The steps for writing a transformer preventive test operation ticket are as follows:

1. Make it clear that the purpose of the test is to prevent transformer failure and ensure the safe operation of the power system.

2. List the required test equipment, including test instruments, tools, safety protection equipment, etc.

3. Develop a test plan, including test items, methods, steps and safety measures.

4. Operate according to the test plan, paying attention to the correct operating sequence and precautions.

5. Record the test data and analyze the results to determine whether the transformer meets the operating requirements.

6. Organize the test site, inventory tools and equipment, and ensure site safety.

7. Write a test report, summarize and evaluate the test results, and make suggestions for improvement.

The above are the steps for writing a transformer preventive test operation ticket. I hope it can help you.