6–35 kV electrical networks operates with isolated or compensated neutrals. Such mode of a neutral is the reason of emergence of considerable overvoltage in an electrical network during single- phase ground fault (SFGF), especially during short-circuit through an arc and various ferro-resonance phenomena. These overvoltage destroy the insulation of the electrically coupled network.
Existing domestic technical facilities for setting up and checking current protection are mainly based on analogue devices, which do not provide the required check accuracy but are time-consuming. With the appearance of digital testing systems, a protection check can be automated. An appropriate algorithm and its digital implementation have been developed for the automatic check of current protection characteristics using a digital testing system.
When you set up a routine check and certain complex relays, such as relay of the direction of power of the RBM series, difficulties with test performance of electromechanical relays using traditional analog technical means of verification. For configuration and verification of relay protection and automation ( RPA ) performed both analog and digital on the principle of recently used special test system implemented on a digital basis. These devices allow you to quickly and efficiently perform set-up and verification of complex sets of relay devices and certain complex relay.
The specialized module of check of distance protection is developed for digital test system