AC High Voltage Test Apparatus for GIS | Test Precautions?

AC High Voltage Test Apparatus/High Voltage Resonance Test System for GIS - Test Precautions? The test precautions for the high voltage resonance test system are as follows:

I. Precise Preparation Before the Test

1. Parameter Matching Calculation: Accurately estimate or measure the capacitance of the test sample and calculate the expected resonant frequency. Configure reactor combinations and taps reasonably according to the equipment's rated parameters (voltage, current, capacity) to ensure the system resonant point falls within the operating range.

2. System Inspection and Grounding: Thoroughly inspect the excitation transformer, reactors, voltage dividers, and high-voltage connection components to ensure good insulation and reliable connections. The system must achieve reliable grounding at one point, with sufficient grounding wire cross-sectional area (≥25mm²) and qualified grounding resistance.

3. Safe Distance Confirmation: Check that all high-voltage leads maintain sufficient safe distances to ground and surrounding objects; set up safety barriers if necessary.

II. Precise Control of the Test Process

1. Low Voltage Tuning: The frequency must be slowly adjusted at a low output voltage (usually 10%-20% of the test voltage) to accurately find the resonant point (maximum current, power factor close to 1). 1. Frequency sweeping is strictly prohibited when approaching the test voltage.

2. Smooth Voltage Increase and Monitoring: After locking the resonant point, maintain a stable frequency and smoothly increase the excitation voltage. Monitor the high-voltage side voltage, circuit current, frequency, and other parameters synchronously throughout the process, and pay attention to the equipment's operating sounds.

3. Overvoltage Protection Setting: Correctly set the overvoltage protection value in advance (generally 1.1 times the test voltage) to ensure reliable protection.

4. Abnormal Handling: If flashover or test sample breakdown occurs during the test, the resonant conditions will be disrupted. Although the device has natural current-limiting characteristics, it is still necessary to immediately and quickly reduce the voltage and disconnect the power supply.

III. Post-Test Safety Procedures

• After the test is completed and power is disconnected, a dedicated discharge rod must be used to fully discharge the test sample (especially large-capacity test samples such as cables and GIS) through a resistor, then directly short-circuit and ground it. Only after connecting the grounding wire can the equipment be touched.

Summary: The core of high-voltage resonant testing lies in "matching as a prerequisite, grounding as a guarantee, and tuning as the key." Strict adherence to parameter calculation, low-voltage tuning, full-process monitoring, and safe discharge procedures ensures safe and effective testing. The MSXB-F-8100kVA 500kV high-voltage resonant test system is primarily designed and manufactured for AC withstand voltage testing of 110kV, 220kV, 1000mm² cables, and for testing 110kV, 220kV and below circuit breakers, GIS, PT, CT, and insulators.

It has a wide range of applications and is an ideal withstand voltage testing device for municipal, county, and prefecture-level high-voltage testing departments and power installation and maintenance engineering units.

The device mainly consists of a frequency converter, excitation transformer, reactor, and capacitive voltage divider.

1. AC withstand voltage test for 1000mm², 110kV cable, length 10km, capacitance ≤2.31uF, test frequency 30-300Hz, test voltage 128kV

2. AC withstand voltage test for 1000mm², 220kV cable, length 4km, capacitance ≤0.688uF, test frequency 30-300Hz, test voltage 216kV 3. 220kV and below circuit breakers, GIS (5 bays), PTs, CTs, insulators: test frequency 30-300Hz, test voltage 460kV, test time 1min

4. 110kV and below circuit breakers, GIS (10 bays), PTs, CTs, insulators: test frequency 30-300Hz, test voltage 265kV, test time 1min

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