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Microprocessor-based diagnostic device for protecting the generator-transformer unit from a single-phase ground fault

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Hydrotechnical Construction Aims and scope

Conclusions

  1. 1.

    A microprocessor-based device was developed for checking (measuring) the level of the insulation resistance of the stator winding of a unit in the range 0.5–500 MΩ and absorption coefficient in the range 1–10 with output of the measurement results to a digital indicator.

  2. 2.

    All measurements are taken on a stopped or operating unit in a semiautomatic regime after pushing a button on the face panel of the device. It is possible to use the device as part of a process control system or in a diagnostic system with automatic control from a computer.

  3. 3.

    The device underwent a check on the units of the Skhodnya and Chirkey hydrostations, where it showed good results. It is suggested that it be introduced.

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Literature cited

  1. P. T. Anokhin, A. A. Finkel', “Protection from ground faults and check of the insulation of a generator stator winding,” Elek. Stan., No. 7, (1973).

  2. V. N. Vavin, Protective Relays of Turbine Generator-Transformer Units [in Russian], Énergoizdat, Moscow (1982).

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  3. V. M. Kutin, A. V. Kobylyanskii, O. I. Kul'matitskii, and A. P. Kunash, “Improvement of the means of protection from single-phase ground faults in the generator-transformer unit,” Elek. Stan., No. 4 (1986).

  4. V. B. Kulakovskii, Preventive Tests and Defects of Insulation of Large Electric Machines [in Russian], Énergiya, Moscow (1970).

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  5. A. M. Karpov, T. M. Memeni, V. N. Rusinov, et al., “Device for protecting the stator of an electric machine from ground faults,” USSR Author's Certificates 980205 and 955323, Otkr. Izobr., No. 45 (1982).

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Authors
  1. T. M. Némeni
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  2. A. M. Panteleev
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  3. A. M. Krasil'nikov
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  4. E. A. Gavrilina
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Additional information

Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 43–45, September, 1989.

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Némeni, T.M., Panteleev, A.M., Krasil'nikov, A.M. et al. Microprocessor-based diagnostic device for protecting the generator-transformer unit from a single-phase ground fault. Hydrotechnical Construction 23, 549–552 (1989). https://doi.org/10.1007/BF01432067

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  • DOI: https://doi.org/10.1007/BF01432067

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