Cable Fault Pre-locator | XHGG501A2
The XHGG501A2 cable fault pre-locator is a specialized instrument for measuring and analyzing the condition and fault distance of power cables. It is applicable to low-resistance, short-circuit, open-circuit and broken-circuit faults in power cables, high-frequency coaxial cables, street light cables and buried wires of various cross-sections and media, as well as high-resistance leakage and high-resistance flashover faults. Technical parameters comply with GB/T 18268.1, DL/T 849.1-2019 and JJF1042-2020.
Based on an industrial-grade 12.1-inch touchscreen all-in-one computer, the instrument combines modern electronic and computer technologies to achieve signal filtering, acquisition, data processing, graphical display and graphical analysis, completing cable speed measurement, cable length testing and cable fault distance testing. The built-in high-capacity lithium-ion battery and industrial-grade integrated circuits ensure stability, reliability and ease of use in field conditions.
The XHGG501A2 is designed for underground power cable fault pre-location, providing a quick, accurate and safe measurement solution for power cables of different sections and media, including short-circuit, open-circuit and low and middle resistance faults, and is widely used in substation, civil power supply system and power energy source applications.
Applications & Target Audience: Engineered for cable management departments of process industries such as steel, cement and paper mills, traction power supply sections of electrified railways, overseas grid operators and power utilities, airport power management departments for approach lighting and power supply systems, electrical management teams of large commercial complexes and office buildings, and electromechanical departments of real estate development enterprises.
Key Specifications
| Parameter |
Specification |
| Sampling Frequency |
400 MHz |
| Low-voltage Pulse Amplitude |
400 V |
| Pulse Width |
0.25 μS / 2 μS / 4 μS |
| Minimum Resolution |
0.1 m |
| Test Blind Zone |
≤ 10 m |
| Distance Measurement Range |
≥ 68 km |
| Measurement Error |
≤ ±(0.5% × L + 1 m), L is the cable length |
| Test Cable Length Options |
<1 km (short), <3 km (medium), >3 km (long) |
| Display |
12.1-inch industrial-grade touchscreen all-in-one |
| Test Methods |
Low-voltage pulse method, high-voltage flashover method |
| Power Supply |
AC 110V ~ 240V, 50Hz/60Hz rechargeable; built-in 11.1V lithium battery |
| Operating Conditions |
-20 °C ~ +65 °C, relative humidity 90% |
| Standards |
GB/T 18268.1, DL/T 849.1-2019, JJF1042-2020 |
Product Features
12.1-inch industrial-grade computer control with touchscreen operation for clear waveform display
Functions of wave velocity measurement and fault distance measurement
Fully automatic continuous sampling ensures timely and accurate waveform capture
Latest embedded industrial control computer technology with both impulse high-voltage flashover method and low-voltage pulse method
User-friendly software with full Chinese menu and simplified touchscreen button definitions, simple and quick measurement
Built-in high-capacity lithium-ion battery with AC/DC dual power supply, suitable for field use
Three Testing Methods in One Instrument
The XHGG501A2 integrates three testing methods to cover different fault natures. Choosing the right method is the key to accurate pre-location.
| Method |
Typical Fault |
Principle |
| Low-voltage pulse method |
Low-resistance, short-circuit, open-circuit and broken-circuit faults |
Applies a low-voltage pulse signal to the cable; the pulse reflects at the fault point and the waveform shows the fault distance |
| High-voltage flashover method 1 (direct flashover) |
High-resistance flashover faults |
A DC high-voltage supply applies DC voltage until a sudden flashover discharge occurs at the fault point, generating a reflected signal received by the sampler |
| High-voltage flashover method 2 (impulse flashover, universal method) |
High-resistance leakage faults |
A high-voltage pulse signal source applies pulses that cause flashover discharge at the fault point; the reflected signal is sampled and analyzed |
Cable Fault Classification
Understanding the fault nature helps operators select the correct test method and interpret the waveform correctly.
| Fault Type |
Description |
Detection Method |
| Open-circuit fault |
Insulation normal but conductor broken, partially broken, or with excessive line resistance at a point |
Low-voltage pulse method; waveform shows the open end reflection |
| Low-resistance fault |
Insulation damaged forming a phase-to-phase or phase-to-ground path below several hundred ohms; zero ohms is a short-circuit fault |
Low-voltage pulse method directly |
| Leakage high-resistance fault |
Fixed resistance path of several hundred ohms or higher; leakage current increases continuously with applied DC voltage |
High-voltage flashover method (impulse flashover) |
| Flashover high-resistance fault |
Insulation damaged but no fixed resistance path; leakage current suddenly increases at a certain pre-test voltage |
High-voltage flashover method (direct flashover) |
Working Principle
The cable fault tester adopts the traveling wave method testing principle. In the low-voltage pulse method, a low-voltage pulse signal is applied to the cable under test. The pulse signal is reflected through the fault point, and the instrument processes the reflected signal to display a waveform. The coarse fault distance is determined by analyzing the reflected waveform.
