ARC Cable Fault Pre-Locator XP Industrial Platform | 12.1-inch 400MHz 68km | XHGG502

The XHGG502 ARC Cable Fault Pre-Locator is built on a 12.1-inch industrial-grade touch all-in-one computer — a complete computing platform, not a dedicated LCD panel driven by a microcontroller. This architectural choice unlocks capabilities impossible on embedded systems: multi-window waveform comparison, file management with folder structures, USB mass storage support, external keyboard/mouse connectivity, and most critically, the ability to install third-party software for waveform analysis and report customization. The XP desktop is always available — exit the cable test application and you are on a full Windows computer. All three test modes are integrated: low-voltage pulse (400V), high-voltage flashover, and the exclusive 8-pulse ARC multi-pulse method with DC 35kV coupler. Compliant with GB/T 18268.1, DL/T 849.1-2019, and JJF1042-2020.

Embedded instruments present a single application with no way to access the underlying file system. When you save 50 waveforms across a day of field testing, they go into a database you cannot query — and getting them onto a PC for report generation requires proprietary software that may not be installed on your office computer.

The XHGG502 eliminates this dependency. Waveforms are stored as standard files in the Windows file system — organize them into folders by substation, by feeder, by date. Insert a USB flash drive and copy files directly. Open them on any Windows PC with the manufacturer's viewer or third-party analysis software. The XP operating system also means the instrument can host custom spreadsheet templates, cable database files, and PDF viewers for consulting wiring diagrams on site — all without carrying a separate laptop.

For utilities with IT security policies, the XP platform supports standard Windows networking — connect to a LAN, map a network drive, and back up test results to a server at the end of each shift. No proprietary cloud, no vendor lock-in.

Traditional single-pulse TDR works for low-resistance faults: send a pulse, measure the reflection. For high-resistance faults — leakage and flashover — the cable must be energized with high voltage to create an arc at the fault point. The arc behaves like a temporary short circuit, reflecting the test pulse, but the arc exists for milliseconds. The challenge: send the test pulse during the narrow window when the arc is stable but energy from the high-voltage discharge has not yet contaminated the measurement.

The XHGG502's multiple-pulse method solves this by sending 8 successive test pulses during a single high-voltage flashover. The first 8 pulses capture the short-circuit reflection during the arc; 8 more pulses capture the open-circuit reference after the arc extinguishes. This produces 8 groups of paired waveforms — and at least several groups will land in the arc's most stable window, free from high-voltage oscillation interference. The operator selects the cleanest pair for analysis, confident that the fault signature is unambiguous. Compare this to the secondary pulse method (2 groups), where both pairs can fall in the interference zone on difficult faults — leaving no usable data from an entire discharge cycle.

• 12.1-inch Industrial Touch LCD with Stylus: Full-color sunlight-readable display. Stylus for precise cursor positioning on waveform inflection points. Physical amplitude and displacement knobs for rapid waveform adjustment without touching the screen.
• 400V Low-Voltage Pulse, 3 Selectable Widths: 0.25μs for near-end fault resolution; 2μs for standard range; 4μs for maximum penetration on long cables. Higher amplitude than typical 100-300V instruments for greater signal-to-noise ratio on aged and high-loss cables.
• ≤10m Test Blind Spot: One of the lowest in its class. Reliable fault detection starting from 10 meters from the output terminals — critical for faults in substation cable risers and termination cabinets.
• Three Test Length Presets: <1km, <3km, and >3km. Automatic range selection optimizes sampling depth and pulse width for the cable under test. No manual calculation of propagation velocity-to-range ratios.
• Four Cable Types Pre-Programmed: XLPE, PVC, rubber sheathed, and oil-impregnated paper with pre-loaded propagation velocities. Custom velocity entry for non-standard cable types.
• Massive Waveform Storage with Filing System: Named folders by project, feeder, or date. Historical waveform comparison — overlay today's trace on last year's to identify progressive cable degradation before it faults.
• 10400mAH Lithium Battery: 1-hour charge yields 2 hours of standby; 4-hour full charge from empty. Tests open-circuit and low-resistance faults on battery — no generator required.
• Self-Check Function: Built-in self-test transmits a multi-pulse signal for diagnostic verification before field deployment. Confirms instrument, coupler, and cabling integrity in under 30 seconds.
• One-Button System Recovery: Desktop shortcut restores the XP operating system to factory state in minutes — no IT support required if the system becomes corrupted. Full automatic recovery process.

Parameter	Specification
Display	12.1-inch industrial touch LCD, sunlight-readable; stylus included
Platform	industrial computer; USB ×2; keyboard/mouse support
Sampling Frequency	400MHz
Reading Resolution	0.1m
Test Accuracy	<0.5m
Test Range	≥68km; presets: <1km / <3km / >3km
Test Blind Spot	≤10m
Measurement Error	≤±(0.5%×L+1m), L = cable length
Test Methods	LV pulse / HV flashover / 8-pulse ARC multi-pulse
Pulse Amplitude	400V
Pulse Width	0.25μs / 2μs / 4μs
Coupler Withstand Voltage	DC 35kV
Delay Setting	1–10s (multiple pulse method)
Waveform Storage	Massive storage; named filing; historical comparison
Battery	10400mAH lithium; 1hr charge = 2hr standby; 4hr full charge
Power Input (Charging)	AC 110V~240V, 50Hz/60Hz
Cable Types Supported	XLPE, PVC, rubber sheathed, oil-impregnated paper; customizable velocity
Dimensions (Host)	430 × 380 × 220mm; 10kg
Dimensions (Coupler)	430 × 380 × 220mm; 10kg
Operating Conditions	-20℃~+65℃; ≤90% RH; 750±30mmHg
Compliance	GB/T 18268.1; DL/T 849.1-2019; JJF1042-2020; CE; ISO
Warranty	1 Year free; lifetime technical support

packing list

Instrument composition list and diagram
Name	Qty.	Photo	Name	Qty.	Photo
Cable fault tester	1		Coupler	1
Stylus	1		Double Q line	1
Single Q line	1		Power cord	1
Sampler	1		Coupler high-voltage line A	1
Ground wire	1		Coupler high-voltage line B	1