Composite hollow core insulators
EGU – HV Laboratory a.s. has been performing electrical and mechanical testing of insulators for decades. As hollow-core insulators represent special design within post insulators other tests are required also to fully qualify those products.
New tests according to IEC 61462 and IEC 62772 have been introduced to the company testing portfolio to cover the majority of the hollow-core testing range.
Testing facility:
- Composite hollow core insulators
Tests:
- Electrical and mechanical design and type testing
- Thermal-mechanical testing:
post - 50 kN / 2000 mm - Mechanical testing:
post - 50 kN / 2000 mm - Internal Pressure Test (design test):
Stage 1: Gas leakage test as per IEC 61462, cl. 7.2.5.4.1
Hollow-core insulator samples filled with a gas under required pressure
Tests done in a special sealed chambre
Gas leakage detection by means of a special detection device
On-line monitoring of gas leakage
Stage 2: Water Leakage Test as per IEC 61462, cl. 7.2.5.4.2
Test samples filled with water by means of a special pump up to SIP
Water leakage detection - Internal Pressure Test (type test):
Testing as per IEC 61462, cl. 8.4
Tests done at three stages » related to different maximum service pressures
Hollow-core samples filled with water by means of a special pump
Strain condition monitoring before and after the testing » special strain gauges
Housing material testing:
- salt fog, tracking wheel testing including leakage currents monitoring
- Housing material testing: fl ammability, UV, X-ray SEM / EDX – in cooperation with other external accredited labs.
Special mechanical testing:
- cantilever, torsion, compression and special mechanical testing in cooperation with an external accredited testing lab in Prague
Standards:
- IEC, EN, ANSI, AS, CAN
Activities at IEC and CIGRE:
- IEC TC 36/SC36C/PT
- IEC TC36/MT15
- CIGRE C4.3.03
- Cigre D1.44 / CIGRE D1.45