DC Hipot Tester

DC Hipot Tester: 60 kV to 400 kV Portable ZGF Series for Substation, Cable & Surge Arrester Testing

Shanghai DEMIKS Electric Power Technology Co., LTD (DEMIKS) operates in the Lingang Special Area of the China (Shanghai) Pilot Free Trade Zone. As a specialized high-voltage test equipment supplier, we deliver the 11-model ZGF Series portable dc hipot tester and dc high voltage generator lineup. Output spans 60 kV to 400 kV (2 mA to 10 mA, 120 W to 3000 W) with ≤ 0.5% ripple factor.

60–400 kV 11-Model ZGF Series
≤ 0.5% Ripple Factor
2–10 mA 120 W to 3000 W
1 μA 0.75 UDC1mA Button
Request a Custom ZGF Quote & Sizing Review
DEMIKS ZGF Series Portable DC Hipot Tester 60 kV to 400 kV System
Imported 30-40 kHz IGBT PWM Control Box for ZGF DC High Voltage Generator
Epoxy-Cast Voltage Multiplier Cylinder in High-Strength Aviation Frame
Coaxial-Shielded Digital Microammeter with 1 uA Resolution
0.75 UDC1mA Automatic Surge Arrester Reference Test Function
Portable Aluminum Alloy Suitcase for Substation and Cable Field Testing

  • 60 kV to 400 kV

    Negative DC output voltage tiers cover 60 kV, 120 kV, 200 kV, 300 kV, and 400 kV (120 W to 3000 W).

  • 30–40 kHz IGBT PWM

    Imported 30–40 kHz IGBT PWM control holds ripple factor to ≤ 0.5% with ±(1.0% of reading ± 2 digits) accuracy (±0.5% on ZGF-200kV/5mA).

  • 1 μA & 0.75 UDC1mA

    Coaxial-shielded digital microammeter provides 1 μA resolution and a 0.75 UDC1mA automatic surge arrester reference button (≤ 1.0% accuracy).

  • 9 kg / 5.5 kg + 8.7 kg

    Epoxy-cast voltage multiplier cylinder in high-strength aviation frame and aluminum alloy suitcase weighs 9 kg at 60 kV or 5.5 kg + 8.7 kg at 120-200 kV.

  • MOQ: 1 Unit / 25–45 Days

    Commercial terms include 1 set MOQ (MOQ: 1 unit), 6 hours quote response, 25 days standard delivery (45 days custom), and a 12-month warranty.

  • 8 Countries Export

    Exports cover 8 countries, Brazil, Peru, Argentina, the United States, Canada, Bulgaria, France, and Italy, with on-site installation, commissioning, and operator training.

High-Frequency PWM DC Hipot Architecture: Measuring True Resistive Leakage Without Heavy kVA Transformers

Field substation engineers have a weight problem when testing capacitive apparatus. Conventional AC hipot transformers are bigger and heavier than the breaker being tested, due to 50/60 Hz AC constantly charging capacitance. A portable dc hipot tester solves this problem because direct current drops capacitive current to zero at steady state.

ZGF Series 30-40 kHz IGBT PWM DC Hipot Testing System in Engineering Lab

30–40 kHz IGBT PWM Closed-Loop Regulation vs. Legacy Line-Frequency Rectifiers

Our engineering team builds the ZGF Series dc hipot test set around a 30–40 kHz imported IGBT PWM inverter. Unlike legacy voltage testers with voltage droop, the structural reason ZGF test systems hold stable readings is symmetrical Cockcroft-Walton multiplication (US9160248B2). This modular design buys you a ≤ 0.5% ripple factor, six times tighter than EN IEC 60060-1:2025 (≤ 3%), on 220 V ± 10% (50 Hz ± 1 Hz) power.

Application specialists support your team across our complete Hipot Tester product portfolio and portable hipot tester kits. Every ZGF unit ships from the Lingang Pilot Free Trade Zone, Shanghai, China, with a 25-day lead time and 8 countries of export history. You can request a quote for your specific test voltage and current specification for your field or lab project.

