Cable Fault Testing System
The ZWT201 is a comprehensive, multi-component diagnostic system designed to pinpoint underground power and communication cable faults.
Utilizing advanced Time Domain Reflectometry (TDR) and multiple-pulse technologies, the system seamlessly detects open circuits, short circuits, low resistance, and high resistance leakage/flash-over faults with pinpoint accuracy.
Product Overview
The ZWT201 Cable Fault Testing System consists of four core components: the Cable Fault Tester (TDR), Aesthetic & Electromagnetic Synchronous Fault Locator, Cable Path Tester, and an intelligent Surge Voltage Generator.
This complete package allows field engineers to locate cable paths, measure depths, pre-locate fault distances, and execute precise acoustic pinpointing for fast and decisive underground repairs.
Key Functions & Features:
1. Advanced Multiple-Pulse Method: Continuously captures and superimposes 8 true waveforms via Time Domain Reflectometry (TDR), simplifying complex high-resistance fault waveforms into easy-to-read low-voltage short-circuit curves.
2. Extreme Testing Range: Pre-locates cable faults up to 60km away with an exceptional 1m resolution and accuracy.
3. Accurate Cable Path Tracing: The Path Tester supports direct-connection, coupling, and induction methods. Uses Traverse, Classic Compass, and Sweep modes to provide a 360° all-around routing and depth indication (up to 20m depth).
4. Acoustic & Electromagnetic Sync Pinpointing: The pinpointing receiver rejects over 40dB of power frequency noise. It clearly syncs acoustic seismic waves with electromagnetic pulses to find precise fault locations in noisy environments.
5. Intelligent 32kV Surge Generation: The surge generator delivers 0 to -32kV negative DC high voltage (up to 2048J energy). It features programmable pulse periods, automatic voltage stabilization, built-in discharge, and one-button emergency stop.
6. Cable ID & Low-Resistance Locating: The Path Tester can actively identify up to 20 cables (dead or live). Equipped with an A-frame (step-voltage method), it instantly outputs left/right directional arrows to zero in on low-resistance points.
7. User-Friendly Touch UI: All components feature industrial-grade color LCD touch screens (up to 8.0 inches) with intuitive graphical representations and robust built-in lithium batteries for over 4 to 12 hours of field operation.
Technical Details
| Parameter | Specification |
|---|---|
| Model | ZWT201 |
| Applicable Cables | Power cables (≤ 35kV), communication and coaxial cables |
| Fault Types Detected | Open circuit, short circuit, low resistance, high resistance leakage, and flashover |
| Part 1: Cable Fault Tester | |
| Test Methods | Low-voltage pulse, impulse flashover, velocity measurement, multiple pulse (3-pulse / 8-pulse) |
| Sampling Rate | 10 MHz to 200 MHz |
| Pulse Width | 0.05 μs to 8 μs |
| Impulse High Voltage | ≤ 40 kV |
| Max Testing Distance | < 60 km |
| Resolution & Accuracy | 1 m |
| Display | 8.0-inch color touch LCD |
| Power Supply & Operating Time | Built-in rechargeable battery; > 4 h continuous |
| Dimensions & Weight | L 415 mm × W 319 mm × H 168 mm; 2.2 kg (bare unit) / 4.5 kg (with case) |
| Part 2: Acoustic & Electromagnetic Synchronous Fault Locator | Part 2: Acoustic & Electromagnetic Synchronous Fault Locator2 |
|---|---|
| Display Distance | 0.1 m - 500 m |
| Pinpointing Error | 0 (Rough measurement error < 10%) |
| Electromagnetic Gain & Sensitivity | Gain ≥ 110 dB; Receiver sensitivity ≤ 5 μV |
| Audio Channel Gain | ≤ 120 dB |
| Power Frequency Rejection | 40 dB |
| Auxiliary Detection | Cable path and buried depth detection via 15 kHz electromagnetic sensor |
| Power Supply & Operating Time | Built-in rechargeable battery; > 12 h continuous |
