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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.
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.
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.
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.
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.
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.
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.
This application guide describes how to test user-defined thermal curve 46 in SEL motor protection relays.
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.
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.