ZGF kV/mA & Capacitive Charging Current Sizing Reference

Account for capacitive charging current during voltage ramp-up. Match your test voltage (60 kV to 400 kV) to the exact DEMIKS ZGF model (120 W to 3000 W).

Review the DEMIKS ZGF kV/mA & Capacitive Charging Specifications

Send Your DUT Capacitance & Test Voltage to DEMIKS Engineering

11-Model ZGF Series DC Hipot Tester Sizing Matrix (60 kV to 400 kV) and Discontinued Legacy Replacement Guide

Procurement teams and NETA contractors face a supply-chain risk when maintaining high-voltage test fleets. Legacy models like the megger dc hipot tester 220000 Series and the hipotronics dc hipot 880PL-A from Haefely Hipotronics and JM Test Systems are discontinued. DEMIKS resolves this gap with 11 active ZGF models from 60 kV to 400 kV (1 set MOQ, 25 days delivery, 1-year warranty).

DEMIKS ZGF & Modular HVDC Product Lineup (14 Concrete Models · 60 kV to 800 kV)

Filter by voltage tier or search by kV, mA, accuracy class (0.5% / 1.0%), or substation application. Every unit includes a 12-month warranty and optional CMA/CNAS calibration report.

ZGF-60kV/2mA Ultra-Light 9 kg Integrated Portable DC Hipot Tester
Verified Field Applications
  • 10–35 kV ZnO Arresters
  • Cable Outer Oversheath
  • MV Switchgear & Motors
Get ZGF-60kV/2mA Quote

ZGF-60kV/2mA

60 kV · 2 mA · 120 W Ripple ≤ 0.5% · 0.75 U1mA Integrated 1-Box (9 kg)

Ultra-Light 9 kg Integrated Portable DC Hipot Tester for MV Switchgear & Cable Jackets

Rated Voltage-60 kV DC
Rated Current2 mA (Max 2.5 mA)
Rated Power120 W
Unit Weight9.0 kg (Single Unit)
Dimensions / Cyl465×390×190 mm | Cyl 440 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)60 kV
Rated Current (mA)2 mA
Output Power (W)120 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight9.0 kg (Integrated)
Primary Substation & Cable Application

10 kV–35 kV ZnO surge arresters, MV switchgear, 60kv dc hipot tester field kits

ZGF-60kV/3mA Medium-Current Integrated 60 kV DC Hipot Generator
Verified Field Applications
  • 35 kV PILC Feeder Cables
  • IEEE 95 Motor/Generator Stators
  • 35 kV MOA Leakage
Get ZGF-60kV/3mA Quote

ZGF-60kV/3mA

60 kV · 3 mA · 180 W Ripple ≤ 0.5% · 0.75 U1mA Integrated 1-Box (9 kg)

Medium-Current Integrated 60 kV DC Hipot Generator for Stator Windings & PILC Cables

Rated Voltage-60 kV DC
Rated Current3 mA (Max 3.75 mA)
Rated Power180 W
Unit Weight9.0 kg (Single Unit)
Dimensions / Cyl465×390×190 mm | Cyl 440 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)60 kV
Rated Current (mA)3 mA
Output Power (W)180 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight9.0 kg (Integrated)
Primary Substation & Cable Application

MV PILC cables, vacuum interrupters, and substation busbar insulation testing

ZGF-60kV/5mA High-Charging 300 W Integrated DC Hipot Tester
Verified Field Applications
  • High-Capacitance MV Cables
  • Hydro/Turbo Generator Stators
  • Electrostatic Power Supply
Get ZGF-60kV/5mA Quote

ZGF-60kV/5mA

60 kV · 5 mA · 300 W Ripple ≤ 0.5% · 0.75 U1mA Integrated 1-Box · High Current

High-Charging 300 W Integrated DC Hipot Tester for Long-Distance Capacitive Cables

Rated Voltage-60 kV DC
Rated Current5 mA (Max 6.25 mA)
Rated Power300 W
Unit Weight9.0 kg (Single Unit)
Dimensions / Cyl465×390×190 mm | Cyl 440 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)60 kV
Rated Current (mA)5 mA
Output Power (W)300 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight9.0 kg (Integrated)
Primary Substation & Cable Application

