Partial Discharge Detector for Overhead Line

Model: HJF-750

The Partial Discharge Detector HJF-750 is a handheld non-invasive tool for detecting partial discharge activities of MV and HV electrical equipment, especially for Overhead Line, Insulator, Arrester etc. in running state.

The HJF-750 can perform long-distance non-contact partial discharge detection, laser accurate positioning, maximum detection distance up to 30 meters. It also supports test on vehicles with a speed of 30km/h. With high sensitivity, strong directionality and directivity, the HJF-750 can accurately locate hidden faults of the overhead line without power outages. The ultrasonic test can be performed under noisy environment, not influenced by ambient sound.

Using rechargeable lithium battery as power supply, it can ensure the HJF-750 continues to work for more than 8 hours.

The HJF-750 is compact and light weight design, easy to carry, very suitable for live detection of outdoor overhead lines.

Main Features

●Portable design, small size, light weight, easy to carry

●4.3-inch touch screen for operation

●Able to detect open air electrical equipment, find and locate all kinds of partial discharge, such as corona, arc, flashover, creepage, wire break, arc pull etc.

●The camera and laser detector provide accurate positioning and easy focus to take photos of faulty equipment.

●The detected abnormal ultrasonic signal is converted into audible sound signal and waveform output.

●Embedded GPS receiver automatically stores coordinate data

●Able to test environmental temperature and humidity in real time

●Able to save data and play back data

●High sensitivity and directivity can accurately locate the overhead line fault.

●The test can be performed in a vehicle with a speed of 30km/h.

●Suitable for noise environment, not affected by environmental sound.

●No-contact testing(effective testing distance up to 30m) makes test much safer.

●Able to detect early fault phenomena before other detection methods such as infrared detection.

Technical Data

◇System: WINCE6.0

◇CPU: Main frequency 533MHz

◇Memory: RAM of 256MB DDR2, 1GB NandFlash

◇Screen: 4.3-inch TFT true color touch screen, resolution of 480x272

◇Interface: SD memory card, USB, serial port, earphones

◇SD Memory Card: 8GB

◇Camera: 3 mega-pixel high definition camera

◇Accessories: GPS, temperature /humidity measurement device, high brightness laser pointer

◇Storage function: GPS coordinate, date/time, temperature/humidity

◇Frequency range: 20-150kHz

◇Center frequency of sensor: 40kHz

◇General

●Power supply: built-in lithium battery, about 8 hours for continues work

●Charger of battery

Input: AC100-240V, 50/60Hz

Output: voltage 20V, current 3.25A

◇Environmental Conditions

●Storage temperature: -20°C to 70°C (-4°F to +158°F)

●Operating temperature: -20°C to +50°C (-4°F to +122°F)

●Humidity: < 95% RH, non-condensing

The Handheld Partial Discharge Detector HJF-750 is an indispensable professional inspection tool for transmission line maintenance personnel.

HAOMAI ELECTRIC TEST EQUIPMENT CO.,LTD, as a subsidiary of HAOMAI ELECTRIC POWER AUTOMATION CO.,LTD, located in Shenzhen of China, mainly focuses on the sales and services of Protection Relay Test Set, Instrument Transformer Test Set, CT/PT Analyzer, Power Transformer Test Set, Circuit Breaker Testing Equipment, Battery Testing Equipment, IEC 61850 Testing Equipment for Smart Substation, Partial Discharge Detector, Transformer Oil Dissolved Gas Analysis and Moisture Monitor etc. electrical test equipment and online monitoring equipment.

The headquarters, HAOMAI ELECTRIC POWER AUTOMATION is established in 1999 and located in Wuhan of China, which is specialized in developing and manufacturing electrical test equipment and online monitoring equipment. HAOMAI products are widely used in power grid, petrochemical, metallurgy, railway, coal mine, research institutes and all kinds of large-scale factories or enterprises.

HAOMAI follows total quality criteria, and always maintains standardized process and procedures for continuous growth. HAOMAI has been certified by ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018. All of HAOMAI products passed Type Test or Calibration in the third party laboratory accredited under ISO/IEC 17025.

HAOMAI builds own RELAYSTAR laboratory and performance test laboratory, and possesses professional production equipment and testing instruments in factory, such as Agilent 34401A 6 1/2 High-precision Meter, FLUKE Multi-meter, EMH Standard Meter, CLOU Standard Power Source, Oscilloscope, Phase Meter, Insulation Test System, High Voltage Dividers, AC High Voltage Generator, Time Calibration Tester, Standard Micro-resistance etc.

HAOMAI is China well-known mark recognized and approved by State Administration for Industry & Commerce of People's Republic of China, and enjoys high reputation in domestic and foreign markets.

HAOMAI now is the key supplier for SGCC(State Grid Corporation of China) and CSG(China Southern Power Grid). Till 2021 HAOMAI products have been sold to 39 different countries.

HAOMAI always sticks to the faith of "cooperation and sharing", takes the "technology and market" as the direction, "creation and innovation" as the soul, listens to clients carefully, and improves the technology, upgrades the products, optimizes the service and tries all to be the global leader in electrical test and measurement instruments field.