Difference between tie breaker, yard breaker, HV breaker

[Saul_]

Hello guys,
Is there any difference between a yard breaker, a tie breaker, a 52L or an HV breaker. Too much name for the same thing?

 

[JG2828]

yard breaker - Outdoor breaker, in the substation yard.

tie breaker - Breaker used to tie two bus sections together.

52L - I have never heard of this one.

HV breaker - High Voltage breaker. From my experience in the US, anything above 69kv but I don't think there is a standard. This varies for different locations and industries.

 

[FreddyNurk]

Sometimes these terms are location dependent. HV can mean different things in different locations, as an example, HV is considered anything above 1kV in Australia, and as a result MV does not exist. MV, of course, does exist in a lot of other locations. IF MV exists in your location then it would be reasonable to expect that a HV breaker is higher than this.

EDMS Australia

 

[davidbeach]

All of those would be very location specific. 52 is an AC circuit breaker, 52L isn't defined in C37.2. Could be somebody's line breaker, just like we use 87L for line differential.

I'd mostly agree with JG2828. But different people have very different definitions of HV; there's folk that have dealt with 3-5V electronics all their life that consider 120V as HV and there's other people that don't start with HV until 69kV is in the rear view mirror. It really, truly, all just depends.

 

[crshears]

More or less what everybody else said.

Beyond that: by extension, the service for which a breaker is to be employed will dictate its specifications, in other words don't get to thinking that a breaker is a breaker is a breaker. By way of example, our utility routinely switches 230 kV capacitors with ratings > 400 MX in and out of service with independent pole operation SF6 breakers, but in most cases the normal IPO breaker has a second in series with it just in case the first breaker becomes inoperable. Where a second breaker has not been provided due to cost and/or lesser system impact, inoperability of the first breaker keys some "fancy footwork" [ read: idiosyncratic switching ] to remove said capacitor from service, often involving short-term load shedding, just to preclude equipment damage. And yes, due to the severe operating duty major damage will definitely occur if, for example, one attempts to remove such a capacitor from service with an oil circuit breaker; it has happened, and it isn't pretty.

Similarly, a yard or bus tie breaker may be called upon to interrupt greater fault currents than a dedicated line circuit breaker; indeed, as our utility's grid has grown and fault current infeed capability has risen in certain locations, it has become necessary to run with certain previously-closed yard tie breakers normally open.

Hope this helps.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[marks1080]

You can have a HV yard tie breaker. But not all HV yard breakers will be tie breakers, nor will all yard breakers be HV.... These terms are more describing the function of a breaker than anything too specific about the actual breaker.

 

[crshears]

Fair enough, marks1080; thanks for expanding on my response.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[Saul_]

Thank you guys. You made it clear to me