The KDZD3088 ultrasonic line partial discharge inspection instrument independently developed and produced by our company adopts precision high-frequency ultrasonic sensors to collect and select characteristic sound waves emitted by partial discharge of 110kV and below power equipment. Through filtering and comparison, it can locate and judge defects. And it can synchronize the collected real-time data to the cloud, truly achieving front-end detection and back-end viewing and analysis.
Suitable for detecting partial discharge of various non enclosed electrical equipment such as knife switches, switchgear, insulators, transformers, lightning arresters, cable joints, fittings, etc. in substations or transmission and distribution lines.
Instrument Introduction and Working Principle
working principle
Ultrasonic waves: When partial discharge occurs inside the insulation of power equipment, ultrasonic signals are generated. The ultrasonic signals are transmitted from the partial discharge source along the insulation medium, metal parts, or air to the equipment casing, and propagate to the surrounding air through the medium and gaps. By coupling ultrasonic signals generated by partial discharge in the air through ultrasonic sensors, the partial discharge situation of power equipment can be determined.
Reference standards
Q/GDW 11061 Technical Specification for Partial Discharge Ultrasonic Testing Instrument
GB/T 7354 High Voltage Test Techniques - Partial Discharge Measurement
Regulations on Substation Testing Management of State Grid Corporation of China, Volume 4: Detailed Rules for Ultrasonic Partial Discharge Testing
Judgment criteria
(1) The main criterion for judgment is based on the characteristics of partial discharge sound heard in the headphones during the detection process, and is determined based on the duration and frequency of the sound;
(2) Use the amplitude of the display interface and related waveform diagrams during the detection process as auxiliary judgment methods.
Technical parameter
Ultrasonic sensor
Measurement range: 0~60dB μ V
Resolution: 0.1dB
Error: ± 1dB
Sensitivity: -70dB (capable of detecting discharge levels above 100pC (not less than 10cm))
Center frequency: 40kHz
Effective distance
10kV: detection distance of 15m
35kV: detection distance of 35m
110kV: detection distance 51m
Information output
Display screen: 3.5-inch 320 × 240 true color TFT touch screen
Earphone interface: 3.5mm jack, standard 16 Ω noise cancelling headphones
USB interface: USB flash drive, standard capacity 16GB
CPU
Collection speed: 10k/s; Acquisition accuracy: 16 bit AD
GPS
With up to 50 parallel channels, it can quickly search for stars; Adopting a passive ceramic antenna, it can directly receive GPS satellite signals; Equipped with IPX interface and expandable active antenna, suitable for use in vehicles. The shortest cold start time is only 27 seconds.
display mode
Real time mode, instantaneous mode, peak holding
Storage mode
Data DAT; Audio WAV;
sound recording
WAV format; Capable of recording audio with a sampling rate of 48kHz
The recording time is adjustable, with a default recording time of 10 seconds
Temperature -10 ºC~ 50 ºC± 2 ºC
Humidity ≤ 90% RH ± 4.5% RH
Storage capacity 16GB USB flash drive; At least 160k sets of data can be stored
Power Supply
DC3.7V lithium battery; Capacity of approximately 8000mAH; Full load operation, sustainable power supply for 8 hours;
Normal operation for 12 hours; Low power operation for 20 hours; Power consumption of 40uA in shutdown state
Audited Supplier 
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