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Precision Testing
for Power Systems

KVGRID delivers advanced high voltage, transformer, relay, and oil testing solutions trusted by State Grid, Southern Power Grid, PetroChina, Sinopec, and leading power infrastructure providers across China and globally.

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About KVGRID

A trusted name in electrical testing instrumentation, KVGRID is a professional brand specializing in high voltage test equipment and systems for power transmission, distribution, and industrial applications.

Engineered for Reliability

With years of expertise, KVGRID has established itself as a leading manufacturer of high voltage testers, transformer testers, relay protection testers, and transformer oil analysis systems. Our products are designed to meet international standards and ensure the safety and performance of electrical infrastructure.

We serve national power grids, major power generation groups, oil & gas enterprises like PetroChina and Sinopec, and industrial clients across China and beyond. Our equipment is deployed in substations, power plants, and transmission networks to ensure operational integrity.

  • ISO-Certified Manufacturing
  • Trusted by State Grid & Southern Power Grid
  • Comprehensive Testing Portfolio
  • Global Technical Support
KVGRID Testing Equipment

High-voltage testing systems in industrial environment

Our Products

Comprehensive range of precision test equipment for high voltage systems, transformers, relays, circuit breakers, cables, and insulating materials.

Hipot Test Transformer

High-voltage insulation testing for transformers, cables, and switchgear.

  • AC/DC/Impulse options
  • Up to 500kV output
  • Digital control panel
  • Portable & mobile units

DC Hipot Tester

Precision DC high-potential testing for insulation integrity.

  • 0–120kV range
  • Leakage current measurement
  • Auto discharge function
  • Touchscreen interface

VLF Hipot Tester

Very Low Frequency testing for cable and motor insulation.

  • 0.01–0.1 Hz output
  • Compact design
  • Waveform analysis
  • Pass/fail diagnostics

AC Resonant Test System

Efficient high-capacitance testing using resonance principle.

  • Reduced power requirement
  • For GIS, cables, transformers
  • Frequency tuning
  • Automated test sequences

Transformer Oil BDV Tester

Breakdown voltage testing for transformer insulating oil.

  • IEC 60156 compliant
  • 6–80kV range
  • Auto stirring & heating
  • Printable reports

Winding Resistance Tester

Accurate measurement of transformer winding resistance.

  • Micro-ohm resolution
  • 3-phase simultaneous test
  • Demagnetization function
  • Bluetooth data export

Relay Protection Tester

Comprehensive testing of protective relays and schemes.

  • 6 current & 6 voltage outputs
  • Differential, distance, overcurrent
  • GPS-synchronized testing
  • PC software integration

SF6 Gas Purity Analyzer

On-site measurement of SF6 gas quality in GIS and breakers.

  • 0–100% SF6 concentration
  • Moisture & decomposition byproducts
  • Real-time display
  • Rugged field design

Cable Fault Locator

Pinpoint underground cable faults with precision.

  • TDR & arc reflection methods
  • Up to 32km range
  • Touchscreen interface
  • Integrated surge generator

Tan Delta Test Set

Dielectric loss measurement for insulation condition assessment.

  • 0.001% resolution
  • Multi-frequency testing
  • Guard terminal for noise rejection
  • Portable & battery-powered

Earth Resistance Tester

Accurate grounding system evaluation.

  • 3-pole & 4-pole methods
  • Clamp-on option available
  • Interference rejection
  • Data logging

Partial Discharge Inspector

Early detection of insulation defects in HV equipment.

  • UHF & TEV sensors
  • Online monitoring capability
  • Phase-resolved pattern analysis
  • Alarm thresholds
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Why Choose KVGRID?

Certified Quality

All products comply with IEC, GB, and IEEE standards. ISO-certified manufacturing ensures reliability and repeatability.

Trusted by Industry Leaders

KVGRID equipment is used by State Grid, Southern Power Grid, PetroChina, Sinopec, and major power generation groups.

Global Support Network

Technical assistance, calibration, and training available worldwide through our partner network and direct support team.

500+
Products
30+
Countries
20+
Years Experience
1000+
Clients

Support & Knowledge

What is a Hipot Test?

Hipot (high potential) testing verifies the insulation integrity of electrical equipment by applying a high voltage between conductive parts and ground.

How often should transformer oil be tested?

Transformer oil should be tested annually or after any fault event. Key tests include BDV, acidity, moisture, and dissolved gas analysis.

Can your relay testers simulate real fault conditions?

Yes, our relay protection testers can simulate various fault types (phase-to-phase, phase-to-ground, etc.) with precise timing and magnitude control.

Do you offer calibration services?

Yes, we provide factory calibration and on-site recalibration services to ensure measurement accuracy and compliance.

Get in Touch

For product inquiries, technical support, or partnership opportunities, visit our official website to contact the KVGRID team.

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