Regular measurements of the contact resistance allow an accurate assessment of the condition of contact systems. Excessively high transfer resistances resulting from poor connections can be identified by measuring the static contact resistance with PROMET L100. This ensures that maintenance requirements can be identified at an early stage and downtimes kept to a minimum.
Contact resistance determination with earthing on both sides
Thanks to the parallel measurement of the earth current, the resistance can be determined precisely for the main contacts of switchgear devices even with earthing on both sides. The earth current is measured with a current clamp and automatically taken into account by the system during resistance determination. Not only would disconnecting the earth conductor make carrying out tests more complicated, but it would also be detrimental to safety.
Measurements on inductive loads
PROMET L100 has been designed for a number of applications, including measuring the resistance of inductive loads up to 1000 henries, such as HV, MV, and LV transformers, motors, and instrument transformers, for example. A special algorithm ensures that inductive loads are charged and discharged quickly, keeping measurement times short. The charging and discharging of the energy stored in the core are visualized on the display. The measuring device is also equipped with safety functions to protect against discharge arcs when current leads are disconnected.
Measurements with temperature compensation
PROMET L100 can determine resistances with temperature compensation. The temperature at the measurement point is measured using a sensor, and the resistance value is calculated by considering the reference temperature. A database with the parameters necessary for temperature compensation is saved in the device and can be extended as and when needed.
Integration in circuit breaker testing with ACTAS
PROMET L100 is equipped with interfaces for connection to ACTAS test instruments. The ACTAS testing software can easily integrate resistance measurement into circuit breaker tests. This makes it simple to automate tests and carry out a comprehensive analysis of the test results. The measured values are used for the evaluation of tests and are included in the test report. When used in combination with ACTAS, PROMET L100 can also carry out dynamic contact resistance measurements on up to three poles.
Simple and intuitive operation
The resistive, 5" touch screen with function keys allows intuitive operation of the measuring device and provides a clear display of test parameters and measurement results. Acoustic signals are an additional source of information and also provide feedback during settings.