Abstract
A distributed system of protection and diagnostics of support structural elements of high-voltage power lines (HVPL) on 500 kV voltage was developed at Karaganda State technical university: - current monitoring of leakage currents of bunches of suspension insulators; - detection ice-rime depositions; - cathode protection of underground elements of support constructions; - information transfer from the sensors placed on supports on the control office on telemetric channels; - creation of the passport of each support on SCADA – system basis. The system contains set of local subsystems constructively placed on the HVPL support, telemetry subsystem providing processing and information transfer from the sensors placed on support, a subsystem of processing and information storage on the control offices of different level. Power supply of local subsystems is provided from the directed energy of electromagnetic fields. The local subsystem consists of three identical, hybrid sensors of a leakage current of suspension insulators, Ice-rime depositions detection is carried out by the indirect methods based on the current monitoring of support reaction to wind and ice loads, and also temperatures and air humidity. Information from sensors allows to control the integral values of a leakage current of the industrial frequency and surface currents of the partial discharges proceeding through insulators bunches, and also to define the time point which is optimum for ice-rime depositions. Radio modem, cellular, and also satellite communication with an automatic channels choice of communication in the conditions of the powerful electromagnetic fields having significant effect on an opportunity and transmission quality of information is used for telemetric information transmission to the control office The passport of each controlled section support of HVPL which has the information archive on technical elements condition of HVPL construction support, trends of leakage currents, about the current alert conditions with localization of the place, time and a type of an alert condition was created in the control office.
Highlights
In the CIS countries power transmission on long distances is carried out by air high-voltage power lines (HVPL) [1]
The protection system and diagnostics represents set of the local subsystems which are structurally placed on the HVPL support, the telemetry subsystem providing processing and information transfer from the sensors placed on support, a subsystem of processing and storage information on control office of various level
Information transfer from the sensors placed on supports on the control office on telemetric channels;
Summary
In the CIS countries power transmission on long distances is carried out by air high-voltage power lines (HVPL) [1]. Remote contactless ways of preventive control of insulators with use of electron-optical defectoscopes [2,3,4,5,6,7] are used Realization of these methods requires direct visual contact with supports diagnostics can be made only selectively and with a big frequency. There are various ways of measurement control of the ice load of the current carrying elements of overhead power transmission lines [10,11,12,13] based on the analysis of various physical effects accompanying ice depositions These ways weren't widely adopted because of insufficient sensitivity, big mistakes, and high complexity and insufficient reliability of ice detection on HVPL. High reliability of the telemetry channel is provided with use of various channels of the local system, situated on HVPL support and dispatch center with automated variant choice (radio modem, cellular, and satellite communication) according to authenticity criterion of information
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