The selection of a suitable ultra-low frequency high-voltage generator requires comprehensive evaluation from five core dimensions: technical adaptability, portability, safety, intelligence level, and brand service. The specific selection strategy is as follows:
1. Technical adaptability: matching the parameters of the test sample
① Output voltage and frequency
a. Voltage range: It should cover 1.2-1.5 times the rated voltage of the tested object. For example, testing 35kV cables requires selecting 0-50kV equipment, while testing 110kV equipment requires 0-90kV models.
b. Frequency adjustment: Priority support for multi level adjustment of 0.1Hz, 0.05Hz, and 0.02Hz to adapt to different test standards (such as DL/T 849.4, IEEE 400.2).
② Carrying capacity
a. Capacitance matching: Calculate the capacitance based on the length and cross-section of the test sample. For example, to test a 1km 35kV cross-linked polyethylene cable (with a capacitance of approximately 0.15 μ F/km), equipment with a load of ≥ 0.15 μ F at 0.1Hz needs to be selected.
b. Capacity redundancy: It is recommended to choose equipment with a rated capacity 20% higher than the actual demand to avoid slow voltage rise or inability to carry load. For example, testing a 5km cable (with a capacitance of 0.75 μ F) requires selecting a model with a load capacity of ≥ 0.9 μ F at 0.1Hz.
③ Waveform quality
a. Distortion rate control: The waveform distortion rate of high-quality equipment should be ≤ 3%.
b. Multi waveform support: Priority should be given to models that support switching between sine wave and cosine square wave to adapt to different industry requirements (such as the mandatory requirement for cosine square wave in railway systems).
2. Portability: Suitable for complex homework scenarios
① Split design
a. Single piece weight: Controller ≤ 6kg, booster ≤ 25kg, convenient for manual handling.
b. Modular structure: supports quick disassembly and assembly, transportation volume ≤ 0.5m ³, meets civil aviation consignment standards.
② Environmental adaptability
a. Temperature range: Supports wide temperature range operation from -40 ℃ to 70 ℃, suitable for extreme environments such as the Arctic and desert.
b. Protection level: The shell should have IP65 protection, dust and moisture resistance, and be suitable for rainy and dusty conditions. For example, the Huasheng FS-VLF series has been running continuously for 12 months without any faults in high humidity environments in Hainan.
3. Security: Multiple protection mechanisms
① Electrical protection
a. Overvoltage protection: Action time ≤ 20ms, stop immediately when the output exceeds 10% of the set value.
b. Overcurrent protection: Dual protection on both the high and low voltage sides, cutting off the power supply within 0.03 seconds when the current exceeds the limit.
c. Grounding detection: Real time monitoring of grounding resistance, automatic shutdown in case of abnormalities.
② Mechanical safety
a. Anti dumping structure: designed with a low center of gravity, automatically locks when the tilt angle is ≤ 30 °.
b. Emergency stop button: equipped with a red mushroom head emergency stop button, the operator can instantly cut off the high voltage.
4. Intelligence level: Improve operational efficiency
① Automation function
a. One click operation: supports automatic boosting, timing, and lowering, reducing human intervention. For example, Wuhan ultra-high voltage equipment can preset test parameters, and beginners can get started in half an hour.
b. Data management: Built in USB interface, supporting automatic generation and export of test reports, reducing data organization time by 80%.
② Remote support
a. IoT collaboration: By directly connecting to the enterprise security platform through 5G, multi device collaborative detection and cloud analysis can be achieved.
b. Video teaching: The manufacturer provides a video library for operation, covering over 90% of common problems.
The ZC-524B ultra-low frequency and high voltage generator combines modern digital frequency conversion advanced technology and adopts microcomputer control. The boosting, lowering, measurement, and protection are fully automated, and manual intervention can be performed during the automatic boosting process. Due to its full electronic design, it has a small size, light weight, large screen LCD display, clear and intuitive display, and a printer that outputs test reports. The design indicators fully comply with the standards of the power industry and are very convenient to use.
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com