High-capacitance 15 kV–35 kV feeders and generator stator winding DC withstand

ZGF-60kV/5mA Export English-Panel Integrated 60 kV/5 mA Kit
Verified Field Applications
  • Overseas EPC Commissioning
  • One-Touch 0.75U Arrester Test
  • Mining & Railway Substations
Get ZGF-60kV/5mA Quote

ZGF-60kV/5mA (Export EN)

60 kV · 5 mA · Export EN Direct Load kV · No Divider Export English Aviation Case

Export English-Panel Integrated 60 kV/5 mA Kit with Direct Load Voltmeter & Digital Dial

Rated Voltage-60 kV DC
Rated Current5 mA (1 μA Resolution)
Rated Power300 W
Unit Weight9.0 kg (Aviation Frame)
Dimensions / Cyl465×390×190 mm | Cyl 440 mm
Accuracy Class±(1.0% + 2 digits)
Primary Substation & Cable Application

High-capacitance 15 kV–35 kV feeders and generator stator winding DC withstand

ZGF-120kV/2mA Two-Case Portable 120 kV DC Hipot Tester
Verified Field Applications
  • 35–66 kV ZnO Arresters
  • 66 kV Transformers & Switchgear
  • Single-Tech Field Carry
Get ZGF-120kV/2mA Quote

ZGF-120kV/2mA

120 kV · 2 mA · 240 W Ripple ≤ 0.5% · 0.75 U1mA Split 2-Case (5.5 + 8.7 kg)

Two-Case Portable 120 kV DC Hipot Tester for 35–66 kV Substations & Surge Arresters

Rated Voltage-120 kV DC
Rated Current2 mA (Max 2.5 mA)
Rated Power240 W
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)120 kV
Rated Current (mA)2 mA
Output Power (W)240 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight5.5 kg + 8.7 kg
Primary Substation & Cable Application

35 kV–66 kV gapless ZnO arresters; replacement for discontinued Megger 120 kV sets

ZGF-120kV/3mA 120kv dc hipot tester for 66 kV substation apparatus
Primary Substation & Cable Application

120kv dc hipot tester for 66 kV substation apparatus and cable termination acceptance

Get ZGF-120kV/3mA Quote

ZGF-120kV/3mA

120 kV · 3 mA · 360 W ≤ 0.5% / ±1.0% 5.5 kg + 8.7 kg

120kv dc hipot tester for 66 kV substation apparatus and cable termination acceptance

DEMIKS ModelZGF-120kV/3mA
Rated DC Voltage (kV)120 kV
Rated Current (mA)3 mA
Output Power (W)360 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight5.5 kg + 8.7 kg
Primary Substation & Cable Application

120kv dc hipot tester for 66 kV substation apparatus and cable termination acceptance

ZGF-120kV/5mA 600 W High-Output 120 kV DC Hipot Tester
Verified Field Applications
  • Multi-km 35–66 kV Cables
  • High-Capacitance Busbars
  • Rapid Capacitive Ramp-Up
Get ZGF-120kV/5mA Quote

ZGF-120kV/5mA

120 kV · 5 mA · 600 W Ripple ≤ 0.5% · 0.75 U1mA Split 2-Case · Fast Charging

600 W High-Output 120 kV DC Hipot Tester for Multi-Kilometer 35–66 kV Power Cables

Rated Voltage-120 kV DC
Rated Current5 mA (Max 6.25 mA)
Rated Power600 W
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)120 kV
Rated Current (mA)5 mA
Output Power (W)600 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight5.5 kg + 8.7 kg
Primary Substation & Cable Application

Fast capacitive charging on long 35 kV–69 kV laminated cables and cable oversheaths

ZGF-120kV/5mA Full-Auto Fully Automatic 120 kV/5 mA DC Hipot System
Verified Field Applications
  • Unattended Auto Withstand
  • Zero-Operator-Error Utility QA
  • Automated 0.75U MOA Profiling
Get ZGF-120kV/5mA Quote

ZGF-120kV/5mA (Full-Auto)

