VLF Series 0.02Hz 30kV, 50kV, 60kV, 80kV Power Cable Very Low Frequency VLF AC Hipot Tester

VLF Series 

0.02Hz 30kV, 50kV, 60kV, 80kV Power Cable Very Low Frequency VLF AC Hipot Tester

VLF-80KV AC Hipot Tester

VLF-40KV AC Hipot Tester

Introduction

• VLF Tester is designed and manufactured for electrical equipment very low frequency withstand voltage test.

• Very low frequency withstand voltage test is essentially an alternative of power frequency withstand voltage test. It is much smaller, lighter and portable than power frequency withstand voltage tester. It is proved home and abroad that 0.1Hz ultra-low frequency withstand voltage test can replace power frequency withstand voltage test.

• It can be applied for 10kV, 35kV, 300MW thermal power machine, 10kV, 35kV power transformer,power cable and other electrical equipment

Specifications

• Max voltage output: refer to following table;

• Output frequency: 0.1Hz, 0.05Hz, 0.02Hz;

• Measurement accuracy: 2.5%;

• Positive and negative voltage peak errors < 2.5%RDG+0.3%FS;

• Voltage wave form distortion:<3%;

• Insulation resistance measurement error:<2.5%;

• Leakage current measurement error:<2.5%;

• Power supply:AC220V ± 10%, 50Hz/60Hz;

• Environment temperature: 0~50°C;

• Humidity:≤85%RH;

• Model	Rated Voltage/current	Load Carrying Capacity	Power fuse wire
  VLF-30KV	30kV/20mA (Peak)	0.1Hz,≤0.5µF~1.1µF	5A
  		0.05Hz,≤0.5µF~2.2µF
  		0.02Hz,≤0.5µF~5.5µF
  VLF-50KV	50kV/30mA (Peak)	0.1Hz,≤0.5µF~1.1µF	7A
  		0.05Hz,≤0.5µF~2.2µF
  		0.02Hz,≤0.5µF~5.5µF
  VLF-60KV	60kV/30mA (Peak)	0.1Hz,≤0.5µF	9A
  		0.05Hz,≤0.5µF~1µF
  		0.02Hz,≤0.5µF~2.5µF
  VLF-80KV	80kV/30mA (Peak)	0.1Hz,≤0.5µF	12A
  		0.05Hz,≤0.5µF~1µF
  		0.02Hz,≤0.5µF~2.5µF

Warning

• When carrying out 10KV cable test, one-phase test is strongly suggested. The voltage shall be 18KV and the frequency shall be 0.1Hz(recommend), 0.05Hz(recommend),0.02H(The boost process is slow), 0.01Hz(The boost process is very slow, 10-40 minutes, suitable for cables over 10 kilometers). The manual mentioned load capacity is the theoretical value, the scene 10KV cable length can reach 3-20 km.

• When carrying out 35KV cable test, one-phase test is strongly suggested. Voltage is set to 60KV (general requirements)-78KV (according to the rules needed) and the frequency is set to 0.1Hz(recommend), 0.05Hz(recommend), 0.02Hz(The boost process is slow) and 0.01Hz(The boost process is very slow, 10-40 minutes, suitable for cables over 10 kilometers). The manual mentioned load capacity is the theoretical value, the scene 35KV cable length can reach 3-15 km.

Features

• Data of current, voltage and wave form can be directly sampled at high voltage side, so the data is real and accurate;

• Over-voltage protection: If the output exceeds the set limit of voltage, the instrument will shut-down to protect itself; the actuation time is less than 15ms;

• Over-current protection: it is high-low voltage dual protection in the design, the accurate shut-down protection can be made according to the set value at high voltage side; If the current on low voltage side exceeds the rated current, the instrument will take shut-down protection, the actuation time are both less than 15ms;

• A high voltage output protective resistor is provided in the voltage boost body in the design and this eliminates the need of additional protective resistor connected outside;

• As a result of high and low voltage closed-loop negative feedback control circuit, the output without capacitive rise effect;

• High-voltage control part adopts innovative light control HV switching unit, control is accurate, safe and reliable;

• With color man-machine interface touch control plus controls modular software operating system, precise and intuitive;

  
  

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