I just read IEC 63026 and can't find any reference to VLF withstand testing nor using VLF for TD and PD testing. Am I missing it or did they exclude it in the 2019 version?
Using a Motor Test Set with many reduced voltage taps. Utility worried about inrush on a 5000 HP, 12470V motor. Since we will be starting at lower voltages and working up, there will be no full v online starting currents. When will my max current occur? Need they worry?
Can anyone recommend a book or other materials to teach the design of oil insulated high voltage capacitors used in charge/discharge applications like thumpers/cable testers, energy pulse supplies, etc. Typical ratings are 10-20 kVdc @ 500J - 2000J.
Looking for company/consultant with design experience in high voltage AC supplies, particularly transformer design for low PD output. Also, bushing design for the same.
Any Siemens people out there to help? I am trying to find out the capacitance of a large HV motor so that we can size the power required from and AC hipot to perform overvoltage testing. I have the nameplate data.
Can anyone recommend one or more books for the design of high voltage, oil immersed transformers, particularly the design and processing steps necessary for low pd output.
Thank you.
Finding the right AC hipot needed to apply the voltage in easy, but what vendors supply a reasonably priced PD measurement device for elevated voltage off-line testing? Same for a Tan Delta device.
Besides attending coil winding shows, which are excellent sources for info, does anyone have any recommendations for education for how to design and fabricate high voltage test equipment transformers, up to maybe 400 kVac @ 1 - 100 kVA?
Is anyone familiar with the High Test Technology products from the UK? They appear to be well made and are attractive and designed similarly to the old Vanguard line.
Hello All,
Does anyone know of a table that shows common motor sizes and the average capacitance from the terminals to ground, particularly for stator windings?
I am aware of the many influences on this and the impracticality of my question, but I just thought I would ask if there is some...
AC Withstand testing 72 kV vacuum sg. The test voltage is 160 kVac (factory or field?) Can someone tell me the expected current draw at that test voltage? We have to purchase >160 kVac hipots but need the kVA rating needed. Thank you.
Some countries cable testing standards for Mining applications call for a "partial breakage" test of the conductor. A 10% breakage, or deterioration must be measurable. What instrument is or can be used for this test? A resistance measurement won't work, using the Ohm Check Concentric Neutral...
Some countries cable testing standards for Mining applications call for a "partial breakage" test of the conductor. A 10% breakage, or deterioration must be measurable. What instrument is or can be used for this test? A resistance measurement won't work, using the Ohm Check Concentric Neutral...
MV Cable Fault Locating & Testing.
Question: When medium voltage cable testing using thumpers or surge generators in mining environments, are there regulations for the maximum joules of energy that can be used to arc the cable fault to help find it? What is commonly used for fault locating and...
To calculate the power required from an AC Dielectric Test Set one must know the capacitance of the load. Simply listing the electrical specs of the machine does not reveal the capacitance to permit the use of A=(2pif)CV to calculate the current required at the test voltage required. Is there...
When designing low PD high voltage transformers, the turn to turn voltage can't be too high and risk shorted or pd noisy turn to turn flaws. Temperature ratings aside for this question, which round and square magnet copper wire coating has the higher dielectric strength to minimize any possible...
