Principles of combining start signals of a set of fault detectors or measuring units of relay protection to increase its sensitivity

Changes in the communication system in the electric power industry, the use of highperformance intelligent control and protection devices allow the innovation of new more sophisticated and sensitive relay protection algorithms.

In this paper proposes the new method of combining binary start signals of a set of fault detectors (or measuring units) of relay protection. The method is based on the statistical detection theory and the likelihood ratio test.

The method makes it possible to make multi-parametric relay protections from a set of individual elementary one-dimensional fault detectors (or measuring units). The combining of the fault detectors in the simplest case is done according to the rule “or”. Method increases the sensitivity of relay protection on account of the multi-parametric measurements.

To increase the relay protection sensitivity, additional conditional settings are necessary. The number of conditional settings is limited only by the performance of the hardware of the relay protection devices.

The paper gives a numerical example of two-parametric relay protection that implements the proposed method.

Keywords

multi-parametric relay protection, information approach, fault detectors, likelihood ratio test, setting, conditional settings

Acknowledgment

The work was carried out with the financial support of the Ministry of Education and Science of the Russian Federation (Agreement No. 14.577.21.0244 on the provision of a subsidy dated September 26, 2017, the unique project identifier RFMEFI57717X0244).

Received

16.01.2019

Publication date

16.01.2019

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GOST	Sharygin M. Principles of combining start signals of a set of fault detectors or measuring units of relay protection to increase its sensitivity // Izvestiia Rossiiskoi akademii nauk. Energetika – 2018. – Issue 6 C. 38-49 [Electronic resource]. URL: http://ras.jes.su/energetika/s000233100003518-3-1-en (circulation date: 02.05.2024). DOI: 10.31857/S000233100003518-3
MLA	Sharygin, M. "Principles of combining start signals of a set of fault detectors or measuring units of relay protection to increase its sensitivity." Izvestiia Rossiiskoi akademii nauk. Energetika 6 (2018):38-49. DOI: 10.31857/S000233100003518-3
APA	Sharygin M. (2018). Principles of combining start signals of a set of fault detectors or measuring units of relay protection to increase its sensitivity. Izvestiia Rossiiskoi akademii nauk. Energetika (6), pp.38-49 DOI: 10.31857/S000233100003518-3

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