Intelligent integrated non partial discharge power frequency withstand voltage testing system

The core definition of an integrated non partial discharge power frequency withstand voltage testing system refers to an integrated testing equipment that can not only output pure power frequency high voltage that meets the standard to complete the withstand voltage test within the same system framework, but also synchronously collect and analyze partial discharge signals, and control the system's own partial discharge at a low level (usually ≤ 5pC) to ensure the authenticity and reliability of the detection data.

1、 Core Definition and Technical Principles

Power frequency withstand voltage testing is the core method for testing the insulation withstand power frequency voltage capability of electrical equipment, while partial discharge detection is the key technology for capturing early insulation defects. The combination of the two can evaluate the insulation status of equipment. The core definition of an integrated non partial discharge power frequency withstand voltage testing system refers to an integrated testing equipment that can not only output pure power frequency high voltage that meets the standard to complete the withstand voltage test within the same system framework, but also synchronously collect and analyze partial discharge signals, and control the system's own partial discharge at a low level (usually ≤ 5pC) to ensure the authenticity and reliability of the detection data.

The technical principle is based on the integration of electromagnetic induction and signal synchronization acquisition technology: firstly, the low-voltage power supply is boosted to 0-500kV adjustable power frequency high voltage by the built-in non partial discharge test transformer of the system through iron core magnetic coupling, and the output terminal treated with special insulation is applied to the test object; The high-voltage divider collects real-time output voltage signals and feeds them back to the measurement and control system to achieve precise voltage regulation; At the same time, the partial discharge detection unit captures the partial discharge pulse signal of the test sample through a high-frequency sensor, and after filtering, amplification, and digital processing, it achieves time synchronization with the voltage signal; Finally, the embedded system runs a dedicated algorithm to remove interference and calculate parameters of the partial discharge signal, generating a voltage withstand curve and partial discharge spectrum. The system uses full shielding design and signal isolation technology to suppress its own and external interference from the source, ensuring the accuracy of partial discharge detection.

2、 Core Composition and Design Highlights of the System

The integrated non partial discharge power frequency withstand voltage testing system adopts a modular integrated design, and the components work together to form a complete testing chain. The core components include five major modules. The transformer module without partial discharge test adopts DQ150 high permeability silicon steel sheet and cylindrical winding structure, combined with 25 # refined insulation oil and epoxy cylinder composite insulation, to control its own partial discharge; The high-voltage divider module adopts the principle of capacitive voltage division, with a voltage division ratio error of ≤ 0.5%, ensuring accurate voltage measurement; The partial discharge detection module is equipped with a broadband sensor (10kHz-100MHz) that can capture different types of partial discharge signals; The measurement and control module adopts a dual CPU architecture to achieve synchronous voltage regulation and signal processing; The operation display module is equipped with a 10 inch touch screen, supporting parameter settings and data visualization.

The design highlights are mainly reflected in three aspects: firstly, precise interference control. The system shell adopts a 304 stainless steel fully shielded structure, and the internal signal cables use twisted pair shielded wires, which can effectively isolate external electromagnetic interference; The high-voltage joint adopts anti corona design to avoid interference caused by air gap discharge. Secondly, it has a high degree of integration, with all core components integrated into an integrated cabinet, occupying only one-third of the space of traditional decentralized equipment. Some portable models are controlled within 50kg in weight, which is suitable for on-site testing needs. The third is safety design *, equipped with multiple safety mechanisms such as high-voltage interlocking, overcurrent and overvoltage protection, emergency shutdown, etc. When an abnormality occurs during testing, the high-voltage output can be cut off within 5ms, and an audible and visual alarm can be triggered at the same time.

3、 Core functions and significant advantages

The system functions cover the entire process of high-voltage testing, combining professionalism and practicality. The core testing functions include: the power frequency withstand voltage test can achieve continuous adjustment of 0-120% rated voltage, support voltage holding for any duration of 1-9999s, and automatically record the leakage current changes during the withstand voltage process; Partial discharge testing can accurately measure parameters such as partial discharge charge (0-10000pC) and partial discharge frequency, and generate various analysis charts such as partial discharge phase spectrum and trend chart; The data processing function supports automatic storage of test data, report generation, and USB export. Some models can achieve remote data upload through 4G/5G modules.

Compared to traditional decentralized devices, its advantages are extremely prominent: firstly, it has high operational efficiency, does not require complex wiring, only needs to connect the test object to the ground terminal, and can complete withstand voltage and partial discharge testing with one click start, reducing testing time by more than 60%; Secondly, the data synchronization is good, with microsecond level synchronization between voltage signals and partial discharge signals, avoiding analysis errors caused by signal delays in traditional equipment; Thirdly, it has strong adaptability and supports testing of various equipment such as CT, PT, GIS, and cables. By replacing the testing accessories, it can adapt to different voltage levels and specifications; Fourthly, it has a high degree of intelligence, with multiple built-in testing protocol templates that can automatically complete data organization and qualification judgment, reducing the skill requirements for operators.