North Guang Precision Instrument DJ-50kV Dielectric Strength Tester
| Brand | North Guang Precision Instrument |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | OEM Manufacturer |
| Country of Origin | China |
| Model | DJ-50kV |
| Price | USD 3,500 (FOB Beijing) |
| Input Voltage | AC 220 V, 50 Hz |
| Output Voltage Range | AC/DC 0–50 kV |
| Power Rating | 10 kVA |
| Voltage Accuracy | ≤ ±1% |
| Rise Rate Adjustment | 0.1–5.0 kV/s (programmable) |
| Protection | Overcurrent, Overvoltage, Undervoltage, Short-Circuit, Leakage Current |
| Electrode Set | Two Ø25 mm × 25 mm |
| Test Media | Air or Transformer Oil |
| Response Time for Breakdown Interruption | ≤ 0.05 s |
| Compliance Standards | GB/T 1408.1–2006, ASTM D149, IEC 60243-1 |
Overview
The North Guang Precision Instrument DJ-50kV Dielectric Strength Tester is an engineered solution for determining the dielectric breakdown voltage of solid and liquid insulating materials under controlled AC or DC stress conditions. Based on the principle of controlled voltage ramping until electrical puncture occurs—measured as the peak voltage sustained prior to catastrophic insulation failure—the instrument delivers repeatable, traceable results essential for quality assurance in polymer, rubber, ceramic, composite, and electrical insulation manufacturing. Designed for laboratory and industrial QC environments, it operates within a fully enclosed test chamber with integrated safety interlocks, grounded chassis architecture, and dual-stage protection logic to ensure operator safety at rated 50 kV output. The system supports both short-time breakdown testing and extended-duration withstand evaluation, aligning with standardized test methodologies defined in GB/T 1408.1–2006, ASTM D149, and IEC 60243-1.
Key Features
- Programmable voltage rise rate (0.1–5.0 kV/s), compliant with standard-defined ramp profiles for both AC and DC modes
- Dual-mode operation: AC output directly from high-voltage transformer; DC mode enabled via internal silicon stack and removable shorting rod—no external rectifier required
- Integrated step-motor-driven autotransformer ensures smooth, non-oscillatory voltage regulation with <1% measurement uncertainty
- Real-time analog signal acquisition via precision IC-based sensing circuitry, digitized and transmitted to host PC via shielded industrial interface
- Multi-level hardware protection: overcurrent cutoff (<0.05 s response), overvoltage clamping, loss-of-phase detection, leakage current monitoring, and door-interlocked high-voltage discharge sequence
- Front-panel AC/DC mode selector with synchronized software state validation—prevents mismatched test configuration and erroneous data interpretation
- Configurable test protocols: stepwise ramp, linear ramp, and timed hold (withstand) tests—each with independent parameter storage per user profile
Sample Compatibility & Compliance
The DJ-50kV accommodates flat-sheet, molded, cast, or laminated specimens up to 10 mm thickness using standardized electrode geometries (two 25 mm diameter disc electrodes and one 75 mm diameter electrode per GB/T 1408.1–2006). Testing may be performed in ambient air or dielectric oil immersion to suppress surface flashover and isolate bulk material behavior. All mechanical, electrical, and software subsystems conform to electromagnetic compatibility (EMC) requirements per GB/T 18268.1–2010 and functional safety principles aligned with IEC 61010-1. The embedded firmware implements audit-ready event logging—including timestamped fault triggers, parameter changes, and user logins—to support GLP-compliant documentation workflows. Calibration traceability follows national metrological standards maintained by CNAS-accredited laboratories.
Software & Data Management
The proprietary Windows-based control application provides full test orchestration, real-time voltage/current waveform visualization, and automated pass/fail classification per user-defined criteria. Each test record stores raw acquisition data (voltage, current, time), environmental metadata (ambient temperature, humidity), operator ID, and electrode configuration. Role-based access control allows multi-user deployment: administrators configure system parameters and calibration offsets; technicians execute preloaded test methods; QA reviewers export CSV/PDF reports with digital signatures. Audit trail functionality complies with FDA 21 CFR Part 11 requirements for electronic records—ensuring data integrity, non-repudiation, and version-controlled method updates. Export formats include ISO/IEC 17025–compatible test certificates and raw ASCII datasets for third-party statistical analysis.
Applications
- Evaluation of volume and surface resistivity of polymers, elastomers, and composites per GB/T 1410–2006 and ASTM D257–99
- Quality verification of cable jacketing, transformer bushings, PCB substrates, and encapsulation resins
- R&D screening of nanocomposite dielectrics and high-k ceramics under accelerated aging conditions
- Compliance testing for automotive EV battery module insulation systems per ISO 6469-1
- Characterization of antistatic flooring, ESD-safe footwear, and conductive textiles per GB/T 12703.4–2010
- Dark current assessment of photodetectors and optoelectronic packaging materials
FAQ
What safety interlocks prevent accidental exposure during high-voltage operation?
The test chamber features a mechanically linked door switch that de-energizes the high-voltage circuit upon opening. Simultaneously, the grounding discharge rod must be manually engaged to equalize potential on the HV sphere before specimen handling—verified via front-panel LED status indicators.
How is DC output generated without external rectification?
A high-voltage silicon stack is permanently mounted inside the transformer’s insulated tower. Removing the shorting rod inserts the stack into the output path, producing pulsating DC. Reinsertion restores pure AC output—no recalibration is required.
Can test parameters be saved per operator or material type?
Yes. Up to 100 method templates can be stored locally, each defining rise rate, hold time, voltage limit, and pass/fail thresholds. User accounts enforce password-protected access and modification rights.
Is the instrument suitable for long-term withstand testing beyond 60 seconds?
The thermal design of the 10 kVA transformer and forced-air cooling system support continuous operation at rated voltage for ≥120 seconds, meeting IEC 60243-1 Class II endurance requirements.
Does the software support automated report generation for regulatory submissions?
Yes. Reports include test summary, graphical breakdown curve, statistical deviation metrics, equipment calibration status, and electronic signature fields—all formatted to meet ISO/IEC 17025 and FDA 21 CFR Part 11 documentation standards.
