2 NON-AIDED SCHEMES
This product provides Distance protection. The Distance protection has been designed for use as a standalone
non-unit protection, or for use with communications systems to provide unit protection (Carrier Aided schemes).
Standalone operation provides basic scheme Distance protection (e.g. instantaneous Zone 1 operation, delayed
Zone 2 protection and further delayed Back-up protection, etc.). It also implements some special standalone
schemes that don’t require communications. These are known as Non-Aided Distance Schemes.
The non-aided schemes provided in this product can be divided into the following categories:
● Basic schemes
● Trip On Close schemes
● Zone 1 Extension scheme
● Loss of Load scheme
The settings for these Non-Aided Distance Schemes are located in the SCHEME LOGIC column.
Chapter 9 - Non-Aided Schemes P543i/P545i
254 P54x1i-TM-EN-1
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