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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The OTD-B Precision Insulating Oil Dielectric Loss Tester is a professional, fully integrated test instrument engineered for comprehensive quality and insulation performance assessment of insulating oils used in high-voltage electrical equipment. Designed and manufactured in strict accordance with GB/T 5654-2007, IEC 60247, and ASTM D924 international and domestic standards for liquid insulating materials, it delivers accurate, repeatable measurement of dielectric dissipation factor (tanδ), relative permittivity (εr), and DC resistivity of insulating oils, the core indicators for evaluating oil aging, moisture ingress, contamination, and insulation degradation.
This all-in-one system integrates a standard 3-electrode test cell, high-precision temperature control unit, digital Schering bridge, AC test power supply, SF6 gas-filled standard capacitor, high-resistance meter, and DC high-voltage source. Adopting advanced medium-frequency induction heating technology and full digital intelligent measurement, it eliminates manual operation and human error, ensuring stable and reliable test results. It is the industry-preferred solution for power utilities, transformer manufacturers, industrial maintenance teams, third-party testing institutions, and research laboratories worldwide, suitable for both fixed laboratory quality control and on-site field testing of transformer oil, circuit breaker oil, and other liquid insulating fluids.
Specifications
| Parameter Category | Specification |
| Core Measurement Performance | |
| Model | OTD-B |
| Dielectric Dissipation Factor (tanδ) | Measurement Range: 0.00001 ~ 100 |
| Accuracy: ±(1% of reading + 0.0001) | |
| Resolution: 0.00001 | |
| Capacitance Measurement | Measurement Range: 5pF ~ 200pF |
| Accuracy: ±(1% of reading + 0.5pF) | |
| Resolution: 0.01pF | |
| Relative Permittivity (εr) | Measurement Range: 1.000 ~ 30.000 |
| Accuracy: ±1% of reading | |
| Resolution: 0.001 | |
| DC Resistivity | Measurement Range: 2.5MΩ·m ~ 20TΩ·m |
| Accuracy: ±10% of reading | |
| Test Power Supply | |
| AC Test Voltage | 500V ~ 2200V AC RMS, continuously adjustable |
| Accuracy: ±2% | |
| Rated Capacity: 50VA | |
| DC Test Voltage | 200V ~ 600V DC, continuously adjustable |
| Accuracy: ±2% | |
| Power Supply | AC 220V±10%, 50/60Hz±1% |
| Rated Power Consumption | <600W |
| Temperature Control System | |
| Temperature Control Range | 0℃ ~ 125℃ |
| Temperature Control Accuracy | ±0.5℃ |
| Temperature Resolution | 0.1℃ |
| Heating Method | Medium-frequency induction heating, non-contact |
| Heating Speed | Room temperature to 90℃ in ≤15 minutes |
| Test Cell | |
| Structure | Standard 3-electrode structure, GB/T 5654-2007 compliant |
| Electrode Spacing | 2mm standard |
| Sample Capacity | 40mL |
| Special Features | Built-in oil drainage solenoid valve, anti-cross contamination design |
| Operation & Data Management | |
| Display | Large-screen high-brightness LCD |
| Operation Modes | Fully automatic mode + manual mode |
| Data Storage | 1000+ groups of test records, full traceability |
| Data Export | USB 2.0, Excel format export |
| Printer | Built-in high-speed thermal printer |
| Environmental & Physical Specifications | |
| Operating Temperature | -15℃ ~ +40℃ |
| Storage Temperature | -20℃ ~ +60℃ |
| Operating Humidity | ≤80% RH (non-condensing) |
| Dimensions | 380mm × 320mm × 280mm |
| Net Weight | 18kg |
| Compliance Standards | IEC 60247, ASTM D924, GB/T 5654-2007, IEC 61010, CE |
Applications
Core Test Objects
· Mineral insulating oil for power transformers, distribution transformers, and instrument transformers (CT/PT)
· Insulating oil for high-voltage circuit breakers, switchgears, and GIS equipment
· Synthetic ester insulating oil, natural ester (vegetable-based) insulating oil, and other environmentally friendly insulating fluids
· Capacitor oil, cable oil, and other liquid insulating media used in HV electrical equipment
· New oil incoming inspection, in-service oil routine monitoring, and post-repair oil quality verification
Industry-Specific Usage
· Electric Power Utilities: Routine oil quality monitoring, substation equipment preventive maintenance, and fault diagnosis for transmission and distribution assets
· Transformer & Electrical Equipment Manufacturers: Production line quality control, factory outgoing inspection, and type testing for transformers and HV equipment
· Industrial & Petrochemical Facilities: Insulating oil testing for critical power equipment in high-reliability production plants and hazardous areas
· Rail Transit & Urban Infrastructure: Traction power supply equipment insulating oil testing for metro, high-speed railway, and urban rail transit systems
· Third-Party Testing & Certification Bodies: Compliance testing, performance verification, and arbitration testing of insulating oils
· Research & Academic Institutions: Insulating material research, oil aging performance testing, and high-voltage engineering experimental research
Advantages
Strict Global Standard Full Compliance
Fully designed, calibrated, and tested in accordance with IEC 60247 (Insulating liquids – Determination of dielectric dissipation factor), ASTM D924 (Standard Test Method for Dielectric Dissipation Factor of Electrical Insulating Liquids), and GB/T 5654-2007 international and domestic standards. Test data is globally recognized, meeting the strict requirements of transformer export certification, grid access, and third-party laboratory accreditation.