120 kV · 5 mA · Full-Auto Nanosecond Sensor Interlock Fully Automatic Boost-Hold

Fully Automatic 120 kV/5 mA DC Hipot System with Unattended Boost → Hold → Discharge

Rated Voltage-120 kV DC
Rated Current5 mA (Auto Regulation)
Rated Power600 W
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Primary Substation & Cable Application

Fast capacitive charging on long 35 kV–69 kV laminated cables and cable oversheaths

ZGF-200kV/2mA Standard 200 kV DC Hipot Tester for 110 kV ZnO Surge Arrester
Verified Field Applications
  • 110 kV ZnO Arrester U1mA
  • 110 kV Bushings & Insulators
  • IEC 60099-4 Field Acceptance
Get ZGF-200kV/2mA Quote

ZGF-200kV/2mA

200 kV · 2 mA · 400 W Ripple ≤ 0.5% · 0.75 U1mA 110 kV Arrester Standard

Standard 200 kV DC Hipot Tester for 110 kV ZnO Surge Arrester U1mA (130–157 kV) Testing

Rated Voltage-200 kV DC
Rated Current2 mA (Max 2.5 mA)
Rated Power400 W
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)200 kV
Rated Current (mA)2 mA
Output Power (W)400 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight5.5 kg + 8.7 kg
Primary Substation & Cable Application

110 kV–138 kV ZnO surge arrester U1mA (130–157 kV) & 0.75 UDC1mA leakage test

ZGF-200kV/3mA 600 W 200 kV DC Hipot Tester for 66 kV XLPE Cable Termination
Verified Field Applications
  • 66 kV Cable Terminations (2–3×U0)
  • 110–138 kV Substation Commissioning
  • 15–60 min Leakage Profiling
Get ZGF-200kV/3mA Quote

ZGF-200kV/3mA

200 kV · 3 mA · 600 W Ripple ≤ 0.5% · 0.75 U1mA 66 kV Cable Termination Spec

600 W 200 kV DC Hipot Tester Specified for 66 kV XLPE Cable Termination & 110 kV Substations

Rated Voltage-200 kV DC
Rated Current3 mA (Max 3.75 mA)
Rated Power600 W
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)200 kV
Rated Current (mA)3 mA
Output Power (W)600 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder Weight5.5 kg + 8.7 kg
Primary Substation & Cable Application

200kv dc hipot tester for 110 kV–145 kV GIS/AIS switchgear and transformer bushings

ZGF-200kV/5mA 0.5% Class High-Precision 200 kV 1000 W DC Hipot Tester
Verified Field Applications
  • ISO/IEC 17025 Calibration Labs
  • 110–220 kV Long Feeder Cables
  • Reference Standard Verification
Get ZGF-200kV/5mA Quote

ZGF-200kV/5mA (0.5% Class)

200 kV · 5 mA · ±0.5% Class Metrology Grade ±0.5% ±0.5% High-Precision Flagship

High-Precision ±0.5% Class 200 kV / 1000 W DC Hipot Tester for Metrology Labs & Long Cables

Rated Voltage-200 kV DC
Rated Current5 mA (Max 6.25 mA)
Rated Power1000 W (1.0 kW)
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±0.5% High-Precision Class
DEMIKS ModelZGF-200kV/5mA
Rated DC Voltage (kV)200 kV
Rated Current (mA)5 mA
Output Power (W)1000 W
Ripple Factor / Accuracy≤ 0.5% / ±0.5% or ±1.0%
Primary Substation & Cable Application (5.5 kg + 8.7 kg)

High-precision lab & 110 kV–220 kV substation acceptance (±0.5% precision tier)

ZGF-300kV/5mA 1500 W Portable 300 kV DC Hipot Tester
Verified Field Applications
  • 220 kV ZnO Surge Arresters
  • 220 kV PILC & Oil-Filled Cables
  • HV Transmission Switchgear
Get ZGF-300kV/5mA Quote

