Power switchgear without partial discharge simulation test device

The core definition of the non partial discharge simulation test device for switchgear refers to a professional testing equipment that adopts a physical switchgear structure design, built-in multiple adjustable discharge models and non partial discharge high voltage systems, can truly reproduce various partial discharge phenomena in laboratory environments, and has its own partial discharge capacity ≤ 5pC, ensuring pure and measurable discharge signals.

1、 Core Definition and Technical Principles

As the core control unit of the power system, partial discharge caused by internal insulation defects in switchgear is the main cause of equipment failure. Common defects include conductor discharge, floating potential discharge, insulation air gap discharge, and metal particle discharge. The core definition of the non partial discharge simulation test device for switchgear refers to a professional testing equipment that adopts a physical switchgear structure design, built-in multiple adjustable discharge models and non partial discharge high voltage systems, can truly reproduce various partial discharge phenomena in laboratory environments, and has its own partial discharge capacity ≤ 5pC, ensuring pure and measurable discharge signals.

The technical principle integrates high-voltage simulation and signal precision control technology: firstly, the built-in non partial discharge high-voltage transformer boosts the 220V power supply to an adjustable high voltage of 0-30kV, which is smoothly applied to the discharge model through a coupling capacitor; Simulate different types of defects by changing the structural parameters of the discharge model through mechanical adjustment mechanisms, such as electrode spacing, suspended conductor contact state, etc; The pulse signal generated by partial discharge is captured by a high-frequency sensor, and then filtered, amplified, and digitized by a data acquisition unit to synchronously generate parameters such as discharge amount, phase, and frequency; Finally, the full process control and data visualization display of the experimental process are achieved through a touch control system. The system adopts full metal shielding shell and signal isolation technology to effectively isolate external electromagnetic interference, ensuring the authenticity and stability of discharge signals.

2、 Core Composition and Design Highlights of the System

The simulation test device for switchgear without partial discharge adopts a modular integrated design, with each component working together to form a complete test chain. The core components include five major modules. The high-voltage module without partial discharge serves as the energy supply unit, with a rated capacity of 3-20kVA, an output voltage of 0-30kV, and a partial discharge capacity of ≤ 3pC, providing a pure high-voltage environment for the experiment; The discharge model module covers four typical defect models: suspension, air gap, and particle, supporting single or composite fault simulation; The signal detection module is equipped with various types of sensors such as pulse current, ultra-high frequency, and ultrasonic, covering the detection frequency range of 10kHz-100MHz; The data processing module adopts a dual CPU architecture to achieve synchronous signal acquisition and real-time analysis; The control display module is equipped with a 10 inch touch screen, which supports parameter settings and visualization of test curves.

The design highlights are mainly reflected in three aspects: first, strong authenticity, designed according to a 1:1 ratio of physical switchgear, with internal electric field distribution, insulation structure consistent with actual equipment, and discharge characteristics highly consistent with on-site faults; The second is precise regulation. The discharge starting voltage, extinguishing voltage, and discharge intensity can be accurately set through an external control box, with an adjustment accuracy of ± 1%; Thirdly, it is safe and intelligent. The high-voltage unit is equipped with interlocking protection, which can cut off the power supply within 5ms in case of abnormal testing. At the same time, it is equipped with an infrared video probe, which can observe the internal discharge process in real time and record images.

3、 Core functions and significant advantages

The device covers all scenarios of fault simulation, detection and verification, and measurement transmission, with practicality and professionalism. The core functions include: fault simulation function can independently or in combination generate four typical partial discharges, support 30-300Hz wide frequency range testing, and meet the simulation requirements of different working conditions; The detection and verification function provides a standard signal source for various partial discharge detection instruments, which can assess the sensitivity, anti-interference ability, and defect recognition accuracy of the instruments; The measurement transmission function is equipped with a pulse current calibration unit, which can synchronously verify the accuracy of discharge and ensure the traceability of test data; The data management function supports automatic generation, storage, and USB export of test reports, facilitating data archiving and analysis.

Compared to traditional testing methods, its advantages are prominent: firstly, it has high safety, transferring high-voltage testing to a controllable laboratory environment to avoid the risk of equipment damage caused by on-site testing; Secondly, the efficiency has been improved, with the single group test time reduced to less than 30 minutes and a defect reproduction success rate of 100%, far exceeding on-site random testing; Thirdly, the scenarios are diverse and can be adapted to test different voltage levels of switchgear, supporting the development and verification of new detection technologies; The fourth is cost optimization, which can complete experiments without dismantling actual equipment, reducing operation and development costs.