The CMC is controlled via a PC or laptop computer. Compatibility is a very important design principle. The software provided with the latest CMC, can also be used to control all existing CMC models. In manual operation mode, the setting of voltage and current values, phase angles, and frequencies can be done either numerically or directly in the vector diagram
The CMC stores all output values, including magnitudes, phases, and frequencies, as well as all changes to the binary inputs together with the associated timings. It also allows for the addition of user comments, and the inclusion of diagrams.
As well as manual testing, the CMC offers a variety of automated testing possibilities especially designed for individual protective functions. In particular, the CMC can be utilized to comprehensively test the protective functions of overcurrent relays, distance relays, or differential relays. In addition to these, there are many other pieces of software individually designed for testing particular protective functions, providing a system capable of testing almost all types of power system protection devices.
Through its outstanding precision, the CMC 256plus can be used for the calibration of many measurement instruments. All common types of energy meters can be tested. Furthermore, the CMC allows simulating power system conditions and thus measuring the output signals of transducers.
In modern power systems, measuring power quality has become increasingly important. Power quality measurement devices need to be periodically calibrated to ensure their continued accuracy. The CMC is capable of simulating various power quality phenomena, such as power system frequency changes, flicker, sags and swells, transients, voltage imbalance, harmonics and interharmonics.
EnerLyzer is a software option for the CMC 256-Plus and CMC 356, which enables powerful analog measurement functions. It offers 4 modes of operation: multimeter, harmonic analysis, transient recording and trend recording. It allows each of the ten measurement inputs of the CMC to be reconfigured for measuring voltages of up to 600 V or, via shunts or current clamps, it can also measure currents.
Using GPS or IRIG-B based synchronization, several CMC's can be used together to allow the user to test phasor devices. Synchronization of CMC units at either end of a power line permits the verification of communication-based distance protection schemes, or line differential protection. OMICRON has also been a driving force in providing testing solutions which utilize IEC 61850 and the UCA2 standards.
Tan Delta Power Factor Testing
Background
In this video you will learn about means to measure the quality of the insulation of power transformers and bushings, such as power factor or dissipation factor measurement, and measuring capacitance. Possible causes for a reduction in insulation quality are also explained.
This video shows the progression of power factor or dissipation factor over frequency. Furthermore, measuring transformer winding insulation, including the connection of measuring leads, is explained. Reasons why recording frequency responses is important for a correct diagnosis of a transformer winding are discussed.
This video emphasizes the importance of regular measurement of bushings. It shows the influence of humidity, and explains why measuring at different frequencies is essential for meaningful measurement results. Moreover, it shows what can happen to a bushing, or a whole transformer, if regular measurements are neglected.
This video shows the most important benefits users of OMICRON's transformer diagnostic system experience. It explains advantages of features designed for accurate and user-friendly transformer diagnosis. An example shows the advantage in using the measurement inputs A and B with internal switching matrix to enable several measurements without reconnecting the test leads.
In this video you will learn how users benefit from easy and fast measuring with templates within OMICRON's transformer diagnostic system using the CPC 100 and the CP TD1. Defining test templates, downloading them to the test device, uploading of measured values from the test device to the PC and analysis of the data after the test is shown.
