Partial Discharge Testing and Monitoring| Detailed introduction of technical principles

Partial discharge testers are precision instruments used to detect weak, localized discharges within electrical equipment.

Test Principle: The core principle involves using a high-frequency current sensor (HFCT) or coupling capacitance sensor to extract nanosecond-level high-frequency pulse current signals generated by partial discharges from the grounding wire or test circuit of the test object. This weak signal is amplified and converted into a digital signal by a high-speed acquisition unit. The instrument analyzes the signal's amplitude, phase, frequency, and waveform characteristics, comparing and separating them with background noise to identify, locate, and assess the severity of the discharge.

Application Features:
1. High Sensitivity and Interference Resistance: The core function is extracting weak discharge signals (down to the pC level) from strong electromagnetic noise, requiring extremely high-level instrument hardware and algorithms.

2. Non-destructive Diagnosis: Detection can be performed at relatively low voltages, allowing for early detection of insulation defects, making it a key method for preventative testing.

3. Powerful Functions: Features spectral analysis (PRPD spectrum), location, and type identification (e.g., corona discharge, floating discharge) to aid in fault diagnosis.

4. Wide Applications: An essential tool for insulation condition assessment and fault diagnosis in the manufacturing, installation, and operation and maintenance of equipment such as transformers, GIS, cables, and motors. Partial Discharge Testing and Monitoring, Partial Discharge Testing (PD Testing), Partial Discharge Testing Ultrasonic: -90-80dB, Ground Wave: -80-10dBm, UHF: -80-10dBm

Partial Discharge Tester, Scope of Application: Employs a non-invasive detection method to detect and locate partial discharge defects in high-voltage electrical equipment.

Sensor Configuration Standard: Ultrasonic sensor (UA), Ground Wave sensor (TEV); Optional: Transformer-specific sensor network, GIS-specific UHF sensor, high-voltage cable-specific sensor.

Customization is also available upon request. Detection Principles: Ultrasonic method (UA), Ground Wave method (TEV), and UHF method.

1. Scope of Application: Employs a non-invasive detection method to detect and locate partial discharge defects in high-voltage electrical equipment.

2. Sensor Configuration
Standard: Ultrasonic sensor (UA), Electromagnetic wave (TEV) sensor
Optional: Transformer-specific sensor network, GIS-specific UHF sensor, High-voltage cable-specific sensor. Customization is also available upon request.

3. Detection Principle: Ultrasonic method (UA), Electromagnetic wave (TEV) method, and Ultra-High Frequency (UHF) method.

4. Detection Frequency Band:
Ultrasonic: 40-200kHz
Electromagnetic wave: 3-100MHz
UHF: 300-2000MHz

5. Measurement Range:
Ultrasonic: -90-80dB
Electromagnetic wave: -80-10dBm
UHF: -80-10dBm

6. Sensitivity: Minimum 10pC (depending on the distance between the sensor and the discharge source).

7. Sensors:

① Ultrasonic sensor: 20-200kHz;

② Electromagnetic wave (TEV): 5-100MHz.

③ UHF sensor: 300-2000MHz, with directional receiving characteristics;

8. Built-in ultrasonic sensor, combined ground wave and ultrasonic wave sensor; optional transformer-specific sensor, GIS-specific sensor, cable-specific sensor, etc.;

9. Software functions:

① Continuously detects UHF, ground wave, and ultrasonic signals to determine the presence of partial discharge;

② Real-time display of the changing trend of the measured signal, allowing for a more intuitive judgment on the development of partial discharge signals;

③ Possesses on-site data storage function.

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