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This paper describes field experience with a measurement system, which has been used to monitor the load behavior of four major loads at 230Kv level during the last 3 years. A statistical analysis of static load model parameters, estimated from 2768 snap shots of voltage perturbations is presented. Most of the perturbations are between 1% and 4%. However, 22 perturbations with voltage variations exceeding 20 Yo have been recorded. The analysis of the same data to fit other more complex models will be discussed in a future paper.

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