Tank Pressure/ Tightness Test of Transformer

 Purpose: 

The leakage test aims to validate the integrity of the transformer's tank by ensuring that it does not have any leaks. This is critical for preventing potential hazards, such as oil spills or electrical malfunctions, which could result from leaks in the transformer's insulation system.

Scope:

The leakage test procedure outlined in this document is specifically designed for use in the Transformer Testing Lab. It ensures consistency and standardization in testing practices within the facility.

Reference:

The test procedure is based on established industry standards and specifications, including IEC 60076-1: This standard provides general requirements and guidance for power transformers, including testing methods.

DDS: 84:2020: This document contains specifications for 11/0.415KV Oil-Immersed Transformers, including testing requirements.

Equipment:

• The necessary equipment for conducting the leakage test includes The transformer under test.
• Dry nitrogen gas for pressurization.
• A pressure gauge kit for measuring pressure.
• A stopwatch for recording the duration of pressure application.

Operating Range:

The pressure gauge kit used in the test operates within the range of 0-60 PSI, providing sufficient coverage for the expected pressure levels during testing.

Operational Steps:

• Detailed operational steps include: Removing the oil filling gauge plug and attaching the pressure gauge kit to the designated hole on the transformer's top plate.

• Connecting the nitrogen gas cylinder to the pressure gauge to supply the required pressure.

• Applying a pressure of 15 PSI to the transformer for 15 minutes, while closely monitoring the time with a stopwatch.

• Ensuring that the rate of pressure application does not exceed 2-3 PSI per second to prevent sudden spikes in pressure.

• Inspecting the transformer's body for any signs of oil leakage during the test.

• Concluding that the transformer passes the test if no leakage is observed and the pressure remains stable at 15 PSI.

Precautions:

• Safety precautions are essential to ensure the well-being of personnel and the integrity of the testing process. These precautions include:
• Wearing protective gloves while handling equipment to minimize the risk of injury.
• Restricting access to the testing area to authorized personnel only to maintain a controlled environment.
• Verifying that there are no existing leaks in the transformer before initiating the test to prevent potential accidents or damage.