The performance test of toughened glass insulators includes electrical withstand tests, mechanical load tests, thermal shock, and pollution resistance tests. These tests ensure the insulator can withstand high voltages, extreme weather, mechanical tension, and environmental stresses while maintaining long-term reliability in power transmission systems. That’s how Nooa Energy make sure the high quality of each glass insulator we manufactured. That’s why Nooa is a qualified glass insulator supplier for State Grid Corporation of China and a leading glass insulator manufacturer for global EPC, distributors, agents, traders.
The performance test of a toughened glass insulator is a set of standardized tests conducted to verify whether the insulator meets electrical, mechanical, and thermal requirements for safe and reliable use in power transmission and distribution lines. These tests are generally in line with IEC 60383, IEC 61109, IEC 60305 and related national standards.
Below are the main performance tests for Nooa Enegy‘s toughened (tempered) glass insulators:
🔹 1. Electrical Performance Tests
Power Frequency Withstand Test (Dry & Wet)
The insulator is subjected to a specified AC voltage under dry and artificial rain (wet) conditions to check for flashover or puncture resistance.
Lightning Impulse Withstand Voltage Test
A standard impulse voltage simulates lightning surges; the insulator must withstand without flashover or puncture.
Switching Impulse Test (for UHV applications)
For extra-high voltage (EHV/UHV) lines, simulating switching surges.
Radio Influence Voltage (RIV) / Corona Test
Ensures that at operating voltage, corona discharge and radio interference remain within limits.
🔹 2. Mechanical Performance Tests
Mechanical Load (Tensile Strength) Test
The insulator unit is subjected to a tensile load equal to its specified mechanical load (SML) or higher to confirm mechanical integrity.
Mechanical Proof Load Test
Each insulator is tested at a fraction of its SML to guarantee manufacturing consistency.
Impact Strength Test
To confirm the toughened glass can withstand mechanical shocks without failure.
🔹 3. Thermal & Environmental Performance Tests
Thermal Shock Test
The insulator is suddenly exposed to high and low temperatures (e.g., immersion in hot water followed by cold water) to ensure resistance to rapid thermal changes.
Temperature Cycling Test
Repeated heating and cooling cycles verify durability in real operating conditions.
Artificial Pollution Test
Simulates polluted environments (salt fog, kaolin, etc.) to evaluate pollution flashover voltage.
🔹 4. Verification / Additional Tests
Visual & Dimensional Inspection
To confirm surface quality, absence of defects, and dimensional accuracy.
Electromechanical Failing Load Test
Combines electrical and mechanical stresses to confirm the design’s robustness.
Brittle Fracture Resistance Test
Ensures that the insulator will not fail catastrophically due to stress corrosion.
Nooa Energy: With 22+ electrical industry experience, covering an area of 70,000 square meters. There are more than 200 employees, including 25 technicians. And now, with 2 new kiln lines, the production capacity up to 10500000 pieces per year. However, Every toughened glass insulator has undergone strict testing before being delivered to our customers. To View More Tests of Toughened Glass Insulator, Please Follow Our Channel:
