumed to be
resonant setting compensation for a network with a compensated neutral. According to the calculations there were
constructed plots of the relative magnitude of the increment of the transition from the pulsating power of resistance in
O33 for two variants of neutral grounding, namely for the isolated and compensated neutral grounding .
The constructed curves are made for both damaged and undamaged line. The values of R has a greater effect
on the variable component of the power network with isolated neutral compared to the network with a compensated
neutral. The studies found that the presence of transition resistance at the scene of O33 will significantly reduce the
protection of the controlled signals.
However, the relatively high sensitivity of the current sensors and analog input modules of microprocessor
protection devices will provide the selectivity of protection at a relative comparison principle controlled by signals.
Keywords: medium voltage systems, line-to-earth fault, transition resistance, throbbing power, isolated neutral,
compensated neutral.
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"!#/E 6–35 & P7 34.20.179 (R) 34-70-070-87).
11. Roberts J., Altuve H., Hou D. Review of ground fault protection methods for grounded, ungrounded, and
compensated distribution systems / Schweitzer Engineering Laboratories. – Inc. Pullman, WA USA.
115
<.=. 91:;$&,3, ).>. 8,"#14!3, >.>. ?;5/&,3
12. N!w directional ground fault elements improve sensitivity in ungrounded and compensated networks / / Schweitzer Engineering Laboratories / J. Roberts, D. Hou, F. Calero, H. Altuve. – Inc. Pullman, WA USA.
13. Lorenc J., Musierowicz K., Kwapisz A. Detection of the intermittent earth faults in compensated
MV Network // IEEE Bologna Power tech Conference. – June 23–26 2003.
14. Zielichowski M., Fulczyk M. Ground-fault overvoltage danger in modern unit-connected generators // IEEE power. – 2002. – Vol. 2.
15. Willems J.L., Ghijselen J.A. Apparent power and power factor concepts in unbalanced and nonsinusoidal situations // IEEE Bologna powertech conference. – 2003.
References
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[Relay protection against ground faults in networks with resistor earthed neutral]. 4th vseros. nauch.-tekhn.
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Pullman.
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in ungrounded and compensated networks. Schweitzer Engineering Laboratories. WA USA: Inc. Pullman.
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MV Network. IEEE Bologna Power tech Conference, 2003.
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?@ '!)8.'9
>'14$,8! A%9'%( B"8$%#8!%* ('!4FA, P,""%/) – &1$5%51# #!E$%K!"&%E $1;&, :4,0!"",4 &10!54D L-!&#4%0%&1N%% % 13#,F1#%21N%% .,4$DE :4!5:4%/#%C '!4F"&,., $1N%,$1-A$,., %""-!5,31#!-A"&,., :,-%#!E$%K!"&,., ;$%3!4"%#!#1 (614990, .. '!4FA, 8,F",F,-A"&%C :4,":., 29; e-mail:
ilya_kost@mail.ru).
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D4#0,8! &$)8$ &(",+'$#.8!%* ('!4FA, P,""%/) – 1""%"#!$# &10!54D L-!&#4%0%&1N%% % 13#,F1#%21N%% .,4$DE :4!5:4%/#%C '!4F"&,., $1N%,$1-A$,., %""-!5,31#!-A"&,., :,-%#!E$%K!"&,.,
;$%3!4"%#!#1 (614990, .. '!4FA, 8,F",F,-A"&%C :4,":., 29; e-mail: akhudyakov@mail.ru).
About the authors
Sapunkov Mikhail L. (Perm, Russia) – Ph.D., professor of department for electrification and delfts
automation, Perm national research polytechnic university (614990, Perm, Komsomolsky ave., 29; e-mail:
ilya_kost@mail.ru).
Kostarev Il'ia A. (Perm, Russia) – teaching assistant of department for electrification and delfts automation, Perm national research polytechnic university (614990, Perm, Komsomolsky ave., 29;
e-mail: ilya_kost@mail.ru).
Khudiakov Anton A. (Perm, Russia) – teaching assistant of department for electrification and delfts
automation, Perm national research polytechnic university (614990, Perm, Komsomolsky ave., 29; e-mail:
akhudyakov@mail.ru).
',-;K!$, 10.05.2012
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