C Charz Member Location Texas Nov 24, 2025 #1 When/Why do you provide a multifunction relay (27, 81, 59) in the bus VT Panel? What is the purpose of it?
When/Why do you provide a multifunction relay (27, 81, 59) in the bus VT Panel? What is the purpose of it?
J jim dungar Moderator Staff member Location Wisconsin Occupation PE (Retired) - Power Systems Nov 24, 2025 #2 The protective relay needs PT/VTs in order to work, so it makes sense to put them near each other. The multifunctionality lets you choose which protective functions to use, such as undervoltage and phase loss.
The protective relay needs PT/VTs in order to work, so it makes sense to put them near each other. The multifunctionality lets you choose which protective functions to use, such as undervoltage and phase loss.
