521AB
Electrical
- Jun 23, 2003
- 197
After several and repeated bad experiences, I would like to draw your attention on this aspect regarding the "new" methods of testing numerical relays.
The testing engineer goes in front of the relay and gets the RIO file from the relay. It imports the RIO file from the test-set software. It performs the test. Everything is Ok. After several days, the same relay gives unwanted trip because nobody checked that one distance zone was set in forward when it was supposed to be set in reverse.
Similar situation: test engineer goes in front of the relay and reads all the settings from the manufacturer software tool. From the software tool it generates the RIO file which is imported in the test-set software. Everythink is Ok. After some days, the relay does not trip because the engineer tested the relay when it was in setting group 3, when it was supposed to be in setting group 2.
In another thread we are discussing of standardizing the settings (for instance by means of IEC 61850) so that, for instance, test set manufacturers can "suck" all the settings from the relays by themselves and do not even need the RIO file passage.
Is that really the meaning of a relay test? Is really this that we need?
The testing engineer goes in front of the relay and gets the RIO file from the relay. It imports the RIO file from the test-set software. It performs the test. Everything is Ok. After several days, the same relay gives unwanted trip because nobody checked that one distance zone was set in forward when it was supposed to be set in reverse.
Similar situation: test engineer goes in front of the relay and reads all the settings from the manufacturer software tool. From the software tool it generates the RIO file which is imported in the test-set software. Everythink is Ok. After some days, the relay does not trip because the engineer tested the relay when it was in setting group 3, when it was supposed to be in setting group 2.
In another thread we are discussing of standardizing the settings (for instance by means of IEC 61850) so that, for instance, test set manufacturers can "suck" all the settings from the relays by themselves and do not even need the RIO file passage.
Is that really the meaning of a relay test? Is really this that we need?