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Product Details:
Payment & Shipping Terms:
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Usage: | Very Low Frequency Voltage Withstand Test | Appliaction: | Diagnosing Stator End Insulation Defects |
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Max. Voltage: | 60KV (80KV Can Be Ordered) | Output Frequency: | 0.1Hz, 0.05Hz, 0.02Hz |
Test Accuracy: | 3% | Voltage Wave Form Distortion: | ≤ 5% |
Output Waveform: | Sine Wave | Power Supply: | AC50Hz, 220V ±5% |
High Light: | high voltage insulation tester,high voltage testing machine |
Very Low Frequency Voltage Withstand Test Set For Generator , Diagnosing Stator End Insulation Defects
I. Product Description and Why select the test device :
In fact, the withstand voltage test with very low frequency is a substitute for withstand voltage test with power frequency. As we all know, it needs a large-capacity test transformer or resonant transformer to do withstand voltage test for large generators due to great capacity in their insulation layer. This huge equipment is not only heavy and expensive but also inconvenient. In order to resolve the problem, the power sector reduces the test frequency to lessen the capacity of test power. From many years of theory and practice at home and abroad show that compared with power frequency, the very low frequency with 0.1Hz has more advantages such as small size, light weight, 1/500 capacity that of power frequency in theory, and easy-operating with the same equivalence. That is why developed countries adopt this approach in general. National Development and Reform Committee has drawn up relative industry standards. China is promoting this approach and this instrument is developed based on the needs. It can be widely used in AC voltage withstand test for cables, and large-scale high-pressure rotary motor.The very low frequency test device can effectively find the insulation defect at the end of the stator than traditional power frequency test method.
II. Technical Features
It performs step-up, step-down, measurement and protection automatically by using computer control with joining modern digital conversion of advanced technology. It not only owns small size, light weight, large-screen liquid crystal display with clear and intuitive but also displays output waveform and prints test reports. It is designed in full compliance with the industry standard, easy to use. Both at home and abroad, there are many disadvantages in current equipment, such as wrong sine waveform, large measurement error, spark discharge, high power consumption and so on.This instrument can overcome these disadvantages. Besides, it has the following features:
III. Optional Model and Test Range
Model | Rated Voltage/current | Load Carrying Capacity |
Power FuseTube |
Product Structure and Weight |
VLF-30 |
30kV/20mA (Peak) |
0.1Hz,≤1.1µF | 5A |
Controller:4㎏ Booster: 25㎏ |
0.05Hz,≤2.2µF | ||||
0.02Hz,≤5.5µF | ||||
VLF-40 |
40kV/20mA (Peak) |
0.1Hz,≤1.1µF | 7A |
Controller:4㎏ Booster:25㎏
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0.05Hz,≤2.2µF | ||||
0.02Hz,≤5.5µF | ||||
VLF-50 |
50kV/30mA (Peak) |
0.1Hz,≤0.5µF | 8A |
Controller:4㎏ Booster:30㎏
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0.05Hz,≤1µF | ||||
0.02Hz,≤2.5µF | ||||
VLF--60 |
60kV/30mA (Peak) |
0.1Hz,≤0.5µF |
8A
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Controller:5㎏ Booster:35㎏
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0.05Hz,≤1µF | ||||
0.02Hz,≤2.5µF | ||||
VLF-80 |
80kV/40mA (Peak) |
0.1Hz,≤0.5µF |
12A |
Controller:6㎏ Booster Grade 1(30kV):25㎏ Booster Grade 2(50kV):50㎏ |
0.05Hz,≤1µF | ||||
0.02Hz,≤2.5µF |
IV. Ground capacitance of single-phase for different generators
· Thermal power generator | Hydro power generator | ||||||
Generator capacity (MW) |
200 | 300 | 600 | 85 | 125-150 | 300 | 400 |
Ground capacitance of single-phase(µF) C | 0.2-0.25 | 0.18-0.26 | 0.31-0.34 | 0.69 | 1.8-1.9 | 1.7-2.5 | 2.0-2.5 |
Note: Utest=√2×1.2×1.5×Un Un = rated voltage of generator
HV test current to tested stator =2πfCUtest
V. Universal Technical Parameters
VI. Schematic and description of the display
P.S. F=Freqency, T=Timing, V=Voltage, I=Current
VII. Test Connection Figure
VIII. Supply List
Contact Person: Sales Manager
Tel: +8613707144739