Good or Bad practices
Good or Bad practices
(OP)
Hi,
I have seen many installations where the star point of MV alternators are high impedance grounded. There are nothing uncommon with these practices and they are done almost all the times. What is uncommon is that when the alternator is not in service, the network works ungrounded. I just came across one of these installations. I am of opinion that when an alternator or alternators are connected to a common bus, the best practice is to earth the network through a neutral earthing compensator fitted to a service transformer on the network to avoid the ungrounding issue.
Any comment ?
Grundig
I have seen many installations where the star point of MV alternators are high impedance grounded. There are nothing uncommon with these practices and they are done almost all the times. What is uncommon is that when the alternator is not in service, the network works ungrounded. I just came across one of these installations. I am of opinion that when an alternator or alternators are connected to a common bus, the best practice is to earth the network through a neutral earthing compensator fitted to a service transformer on the network to avoid the ungrounding issue.
Any comment ?
Grundig






RE: Good or Bad practices
RE: Good or Bad practices
If you have MV star connection so you will get neutral floating that can affect single phase load and your alternators start. In case, you decide to put neutral earthing compensator / resistor the value of that to be coordinated with inductance/capacity of the network, especially on non-loaded condition.