For technical professionals, breakdown voltage test of transformer oil in India is key to understanding the reliability of high-voltage equipment. Regular analysis of mineral oils used in transformer insulation allows for early detection of issues in the equipment operation. In this article, we are going to delve into the significance of breakdown voltage test and the equipment used for breakdown voltage measurements.

Understanding a breakdown voltage test of liquid dielectrics

In electrical terms, a liquid dielectric is an insulating substance capable of sustaining an electric field and preventing the flow of electric current. A breakdown in liquid dielectrics occurs when the applied electrical stress exceeds the dielectric strength of liquid, resulting in catastrophic failure of insulation. This process depends on various factors, including the intrinsic properties of liquid, the presence of impurities, the temperature, and the geometry of surrounding electrodes.

A breakdown voltage test is a procedure used to evaluate the dielectric strength of insulating liquids. Compliance with international standards, such as those established by ASTM or IEC, is a must for ensuring the consistency and reliability of the test results.

Significance beyond numbers

Beyond the scope of a numerical parameter, the breakdown voltage test of transformer oil assumes a dynamic role with profound implications for transformer performance. A higher breakdown voltage not only ensures a robust insulation system, but also mitigates the risk of electrical failure, thereby enhancing the overall operational reliability of transformers. 

Comprehensive insight into breakdown voltage involves the use of specialized testing equipment. Basically, these are test cells with electrodes to be immersed in transformer oil. The gradual increase of voltage across these electrodes in accordance with the standardized testing protocols, such as IEC 60156 and ASTM D877, facilitates the precise determination of oil breakdown voltage.

The findings of these tests allow maintenance professionals to make informed decisions, fostering the predictive maintenance strategies that proactively address potential issues. This strategic utilization of breakdown voltage data ensures optimized performance and service life of transformers.

Performing a breakdown voltage test of transformer oil

Performing a breakdown voltage test of transformer oil involves a meticulous process to evaluate its dielectric strength. The testing equipment typically comprises a specialized test cell with two electrodes immersed in the oil. The voltage is gradually increased across the electrodes until an electrical breakdown occurs. This phenomenon is observed as a visible electrical discharge in the oil. It is crucial to ensure the standardized testing conditions, which include oil temperature, electrode gap, and voltage application rate. Gradual increase of voltage allows for precise determination of oil breakdown voltage. 

Interpretation of test results involves the analysis of breakdown voltage levels under different conditions. Consistency and repeatability of the results are crucial. Statistical methods are often employed to understand the variations and predict the performance of liquid dielectric material while in use.

The breakdown voltage test of transformer oil in India serves as a proactive diagnostic evaluation tool, enabling the identification of potential weaknesses in transformer insulation. Regular testing is fundamental to predictive maintenance, which ensures the early detection of issues before they escalate. 

 GlobeCore equipment for breakdown voltage test of transformer oil in India

GlobeCore product line of transformer oil breakdown voltage testers comprises a variety of models, each tailored to specific testing needs and standards. This section delves into the unique features and functionalities of each model: TOR-80A, TOR-80, TOR-100, and TOR-100A.

• TOR-80 is distinguished by its uncompromising precision and capability to measure a breakdown voltage up to 80 kV. The automated measurements not only enhance the accuracy, but also streamline the testing process, making it an ideal choice for routine diagnostic evaluation and predictive maintenance. This tester’s ease of operation allows it to meet the needs of professionals at all expertise levels.
• TOR-80A is similar to TOR-80 in functionality; the TOR-80A is distinguished by an internal rechargeable battery, enabling its operation in the field. It offers the flexibility to conduct tests at transformer sites, which enhances its practical utility.
• TOR-100: this tester is specifically designed for high-precision tests with the ability to measure breakdown voltages up to 100 kV. It includes an integrated printer for immediate logging of test results and a USB connector for data transfer.
• TOR-100A: with its primary functions similar to those of TOR-100, this tester features advanced capabilities with additional advantage in the form of an internal rechargeable battery. This feature ensures extended offline operation, making it suitable for on-site testing at the transformer’s operating location. 

Each model in GlobeCore product line of transformer oil breakdown voltage testers is designed for specific testing requirements, offering a range of functionalities from basic to advanced. This variety ensures that users can select a model that is best suited for their operational and diagnostic needs.

Advantages of GlobeCore testers

GlobeCore testers — TOR-80A, TOR-80, TOR-100, and TOR-100A — deliver enhanced functionality compared to conventional testers. While professionals address the difficulties of India’s energy infrastructure, these instruments become indispensable for improving the efficiency, ensuring precision where voltage testing is integrated into operational tasks.

Accuracy and automation: each device is designed for automated and accurate breakdown voltage measurements with rapid test voltage shutoff upon breakdown detection.

Versatility and mobility: the models like TOR-80A include internal batteries, allowing for field operation and on-site testing, which is crucial to real-time transformer maintenance.

User interface and data management: the added features, such as integrated printers, USB connectors, and PC connectivity options, facilitate data logging and analysis.

Compliance with standards: all the tester models comply with international standards, ensuring that testing procedures and results are globally recognized and reliable.

Customization: the ability to modify and expand standard lists in line with customer preferences and emerging standards makes these instruments adaptable to evolving test requirements. 

GlobeCore product line of testers offers a comprehensive solution for breakdown voltage test of transformer oil. These devices combine technical excellence with practical features, making them a valuable asset for various industrial and research applications.