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CHAPTER 9 Capstone PROTECTIVE RELAY FUNCTIONS CHAPTER 9: PROTECTIVE RELAY FUNCTIONS Introduction The Capstone microturbine generator may be connected in parallel to a utility grid to power local Grid Connected loads. When installed in this fashion, power generated by the microturbine is supplied to these loads only when the utility grid voltage is present. Utilities commonly require that protective relay devices be installed with generators connected to their grid. The primary purpose of these devices is to ensure that the local generator will not energize utility wires de-energized by the utility. Typically, these protective relay devices are dedicated relays or solid-state power analyzers that provide control signals to disconnecting devices. This document presents information for the protective relay functions incorporated into Capstone microturbines. The C200 microturbine has built in protective relay functions. Programmable settings for the protective relay functions are stored in nonvolatile memory within the microturbine. As a result, any changes remain set even after an interruption in utility power. Detailed information on how to set these protective functions is provided in the C200 microturbine User’s Manual (400008) and CRMS Technical Reference User’s Edition (410013). During utility grid voltage interruptions, the microturbine senses the loss of utility voltage and disconnects from the grid and the local loads. When the grid voltage returns to within its specified limits, the microturbine may be programmed to restart and supply power to the connected loads. Figure 9-1 shows the relationship between the microturbine, local loads and the utility grid. Figure 9-1. Grid Connect System Configuration 410066 Rev C (June 2009) 9-1 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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