Protection History

Relay Testing – Test Sets and testing Technology in the 1980s

by Walter Schossig, Germany, and Thomas Schossig, OMICRON electronics GmbH, Austria

Further developments in protection testing resulted in portable devices, especially for distance protection, directional earth fault relays, generator protection and railways auxiliary functionalities. Some of them have been mounted directly in the cubicles. This was also valid for testing devices. Figure 1 shows such an example of Sprecher + Schuh (Austria, 1980). This device allowed simple and fast check of primary relays types MU, MT and MUT at nominal currents of 300 A with testing values of up to 2000A. The scales allow testing of 3rd party devices as well. The synchronous chronoscope came with microswitches (±6 ms) for exact measurement. To allow easy transport and operation the device was divided into 3 portable units. A dolly could be used for transport. More

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