All-In-One Integrated Test Solution
A single instrument replaces multiple separate test devices, integrating tan delta measurement, relative permittivity test, DC resistivity test, and precision temperature control into one unit. This eliminates repeated sample preparation and wiring, reduces test time by over 50%, lowers equipment investment, and streamlines the entire test workflow.
Unmatched Measurement Accuracy & Stability
Advanced 3-electrode test cell, SF6 standard capacitor, and full digital measurement circuit ensure ultra-high measurement accuracy and long-term stability. It accurately captures minor changes in oil insulation performance caused by aging, moisture, and contamination, providing a definitive basis for oil replacement and equipment maintenance decisions.
Precise & Fast Temperature Control
Medium-frequency induction heating technology and PID intelligent temperature control deliver uniform heating, fast temperature rise, and ±0.5℃ precise temperature control. This ensures test results are measured at standard temperatures (e.g., 20℃, 40℃, 90℃), fully complying with standard test requirements and enabling accurate comparison between different samples and test cycles.
Fully Automated Unattended Operation
One-click fully automatic test workflow covers the entire process from temperature control to data calculation and report generation. This eliminates manual operation and human error, drastically reduces labor costs, and significantly improves test efficiency for batch sample testing in laboratories and production lines.
Lab & Field Dual-Purpose Design
Compact portable structure and rugged industrial housing make it suitable for both fixed laboratory precision testing and mobile on-site field maintenance. Wide operating temperature range and anti-interference design ensure stable performance in harsh outdoor substation environments, with no need for a dedicated test room.
Low Total Cost of Ownership
Industrial-grade components ensure long service life with minimal maintenance costs. Integrated design eliminates the need for additional test equipment, reducing upfront investment. Accurate oil quality assessment helps users optimize oil replacement cycles, extend equipment service life, and avoid costly unplanned outages.
FAQ
Q: What international standards does the OTD-B comply with?
A: The tester is fully designed, calibrated, and tested in accordance with IEC 60247 (Insulating liquids – Determination of dielectric dissipation factor), ASTM D924, and GB/T 5654-2007 international and domestic standards. Test data is globally recognized for oil quality certification and compliance reporting.
Q: What parameters can the OTD-B measure?
A: It can simultaneously measure dielectric dissipation factor (tanδ), AC capacitance, relative permittivity (εr), and DC resistivity of insulating oils in a single test setup, covering all key indicators for insulating oil quality assessment.
Q: What types of insulating oils can it test?
A: It is suitable for all types of liquid insulating media, including mineral insulating oil for transformers and circuit breakers, synthetic ester oil, natural ester (vegetable-based) insulating oil, capacitor oil, and cable oil.
Q: Is the test cell compliant with international standards?
A: Yes. The test cell adopts a 3-electrode structure fully compliant with GB/T 5654-2007 and IEC 60247 standards, with 2mm standard electrode spacing, eliminating the influence of stray capacitance and leakage current on test results.
Q: How accurate is the temperature control?
A: The temperature control range is 0~125℃, with a control accuracy of ±0.5℃ and 0.1℃ resolution. It adopts medium-frequency induction heating technology, with fast heating speed and uniform temperature distribution.
