Product Introduction

LDDL-III Overhead Line Fault Locating Instrument, suitable for locating faults in 6-35kV overhead lines, capable of resolving various fault types including low-resistance faults, high-resistance faults, arc-ground faults, and phase-to-phase short circuits. Offers a comprehensive solution for overhead line fault location, integrating fault diagnosis, AC location, DC location, DC withstand voltage, and AC withstand voltage functions. The innovative AC location mode detects characteristic signals directly below the line for low-resistance faults, eliminating the need to climb poles and install sensors, featuring easy operation and convenient use. For high-resistance faults on lines equipped with smart switches (with ground PT), employs AC location with a step-up transformer, without the need to disconnect the PT. The transmitter is built with a high-capacity lithium battery, facilitating ease of use and portability.

The LDDL-III overhead transmission line fault locating device mainly consists of a transmitter, a receiver, an AC step-up transformer, directly connected sensors, suspended sensors, an arc ground adapter, and accessories.

Product Alias: Single-phase Ground Fault Test Instrument for Low Current Grounding System, Overhead Line Ground Fault Locating Instrument, Overhead Circuit Ground Fault Locating Instrument, Overhead Line Low Current Ground Fault Locating Instrument

Product Features

◆ LDDL-III Overhead Line Fault Locating Device Usage: Fault location for overhead lines rated 6-35kV

The LDDL-III overhead line fault location device integrates five functions: fault diagnosis, AC positioning, DC positioning, AC withstand voltage, and DC withstand voltage.

◆ Fault Diagnosis

→ Guide appropriate positioning methods.

Line insulation resistance and capacitance measurement.

Direct Output (Low Transition Resistance to Ground) - Communication Orientation

Transmitted Signal: Active injection of high-power special low-frequency AC signals.

Signal Reception: Locate segments along the line without climbing poles to attach sensors.

Efficient Work: No need to climb poles, significantly improves testing efficiency, and reduces workload intensity.

Communication Position - External Step-up Transformer Output (Line has a grounded PT, intermediate transition resistance grounded):

→ Transmission Signal: Active injection of high-power special low-frequency AC signal.

Signal Reception: Segment-wise search along the line, requires climbing poles to attach sensors.

No need to disconnect the line grounding PT.

Innovative comparison of resistive current content and amplitude, solving a wider range of fault issues.

Direct Current Positioning (High/Low Transition Resistance Grounding and Arc Grounding):

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

Signal Reception: Segment-wise search along the line, requires climbing poles to connect sensors.

All-in-one positioning mode, especially solving the arc grounding positioning challenge.

Direct current withstand voltage and alternating current withstand voltage

Post-repair acceptance test.

The transmitter features an auto-discharge stop function, ensuring safe operation.

The transmitter features overcurrent and over-temperature protection functions.

The transmitter is equipped with an integrated high-capacity lithium-ion battery pack for easy portability.

◆ The receiver samples signals with full digital high-sensitivity signal processing, with clear and intuitive criteria.

◆ Features data memory function, retains data during power outages, and offers convenient pinpointing.