| Dimensions & Weight | L 415 mm × W 369 mm × H 168 mm; 6.5 kg |
| Part 3: Cable Path Tester | Part 3: Cable Path Tester 2 |
|---|---|
| Output Modes (Transmitter) | Direct connection, coupling, induction |
| Output Power & Voltage (Transmitter) | Max 15 W (9 adjustable levels); Max 150 Vpp |
| Active Frequencies | 640 Hz to 197 kHz (11 frequencies) |
| Passive Frequencies (Receiver) | Power: 50 Hz, 60 Hz, 250 Hz; Radio: 32.7 kHz, 65.6 kHz, 81.9 kHz, 197 kHz |
| Detection Modes & Methods | Modes: Traverse, compass, sweep; Methods: Peak, narrow peak, trough |
| Detection Range | Direct connection: ≤ 20 km; Coupling: ≤ 10 km; Induction: depth ≤ 2 m |
| Depth Range & Accuracy | Range: 0 - 20 m; Accuracy: ±5% (0 - 3 m), ±10% (3 - 20 m) |
| Cable Identification | Up to 20 cables simultaneously (live or unpowered) |
| Sheath Fault Pinpointing | Step-voltage method with A-frame for low-resistance grounding faults |
| Power Supply & Operating Time | Built-in rechargeable lithium battery; Transmitter > 8 h, Receiver > 12 h |
| Transmitter Dimensions & Weight | 277*227*153 mm; ≤ 3.5 kg |
| Receiver Dimensions & Weight | 155*295*695 mm; ≤ 1.8 kg |
| Part 4: Surge Voltage Generator | Part 4: Surge Voltage Generator2 |
|---|---|
| Output Voltage | 0 - 32 kV negative DC, continuously adjustable |
| Capacitor & Impact Energy | 2 μF (1024 J) / Optional 4 μF (2048 J) |
| Working Modes | Continuous pulse, single pulse, DC output |
| Pulse Period | 0 - 99 s adjustable |
| Output Power & Accuracy | ≤ 1.5 kVA; Voltage display error ≤ ± 2% |
| Safety & Protection | Auto discharge within 3 s (capacitor & tested cable); Emergency stop button |
| Display | 4.3-inch color LCD (real-time voltage, current, and discharge icon) |
| Power Supply | AC 220 V ± 10%, 50 Hz |
| Dimensions & Weight | 490*370*450 mm; ≤ 23 kg (2 μF) / ≤ 28 kg (4 μF) |
Model Selection Guide
| Feature | ZW5320 | ZW8320 |
|---|---|---|
| Max Output Current | 20A | 20A |
| Max Resistance Range | Up to 200Ω | Up to 25kΩ (Includes 10mA, <1mA steps) |
| 3-Phase Auto Test | Supported | Supported |
| Auto Degaussing | Supported | Supported |
| Magnetic Assist | Not available | Supported |
| Best Application | Standard distribution & medium power transformers. | Large power transformers requiring rapid LV winding tests. |
Recent Work
Parts List
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
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Frequently Asked Questions
Contact our engineers for technical support and application guidance.
Yes. High-resistance and flash-over faults are typically the hardest to locate. By using the system’s Multiple-Pulse TDR method in conjunction with the 32kV Surge Generator, complex high-resistance faults are converted into simple, readable short-circuit waveforms.
Operator safety is prioritized. The Surge Generator is fully integrated into a rugged chassis with no exposed high-voltage components. It features software-controlled automatic voltage boosting, a one-button emergency stop, and an automatic capacitor discharge function that safely removes residual power within 3 seconds of stopping.
Yes. Using the flexible coupling clamp method, the Path Tester Receiver can actively identify and trace up to 20 grouped cables, regardless of whether they are in a dead (power failure) or live state.
Underneath the ground, cable sparks (from the surge generator) create both an electromagnetic pulse and an acoustic ‘thump’. The ZWT201 Locator receives both signals. Because electromagnetic waves travel faster than sound, the device measures the time delay between the two to give you a precise digital distance to the exact fault spot above ground.
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