AC Withstand Voltage Tester | Test Precautions?

Withstand Voltage Tester AC Withstand Voltage Tester/Resonance Test Series -- Test Precautions? The general test precautions for the resonance test series (mainly including series resonance, parallel resonance, etc.) are as follows:

I. Core Preparations Before Testing

1. Precise Parameter Matching: Key to Success. The capacitance of the test sample must be accurately estimated or measured, the resonant frequency calculated, and the reactor combination and taps rationally configured to ensure the system resonant point falls within the effective operating range of the device.

2. Comprehensive System Inspection: Check that the excitation transformer, reactor, voltage divider, and other components are in good condition, and that the connecting cables and equalizing rings are not loose or damaged. Confirm that the grounding system is intact.

3. Reliable Single-Point Grounding: The casings of all system components (excitation transformer, reactor, voltage divider) and the common grounding terminal must use a single-point reliable grounding method. The grounding wire should have sufficient cross-sectional area to ensure safety and reduce interference.

II. Precise Control of the Test Process

1. Precise Tuning at Low Voltage: The frequency must be slowly adjusted under low excitation voltage (usually 10% below the test voltage), closely observing changes in output voltage and current to accurately find the resonant point (maximum current, power factor close to 1). Frequency sweeping under high voltage is strictly prohibited.

2. Smooth Voltage Increase and Continuous Monitoring: After locking the resonant point, maintain a constant frequency and smoothly increase the excitation voltage. Closely monitor key parameters such as high-voltage side voltage, loop current, and frequency throughout the test to determine if resonance or detuning has occurred.

3. Utilizing Resonance Characteristics and Emergency Handling: Fully utilize the voltage boost and natural current-limiting characteristics under resonant conditions. If the test sample experiences flashover or breakdown, the resonant conditions are disrupted, and the loop current will automatically decrease. However, operators must immediately and quickly reduce the voltage and urgently 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 capacitor equipment such as cables and GIS) through a resistor before directly short-circuiting to ground to ensure safety.

In summary, the core of resonance testing lies in "precise matching, meticulous tuning, and attentive monitoring." Strictly adhering to the procedures of parameter calculation, low-voltage tuning, smooth voltage boosting, and safe discharge is fundamental to ensuring safe, effective, and labor-saving testing. The MSXB-F-135kVA 108kV resonance testing series is primarily designed for AC withstand voltage tests of 10kV and 35kV cables, 35kV main transformers, and 35kV switches. It has a wide range of applications and is an ideal withstand voltage testing device for municipal, county-level high-voltage testing departments and power installation and maintenance engineering units.

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

AC withstand voltage tests applicable to the following ranges:

1. 1 km of 35kV/300mm² cable, capacitance ≤0.1945uF, test frequency 30-300Hz, test voltage 52kV, test time 60min

2. AC withstand voltage test of 35kV main transformer, capacitance ≤0.015uF, test frequency 45~65Hz, test voltage 75kV, test time 1min

3. 3 km of 110kV/300mm² cable, capacitance ≤1.1265uF, test frequency 30-300Hz 1. AC withstand voltage test for 35kV switches and transformers, test frequency 30-300Hz, test voltage 100kV, test time 1min

2. AC withstand voltage test for 10kV main transformers, capacitance ≤0.015uF, test frequency 45~65Hz, test voltage 28kV, test time 1min

Frequency resonance test system, AC withstand voltage tester, AC resonance test system, resonance test series, frequency conversion AC resonance test device, AC/DC withstand voltage tester, withstand voltage tester, AC withstand voltage testing machine, AC withstand voltage tester