Timepower TP673 Dielectric Loss & Volume Resistivity Analyzer
| Brand | Timepower |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Manufacturer |
| Country of Origin | Domestic (China) |
| Model | TP673 |
| Price | Upon Request |
| Measuring Principle | Capacitive bridge-based dielectric dissipation factor (tan δ) and DC volume resistivity measurement |
| Standards Compliance | GB/T 5654, IEC 60247 |
| Temperature Control Range | 0–125 °C |
| Measurement Time (to 90 °C + stabilization) | ≤15 min |
| AC Test Voltage | 500–2200 V (50 Hz, continuously adjustable) |
| DC Test Voltage | 0–500 V (continuously adjustable) |
| Capacitance Range | 5.0–200.0 pF |
| Relative Permittivity (εᵣ) | 1.000–30.000 |
| Dissipation Factor (tan δ) | 0.00001–100 |
| Volume Resistivity (ρᵥ) | 2.5 MΩ·m – 20 TΩ·m |
| Accuracy | Capacitance ±(1% rdg + 0.5 pF) |
| Resolution | Capacitance 0.01 pF |
| Power Supply | AC 220 V ±10%, 50 Hz ±10% |
| Power Consumption | ≤100 W |
| Dimensions | 500 × 360 × 420 mm |
| Weight | 22 kg |
| Environmental Operating Conditions | 0–40 °C, RH ≤75% |
| Safety Protections | Overvoltage, overcurrent, short-circuit, HV indicator, audible/visual alarm |
| Heating Method | Medium-frequency induction heating |
| Interface | RS-232/USB communication port for PC connectivity and real-time data logging |
| Display | Large backlit LCD with Chinese menu navigation |
| Included Accessories | Dielectric oil test cell, calibrated measuring cylinder, shielded test cables, PT100 temperature probe |
Overview
The Timepower TP673 Dielectric Loss & Volume Resistivity Analyzer is an integrated, microprocessor-controlled instrument engineered for precise assessment of insulating oils used in high-voltage electrical equipment. It operates on the principle of precision capacitive bridge measurement combined with regulated DC voltage application to determine two critical aging indicators: the dielectric dissipation factor (tan δ), defined as the tangent of the loss angle between applied AC voltage and resulting current, and the volume resistivity (ρv), calculated as the ratio of DC electric field strength to steady-state current density within the bulk dielectric medium. Designed in strict accordance with GB/T 5654 and IEC 60247 standards, the TP673 delivers metrologically traceable results essential for condition-based maintenance programs in transmission and distribution infrastructure.
Key Features
- Simultaneous or selective measurement of dielectric loss factor (tan δ) and volume resistivity (ρv) under programmable thermal conditions
- Medium-frequency induction heating system enabling rapid, uniform oil temperature ramping from ambient to 90 °C with <±0.5 °C stability—full thermal equilibration and measurement completed in ≤15 minutes
- Integrated digital temperature control with PT100-class probe and closed-loop feedback, supporting continuous monitoring and graphical plotting of tan δ versus temperature via optional PC software
- High-stability AC excitation source (500–2200 V, 50 Hz, continuously adjustable) and independently regulated DC bias (0–500 V) for dual-mode testing
- Large backlit LCD display with intuitive Chinese-language menu interface—no external computer required for routine operation
- Comprehensive safety architecture including hardware interlocks, HV status indication, audible/visual fault alarms, and automatic shutdown on overvoltage, overcurrent, or short-circuit events
- Compact dry-type transformer design ensures low mass (22 kg), reduced electromagnetic emissions, and enhanced portability for field or lab deployment
Sample Compatibility & Compliance
The TP673 is optimized for mineral-based and synthetic insulating oils used in transformers, oil circuit breakers, oil-filled cables, power capacitors, and bushings. Its dedicated dielectric oil test cell (included) conforms to IEC 60247 geometry specifications, ensuring reproducible electrode spacing and guard ring configuration for accurate field distribution. All measurements adhere to standardized test protocols outlined in GB/T 5654 (equivalent to IEC 60247 Ed. 3.0) for dielectric response characterization. The instrument supports GLP-compliant workflows through timestamped result storage, user-accessible calibration logs, and optional audit-trail-enabled software modules compatible with ISO/IEC 17025 laboratory accreditation requirements.
Software & Data Management
Equipped with RS-232 and USB interfaces, the TP673 enables bidirectional communication with Windows-based host systems. The optional Timepower LabSuite software provides real-time acquisition of tan δ, capacitance, εr, and ρv data synchronized with temperature readings. Users can generate dynamic trend plots, export CSV/Excel reports, apply pass/fail thresholds per ASTM D924 or IEEE C57.106, and archive test records with operator ID, sample ID, and environmental metadata. Data integrity is preserved via non-volatile internal memory (retains ≥500 test records) and password-protected configuration settings compliant with basic 21 CFR Part 11 principles for electronic record retention.
Applications
- Condition monitoring of transformer insulating oil during routine maintenance and commissioning tests
- Diagnosis of oxidation, moisture ingress, and sludge formation through progressive increases in tan δ and reductions in ρv
- Quality verification of new oil batches prior to filling equipment
- Research into aging mechanisms of ester-based and silicone fluids under accelerated thermal stress
- Support for failure analysis investigations following dielectric breakdown events
- Compliance testing for utilities operating under national grid codes requiring periodic oil diagnostics
FAQ
Is the TP673 suitable for testing both new and in-service insulating oils?
Yes—the instrument’s wide dynamic range (tan δ: 0.00001–100; ρv: 2.5 MΩ·m to 20 TΩ·m) accommodates highly refined new oils and severely aged samples exhibiting elevated conductivity.
Does the analyzer require external calibration standards?
No—factory calibration is performed using NIST-traceable reference capacitors and resistors. Users may perform verification checks using certified standard oils (e.g., IEC 60247 reference fluids) without recalibration.
Can test parameters be customized for non-standard temperatures or voltages?
Yes—through the instrument’s setup menu, users may define custom test sequences including target temperature setpoints, dwell times, AC/DC voltage levels, and measurement intervals.
What safety certifications does the TP673 hold?
The unit complies with GB 4793.1 (equivalent to IEC 61010-1) for electrical safety in laboratory equipment and incorporates double-insulated HV circuitry with earth-grounding mandatory via chassis terminal.
Is remote firmware update supported?
Firmware updates are delivered via USB flash drive using Timepower’s official utility—no internet connection or cloud dependency is required for version management.
