ABB REL 521*2.3 Line Distance Protection Terminal Technical Reference Manual

About this manual

This technical reference manual provides detailed information on the ABB REL 521*2.3 line distance protection terminal, including its functions, settings, and technical specifications. It covers various protection functions such as distance protection, overcurrent protection, thermal overload protection, and voltage protection. The manual also includes diagrams and logic blocks for each function, as well as input and output signal details. It is intended for engineers and technicians who need to configure and operate the terminal.

What's inside

• Introduction to the Technical Reference Manual
• General Terminal Parameters
• Common Functions
• Distance Protection (ZM)
• Automatic Switch onto Fault Logic (SOTF)
• Local Acceleration Logic (ZCLC)
• Phase Selection Logic (PHS)
• Power Swing Detection (PSD)
• Power-Swing Logic (PSL)
• Pole Slip Protection (PSP)

Specifications

Frequently asked questions

What is the DocID for this manual?

The DocID is 1MRK 506 069-UEN.

When was this manual issued?

This manual was issued in May 2001.

What is the manufacturer of this terminal?

The manufacturer is ABB Automation Products AB.

Where is the manufacturer located?

The manufacturer is located in SE-721 59 Vasteras, Sweden.