scope:

Foreword

Several utilities are experimenting with electronic devices to reduce voltage fluctuations. Industrial customers with sensitive loads are installing different electronic devices to mitigate voltage fluctuations. A significant number of these devices are installed every year. Most of these devices are bought using specifications provided by various manufacturers. Technical literature describes the operation of specific devices and provides results of computer simulations to prove the effectiveness of the devices. However, no document defines the technical data that has to be collected and used for the specification of a new device.

The working group collected specifications from different manufacturers and utilities. These documents have been combined together to define a comprehensive method for the specification of future devices. This guide is not a tutorial. The application of its content to prepare a specification requires technical knowledge and understanding. Each user should modify the material to meet with user specific conditions. This guide does not include all topics necessary for every application and does not address the commercial aspect of the specifications.

Scope

This guide provides general guidelines for the preparation of a functional specification for solid-state electronic series devices used mainly for compensation of voltage fluctuation. The guide covers devices rated to medium voltage (1-35 kV). In general, these devices contain: an inverter, a rectifier or dc-to-dc converter, an energy storage device, injection transformers connected in series with the load, and a normally open by-pass switch.

In order to interface these devices with the load, additional equipment should be provided including current and potential transformers, bypass and isolation breakers, fast acting solid-state bypass switch, and threephase low-voltage service for auxiliary power.