Transformers are one of some important equipments on electricity network. Each utility, in this case PLN P3B Jawa-Bali, has to assure their reliability in order to maintain electrical power system stability by assessing transformer conditions. Once transformer condition attained, appropriate maintenance and operation strategy can be defined.Based on failure investigation, transformer conditions are influenced by its insulation condition. PLN P3B Jawa Bali has applied dissolved gas and oil characteristic diagnostics. Since the load grows faster than the network expansion, our transformers tend to be operated at their nominal value or even overloaded. We also find out that through fault current is one of transformers failure root causes. Therefore, we are developing on-line thermal monitoring and vibration in order.The oil and winding temperatures are dependant to load. As the load increases to its nominal value, risk due to transformer paper insulation damage caused by disturbances becomes higher. Subsequently the situation will accelerate the transformer to ageing. By recognizing the raise and fall function of these temperatures to load we can identify the thermal characteristics of the transformer. Other characteristic will be identified is dissolved gas increase caused by feeder faults. Based on these characteristics we are able to conduct some actions, for example: maintaining the temperatures in safe range by controlling cooling system (prohibiting ageing) or determining the condition status of the transformer at that particular time.In this paper we would like to describe our experience in developing the thermal statistic characteristics using load and temperature manual data acquisition, and dissolved gas produced by feeder faults.
Operated transformers shall experience simultaneous stresses, for example mechanical, thermal, and chemical stresses. In general the higher the load is, the higher the stresses will be. The performance of a transformer is depended on its main insulation condition which is limited by the working temperature. By considering the insulation deterioration process and based on the failure modes and effect analysis we found out that besides overloading scheme, external disturbances and ambient condition has affected the transformer performance. Thus we rely on the loading and calculated hot spot temperature, dissolved gas analysis (DGA), and insulation quality as determined parameters of transformer condition. The boundary values of loading temperature, DGA, and insulation quality are obtained statistically while for the hot spot derived from hot spot calculation and paper insulation standard. In this paper we would like to describe our experiences in developing power transformer condition assessment based on thermal approaching.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.