I need your help. At the present time I'm working with GE Metal-clad Switchgear with GE Magneblast Power Circuit Breakers. I have the following questions:
1) One switchgear has Power Circuit Breakers type AM-4.16-250-6H and the other AM-4.16-250-9H. We are planning to replace the first one and...
There is a protection named "Tank earth leakage", which sense the current to earth through a current transformer connected between the tank and ground. Overcurrent relay is necessary also. In this case it could be between the core and ground.
As an example see...
The prime cause of distress in a motoring steam turbine is the temperature rise due to the windage losses.
Thus, in the steam turbine, besides the 32 device, there should be a temperature sensing device located in the exhaust hood as auxiliary protection. The device setting is about 250°F to...
Transformer is a bilateral circuit element at the nominal voltage value. That means if you excite with an input signal V1 at primary side and get an output V2 signal at the secondary side, then input V2 at the secondary you will give V1 at the primary.
The key issue for the application of the...
Busbar protection is not applicable to Mesh bus because the protection zone of each circuit connected to the busbar includes part of the bus. In other words, there is no dedicated relay to the Busbar and of you have a fault in the bus, the corresponding circuit will trip the breakers to clear...
Very good explanation about this matter.
The other key póint is to select the discount rate.
Gib1 mentioned 5% as an example, but you should use the cost of the money for your company
Thank you for your comments. As you mentioned, although there could be a general criterion to evaluate the technical bid documents, there is no universal "cookbook" approach to substitute good engineering practices. Anyway some checklist is necessary to implement.
Sirs
I’m working as part of a team to develop new budgeting procedures for EPC projects, which should be lump sum contract. Our concern is about the bid documents, which normally includes basic engineering but many sections only have conceptual engineering. In this way, there is not enough...
Sirs
I’m working as part of a team to develop new budgeting procedures for EPC projects, which should be lump sum contract. Our concern is about the bid documents, which normally includes basic engineering but many sections only have conceptual engineering. In this way, there is not enough...
The purpose of Surge Arresters is to protect the substation equipment. Main equipment is usually the Power Transformer, therefore the proper arrester location should be nearest to the transformer. Arrester will drain surges and the wave profiles along the substation will have suitable values...
