Developed as an extension for the ACTAS C switchgear testing systems, it combines maximum measurement accuracy with integration into automated test sequences. The PROMET CE delivers constant test currents of up to 200 A, enabling a precise measure of electrical resistance and reliable assessment of contact behavior under realistic conditions.
The PROMET CE is powered and controlled directly via the ACTAS system. This guarantees uncomplicated handling without additional control elements or power supplies. All test parameters are set in the ACTAS test software and the results are transferred to the test reports.
With a variably adjustable test current of up to 200 A, PROMET CE covers a wide range of applications. The highly stable current source enables constant measurement conditions, so that even resistances in the micro- and milliohm range can be reliably measured, providing a highly accurate resistance measure for diagnostic purposes.
PROMET CE really shows its strength when used with dynamic switching tests: Contact resistances can be precisely measured and compared under realistic operating conditions. This is an essential basis for assessing the condition of modern switching devices.
High-precision test system for carrying out fully automatic function tests on various types of switchgear device, including circuit breakers, disconnectors or earthing switches, regardless of the type of drive unit.
FAQ
In high-voltage circuit breakers, the contacts consist of a main contact and an arcing contact. The main contact conducts the current during operation and, due to its large contact area and conductive material, usually copper or silver alloys, has a very low contact resistance in the range of approximately 10⁻⁶ to 10⁻⁴ ohms. The arcing contact takes over the arc during the switching process and consists of a resistant material such as tungsten-copper, which means its resistance is slightly higher. When the breaker is closed, the arcing contact initially takes over the current flow, followed by the main contact. When the breaker is opened, the reverse occurs. This protects the main contact from arc erosion and keeps the total resistance of the breaker low.
The resistance of a circuit breaker is measured to check the condition of the contacts.
In static resistance measurement, a constant test current is applied to the breaker in the closed state, and the contact resistance is calculated from the current and voltage.
Dynamic resistance measurement is performed during the switching process and records the resistance over time. This allows for a more accurate assessment of contact movement, overlap between the main and arcing contacts, and possible contact faults.
If you are still unsure whether the resistance measurement systems are right for you, we offer various options to provide you with the best possible support:
Feel free to contact us - we will help you find the best solution for you!
