Cable Fault Pre-Locator XHGG502 12.1-Inch Touch TDR Tester 400MHz Sampling 68km Ranging with Pulse Coupler for Underground Power Cable Fault Location | XHGG502

Cable Fault Pre-Locator | TDR Time Domain Reflectometer | XHGG502

The XHGG502 cable fault pre-locator adopts an industrial-grade 12.1-inch touch all-in-one computer and a simple operating software interface to realize human-computer interaction testing. Using industrial-grade integrated circuits and devices with a built-in large-capacity lithium-ion battery, it is stable, reliable and easy to use.

This cable fault pre-locator is a special instrument for measuring and analyzing power cable status and fault distance. It combines modern electronic technology and computer technology to realize signal filtering, acquisition, data processing, graphic display and graphic analysis, completing cable speed measurement, cable length testing and cable fault distance testing. It is suitable for low-resistance, short-circuit, open-circuit and disconnection faults of power cables, high-frequency coaxial cables, street light cables and buried wires of various materials with different sections and different media, as well as high-resistance leakage and high-resistance flashover faults. The technical parameters meet the requirements of GB/T 18268.1, DL/T 849.1-2019 and JJF1042-2020 standards.

Applications & Target Audience: Built for power cable manufacturers (factory acceptance and quality control), street lighting and municipal utility maintenance departments, mining and metallurgy enterprise electrical maintenance teams, and electric power vocational training institutions that need to quickly pre-locate low-resistance, open-circuit, high-resistance leakage and flashover faults on 35kV and below power cables, high-frequency coaxial cables and buried wires.

Key Features

★ 12.1-inch industrial-grade computer control with touch operation mode;

★ XP operating system with convenient operation mode;

★ Built-in functions of measuring wave speed and fault distance;

★ Fully automatic continuous sampling, timely and accurate waveform capture;

★ Latest embedded industrial computer technology with the world's most advanced "eight pulse method" (multiple pulse method) test technology, plus shock high-voltage flashover method and low-voltage pulse method;

★ Any high-resistance fault presents the simplest waveform characteristics similar to the low-voltage pulse short-circuit fault, which is very easy to interpret;

★ User-friendly software with full menu and on-screen touch key operation, simple and fast measurement;

★ Fault detection success rate, test accuracy and test convenience better than any domestic testing equipment;

★ Ultra-high brightness large LCD screen as display terminal, clearly observable in direct sunlight, with powerful data processing capability and friendly display interface;

★ The reflected signal sent by the pulse coupler is automatically displayed together with the full-length waveform of the cable open circuit, making fault characteristic waveform representation extremely simple - only one high-resistance fault waveform similar to the low-voltage pulse short-circuit waveform, with automatic fault distance display;

★ Massive waveform storage: on-site waveforms can be stored in the specified order and called at any time;

★ Standard USB interface, simple operation and high reliability with very high cost performance;

★ Built-in polymer lithium battery power supply, which can test cable open circuit and low-resistance short-circuit faults in a no-power-supply environment.

Technical Specifications

Working Principle

The cable fault pre-locator adopts the principle of the traveling wave method. When the electric wave is transmitted in the transmission line, if the characteristic impedance of a certain point changes, the electric wave will not only continue to transmit farther, but also be reflected back to the test end. This reversely transmitted radio wave is called the reflected wave. The polarity of the echo at the short-circuit point is opposite to that of the transmitted pulse, while the polarity of the echo at the open-circuit point (including the cable end) is the same as that of the transmitted pulse. For general low-resistance and open-circuit faults, the distance between the fault point and the test terminal can be easily determined according to the polarity of the echo.

Low-Voltage Pulse Method

The low-voltage pulse method is used to test low-resistance, short-circuit, open-circuit and disconnection faults. During the test, it must be confirmed that there is no electricity stored in the cable body. Select the cable type, detection method and test length range, wire according to the low-voltage pulse wiring diagram, click "Sample" to capture the waveform, and adjust "Displacement" and "Amplitude" to make the waveform distinguishable for fault distance measurement.

High-Voltage Flashover Method

The high-voltage flashover method is used to test high-resistance leakage and flashover faults. The wiring can be divided into split-type (DC high-voltage power supply or operation box + test transformer, with high-voltage capacitor and spherical gap) and integrated-type (high-voltage pulse generator or wheeled high-voltage pulse generator). It is strictly forbidden to use AC 220V power supply for high-voltage flashover sampling test, and it is strictly prohibited to connect the sampler to the fault tester while the software is in low-voltage pulse mode.

Multiple Pulse Method

The multiple pulse method adopts the world's most advanced "eight pulse method" test technology. The pulse coupler can withstand DC 35kV, and the reflected signal sent by the pulse coupler is automatically displayed together with the full-length waveform of the cable open circuit. Any high-resistance fault presents the simplest waveform characteristics similar to the low-voltage pulse short-circuit fault, which is very easy to interpret and automatically displays the fault distance.

