The standard IEC 61850 [1] covers the communication in utility automation systems. More and more substations use a communication system according to this standard incorporating GOOSE and Sampled Values. This article describes Omicron's new test set, CMC 850, which was developed to fulfill the requirements of customers working in pure IEC 61850 environments
CMC 850
The CMC 850 is the first test set dedicated to IEC 61850. It focuses on the described real time communications utilising Goose and sampled values. The device is controlled by the well proven Omicron Test Universe software. Additional features can be accessed through a new web interface.
The device was developed for the IEC 61850 standard, working without classical secondary values. The result is a small and light weight device which is compact and easy to carry having a width of just 80 mm and a weight of only 1.7 kg. Conventional I/Os and analog outputs are not available.
The capabilities of CMC 850 regarding IEC 61850 are the same as their ‘big brothers' CMC 256-6, CMC 256plus, CMC 353, and CMC 356:
The CMC 850 has the capabilities of simulation and subscription of up to 360 data attributes up to 128 Goose messages, and the generation of up to three sampled values streams (one stream contains 4 currents and 4 voltages).
The supported sampled values version and more specifically the option with 80 samples per cycle is in accordance with the implementation guideline of the UCA International Users Group [2], (widely known as "9 2LE").
Additional Features
The device provides additional built-in functionality, which cannot be found in other CMC test sets. These functions are accessed with a normal web browser. One feature is the visualisation of received sampled values in a multimeter or oscilloscope view.
Subscribed sampled values are used to calculate the phasors, which are then provided as synchro¬phasors according to IEEE C37.118 [2]. Recorded network traffic (in PCAP-format) can be played back through the device.
Time Synchronisation
Time synchronisation is an important issue when dealing with sampled values. The CMC 850 is delivered with the CMIRIG-B interface which allows synchronization to IRIG-B or a pulse-per-second (PPS) signal. Time stamping of Goose messages and sampled values is made possible through the use of Net¬work Time Protocol (NTP) or Precision Time Proto¬col (PTP) according to IEEE 1588-2002, V1).
Segregation of Networks
The CMC 850 is equipped with two independent Ethernet-Ports.
Each of these ports can be used for controlling the test set with a local PC, or for sending/receiving Goose and/or sampled values. This allows maximum flexibility in the configuration and a segregation of IEC 61850 data combined with the control protocol for the test set.
Applications
The CMC 850 test set is perfect for use in the IEC 61850 environment. It is particularly suitable for use in the development of intelligent electronic devices (IEDs) and for factory and site acceptance testing. The device is also ideal for demonstrations of IEC 61850 IEDs and for training purposes.
Summary
Omicron was the first vendor to provide testing solutions for IEC 61850. This device, equipped for current and future testing in the IEC 61850 environment, is the result of vast experience, technical skill and collaboration with international standardisation committees.
Omicron
Tel: 01785 251 000
