ARC Cable Fault Pre-Locator for 35kV Cables | 12.1-inch 400MHz 68km | XHGG501A2

The XHGG501A2 ARC Cable Fault Pre-Locator is purpose-configured for the medium-voltage power cable networks that form the backbone of utility distribution systems worldwide. With a 12.1-inch industrial touch display, 400MHz real-time sampling engine, and fully automatic continuous waveform acquisition, it accurately locates low-resistance, short-circuit, open-circuit, leakage high-resistance, and flashover high-resistance faults on power cables rated 35kV and below. Three test methods — low-voltage pulse (400V, 0.25/2/4μs triple width), high-voltage flashover, and multi-pulse — ensure coverage of all fault types encountered in medium-voltage cable maintenance. The instrument also calibrates cable length and measures propagation velocity for accurate distance calculation. CE ISO certified.

High-voltage transmission cables (66kV+) are inspected by dedicated transmission-line maintenance teams with specialized equipment budgets. Low-voltage cables (<1kV) are typically short enough for section-by-section isolation testing. The medium-voltage range — 6kV to 35kV — is where the majority of cable fault investigations occur: urban distribution feeders, industrial plant incoming cables, wind farm collection circuits, and substation interconnectors. These cables run kilometers between accessible points, cross under roads and buildings, and carry loads that cannot be shed for extended troubleshooting. The XHGG501A2 is built specifically for this operating environment.

The instrument's human interface combines a capacitive touch screen with dedicated hardware knobs — a deliberate choice for field reliability. When wearing insulated gloves in a 35kV substation, the physical amplitude and displacement knobs allow waveform adjustment without removing gloves or risking touch-screen contamination in wet conditions. The 4-grid LED battery indicator provides instant power status at a glance — no menu navigation required. USB ×2 ports support external keyboard/mouse for office-based analysis and USB flash drives for waveform export. A dedicated self-check button verifies system integrity with a single press before field deployment.

The XHGG501A2's 400MHz sampling engine acquires 400 million data points per second — translating to 0.1m reading resolution and <0.5m test accuracy. Three selectable pulse widths optimize the signal for different fault scenarios:

• 0.25μs Narrow Pulse: Maximum resolution for near-end faults and short cable segments. Resolves reflections from faults within the first hundred meters where standard 2μs pulses would mask the fault behind the transmit pulse ringing.
• 2μs Standard Pulse: Balanced energy for cable lengths up to approximately 30km. Sufficient power to reach the far end of most distribution cables while maintaining clean rising-edge characteristics for precise cursor placement.
• 4μs Wide Pulse: Maximum energy for cables exceeding 30km and high-loss aged cables with significant attenuation. The additional pulse energy ensures a usable reflection signal reaches the instrument despite distributed losses along the cable length.

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