NUMERICAL RELAYS

NUMERICAL RELAYS

 What is a numerical relay?

In utility and industrial electric power transmission and distribution systems, a numerical relay is a computer-based system with software-based protection algorithms for the detection of electrical faults. Such relays are also termed as microprocessor type protective relays.

What are the types of numerical relay?

Based on the protection schemes incorporated in power systems, numerical relays are divided into the following categories:

• Over-current / Earth fault relay.
• Differential relay.
• Directional relay.
• Under / Over-voltage relay.
• Distance relay.

What are components of numerical relay?

Numerical relay has two memories, RAM and ROM. Random Access Memory (RAM) is responsible for retaining the input data to the relay and processing the data during compilation. Read-Only Memory (ROM) is the storage unit of the relay. It stores the software needed and other data.

NUMERICAL RELAYS VS. ELECTROMECHANICAL RELAY- COMPARISON

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