Troubleshooting Techniques The distribution substation is one of the most important and troublesome sections of the power system. Extended operation and frequent switching make distribution substations more prone to breakdowns and failures. While the preventative maintenance part is necessary to avoid these failures, once they occur, operators and engineers are under tremendous pressure to correct the underlying problem and restart the power supply as soon as possible. Testing of VCB Substations) In this article, we will mainly focus on the most common and most problematic malfunctions of a typical power distribution substation and the measures needed to troubleshoot them. Preventive maintenance is an equally important aspect that helps reduce the possibility of breakdowns or breakdowns. Problems. In this article, we maintain our focus on the troubleshooting techniques for distribution substations that are necessary for immediate power resumption after a sudden outage or error. In fact, every component within the substation plays its part in intermittent power supply and a problem with any of them can easily turn into a disaster. The article will be as comprehensive as possible in this regard Table of Contents: Troubleshooting Principle Troubleshooting Troubles in Circuit Breakers Possible Problems with LV CBs and Related Treatment Problem with Faulty Shutdown and Trigger Problems with Circuit Break/Open Possible Problems with VCB and other equipment MV Brief General Troubleshooting Procedures for Generally Troubleshooting VCBs for Fault Shutdown Brief General Troubleshooting Procedure for General Troubleshooting of VCBs for Tripping Failure Special Notes: Electrical Arrangement Problems in Control Diagrams or Wiring Conclusion: Troubleshooting and Override Problems 1. Simple Troubleshooting Principle, Troubleshoot Troubleshooting is 80% diagnosed and 20% cured. It is a process that includes rigorous search for any defect that caused the disruption and remedial measures to bring it back to normal or back to working condition. Electrical system operates in a well-planned hierarchy of voltage and insulation levels, most problems in electrical system are caused by poor insulation level, apart from that, there are many other internal and external factors recorded over the years such as faults/most common source of power supply disturbance. However, some manage to just happen all of a sudden and surprise everyone, including trained technicians who work hard to diagnose the error. Troubleshooting requires a quick fix and fixes the problem that has disabled the device, possibly cutting off the power supply. This requires a series of checks and tests that will be described in more detail in this article. On the contrary, preventive troubleshooting is more about finding the actual cause of accidental malfunctions, inconveniences or abnormalities in the system according to manuals and plans. This is practiced when the device is not completely broken but there may be an issue in the near future with some occasional malfunctions without specific cause. Figure 1 – Low Voltage Panel Preventive Troubleshooting Figure 1 – Low Voltage Panel Preventive Troubleshooting Refer to Table of Contents 2. Troubleshooting Troubleshooting of Circuit Breakers Circuit breakers are arguably the most important part of the protection system in any distribution substation . While VCBs are in abundance in the MV/LV category, ACBs sit firmly at the top of the protection system for an LV power distribution station. Main trip relays, protection relays etc. are the main components of circuit breakers in MV/LV distribution substation. This article/technical guide requires a premium membership. You can choose a Plus, Pro, or Enterprise membership plan on an annual basis. Subscribe and enjoy the study of specialized technical articles, online video courses, electrical engineering guides and research. With an EEP Premium Membership, you get an additional core that enhances your knowledge and expertise in the low, medium and high voltage engineering fields. Check the benefits of each plan and choose the membership plan that best suits you or your organization. The subscription plan includes a 50% discount on all EEP Academy video courses and packages. Login » Find out more »
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