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HF-CH-209 High Voltage Cable Tan Delta Tester
The High Voltage Cable Tan Delta Tester precisely measures dielectric loss factor to evaluate insulation performance of high voltage power cables. It effectively identifies insulation dampness, aging and hidden defects, delivering stable, reliable test results for routine power system maintenance and cable fault diagnosis.
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The High Voltage Cable Tan Delta Tester is a professional dielectric loss measuring device tailored for high-voltage capacitive equipment including power cables, high-voltage motors and bushings. It works with external high-voltage excitation units like test transformers and series resonance devices to finish factory inspection and on-site insulation tests.
Split into a handheld terminal and main test host, the two modules communicate stably via 2.4G wireless signal. It supports both positive and reverse wiring measurement, featuring an ultra-wide current range from 2μA to 15A. Besides, it adapts automatically to variable applied frequencies between 30Hz and 300Hz, delivering precise tan delta readings to spot insulation dampness, aging and hidden faults efficiently for power grid maintenance.
Product Features
The High Voltage Cable Tan Delta Tester is developed for large-capacity and high-voltage capacitive equipment. It conducts dielectric loss tests for factory acceptance tests of high-voltage motors, high-voltage bushings, high-voltage cables and more, when energized by external boosting devices such as high-power test transformers or series resonance systems.
The instrument consists of two parts: a handheld terminal and a main test unit. 2.4G wireless communication is adopted for data transmission between the handheld terminal and mainframe. Both positive and reverse connection testing modes are supported, with an ultra-wide current measuring range of 2μA to 15A available for either mode. It supports adaptive measurement under applied high voltage with variable frequencies ranging from 30Hz to 300Hz.
Product Functions
7-inch industrial-grade capacitive touch color LCD screen
Equipped with a premium capacitive touch 7-inch color liquid crystal display. It features an ultra-large display interface with Chinese menu guidance for all operating steps, making every procedure clear and intuitive.
Ultra-wide current measurement range
Both positive and reverse connection modes support an ultra-wide current measuring range from 20μA to 15A; custom wider current ranges are available upon request.
Ultra-wide frequency coverage
It realizes adaptive measurement with applied high voltage frequencies spanning an extensive range of 30Hz to 300Hz.
Customizable high voltage levels
The applied high voltage can adapt to various high-voltage working scenarios, and voltage specifications can be customized according to customer requirements.
Fiber-optic high-voltage communication
Industrial-grade fiber optic communication modules are deployed between the high-voltage sampling part and low-voltage sampling part of the main tester. This ensures reliable insulation between high and low voltage sides while maximizing the precision of test data.
Independent handheld operation terminal
The handheld terminal is fully electrically isolated from the main test unit via 2.4G wireless communication. Operators can complete all tests solely through the handheld terminal, which greatly guarantees personal safety during testing.
Lithium battery power supply
The handheld terminal, low-voltage section and high-voltage section of the main tester are all powered by lithium batteries. A full charge enables continuous operation for more than 8 hours.
USB flash disk data storage
All internally stored test data can be exported and saved to a USB flash drive via the USB interface.
Technical Parameters
| No. | Item | Specifications |
|---|---|---|
| 1 | Operating Conditions | -15°C ~ 40°C; RH ＜ 80% |
| 2 | Standard Capacitor | tanδ: ＜0.005% Cn: 99.46pF Withstand Voltage: 12kV |
| 3 | Resolution | Dielectric loss tanδ: 0.001% Capacitance Cx: 0.001pF Frequency f: 0.001Hz |
| 4 | Accuracy | Dielectric loss Δtgδ: ±(Reading×1.0% + 0.040%) Capacitance ΔCx: ±(Reading×1.0% + 1.00pF) Frequency Δf: ±(Reading×1.0% + 0.10Hz) |
| 5 | Measuring Range | Dielectric loss tanδ: Unlimited Current I: 20μA ≤ I ≤ 15A High Voltage HV: 1kV ≤ HV ≤ 12kV Frequency f: 30Hz ≤ f ≤ 300Hz |
| 6 | Lithium Battery for Handheld Terminal | 7800mAh lithium battery |
| 7 | Charger | DC 12.6V, 3000mA |
| 8 | Display Mode | 7-inch color LCD screen, 800*480 resolution |
| 9 | Operation Mode | Industrial-grade capacitive touch screen |
| 10 | Handheld Terminal Dimensions (mm) | 270(L) × 160(W) × 65(H) |
| 11 | Main Test Unit Dimensions (mm) | 220(L) × 180(W) × 350(H) |
| 12 | Storage Capacity | 200 groups of test data; USB flash drive data export supported |
| 13 | Weight (Handheld Terminal) | 1.5 kg |
| 14 | Weight (Main Test Unit) | 5.5 kg |
Packing List of High Voltage Cable Tan Delta Tester
| No. | Item Name | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | Main Test Unit | 1 | Set | Built-in lithium battery |
| 2 | Wireless Handheld Terminal | 1 | Pc | 7-inch capacitive touch screen, 2.4G wireless communication |
| 3 | Standard Calibration Capacitor | 1 | Pc | 12kV withstand voltage, for calibration |
| 4 | High Voltage Test Cables & Grounding Wires | 1 | Set | For positive & reverse connection testing |
| 5 | Special Power Charger | 2 | Pc | DC 12.6V 3000mA, for host and handheld terminal |
| 6 | USB Data Export Cable | 1 | Pc | For test data export |
| 7 | User Manual (English & Chinese) | 1 | Book | Complete operation & parameter introduction |
| 8 | Factory Calibration Certificate | 1 | Copy | Industry standard test report |
| 9 | Portable Protective Carrying Case | 1 | Pc | Shockproof and dustproof for full set storage |
FAQ for High Voltage Cable Tan Delta Tester
Q1: What is tan delta testing for high voltage cables, and what does it measure?
A: Tan delta (dissipation factor) test is an offline HV cable insulation diagnostic technology. It detects the phase difference between test voltage and leakage current to measure cable dielectric loss, effectively assessing insulation aging, moisture ingress and internal defects. It is widely used to evaluate cable insulation health and guide equipment maintenance and replacement.
Q2: What types of cables is this tester suitable for?
A: This tester is suitable for routine testing and fault diagnosis of 10kV, 35kV, 110kV and other medium/high-voltage power cables, including XLPE, PVC and rubber insulated cables. It complies with the IEEE 400.2 industry standard for power grid and industrial cable detection.
Q3: What is the difference between VLF tan delta test and power frequency tan delta test?
A: 0.1Hz VLF tan delta test is the mainstream for HV cables. It features low power consumption, no insulation overheating damage, and high sensitivity to water tree and subtle aging defects. Power frequency (50/60Hz) test is not applicable for long HV cables due to large capacitive load and high power demand, only for short electrical equipment.
Q4: What are the qualified standard values for cable tan delta test results?
A: Per IEEE 400.2 standard: ① Excellent: Tan δ < 5×10⁻³, tip-up value (Δtan δ) < 4×10⁻³; ② Normal: Tan δ = 5×10⁻³ ~ 15×10⁻³; ③ Unqualified: Tan δ > 15×10⁻³ or obvious rising tip-up trend, indicating severe insulation aging, moisture or hidden defects.
Q5: What is tan delta tip-up value, and why is it important?
A: Tip-up value refers to the tan delta change when test voltage rises from U₀ to 2U₀. A stable, low-fluctuation value means uniform and healthy insulation. A sharp increase indicates hidden faults like water trees, micro-cracks and partial discharge, serving as a key indicator for potential insulation risks.
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