Partial Discharge-Free Test Transformer/Partial Discharge-Free Gas-Insulated Test Transformer - Test Precautions?

Test Precautions for Partial Discharge-Free Gas-Insulated Test Transformers:

I. Core Pre-Test Inspections

1. Confirm Gas Pressure: Check if the pressure of the insulating gas such as SF6 or N₂ inside the transformer is within the rated range. Low pressure will directly lead to a decrease in insulation strength, easily causing internal discharge or breakdown.

2. Ensure Sealing: Observe whether the pressure gauge reading is stable and confirm that there is no gas leakage. Poor sealing will cause the pressure to drop slowly, affecting the stability of the test and potentially drawing in moisture.

3. Reliable Grounding: The equipment casing and grounding terminals must be securely connected to the grounding grid using conductors with sufficient cross-sectional area. The grounding resistance must meet the specifications; this is fundamental to 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.

II. Standardized Control of the Test Process

1. Correct Wiring: Ensure the high-voltage leads are securely connected and maintain sufficient safe distance from the ground and surrounding objects. 1. Control lines and measuring lines (such as voltage divider lines) should be kept away from strong electromagnetic interference sources.

2. Smooth Voltage Increase and Partial Discharge Monitoring: Increase the voltage uniformly from zero, closely observing the instruments. As a partial discharge-free device, the background interference and the actual partial discharge of the test circuit must be monitored throughout the process using the partial discharge detection system. If the partial discharge increases abnormally, even if there is no breakdown, the voltage should be reduced and the machine stopped immediately.

3. Abnormal Handling: If an internal discharge sound is heard or the instrument indication fluctuates abnormally during the voltage increase process, the voltage should be reduced quickly and the power supply disconnected immediately, as this may be a sign of insulation defects.

4. Overvoltage Prevention: After the test, the voltage regulator should be returned to zero uniformly before disconnecting the power supply.

III. Safe Closure After the Test

• After power is cut off, a special discharge rod must be used to thoroughly discharge the test sample and the high-voltage output terminal.

Summary: The core lies in monitoring gas pressure, ensuring sealing, and fully utilizing its partial discharge-free characteristics for real-time monitoring to ensure the validity of the test results and equipment safety. 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 by manufacturers of electrical appliances, cables, motors, transformers, instrument transformers, insulation materials, and related high-voltage components, as well as high-voltage testing laboratories in power, research, and universities. It can perform partial discharge and power frequency withstand voltage tests on their products. This includes SF6 partial discharge-free test transformers, gas-filled partial discharge-free test transformers, partial discharge-free gas-filled test transformers, partial discharge-free test transformer systems, and SF6 insulation high-voltage test transformer systems.