Core Competence
Quality Status
MQCP based on quality management system (ISO 9001)
MQCP : Manufacturing Quality Control Plan
Routine Test
Insulation Resistance
Polarization Index (PI)
AC High Voltage Test
AC Current Test
Dissipation Factor
Partial Discharge
Reliability Test
| Test Item (Applicable Standard) | Test Content | |
|---|---|---|
| 1 | Thermal Cycling Test (IEEE 1310) |
Insulation degradation evaluation under heating/cooling over 500 cycles Pre-test/ Intermediate test (test after 50/100/250 cycle)/ Main test (after 500 cycle)/ Post-test |
| 2 | Voltage Endurance Test (IEEE 1043, IEEE 1553) |
Check voltage durability by accelerating insulation aging with high temperature and high voltage Pre-test, endurance test (110 ℃) 400 hours at 3.76 times of phase voltage |
| 3 | Breakdown Voltage Test (ASTM D149) |
Increase the voltage by 5kV and test until insulation breakdown Voltage rise : 5kV/min |
| 4 | Water Immersion Test (HAEGANG ACE Standard) |
Check the insulation status with the roebel bar submerged in the water tank PI, Hi-Pot, dielectric loss tangent and partial discharge after 720 hours |
Specimen Test _Cut Section
Thermal Cycling Test
Water Immersion Test
2018.08.30 ~ 2020.09.10
After the End IR(1minute) : 275 GΩ IR(10minute) : 2.4 TΩ PI : 8.7Check the possibility of moisture absorption due to voids inside the main insulating layer
Prevention of deterioration of insulation performance due to moisture absorption Moisture absorption due to dew condensation when generator is stopped (in case of SPACE HEATER failure) Moisture absorption during long-term storage of spare parts (no need for moisture-proof packaging)
Pressurized Water Immersion Test
1.8 bar, 336Hours
| Item | Before | After | Remark |
|---|---|---|---|
| IR | 248 GΩ | 265 GΩ | IR > 0.1 GΩ |
| PI | 16.5 | 15.4 | PI > 3 |
Confirmation of moisture-proof of the main insulation layer of the stator winding even under long-term pressurized immersion conditions
Check the presence of air or moisture in the main insulation of the stator winding for voids and gaps
