Maximum Overcurrent Protection of Electrical Installations with Remote Selection of Settings

Abstract

This paper presents that one of the urgent tasks of the modern electric power industry is to build current protections for electrical installations that do not use current transformers with ferromagnetic cores. It is shown that magnetically controlled inductance coils can be used to build such protections, installing them near the current-carrying buses of the electrical installation, as they have important advantages for relay protection in comparison with other magnetically controlled elements: they do not need temperature compensation devices, can simultaneously perform the functions of analog-discrete converter, measuring converter and measuring protection body. The considered overcurrent protection (overcurrent protection) of electrical installations has positive characteristics in comparison with traditional overcurrent protections, made with the use of current transformers and current relays with ferromagnetic cores. The result is the creation of resource-saving current protections made on inductance coils to protect electrical installations. A new design of current protection on inductance coils with remote selection of its settings for electrical installations connected to a the switchgear cell of a complete switchgear (CCS) is proposed. The maximum current protection with the presented implementation scheme, once again confirms the possibility of building current protections for the various electrical installations connected to the switchgear, with the installation of an inductance coil inside the switchgear. The use of the presented protection increases t