Partial discharge sensor 2-in-1 TEV ultrasonic switchgear partial discharge online monitoring partial discharge detector
The keywords you entered cover a very core detection technology in power equipment operation and maintenance - TEV (Transient Earth Voltage) and ultrasonic (AE) 2-in-1 partial discharge detection. This type of equipment is mainly used for insulation status assessment of high-voltage switchgear and other equipment, and can non-invasively capture partial discharge defects inside the equipment.
Combined with your location in Yangzhou, Jiangsu (an important industrial belt for domestic power test equipment), here is a summary of the core technical principles, product forms, and selection points of this series of 2-in-1 partial discharge detection equipment:
1. Core Technical Principle: Acoustic-Electric Combined Detection
The 2-in-1 partial discharge detector integrates two detection technologies into one unit, greatly improving the accuracy of partial discharge location and recognition rate through the "acoustic-electric combined method":
TEV (Transient Earth Voltage) Detection: When partial discharge occurs inside the switchgear, transient voltage is induced on the surface of the metal cabinet. TEV sensors detect this transient voltage on the metal cabinet surface and are highly sensitive to both surface and internal discharges.
AE (Acoustic Emission) Detection: Partial discharge generates high-frequency acoustic vibrations. Ultrasonic sensors capture vibration waveforms in the 20kHz~200kHz frequency band, and with good directivity and low attenuation, they can achieve non-contact precise positioning.
2. Mainstream Product Forms and Application Scenarios
Depending on the usage method, 2-in-1 partial discharge devices on the market are mainly divided into two major categories:
Portable Partial Discharge Inspection Instrument (Handheld)
Features: The device host has built-in TEV and ultrasonic dual sensors, and can be used for routine switchgear inspections right out of the box. Equipped with a full-color touch screen, it supports generating various discharge patterns such as time-domain waveforms, PRPD (Phase-Resolved Partial Discharge patterns), and PRPS (three-dimensional patterns) to distinguish typical defects like corona, floating, and creeping discharges.
Advantages: Non-invasive detection, no power outage required, no additional high-voltage source needed, suitable for daily inspections and hidden danger troubleshooting.
Online Monitoring System (Fixed)
Features: Uses wireless sensors (such as LoRa/NB-IoT communication) that are magnetically attached to the switchgear surface, providing 24-hour real-time online monitoring and uploading data to the backend master station system.
Advantages: Achieves a transition from "post-fault repair" to "predictive maintenance", supports 7×24 hour continuous tracking, and can trigger graded alarms based on discharge count and amplitude.
3. Expandability and Multi-Modal Detection
Although 2-in-1 devices are the main force for switchgear inspections, many hosts have strong expandability. By connecting different specialized sensors, comprehensive hosts can also cover detection of more power equipment:
GIS/Transformers: Can connect external UHF (Ultra-High Frequency) sensors or contact ultrasonic sensors.
High-voltage cables: Can connect external High-Frequency Current Transformers (HFCT) to clamp onto ground wires to capture pulse currents.
Overhead lines/insulators: Can connect external ultrasonic wave concentrators to collect weak ultrasonic signals from a distance.
4. Key Selection and Usage Suggestions
Anti-interference capability: The electromagnetic environment at substations is complex. When purchasing, pay attention to whether the equipment has digital filtering technology and excellent anti-interference performance (such as suppression of power frequency electric fields, communication signals, ultrasonic rodent repellers, etc.).
Battery life and installation: Portable devices usually use built-in lithium batteries, so pay attention to the continuous working time per charge (mainstream can reach 6-8 hours or more); for online sensors, pay attention to battery life and installation methods (such as strong magnetic adsorption).
💡 Further Assistance
This type of 2-in-1 partial discharge detection equipment is the "stethoscope" for ensuring the safe operation of distribution networks. May I ask what your specific needs are currently:
Product selection and comparison: Do you need me to sort out procurement suggestions for portable inspection instruments and fixed online monitoring systems, or compare the pattern analysis algorithms of different manufacturers?
On-site operation and diagnosis: Do you need to understand how to judge whether it is "floating potential discharge" or "tip discharge" inside the switchgear based on PRPD/PRPS patterns during actual inspections?
System configuration plan: Do you need to calculate how many online monitoring nodes or sensors need to be configured based on the size of your distribution room?
