Accurate Portable Cable Fault Location System

The XZH TEST Accurate Portable Cable Fault Location System is a fully integrated diagnostic platform engineered for medium and low voltage underground power cable networks up to 35 kV. Combining a 2048J multi-voltage surge generator, 400 MHz digital TDR pre-locator, acoustic-magnetic high-precision pinpointer, and multi-frequency cable path comprehensive tester into one coordinated field solution, this system covers the entire fault-location workflow — from fault conditioning and pre-location through centimeter-level pinpointing and cable route identification. Designed for utility field crews, electrical contractors, and industrial maintenance teams, it delivers professional-grade accuracy in a rugged, transportable package rated for harsh field environments from -25°C to +65°C.

1. XHHV535-4TS — 2048J High Voltage Surge Generator

Impulse Energy Source & Fault Conditioning

The powerhouse of the system. Delivers up to 2048 Joules of surge energy with three switchable voltage levels (8 kV / 16 kV / 32 kV) for precise energy control across different cable voltage ratings. Provides the high-energy impulses required for arc reflection fault pre-location and acoustic-magnetic pinpointing. Features continuous 60 mA burn current for fault conditioning, zero-start protection interlock, automatic internal capacitance discharge, and IP54-rated enclosure.

• Output Voltage: 8 kV / 16 kV / 32 kV (three-level switchable)
• Discharge Energy: 2,048 Joules (maximum)
• Burn Current: 60 mA @ 32 kV for fault conditioning
• Built-in Capacitor: 64 μF / 16 μF / 4 μF
• Safety: Zero-start interlock, automatic discharge, over-voltage/over-current/overheating protection
• Protection Rating: IP54

2. XHGG502A — Digital TDR Cable Fault Pre-Locator

High-Resolution Fault Ranging

Advanced Time Domain Reflectometer for rapid initial fault distance measurement. Supports four test methods — low-voltage pulse, impulse current, impulse voltage, and ARC multiple pulse — to handle all cable insulation fault types. With a 400 MHz maximum sampling rate, 300 V pulse amplitude, and ten selectable measurement ranges from 100 m to 100 km, it delivers 0.07 m minimum resolution with measurement error ≤±(0.5%×L+1m). Features automatic impedance matching and 0–100% adjustable signal gain.

• Test Methods: LV pulse, Impulse current, Impulse voltage, ARC multiple pulse
• Sampling Rate: 1 MHz – 400 MHz
• Measurement Scope: ≥120 km
• Minimum Resolution: 0.07 m
• Pulse Amplitude: 300 V
• Output Impedance: Automatic match

3. XHDD503C — Acoustic-Magnetic High-Precision Pinpointer

Centimeter-Level Fault Pinpointing

Professional-grade acoustic-magnetic synchronous receiver for precise fault localization. Operates in four modes (Standard, Enhanced, Noise Reduction, Custom) with intelligent time-difference, electromagnetic inspection, and acoustic measurement methods. The 5-inch TFT ultra-bright 800×480 true-color display provides intuitive graphical guidance, while the 120 dB fully automatic gain and 16-gear dynamic range (0–112 dB) ensure reliable detection in the noisiest field conditions. IP65 waterproof rating for all-weather operation.

• Fixed-Point Accuracy: 0.1 m (fixed point & path)
• Gain: 120 dB, fully automatic + manual adjustable
• Frequency Range: 100 – 1600 Hz
• Display: 5-inch TFT ultra-bright 800×480 true color
• Battery: 4 × 18650 lithium, 8+ hour runtime
• Waterproof: IP65

4. XHGX507C — Cable Pipeline Comprehensive Tester

Route Tracing & Identification

Multi-frequency transmitter-receiver system for cable path tracing, depth measurement, cable identification, and step-voltage fault detection. The transmitter outputs up to 15 W across 11 active frequencies (640 Hz to 197 kHz) with 9 adjustable power levels and 150 Vpp maximum output. The receiver features a 4.3-inch sunlight-readable LCD color display showing depth, current, frequency, mode, gain, and signal strength. Supports direct connection, coupling, and induction output methods with Φ150 mm coupling clamp. Detection depth reaches 0–20 m.

• Active Frequencies: 11 frequencies from 640 Hz to 197 kHz
• Output Power: 15 W max, 9 levels adjustable
• Detection Depth: 0 – 20 m
• Display: 4.3-inch LCD color, sunlight-visible
• Working Modes: Tracing, identification, step voltage
• Passive Detection: 50/60/250 Hz power frequency + RF band

1. Cable Insulation Test & Fault Conditioning (XHHV535-4TS)Perform initial insulation resistance measurement to confirm fault presence and characterize fault type. Apply DC or high-voltage surge to condition the fault point — making it flash over and discharge to create a detectable transient signal.
2. Fault Pre-Location (XHGG502A)Connect the TDR pre-locator and use traveling wave reflection principles to make a rough measurement of all types of cable main insulation faults. Select the optimal test method (LV pulse, impulse current, impulse voltage, or ARC multiple pulse) based on fault characteristics for rapid distance calculation.
3. Route Tracing & Identification (XHGX507C)Deploy the comprehensive tester to trace the exact cable path, measure burial depth, and positively identify the target cable among multiple circuits. Mark the route on the ground surface to prepare for precise localization.
4. Surge Impulse Generation (XHHV535-4TS)Apply high-energy surges to the faulty cable at the selected voltage level to create detectable acoustic and electromagnetic signals at the fault point for the pinpointer.
5. Precise Pinpointing (XHDD503C)Walk the cable route with the acoustic-magnetic pinpointer using intelligent time-difference and synchronous trigger methods. Identify the exact fault location to within 0.1 m — minimizing excavation area and repair time.
6. Cable Repair & VerificationExcavate precisely at the marked point, repair the cable, and verify restoration with a final insulation test to confirm operational integrity.

• Urban Distribution Networks: Fault location on buried medium and low-voltage distribution cables in city environments — where 0.1 m pinpointing accuracy minimizes road excavation, traffic disruption, and restoration costs.
• Industrial Facilities: Diagnostics on plant power distribution cables, including those running under concrete floors, paved yards, and building foundations where access is constrained.
• Renewable Energy Sites: Cable fault detection in wind farms, solar PV plants, and energy storage facilities with extensive buried collector and feeder cable networks.
• Transportation Infrastructure: Underground cable diagnostics for railways, airports, ports, and tunnel electrical systems where rapid fault recovery is critical to operational continuity.
• Electrical Utilities & Service Contractors: Routine preventive maintenance, emergency fault response, and post-installation commissioning testing for LV/MV power cable networks.