Forwarding reminder: Transformers that have not changed oil for more than 5 years have a threefold increase in accident risk!

What is the core function of transformer oil?

Insulation function: isolate the winding from air contact and enhance electrical insulation strength

Cooling effect: By circulating heat dissipation, the temperature of the winding and iron core is reduced

Arc extinguishing function: Decomposes and produces gas at high temperatures of the arc, suppressing arc diffusion

Can transformer oil still be used if it turns black? 3 tips to judge and ensure safety

At first glance, the color changes from light yellow to dark brown, indicating severe oxidation

Second smell: burnt smell, sour smell=internal malfunction

Three voltage tests: If it is below 30kV, replace it immediately

How often does transformer oil change? What are the precautions for changing oil?

New equipment: First inspection after 1 year of operation, and if there are no abnormalities, the inspection can be extended to once every 3-5 years;

Aging oil: If the acid value exceeds the standard, there is a lot of oil sludge, and the oil is contaminated after a malfunction, it needs to be replaced immediately.

Notes:

① Thoroughly drain the old oil before changing the oil, and flush the oil tank with qualified new oil (to avoid residual impurities);

② Using vacuum oil injection to prevent the mixing of air and moisture;

③ After oil injection, let it stand for 24 hours (for 500kV and above, let it stand for 48 hours) until all bubbles are completely expelled before putting it into operation.

What tests should be done after changing the oil?

Must undergo pressure testing and chromatographic analysis

5. When does the oil level drop to a certain point and need to be refilled?

Oil must be replenished if it is below 1/4 mark of the oil level gauge.

What should I do if the transformer oil is low? These operations may damage the equipment

Additional oil can be added, but it must be of the same model and qualified

Absolutely prohibited: mixing different manufacturers and brands of oil (such as # 25 and # 45), adding water, and adding other liquids

7. Emergency guide for transformer oil leakage?

Step 1: Immediately cut off power and set up a warning zone

Step 2: Use oil absorbing cotton or activated clay to absorb a small amount of oil leakage, and tighten the leakage bolt; A large amount of oil leakage should be adsorbed or blocked with dry sand and drained to the oil collection pit (water is strictly prohibited)

Step 3: Contact professional maintenance

What should I do if the transformer oil catches fire? This type of fire extinguisher is the most effective

First choice: Carbon dioxide fire extinguisher

Alternative: Dry powder fire extinguisher

Prohibited: foam/water-based fire extinguisher

These 5 types of transformers must undergo oil testing.

Operating for over 5 years

Long term overloaded operation

Those who have been struck by lightning or short circuit impact

Installed in damp/high temperature environments

Abnormal occurrences

What should I do if my skin comes into contact with transformer oil?

Immediately wash with soapy water, it will not cause poisoning but may lead to allergies.