执行标准：武高所起草《35kV及以下交联电力电缆0.1Hz耐压试验方法》
本产品接合了现代数字变频先进技术，采用微机控制，升压、降压、测量、保护完全自动化，并且在自动升压过程中能进行人工干预。由于全电子化，所以体积小重量轻、大屏幕液晶显示，清晰直观、且能显示输出波形、打印机输出试验报告。设计指标完全符合《电力设备专用测试仪器通用技术条件，第4部分：超低频高压发生器通用技术条件》电力行业标准，使用十分方便。现在国内外均采用机械式的办法进行调制和解调产生超低频信号，所以存在正弦波波形不标准，测量误差大，高压部分有火花放电，设备笨重，而且正弦波的二，四象限还需要大功率高压电阻进行放电整形，所以设备的整体功耗较大。本产品均能克服这样一些不足之处。
主要技术特点
- 电流、电压、波形数据均直接通过高压侧采样获得，所以数据真实、准确。
- 过压保护：当输出超过所设定的限压值时，仪器将停机保护，动作时间小于２０毫秒。
- 过流保护：设计为高低压双重保护，高压侧可按设定值进行精确停机保护；
- 低压侧的电流超过额 定电流时将进行停机保护，动作时间都小于２０毫秒。
- 高压输出保护电阻设计在升压体内，所以外面不需另接保护阻。
- 由于采用了高低压闭环负反馈控制电路，所以输出无容升效应。
主要技术参数
- 输出额定电压：参下表
- 输出频率：0.1Hz、0.05Hz、0.02Hz
- 带载能力：参下表 0.1 Hz 最大1.1µF
- 0.05 Hz 最大2.2µF
- 0.02 Hz 最大5.5µF
- 测量精度：3%
- 电压正，负峰值误差：≤3％
- 电压波形失真度：≤5％
- 使用条件：户内、户外；温度：-10℃∽+40℃；
- 湿度：≤85％RH
- 电源：交流50Hz，220V ±5%
电源保险管：参下表
|
型号 |
额定电压 |
带载能力 |
电源保险管 |
重量 |
用途 |
|
GDVLF-30/1.1 |
30kV
（峰值） |
0.1Hz,≤1.1µF |
10A |
控制器：4㎏
升压体：25㎏ |
10kV电缆
发电机 |
|
0.05Hz,≤2.2µF |
|
0.02Hz,≤5.5µF |
|
GDVLF-50/5 |
50kV
（峰值） |
0.1Hz,≤5µF |
55A |
控制器：5㎏
升压体：55㎏ |
用于电缆故障的烧穿 |
|
0.05Hz,≤10µF |
|
0.02Hz,≤25µf |
|
GDVLF-80/1.1 |
80kV
（峰值） |
0.1Hz,≤1.1µF |
30A |
控制器：5㎏
升压体：45㎏ |
35kV电缆
发电机 |
|
0.05Hz,≤2.2µf |
|
0.02Hz,≤5.5µf |
GDVLF 0.1HZ Series of Programmed VLF High-voltage Generator
Introduction
When the instrument like large generator and cable takes the experiment of power frequency and withstand-voltage, large-capacity testing generator or resonance transformer is needed because of the bigger electric capacity. It is difficult for large instruments to take the field experiments. We reduce test frequency as to reduce electric capacity. The experiment found that the effect of 0.1 HZ ELF withstand-voltage experiment equals to that of power frequency and withstand-voltage experiment. It is mainly used in cable current AC experiment, AC experiments of large high-voltage rotating machines and power capacitors.
Features
• Greatly reduced procedure, much easier operation，smaller, lighter
• Full-electronic design and large LCD screen, which is clear and visual. It can also display waveform and print out displayed results.
• Automation of boost, test and protection controlled by microcomputer, and proceed manual intervention during auto-boost.
• Current, voltage, and waveform data all can be directly acquired through high voltage sampling. The data is reliable and accurate.
• Quad-protecting,act promptly(time: ≤20ms), safe and reliable
• Small destructive: compared with normal power frequency and withstand -voltage experiment, 0.1Hz VLF withstand -voltage experiment can not cause bigger destructivity to the insulation, and fobid the harmful polarization charge enter the dielectric
Specifications
• Power supply: AC220V±10%
• Frequency: 50Hz±5%
• Instability of output HV peak: ≤1%
•Instability of ouptut voltage frequency: ≤3%
• Degree of distortion of voltage waveform: ≤5%
• Working condition: temperature: -10℃～+40℃ humidity: ≤85%RH
• Dimention: type VLF-30/1.1 320×170×300(mm3)
京公网安备11010502034458号电子公告服务专项备案
