I have the following arrangement to protect the cable and three transformers (see attachment.). The analog inputs are limited to four and so I plan to sum currents from the CTs on two transformers. The transformera are 132/33 kV Trafos; 2xYNyn0 and Dyn1. How effective is this scheme and will it...
I have a relay that has faulted on the digital to analogue converter circuit for the red phase, High voltage side. I can't get a replacement immediately but need to normalize the circuit urgently. I would like to connect the differential relay to work on red and blue phase currents only as I...
We have a client with a generator of rating 500 Kva generating at 415 volts. There are 3 transformers hooked to the 415 bus of ratings 630 Kva, 630 Kva and 1 MVA, 415/11kV, 415/11kV and 415/33kV respecively. The 33kV line is 40 km long. Any suggestions on how to protect the system adequately is...
Hallo guys,
Just wondering which side of CTs for distance protection shoul be shorted. If the VTs used are located on the busbar should the shorted side be towards the bus for the relay to look forward?
Hallo guys,
Any one with an idea of how to test the reach and element characteristic of MICOM P442 distance relay from ALSTOM T&D.
Thank you in advance.
Hallo guys,
I have a scheme whereby the neutral of a 23MVA 33/11kV trafo has only one neutral CT (BUSHING) of class X. The incomer breaker too has class X CTs. I want to use ICT to be able to use the single bushing CT for both SBEF and REF.
Is it safe to use the ICT or is the REF alone...
I am relatively new in this field but I have been assigned a duty to train some of our client's on application of various relays on protection of industrial motors and associated transformers. I need help, may be with literature or specific notes on application of the above please.
Than you guys.
We do have a client metered on 11kV. The facility is fed via two 11kV lines, initially supplied via a single feeder,A. Feeder B was on stand by but could be connected to the bus via an airbreak switch when A had a permanent fault. A changeover using voltage as the actuator was used. Both lines...
