By hvhipot 
The DC hipot tester under HV Hipot Electric Co., Ltd. can help many power workers conduct various power tests more conveniently.
Test Procedure
1.Preparation
De-energize the equipment and disconnect all wiring.
Discharge any residual energy using grounding sticks.
Clean surfaces to prevent surface leakage.
2.Setup
Connect the hi-pot tester:
HV lead → Device terminal.
Ground lead → Equipment ground.
Place barriers (>30 kV/m clearance).
3.Voltage Ramp-Up
Start at 0 kV.
Increase voltage in 10% steps (e.g., 10 kV → 20 kV → …).
Hold each step for 1 minute to monitor stability.
4.Hold at Test Voltage
Reach target voltage (e.g., 2× operating voltage).
Maintain for 5�C15 minutes (per IEEE 95/IEC standards).
Monitor leakage current continuously:
Pass: Steady/low current (< manufacturer limit).
Fail: Sudden spike or > threshold.
5.Ramp-Down & Discharge
Reduce voltage slowly to 0 kV.
Discharge using grounding sticks for ≥1 minute.
Verify zero voltage with a voltmeter.
Critical Safety Rules
Remote Operation: Control tester from a shielded area.
Dual Grounding: Ground equipment before and after connections.
No Touch Zone: Never contact equipment during testing.
Discharge Capacitors: HIGH RISK! DC systems store lethal energy.
Key Interpretation
Pass: Leakage current stable and within specs.
Fail: Current jumps >20% or fluctuates wildly.
Caution for XLPE Cables: Avoid DC hipot (use VLF AC instead) �C DC can cause insulation damage!
Warning: Only qualified personnel should perform tests. Follow equipment-specific standards (e.g., IEEE 95 for cables). Always prioritize manufacturer guidelines.