«NIPO» JSC (Perm, Russia):

Tyulenev M. E., Head of R&D Department, e-mail: nipo@pstu.ru
Levashov V. S., Head of Course of Prospective and Innovation Developments

«Galurgiya» JSC (Perm, Russia):

Lebedev Yu. A., Head of Electrotechnical Department
Khuzin R. A., Chief Specialist

This article describes the brief analysis of existing systems of resonance neutral grounding. There is also given the description of system of ground fault neutralization «Ground Fault Neutralizer». The described system makes it possible to do the compensation of residual active ground fault current and is characterized by high operating speed. Capacitive component of one-phase circuit current is compensated by means of arc-suppression coil. At the same time, active component is compensated by means of inverter, which is connected to the secondary winding of reactor. The system has the following basic components:
-dry-type transformer for neutral release;
-dry-type or oil-type arc-suppression coil with sampled change of compensation current value;
-inverter, which is functional as a compensator of residual current (reactor detuning current and active component of one-phase ground fault current);
-microprocessor control system, which realizes the functions of transmitter control, resonance reactor adjustment, inverter control and localization of one-phase ground fault.
The considered system makes it possible to provide the qualitatively new level of electrosecurity in high-voltage distribution systems, and to provide the uninterrupted operations with established short circuit to the moment of reveal of the place of short circuit. The function of definition of distance to the place of faultiness rise is additional function of the considered system.

1. Pravila ustroystva elektroustanovok (Regulations of design of electrical installations). Eddition 7, 2010.
2. Sistema neytralizatsii toka odnofaznogo zamykaniya na zemlyu «Ground Fault Neutralizer» (System of neutralization of current of one-phase ground fault «Ground Fault Neutralizer»). Available at: http://zaonipo.ru/zao-nipo/sistema-neietralizacii-toka-odnofaznogo-zamikaniya-na-zemlyu-ground-fault-neutralizer.html (accessed: September 13, 2013).