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Tecnura

Print version ISSN 0123-921X

Abstract

CAICEDO DELGADO, Nayiver Gladys  and  ANDRADE, Carlos Alberto. Adjustment ANSI 24 overexcitation protection of a synchronous generator for a Siemens 7UM62 relay. Tecnura [online]. 2019, vol.23, n.61, pp.57-68. ISSN 0123-921X.  https://doi.org/10.14483/22487638.13785.

Context:

The protection functions of a generator - transformer group must guarantee its useful life when an abnormal operating condition arises, thus improving the reliability of the electric power service in the electric power system. When the V/Hz ratio of the group increases, saturation may occur in the magnetic core and induce a dispersion flow in the non-laminated components that are not designed to conduct it, and damage can occur in seconds. This is the reason why machines are protected with the ANSI 24 protection function (FDP).

Methodology:

This article presents the theory that justifies the implementation of the ANSI 24 protection function in a generator-transformer group, as well as the methodology to calculate each of the adjustment parameters in a SIEMENS 7UM62 multifunctional relay. The article explains the logical decision diagram in a clear and detailed way, identifying the settings, input signals (analog and binary), and output signals. The logical diagram was organized in three subdiagrams to facilitate understanding and to identify the causes that originate its alarm, start, trip, or block outputs.

Results:

The detailed decision diagram of the ANSI 24 protection function was obtained; the input adjustment criteria of the adjustment parameters and a detailed procedure for calculating each were described. In addition, the numerical results of all the adjustments for the generator-transformer group of Unit 1 of the Salvajina hydroelectric power station were obtained.

Conclusions:

The results of this research recommend obtaining the actual V/Hz heating characteristic or confirming the one delivered by the manufacturer of the equipment to be protected, so that it is possible to have greater precision in the adjustment parameters.

Keywords : ANSI 24; synchronous generator; electrical protections.

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