Cable Fault Locator TDR Pre-Locator Surge Generator Acoustic Pinpointer 35kV 1225J | XHGG502 XHHV535-2L XHDD503C

The XHGG502, XHHV535-2L and XHDD503C portable cable fault locating system is a complete three-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, the XHHV535-2L surge generator with up to 1225J discharge energy injects high-energy impulses to break down the fault point, and the XHDD503C acoustic-magnetic pinpointer with 0.1m positioning accuracy precisely identifies the fault position. Together they cover the entire workflow from fault ranging to precise pinpointing, shortening outage time and minimizing excavation area for repair crews.

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. XHHV535-2L — 35kV High Voltage Surge Generator

Impulse Energy Injection

Portable high-voltage surge generator integrating a DC high-voltage source, energy storage capacitor and discharge ball gap. It delivers 0-35kV impulse voltage with up to 1225J discharge energy to break down and flash over cable fault points, enabling acoustic and magnetic synchronized fault point determination. The ultra-light design under 25kg completely replaces traditional test transformers and operation boxes weighing hundreds of kilograms.

• Impulse Voltage: 0-35kV (default 0-32kV)
• Discharge Energy: 0-1225J (default 0-1024J)
• Built-in Capacitor: 2μF
• Weight: No more than 25kg

3. XHDD503C — Acoustic-Magnetic Synchronous Pinpointer

Precise Fault Point Location

Upgraded acoustic-magnetic synchronous pinpointer with 0.1m positioning accuracy. The 5-inch touch high-brightness LCD remains clearly visible under sunlight. It automatically calculates the acoustic-magnetic time difference, features background noise reduction (BNR) and mute noise reduction functions, and provides path deviation indication. The probe adopts multi-layer physically isolated sensors with IP65 waterproof rating, and both acoustic and magnetic gains are independently adjustable in 8 levels to adapt to various site conditions.

• Pinpointing Accuracy: Less than 0.1m
• Path Identification Accuracy: Less than 0.5m
• Noise Reduction: BNR background noise reduction + mute mode
• Standby Time: More than 8 hours

1. 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.
2. 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.
3. Cable Route TracingUse the XHDD503C path identification mode with path deviation indication to trace the exact cable route and mark the path on the ground surface.
4. Surge Impulse Injection (XHHV535-2L)Apply high-energy 0-35kV surge impulses with up to 1225J discharge energy to break down the fault point and generate detectable acoustic and electromagnetic signals.
5. Precise Pinpointing (XHDD503C)Walk the cable route with the pinpointer; the BNR noise reduction filters out ambient noise, and the point with the smallest acoustic-magnetic time difference is the exact fault location.
6. Cable Repair and VerificationExcavate precisely at the marked point, repair the cable and verify restoration with a final insulation test.

• 0.1m Ultra-High Pinpointing Accuracy: The upgraded XHDD503C pinpointer delivers centimeter-level positioning with automatic acoustic-magnetic time difference calculation, far exceeding conventional acoustic-only methods.
• BNR Background Noise Reduction: Effectively filters ambient noise in noisy urban, plant and roadside environments, making faint discharge signals at deep fault points clearly audible.
• Simplest High-Resistance Fault Interpretation: The multi-pulse method presents any high-resistance fault as a simple low-voltage pulse short-circuit waveform, dramatically reducing operator skill requirements.
• 35kV Medium-Voltage Coverage: The 35kV pulse coupler and 0-35kV surge generator cover the most common urban distribution network voltage levels.
• Complete Field Portability: All three units feature lightweight portable designs with built-in large-capacity lithium batteries, supporting continuous all-day field operations.