Demonstration of the OMICRON stator core measurement solution

OMICRON’s Stator Core Measurement Upgrade Option ensures time-saving and highly reliable electromagnetic imperfection testing (also known as a stray flux measurement). This offline test, which is performed during maintenance outages, reliably detects interlamination imperfections in the stator core of rotating electrical machines, including hydro generators, turbo generators and industrial motors. These imperfections can cause overheating and damage in generators and motors during operation, and lead to eventually failure if not detected in time. Regular measurements are recommended to assess the insulation integrity between stator core layers over time. Used together with OMICRON’s portable CPC 100 multi-functional testing device for both energizing the stator core and operating the measurement, this complete solution provides you with a frequency-selective, highly-sensitive and efficient measurement approach. The measurement sensor automatically moves along a mounted rail, scanning the entire length of the stator core surface below. The rail can easily be repositioned to scan other areas of the stator core. Reports, including a heat map showing defect locations, can be automatically generated on site with a single mouse click.

More information about this solution at: omicronenergy.com/stator-core-testing

Discover all solutions for rotating machine testing and monitoring at:
omicronenergy.com/machine-testing

In this video, Felix Feustel, the product manager of the OMICRON VOTANO 100 talks about the new features in version 2.30. These include a capacitive voltage transformer (CVT) capacitance divider test, an import reference excitation curve, a custom burden distribution and the capability to consider the lead resistance.

Learn more about VOTANO 100: www.omicronenergy.com/votano100

In electrical substations of higher voltage levels, capacitor voltage transformers, also called CVTs, or CCVTs, can be found.

VOTANO 100 now uses a new method that can determine the capacitances C1 and C2 on all CVT designs, combining two variable-frequency measurements at low voltage. It injects a constant current into the secondary winding and measures current and voltage accordingly. The first measurement determines the frequency dependent short-circuit impedance including C2.

The second measurement determines the frequency dependent short-circuit impedance including C1 and C2.

From both measurements, C1, C2, the capacitive ratio Kc, and the total capacitance Cr can be calculated. This method for measuring the CVT capacitance is integrated as a new test in VOTANO 100. VOTANO 100 can measure both the capacitance and the accuracy of the CVT, which is ideal for diagnostic purposes.

Learn more about VOTANO 100: www.omicronenergy.com/votano100

Testing and calibrating voltage transformers with a model-based test device has many benefits. Calibration used to be costly and laborious, when nominal voltage injection was the only measurement method with sufficient precision. Now voltage transformers up to the 0.1 accuracy class can be calibrated using VOTANO 100.

Interested in voltage transformer testing? – Watch all of our voltage transformer videos: www.youtube.com/playlist?list=PLzmbZeI1bhu-I9uR6RTx5-hERpBs0Cjty

More information: www.omicronenergy.com/en/products/votano-100/

Voltage transformers are used around the clock throughout the energy grid, and their life span can reach up to 40 years. During that time, the effects of aging, regular operation, network faults, or external influences may affect the integrity of a voltage transformer. Utilities perform various tests during commissioning and maintenance to find any irregularities that have been caused by transportation, installation or daily operation.

Interested in voltage transformer testing? – Watch all of our voltage transformer videos: www.youtube.com/playlist?list=PLzmbZeI1bhu-I9uR6RTx5-hERpBs0Cjty

More information: www.omicronenergy.com/en/products/votano-100/

Potential transformers, or voltage transformers, must accurately reflect system conditions for revenue metering, protection, load control or similar applications. Calibrating a voltage transformer means determining its accuracy and respective error according to the applicable standard. Accuracy classes are defined by international standardization bodies such as the IEEE and the IEC. OMICRON’s VOTANO 100 uses a modelling approach for verifying the accuracy of inductive and capacitive voltage transformers.

Interested in voltage transformer testing? – Watch all of our voltage transformer videos: www.youtube.com/playlist?list=PLzmbZeI1bhu-I9uR6RTx5-hERpBs0Cjty

More information: www.omicronenergy.com/en/products/votano-100/