ANSI (IEEE) Protective Device Numbering
Protective relays are commonly referred to by standard device numbers. For example, a time overcurrent relay is designated a 51 device, while an instantaneous overcurrent is a 50 device.
ANSI Device Numbers and Acronyms
The ANSI standard device numbers ( As per ANSI/IEEE standard C37.2) are used in the design of an electrical power system. These devices protect the electrical network in the case of a
ANSI codes and IEC Relay Symbols – Electrical Engineering
To assist the Protection Engineer in converting from one system to the other, a select list of ANSI device numbers and their IEC equivalents are given in the following figure.
Protection Relay
In the design of electrical power systems, the ANSI Standard Device Numbers denote what features a protective device supports (such as a relay or circuit breaker). These types of
ANSI device numbers
In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments.
ANSI Relay Protection Code List
This document lists 57 ANSI codes and their corresponding descriptions of protection devices and functions.
Table of ANSI IEEE Standard Device Numbers
This table details ANSI IEEE Standard Device Numbers as used for protective relaying in North America. Suffixes for numbers are also suggested.
ANSI Standard Device Numbers & Common Acronyms
ANSI Standard Device Numbers & Common Acronyms ANSI Standard Device Numbers & Common Acronyms
Protective Relay Basics
Fundamental concepts and terminology will be taught using the electromechanical overcurrent relay as a foundation and then these concepts will be expanded to modern numerical relays.
Protection and Control Device Numbers and Functions
The protection and control devices in electrical equipment can be referred to by numbers, with appropriate suffix letters when necessary, according to the functions they perform.
Optical Power Meters & Sources
High-precision power meters (Ge/InGaAs) and stabilized light sources for insertion loss and return loss testing.
OTDR & Fiber Characterization
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OSA & Eye Diagram Analyzer
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BERT & Endface Inspection
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