Medium Voltage Field measurements
Medium Voltage Field measurements
(OP)
After spending the afternoon doing some troubleshooting low voltage troubleshooting I started wondering about medium voltage troubleshooting. Measuring the input and output voltage was required for what we were doing (at 480V)
On a 4160V system how would a service tech take voltage measurements? Would PT's be installed and voltage measured indirectly? or is there some procedure/equipment that safely allows the measurement of voltage directly.
Please note this question is for general information only.
On a 4160V system how would a service tech take voltage measurements? Would PT's be installed and voltage measured indirectly? or is there some procedure/equipment that safely allows the measurement of voltage directly.
Please note this question is for general information only.





RE: Medium Voltage Field measurements
And, they must be used on 100kV/ft-rated hosticks. Do read the instructions.
Please Do NOT Attempt USE of a NON-POWER-CLASS "accessory probe." They are deadly and have no BIL rating necessary for most all 60Hz AC circuits. These are intended only for things like servicing bug zappers and boiler igniters.
RE: Medium Voltage Field measurements
Would a hotstick like this be suitable for waveform capture with an o-scope?
My lines of thinking regard medium voltage softstarters and VFD's. Cases where it would be desireable to have independent verification of frequency, voltage and waveform. Clearly, a 13.8 kV softstarter is not something that lends itself to casually measure the output voltage on without prep work.
RE: Medium Voltage Field measurements
Voltage dividers for connection to power systems need ANSI-defined Basic Impulse Levels expressed in kV.
(Ehh, generally one per phase)
RE: Medium Voltage Field measurements
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RE: Medium Voltage Field measurements
So far no one here has mentioned a rubber blanket, protective clothing or gloves. This ain't like checking the 110 outlet in your house. Checking this kind of voltage by amatures has made more than one set of widows and orphans.
RE: Medium Voltage Field measurements