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Implement Serial DF1 Client Protocol in an RTAC By Using an acSELerator RTAC Extension
This application guide describes an RTAC implementation of DF1, a robust but simple serial-line protocol that can read and write data from and to an Allen-Bradley PLC. The protocol is implemented with the use of an acSELerator RTAC extension package. Use of the DF1 protocol eliminates the requirement for third-party hardware and programming to connect the SEL RTAC and Allen-Bradley and Rockwell systems.
- Chris Bontje
Modeling Induction Motor Starting Using Basic Motor Data
Application Guide - This application guide provides an example of using basic information about the motor and power system to model the performance of the machine during starting.
- Derrick Haas
- Stanley E. Zocholl
Testing the High-Speed Mho Elements in the SEL-411L and SEL-421
This application guide explains the working and testing procedure of the high-speed mho distance elements available in the SEL-421 Relay and SEL-411L Relay. Use the accompanying spreadsheet to calculate test points for different fault types.
- Jared Candelaria
- Hardesh Khatri
- Muhammad F. Hamid
Calculating and Testing Transformer Thermal-Model Constants
This application guide helps you calculate transformer thermal-model cooling constants to obtain an accurate winding temperature as well as apply those constants to SEL terminology. It also includes a thermal model testing section for initial field commissioning.
- Joshua Hughes
Use the SEL-651R to Implement Concurrent Operation of Fast and Delay Curves
This application guide demonstrates how to simulate concurrent fast and delay curves in the SEL-651R similar to those in the SEL-351R Recloser Control. This provides some advantages in certain applications, such as interfacing with the SEL-FT50 and SEL-FR12 Fault Transmitter and Receiver System and second-harmonic blocking. A sample design template is included that incorporates the concurrent curve method.
- Jeremy Blair
- Larry Wright
Single-Phase Testing of the SEL-787 Differential Element
Application Guide - When testing a differential element, it is desirable to only use current on a single phase. Although this does not simulate actual conditions on a system, it does provide adequate proof that the relay has been set as desired. In addition, single-phase testing simplifies the test and makes it suitable for all test sets because not all test sets have six current channels to drive a three-phase test.
- Jason Young
Implementing Communication Redundancy in the RTAC
This application guide discusses how to provide redundant communications to human-machine interface (HMI) or SCADA systems between two SEL Real-Time Automation Controllers (RTACs). It also includes RTAC example configurations that can be downloaded from the SEL website.
- Brian Waldron
Testing Curve 46 in SEL Motor Protection Relays
This application guide describes how to test user-defined thermal curve 46 in SEL motor protection relays.
- Don Fentie
Creating Impedance Loci From SEL Event Reports
This application guide details the calculations that you can use to create a program that plots impedance loci using SEL event reports and includes a quick-start example using a real event report.
- Don Fentie
Motor Bus Transfer Scheme for a Two-Source Configuration Implemented in the SEL-451
The SEL-451 Protection, Automation, and Bay Control System has extensive logic and protection features, allowing it to be used for many applications. This application guide describes how to implement a motor bus transfer scheme in the SEL-451 for a two-source configuration.
- Fernando Calero
- Derrick Haas