Invariant protection of high-voltage electric motors of technological complexes at industrial enterprises at partial single-phase ground faults

• Published in: IOP conference series. Materials Science and Engineering Vol. 327; no. 5; pp. 52027 - 52032
• Main Authors: Abramovich, B N, Sychev, Yu A, Pelenev, D N
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.03.2018
• Subjects: Algorithms; Circuits; Damage; Electric motors; Electrical installations; Faults; High voltages; Invariants; Power consumption; Selectivity
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/327/5/052027

Development results of invariant protection of high-voltage motors at incomplete single-phase ground faults are observed in the article. It is established that current protections have low action selectivity because of an inadmissible decrease in entrance signals during the shirt circuit occurrence in the place of transient resistance. The structural functional scheme and an algorithm of protective actions where correction of automatic zero sequence currents signals of the protected accessions implemented according to the level of incompleteness of ground faults are developed. It is revealed that automatic correction of zero sequence currents allows one to provide the invariance of sensitivity factor for protection under the variation conditions of a transient resistance in the place of damage. Application of invariant protection allows one to minimize damages in 6-10 kV electrical installations of industrial enterprises for a cause of infringement of consumers' power supply and their system breakdown due to timely localization of emergency of ground faults modes.