Protection History

Authors: Walter Schossig, Germany, and Thomas Schossig, OMICRON electronics GmbH, Austria

Testing Devices in the 1990s (Part 1)

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

In the last issue we moved through the 1980s. The decade after was amazing as well. A lot of portable and integrated testing devices were released. In the 1990s microelectronics became an essential part of the test sets. 
In this article we try to cover the most important devices. We are aware of the lack in completeness and kindly request the readers to excuse us for this.

A typical example is AVO's relay test set EPOCH-10. Launched in the 1990s it was a microprocessor based device (Figure 1 and table 1).
The device could be used for testing of single phase overcurrent, directional, distance and frequency relays. For testing differential relays and open-delta two devices had to be combined and for three-phase distance- and directional relays even three devices.

AJIT released several test sets in 1991. They could be used for testing relay startup times and operating times. The series was called RTS and AE (table 2). 
Figure 2 shows Relay Test Set AE 100 Automatic with CT test function and built in printer.
SMC in Spain introduced   COMPATEST1000 in 1992. (Table 3). (see Figure 3).

In Germany the utilities started to define requirements specification for “a new test set for protection devices.” The work was done at the “Relais- und Schutztechnik der Vereinigung Deutscher Elektrizitätswerke (VDEW).”  In 1992 they published this guideline:

“To test relays specialized devices will be needed. The devices under test might be electromechanical, static or digital. They can be overcurrent relays up to multisystem distance relays. Test sets, which will fulfill all requirements will not be accepted in the industry if they have huge dimensions. That is why the requirements must be justified, and some wishes might not be included. For lab use the requirements might be different. Electromechanical relays might need additional devices. The test set must be handy and robust. The weight should be less than 20 kg (with suite case). This is also valid for auxiliary devices such as amplifiers. The temperature range shall be between -25°C and 70°C for transport.”  Table 4 summarizes the most importan

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