VLF AC Hipot Testers Very Low Frequency HIPOTS Udey Test Kits
VLF AC Hipot Testers : It is well known that DC testing of aged extruded cable such as XLPE and EPR is potentially damaging to the cable insulation causing premature failure of the cable under service conditions.
In addition, DC ?proof? or hipot testing has been found to be ineffective in detecting even serious defects in cables. Since this is the main objective of any hipot test, and due to the negative side effects of DC, VLF wave form testing is now recommended by almost all cable testing standards/guides such as IEEE, CENELEC, VDE, SABS etc. Acceptance or maintenance hipot/proof testing using VLF high voltage sinusoidal AC allows the operator to efficiently detect serious cable insulation defects, before they result in an in-service failure, without affecting those healthy sections of the cable that still have remaining service life.
Machine Feature
- Programmable micro-controller
? Advanced digital frequency technology
? Built-in printer
? Portable
? AC HIPOT testing of cables and electrical apparatus is now easier than before
? UDEY VLF testers are suitable for testing cables, transformers, switchgear, rotating machinery, & other electrical apparatus.
Machine Technical Specification
| Input | 220 ? 5% Volts AC, 50 Hz, single phase. | ||||||
| Output-Voltage AC | 30kV / 50kV / 80kV | ||||||
| Output frequency | 0.1Hz, 0.05Hz, 0.02Hz. | ||||||
| Stability of frequency | Fluctuation < 0.5% | ||||||
| Measurement accuracy | ?3%. | ||||||
| Positive and negative voltage peak errors | <3%. | ||||||
| Voltage waveform distortion | <5% | ||||||
| Test Settings | 1) Frequency : 0.1Hz, 0.05Hz, 0.02Hz 2) Timing: 0-99 minutes. 3) Test Voltage: Zero to rated kV. 4) Trip Current: Zero to rated mA. |
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| Protection | 1) Self-check. if condition is abnormal, tester shuts down & displays ?Load unconnected? 2) Mains fuse. 3) Over voltage protection. 4) Over current protection. 5) Protective HV resistor connected inside. |
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| Construction | In two units: Controller and Booster.. | ||||||
| Ambient conditions of use | Temperature Indoor and outdoor : -10 to + 40?C. Humidity:<85% | ||||||
| Model | Output | Load Carring Capacity | Control Unit | Booster | |||
| Dim(cm) | Wt(Kg) | Dim(cm) | Wt(Kg) | ||||
| VL-32 | 30kV/20mA | 0.1Hz<=1.1?F 0.05Hz<=2.2?F 0.02Hz<=5.5?F |
28x37x22 | 5 | 33x18x34 | 25 | |
| VL-53 | 50kV/30mA | 0.1Hz<=1.1?F 0.05Hz<=2.2?F 0.02Hz<=5.5?F |
28x37x22 | 6 | 37x24x39 | 40 | |
| VL-85 | 80kV/50mA | 0.1Hz<=1.1?F 0.05Hz<=2.2?F 0.02Hz<=5.5?F |
28x37x22 | 7 | 33x18x34 37x24x39 |
25 40 |
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Standard Accessories
1) One power supply cord.
2) One interconnecting Cable.
3) One special high voltage cable.
4) One special low voltage cable.
5) One discharge rod.
6) Three Paper rolls.
7) Six fuses.
8) One operating manual.
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