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HF-LT-304 Live Insulator Resistance Tester
This Live Insulator Resistance Tester realizes on-site resistance measurement of line insulators without power cut. It identifies low-resistance and faulty insulators efficiently, eliminating hidden risks such as flashover and ensuring stable power grid operation.
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Insulators are critical components in power grids, and their quality directly affects grid safe operation. After being energized, field insulators endure long-term mechanical and electrical loads, together with harsh operating conditions such as lightning strikes, sunlight and rain. Their electrical and mechanical performance may degrade. When deterioration reaches a certain level, zero-value insulators appear. Their insulation capability fails to meet operational requirements, posing a direct threat to power system safety.
Measuring the insulation resistance of insulator strings effectively evaluates the insulation condition of each insulator, detects hidden internal faults, and improves the reliability of power grid operation.
Instrument Introduction
Our self-developed tester can accurately and quantitatively measure the resistance of every single insulator without power outage. It can distinguish insulators with leakage current yet not fully punctured (in critical damage state). Measurement data can be recorded, stored and displayed in real time, and an automatic alarm will trigger for low-resistance insulators.
HF-LT-304 Wireless Live Insulator Resistance Tester features high measurement accuracy, wide measuring range, easy portability and simple operation. It is ideal for fast and precise resistance testing of disc suspension insulators in service.
Working Principle
During testing, the transmitting unit is firmly mounted on an insulated hot stick. The tip of the hot stick contacts the tested insulator to collect insulation resistance signals. Analog signals are converted into digital signals and transmitted to the handheld receiver via radio frequency. The receiver processes the digital signals and displays real-time results on screen.
Applicable Standards
- DL/T596-2021 Preventive Test Code for Electric Power Equipment
- DL/T626-2015 Code for Testing Deteriorated Suspension Insulators
Judgment Criteria
- Voltage level 500kV and above: Insulators with resistance below 500 MΩ are defined as deteriorated insulators.
- Voltage level below 500kV: Insulators with resistance below 300 MΩ are defined as deteriorated insulators.
Packing List
| No. | Description | Qty | Unit |
|---|---|---|---|
| 1 | Main Transmitter Unit | 1 | Pcs |
| 2 | Handheld Wireless Receiver | 1 | Pcs |
| 3 | Charger for Transmitter & Receiver | 1 | Set |
| 4 | Connection Fittings for Insulated Hot Stick | 1 | Set |
| 5 | USB Data Cable | 1 | Pcs |
| 6 | Operation Manual (Chinese & English) | 1 | Copy |
| 7 | Factory Calibration Certificate | 1 | Copy |
| 8 | Portable Carrying Case | 1 | Pcs |
FAQ for Live Insulator Resistance Tester
Q1: Can this tester work while the transmission line is energized?
A1: Yes. It supports live-line testing without power cut, suitable for on-site inspection of operating suspension insulators.
Q2: What judgment criteria are adopted for deteriorated insulators?
A1: For 500kV and above lines: resistance ＜500 MΩ is judged as deteriorated insulator;
For lines below 500kV: resistance ＜300 MΩ is judged as deteriorated insulator.
Q3: How does data transmit between the probe and handheld receiver?
A3: It adopts wireless RF transmission. The transmitter collects resistance signals and sends data to the handheld receiver in real time.
Q4: Can it detect insulators with leakage current but not completely punctured?
A4: Yes. It can accurately identify insulators under critical damage state before full puncture, avoiding potential flashover risks.
Q5: Will the instrument alarm automatically when low-resistance insulators are found?
A5: Yes. It triggers automatic alarm once low-value deteriorated insulators are detected.
Q6: Does the device support data storage and review?
A6: Measurement results can be recorded and stored in real time for later checking, analysis and report making.
Q7: Is the insulated hot stick included in the standard package?
A7: The insulated operating stick is an optional accessory and not contained in the standard packing list.
Q8: What kinds of insulators is this tester applicable to?
A8: It is specially designed for disc suspension insulators on overhead transmission lines.
Q9: Which industry standards does the instrument comply with?
A9: It complies with DL/T596-2021 and DL/T626-2015 standards for power equipment testing.
Q10: What are the advantages of this equipment?
A10: High measuring precision, wide measuring range, lightweight and portable, simple operation for quick field inspection.
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