I have been seeing a lot of new independent power producers and i am seeing new requirements for different types of set ups. I have not seen any conversations around set-ups where different types of renewables are used together.
Specifically when a single 35kV bus taking 5 feeders and 2 of...
Is there any books,articles or standards I can look at with regards with reclosing schemes for Breaker and a half or dual breaker applications?
My system is 240kV (North America) with A/B line protections. A doing the reclosing on each of 3 lines on a ring bus dual bus. Each breaker is 1-pole...
Hello everyone,
Just wondering what is everyone's experience with using a voltage sensing relay to close on a 138kV line/reclose. I don't think synch check is possible using one of this. If so, what is the approach one should take?
Is the only option to close by being the leading end?
Hello all,
I was wondering if someone could take a look at this picture and tell me their thoughts. I've been trying to understand what's happening here or if it's maybe just a mistake.
I have not been able to get a hold of the nameplate yet for the Station service TX. But is the primary...
Greetings,
Would anyone know of a standard for the installation, specifically height, of a ground bar for a switchgear or control building in an industrial scenario?
thank you.
hello all,
I cant find a specific rule on CEC about this...
Do you need a main CB for a subpanel sitting in an industrial site's yard? It is being fed from the main AC panel (inside of the building) through a 150A branch CB. Is there a rule that dictates you need to have a main CB in the sub...
Hello all,
Can anyone suggest any good literature about the CT thermal rating vs accuracy?
Question: if you have a CT with TRF of 2. whe you select CT ratio. Do you HAVE to consider it?
meaning: if you have a nominal current of 300A can you select the tap ratio of 400:5 or do you have to go...
Hello everyone,
I was told by our revenue meter vendor that the Pulse Weight (Kt) (energy/pulse) for the Alberta system is 1.84. Can anyone explain where this comes from? or guide me in the right direction?
I am told that Saskatchewan has a different value. this would be for a 35kV / 240kV...
I am questioning my coworker and he hasn't been able to give me a satisfactory answer either.
So, i am hoping to get an answer from here in hopes to understand it better and explain it or have it explained to me.
We have a system being fed from a station service TX. 120/208V 3-ph to our AC...
Hello everyone,
Our HVAC supplier is providing 2 HVAC units (BARD W36AA) 240V 15KW heating with one being 100% redundant. hey ome with a TEC40 controller which alternates teh units every 200hrs.
The problem is that this controller may activate both units if temperature falls below design...
Hello all,
After talking with one of our commissioning leads. He made the requests that if possible, to use Teck cable for control and power cables as they can strip them with relative ease.
Looking at some catalogs, i can see they come with a grounding conductor but no shield. Which is what...
hello.
I have a client who has 4 25kV feeder breakers connected to the 138kV bus via a ganged sw and a single 138kV main line breaker.
when sizing the battery bank he wishes to not do a "worse case" scenario. he wants to open and close ALL breakers after 16 hours.
This is a new one for me...
hello,
i have am beginnign design on a 240kV substation connecting a single line to the grid.
the sub will receive 10 x 35kV feeders from wind turbines. but i am wondering how people handle breaker fail ?
I have a bus protection, 240kV (main/line) protection and the feeder protections...
In a windfarm scenario, where each collector run is (sometimes) up to 10kMs. Does anyone have any experience with setting up fault detecting check points throughout these that does not involve splicing the run's midway and setting up fault detecting equipment? or perhaps somethign that would...
What is everyone's views on trips vs alarms from TX gauges.
example i have 2 PRD's one on a selector tank and the other on the diverter tank.
I saw in a double forum that some people have stopped putting these PRD's as trips because they get a lot of nuisance trips. But it seems to me these...
If the C60 can do synch check. ie: compare both sides of the breaker and then close the breaker when appropriate. why would you use an external synchronizer like a beckwith m-0193?
Hello,
I am hoping some one has experience with generating plants. I have this old panel doing synchronizing for our breakers. All of our breakers now have C60, and I am planning on transfering the functionality into them, thus abolishing the panel.
My issue comes from the first picture...
While checking a colleague's DC study for batt sizing. We've come to a disagreement.
When it comes to the final duty of the battery – ie: restoration of station service.
Assuming no one can get to the station within the time the batteries run out. so remote restoration.
2 issues:
1) for this...
Hello dear colleges, .
I am trying to achieve differential protection on a transformer using a SEL-387E but the LV CT will have to be shared through the downstream overcurrent protection (SEL-351S) due to lack of CTs.
The star point of the SEL-351S prot, is loooking away from the TX. So, my...
Due to breaker physical dimensions it seems the line PT (phase B - middle) is restricting constructability.
Is there any issues with moving the Line PT to the other phase? say A as far as protections, etc goes?
