The high-voltage partial discharge shielding chamber is a special experimental environment specifically designed for partial discharge (PD) detection. As a laboratory for achieving “electromagnetic purity”, its core objective is to create ideal conditions for high-precision partial discharge measurements. The core functions revolve around electromagnetic shielding, test safety assurance, and the realization of precise measurement data. Specifically, it can be divided into three aspects:
1. Provide an electromagnetic shielding environment (core function)
The core role of the high-voltage partial discharge shielding chamber is to construct a stable electromagnetic shielding space. It relies on the Faraday cage structure formed by metal walls to achieve two-way control of electromagnetic signals, blocking both external interference from entering and internal signals from leaking. External electromagnetic noise, such as those from broadcasting, television, mobile phone signals, Wi-Fi, grid harmonics, and the switching operations of electrical equipment, has frequencies and amplitudes that are easily overlapped with or even submerged by the local discharge signals of the tested equipment. The shielding chamber can effectively attenuate and block such external electromagnetic interference, ensuring that the signals captured by the measurement system only originate from the internal discharge of the tested equipment.
Preventing internal signal leakage: During high-voltage partial discharge tests, strong electromagnetic radiation is generated. The shielding chamber can prevent such radiation from leaking to the external environment, avoiding interference to the normal operation of surrounding precision electronic equipment, and meeting the requirements of electromagnetic compatibility (EMC) regulations.
2. Create safe and reliable high-voltage test conditions
The high-voltage partial discharge shielding chamber has built a closed and controllable exclusive space for high-voltage tests, avoiding various safety risks in high-voltage tests from both the human and equipment perspectives, ensuring the safety and reliability of the entire test process.
Ensuring personal safety: The shielding chamber is equipped with an interlock system. When the shielding chamber door is opened, the system will automatically cut off the high-voltage power supply, preventing personnel from entering the electrified high-voltage area at the hardware level and eliminating the risk of electric shock for the test personnel.
Ensuring equipment safety: The enclosed and controllable space can achieve the safe layout of high-voltage leads, voltage equalization devices, and other test facilities, effectively reducing the risk of flashover caused by external accidental contact, sudden airflow, or small animal intrusion, or causing damage to the test equipment.
3. Ensure the accuracy and reliability of measurement data
Achieving precise and reliable measurement data is the ultimate goal of all the functional designs of the high-voltage partial discharge shielding chamber. A qualified high-voltage partial discharge shielding chamber can provide data support for partial discharge measurements from three aspects: noise control, signal identification, and result universality:
Significantly reducing background noise: The test system’s background noise is controlled at an extremely low level, achieving noise indicators of less than 1 pC or even lower;
Significantly improving signal-to-noise ratio: In an “quiet” environment without electromagnetic interference, the weak local discharge signals of the tested equipment can be clearly distinguished, effectively improving the sensitivity and accuracy of the measurement;
Ensuring the credibility of test results: Making the partial discharge test results from different times and different laboratories comparable and repeatable, providing scientific and reliable data basis for the quality judgment, equipment status assessment, and fault diagnosis of high-voltage electrical equipment.
The core value of the high-voltage partial discharge shielding chamber lies in creating a “pure” electromagnetic environment through professional electromagnetic shielding design, thereby achieving accurate, reliable, and safe detection of weak local discharge signals in high-voltage electrical equipment. Precise detection of local discharge signals is a key means for evaluating the insulation system quality of high-voltage electrical equipment.
Post time: Jan-20-2026