HZJF90 Portable PD Partial Discharge Tester 

Introduction

Partial discharge is a sign and manifestation of insulation deterioration in power equipment, and it is also the cause of further insulation deterioration. Since the consequences of insulation breakdown are often serious, it is particularly important to conduct partial discharge detection on power equipment. The local discharge of electrical equipment belongs to electrical discharge that will not completely short-circuit the electrodes. Although the amplitude of this discharge is usually small, it can continuously degrade the insulation performance and may eventually lead to failure. Live partial discharge detection provides a fast and simple method to identify potential insulation faults that may cause power outages or personnel injuries.

According to the requirements for live detection in the "Technical Specification for Live Detection of Power Equipment" by the State Grid Corporation of China, this instrument uses high-frequency detection technology to measure partial discharge and comprehensively applies computer technology, ultrasonic, radio frequency, transient waveform sampling technology, analog electronic technology, high-speed signal acquisition technology, and advanced digital signal processing technology. It is developed based on the Linux operating system platform, providing 2D and 3D maps of partial discharge, amplitude phase spectrum waveform, and discharge signal quantification value. By statically or dynamically observing and analyzing the partial discharge pulse waveform of a single or multiple cycles in detail, the partial discharge condition of electrical equipment can be evaluated well. It is suitable for daily inspection of the insulation performance of high-voltage cables, power transformers, and other electrical equipment. It has the characteristics of high sensitivity and strong adaptability and can effectively detect related insulation defects. It is an ideal tool for state detection of power equipment during live operation.

Main Technical Parameters

Non-contact Ultrasonic Sensor (AA)

Central frequency of the sensor: 40KHz ± 1KHz

Measurement range: -7~68dBuV

Resolution: 0.1dB

Linearity error: <±20%

Sensor form: Bendable form/Focusing form

Contact Ultrasonic Sensor (AE)

Detection frequency band: 20KHz~80KHz (SF6 gas-insulated power equipment)

80KHz~200KHz (Oil-filled power equipment)

Dynamic measurement range: 60dB

Resolution: 0.1dB

Linearity error: <±20%

Transient Earth Voltage Sensor (TEV)

Detection frequency band: 3MHz~100MHz

Measurement range: 0~60dBmV

Resolution: 0.1dB

Linearity error: <±20%

Ultra-High Frequency Sensor (UHF)

Detection frequency band: 300MHz~1500MHz

Measurement range: -70dBm to -10dBm

Effective sensor height: ≥10mm

Resolution: 0.1dBm

High-Frequency Sensor (HF)

Detection frequency band: 0.3MHz~30MHz

Measurement range: 0~70dB

Gain: -30~20dB

Resolution: 0.1dB

Transmission impedance: ≥10mV/mA

Input impedance: 50Ω

Machine Parameters

Operating environment: Temperature -20℃～50℃, humidity 0～85%

Display screen: High-definition color 5.6-inch TFT LCD display,

resolution 480*640

Mainframe size: 230x170x48mm

Mainframe weight: 1.35Kg

Battery life: About 6 hours