China Ground Fault Finder Equipment DC System Earth Fault Tester
Overview
This product collects DC system ground fault locating devices from major manufacturers at home and abroad, discarding the disadvantages and adopting the best ones. According to the latest standards of the electricity and power industry, the touch screen-based method replaces the traditional button operation. It is an ideal product for the new generation of DC ground fault locating .
DC system insulation faults, DC crossover faults and AC crossover faults are prone to occur and are more harmful to the power system, jeopardizing the normal operation of the power system. At present, the core problem of DC power supply grounding fault finding in power system is the large field interference. The measurement under different DC power sources and different working conditions has poor anti-interference performance, which leads to mismeasurement and misjudgment of many products. This is the biggest shortcoming of this series of products, and it is also the most common phenomenon.
In order to better help on-site maintenance personnel to find DC faults quickly and accurately, our company has developed a DC ground fault finder through years of hard work and summed up a lot of on-site experience.
The DC ground fault finder adopts a high-precision current clamp meter, uses the DC current difference in the fault circuit to find and locate the fault, introduces the fast FFT transformation technology into the DC fault finder, and can detect various voltage levels (24V, 48V , 110V, 220V) various insulation faults, DC mutual channeling faults, and AC channeling faults in the DC system. The instrument has the characteristics of high detection sensitivity, strong anti-interference ability, small size, light weight, and convenient use. When looking for the grounding fault of the DC system, it is not necessary to disconnect the power supply, and the grounding point can be located. The instrument can detect the grounding resistance and grounding direction of the DC system, and provide a suitable and reliable high-accuracy detection instrument for the search and location of the ground fault in the power DC system.
As the power system has higher and higher requirements for safe operation, the requirements for various types of DC fault finding in the power system will also become higher and higher. Find the basic requirements of the instrument.
The new DC ground fault finder based on the principle of DC current difference detection introduces fast FFT transformation technology, through the detailed analysis of the amplitude-frequency characteristics of the detected value, it balances the contradiction between the safety and sensitivity of DC ground fault detection, and pushes the DC ground fault technology forward. It has reached a new height and has broad application prospects.
2. Main features of the product
1. The instrument is divided into a signal transmitter (analyzer) and a receiver (locator). The analyzer takes power directly from the bus, without external AC or battery power supply, and the operation is more convenient;
2. Solve the virtual grounding with poor insulation state, high resistance grounding, multi-point grounding, single-point grounding, small resistance grounding, direct grounding, mixed line grounding, loop grounding, capacitor grounding, AC channeling grounding, transistor isolation grounding wait for all failures;
3. Completely eliminate the grounding fault of the DC system, without being disturbed by the large capacitance distributed on site, and accurately lock and locate the fault within the minimum range;
4. Accurately indicate the current direction of the grounding signal, and quickly find the grounding fault point;
5. With voice broadcast grounding status and grounding direction;
6. Accurately detect the size and phase of the leakage current of the line, and quickly and accurately locate the fault point according to the size and phase change of the leakage current before and after the ground fault point;
7. DC systems below 300V share a set of DC grounding analyzers, and there are no other special requirements for DC voltage;
7. Full touch screen intelligent design, more convenient to use, no need for button control, the maximum current of the signal source is less than 800uA , with built-in current limiting protection, which has no effect on relay protection, automation devices, and operating circuits, and is safe to use ;
8. Ripple analysis and digital oscilloscope function: use the spectrum analysis function to solve various interference signals, and check the waveform information of various detection signals and circuits;
9. Intelligent current clamp, automatically detects the open and closed state of the current clamp, and the large and small jaws are common;
10. It can adapt to the grounding caused by AC and DC channeling, the grounding of the ring network power supply, the grounding of the diode isolation power supply, and the high-impedance grounding;
11. It can solve the fault of direct current mutual channeling of the same pole and different polarity, and select the fault branch of mutual channeling;
12. To meet different specifications and different ground capacitance station power supplies, to detect the bus capacitance value;
13. No need for installation, no power outage, no wire throwing, no need to untangle the wire, no need to shake the insulation, and quickly locate the ground fault;
14. Humanized intelligent touch interface, easy to operate, luxurious outer packaging, easy to carry.
3. Technical parameters
3.1 Analyzer
Working voltage: take power directly from the busbar (working voltage is 24 V ~ 280V)
Voltage measurement range: 0-300V
Voltage measurement accuracy: 0.5%
Bridge working mode: unbalanced bridge
Maximum detection signal power : <0.01W,
Signal power supply maximum current: ≤ 800uA
Signal frequency: ≤0.5Hz
System-to-ground voltage fluctuation: ≤10%Un
Busbar grounding resistance detection range: 0-999.9 kΩ
Busbar grounding resistance measurement accuracy: ≤5%
Resistance measurement resolution: 0. 01 kΩ
AC break-in voltage measurement range: 0-250V
AC creep-in voltage measurement accuracy: ≤ 2 %
Battery ground measurement error (2V): ≤ 3 cells
Power consumption: less than 10W
Dimensions (length × width × height): 200*145*46 (mm)
Weight: 1. 7kg
Suitable temperature: -10ºC-+50ºC
3. 2 Locator
Working voltage: 3.7 V (Lithium battery works, the working voltage is 3.2 V ~ 4.2 V , similar to mobile phones )
Working method: touch screen
Branch grounding resistance detection range: 0-999 kΩ ( factory default setting is 300 kΩ )
Branch grounding resistance measurement accuracy: 0-150 KΩ ( ≤10 % ± 2 kΩ ) , 150-999 kΩ display specific value
Ground resistance measurement resolution: 0.1KΩ
Leakage current detection sensitivity: ≤0.1 uA
Measurement accuracy: 100%
Alarm mode: graphics, data, grounding direction
Voice alarm: grounding, mutual channeling, measured value, fault direction and other information
Waveform display: standard sine wave (similar to oscilloscope)
Pliers Judgment: Automatic identification of large and small pliers, opening and closing state
Continuous working time : more than 10h
Dimensions (length × width × height): 180*100*40 (mm)
Weight: 1.5kg
Suitable temperature: -10ºC-+50ºC
Working power supply: lithium battery power supply ( 3.7 V 40 00mAh rechargeable)
Company Information
HuaZheng Electric Manufacturing (Baoding) Co.,Ltd is the supplier of the State Grid in China.It means we are the supplier of the Chinese Government.And our products spread throughout the whole China.
What's more, our customers come from different countries like America, England, Bulgaria, Brazil, Chile, Malysia, Vietnam and so on.
Our main products are Insulation Oil Tester, Cable Fault Locator, Power Quality Analyzer, High Voltage Generator, High Voltage Capacitor, Testing Transformer and so on. |
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