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PDL-OL Overhead Line Partial Discharge Double-Ended Location System

PDL-OL Intelligent Double-Ended Partial Discharge Location System for Overhead Power Lines, Adopting Traveling Wave Time Difference Principle with GPS/Beidou High-Precision Synchronization, for Live Detection and Defect Positioning of 3kV~35kV Overhead Distribution Lines.

Description
Specifications
Applications
Advantages
FAQ
Recommended Products

Description

PDL-OL is a professional overhead line partial discharge detection and positioning system designed for power distribution operation & maintenance departments, industrial park power management and new energy distribution stations. It is dedicated to live detection and precise location of insulation defects on 3kV ~ 35kV overhead distribution lines, strictly complying with IEC 60270, Q/GDW 11660-2022 and relevant industry standards.

The system consists of two high-frequency acquisition terminals installed at both ends of the target line segment and a set of background analysis management software. Based on the traveling wave time of arrival (TOA) principle, when partial discharge occurs on the line or line accessories (insulators, connectors, fittings), the discharge pulse propagates along the conductor as high-frequency current traveling waves to both ends. The two terminals perform nanosecond-level synchronous sampling through GPS/Beidou dual-mode timing, and the background software calculates the exact position of the discharge point according to the time difference of arrival combined with the traveling wave velocity of the overhead line.

Specifications

Parameter	Specification
Positioning Principle	Double-terminal traveling wave time of arrival (TOA) method
System Composition	2 × acquisition terminals + background analysis management software
Timing Mode	GPS/Beidou dual-mode, synchronization error ≤ 0.1μs
Sampling Rate	100MS/s per channel
Detection Sensitivity	≤ 50pC
Positioning Accuracy	≤ 10m (for line length ≤ 10km)
Frequency Band	5kHz ~ 20MHz
Applicable Line Voltage	3kV ~ 35kV overhead lines
Sensor Type	Open-type high-frequency current transformer, non-intrusive installation
Terminal Power Supply	Induction energy harvesting + solar panel + built-in lithium battery backup
Battery Backup Duration	≥ 30 days (without induction and solar power)
Communication Mode	4G wireless data transmission, offline data storage and retransmission
Terminal Protection Grade	IP67
Background Software	B/S architecture, GIS visualization, alarm management, trend analysis, report generation
Operating Temperature	-40℃ ~ +70℃
Ambient Humidity	5% ~ 100% RH
Installation Mode	Pole-mounted / tower-mounted, no power outage required

Applications

Core Detection Objects

3kV ~ 35kV overhead distribution lines
Overhead line insulators (porcelain, glass, composite insulators)
Line connectors, strain clamps, suspension clamps and other hardware
Overhead conductor strand breakage, wear and corrosion defects
Tree barrier, foreign object suspension and other hidden discharge hazards

Typical Application Scenarios

Power distribution operation & maintenance: overhead line routine live inspection, insulation state evaluation and hidden danger troubleshooting
Industrial and mining enterprises: internal overhead power line periodic inspection and preventive maintenance
New energy power stations: wind farm, photovoltaic station collection overhead line acceptance and daily patrol
Railway and municipal: overhead lines along railways, street lamp lines insulation detection
Third-party testing institutions: overhead line insulation state testing and technical service

Advantages

High-Precision Double-Ended Positioning

Nanosecond-level synchronous timing + traveling wave TOA algorithm → positioning accuracy up to 10m level, accurately locates hidden discharge points on long lines

Live Non-Intrusive Installation

Open-type sensor, no power outage required for installation → does not affect normal power supply, safe and efficient on-site operation

All-Weather Outdoor Adaptability

IP67 protection, dual power supply, wide temperature design → long-term stable operation in various harsh outdoor environments

Intelligent Defect Grading Warning

Automatic defect type identification + severity grading → changes from post-fault repair to pre-fault warning, reduces line outage rate

Visual Background Management

GIS map positioning + multi-channel alarm + trend analysis → intuitive and efficient operation, supports large-scale distribution network networking management

FAQ

Q: What is the difference between double-ended PD location and single-ended detection?

A: Single-ended PD detection mainly judges discharge intensity by signal amplitude, cannot achieve accurate distance measurement, and is susceptible to signal attenuation and environmental interference. The double-ended system uses the time difference of traveling wave arriving at both ends to calculate the position, which is not affected by signal amplitude attenuation, with higher positioning accuracy and stronger anti-interference ability, and can directly give the specific distance of the discharge point, which is convenient for on-site troubleshooting.

Q: Does installation require line power outage?

A: No. The system adopts an open-type non-intrusive current sensor, which can be directly clamped on the overhead conductor with an insulating operating rod, and the terminal is installed on the pole / tower. The whole installation process does not need to cut off the line power supply, and does not affect the normal operation of the distribution network.

Q: How is the terminal powered when the line is lightly loaded or at night?

A: The terminal adopts a three-in-one power supply scheme: line induction energy harvesting as the main power supply during normal operation, solar panel as auxiliary power supply during daytime, and built-in large-capacity lithium battery as backup. When the line load is low and there is no sunlight, the lithium battery can support continuous operation for more than 30 days, ensuring stable operation under various working conditions.