Xzh Test Factory New Underground Cable Fault Pre-Locator Tdr Three Phase Test for Cable Factory

XHGG501X  tdr underground cable fault locator is designed for underground power cable fault pre-locating, cable length measurement , especial suitable for cable factory to test cable length in drum.

1. The instrument realizes that the ABC three-phase cables are sampled separately, and the sampled waveforms are displayed on the screen at the same time, so that the waveforms of the three-phase cables can be compared.
2 The instrument adopts high-speed sampling, narrow output pulse, and small blind area, which is suitable for the application of short cables.
3. The instrument has the functions of output pulse sampling speed self-adaptation and waveform automatic analysis, and the application is simple.


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1 The longest test length: 20.8km
2 The shortest test length: 10m
3 Sampling speed: 10MHz, 20MHz, 50MHz, 100MHz, 200MHz.
4 Pulse width: 1us, 0.75us, 0.5us, 0.2us, 0.1us
5 pulse width: 440V
6 System test accuracy is less than 0.1m
7 Built-in power supply: It can work continuously for 8 hours after being fully charged, and can also work with external AC power supply
8 Working conditions: temperature 0ºC~+45ºC, relative humidity 70%, atmospheric pressure 750±30mmHg

Working principle

1. Traveling wave method: When the electric wave is transmitted in the transmission line, if the transmission line is uneven, that is, the characteristic impedance of a certain point in the transmission line changes, when the electric wave is transmitted to this point, the electric wave will not only continue to transmit to the load, but also produce a reverse direction After transmission and back to the test end, we call this reversely transmitted electric wave a reflected wave, and the phenomenon that the electric wave is transmitted in the opposite direction is called the reflection phenomenon of the electric wave. The so-called traveling wave refers to the general term of the incident wave and the reflected wave.

2. When the electric wave is transmitted in the transmission line, the polarity of the echo at the short-circuit point is opposite to that of the transmitted pulse, and the polarity of the echo at the break point (including the cable terminal) is the same as that of the transmitted pulse. Using the pulse method, the instrument can easily judge the distance from the fault point to the test terminal according to the polarity of the echo.

3. The cable fault tester applies a low-voltage pulse signal to the cable under test. The pulse signal passes through the fault point of the cable to generate a reflected signal. The cable fault tester processes the reflected signal and presents a waveform diagram. The approximate fault distance of the cable under test is judged by analyzing the reflected waveform. The wiring is shown in the figure below.


Panel layout and function schematic diagram

1 LCD: interface display;
2. Signal: connect the signal output cable;
3 Charging: Connect the charger to charge the instrument;
4 Amplitude: Amplitude potentiometer to adjust the sampling amplitude;
5 Switch: Power switch.


System show



1 Waveform display area: it can display the sampling waveform of ABC three-phase cable at the same time;
2 Current moving cursor: the currently movable cursor is displayed in black;
3 Fixed position cursor: After the cursor moves to determine the position, the fixed position cannot be moved. These two cursors are switched by the "OK" button;
4 Test results: the data is calculated and set according to the distance of the cursor, and the data changes accordingly when the cursor is automatically analyzed and moved after sampling;
5 Media speed selection or setting: select the media speed corresponding to the cable type;
6 Cable length setting: After setting the cable length, the output pulse width and sampling speed will be automatically set;
7 Current sampling phase settings, ABC three-phase cycle;
8 Document processing: reserved;
9 Waveform expansion/waveform movement: the two functions are switched to each other;
10 Move up the waveform: move up the waveform in the hold state;
11 Waveform Compression/Waveform Left Shift: Waveform processing in hold state;
12 Waveform expansion/waveform right shift: perform waveform processing in the holding state;
13 Waveform recovery: display the phase of the current waveform;
14 Waveform down: move the waveform down in the hold state;
15 step length selection: when the cursor moves, select the moving distance at a time;
16 Move the cursor to the left: control the cursor to move to the left in the hold state;
17 Move the cursor to the right: control the cursor to move to the left in the hold state;
18 OK: After the cursor movement is confirmed, switch the cursor to another one;
19 Automatic analysis: After analyzing the current waveform, determine the positions of the two cursors;
20 sample/hold: status prompt;
21 sample/hold: state switching;
22 Move up the baseline: the overall sampling waveform is moved up, and the sampling state is valid;
23 Baseline down: the overall sampling waveform is moved down, and the sampling state is valid;
24 Amplitude reduction: the sampling amplitude is reduced, and the sampling state is valid;
25 Amplitude increase: the sampling amplitude increases, and the sampling state is valid;
26 Battery level: Display the current battery level.


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