The insulation oil gas evolution tester is an important equipment for evaluating the performance of insulation liquids such as cable oil, capacitor oil, and transformer oil. It mainly relies on the standards GB/T 11142, NB/SH/T 0810, and ASTM D2300 to simulate the electric field and temperature conditions in actual working conditions, and detect the ability of insulating oil to release or absorb gases under the action of high-voltage electric fields. This indicator is directly related to the long-term stability and safety of oil products in electrical equipment, as the gas evolution process may affect insulation strength and even lead to equipment failure.

Core detection principle: gas-liquid equilibrium reaction under the action of electric field

The determination of the gas evolution of insulating oil is essentially the observation of the gas behavior of the oil at the gas-liquid interface under controlled conditions. The working principle of the instrument is based on the following key steps:

Environmental simulation and sample preparation

During testing, the insulating oil sample is first placed in a specialized transparent testing chamber, which is kept at a constant temperature (usually set according to standards, with an instrument temperature control range of 0 ℃ -100 ℃ and an accuracy of ± 0.5 ℃). Reserve space in the upper part of the testing pool and fill it with dry air or specific gases to form a clear gas-liquid interface. The entire system is placed inside a transparent safety cover to ensure safe operation.

High voltage electric field loading

The instrument outputs a test voltage of 10kV (with an accuracy of ± 2%) through a dry-type high-voltage transformer and applies it to the electrodes in the test cell. The electric field strength has been calibrated to induce discharge at the gas-liquid interface of insulating oil, simulating the partial discharge or electrical stress conditions that may occur in electrical equipment. Under the action of this electric field, dissolved gases or oil molecules in insulating oil may undergo ionization, decomposition, or polymerization reactions, resulting in gas release or absorption.

Monitoring of gas exchange process

During the testing process, the instrument introduces gas into the testing pool at a constant flow rate (usually 3L/h) to maintain the stability of the gas environment in the system. Meanwhile, continuous monitoring of gas volume changes at the gas-liquid interface is achieved through pressure sensors or volume change detection devices. If the insulating oil tends to release gas, the pressure or volume of the gas chamber will increase; On the contrary, if the oil absorbs gas, the pressure or volume will decrease. This process continues, and the standard testing time can be set within 1-120 minutes. The instrument automatically counts (with an accuracy of ± 1 second) to ensure data consistency.

Data evaluation and result interpretation

After the test is completed, the gas volume change recorded by the instrument is converted into a gas evolution index, usually expressed in terms of the volume of gas released or absorbed per unit time (such as μ L/min). Positive values indicate the release of gas from the oil product, while negative values indicate the absorption of gas. This result reflects the chemical stability of insulating oil under an electric field: the release of gas may originate from the decomposition of the oil, indicating a tendency towards aging; Absorbing gas may reflect the inhibitory ability of oil products on discharge products. Test data can be used to compare standard limits and help determine whether the oil is suitable for high-voltage electrical equipment.

Key elements of technological implementation

To achieve the above principle, the instrument integrates multiple technologies:

Precision temperature control system: using PID algorithm to regulate the constant temperature oil bath, ensuring stable testing temperature and avoiding temperature fluctuations that interfere with gas behavior.

Reliable High Voltage Output: The combination of dry-type high voltage transformers and epoxy vacuum casting technology provides a stable and reliable 10kV electric field, reducing the impact of voltage fluctuations on testing.

Safety and automation design: Transparent protective cover and automatic alarm function ensure safe operation, while touch screen control and Chinese menu simplify the experimental process.

Standardization compatibility: The instrument supports multiple standard selections to ensure that testing methods comply with international and domestic standards, enhancing data comparability.

summary

The detection principle of the insulation oil gas evolution tester is to quantify the gas release or absorption characteristics of the insulation oil under discharge conditions by simulating the electric field, temperature, and gas environment. This process not only reveals the chemical stability of the oil, but also provides key data for preventing electrical equipment failures. The design of the instrument emphasizes controllability, safety, and standardization, making it a practical tool for quality control in fields such as electricity and chemical engineering. Understanding this principle can help users better apply test results, optimize the selection and maintenance strategies of insulation oil.