Underground Cable Fault Detector

I. Product introduction

The underground Cable fault detector caters to the industrial-grade power industry solutions and the rapid development of the IT era. The limitations of the original intelligent pulse underground Cable fault detector are systematized by industrial embedded computer platform systems, network service businesses, and USB communication technology, which greatly improves The use function and utilization value of the instrument and convenient on-site environment operation are improved. The test software automatically recognizes the card position to read the fault distance, especially for the increasing number of buried cable faults, and provides a unique set of multi-scheme service methods and management learning software. The system is composed of a test host, a fault locator and a cable path meter. It is used for testing various faults of power cables, detecting cable paths and cable buried depths, and accurately testing faults of railway and airport signal control cables and street light cables.

II. Product features

◆ Leading domestic use of industrial control embedded computer platform system, full computer Win7 system operating platform, integrated software testing, and equipped with cable fault testing software.

◆ The domestic leader adopts 12.1in large screen, touch mouse operation, high-bright screen display, suitable for outdoor use in the sun, lithium battery power supply, convenient on-site testing; engineering plastic case, shock-proof and moisture-proof to achieve extremely strong stability.

◆Using the latest USB communication interface, the collected signal is stable, the host can automatically select eight sampling frequencies as low as 3.125MHz and up to 250MHz, adaptive pulse width, can meet the test requirements of different length cables, reduce rough measurement errors, and improve Test accuracy.

◆ The software realizes automatic identification and search of low-voltage pulse waveforms, automatic positioning of the inflection point of the waveform fault, automatic reading and display of the fault distance instrument, and two areas of the same screen displaying the waveform, realizing two modes of automatic and manual processing, making the waveform achieve dual cards Position operation, double cursor movement can be accurate to 0.15 meters, which improves the rough measurement accuracy and reduces the waveform error.

◆ The host supports its own WIFI receiving function, which can realize the expert remote on-site real-time test technical service at any time, and the expert remotely controls the user host. The business technology is equipped with phone Android version test software, which provides users with timely and accurate waveform analysis and communication guidance for on-site testing anytime, anywhere , Make you worry-free work.

◆ The key precision point meter part can directly digitally display the distance between the tester and the fault point. The use of background noise reduction technology is another innovation of similar fixed point technology in China. It provides a powerful guarantee for quickly and accurately finding cable faults and reducing power outage losses.

◆ Three types of high-voltage discharge parts are available for users to choose. The domestic leading brand-new high-frequency high-voltage power supply replaces the 65kg test transformer and operating box, and the built-in capacitor integrated high-frequency high-voltage power supply high-voltage impact part has a wide range of applications, is truly comprehensive and portable, leading the country .

III. Test index

1. It can test various faults of power cables with different voltage levels, different cross-sections, different media and various materials below 35KV, including: open circuit, short circuit, low resistance, high resistance leakage, high resistance flashover fault.

2. It can test various types of failures of railway communication control cables, street light cables, and airport signal cables.

3. It can measure the electric wave propagation speed of cables with a known length.

4. The buried path and depth of power cables can be tested.

Display mode: 12.1-inch industrial-grade LCD screen Storage space: fixed 32G

Test method: low-voltage pulse method, flash current method Operation mode: touch mouse operation

Test distance: not less than 60km The shortest test distance (blind area): 0-5 meters or no blind area

Precise point error: ±0.2m Test error: System error is less than ±1%

Resolution: V/fm; V is the wave velocity in m/μs; the software cursor is 0.10 meters.

Sampling frequency: 3.125MHz, 6.25MHz, 12.5MHz, 25MHz, 50MHz, 100MHz, 200MHz, 250MHz

Pulse width: 50ns, 80ns, 100ns, 200ns, 1μs, 2μs, 5μs, 10μs (software automatic matching) Power supply and power consumption: 　　AC　220V±10%　not more than 15W　　　DC　12V(7AH)　not more than 20W

Standby time: It can be used continuously for about 6 hours. Host weight: 6.2kg

Dimensions: 180mm×300mm×400m Temperature -20℃～﹢40℃, relative humidity 80%.

IV.Underground Cable fault detector software introduction

Press the "Cable Failure Test" button, the system enters the test panel, the test panel can be divided into four parts: menu bar, status bar, graphic display area, function key area.

Software test interface diagram

The red mark is a single-screen display button, and the upper part is a real-time waveform. The lower part is the manual analysis area. Double-click the upper waveform to load the lower manual analysis area.

1. The menu bar

The menu bar includes two menus:

"Data Management" menu: including, "Open File" and "Save File" two menu items.

Select "Open File" to retrieve the waveforms stored in the disk during the previous test; select "Save File" to store the tested waveforms and data in the computer as saved data.

"Report generation" can form a "cable fault test report" format from the screen display, select "print" or "close" to complete the work you want; select "save" to store the tested waveforms and data in the computer Save as data in hard disk or floppy disk;

2. Work status bar

Five pieces of information are displayed in the working status bar: displayed in sequence on the right side of the screen, "Sampling Frequency", "Test Mode", "Radio Wave Speed", "Distance to Failure", and "Test Date". During the test, the above data will be automatically linked according to your test selection and automatically displayed in the "automatic waveform area" and "manual waveform area".

