The portable partial discharge detector is a portable instrument used to detect and locate the partial discharge (PD) phenomenon that occurs internally or on the surface of electrical equipment (such as high-voltage cables, switch cabinets, transformers, insulators, etc.) due to insulation defects, without interrupting the operation of the equipment (while it is energized).
Explanation of relevant terms for portable partial discharge detector:

Partial Discharge (PD): Refers to the discharge phenomenon that occurs in a localized area of the insulation within an electrical device, but does not extend throughout the electrodes. It is an important early sign of insulation deterioration. Just like a small rust spot on a water pipe, although it has not completely broken yet, it has already begun to leak water.
Electrical testing: This means that the equipment being tested does not need to be powered off and can be inspected under normal operating voltage, significantly enhancing the reliability of power supply and the efficiency of testing.
Portable: The equipment is designed to be lightweight and battery-powered, making it easy for on-site technicians to carry and operate.
The core components of the portable partial discharge detector
Host/Analyzer: The central brain, responsible for signal processing, data analysis, display and storage. Usually has a touchscreen interface.

Sensor:
UHF sensor: Used for detecting discharges inside GIS (Gas Insulated Switchgear) and transformers.
HFCT sensor: A clamp-type structure that is clamped onto the grounding wire of the equipment to detect discharge current pulses.
Ultrasonic sensor: Used for detecting external discharges in air-insulated equipment and for more precise positioning.
TEV sensor: Integrated onto the main unit, used for detecting in switch cabinets.
Software system: Built-in intelligent algorithms are used to identify the type of discharge (internal discharge, surface discharge, corona discharge), assess the severity of the discharge, and generate reports, etc.
Attachment: Includes headphones (for listening to ultrasonic abnormal sounds), extension rod, charger, and portable case, etc.
Main functional features of the portable partial discharge detector
Non-invasive detection: Does not interfere with the normal operation of the equipment, is safe and reliable.
Early fault detection: It can promptly identify potential problems before insulation faults occur, enabling predictive maintenance.
Discharge type identification: The intelligent software can distinguish different types of discharges, helping to determine the nature of the fault.
Discharge capacity assessment: Conduct a preliminary evaluation of the severity of the discharge.
More precise positioning: By combining ultrasonic and UHF technologies, the discharge point can be located more accurately, providing a clear target for maintenance.
Data storage and reporting: Record detection data, generate historical trend charts and analysis reports, facilitating the tracking of equipment status.
User-friendly: Compact design, simple operation, and intuitive result display (such as waveform diagrams, PRPD spectrograms, signal strength, etc.).

The main application scope of the portable partial discharge detector

Power system: Daily inspections of power plants, substations and distribution networks.
Switch cabinet: This is the primary application scenario, used for detecting internal insulation faults.
Power cables and accessories: Inspect the manufacturing defects and aging of cable terminals and intermediate joints.
Transformer: Detect the deterioration of the internal insulating oil and paper.
GIS (Gas Insulated Switchgear): Detects internal free metal particles, insulator defects, etc.
Overhead line: Detect the deterioration or flashover of the insulator string.
Industrial sector: Maintenance of power supply systems in large factories, mines, and petrochemical enterprises.
Rail Transit: Inspection of the traction power supply systems for subways and high-speed trains.
New energy: Inspection of the booster stations and transmission lines of wind farms and photovoltaic power stations.