SFJ044 Variable Frequency High-Current Multifunctional Ground Impedance Test System

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Introduction

The system complies with DL/T621-1997 standards of Grounding of AC Electrical Equipment , used to test grounding system, connected resistance and soil resistivity of large power plants and substations. It makes up for the defect of traditional measuring approaches, offering complete test items and reliable test for large grounding system

  • Multifunction: the system could test ground impedance of grounding system, as well as soil resistivity and connected resistance.
  • Strong anti-interference ability: the system used variable frequency, avoiding interference of 50Hz power frequency. The anti-interference ability is very strong
  • Flow injection frequency is adjustable, thus the system can acquire the frequency characteristics of the grounding system
  • Output waveform is sine wave, waveform distortion <1%
  • Large screen display of test data, test status, with real-time prompts
  • The flexibility to set the test current, frequency range, auto / manual switch of voltage and current regulation
  • High resolution, especially for large grounding grid (0.5Ω), the measurement accuracy is higher than similar products
  • With over current, overheat protection function

Technical Parameters

  • Input voltage;AC  220V 50Hz              
  • Resolution:0.001Ω
  • Output test voltage:0~1000V
  • measuring accuracy:Grade 1.0
  • Output test current :0~10A                 
  • Ambient temperature:-25℃~+50℃
  • Frequency adjustment range:30~120 Hz       
  • Humidity:≤90%
  • Waveform deviation:  1%                   
  • Altitude: ≤2000M
  • Voltage stage test voltage:0~50V(or 0~100V)
    Output high current:0~100A(connected resistance measurement)
    measuring range:0.1~99.999Ω
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SFJ946 DC System Earthing Fault Testing Instrument

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Introduction

SF9046 DC system earthing fault testing instrument is suitable to test DC system of any voltage class. It is equipped with high accuracy clamp meter, process various signals in high efficiency, thus to enlarge the testing range and improve the anti-interference capacity. The instrument takes advantage of fuzzy control theory of computation to show in numbers superiority of the tested insulating circuit branch. This embodies the intelligent advantage. This instrument could locate earthing point precisely. It is suitable to search the earthing point of power plant DC system and substation DC system while the power is on. Its accuracy could be up to 100%.

It is suitable to operate in various DC systems of 220V, 110V, 48V, 24V.

Technical Parameters

  • Signal generator
    Output signal frequency:2.5Hz± 2% 
    Signal no-load output voltage: 0~20V effective value
    Signal voltage amplitude error:﹤5%    
    delivery outlet anti-surge capability:400V DC surge
    Power voltage:AC220v±10%    
    Voltage frequency:50 Hz± 5%
    Input insurance:2A
  • Signal receiver
    Signal current inspection sensitivity:0.5mA 
    Receiver display:number 0~19
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SFJ1001 Large Ground Screen Grounding Resistance Tester

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Introduction

Large ground screen grounding resistance test uses power frequency high current three electrode method and new signal power source. It also uses computer process & control, signal process as anti-interference measures. This simplified the operation and enhance precision and accuracy of test.

Technical Parameters

  • Measuring range:0~15Ω
  • Measuring accuracy:3%
  • Measurement output current:AC<3A
  • Measuring circuit:≥Φ1.2MM2
  • Power supply:AC220V/50Hz
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SFJ7009 Down Lead Conduction tester

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Introduction

  • High-speed A/D converter and programmable current source technology, high accuracy, stable data and good repeatability.
  • Large test current, up to 10A, to eliminate influence from contact resistance
  • High accuracy, resolution 1μΩ
  • Test time is short, only 3s
  • Can long time test down lead conduction for unlimited equipment, satisfying needs of multiple substations
  • Large-screen LCD, user-friendly interface
  • Automatic short circuit protection, overtime protection and misoperation protection  to ensure the safety of personnel and instrument
  • All intelligent, automatic range switching, easy operation

Technical Parameters

  • Power supply:AC 220V,50Hz
  • Measuring range:1mΩ~100Ω
  • Resolution:1µΩ
  • Measuring time:≤3S
  • Accuracy:≤0.5%
  • Test current:100mA, 1A, 5A, 10A
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SFJ8002 Grounding Wire Group DC Resistance Tester

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Introduction

The apparatus test group DC resistance for portable short-circuit grounding wires and protective grounding wire. It is used to assess the contact between the grounding wires closed converge folder and multi-strand copper wires. Meanwhile it could assess the cross section of multi-strand copper wires.

  • Easy-operating, intuitive data display
  • Superior anti-interference ability, strong stability
  • High brightness digital display
  • Flexible Circuit switching
  • Special chuck, easy assemble and disassemble

Technical Parameters

  • Input Power:220v±10%,50Hz
  • Resolution:0.1µΩ
  • Output Current:35A
  • Digital ohmmeter range:100µΩ~200mΩ
  • Working time: intermittent type
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manufactures and sells high voltage electric equipment. Our main products include high voltage complete test systems, testing instruments.

 

Vista & Mission

manufactures and sells high voltage electric equipment. Our main products include high voltage complete test systems, testing instruments.

 

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power transformer test system, instrument transformer test system, PD test system, various AC test systems, series resonant test system, impulse voltage/current test system, high voltage capacitive bridge, series high voltage standard capacitors, etc.