Protection from ground faults in the stator winding of generators at power plants in the Siberian networks

• Published in: Power technology and engineering Vol. 44; no. 1; pp. 79 - 82
• Main Authors: Vainshtein, R. A., Lapin, V. I., Naumov, A. M., Doronin, A. V., Yudin, S. M.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-05-2010
• Subjects: ALTERNATING CURRENT; CONTROL; CURRENTS; DIRECT CURRENT; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; ELECTRICAL EQUIPMENT; ELECTRICAL FAULTS; Electrical Machines and Networks; Energy; Energy Systems; ENGINEERING; Faults; Foundations; Generators; Geoengineering; Grounds; Hydraulics; Networks; Power Electronics; POWER GENERATION; POWER PLANTS; Renewable and Green Energy; SAFETY; STATORS; TRANSFORMERS; Winding; stator winding; ground fault protection; application of control current
• ISSN: 1570-145X; 1570-1468
• DOI: 10.1007/s10749-010-0145-9

The experience of many years of experience in developing and utilization of ground fault protection in the stator winding of generators in the Siberian networks is generalized. The main method of protection is to apply a direct current or an alternating current with a frequency of 25 Hz to the primary circuits of the stator. A direct current is applied to turbo generators operating in a unit with a transformer without a resistive coupling to the external grid or to other generators. Applying a 25 Hz control current is appropriate for power generation systems with compensation of a capacitive short circuit current to ground. This method forms the basis for protection of generators operating on busbars, hydroelectric generators with a neutral grounded through an arc-suppression reactor, including in consolidated units with generators operating in parallel on a single low-voltage transformer winding.