I'm looking for some vendor prints for a Siemens BZO-145-63-6 OCB. I am doing a relaying upgrade and need to utilize some more 52a and 52b contacts, so a print showing the aux contact wiring in the breaker would be very useful. I can't seem to find anything on-line. any suggestions on where I...
What do you mean by open circuit logic, open CT detection? What type of relay is Performing the Bus protection.
I'm just going to assume when you say open circuit logic, that you are referring to open CT detection.
In a normal Bus Differential scheme without the use of open CT detection...
Pulling vaccum on the transformer pulls moisture from the insulation layers around the core.
The filtration unit on the oil processing equipment removes particulate contamination (carbon, dirt.....etc)
The heaters on the oil processing equipment heat the oil up so that moisture can be removed...
I have a 13.8-4.16kV transformer (D-Y). The neutral is impedance grounded (400A @ 10 seconds). The transformer feeds a lineup of switchgear. According to 250.30(A)(1), Exception 2 of the NEC, is worded such that a wire type bonding jumper from the transformer enclosure to the "Incomming Main" of...
Hello All,
We have recently been purchasing the 800 series feeder protection relays (850) and transformer differential relays (845) per our customer specifications on some substation jobs. These relays have to be ordered with different firmware packages based on the relaying options that is...
Saturation occurs when the Primary CT current is so High (or above the accuracy rating) that it can not put out a secondary current in a linear fashion. Since your pickup is well below the "Knee" of the saturation curve, You will be fine.
This could cause an issue if say, you have a breaker...
