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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...

Thank you guys.

The transformer is 5 MVA and the relay is numerical, a micom P631

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...

The system is islanded i.e not connected to the grid and total load is about 300 Kva presently. The client is planning to add another generator of the same capacity as demand increases.

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.

REF is high impedance

Thank you guys for the advice. Sorry, the trafo should be YNyn0 with the LV side solidly grounded. Punglu? Draw attention to him... Had similar configuration in a previuos thread. May be draw attention.

Thank you Marmite. I have also been contemplating the use of the 2 relays in series as shown in the Acad drawing attached. Any comments please. I cant get a neutral CT at the moment but the trafo must be energized on Friday since some clients are out of...

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...

In the applications I have come across, the voltage is actually monitored just after the fuse. You may use continuous rated contactors. The condition of an MCB NOT tripped must also be met to alarm. Variuos manufactrurers have such contactors. I haven't come across a compact unit/relay for fuse...

Which type of fuse? At what voltage? Which application do you have in mind? MV/LV protection fuse, control circuit, input to relays e.g distance? Shedd more light plz

Thanks Slava

interested in the arresters used in 33kV Systems

Hallo, Anybody who knows any link on the above subject. Any material on surge diverters and detecting failures on the surge diverters.

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.

The notations given are all for convenience. When you are working and you need for example to parallel to circuits or transformers, the notation will make it easier.Whether A,B, C or R,W, B Or R,Y,B. Depending where you come from.. You acn use the many instruments available and you will...

Guys, The solutions are good but bear in mind too that an outage to may be check and swap the secondaries of CTs is not an option. Bear in mind the bus cannot be shut down and any work MUST be carried out live...