Introduction: With the development of electrification construction, static shunt capacitors, as compensation elements for reactive power compensation in power grids, are increasingly used in power supply networks. To reduce the damage rate of compensation capacitors in rural areas, the following preventative measures can be taken: Keywords: Reactive power compensation; Capacitor. With the development of rural electrification construction, static shunt capacitors, as compensation elements for reactive power compensation in power grids, are increasingly used in rural power supply networks. To reduce the damage rate of compensation capacitors in rural areas, the following preventative measures can be taken: 1. Strengthen inspection, maintenance, and patrol. Shuttle capacitors should be inspected regularly during power outages, at least once per quarter. The main checks should include whether there is accumulated dust or dirt on the capacitor casing, porcelain bushings, and mounting brackets, and these areas should be thoroughly cleaned. During inspection, special attention should be paid to whether the connections at each point are secure and loose; whether the casing is bulging, leaking oil, etc. If any of the above phenomena are found, the capacitor must be taken out of operation and properly handled. 2. Control Operating Temperature Under normal conditions, the temperature of the hottest spot on the casing of a parallel capacitor should not exceed 60℃. Otherwise, the cause must be investigated and addressed. 3. Strictly Control Operating Voltage The operating voltage of a parallel capacitor must be strictly controlled within the allowable range. That is, the long-term operating voltage of a parallel capacitor should not exceed 10% of its rated voltage. Excessive operating voltage will significantly shorten the capacitor's lifespan. As the operating voltage increases, the dielectric loss of the parallel capacitor will increase, causing the capacitor temperature to rise and accelerating the aging of the capacitor insulation, resulting in premature aging, breakdown, and damage. Furthermore, under excessively high operating voltage, the internal insulation of the capacitor will undergo localized aging; the higher the voltage, the faster the aging and the shorter the lifespan. If the long-term operating voltage of a parallel capacitor exceeds its rated voltage by 20%, its lifespan will be approximately 0.3 times that under normal conditions. Therefore, the rated voltage should be reasonably selected based on the actual operating voltage of the local power grid, ensuring that the long-term operating voltage does not exceed 1.1 times the rated voltage of the capacitor. Of course, an excessively low operating voltage is also highly detrimental, as the reactive power output of the parallel capacitor is proportional to the square of its operating voltage. If the operating voltage is too low, the reactive power output of the capacitor will decrease, making it unable to fulfill its reactive power compensation function and negating the intended purpose of installing the parallel compensation capacitor. Therefore, in actual operation, it is essential to maintain the operating voltage of the parallel capacitor at 95%–105% of its rated voltage, and the maximum operating voltage should not exceed 110% of its rated voltage. 4. Harmonic Prevention Many harmonic sources exist in the power grid. If the harmonics are too high at the point where the parallel capacitor is installed, directly connecting the parallel capacitor will often amplify the harmonics in the power grid, posing a significant threat to the safety of the parallel capacitor. Installing series reactors can effectively suppress harmonic components and inrush currents, significantly ensuring the safe operation of the parallel capacitor. Where possible, harmonic components at the installation location of the parallel capacitor should be tested beforehand, and the required capacity of the series reactor should be determined based on the test results. The capacity of the series reactor can also be directly determined based on the capacity of the installed parallel capacitor. Generally, for harmonics of the 5th order and above, 6% of the parallel capacitor capacity should be selected, while for harmonics of the 3rd order and above, 12% of the parallel capacitor capacity should be selected. Furthermore, in locations where only the suppression of harmonics of the 5th order and above is considered (i.e., the reactor capacity is 6% of the capacitor capacity), attention should also be paid to preventing the amplification of the 3rd harmonic to ensure the safe operation of the parallel capacitor. 5. Correct Selection of Switches When disconnecting the parallel capacitor, the arcing between the stationary and moving contacts of the switch will cause operational overvoltage. Besides requiring the capacity of the switch to be approximately 35% larger than the capacity of the parallel capacitor bank, it must also be a circuit breaker with high contact insulation recovery strength, low arc reignition, and good arc extinguishing performance. 6. Install Fuse Protection Each individual capacitor should be protected by a fuse. The rated current of the fuse must not exceed 1.3 times the rated current of the protected capacitor. This prevents a cluster explosion caused by the failure of one capacitor to be tripped in time. 7. Prompt Handling of Abnormal Operating Conditions If abnormal conditions such as bulging, overheating of joints, or severe oil leakage are found in parallel capacitors during operation, they must be taken out of service. In the event of serious accidents such as oil spraying, fire, or explosion, power should be immediately cut off for inspection. Only after the cause of the accident has been identified and addressed can a new capacitor be installed for continued operation.