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I have a factory motor of 710kW at 6.6Kv. A VFD will be installed, but I already have a SEL 710 relay above. Would you like to know that only the 50/51 functions are enough for VFD protection?

Thank you for your help. I would like to understand, because the relay cannot do this protection? The contactor is from ABB model VSC7/P and with an ABB REM 610 relay, would this relay not send a signal to the contactor and with that the contactor would turn off? or because of the high...

I have a doubt, I hope you can help me. My client has a vacuum contactor with a fuse to protect a 1800kW motor, but this fuse was removed and copper bars were installed in its place. This fuse protects against short circuit, correct? (function 50). If I install a relay with 50/51 functions...

Good morning everyone! I have a doubt about how the adjustment is made in the RSAS 3750 relay. Example: TC - 500/5 Ip - timed starting current scale 1 - 2 steps 0.2 With this I can adjust the KpA / KpB / Kpc to 1/1.2/1.4/1.6/1.8/2 We have the equation Ip = Kp x In Therefore, if I select 1.2, the...

Thanks for the answer, just wanted to understand if the relay is set to 0.1 and T2s will the curve have a time of 0.2 s or the curve will be at 0.1?

Good morning, I have a question regarding the RACIC relay (ABB). If I set it to 0.1s, there is a multiplication factor of T=2s. With that my time would be 0.2s?https://files.engineering.com/getfile.aspx?folder=365d70b1-e10b-4ba2-89e1-a4ecf980f138&file=RACIC.png

Thank you all for your help

Please, would you let me know what is the best way to adjust the 50 / 51G protections?

Just one more question. These are the relay settings as shown in the image. 51G pick-up = 0.4 (40A) 51G time delay = Set time 0.5s 50G pick-up = 0.4 (40A) 50G time delay = Set time 0.01 The 50G protection, should it follow the same thinking as the 51G protection?

I understand, thank you. But that way the circuit was not uncoordinated? because both are with 40A current.

Hello, I'm having a doubt about the 50 / 51G protection settings. My system has a transformer (138kV - 6.6kV) with an RGB limited to 400A. All connections are with CT involving the three phases. Thinking about a protection between two relays what would be the best way to protect the medium...

Example: In the image, there is a relay above (red curve) to protect the bus, this relay has the 50N function disabled. And a relay below (green curve) that is protecting a transformer. Is it correct to leave the 50N function disabled?Example: In the image, there is a relay above (red curve) to...

Hello, I have a question about bus protection. Can I leave the 50N function of my relay 1 disabled? What are the recommended settings for 51N protection? Can someone please help me about 50 / 51N...