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Calculating Thermal Lockout Reset Time in the SEL-710 and SEL-710-5 Motor Protection Relays
This application guide explains how to calculate the time to reset after a thermal lockout condition. Use the accompanying spreadsheet to calculate the reset time based on relay settings and load current. This can be used to verify if the thermal model settings are compatible with the operational requirements of the motor.
- Krithika Bhuvaneshwaran
Using a Script to Automate Firmware Updates for SEL-3610, SEL-3620, or SEL-3622 Devices
This application guide explains how to use a script to easily update the firmware on one or more SEL-3610, SEL-3620, or SEL-3622 devices.
- George Masters
- Brian Crites
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
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
Using the SEL-2100 Logic Processor in Bypass Breaker Mirrored Bits Communications-Assisted Tripping Schemes
Application Guide - In a main and transfer bus arrangement, the bypass breaker can be used to take a line breaker out of service and maintain system integrity. However, the performance of the protective system is degraded if the communications circuit is not rerouted to the bypass breaker protection.
- Brad Heilman
Effect of Zone 3 Settings on Fault Type Selection in SEL-121F, SEL-121S, SEL-121-0, SEL-221F, SEL-221S, and SEL-221-16 Relays
Application guide - The SEL-121F, SEL-121S, SEL-121-0, SEL-221F, SEL-221S, and SEL-221-16 Relays were designed in the 1980s and include phase and ground distance elements. There is not enough processing power in an eight-bit microcontroller to check all of the distance elements (AB, BC, CA, AG, BG, and CG) for each zone during every one-quarter-cycle processing interval. Therefore, these relays use a method for faulted phase identification that is described in this application guide.
- David Costello
- Karl Zimmerman
Single-Phase Testing of the SEL-487E Differential Element Without State Simulation
Application Guide - This application guide demonstrates steady-state, single-phase testing of the SEL-487E Transformer Protection Relay differential element and does not require state simulation. For a complete reference on testing this relay, refer to SEL Application Guide AG2010-07 [1].
- David Costello
- Jason Young
Automating Common RTAC Maintenance Tasks Using Python Scripts and SEL Software
This application guide shows how to reduce effort and complexity when performing common device management tasks (such as upgrading firmware) for the SEL Real-Time Automation Controller (RTAC).
- Mike Jones
- Bryan Fazzari