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Protective relays and devices have been developed over 100 years ago to provide “lastline”of defense for the electrical systems. They are intended to quickly identify a fault and isolate it so the balance of
In Part II our series we look at how batteries, potential transformers/CCVTs and communication links contribute to the correct operation
Series-connected protection systems; for example, two-out-of-two protection systems require both relay systems to operate to initiate a trip. While using two-out-of-two increases security, it reduces
Our comprehensive portfolio of protection technology enables reliable grid availability in the voltage ranges of 10 kV to 110 kV. The protective and control devices can be used in, for example, single and
The SEL-751 Feeder Protection Relay is ideal for directional overcurrent, fault location, arc-flash detection, and high-impedance fault detection applications.
The new, patented relay-to-relay logic communication technique repeatedly sends the status of eight programmable internal relay elements, encoded in a digital message, from one relay to the other
SEL feeder relays enhance distribution system safety and reliability with comprehensive overcurrent, arc-flash, and backup protection. They are designed for utility, industrial, and commercial environments.
Provides protection, logic, and metering. All-in-one solution. Combines protection, sensors, control power, and circuit breaker in a single package. Typically added to a breaker close circuit to prevent
Because the protection areas of the interlocking-based protection concept are not overlapping and because they do not reach into the protection area of the next relays in the protection chain, a
The MVAJ range comprises very reliable hinged armature relays designed to directly operate circuit-breaker trip coils. Built to very high specifications, the MVAJ range provides a highly flexible and
A fast and selective arc fault mitigation for air-insulated LV & MV switchgear and Relion protection and control relays and sensor technology protect staff and plant facilities for many years.
When underfrequency protection is employed, two underfrequency relays con-nected with “AND” tripping logic and connected to separate voltage sources are recommended to enhance scheme security.
ED615 Line differential protection and control 1. Description RED615 is a phase-segregated two-end line differential protection and control relay designed for utility and industrial power systems, including