Extreme Accelerated Aging Test of Cylindrical Capacitor

Extreme Accelerated Aging Test of Cylindrical Capacitor

Test Time	May 29, 2026 ~ Jun 1, 2026 (72 hours)
Test Location	Jinneng Electric Power Aging Test Room
Test Equipment	Constant Temperature Test Chamber + Finished Capacitor Product Durability Tester
Test Model	Cylindrical Capacitor BKMJ 525-15-3
Remark	This cylindrical capacitor was randomly taken from bulk mass production orders and has been aged for 72 hours at 1.4 times the rated voltage. In order to observe the state of the capacitor after failure,additional 72hours accelerated ageing test was carried out this time on the same unit.
Test Conditions	For the first 23.5 hours, ambient temperature 70°C / 1.5 times the rated voltage / 2.1 times the rated current; After 23.5 hours,in order to accelerate the cylindrical capacitor ageing process, the temperature of the constant temperature test chamber was adjusted from 70°C to 90°C

1.Before aging test(the status of capacitor)

2. Time: 7 m 37 s

The ambient temperature at workstation 1 is 73.7°C, the capacitor body temperature at workstation 2 is 60.9°C, and the three-phase current is 24A/23A/24A.

 

 

3. Time：3h 42m 52s

The environmental temperature at workstation 1 is 79°C, the temperature of the capacitor body at workstation 2 is 82.9°C, and the three-phase current is 24A/23A/24A.

 

 

4. Time：21h 59m 4s

The ambient temperature at workstation 1 is 80.7°C, the capacitor body temperature at workstation 2 is 85.4°C, and the three-phase current is 23A/23A/23A is

 

5.Time：24h 6m 1s(Half an hour earlier, in order to accelerate the aging of the capacitor, adjust the temperature of the test chamber to 90°C)

The ambient temperature at workstation 1 is 93.4°C, the capacitor body temperature at workstation 2 is 98.2°C, the three-phase current is 24A/23A/23A

 

6.Time：41h 2m 22s

The ambient temperature at workstation 1 is 93.7°C, the capacitor body temperature at workstation 2 is 99.3°C, and the three-phase current is 23A/23A/23A.

 

7.Time：64h 26m 19s

The ambient temperature at workstation 1 is 94.6°C, the capacitor body temperature at workstation 2 is 99.9°C, the three-phase current is 23A/22A/23A.

 

8.Time：71h 51m 3s

The ambient temperature at workstation 1 is 94.6°C, the capacitor body temperature at workstation 2 is 99.9°C, and the three-phase current is 23A/23A/23A.

9.Time：72h 0m 0s(test finished)

The ambient temperature at workstation 1 is 94.6°C, and the temperature of the capacitor body at workstation 2 is 99.9°C .

The capacitor status after the test is completed

 

 

10.The inter-phase capacitance was as follows after the test: AB 84.96, AC 85.08, BC 85.04. The capacitance loss was 0.018%, and the three-phase imbalance was only 1.0014.

Detailed Data of Extrime accelerated Aging Test Process
Test Time	Station 1 Ambient Temperature(°C)		Station 2 Capacitor Shell Temperature(°C)		Phase A Current(A)	Phase B Current(A)	Phase C Current(A)	Remarks
7min37s	73.7		60.9		24	23	24	Test Start
3h42min	79		82.9		24	23	24
21h59min	80.7		85.4		23	23	23
24h6min	93.4		98.2		24	23	23	Half a hour ago, the test chamber temperature was adjusted to 90°C
41h2min22	93.7		99.3		23	23	23
64h26min	94.6		99.9		23	22	23
71h51min	94.6		99.9		23	23	23
72h0min	94.6		99.9					Test Completed
Inter-phase Capacitance After Test
Phase AB Capacitance(uF)	84.96			Three-phase imbalance:		1.0014		(IEC standard≤1.08 )
Phase AC Capacitance(uF)	85.08			Capacity loss		0.018%		(IEC standard ≤3.0%)
Phase BC Capacitance(uF)	85.04

 

Test result：

 

• Based on the pre-aging treatment of 72 hours at 1.4 times the rated voltage, the cylindrical capacitor was further subjected to a triple superimposed extreme test condition, including 1.5 times the rated voltage, 2.1 times the rated current, and a high ambient temperature of 90°C. In actual industrial scenarios, such simultaneous superimposed extreme operating conditions rarely occur.
• The cylindrical capacitor successfully completed the 72-hour extreme accelerated aging test under conditions far more stringent than conventional industrial operating standards. After 72hours+72hours of continuous operation, the capacitance attenuation was merely 0.018%, and the temperature rise performance was well above premium industry levels.
• The cylindrical capacitor is capable of reliably withstanding common abnormal grid conditions, including voltage fluctuations, harmonic impacts, and overload shocks. This fully demonstrates the capacitor's superior design, high-quality material selection, and precise manufacturing craftsmanship.
• The cylindrical capacitor delivers outstanding reliability, operational stability, and overload resistance, significantly exceeding conventional industry benchmarks. It also features excellent three-phase balance performance, fully adapting to diverse complex and harsh operating conditions on industrial sites.