High-Voltage Insulation Resistance Tester (5kV / 10kV Megohmmeter) for Substation & Transformer Diagnostics
This high-voltage digital insulation resistance tester is engineered for quantitative evaluation of dielectric integrity in high-capacity power transformers, high-voltage cables, and electrical switchgear. Operating at selectable test voltages up to 5kV and 10kV, the instrument measures insulation resistance up to 20TΩ with high short-circuit output current. Designed for field maintenance teams and utility testing laboratories, it delivers stable diagnostic metrics—including Polarization Index (PI) and Dielectric Absorption Ratio (DAR)—under severe electromagnetic interference environments.
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5kV Common Insulation Resistance TesterIn order to meet the intelligence of insulation resistance measurement, our company has recently developed an insulation resistance tester, namely the professional 5kv ir tester also known as 5000v -
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10kV Common Insulation Resistance TesterJH3128 high voltage insulation resistance tester is a professional intelligent testing device dedicated to industrial electrical insulation test, integrating the performance of a high-performance hv -
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5kV Digital Insulation Resistance TesterThe dc insulation resistance tester is a professional device for insulation resistance test, and this 5kv digital insulation tester only uses a 5-inch large screen display, uses high-precision ADC to -
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10kV Insulation Resistance Tester with BatteryJH3302 is a high-performance 10kv insulation resistance tester and professional ir tester, a digital insulation resistance tester equipped with a 5-inch large screen, adopting high-precision ADC for
We operate dedicated production lines for high-voltage electrical test instruments, housing complete SMT placement facilities, automated transformer winding stations, high-voltage DC generator test benches, and precision calibration platforms. Every unit undergoes a mandatory 48-hour electrical burn-in, thermal stability screening, and individual metrological verification prior to dispatch. Direct manufacturing infrastructure enables flexible batch production, strict quality control consistency, and comprehensive technical support for global distributors and industrial clients.
Product Types
5kV Digital Insulation Resistance Tester (JH3128 Series)
Outputs selectable test voltages of 250V, 500V, 1000V, 2500V, and 5000V; measures resistance up to 5TΩ; equipped with a 3mA to 5mA short-circuit current for fast capacitive load charging.
10kV High-Range Insulation Resistance Tester (JH3302 Series)
Generates test voltages up to 10,000V with a measurement range reaching 10TΩ or 20TΩ; built for heavy-duty testing of high-voltage power transformers and long-span transmission cables.
Battery-Powered Field Diagnostic Model
Integrated with a high-capacity rechargeable lithium-ion power pack supporting over 6 hours of continuous field testing, paired with an intelligent rapid charging circuit.
Technical Specifications
| Parameter | Specification Details |
| Parameter | 250V, 500V, 1000V, 2500V, 5000V, 10000V (Model dependent; step-adjustable) |
| Test Voltages | 0.01MΩ to 20TΩ (Automatic range switching) |
| Resistance Measurement Range | 3mA to 5mA (Fast charging for large capacitive loads) |
| Short-Circuit Current | Plus/minus (5% + 10V) across full range |
| Voltage Measurement Accuracy | Plus/minus 3% rdg plus/minus 2 dgt (up to 1TΩ); plus/minus 10% rdg (>1TΩ) |
| Resistance Accuracy | Polarization Index (PI), Dielectric Absorption Ratio (DAR), Step Voltage (SV) |
| Automated Diagnostic Functions | Rejects up to 2mA of induced AC interference current in live switchyards |
| Interference Immunity | 5-inch industrial color LCD screen with backlight and real-time trend graphing |
| Display Interface | Dual power mode: Rechargeable Li-ion battery pack (16.8V) & AC 100V to 240V mains input |
| Power Supply | Temperature: -10°C to 50°C; Relative Humidity: 20% to 90% RH (non-condensing) |
| Operating Environment | IEC 61010-1, CAT IV 600V / CAT III 1000V overvoltage protection |
Key Features
High-Precision ADC Sampling: Integrates high-resolution analog-to-digital converters to eliminate low-current measurement drift in humid or contaminated outdoor environments.
Strong EMI Suppression: Advanced digital filtering algorithms allow accurate testing inside active 500kV substations without reading fluctuations caused by electromagnetic induction.
Automated Mathematical Calculations: Internal microprocessors automatically compute and display Polarization Index (PI) and Dielectric Absorption Ratio (DAR) without manual stopwatch intervention.
Live Voltage Detection: Automatically detects external voltage on terminals exceeding 30V AC/DC and inhibits test execution to protect internal circuitry and operator safety.
Data Storage & Transfer: Internal memory records up to 1,000 test sets, transferable via USB port or wireless interface for generation of compliance reports.
Test Applications
Power Transformer Diagnostic Testing: Evaluates winding-to-ground and inter-winding insulation resistance on power and distribution transformers during commissioning and routine overhauls.
