Dielectric Loss Factor and Volume Resistivity Tester for Electrical Insulating Liquids

I. Core Functions and Technical Features

Dual-Parameter Measurement

Dielectric Loss Factor: Reflects the degree of energy loss of insulating oil in an alternating electric field, with a measurement range typically from 0.00001 to 1 and a resolution of up to 10??.

Volume Resistivity: Characterizes the conductive properties of insulating oil, with a range covering 2.5 MΩ·m to 20 TΩ·m (some models extend to 100 TΩ·m).

Key Technologies

Utilizes a three-electrode oil cup design, compliant with the GB/T5654-2007 standard, to eliminate stray capacitance interference.

Integrates medium-frequency induction heating and PID temperature control, with a temperature range from room temperature to 120°C and a control accuracy of ±0.5°C.

Applies signal processing technology to enhance anti-interference capability, with data stability superior to traditional models.

Automated Operation

One-click full-process testing, automatically completing heating, data acquisition, calculation, and storage.

Equipped with a 7-inch touch screen, supporting real-time curve display and historical data export.

II. Typical Application Scenarios

Power Industry: Acceptance testing of new transformer oil and periodic testing of in-service oil.

Research Field: Study of electrical properties of insulating materials, such as critical conductive characteristics analysis.

Quality Control: Performance evaluation of industrial insulating media, such as fire-resistant oil and cable oil.

III. Safety and Standards

Safety Mechanisms: Power-off protection when the cover is opened, high and low voltage short-circuit alarms.

Compliance Standards: GB/T5654-2007, IEC 60247-200426.

Dielectric Loss Factor and Volume Resistivity Tester for Electrical Insulating Liquids

I. Pre-Operation Preparation

Equipment Inspection

Ensure reliable grounding of the instrument (grounding resistance ≤4Ω), with a power supply of AC220V±10%.

Check the cleanliness of the oil cup; the empty cup capacitance should be 60±2pF, and the empty cup dielectric loss should be <0.005%.

Sample Handling

Oil samples must be filtered to remove impurities and allowed to stand to eliminate bubbles. For new oil cups, rinse three times with sample oil before first use.

Preheat the oil sample to 5~10°C above the test temperature (e.g., preheat to 95~100°C for a 90°C test).

II. Testing Process

Parameter Settings

Select the test mode (automatic/manual), set the temperature (commonly 90°C), and voltage (2/5/10kV options).

Use the reverse connection method for grounded equipment and the forward connection method for insulated equipment (high-voltage wire core and layer must not be short-circuited).

Start Testing

Close the chamber cover and start; the instrument automatically completes heating, temperature control (PID algorithm with ±0.5°C error), and data acquisition.

Testing time is typically 10~30 minutes; heating time should not exceed 60 minutes.

III. Safety Precautions

High Voltage Protection

Do not open the cover during testing; the oil cup carries 10kV high voltage, and contact may cause electric shock.

Dedicated high-voltage wires must be suspended and kept away from the human body and low-voltage wires.

Temperature Risks

The oil cup temperature can reach 120°C; allow it to cool after power-off before handling to prevent burns.

IV. Maintenance Requirements

Electrode Maintenance: Polish electrodes monthly (roughness ≤0.4μm), clean polytetrafluoroethylene parts with isopropyl alcohol.

Data Calibration: Use standard liquid (e.g., NIST SRM 2720) for quarterly calibration; reassemble if empty cup parameters are abnormal.

V. Typical Troubleshooting

Issue Phenomenon Solution

Abnormally high test values Check for oil cup contamination or loose assembly; clean and recalibrate

Instrument freeze Restart after power-off; check power stability

Heating failure Confirm 140ml oil is injected into the temperature measurement hole; check PID temperature control module

Product After-Sales Service Commitment is as follows:
1. We provide a free three-year warranty for the supplied products. After the warranty period expires, we will continue to provide follow-up services, with customers enjoying lifetime maintenance, ensuring timely after-sales service and technical consultation.
2. During the warranty period,人為 damaged components will be replaced at the procurement (processing) cost.
3. Can provide users with .
4. Provide real-time remote diagnosis and maintenance services.
5. During the warranty period, provide free product software upgrades, troubleshooting, performance optimization, technical consultation, and other after-sales technical support services.
6. Video guidance to train operators, enabling trainees to operate the instrument normally,初步判斷 faults, and perform simple maintenance.
7. Conduct annual customer visits.
8. Software upgrades: Provide new version control software free for life.
9. Provide applicable, detailed, and comprehensive Chinese product manuals and repair guides.
10. Provide a response to faults within 2 hours and on-site service within 24 hours.
11. Technical support: For users requiring instruments, provide professional technical solutions based on user requirements. In addition to常規(guī) instrument services, our technical department can also provide technical support for various non-standard equipment.
Regarding instrument return for factory repair: 1. Comprehensive repair and maintenance: After equipment damage, users often describe the damage unclearly and incompletely. Technicians often arrive on-site only to find that tools are不全 or spare parts need replacement but were not prepared in advance, leading to被動(dòng) or delayed repairs,耽誤ing customer use. Factory repair ensures齊全 spare parts and tools, and technicians perform systematic maintenance on returned equipment using factory facilities, addressing minor issues early. 2. Fast response speed: After equipment damage, even if we arrange for technicians to travel at the最快 speed, the process involves waiting for the technical department to assign specific personnel, which often takes time. Sometimes, due to technicians being continuously away,耽擱ed in one location, it may occasionally delay pre-arranged times with customers. With the發(fā)達(dá) logistics and express industry, nationwide transportation is fast and convenient, making factory repair often more省事省力.
Safety Precautions: Before powering on, please carefully read this user guide to prevent accidental injury to operators or damage to the instrument. Before operation, read "Installation and Setup" to ensure correct installation and connection of all instrument components. Before the first operation,務(wù)必 seek guidance from experienced personnel to prevent misoperation from causing accidents. Electric Shock Hazard: Ensure all wires are de-energized before installing or repairing the instrument to prevent harm to personnel or equipment under live conditions.

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