Insulating Oil Voltage Breakdown Tester

Insulating Oil Voltage Breakdown Tester

Factors affecting the dielectric strength of insulating oil can be categorized into three types: internal characteristics, environmental conditions, and test parameters:

I. Internal Characteristics of the Oil

‌Moisture Content‌

Moisture ionizes to form conductive channels, significantly reducing the breakdown voltage. Experiments show that at 0.03% moisture content, the breakdown voltage decreases by 25%; when moisture reaches 160-180 μL/L, the impact stabilizes.

‌Impurities and Particulates‌

Suspended particles (such as carbides and metal debris) easily form bridging paths in the electric field, leading to partial discharge and breakdown.

‌Degree of Oil Deterioration‌

Oxidation products (such as acids) accelerate the degradation of insulation performance, but compared to moisture and impurities, the direct impact of acid value on dielectric strength is weaker.

II. Environmental Conditions

‌Temperature‌

Pure oil maintains stable breakdown voltage between 20-40°C; beyond 70°C, breakdown occurs due to reduced viscosity accelerating ion collisions.

Oil with impurities exhibits the highest breakdown voltage between 50-70°C; at low temperatures, moisture in an emulsified state more easily forms conductive bridges.

‌Humidity‌

High environmental humidity adsorbs moisture through the oil surface, increasing dissolved water content in the oil.

Insulating Oil Voltage Breakdown Tester

Developed in accordance with national standard GB507-86 and industry standards DL-474·4-92DL/T596-1996, leveraging its advantages through multiple field tests and long-term efforts, this highly accurate, fully digital industrial instrument is easy to operate and aesthetically designed. Thanks to fully automatic digital microcomputer control, it offers high measurement accuracy, strong anti-interference capability, and safety reliability.

The instrument uses a high-capacity microcontroller for stable and reliable operation;

Equipped with a wide-range watchdog circuit to prevent crashes;

Multiple operation options, including GB1986 and GB2002 national standard methods and custom operations, to accommodate various user needs;

The oil cup is made of special glass cast in one piece, eliminating interference such as oil leakage;

Unique high-voltage end sampling design allows test values to directly enter the A/D converter, avoiding errors in analog circuits and ensuring more accurate measurements;

Internal protections against overcurrent, overvoltage, short circuits, etc., with strong anti-interference capability and good electromagnetic compatibility;

Portable structure, easy to move, and convenient for both indoor and outdoor use.

Technical Specifications:

Transformer capacity: 1.5 kVA

Voltage rise speed: 2.0 kV/s, 2.5 kV/s, 3.0 kV/s, 3.5 kV/s (four selectable levels)

Output voltage: 0–100 kV

Power distortion rate: <1%

Display method: Large-screen LCD with Chinese character display

Electrode gap standard: 2.5 mm

Dimensions: 760 mm × 670 mm × 770 mm

Weight: 48 kg

Operating Conditions:

Ambient temperature: 0–40°C

Relative humidity: ≤85%

Power supply: AC 220V ± 10%

Power frequency: 50 ± 5 Hz

Power consumption: <200 W

III. Test Parameters

‌Electrode Type and Gap‌

Differences in electric field distribution between spherical electrodes (IEC standard) and flat plate electrodes (ASTM standard) affect breakdown voltage values.

‌Voltage Rise Rate‌

The standard specifies 2-3 kV/s; excessively fast rates may lead to higher measured breakdown voltages.

‌Standing and Filtration‌

Oil samples not adequately degassed or filtered may yield lower test results due to bubbles or particles.

IV. Other Factors

‌Voltage Waveform‌: Non-standard sine waves may cause abnormal discharges.

‌Chemical Additives‌: Polar additives may alter the dielectric constant of the oil, indirectly affecting insulation strength.

Insulating Oil Voltage Breakdown Tester

This instrument features a three-cup integrated design; LCD display with Chinese menu for user-friendly interaction, equipped with temperature and humidity measurement, and clock display functions;

Simple operation, automatically performing voltage rise, holding, stirring, standing, calculation, data storage, and printout;

Power-off storage function to automatically save test results;

Overvoltage, overcurrent, limit, and ground alarm functions to ensure operator safety;

Unique waveform conditioning function to eliminate harmonic interference for accurate measurement;

Dual control with CPU and PLC to ensure stable and reliable operation;

Self-calibration function to guarantee data accuracy;

High-voltage output end uses a spring-loaded structure to ensure tight contact between the oil cup and high-voltage output;

Program options include GB/T507-1986, GB/T507-2002, and custom programs for flexible selection;

Equipped with RS232 interface and Bluetooth for easy data transfer to computers;

Output voltage: 0–80 kV (0-100 kV settable);

Voltage distortion rate: <1%;

Voltage rise speed: 2.0–3.5 kV/s (Δ = 0.5 kV/s);

Transformer capacity: 1.5 kVA;

Measurement accuracy: ±(2% + 2 digits);

Power supply voltage: AC 220 V ± 10%;

Power frequency: 50 Hz ± 2%;

Power consumption: 200 W;

Operating temperature: 0–45°C;

Operating humidity: <85% RH;

Dimensions (W×H×D): 410×390×375 (mm);

Net weight: ~32 kg.

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