Diagnostic Devices for Remote Controller of Synchronous Machines
DOI:
https://doi.org/10.31498/2225-6733.39.2019.201067Keywords:
synchronous machine, brushless exciter, breakdown diagnosis, rotating rectifier, excitation windingAbstract
In this paper, the prerequisites of creating a device for diagnosing the breakdown of the rectifier diodes and discharge thyristor of the brushless exciter of the synchronous machine without the need for its disassembly are considered. The processes occurring in the exciter and its rotating rectifier are analyzed. Requirements for the system of diagnosis of the exciter are formulated. The results of laboratory experiments performed are shown, the possibility of providing diagnostics (detection of breakdown) of rotary elements of the exciter (diodes, discharging thyristors) before starting the machine by applying a 220 V 50 Hz voltage to the exciter’ excitation winding are shown. It is shown that the damage of the exciter elements located on the rotor can be detected by analyzing the EMF of the excitation winding of the exciter, for which it must be powered from a source with high output resistance (a gyrator with the active elements was used in the experiment). An electrical circuit diagram of a system for diagnosing the elements of the exciter located on the rotor, which is made on the basis of a single-crystal microcontroller and allows to detect the breakdown of the diodes of the rotary rectifier or the discharge circuit on the stopped machine (before starting). In addition, during machine startup, the proposed system captures the firing voltage of the discharge circuit, and during operation – measures the voltage at the output of the rotary rectifier. The data transmission from the exciter rotor, on which the proposed system is installed, is carried out by the use of an air transformer by the method of back-scatteringReferences
Перелік використаних джерел (ДСТУ):
Чередник Н.Г. Дослідження режиму синхронного генератора когенераційної установки у складі системи електропостачання малого промислового підприємства / Н.Г. Чередник, О.В. Бялобржеський // Гірнича електромеханіка та автоматика. – 2015. – Вип. 94. – С. 139-146. – Режим доступу : http://nbuv.gov.ua/UJRN/geta_2015_94_27.
Simulations of Rotating Brushless AC Excitation System with Controlled Thyristor Bridge Rectifier for Hydropower Generators [Електронний ресурс]. – Режим доступу : http://www.diva-portal.org/smash/get/diva2:476290/fulltext02.
Maintenance Free Exciter [Електронний ресурс]. – Режим доступу : https://voith.com/corp-en/VH_Product_Brochure_Automation_Maintenance-free-exciter_15_vvk_t3404e_en.pdf.
DGC Brushless Excitation – Emerson Process Management [Електронний ресурс]. – Режим доступу : https://www.yumpu.com/en/document/view/11400516/dgc-brushless-excitation-emerson-process-management.
Brushless Excitation System Series Diode Redundancy for 2-pole Generators 265-700kW at 3,000-3,600rpm [Електронний ресурс]. – Режим доступу : http://www.electricmachinery.com/_
files/Brushless_Exciters/Series_Diode_Redundancy.pdf.
Thyricon Excitation System, Voith [Електронний ресурс]. – Режим доступу : http://voith.com/br/t3387_e_Thyricon_screen.pdf.
References:
Cherednyk N.H., Byalobrzhes’kyy O.V. Doslіdzhennia rezhimu sinkhronnogo generatora kogeneratsіinoї ustanovki u skladі sistemi elektropostachannia malogo promislovogo pіdpriєmstva [Investigation of the mode of synchronous generator of a cogeneration unit within the power supply system of a small industrial enterprise]. Gіrnicha elektromekhanіka ta avtomatika – Mining Electrical and Automation, 2015, vol. 94, pp. 139-146. (Ukr.)
Simulations of Rotating Brushless AC Excitation System with Controlled Thyristor Bridge Rectifier for Hydropower Generators Available at : www.diva-portal.org/smash/get/diva2:476290/
fulltext02 (accessed 15 September 2019).
Maintenance Free Exciter Available at : www.voith.com/corp-en/VH_Product_Brochure_
Automation_Maintenance-free-exciter_15_vvk_t3404e_en.pdf (accessed 5 August 2019).
DGC Brushless Excitation – Emerson Process Management Available at : www.yumpu.com/en/
document/view/11400516/dgc-brushless-excitation-emerson-process-management (accessed 5 August 2019).
Brushless Excitation System Series Diode Redundancy for 2-pole Generators 265-700 kW at 3,000-3,600 rpm Available at : www.electricmachinery.com/_files/Brushless_Exciters/Series_
Diode_Redundancy.pdf (accessed 30 June 2019).
Thyricon Excitation System, Voith Available at : www.voith.com/br/t3387_e_Thyricon_screen.pdf (accessed 25 September 2019).
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