Technical measures for fault diagnosis of main electrical equipment in substations

In case of abnormal fault of main electrical equipment of substation, it is necessary to ensure the safe operation of substation and provide corresponding guarantee for accident treatment. Once the substation equipment problems, is bound to appear pressure loss. In severe cases, once the substation loses the battery, it becomes troublesome to check and repair the substation equipment, so it is necessary to restore power in a short time after the main electrical equipment of the substation has problems. Restoring power in a relatively short period of time is not only about dealing with equipment problems, but also about avoiding bigger accidents. Operation personnel should master the basic operating condition of the equipment proficiently when dealing with abnormal accidents. Once the accident occurs improper operation, it will cause greater loss to the power system. When there is abnormal or fault of substation main electrical equipment, the staff should report to the leadership, first analysis abnormal failure again, according to the order of the fault and abnormal for scientific judgement, such as to determine the main aspect of the problem and the secondary aspects, according to the judgment of the substation main electrical equipment to be repaired.

1. Measures taken to deal with overheating of main electrical equipment in substation

Generally speaking, the main electrical equipment of the substation overheating situation mainly has the following reasons: first, the main electrical equipment of the substation failure of the lead, thus in the process of use gradually aging phenomenon, then make the joint loose, so that the main electrical equipment of the substation overheating; Second, in the main electrical equipment of the substation, when there is residual material inside, it will lead to the formation of circulation phenomenon, and then make the line short circuit, in this case, the temperature of the transformer will increase significantly; Third, in terms of winding quality, due to the actual operation process will make the winding temperature rise, so there will be overheating of the main electrical equipment in the substation. Combined with the related causes of overheating of power generation equipment, the following measures can be taken to solve the problem: First, for the low-voltage winding structure, it is necessary to use the double explosive spin structure to deal with; Secondly, in view of the main electrical equipment problems of the substation, to remove the internal residual substances in time; Then, according to the lead connection problem, to avoid the existence of gaps; Finally, at least two power supplies should be configured for the strong oil circulation cooling system, and at the same time, switching experiments should be carried out regularly.

2. Measures taken for operation failure of on-load tap changer of main electrical equipment of substation

On-load tap switch during operation, in addition to deal with their own quality related issues, rarely fails, so in the above problems, must be strictly check, mainly manifested in the following aspects: first, after long-term use, switch boxes will appear deformation, cause loss tap-changer happen or is loose, thus causes the transformer Thermal dissipation. Second, the strength of some insulation parts is not up to standard, so that the scoring switch is easy to be damaged when switching operation, so the transformer overheating; Third, the sealing of part of the tank is not good enough, so the combustible gas content of the transformer is too high, and the serious point even appears oil leakage. Fourth, in the operating system, use. The quality of some mechanical parts does not meet certain requirements, so the main shaft fracture occurs in the later operation process, which directly leads to the normal use of the main electrical equipment in the substation. In order to effectively solve the above problems, it is necessary to control the main electrical equipment of the substation from the source, especially to carefully check the quality of the wearing switch. Before running the main electrical equipment of the substation, it is necessary to debug the functions of the main electrical equipment of the substation. In the daily operation and management process, the switch position must be checked regularly to ensure good contact. In addition, switch manufacturers should also be strictly in accordance with the relevant specifications to test the quality of qualified problems, to ensure that the quality of the relevant products or processes can meet the relevant standards after leaving the factory.

3. Relevant measures to deal with anomalies on the low-pressure side of the main transformer

The occurrence of abnormal faults on the low-voltage side of the main transformer poses a great threat to the safe operation of the power grid. Second, switch misoperation. The occurrence of the above situation needs to be judged according to the specific situation of the inspection equipment. Once the overcurrent protection action occurs on the low-voltage side of the main transformer, it is necessary to make a reasonable judgment and protection on the inspection of the relevant equipment immediately. In the process of inspection and protection, draw a correct and reasonable conclusion on the circuit of the main transformer. At the same time, eliminate the main transformer low voltage side switch misoperation. After eliminating the above faults, we should focus on bus fault or line fault. If you want to know the specific fault, you must judge properly according to the check result again. In the process of checking the relevant equipment, the staff must pay attention to check whether the protective pressure plate of the equipment is missing. In the inspection process, whether the equipment in the protection range of the main transformer side at the key checkpoint can be technically reported and scheduled, and relevant inspectors should be informed to handle reasonably after taking safety measures.