Product Introduction

The HCDL-III Overhead Line Fault Locator is designed for pinpointing faults on 6–35 kV overhead lines. It is capable of addressing a wide variety of fault types, including low-resistance faults, high-resistance faults, arcing ground faults, and phase-to-phase short-circuit faults. It provides a comprehensive solution for overhead line fault localization, integrating four key functions: fault diagnosis, AC localization, DC localization, and both DC and AC withstand voltage testing. Featuring an innovative AC localization mode, the device allows for the detection of characteristic signals directly beneath the line in the case of low-resistance faults; this eliminates the need to climb poles or attach sensors to the line, offering the advantages of simple operation and user-friendly convenience. For high-resistance faults occurring on lines equipped with intelligent switches (where grounding PTs are present), the system employs a combination of AC localization and a voltage booster, thereby eliminating the need to disconnect the PTs. The transmitter features a built-in high-capacity lithium battery, ensuring ease of use and portability.

The HCDL-III Overhead Line Fault Locator system primarily consists of a transmitter, a receiver, an AC voltage booster, a direct-connection sensor, a suspension sensor, an arcing ground adapter, and various accessories.

Product Aliases: Small-Current Grounding System Single-Phase Ground Fault Tester; Overhead Line Ground Fault Locator; Overhead Line Ground Fault Pinpointer; Overhead Line Small-Current Ground Fault Locator.

Technical Parameters

Product Features

◆ HCDL-III Overhead Line Fault Locator – Application: Fault detection and localization on 6–35kV overhead lines.

◆ The HCDL-III Overhead Line Fault Locator integrates five key functions: fault diagnosis, AC localization, DC localization, AC withstand voltage testing, and DC withstand voltage testing.

◆ Fault Diagnosis

→ Guides the selection of the appropriate localization method.

→ Measures line Insulation Resistance and capacitance.

◆ AC Localization – Direct Connection Output (for low-transition-resistance ground faults):

→ Signal Transmission: Active injection of a high-power, specialized low-frequency AC signal.

→ Signal Reception: Segmented search along the line; no need to climb poles to attach sensors.

→ High Efficiency: Eliminates the need to climb poles, significantly boosting testing efficiency and reducing labor intensity.

◆ AC Localization – External Booster Output (for lines with grounded PTs or medium-transition-resistance ground faults):

→ Signal Transmission: Active injection of a high-power, specialized low-frequency AC signal.

→ Signal Reception: Segmented search along the line; requires climbing poles to attach sensors.

→ No need to disconnect the line's grounded PTs.

→ Features innovative comparison of resistive current content and current amplitude ratios, enabling effective localization across a wider range of fault conditions.

◆ DC Localization (for high/low-transition-resistance ground faults and arcing ground faults):

→ Signal Transmission: Active injection of a high-power pulsating DC signal.

→ Signal Reception: Segmented search along the line; requires climbing poles to attach sensors.

→ Versatile localization mode, particularly effective at resolving the challenging problem of locating arcing ground faults.

◆ DC and AC Withstand Voltage Testing

→ Acceptance testing following fault repair.

◆ The transmitter features an automatic discharge function upon shutdown to ensure operational safety.

◆ The transmitter includes built-in overcurrent and over-temperature protection functions.

◆ The transmitter is equipped with a built-in, high-capacity lithium-ion battery pack for easy portability.

◆ The receiver employs fully digital, high-sensitivity signal processing, providing clear and intuitive fault localization criteria.

◆ Features a data memory function that retains data even after power loss, facilitating more convenient and precise fault pinpointing.