ZGF-300kV/5mA

300 kV · 5 mA · 1500 W Ripple ≤ 0.5% · 0.75 U1mA 220 kV Substation Split Kit

1500 W Portable 300 kV DC Hipot Tester for 220 kV Transmission Substations & Arrester Stacks

Rated Voltage-300 kV DC
Rated Current5 mA (Max 6.25 mA)
Rated Power1500 W (1.5 kW)
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)300 kV
Rated Current (mA)5 mA
Output Power (W)1500 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder WeightSplit High-kV Assembly
Primary Substation & Cable Application

220 kV–230 kV substation surge arresters and HVDC cable commissioning

ZGF-300kV/10mA Heavy-Duty 3000 W 300 kV 10 mA DC Hipot Generator
Verified Field Applications
  • Submarine & Long HVDC Cables
  • Factory Type-Test Production Bays
  • High-Leakage Industrial Loads
Get ZGF-300kV/10mA Quote

ZGF-300kV/10mA

300 kV · 10 mA · 3000 W 10 mA Continuous · 1250 mm Cyl 3000 W Heavy-Duty High Current

Heavy-Duty 3000 W (300 kV / 10 mA) DC Hipot Generator for Submarine Cables & Factory Test Bays

Rated Voltage-300 kV DC
Rated Current10 mA (Max 12.5 mA)
Rated Power3000 W (3.0 kW)
Unit Weight8.5 kg Box + 12.5 kg Cyl
Dimensions / CylReinforced Cylinder: 1250 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)300 kV
Rated Current (mA)10 mA
Output Power (W)3000 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder WeightSplit High-kV Assembly
Primary Substation & Cable Application

Heavy capacitive HVDC feeders requiring 10 mA charging current and 30-min duty cycle

ZGF-400kV/5mA Ultra-High Voltage 400 kV 2000 W DC Hipot Tester
Verified Field Applications
  • 220–500 kV Cable Terminations (CTT)
  • 330–500 kV Substation Arresters
  • EHV Dielectric Research
Get ZGF-400kV/5mA Quote

ZGF-400kV/5mA

400 kV · 5 mA · 2000 W 220–500 kV Termination Spec 400 kV EHV Flagship Kit

Ultra-High Voltage 400 kV / 2000 W DC Hipot Tester for 220 kV–500 kV Cable Terminations

Rated Voltage-400 kV DC
Rated Current5 mA (Max 6.25 mA)
Rated Power2000 W (2.0 kW)
Unit Weight5.5 kg Box + 8.7 kg Cyl
Dimensions / CylCylinder Height: 970 mm
Accuracy Class±(1.0% + 2 digits)
Rated DC Voltage (kV)400 kV
Rated Current (mA)5 mA
Output Power (W)2000 W
Ripple Factor / Accuracy≤ 0.5% / ±1.0%
Control Box + Cylinder WeightSplit High-kV Assembly
Primary Substation & Cable Application

330 kV–400 kV transmission substations and ultra-high-voltage HVDC test systems

HVDC-800kV Modular Series Custom Modular Cylinder-Stacked HVDC Test System
Verified Field Applications
  • HVDC Converter Valves & Bushings
  • IEC 61245 Pollution & Icing Test
  • 500 kV Cable Type-Test Halls
Get HVDC-800kV Quote

HVDC-800kV Modular Series

Up to 800 kV · 500 mA IEC 61245 · Touch HMI + CSV Custom Cylinder-Stacked HVDC

Custom Modular Cylinder-Stacked HVDC Test System (Up to 800 kV / 500 mA) for Labs & Pollution Tests

Rated VoltageUp to ±800 kV DC
Rated Current5 mA – 500 mA (1 A Peak)
Rated PowerCustom kVA Rating
Unit WeightModular Stacked Cylinders
Dimensions / CylIntegrated Divider + Touch HMI
Accuracy Class≤1% Stability | ≤5% Drop
Primary Substation & Cable Application

330 kV–400 kV transmission substations and ultra-high-voltage HVDC test systems

ZnO Surge Arrester 0.75 UDC1mA Testing and High-Side Coaxial-Shielded Microammeter Diagnostics

Substation crews measuring a zno surge arrester dc test as described in IEC 60099-4:2014 and GB/T 11032-2020, run into issues with unshielded meters. Engineers have noted that low-side current return meters pick up air corona and surface creepage, masking the true < 50 μA leakage. DEMIKS solves this by mounting a 1 μA resolution coaxial-shielded digital microammeter (9 V battery, 100 MΩ/0.5 W resistor) at the high-voltage output.

