Nomenclature; Product Scope - GE MiCOM P40 Agile Technical Manual

2.3

NOMENCLATURE

Due to the technical nature of this manual, many special terms, abbreviations and acronyms are used throughout
the manual. Some of these terms are well-known industry-specific terms while others may be special product-
specific terms used by GE. The first instance of any acronym or term used in a particular chapter is explained. In
addition, a separate glossary is available on the GE website, or from the GE contact centre.
We would like to highlight the following changes of nomenclature however:
● The word 'relay' is no longer used to describe the device itself. Instead, the device is referred to as the 'IED'
(Intelligent Electronic Device), the 'device', or the 'product'. The word 'relay' is used purely to describe the
electromechanical components within the device, i.e. the output relays.
British English is used throughout this manual.
●
The British term 'Earth' is used in favour of the American term 'Ground'.
●
2.4

PRODUCT SCOPE

Redundancy is required where a single point of failure cannot be tolerated. Redundancy is therefore applied to
critical applications such as substation automation. Redundancy acts as an insurance policy, providing an
alternative route if one route fails.
The Redundant Ethernet Board (REB) assures "bumpless" redundancy at the IED level. "Bumpless" in this context
means the transfer from one communication path to another without noticeable consequences.
GE provides a range of REBs for its IED products. A REB is usually fitted as an option before the IED is shipped, but
can be ordered retrospectively if required.
Px4x-REB-TM-EN-6
Chapter 1 - Introduction
5