SFJ044 Variable Frequency High-Current Multifunctional Ground Impedance Test System
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
SFJ946 DC System Earthing Fault Testing Instrument
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
SFJ1001 Large Ground Screen Grounding Resistance Tester
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.
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
SFJ044 Variable Frequency High-Current Multifunctional Ground Impedance Test System
Top
