The insulation of electrical components deteriorates over time. Insulators are not subjected to mechanical stress but take a beating from natural weathering, thermal variations and electrical stress. After a while, small cracks or water trees may develop. When this happens, the insulator loses its ability to effectively isolate the conductor. This may lead to short circuits and may increase the risk of harm to personnel. That’s why technicians often check for defects on insulators before they get out of hand. That way, the technician can repair the fault or anticipate the replacement of the electrical component.
AC Hipot testing is the common method of finding insulation faults in cables, transformers, motors, switch gears and other electrical components. This test is simple and gives a pass or fail result. An AC hipot tester finds defects by applying a very high voltage to the test sample. Any defect like a crack or water tree will cause current to flow and form an electrical arc.
When choosing a hipot tester, you must consider several factors to ensure you get the most suitable one. These factors will depend on your needs. If you are planning to get a hipot tester, check out the testers from High Voltage Inc. The PFT-301CM and the PFT-303CM are some of the popular models from High Voltage Inc. Both testers provide an output test voltage of 30 kiloVolts. Here is a short breakdown of features of individual hipot testers. This can help you assess which device best suits your needs.
PFT-301CM 30 kV AC High Potential Tester
The PFT-301CM allows you to test for insulation reliability on various electrical apparatuses. This tester is designed to meet the current specifications for testing insulation.
- Variable output voltage up to 30 kV
- Overload protection
- Zero Start and Interlock switches
- Internal voltmeter and ammeter
- Output cable is shielded
- Unibody design
- Durable case that can tolerate rough handling
- Easy to use control interface
- Capacitive load compensation
- 1 kVA for 1 hour, 700 VA continuous
- <5% distortion
- 2% F.S. meter accuracy
- 45 lbs
PFT-303CM 30 kV AC High Potential Tester
For higher power requirements, the PFT-303CM is the suitable tester. It can put out a maximum power output of 3 kVA for 1 hour and 1 k VA continuous. This allows you to test insulation on various medium and high voltage equipment.
- Variable output voltage up to 30 kV
- Overload protection
- Zero Start and Interlock switches
- Internal voltmeter and ammeter
- Output cable is shielded
- Unibody design
- Durable case that can tolerate rough handling
- Easy to use control interface
- Capacitive load compensation
- 3 kVA for 1 hour, 1 kVA continuous
- Draws only 1.5 kVA power during operation
- <5% distortion
- 2% F.S. meter accuracy
- 75 lbs
Selecting the best tester for the desired application allows you to maximize the capabilities of the device. This also means better value for your money. Just imagine getting a high power tester and only using half of its maximum rating. What a waste!
Protec Equipment Resources offers a wide range of electrical test equipment available for rent, lease or sale. Do not hesitate to call us at 1-866-352-5550 if you have any questions.