Partial Discharge Test Transformer | Test Precautions?

Partial Discharge-Free Test Transformer/Partial Discharge-Free Gas-Insulated Test Transformer - Test Precautions? Core Test Precautions for Partial Discharge-Free Gas-Insulated Test Transformers:

I. Core Pre-Test Inspections

1. Confirm Gas Pressure: The primary inspection item is the pressure of the insulating gas such as SF₆ or N₂ inside the transformer. It must be strictly maintained within the manufacturer's specified rated value range. Insufficient pressure will directly lead to a decrease in insulation strength, potentially causing internal discharge or breakdown.

2. Ensure Sealing: Observe whether the pressure gauge reading is stable and confirm that there are no signs of gas leakage in the equipment and at each interface. Poor sealing will cause the pressure to drop slowly, not only affecting the stability of the test but also potentially allowing moisture to infiltrate and contaminate the internal insulation.

3. Reliable Grounding: The equipment casing and grounding terminals must be securely connected to the field grounding grid using conductors with sufficient cross-sectional area to ensure qualified grounding resistance, which is the foundation for ensuring personal and equipment safety.

4. Cleanliness and Environment: Keep the equipment casing, especially the surface of the high-voltage bushings, clean and dry to prevent surface flashover caused by surface dirt or condensation, which could interfere with partial discharge measurements.

II. Standardized Control of the Test Process

1. Correct Wiring and Shielding: High-voltage leads must be securely connected and maintain a sufficient safe distance from ground. Crucially, the coupling capacitors and measuring lines of the partial discharge detector must be connected using shielded cables and properly grounded to effectively reduce background interference.

2. Pre-test and Formal Test: Before the formal voltage increase, conduct a brief pre-test at a voltage slightly higher than the test voltage to observe the background interference level of the partial discharge detector and confirm system stability.

3. Synchronous Monitoring of Partial Discharge: As a core advantage of partial discharge-free equipment, synchronous monitoring using the partial discharge detection system is essential throughout the process. During uniform voltage increase, if an abnormal increase in partial discharge is detected, even without breakdown, the voltage should be immediately reduced and the system shut down to investigate the cause.

4. Abnormal Handling: If abnormal internal discharge sounds are heard or the instrument pointer swings violently during voltage increase, the voltage should be immediately reduced quickly and the power supply disconnected.

III. Safe Post-Test Conclusion

• After the test is completed and power is disconnected, a dedicated discharge rod must be used to thoroughly discharge the test sample and the high-voltage output terminal of the transformer.

In summary, the core aspects lie in gas pressure monitoring, system sealing assurance, and fully utilizing its partial discharge-free characteristics for real-time insulation diagnosis, ensuring the effectiveness and safety of the test. The MS-YDQW partial discharge-free gas-filled test transformer is a power frequency test transformer designed, developed, and manufactured by our company by introducing and absorbing advanced foreign technology. It is widely used in manufacturers of electrical appliances, cables, motors, transformers, instrument transformers, insulation materials, and related high-voltage components, as well as high-voltage laboratories in power, research, and universities, for partial discharge and power frequency withstand voltage tests.

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