Table of Contents

Introduction to Intelligent Insulator Tester

The insulation resistance of insulators on high-voltage transmission lines directly affects the safe and stable operation of power lines. Once insulators become zero-value or contaminated, they must be cleaned or replaced; otherwise, flashover and tripping failures may occur. Currently, numerous insulator testing methods and tools are available, yet most only deliver qualitative testing. They cannot accurately reflect the insulation condition of each single insulator and fail to support predictive maintenance.

The Live-line Insulator Resistance Tester (hereinafter referred to as the tester) is a high-performance instrument for quantitative detection and analysis of the existing degradation status of insulator strings. Featuring simple and rapid operation, it can accurately measure the resistance value of each insulator under live-line conditions. It effectively identifies insulators with leakage current that have not yet broken down and are at critical failure status. Test data can be recorded, stored and displayed in real time, and the tester triggers automatic alarms for low-value insulators.

Functions of HF-LT-307 Intelligent Insulator Tester

Live-line Testing

Adopting special technology, the intelligent insulator tester realizes resistance measurement for insulators under live conditions. It is no longer limited to offline testing and supports a wider range of applications.

Alarm Reminder

In accordance with power industry safety testing standards, insulators with resistance below 500 MΩ are defined as low-value insulators, which will trigger automatic alarms during testing. Compared with the first-generation model with audio alarm only, this unit adds visual light alarm to avoid insufficient alarm visibility during field and long-distance testing.

Data Storage & Query

The tester can save test results for subsequent historical data review. During storage, users enter tower number, circuit number, phase and string number following on-screen prompts before starting tests. The instrument automatically counts the number of tested insulators per string based on measured data.

To view records, press “Query” and “Browse Records”. Historical results will be displayed sequentially, and zero-value insulators are highlighted in red to remind operators.

Technical Parameters of ME-16B Intelligent Insulator Tester

Item	Specification
Product Name	Intelligent Insulator Tester
Model	HF-LT-307
Application Scope	Live-line (or offline) testing for disc & suspension insulators on 35–500kV high-voltage transmission lines
Measuring Range	1–5000 MΩ
Measurement Error	±5%
Display	2.4-inch touch screen
Power Supply	7.4V rechargeable lithium battery
Continuous Working Time	≥7 hours
Standby Time	30 hours
Operating Conditions	Ambient temperature: -25℃ ~ +40℃ Relative humidity: ≤75% Atmospheric pressure: 86kPa ~ 106kPa
Storage Conditions	Ambient temperature: -40℃ ~ +55℃ Relative humidity: ≤90% Atmospheric pressure: 86kPa ~ 106kPa
Total Weight	260 g
Overall Dimension	L×W×H (165×120×30) mm
Executed Standard	Q/HDSLE001—2003
Insulating Rod	Standard configuration: 6 meters (customizable upon request)

FAQ for Intelligent Insulator Tester

Q1: What is the applicable voltage level of this tester?

A1: It supports live-line or offline detection of disc suspension insulators for 35kV to 500kV high voltage transmission lines.

Q2: Can the instrument carry out live testing?

A2: Yes. It can test insulators under live working conditions, not limited to power-off inspection.

Q3: What is the measuring resistance range?

A3: Measuring range: 1 MΩ ~ 5000 MΩ with measurement error within ±5%.

Q4: How does it judge low-value insulators?

A4: Insulators below 500 MΩ are defined as low-value insulators. The tester triggers audible and visual dual alarms automatically.

Q5: Does it support data storage and historical record query?

A5: Yes. Test data can be saved with tower number, phase and string information. Zero-value insulators will be highlighted when browsing records.

Q6: What about battery working performance?

A6: Powered by 7.4V rechargeable lithium battery. Continuous working time ≥7 hours; standby time reaches 30 hours.

Q7: Is the insulating rod included in standard delivery?

A7: A 6-meter insulating rod is supplied as standard; different lengths can be customized according to requirements.

Q8: What are the operating temperature limits?

A8: Operating ambient temperature: -25℃ ~ +40℃; storage temperature: -40℃ ~ +55℃.

Q9: Is the equipment lightweight for field overhead line inspection?

A9: The main unit weighs only 260g with compact size 165×120×30 mm, easy to carry for field operations.

Q10: What screen is equipped on the tester?

A10: It adopts a 2.4-inch touch screen for intuitive data display and simple operation.

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