Underground Cable Fault Pinpointer XHDD503
The XHDD503 Cable Fault Pinpointer uses vibration pickup and electromagnetic induction principles to precisely determine underground cable fault locations. With the aid of a high-voltage pulse generator, flashover discharge at the fault point generates vibration waves, sound waves, and electromagnetic waves. These physical phenomena are picked up by a specialized probe, amplified and processed by the instrument, and displayed for the operator's auditory and visual judgment to complete precise fault location directly above the cable.
Suitable for low-resistance, short-circuit, open-circuit, and disconnection faults of power cables, high-frequency coaxial cables, street light cables, and buried wires made of various materials with different cross-sections and media. Complies with DL/T 849.2-2019 standards for cable fault detectors.
Key Performance Advantages
Magnification: 500,000x | Detection Depth: >10m | Battery Life: 20+ hours | Quiescent Current: <10mA
1.Synchronously receives vibration waves, sound waves and electromagnetic waves generated during fault point discharge.
2.Separately designed and independently powered acoustic and magnetic channels for superior anti-interference capability.
3.500,000x super magnification with >10m detection depth for deep buried cable faults.
4.Analog microammeter design provides signal strength and trend at a glance.
5.Adjustable zero level adapts to various strong and weak signal field environments.
6.Ultra-low power design with <10mA quiescent current ensures 20+ hours of continuous field operation.
7.Multi-layer physical isolation sensor with IP65 waterproof protection.
| Parameter |
Specification |
| Magnification |
500,000 times |
| Positioning Accuracy |
<0.1m (acoustic-magnetic) |
| Output Impedance |
350Ω |
| Detection Depth |
>10 meters |
| Quiescent Current |
<10mA |
| Continuous Operation |
>20 hours |
| Working Power Supply |
4 × 3.7V 3200mAh lithium batteries |
| Ambient Temperature |
-25 ~ 65℃; Humidity: ≤90% |
| Main Unit Dimensions |
190 (L) × 75 (W) × 135 (H) mm |
| Main Unit Weight |
0.81 kg |
| Probe Dimensions |
85 (D) × 100 (H) mm |
| Probe Weight |
1.4 kg |
| Overall Dimensions (Packed) |
428L × 350W × 230H mm |
| Overall Weight |
7 kg |
The acoustic-magnetic synchronization method is a highly accurate and unique fault location technique. Its principle is based on traditional acoustic location, enhanced with electromagnetic signal detection and application.
When a high-voltage pulse acts on the faulty cable, flashover discharge occurs at the fault point, generating vibration waves, sound waves, electromagnetic waves, and other physical phenomena. The instrument simultaneously detects these signals through its dual-channel (acoustic + magnetic) design. By comparing the time difference between the electromagnetic signal (near-instantaneous propagation) and the acoustic signal, the precise distance to the fault point is calculated. The operator moves the probe to find the point with the smallest time difference, which indicates the exact fault location directly below.
The independently powered acoustic and magnetic channels greatly enhance anti-interference capability, making this instrument effective even in electrically noisy field environments where traditional single-channel acoustic detectors struggle.
| Component |
Quantity |
| Cable Fault Pinpointer (Main Unit) |
1 |
| Probe (including connecting rod and sensor) |
1 |
| 7-Core Signal Cable |
1 |
| Headphones |
1 |
| Charger |
1 |
After-Sales Service: 12-month free warranty for product quality issues, lifetime maintenance and technical support.
On-site photos
Frequently Asked Questions
Q: What does 500,000x super magnification mean in practice?
500,000x signal amplification allows the pinpointer to detect extremely faint acoustic and magnetic signals from deep or high-resistance faults that produce weak discharge pulses. This is especially valuable for cables buried deeper than 5m or in attenuating soil conditions where standard-gain pinpointers fail to register any signal at the surface.
Q: How does the 20-hour continuous operation improve field productivity?
Extended 20-hour battery life covers multi-day field operations on a single charge, eliminating the need to carry spare batteries or return to base for recharging. This is critical for remote sites, offshore wind farms, and cross-country cable routes where charging infrastructure is unavailable. The unit can run two full shifts plus overnight monitoring without interruption.
Q: What types of cable faults is this pinpointer designed for?
Designed for flashover and high-resistance leakage faults in underground power cables rated 35kV and below. The high-gain acoustic-magnetic detection system works with any HV surge generator producing periodic discharge pulses. It is compatible with XLPE, oil-impregnated paper, and rubber/plastic dielectric cables in both direct-buried and ducted installations.
Q: How do you confirm you are directly above the fault point?
The acoustic-magnetic synchronization display shows the time difference between the electromagnetic pulse (instantaneous) and the acoustic wave (delayed by soil travel time). When directly above the fault, this time difference reaches its minimum. Moving away increases the time delta. Combined with peak acoustic volume at the fault epicenter, you get dual confirmation before excavation.
Q: Does the pinpointer work with any HV surge generator?
Yes. The pinpointer is source-agnostic and works with any equipment producing periodic high-voltage discharge pulses: integrated systems (XHHV535 series), traditional test transformer + capacitor banks, and burn-through bridges in pulse mode. For best results, use periodic/cycle discharge mode at 5-10 second intervals for consistent acoustic rhythm recognition.
Q: What warranty and support is included?
12-month standard warranty covering manufacturing defects, with lifetime technical support. CE and ISO certified. Package includes pinpointer unit, headphones, ground sensor, carrying case, charger, and user manual. On-site training and extended warranty options available upon request.
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