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Krystian szoPAMarek IwAnIEc Joanna IwAnIEc identificAtion of technicAl condition of the overheAd power line supporting structure identyfikAcjA stAnu technicznego konstrukcji wsporczej nApowietrznej linii elektroenergetycznej*Technical diagnostics of the overhead power line supporting structures is very important from the point of view of reliability and the national energy security. The paper presents a method of identification of technical condition of power line supporting structures. The technique is based on testing the correlation between the change of stress in the system and the change of modal parameters caused by damage. Presented approach is comprehensive and accounts for a number of problems related to the diagnostics of large-size objects of complex geometry. The basic advantage of the developed identification algorithm of the overhead power line supporting structures technical condition is low sensitivity to measurement errors, which is very important in the context of exploitational diagnostics.
Structural Health Monitoring of distributed systems is closely connected with data transmission from measurement points to the main server, where measurement data is processed and subjected to expert assessment. Power Line Communication (PLC) technology allows data transmission through existing power network. The greatest advantage of the PLC technology is the possibility of using ubiquitous, electric infrastructure, wherever there is no access to dedicated wired transmission links. However, it should be stressed that the main application of power lines is transmission of electricity while data transmission is a secondary issue. In monitoring systems and distributed measurement systems it is of vital importance that information from measurement points reaches the receiver in the unchanged form. Hash functions rise possibility of proper recognition if transmitted data is an exact mapping of information sent from measurement point. The paper concerns the method of polynomial hash function implementation for PLC systems in the LabVIEW environment.
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