It is necessary to check whether there is oil leakage outside the regulator, whether there is smoke or discharge of parts. Insufficient welding of the voltage stabilizer housing or improper rubber pads may cause the voltage stabilizer to leak oil. If the oil level is too low, the insulation protection will be lost, resulting in discharge between the conductive parts or between the conductive part and the housing, and it will be burnt in severe cases. Stabilizer.
Therefore, the fault should be eliminated and the oil should be added in time to ensure that the oil level is maintained at 1/4-3/4 of the oil standard. For loose parts, poor contact, or even discharge, disconnect the voltage stabilizer drop insurance in time to eliminate hidden dangers.
A normal operating voltage stabilizer will emit a uniform and subtle buzzing sound. When the voltage stabilizer has a different nature of failure, the sound will change. At this time, measures should be taken according to the site conditions to find the cause of the failure.
Check the distribution transformer oil and the dust on the high and low voltage bushings, clean and wipe the oil and dust in time to prevent the pollution from flashing and discharging when the weather is humid or rainy, causing a short circuit between the bushings, high-voltage fuses blown, and the distribution transformer cannot be normal run. I asked the inspectors to clean at least once every February.
Observe the oil color and regularly check the oil temperature, especially when the load changes, the temperature difference is large, and the weather is bad, the number of inspections should be increased. The top oil temperature of the oil-immersed power distribution regulator should not be higher than 95℃. To prevent the winding and oil from deteriorating too quickly, the temperature rise of the top oil should not exceed 45°C frequently.
Measure the insulation resistance of the distribution transformer, check whether the leads are firm, and pay special attention to whether the low-voltage outlet connection is in good contact and whether the temperature is abnormal.
Strengthen the measurement of electricity load. During the peak period of electricity use, strengthen the load measurement of each distribution transformer, increase the number of measurements if necessary, and adjust the distribution voltage stabilizer with the unbalanced three-phase current in time to prevent neutral current Excessive blown leads will cause damage to the user equipment and damage to the distribution transformer.
For the distribution transformer whose connection group is Vyn0, the three-phase load should be balanced as much as possible, and no one-phase or two-phase power supply should be used. The neutral line current should not exceed 25% of the rated current on the low-voltage side and strive to make the distribution transformer not overloaded or partial run.
Regularly check and replace the fuse once or twice. It is strictly forbidden to replace the fuse with aluminum wire. The primary fuse protects the system, and the secondary fuse protects the voltage stabilizer. The fuse selection must be compatible with the capacity of the voltage stabilizer.
It is not allowed to adjust the tap switch privately, in case the tap switch is not adjusted in place and the phase-to-phase short circuit will cause the power distribution regulator to burn out.
Reasonably choose the installation location of the distribution transformer, the installation location should be as close as possible to the load center, and the power supply radius should be controlled within 0.5km. At the same time, try to avoid installing it in areas prone to lightning strikes or low-lying water. Because it is located in the county town, there are many voltage stabilizers at the intersection. In order to reduce the accidents of cars hitting the poles and towers, all the poles along the roadside are pasted with anti-collision strip signs.
Regularly patrol the lines and cut down the line channels to prevent the accidents of low-voltage short-circuit and burn-out of the distribution voltage stabilizer caused by tree branches touching the wires.
Try to avoid installing a low-voltage metering box on the power distribution stabilizer. Due to long-term operation, the metering box glass is damaged or the low-voltage pile head of the distribution transformer is damaged, and the distribution transformer cannot be replaced in time, which causes the power meter to burn out due to rain and other reasons. More than 95% of the public distribution transformers of our institute are installed with JP cabinets, which play a good role in protecting the safe operation of the voltage stabilizer.