Turning a manual dial for a 0.75 u1ma test causes delay that heats the ZnO blocks and distorts the reading. Because DEMIKS builds a 0.75 UDC1mA automatic surge arrester reference button (≤ 1.0% accuracy) into every ZGF control box, one press drops output voltage to 75% instantly. Read our DC withstand voltage test guide for wiring and discharge rod grounding steps.

ZnO Surge Arrester 0.75 UDC1mA Testing and High-Side Coaxial-Shielded Microammeter Diagnostics
DEMIKS ZGF High-Side Coaxial-Shielded Microammeter & 0.75 UDC1mA Control Box

"Under IEC 60099-4 and GB/T 11032 test rules, a gapless ZnO surge arrester is ramped to 1 mA DC reference voltage (U1mA, within ±5% of baseline). Output voltage then steps down to 0.75 U1mA, where guarded resistive leakage current cannot exceed 50 μA."

Substation High-Voltage Diagnostic Protocol (IEEE Transactions on Power Delivery & MDPI Applied Sciences 2026)

ZnO Surge Arrester U1mA & 0.75 UDC1mA Sizing Advisory

Note a counter-intuitive rule when choosing a high voltage dc hipot tester for 110 kV arresters. A 110 kV AC arrester (Ur = 90-108 kV) has a DC U1mA of 130-157 kV. Thus, a 120 kV unit is incorrect, and a ZGF-200kV/2mA tester is required instead.

Request a Sample 0.75 UDC1mA Arrester Test Report & Quote

IEEE 400 & IEC 60060-1 Dielectric Boundary Matrix: DC Hipot vs. 0.1 Hz VLF vs. AC Withstand Testing

Contractors evaluating vlf vs dc hipot or ac or dc test methods, must align their purchase order with IEEE 400.1-2018 and IEEE 400.2-2024. As demonstrated in the NETA World Journal, applying high direct current voltage to service aged extruded XLPE cables injects trapped space charge into water trees. Thus, a DC dielectric test set is not interchangeable with VLF on aged XLPE cables, and VLF is not a substitute for DC hipot on ZnO arresters or PILC cables.

Substation / Cable Asset (DUT) // 01 Governing Standard: IEC 60099-4 / GB/T 11032

ZnO Surge Arresters (MOA)

Mandated Waveform & Method

Negative DC (U1mA & 0.75 U1mA)

Engineering Rationale & Trade-Off

Isolates nonlinear resistive conduction (≤ 50 μA) without 400+ μA AC capacitive masking.

DEMIKS Equipment Line

ZGF Series DC Hipot Tester (60–400 kV)

ZnO Surge Arresters (MOA) - ZGF Series DC Hipot Tester (60–400 kV)
Substation / Cable Asset (DUT) // 02 Governing Standard: IEEE 400.1-2018 / IEC 60060-1

Paper-Insulated Lead-Covered (PILC) Cables

Mandated Waveform & Method

DC Withstand & Ramp Leakage (3–5× U0)

Engineering Rationale & Trade-Off

Oil-paper insulation dissipates DC charge safely; 9–14.2 kg kit avoids heavy AC trucks.

DEMIKS Equipment Line

ZGF Series DC Hipot Tester (60–300 kV)

Paper-Insulated Lead-Covered (PILC) Cables - ZGF Series DC Hipot Tester (60–300 kV)
Substation / Cable Asset (DUT) // 03 Governing Standard: IEC 60229 / IEC 60840

HV Power Cable Outer Oversheaths

Mandated Waveform & Method

DC Jacket Withstand (10–25 kV DC, 1 min)

Engineering Rationale & Trade-Off

Pinpoints jacket defects and ground connection breaches before moisture corrodes the screen.

