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access icon openaccess Study on circuit breaker TRV issues of UHV high series compensation lines

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 28/08/2018, Accepted 19/09/2018, Published 23/10/2018

Under the influence of series compensation (SC) capacitance and rated voltage rise, when ultra high voltage (UHV) high SC line occurs inner fault, the short-circuit current through the SC line is greater and the residual voltage across the SC is higher, which cause the electromagnetic transient process excited by high amplitude current and voltage to be more serious in the event of fault occurrence and removal. The security of circuit breaker (CB) equipment is threatened, which make it need further research on the characteristics and put forward some effective solutions. In this study, the characteristics of macroscopic statistical distribution of peak value via short-circuit current of transient recovery voltage (TRV) across CB fracture during switching after short-circuit current zero crossing for UHV high SC line are put forward, and also of the microscopic characterization parameter of waveform rise rate and peak value time. It shows that the TRV switching capability of existing UHV CBs can not cover all the fault scenarios of high SC line. Solutions including comprehensive comparison of TRV optimal suppression measures and increase of the UHV CB switching expected TRV test requirements are put forward, which provide feasible technical scheme for CBs reliable switching of UHV high SC line.

Inspec keywords: power transmission lines; circuit breakers; short-circuit currents; power transmission faults

Other keywords: electromagnetic transient process; TRV switching capability; UHV high SC line; fault occurrence; series compensation capacitance; residual voltage; circuit breaker equipment; UHV CB switching; UHV high series compensation lines; voltage rise; circuit breaker TRV issues; peak value; high amplitude; transient recovery voltage; fault removal; macroscopic statistical distribution; TRV optimal suppression measures; short-circuit current zero crossing

Subjects: Power transmission, distribution and supply; Switchgear

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