Low-ohmic resistors RZ for neutral grounding in 20, 35 kV networks

Low-ohmic resistors RZ are used for neutral grounding in 20, 35 kV networks that enables relay selectivity, overvoltage limitation at single-phase arcing ground faults and ferroresonance elimination.

 

Technical Specifications

No.Rated resistance
(Ohm)
Operating time under rated currentClimatic conditions according to Russian Standard GOST 15150Life time, not less than (years)Design of resistors
1150...2000Short-time (not less than 10 seconds)Cold temperatures and Tropical conditions, category 130Figure 1
210...300Short-time (not less than 10 seconds)Cold temperatures and Tropical conditions, category 2 and 330Figure 2

 

Resistors with required rated voltage, rated resistance, dimensions, for different climatic conditions can be manufactured on request.

 

Design of resistors depending on climatic conditions and place of installation
Place of installation: outdoor or indoor switchgearPlace of installation: indoor switchgear
Figure 1Figure 2

 

Low-ohmic resistors produced by BOLID LLC are designed for short-time operation at single phase-to-ground faults. These resistors have been successfully used in electrcical networks of Russia and Belarus since 2006. Today, based on successful experience, many engineering companies recommend low-ohmic resistors RZ produced by BOLID LLC for implementation in new projects.