Instrument Composition

• Cable fault tester: a unit that tests and analyzes cables by using low-voltage pulse method, high-voltage flashover method and multiple pulse method;

• Coupler: used in the multiple pulse method;

• Stylus: easy to operate and touch the integrated screen, precise positioning and selection of the display area;

• Output line (1.5m single Q line): connects the cable fault tester and the tested cable in the low-voltage pulse test method;

• Input line (2m double Q line): connects the cable fault tester and the sampler in the high-voltage flashover test method;

• Sampler: in the high-voltage flashover method, it receives the signal reflected from the high-voltage signal to the sampling ground;

• Power cord (1.8m): cable fault tester charging cable;

• Coupler high-voltage line A (2m): connects the coupler and the cable under test in the multiple pulse method, plug in and out only during wiring, cannot be rotated or twisted;

• Coupler high-voltage line B (2m): connects the coupler and the high-voltage pulse signal source in the multiple pulse method, plug in and out only during wiring, cannot be rotated or twisted;

• Ground wire (2.5m): coupler ground wire.

Operation Interface

1 Display: 12.1-inch industrial-grade touch screen;

2 Communication: low-voltage pulse method pulse signal output interface, high-voltage flashover method sampler receiving signal input interface;

3 Grounding: safety grounding terminal;

4 Power indicator: indicates the internal battery power, displayed in 4 grids;

5 USB-1: external wireless network card and USB communication device;

6 USB-2: external wireless network card and USB communication device;

7 Power switch: "I" position uses AC 220V power supply to supply power to the system; "II" position uses the internal battery to power the system, and charges the battery at the same time when the power socket is connected to AC 220V; "O" position turns off the system power;

8 Power socket: working power supply of the instrument, AC 220V connection port;

9 Fuse: the place where the fuse of the AC 220V power supply system is installed;

10 Self-check: transmits signals under multiple pulses;

11 On/Off: turns on and off the working power of the industrial computer;

12 Amplitude: adjusts the amplitude knob when collecting waveforms to change the amplitude of the collected waveforms;

13 Indicator light: the indicator light reflecting the inspection method;

14 Displacement: adjusts the displacement knob when acquiring waveforms to change the baseline height of the acquired waveforms.

Software Operation Interface

Double-click the "Cable Fault Tester" shortcut on the desktop to start the program, and the main menu of the program is displayed. In the function setting area of the main interface, select the cable type, detection method (low-voltage pulse, high-voltage flashover or multiple pulse method) and the appropriate test length range. Click the "Sampling" button to enter the testing and waveform processing interface, adjust the "Vertical Displacement" and "Input Amplitude" knobs according to the waveform needs, and observe the collected echo so that the waveform does not have upper and lower amplitude limits until the amplitude and displacement of the echo are suitable for analysis. Press the "Expand" or "Compress" key to make the tested waveform width more suitable for the interpretation of fault distance, and press the "Close, Separate" keys to overlap the upper and lower waveforms - the part before the fault echo overlaps well, while the part of the waveform after the fault echo has obvious divergence.

Why Choose the XHGG502 Cable Fault Pre-Locator

The XHGG502 combines the world's most advanced multiple pulse test technology with an industrial-grade 12.1-inch touch all-in-one computer, giving field engineers a decisive advantage over conventional cable fault testers - from simpler waveform interpretation to faster on-site testing and more reliable fault distance measurement.

FAQ

Q1: Who is this cable fault pre-locator designed for?

It is designed for power cable manufacturers (factory acceptance and quality control), street lighting and municipal utility maintenance departments, mining and metallurgy enterprise electrical maintenance teams, and electric power vocational training institutions that need to quickly pre-locate faults on power cables, high-frequency coaxial cables and buried wires.

Q2: What cable fault types can the XHGG502 test?

It tests low-resistance, short-circuit, open-circuit and disconnection faults, as well as high-resistance leakage and high-resistance flashover faults of power cables, high-frequency coaxial cables, street light cables and buried wires of various materials with different sections and different media.

Q3: What test methods does the XHGG502 support?

It supports three test methods: the low-voltage pulse method, the high-voltage flashover method, and the multiple pulse method (the world's most advanced "eight pulse method"). The pulse coupler withstands DC 35kV and automatically displays the reflected signal together with the full-length waveform of the cable open circuit.

Q4: What is the ranging range and measurement accuracy?

The ranging range is ≥68km with a minimum resolution of 0.1m and a measurement error of ≤±(0.5%×L+1m), where L is the cable length. Three test length ranges are available: <1km (short distance), <3km (medium distance) and >3km (long distance).

Q5: What is included in the standard package?

The standard package includes the cable fault tester, pulse coupler, stylus, output line (1.5m), input line (2m), sampler, power cord (1.8m), coupler high-voltage lines A and B (2m each), and ground wire (2.5m).

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