PRODUCTS

Relay Testing

System Description

All the test systems of the ARTES II product range have been especially developed for operation and transport in adverse conditions. The high degree of system integration has resulted in a compact design with a portable 19" test case. The ARTES II hardware is constructed entirely using the latest 32/128 bit DSP technology.

The test values are calculated from the parameters entered via the software and are applied to the device under test via high-accuracy D/A converters and amplifiers. The synthetic generation of test values guarantees immunity to fluctuations in the main supply.

The reaction of the protection relay is measured in real-time, synchronously to the signal generation process and the results are evaluated directly. Thus, for example, during a complete ARC (Auto Reclose) test sequence, the OPEN command from the protection relay is used to switch off and the RECLOSE command is used to reactivate the predefined short-circuit fault currents.

The powerful current and voltage amplifiers are electronically overload and short-circuit protected. Linear opto-couplers (LOC technology) are used for the galvanic separation of the measurement inputs.

All connections for linking up the device to be tested are arranged ergonomically on the front panel of the case for easy access. The binary inputs are protected against polarity reversal and can be configured as wet or dry contacts.

The high accuracy of the test systems can be optionally verified by a DKD certificate via an accredited calibration DKD-laboratory.

Signal Generation

The relay test systems of the ARTES II product generation have up to four voltage and six current signal sources with a very high output power. The supply voltage of the 25 A current amplifiers can be automatically adjusted from 4 V to 30 V by the operating programme. This means that even with low test currents, the current amplifiers can provide a high output voltage and thus a high output power. The parallel operation of the current amplifiers makes even test currents of up to 75 A / 600 VA possible. This means that all kinds of electromechanical relays, over-current relays and differential protection relays can be tested without any additional units.

In addition, special high-accuracy, low-level outputs make it possible to test protection devices with low-level signal inputs. The behaviour of different sensors, such as Rogowski coils, can be exactly simulated in this connection.

In addition, the protection device under test can be addressed with binary signals as well as analog values. These are generated synchronously to the analog values and can therefore give control commands to the protection device during the test.