Long-range redundancy of protection failures in 0,4 kV networks at gas transportation enterprises
- 1 — G.V. Plekhanov Saint Petersburg Mining Institute
- 2 — LLC Gazpromtransgaz Saint Petersburg
Abstract
The electrical networks of voltage 0,4 kilovolt are the most widespread ones, they are used at all industrial and agricultural enterprises, power stations and substations. Fail-safe operation of enterprises depends to a large extent on these networks. A problem of remote reservation of failures of guards and cutout switches has always been very acute in the networks of 0,4 kilovolt. Due to a very substantial reduction of values of short-circuit currents as the distance between a point of fault and power supplies increases, it was not possible to carry out this reservation by the same traditional methods as in high-voltage power networks. This problem has been found possible to be solved only in recent years when digital technology began to be used for protection of electrical networks.