Heat Extension Tester

The Heat Extension Tester is designed to measure the elongation and deformation of electrical wire and cable insulation and sheaths under combined heat and load conditions. It evaluates the thermal elongation performance of wire and cable insulation and jackets, ensuring compliance with industry standards and production requirements.

Application

(1) Insulated power cables – assess thermal elongation of 1 kV to 35 kV extruded insulation cables.

(2) Overhead insulated cables – verify performance under thermal and mechanical stress.

(3) R&D laboratories – test new insulation and sheath materials for thermal stability.

(4) Quality control in cable manufacturing – ensure compliance with production standards.

(5) Electrical certification and factory inspections – required for production license renewal.

Standards

(1) GB/T 2951.21-2008 – Electric cables with extruded insulation, thermal elongation test method

(2) GB 12527 – Power cables insulation thermal extension requirements

(3) GB 14049-2008 – High-voltage cable insulation test methods

(4) GB/T 12706-2002 – Rated voltage cables (1 kV to 35 kV)

Parameters

Features

(1) Measures elongation and deformation of insulation and sheath under heat and load.

(2) Multiple clamp and hanging systems for simultaneous testing of three samples.

(3) Wide range of precision weights to simulate different load conditions.

(4) Stainless steel measuring rods ensure accurate elongation readings.

(5) Suitable for cables ranging from low to high voltage (1 kV–35 kV).

Accessories

(1) Set of upper clamps

(2) Set of lower clamps with hanging pans

(3) Stainless steel measuring rods

(4) Hanging rod

(5) Full set of calibration weights

(6) Test hanger

(7) User manual and calibration guide

Test Procedures

(1) Secure cable samples in the upper and lower clamps.

(2) Attach appropriate weights to simulate the required load.

(3) Place the sample in the heating environment according to the test standard.

(4) Observe and record elongation and deformation using the measuring rods.

(5) Repeat the measurement for all three samples.

(6) Analyze the results to determine thermal elongation performance.

Maintenance Information

(1) Keep clamps, rods, and pans clean and free of debris.

(2) Store weights in a dry environment to prevent corrosion.

(3) Regularly check clamps and rods for alignment and wear.

(4) Calibrate measuring rods and weights periodically.

(5) Ensure the heating system is functioning properly and temperature settings are accurate.

Conclusion

The Heat Extension Tester provides precise measurement of wire and cable insulation and sheath elongation under heat and load, essential for quality control, R&D, and compliance with national and industry standards for power cables.

FAQ

(1) What is this product?

It is a testing device for measuring thermal elongation of wire and cable insulation and sheaths.

(2) What is this product used for?

It evaluates how insulation and sheath materials deform under heat and applied load.

(3) What is the working principle of this product?

Samples are clamped, loaded with weights, and subjected to heat; elongation and deformation are measured using precise rods.

(4) Why is this product important?

It ensures cable materials meet thermal performance requirements and maintain mechanical integrity.

(5) What industries is this product suitable for?

Cable manufacturing, electrical power engineering, R&D laboratories, and quality control laboratories for power and communication cables.