Partial Discharge Testing and Monitoring| Detailed introduction of technical principles

Ultrasonic partial discharge testers perform non-contact fault diagnosis by detecting the ultrasonic signals generated by discharges.

Test Principle: When a partial discharge occurs inside equipment, it instantaneously generates high-frequency sound signals (typically in the 20kHz-300kHz range). The instrument receives these signals through a highly sensitive ultrasonic sensor (probe) and converts them into electrical signals. After amplification, the signal intensity, phase, and mode spectrum are analyzed. Because ultrasonic waves propagate within the solid insulation and casing of the equipment, precise location of the discharge point can be achieved through multi-point detection and signal time-difference analysis.

Application Features:
1. Strong resistance to electromagnetic interference: Unaffected by strong electromagnetic environments, particularly suitable for live-line detection and online monitoring.

2. Precise location: Combined with techniques such as time-difference analysis, it can spatially locate discharge points inside equipment such as GIS, transformers, and cable joints.

3. Sensitivity affected by propagation path: Signal strength is significantly affected by the medium, distance, and structure; typically used for short-range detection and auxiliary qualitative analysis.

4. Safe and Convenient: Enables non-contact, live-line detection, making it a common tool for power equipment condition inspection and fault location. Partial Discharge Testing and Monitoring, Partial Discharge Testing (PD Testing), Partial Discharge Testing 0-70 dBmV. Ultrasonic Partial Discharge Tester, Infrared Acoustic Version: Utilizes microphone array technology to collect acoustic wave data, combined with a high-definition camera to achieve acoustic wave localization.

After analyzing the acoustic wave localization technology using beamforming, acoustic wave distribution data is obtained. This data is then fused with video to generate an acoustic cloud map, which is dynamically displayed on a screen.

It can be widely used for partial discharge detection in power systems, including insulation status detection of high-voltage switchgear, ring main units, voltage/current transformers, transformers (including dry-type transformers), GIS, overhead lines, cables, etc.

The degree of discharge in electrical equipment is measured using the following indicators: Partial Discharge Intensity Detection: By measuring the discharge signal within one power frequency cycle,

the intensity of the partial discharge is characterized by the maximum value (dB) in the discharge pulse sequence.

◇ Product Features

The acoustic imaging module is developed to suit various applications such as power system inspection robots, drones, and online monitoring, and is adaptable to diverse situations.

Once a gas leak occurs, the acoustic imaging module can detect the ultrasonic/sound waves generated during the leak, thereby locating the leak's location and triggering an alarm. This function is based on acoustic imaging technology, utilizing a microphone array to scan spatial sound waves and determine the fault location through phase differences in the sound waves, obtaining an "acoustic image."

The acoustic imaging module is developed to suit various applications such as power system inspection robots, drones, and online monitoring, and is adaptable to diverse situations. Once a gas leak occurs, the acoustic imaging module can detect the ultrasonic/sound waves generated during the leak, thereby locating the leak's location and triggering an alarm. This function is based on acoustic imaging technology, utilizing a microphone array to scan spatial sound waves and determine the fault location through phase differences in the sound waves, obtaining an "acoustic image."

1. Enables partial discharge detection in almost all high-voltage electrical equipment by configuring different sensors;

2. Provides various discharge spectra such as time-domain waveforms, PRPD, and PRPS for analysis of different discharge types;

3. Employs a non-invasive detection method; no power outage or additional high-voltage source is required during testing, making it more convenient than traditional pulsed partial discharge detectors;

4. Test bandwidth range is 30kHz - 2.0GHz, suitable for detection in various frequency bands.

Ground wave parameters:

1. Measurement range: 0-70 dBmV

2. Resolution: 1dB

3. Accuracy: ±1dB

4. Maximum pulses per cycle: 1400

5. Measurement frequency band: 3-100MHz

Contact ultrasonic parameters:

1. Measurement range: -6dBμV - 70dBμV

2. Resolution: 1dB

3. Accuracy: ±1dB

4. Frequency range: 20-200 kHz

Non-contact ultrasonic parameters:

1. Measurement range: -6dBμV-70dBμV

2. Resolution: 1dB

3. Sensor center frequency: 40 kHz

Ultra-high frequency parameters:

1. Detection frequency band: 300-3000MHz

2. Measurement range: 0-70 dBmV

High-frequency transformer parameters:

1. Sensor transmission impedance: 9.9mV mA

2. Detection frequency: 3-30MHz

3. Sensitivity: 1mV

4. Detection range: 0-3000 mV

Infrared Sensor
1. Resolution 384×288
2. Temperature Range -20℃-400℃
3. Temperature Accuracy ±2℃

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