In the high-voltage flashover method, a high-voltage signal is applied to the faulty cable. When the voltage reaches a certain value, a sudden flashover discharge occurs at the fault point, generating a reflected signal that is received by a dedicated sampler and transmitted to the instrument. The instrument processes the reflected signal and displays a waveform for fault distance analysis.
Test Procedure
The process of using the XHGG501A2 to locate faults in underground power cables generally involves the following steps.
Analyze the nature of the cable fault and understand the withstand voltage level and insulation medium of the faulty cable
Use the low-voltage pulse function to test the length of all phase wires of the faulty cable and calibrate the wave transmission speed of the faulty cable
Select a suitable test method and use the instrument to perform a rough test of the cable fault distance
Conduct precise measurement of the cable fault point, including locating the route and depth of buried cables and identifying the fault point
Conduct error analysis on the cable fault test results, considering measurement error, transmission speed error, interpretation error and instrument error
Software Interface
The main interface is divided into a working status indicator area, a waveform display area, an instrument parameter display area and a function setting area. The working status area shows whether the instrument is connected normally. The waveform display area shows the real-time waveform on the upper part and the compressed full picture on the lower part.
Cable types: cross-linked polyethylene cable, polyvinyl chloride cable, rubber-sheathed cable, oil-impregnated paper cable, and other types with customizable propagation speed
Three methods selectable: low-voltage pulse method, high-voltage flashover method 1, and high-voltage flashover method 2 (reserved)
Length options: <1 km, <3 km, >3 km for optimal sampling settings
Sampling control, open file, waveform comparison, wave velocity measurement and parameter simulation functions
Waveform printing and saved history waveforms for analysis and reporting
Panel Layout
| Panel Element |
Function |
| Display |
12.1-inch industrial-grade touchscreen |
| Communication interface |
Low-voltage pulse signal output; high-voltage flashover sampler signal input |
| Grounding terminal |
Safety grounding terminal |
| Battery level indicator |
Internal battery level in 4 bars |
| USB-1 / USB-2 |
External wireless network card and USB communication devices |
| Power switch |
"I" uses AC 220V, "II" uses internal battery (charges when AC connected), "O" turns off |
| Power socket & fuse |
AC 220V connection and fuse installation |
| Self-test |
Lower-level machine transmits a signal for checking |
| On/Off |
Turns the industrial computer power on and off |
| Amplitude knob |
Adjusts the amplitude of the acquired waveform |
| Displacement knob |
Adjusts the baseline height of the acquired waveform |
| Indicator lights |
Reflect the testing method in use |
Notes & Safety
Read the manual carefully before use; violent impacts to the instrument are strictly prohibited
Connect the test leads correctly, especially the grounding wire and the high-voltage wire
When connecting high-voltage flashover circuits, it is strictly forbidden to use the low-voltage pulse method in the instrument software
High-voltage flashover sampling is strictly prohibited while the instrument is charging
Charge the battery before use if it is low; if not used for a long time, charge every 2 months to prevent battery damage
FAQ
Q1: What is the XHGG501A2 cable fault pre-locator used for?
It is a specialized instrument for measuring and analyzing the condition and fault distance of power cables, applicable to low-resistance, short-circuit, open-circuit and broken-circuit faults, as well as high-resistance leakage and high-resistance flashover faults in various cables and buried wires.
Q2: What testing methods does it support?
It supports the low-voltage pulse method for low-resistance and open-circuit faults, the high-voltage flashover method 1 (direct flashover) for high-resistance flashover faults, and the high-voltage flashover method 2 (impulse flashover) for high-resistance leakage faults.
Q3: What is the maximum measuring distance and accuracy?
The distance measurement range is at least 68 km with a minimum resolution of 0.1 m and measurement error of no more than ±(0.5% × L + 1 m). The test blind zone is no more than 10 m.
Q4: What cables can it test?
It can test power cables of various cross-sections and media, high-frequency coaxial cables, street light cables and buried wires, including cross-linked polyethylene, PVC, rubber-sheathed and oil-impregnated paper cables, with selectable cable types and customizable wave propagation speed.
Q5: Why is the 12.1-inch touchscreen design important?
The industrial-grade touchscreen all-in-one computer provides a clear real-time waveform display and a simple operating software interface with full Chinese menu and touchscreen button operation, making human-machine interactive testing stable, reliable and easy to use in the field.
Every XHGG501A2 is delivered with the cable fault tester host, stylus, sampler, single-Q output cable, double-Q input cable and power cord, and is backed by one-year free warranty and lifetime maintenance and technical service. For ordering, training and after-sales support, please contact our sales team.
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