3. Waveform display area

The waveform display area is used to display the sampled waveform. It is divided into "automatic waveform area" and "manual waveform area". This software uses special technology. The "automatic waveform area" will automatically optimize a waveform during testing. The low-voltage pulse method is used to test It will automatically lock the position and automatically calculate the distance to the fault. The high-pressure flash method test does not have this function. But select a waveform in the "automatic waveform area" and double-click it to immediately show the waveform in the "manual waveform area", where you can analyze and process and get stuck. The first cursor line is the initial positioning cursor, and the second cursor is the end card position cursor. When the mouse is clicked to the inflection point, the cursor line will move to the clicked place, and the distance will come out immediately. The fault distance is directly displayed in the small grid of the cursor line.

4. Function key area

　　The function key area is displayed at the bottom of the screen. It consists of 8 keys, each of which performs a certain function. The functions of these 8 function keys are as follows:

　　◆ "Test Setting" button: used during system testing: Click to select the corresponding "Test Mode", "Range and Sampling Frequency", and "Speed Medium Selection" according to the cable to be tested, and then click the option. Window menu: It includes two sub-menus: "Failure Test" and "Speed Test". Each menu item is selected to correspond to a test method. You need to enter the length of the cable when selecting "speed measurement".

"Sampling method" menu: includes two sub-menus: "low pressure pulse" and "high pressure flash method".

The "test range (sampling frequency)" corresponds to the following eight types: you only need to select the item corresponding to the approximate length of the cable under test, and you also select the corresponding sampling frequency, so that the sampling automatically adapts to the pulse width, and the resulting waveform is more standard , The inflection point is more clear.

The approximate length ranges available are:

●5m-100m　　 sampling frequency 250MHz

●20m-300m sampling frequency 200MHz

●100m-600m sampling frequency 100MHz

●500m-1200m sampling frequency 50MHz

●1.0Km-2.5Km sampling frequency 25MHz

●2.4Km-5.0Km sampling frequency 12.5MHz

●4.5Km-50Km sampling frequency 6.25MHz

●49Km-100Km sampling frequency 3.125MHz

The test distance "medium selection" menu includes:

●Oil-impregnated paper type: V=160m/μS

●Non-drip type: V=144m/μS

●Cross-linked ethylene: V=172m/μS

●Polyvinyl chloride: V=184m/μS

●Optional medium V=***m/μS

There are eight menu items, and selecting one of them is equivalent to selecting a speed. The medium can be added according to the user's special cable. If the electric wave speed of the cable you measured is not in the above four types, please input the electric wave speed of the self-selected medium.

When inputting, please click the #keypad at the bottom left of the test software interface (this machine has been set for you when it leaves the factory), and input the radio wave speed of your choice.

◆"Single, continuous" setting button: Click to select. In a single time, each time you click the sample button, the waveform will be sampled once. If you click the sample button once in the continuous state, the waveform will appear continuously.

◆"Sync" button, when analyzing the waveform jam position, when you want to compare the waveforms in the upper and lower waveform areas, press the "Sync" button, the two waveforms will automatically return to the initial position, the ratio is the same, you can re-compare and find What do you think is a more accurate turning point.

◆ "Sampling" key: Use this key during system testing. Each time you press the "Sampling" key, the system will collect data once, and you can draw a waveform in the graph display area and display it in the automatic waveform area on the upper screen in turn.

◆"Expａnd (auto area) compression" key, the error is greater when using compressed waveforms to calculate the distance. Press this key to expａnd the state of the waveform displayed in the "automatic waveform area" and display the full picture of the waveform, so that the inflection point of the card is more accurate and the error smaller. Each time you click the red mark,

the waveform expands, and it can expａnd continuously until you feel the card position is right.

◆"Extend (manual area) compression" key, the error is larger when using compressed waveform to calculate distance. Press this key to expａnd the state of the waveform displayed in the "manual waveform area" and display the full picture of the waveform, so that the inflection point of the card is more accurate and the error smaller. Each time you click the red mark, the waveform expands, and it can expａnd continuously until you feel the card position is right.

◆"Fine adjustment left" button, when analyzing the stuck position in the "manual waveform area", when you click on the cursor line with the mouse, it may not be stuck at the inflection point of the position you selected at a time. Using the "fine adjustment" key can help you adjust the starting point. , The end point of the cursor line is accurately moved to the inflection point that you think is more accurate. It greatly reduces the man-made error during the card position, and provides a more accurate distance for the second step to accurately determine the point.

◆"Fine adjustment right" button, when analyzing the waveform jam position, when you drag the cursor line with the mouse, it may not be stuck at the inflection point of the position you selected at a time. Using the "fine adjustment" key can help you to swim between the starting point and the end point. The markings move precisely until you reach the inflection point that you think is more accurate. It greatly reduces the man-made error during the card position, and provides a more accurate distance for the second step to accurately determine the point.

◆ "Exit" key, exit key when analyzing and processing waveforms, exit the test software.