Product Overview
The XHDD503 and XHGG502 portable cable fault locator is a matched two-unit field solution for locating faults on buried power cables rated 35kV and below. The XHGG502 TDR pre-locator with 400MHz sampling and 68km ranging capacity measures the approximate fault distance, while the XHDD503 acoustic-magnetic pinpointer precisely identifies the fault position to within 0.2m using synchronized acoustic and electromagnetic signals. The complete system covers the full fault location workflow from distance ranging to precise pinpointing, significantly shortening outage time and minimizing excavation area for repair crews.
Applications & Target Audience: Engineered for thermal and hydro power plant electrical maintenance departments, port and logistics park electrical teams, metallurgical and steel plant electrical workshops, large commercial complex and high-rise building electrical maintenance teams, and oil and gas pipeline station electrical units that locate low-resistance, open-circuit, disconnection, high-resistance leakage and flashover faults on buried power cables rated 35kV and below.
System Components
1. XHGG502 — TDR Cable Fault Pre-Locator (with 35kV Pulse Coupler)
Fault Distance Ranging
Industrial-grade 12.1-inch touchscreen all-in-one computer adopting the world's most advanced multi-pulse (eight pulse) method together with high-voltage flashover and low-voltage pulse methods. Any high-resistance fault presents the simplest waveform characteristics similar to a low-voltage pulse short-circuit fault, making waveform interpretation extremely easy. The included pulse coupler withstands DC 35kV, extending reliable testing to medium-voltage cables.
Sampling Frequency: 400MHz
Ranging Range: ≥68km, minimum resolution 0.1m
Pulse Coupler: DC 35kV withstand voltage
Test Methods: LV pulse, HV flashover, multi-pulse method
2. XHDD503 — Acoustic-Magnetic Synchronous Pinpointer
Precise Fault Point Location
High-sensitivity acoustic-magnetic synchronous receiver with 500,000 times amplification, independently designed sound and magnetic channels with separate power supplies for stronger anti-interference capability. Analog meter clearly indicates signal strength and trend, with adjustable zero level suitable for various strong and weak signal sites. The probe features IP65 waterproof protection with multi-layer physical isolation sensors, and the 5-inch touch display supports both pinpointing and cable path identification modes.
Pinpointing Accuracy: Less than 0.2m
Path Identification Accuracy: Less than 0.5m
Magnification: 500,000 times
Standby Time: More than 8 hours
Complete System Specifications
| Parameter |
Specification |
| Model |
XHDD503 + XHGG502 |
| Sampling Frequency (Pre-Locator) |
400MHz |
| Ranging Range |
≥68km, minimum resolution 0.1m |
| Measurement Error |
≤±(0.5%×L+1m) |
| Pulse Coupler Withstand Voltage |
DC 35kV |
| Pre-Location Methods |
Low-voltage pulse, high-voltage flashover, multi-pulse (eight pulse) method |
| Pinpointing Method |
Acoustic-magnetic synchronous dual-channel |
| Pinpointing Accuracy |
Less than 0.2m |
| Path Identification Accuracy |
Less than 0.5m |
| Target Cable Range |
Power cables rated 35kV and below |
| Standards Compliance |
GB/T 18268.1, DL/T 849.1-2019, JJF1042-2020, DL/T 849.2 |
| Certification |
CE / ISO |
Complete Fault Location Workflow
Fault Nature JudgmentUse an insulation resistance meter or multimeter to confirm the fault type, classifying it as low-resistance, open-circuit, high-resistance leakage or flashover fault.
Fault Pre-Location (XHGG502)Connect the pre-locator and apply low-voltage pulse, high-voltage flashover or multi-pulse method to measure the approximate fault distance with 400MHz sampling and up to 68km range.
Cable Route TracingUse the XHDD503 path identification mode to trace the exact cable route and mark the path on the ground surface.
Surge Impulse InjectionApply high-energy surge impulses to the faulty cable with a high-voltage pulse generator to create detectable acoustic and electromagnetic signals at the fault point.
Precise Pinpointing (XHDD503)Walk the cable route with the pinpointer in the rough measurement range; the point where the earphone sound is loudest and the meter swings strongest in synchronization with the sound is the fault point.
Cable Repair and VerificationExcavate precisely at the marked point, repair the cable and verify restoration with a final insulation test.
Field-Ready Design Highlights
IP65 Waterproof Probe: Multi-layer physically isolated signal sensors keep the pinpointer reliable in rain, dust and harsh outdoor conditions.
Independent Acoustic and Magnetic Channels: Separate power supply design greatly improves anti-interference ability, suitable for noisy urban, plant and substation environments.
Deep Fault Sensitivity: 500,000 times amplification with higher sensitivity is especially suitable for locating deeper fault points.
Long Endurance: Both units are powered by large-capacity lithium batteries with more than 8 hours standby, supporting all-day field operations.
Ultra-High Brightness Display: The pre-locator LCD remains clearly readable even in direct sunlight, and the 5-inch touch display provides intuitive operation.
FAQ
Q1: What equipment is included in this portable cable fault locator?
The system includes the XHGG502 TDR cable fault pre-locator with a DC 35kV pulse coupler and the XHDD503 acoustic-magnetic synchronous pinpointer, covering the complete workflow from fault distance ranging to precise point location.
Q2: What types of cable faults can this system detect?
It detects low-resistance, short-circuit, open-circuit and disconnection faults, as well as high-resistance leakage and high-resistance flashover faults in power cables, high-frequency coaxial cables, street light cables and buried wires rated 35kV and below.
Q3: What testing methods does the XHGG502 pre-locator support?
It supports the low-voltage pulse method, high-voltage flashover method (direct and impulse) and the advanced multi-pulse (eight pulse) method, with 400MHz sampling frequency and up to 68km ranging range.
Q4: How accurate is the XHDD503 pinpointer?
It provides acoustic-magnetic positioning accuracy of less than 0.2m and path identification accuracy of less than 0.5m, with 500,000 times amplification and IP65 waterproof probe for reliable field use.
Q5: Which standards does the system comply with?
The pre-locator complies with GB/T 18268.1, DL/T 849.1-2019 and JJF1042-2020, the pinpointer complies with DL/T 849.2, and the complete system is CE and ISO certified.
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