How do you determine the sync window for closing in on induction motors? I came across a motor standard stating that you don't want V/Hz to exceed 1.33 (IEEE C50.41-2000) but I don't really have a way of determining how the system voltage and frequency decays to know how small I need to make...
I have an auxillary wye 1:1 120V grounded broken delta transformer that is feeding a Basler 59N relay. When I hooked up a test set to the secondary of bus PT's (15 kV:120V) I was seeing voltage any of the phases when I pulled it from the test set. I thought it was a wiring issue at first but I...
I am kind of confused as to what kind of work requires oversight from a PE. The group I work for does SCADA/HMI and power automation. Sometimes we are told how to set everything. Sometimes we take the power system studies create all the settings and logic in the relays to make it work...
Can you set a REF protection on a transformer that has high impedance resistive ground? I am looking in the manual of the SEL-787 and it looks like it says to not use it if you have a high impedance ground but later it mentioned it can be used on transformers with grounding resistors. Can you...
There are 4 types of transfer in the M-4272.
You have:
Fast Transfer - if you are synced your loads will be switched to the new source if under the time limit
In phase- the relay will attempt if it can a synced transfer when the motor voltage and new source voltage are near in synced...
