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.
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Relay Protection Devices
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
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.
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.
Intro to Relays #2
This article will explain the basics of the relay numbers used to design a relay''s functionality.
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In North America protective relays are generally referred to by standard device numbers. Letters are sometimes added to specify the application (IEEE Standard C37.2-2008).
ANSI Protective Device Numbering Guide | PDF | Relay | Switch
It provides a comprehensive list of the standard device numbers (such as 51 for time overcurrent relay and 50 for instantaneous overcurrent) and explains how prefixes and suffixes are used to further
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.
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