High-Voltage Cable Insulation Assessment: Verifies dielectric health on cross-linked polyethylene (XLPE) and paper-insulated lead-covered power cables prior to high-potential (hipot) testing.
Rotating Electrical Machinery: Measures insulation resistance on stator and rotor windings of large industrial motors and hydro-generators to identify moisture ingress or thermal aging.
Switchgear & Substation Busbars: Tests clearance and creepage insulation integrity across circuit breaker bushings, disconnect switches, and busbar support insulators.
How to Choose the Right Tester
Selecting the correct insulation resistance tester requires matching output voltage parameters to the rated operating voltage of the asset under test:
Shanghai Jwell machinery For Low-to-Medium Voltage Systems (Up to 1kV)
Choose a 1kV or 2.5kV model for control wiring, low-voltage distribution panels, and auxiliary motor circuits.
For Power Transformers (10kV to 110kV classes)
Select a 5kV digital tester to satisfy standard maintenance guidelines without over-stressing solid insulation structures.
Shanghai Jwell machinery For Ultra-High Voltage Assets (220kV and above)
Utilize a 10kV high-range model with extended measuring capability up to 20TΩ and high short-circuit current to rapidly polarize massive capacitive networks.
Component Sourcing: Critical analog front-end components, high-voltage generation transformers, and switching relays are sourced from certified tier-one semiconductor and passive component manufacturers.
Automated Circuit Assembly: Printed circuit boards are populated using high-precision SMT placement machines followed by automated optical inspection (AOI) to eliminate solder bridging and cold joints.
High-Voltage Stress Screening: Assembled high-voltage generation modules undergo 48-hour thermal aging and dielectric stress testing under maximum rated output conditions.
Metrological Calibration: Final instruments are calibrated against primary resistance standards traceable to national metrology institutes, ensuring output voltage linearity and resistance measurement accuracy within tight tolerances.
Customization / OEM
Firmware & Software Localization
Custom user interface languages, tailored boot screens, and brand-specific software naming for regional distribution partners.
Hardware Adaptation
Tailored test lead configurations, specialized heavy-duty transit cases, and customized input terminal layouts for specific utility standards.
Private Labeling
OEM and ODM manufacturing partnerships available for qualified electrical testing equipment brands, supported by dedicated engineering change control and NDA frameworks.
Documentation & Certifications
Calibration Certificates
Each instrument ships with an independent factory calibration report detailing measured versus expected values across all voltage and resistance ranges.
Compliance Documentation
CE certification confirming compliance with European Low Voltage (LVD) and Electromagnetic Compatibility (EMC) directives.
Standard Test Reports
Full technical data packets including electrical schematic summaries, user operating manuals in English, and maintenance guidelines.
Certifications
FAQ
Q: What is the maximum test voltage required for a 110kV power transformer?
A: Industry maintenance standards typically specify a 5kV test voltage for transformers rated up to 110kV. For higher voltage classes or massive core-coil assemblies, 10kV testing is often deployed to reveal subtle insulation degradation.
Q: How does the instrument handle induced AC voltage in active substations?
A: The internal measurement circuit incorporates hardware-level filtering and digital signal processing to filter out induced industrial frequency interference currents up to 2mA, stabilizing the resistance reading.
Q: Can this tester measure Polarization Index (PI) and DAR automatically?
A: Yes. The microprocessor automatically times the 1-minute, 10-minute (for PI), and 30-second, 60-second (for DAR) intervals, calculates the ratio, and displays the final value on the screen.
Q: What is the purpose of a high short-circuit current (3mA to 5mA)?
A: A higher short-circuit current charges large capacitive assets, such as long cables and large transformer windings, to the target test voltage much faster, shortening overall test cycle times.
Q: What power options are available for remote field testing?
A: Units operate on an internal high-capacity rechargeable lithium-ion battery pack supporting over 6 hours of continuous field testing, and can also run directly from standard AC mains power (100V to 240V).
Q: How often should the insulation resistance tester be recalibrated?
A: We recommend annual recalibration to maintain measurement traceability, verified against reference standards in a controlled laboratory environment.
Q: Are custom test leads available for specific terminal configurations?
A: Yes. We supply standard shielded test leads with heavy-duty alligator clips, and can customize specialized probe lengths, hook terminals, or BNC interfaces based on specific procurement requirements.
Q: What warranty terms apply to wholesale and OEM orders?
A: We provide a 12-month standard manufacturing defect warranty covering hardware and calibration stability, backed by responsive engineering support and spare parts availability.
As one of the most experienced insulation resistance tester manufacturers in China, we offer a wide range of products with superior quality. Please feel free to wholesale bulk durable insulation resistance tester from our factory. For price consultation, contact us.
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