Main and transfer buss

[mbrooke]

Ok, this is really throwing me off. 6 115kv line bays and two transformer bays. How do I get the transfer bus breaker to substitute any of those positions? :?

 

[Sahib]

What about a breaker and a half configuration?

 

[mbrooke]

What about a breaker and a half configuration?

Costs more, but will it be easier to relay?

 

[Sahib]

Costs more,

But it is a standard configuration in a bulk supply substation on National grid.

 

[mbrooke]

But it is a standard configuration in a bulk supply substation on National grid.

Perhaps where you live for a variety of reasons, but it might not be worth the extra cost or complexity in this case. Aren't the majority of Grid substation in India main and transfer at 132kv?

 

[Sahib]

In fact, in a National grid system (of USA), a breaker-and-a-half configuration is the preferred substation arrangement for newsubstations with an ultimate layout expected to terminate greater than four majortransmission elements.

Is yours one such?

 

[mbrooke]

In fact, in a National grid system, a breaker-and-a-half configuration is the preferred substation arrangement for newsubstations with an ultimate layout expected to terminate greater than four majortransmission elements.

Is yours one such?

For some POCOs in the US it is a standard rule in general and where reliability dictates, but ultimately it boils down to the application at hand. This station may get 2 more lines latter on, but it may never fully pay off. Unless you know something about breaker and a half paying off over main and transfer?

 

[Sahib]

For some POCOs in the US it is a standard rule in general and where reliability dictates, but ultimately it boils down to the application at hand. This station may get 2 more lines latter on, but it may never fully pay off. Unless you know something about breaker and a half paying off over main and transfer?

As you say, breaker and a half configuration is more reliable than main and transfer bus configuration. If your substation is new, of bulk power supply, and part of National grid, you may have to adopt breaker and half configuration (in your case) per article 5.3 and 5.3.1 on page no.22&23 of (See also 5.3.4)
https://www9.nationalgridus.com/non_html/transmission_planning_guide.pdf

 

[mbrooke]

As you say, breaker and a half configuration is more reliable than main and transfer bus configuration. If your substation is new, of bulk power supply, and part of National grid, you may have to adopt breaker and half configuration (in your case) per article 5.3 and 5.3.1 on page no.22&23 of (See also 5.3.4)
https://www9.nationalgridus.com/non_html/transmission_planning_guide.pdf

Thanks, you really are gifted in this area!

This station right now is not classified as a bulk power station or meeting PTF criteria, so main and transfer is acceptable for now.


In India, how do you get the bus tie breaker to substitute other bays and equipment?

 

[mbrooke]

As you say, breaker and a half configuration is more reliable than main and transfer bus configuration. If your substation is new, of bulk power supply, and part of National grid, you may have to adopt breaker and half configuration (in your case) per article 5.3 and 5.3.1 on page no.22&23 of (See also 5.3.4)
https://www9.nationalgridus.com/non_html/transmission_planning_guide.pdf

Look it it like this, I am under 5.3.4 in this case.

5.3.4 Straight Bus


Many older substations on the system have a straight bus configuration, with each
element terminating on the bus through a single breaker. Variations exist in which the
bus is segmented by one or more bus-tie breakers, provisions are provided for a transfer
bus, or the ability exists to transfer some or all elements from the main bus to an
emergency bus. Periodic transmission assessments shall consider whether continued
use of existing straight bus configurations is consistent with maintaining reliable
operation of the transmission system.
New bulk power system substations shall not utilize a straight bus design. Straight bus
designs may be utilized at non-bulk power system substations subject to the following
conditions:

• A transfer bus is provided to facilitate circuit breaker maintenance.

• The transfer breaker protection system is capable of being coordinated to provide
adequate protection for any element connected to the bus.

• Justification is provided to support deviating from the standard breaker-and-a-half,
breaker-and-a-third, or ring bus configuration.

• All requirements of Section 5.2 are met.

 

[Sahib]

Then what is your problem?

 

[Sahib]

Aren't the majority of Grid substation in India main and transfer at 132kv?

In India, how do you get the bus tie breaker to substitute other bays and equipment?

I have to study. Give me some time.

 

[mbrooke]

I have to study. Give me some time.

I will Let me know what you find, I know it will be worth gold, thats for sure :happyyes: You have tremendous knowledge in this area.

 

[mbrooke]

Then what is your problem?

BTW Sahib, I think you might find this interesting



http://www.bsptcl.in/SingleLineDiagram.aspx