DEMIKS Equipment Line

ZGF-60kV/2mA–5mA (9 kg integrated)

HV Power Cable Outer Oversheaths - ZGF-60kV/2mA–5mA (9 kg integrated)
Substation / Cable Asset (DUT) // 04 Governing Standard: IEEE 95 / IEEE 43

Rotating Motor & Generator Stator Windings

Mandated Waveform & Method

Controlled Ramp DC Hipot & Polarization Index

Engineering Rationale & Trade-Off

Non-destructive step-voltage leakage current test reveals contamination and slot degradation.

DEMIKS Equipment Line

ZGF-60kV/3mA–5mA

Rotating Motor & Generator Stator Windings - ZGF-60kV/3mA–5mA
Substation / Cable Asset (DUT) // 05 Governing Standard: IEEE 400.2-2024 / IEC 60502-2

Service-Aged Extruded XLPE / EPR Cables

Mandated Waveform & Method

0.1 Hz Sinusoidal VLF AC Withstand

Engineering Rationale & Trade-Off

Reverses polarity every 5 seconds to detect defects without trapped DC space charge.

DEMIKS Equipment Line

DEMIKS 0.1 Hz VLF Tester

Service-Aged Extruded XLPE / EPR Cables - DEMIKS 0.1 Hz VLF Tester
Substation / Cable Asset (DUT) // 06 Governing Standard: IEC 60060-1 / IEC 62271

GIS, Transformers & Factory Type Testing

Mandated Waveform & Method

50/60 Hz AC Hipot / Series Resonant

Engineering Rationale & Trade-Off

Replicates real RMS alternating current power-frequency electric field across barriers.

DEMIKS Equipment Line

DEMIKS AC Hipot Tester & AC/DC Hipot Tester

GIS, Transformers & Factory Type Testing - DEMIKS AC Hipot Tester & AC/DC Hipot Tester

While your commissioning scope includes both laminated and extruded insulation, our team provides ZGF DC kits along with our 0.1 Hz VLF tester , AC hipot tester , and AC/DC hipot tester units. To familiarize your team with IEEE 400 standards, read our engineering guides on AC vs DC hipot test and VLF vs DC hipot .

IEEE 400 Test Method & Field Crew TCO Benchmark

Check whether your asset requires a dc withstand voltage tester or VLF/AC system. Evaluate annual crew hours saved (1.5 hours per trip) by replacing 65 kg oil tanks with a 9 kg to 14.2 kg dry ZGF kit.

Supplier Qualification, Safety Interlocks, and CMA/CNAS Calibration Verification

EPC and Utility managers assess vendor credentials prior to approving a high potential voltage source for energized substations. Operating a voltage multiplier without a zero-start interlock or discharge rod can expose crews to lethal capacitive energy (1 μF at 100 kV stores 5,000 Joules). DEMIKS builds hardware safety features in every ZGF unit.

Hardware Protection Architecture & Metrology Deliverables

Each DEMIKS ZGF dc hipot test unit completes a 30-minute rated-load thermal run-in and a 10-minute 1.1× rated voltage test before shipping. Every order includes a serial-numbered factory test report (Factory calibration report) and English user manual. We also supply an optional accredited CMA/CNAS third-party calibration report traceable to IEC 60060-1 and DL/T 848.1.

DEMIKS ZGF DC hipot test unit hardware protection architecture and CMA/CNAS calibration verification

  • Hardware zero-start interlock protection prevents high voltage output until the dial returns to zero, thereby avoiding step-voltage shock to the DUT.

  • Digital dial-switch overvoltage protection (±1.0% repeatability) and high/low-voltage dual overcurrent protection cut off IGBT pulses within milliseconds of breakdown.

  • Kits include a discharge rod, shielded output cable, 1 μA resolution coaxial-shielded digital microammeter, and ground terminal for safe operation after testing the insulation.

  • Control boxes and epoxy-cast voltage multiplier cylinders sit inside a high-strength aviation chassis and aluminum alloy suitcase packed in wooden cases for -10 °C to +40 °C environments.

Whether your team is verifying integrity of the insulation on power transformers, switchgear assemblies, or electronic components, our company backs every unit with a 12-month warranty and remote video guidance.

Request a sample serial-numbered CMA/CNAS calibration report and technical specification package

for your vendor qualification review.