Abb Technology Ag

Abb Power Td & Company

Gregory J Grote

James Stoupis

Richard E Tyner

Marina V Graham

The invention contemplates a technique for providing loop control on a faulted overhead or underground loop system, while preventing restored current from being fed or back fed into the fault. In particular, the invention provides a method, device, and system for restoring power to a faulted loop distribution system. The inventive method includes detecting a fault on the loop distribution system, interrupting current on the faulted part of the loop distribution system, isolating the faulted part of the loop distribution system from an unfaulted part of the loop distribution system, restoring current to the unfaulted part of the loop distribution system, and preventing the current from flowing to the faulted part of the loop distribution system. The method may further include providing the current to a load.

Loop control for distribution systems

A relay test set of reduced size and weight includes a small, highly efficient voltage and current source. The test set incorporates a Class D switching amplifier design that greatly reduces the size of the power source needed to inject the correct voltage and current into the secondary inputs of a protective relay. To further reduce the size, weight and cost of the relay test set, a single voltage amplifier is used to drive both voltage and current secondary inputs of a protective relay. In so doing, this test set then becomes both a voltage transformer and current transformer simulator utilizing a single voltage power source at reduced size, weight and cost. To make the power source variable while maintaining accuracy, a microcomputer module is used to monitor both current and voltage being injected into the protective relay. This microcomputer may also automatically run the required relay tests and route the voltage or current to the appropriate inputs of the protective relay by direct control of a relay matrix.

Growing community of inventors

Jefferson City, MO, United States of America

Gregory J Grote