By hvhipot 
The test transformer is the test equipment of the power equipment inspection and preventive test institute. With the development of my country’s power industry, the requirements for the voltage level of test transformers are getting higher and higher. However, traditional oil-immersed test transformers are increasingly unable to meet the requirements of on-site work in terms of volume, weight and performance. Require. So, what are the precautions for the gas-filled test transformer during and after the test?
1. During the transportation of the equipment, because of the high-pressure gas filled inside, it should be handled with care, especially not to damage the casing.
2. The layout of the test equipment should have a sufficient safety distance around the person. Try to avoid arranging equipment and applying high voltage leads on the personnel aisles.
3. Install fences and hang “stop, high voltage danger” signs on the test site.
4. During the test, the high-voltage leads must have support or traction insulators. Have a safety guard to prevent people from approaching and passing underneath.
5. In the DC high voltage test, when the microammeter is in the high position, in addition to the shielding box, there should be an automatic over-current protection device to prevent sudden breakdown and short-circuit or burnout of the meter during discharge.
6. Power frequency withstand voltage test: Please pay attention to check whether the capacity of the equipment is sufficient, and avoid resonance.
7. The working ground wire (high voltage tail, stabilized capacitor end ground wire) and protective ground wire (operating box shell) should be connected separately and have good grounding performance.
8. During the test, if there is irregular oscillation of the power supply (such as electric welding), it will inevitably affect the stability of the high-voltage output. At this time, the test should be stopped to find out the cause and eliminate it.
9. The climate (temperature, humidity) requirements of the test work should meet the requirements of the test regulations and be recorded.
10. The high-voltage test work must strictly implement the relevant regulations of the safety work regulations issued by the Ministry of Energy.
Maintenance and maintenance:
1. The test transformer should be kept clean regularly. The nylon sleeve should be wiped clean before each test and covered with a plastic cloth.
2. Do not twist the bolts other than the wiring support at will to prevent air leakage caused by the damage of the seal.
3. Slight leakage is a normal phenomenon. It is estimated that the air pressure will decrease by 0.05Mpa every 4 years, and the air pressure at the factory will be between 0.1-0.3Mpa. As the environmental humidity changes, the air pressure slightly increases or decreases. When the air pressure drops to 0.1Mpa, the air should be supplemented.