Medium Voltage Testing
MV Cable - VLF Test
Practice a medium-voltage cable VLF setup after the real-world LOTO/live-dead-live hold point: isolated terminations, shield/return control, inactive-phase grounding, and phase-by-phase withstand style readings.
Prep shield, remote end, and inactive phases
Select the VLF set, isolate terminations, bond the shield as the return, and ground/tag inactive phases before applying test voltage.
Current Objective
Prep shield, remote end, and inactive phases
The field setup usually includes barriers, a visible ground/return point, remote-end clearance, and inactive conductors grounded together.
Why
VLF testing is only meaningful when the cable under test is the intended insulation path and everything else is controlled.
Safety
VLF output can be lethal and the cable can hold charge. Follow discharge and grounding procedures after each test.
Tip
If readings are strange, verify the remote end and shield bonds before assuming the cable is failing.
Safety Hold Point
This simulator starts after the real-world LOTO and live-dead-live check. In the field, use the properly rated tester, prove it on a proving unit or known live source, test for absence of voltage, then prove it again before installing test leads.
Loadout
Test Bench
Required Now
Test Set
RequiredCable Prep
RequiredShield / Return
RequiredInactive Phases
RequiredSim Workbench
Lead Placement
Select a lead, then hit the highlighted target nodes.
Expected for Current Step
VLF HV lead: Remote end clear/tagged. Return / shield lead: Cable shield / ground return. Safety ground: Other phases grounded. Lead order is flexible for this check.
Animated Feeder
Pick the phase under test, return on shield/ground, and ground the inactive conductors.
Test set
Cable conductors
Return and grounds
VLF HV lead
Not placed
Return / shield lead
Not placed
Safety ground
Not placed
Step Checklist
Field Intel
Understand why VLF is commonly used for MV cable because it can stress long cable runs without a huge 60 Hz test set.
Connect the HV lead only to the conductor under test and keep inactive conductors grounded.
Use the metallic shield/ground system as the intended return path when the procedure calls for it.
Document remote-end condition, shield bonding, test duration, and any limitations instead of reporting a magic number.
Mistakes Tracked
No mistakes yet. Good simulator runs come from correct setup, lead placement, and sequence discipline.
Readings
Correct the setup, place leads, and run the current step to generate simulated readings.
Profile History
No saved attempts yet. Completed reports show up here and on the simulator landing page.