Client
Accredited Test Lab
Application
Power Capacitor Type Testing
Date
2015
Introduction
Power capacitors are essential for stability in high-power applications. To ensure their reliability, endurance testing under real-world conditions is crucial. The IEC 61071 standard specifies an endurance test for capacitors exposed to both AC and DC voltages, simulating typical operational stresses. This combined AC-DC test evaluates capacitor durability under simultaneous DC bias and AC ripple, helping detect potential failure modes. By validating performance in these conditions, manufacturers and users can ensure capacitors meet reliability requirements for demanding power electronics applications.
Challenge
For endurance testing of power capacitors, it is essential to apply both AC and DC voltages simultaneously. This is a significant challenge for a test system as it must supply and withstand high currents and voltages during the test. The setup requires two separate power supplies that must be independently adjusted and decoupled to ensure accurate test conditions. During the endurance test, there is a possibility that the device under test could fail or short circuit. The system must be robust enough to withstand such failures without damage. In addition, the high amount of stored energy poses a safety risk, so it must be properly discharged to maintain safe operation throughout the test.
OUR SOLUTION
Precise, Safe, and Remote-Controlled
Power Capacitor Testing
Power Capacitor Testing
Our Power Capacitor Test System is designed to meet the rigorous demands of life cycle testing for power capacitors, ensuring compliance with IEC61071 standards. The system applies both AC and DC voltages simultaneously to simulate real-world operating conditions. The system consists of an AC power supply and a high voltage DC power supply. The AC power supply has 3 voltage ranges and a passive inductive PFC to compensate the capacitive current. The DC power supply can charge the capacitor up to 2kV. Both supply voltages are superimposed and regulated independently. The system is completely controlled by a PLC and operated via an integrated touch display. Remote monitoring and control is available via Ethernet and web interface. This system is fully equipped with safety components according to EN 50191 and automatic disconnection and discharge to ensure maximum safety for the operator during daily work.
Highlights
Power Capacitor Endurance Test System with Superimposed AC and DC Voltages
Features
Power Capacitor Endurance Test System with Superimposed AC and DC Voltages
PLC Control
Automates the testing process to ensure accurate and consistent operation and control.
Touch Display
Allows easy operation and monitoring through an intuitive interface.
Web-based Remote Control
Enables remote access and management of the system over Ethernet.
Overcurrent protection
Protects the system and DUTs by preventing damage from failures during testing.
Automatic disconnection and discharge
Ensures safe operation by automatically disconnecting and discharging capacitors after test.
Safety equipment according to EN50191
Complies with strict safety standards to protect operators during testing.
Technical Specifications
| AC Power Supply | 1-Phase, 50Hz, 0…300V, 0…150A, up to 45kVA with PFC |
| Power Factor Correction | Automatic compensation of reactive load current with 10 steps |
| DC Power supply | 0…2kV, 0…100mA |
| Power Input | 3AC400V±5% 25A |
| Measurements | AC voltage, AC current, DC voltage, DC current |
| Dimensions | 2400x2100x600mm (WxHxD) |
| Weight | 1300kg |
