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M. A. Bychin
M. A. Bychin
Postgraduate student
G.V. Plekhanov Saint Petersburg State Mining Institute
Postgraduate student
G.V. Plekhanov Saint Petersburg State Mining Institute

Articles

Geotechnical engineering, powerengineering and automation
  • Date submitted
    2008-09-16
  • Date accepted
    2008-11-13
  • Date published
    2009-03-01

Influence of unbalance currents on operation of group protection against single-phase faults in various modes of network operation

Article preview

We have considered influence of surface complex of current noise on the operations of group protection from single-phase closing to the ground in circuit 6-35 kilovolt with isolated neutral terminal of mountain enterprise. We also have analyzed actions of noise operations of protections in different conditions of circuit: in normal state of working, when short circuit and single-phase closing to the ground arise on protectable connection.

How to cite: Bychin M.A. Influence of unbalance currents on operation of group protection against single-phase faults in various modes of network operation // Journal of Mining Institute. 2009. Vol. 182. p. 65-68.
Electric drive, power supply, automation and control of mining and oil and gas production
  • Date submitted
    2007-11-18
  • Date accepted
    2008-01-24
  • Date published
    2008-05-01

Relevance of application of centralized protection with inverse dependent time-current characteristic of RXIDG type for networks with resistive neutral groundi

Article preview

It is necessary to use considerably highomed resisters because of there are requirements to restrict over voltage by voltage 6-35 kilovolts with the resistive ground neutral to the same meaning in the networks. It makes usage of traditional protection from ground short circuit based on a current curve principle is inefficacious. Special characteristics of current curve the type RXIDG realized on digital relay are offered to use for these purposes. For these protections valuation of sensibility was done and the fields of using for opposite dependence characteristics in dependence on dimensions of networks was viewed. There is necessity for these devices of protections nonlinear characteristic of current curve under perfect tooling for protection of the networks 6-35 kilovolts considerably highomed ground neutral ground short circuit in the article.

How to cite: Bychin M.A. Relevance of application of centralized protection with inverse dependent time-current characteristic of RXIDG type for networks with resistive neutral groundi // Journal of Mining Institute. 2008. Vol. 178. p. 126-129.
Geotechnical engineering, powerengineering and automation
  • Date submitted
    2006-08-03
  • Date accepted
    2006-10-02
  • Date published
    2007-02-01

Development of the stand for research of microprocessor devices of relay protection and automatics

Article preview

The work is dedicated to the creation of a specialized test bench for the study of microprocessor-based (MB) relay protection and automation (RPA) devices. The information about the electrical circuit diagram and its functional capabilities is given. Research and study of the operation of relay protection and automation devices is supposed to be carried out in two stages. The first stage is carried out on a personal computer using specialized software. The second stage - studies using a specialized test bench containing a physical model of the electrical network and a specific MB RPA device. The test bench allows to simulate various conditions - from normal load to emergency modes. It is possible to test protections against interphase blocking, asymmetrical load modes, ground fault protections, and emergency control schemes. This method allows to clarify theoretical knowledge and develop primary skills of working with such devices.

How to cite: Bychin M.A. Development of the stand for research of microprocessor devices of relay protection and automatics // Journal of Mining Institute. 2007. Vol. № 2 170. p. 121-123.