Ons Integrated Disturbance Analysis System
Renan Giovanini2006
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Abstract
The Operator of National Power System-ONS (Brazilian ISO) is responsible for the operation and control of power generation and transmission system of Brazilian grid. As such, one of its tasks is the analysis of disturbances which occur in the National Interconnected System-NIS. In order to do that ONS uses data from fault recorders from multiple generation and transmission utilities. The disturbance recording system installed on the NIS is composed by analog and digital fault recorders at power plants and substations owned by these utilities. Its main goal is to record power system voltage and current waveforms for late analysis of fast transient disturbances (mainly faults), and relays and protection systems performance. Digital Fault Recorders-DFRs have intrinsically capacity to be accessed remotely allowing recorded data files, with digital and analog measurements, to be transmitted to utilities data concentrators-UDCs, usually located on utilities central office. The communication media among DFRs and UDCs, the DFR network architecture and how these data is collected by each utility varies immensely. The data gathering can be automatic or requested manually. In most utilities these records are stored on UDCs located in the corporative intranet. These UDCs usually have access to Internet, but seldom can be accessed from it. This paper describes ONS efforts on developing an integrated system to automatically acquire and analyze DFR records. One of its components is SCAP, a web based client-server system for acquiring DFR records from utilities. With SCAP, ONS staff can easily locate any disturbance file, and analyze it using SINAPE. SINAPE is a universal DFR analysis tool developed by CEPEL, the electric energy research center supported by the Brazilian government. Based on SINAPE technology, advanced tools are being added to SCAP in order to achieve automatic and full analysis of DFR records. As examples, an automatic fault analyzer and a two terminal transmission line fault locator are under implementation.
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