Disconnect switch rated 1000V
Disconnect switch rated 1000V
(OP)
Hi. I am new to Electrical Design (in fact this is the first project). My load is rated 1000V /800A . The main disconnecting means is a vacuum contactor 4KV ( overkill I know but not my decision). My manager asked for disconnecting switch and I have hard time to find something at 1000V ( everything available stops at 690V and after that it jumps to MV). Does anybody have a suggestion for this? Thank you in advance
RE: Disconnect switch rated 1000V
1000V is an odd voltage. What load equipment is rated at 1000V? What is the operating voltage?
RE: Disconnect switch rated 1000V
"....#1. My load is rated 1000V/800A . #2. The main disconnecting means is a vacuum contactor 4KV ( overkill I know but not my decision). #3. My manager asked for disconnecting switch and I have hard time to find something at 1000V ( everything available stops at 690V and after that it jumps to MV)....."
1. What system are you working on rated at 1000V, which is a non-standard voltage? A very bad selection. That is way you are having difficulties to source for the right LV equipment, otherwise would go into the MV voltage gears, which are very much more expensive.
2. Attention: The main disconnecting means is a vacuum contactor 4KV .... is NOT allowed to be used as an disconnector!
3. In Europe, there are numerous ACB manufacturers that include 1000V/800A AC Breaker and Disconnector in their standard production program. These products rated at 1000V ac are very much lower cost than a MV gear.
4. Note: These Breakers open clearance would fulfill the Disconnector requirements/standards.
Che Kuan Yau (Singapore)
RE: Disconnect switch rated 1000V
At around 1000 volts there are new kinds of considerations for the design of electrical equipment. For example, at 600 volts a power cable consists of just a conductor surrounded by insulation. Above 1000 volts, there is an additional grounded shield on the outside of the cable. The grounded shield prevents capacitive coupling to adjacent objects and it prevents concentrations of electrical stress that can lead to partial discharge damage.
Using 1000 volts seems like the worst of having to design with partial discharge in mind, but still needing almost as much conductor cross section as at lower voltages.
RE: Disconnect switch rated 1000V
"....#1. Where is your project located? This forum has folks from all over the world. #2. At around 1000 volts there are new kinds of considerations for the design of electrical equipment. For example, at 600 volts a power cable consists of just a conductor surrounded by insulation. Above 1000 volts, there is an additional..."
1. In Europe where IEC is the norm, LV covers up to 1000V ac and 1500V dc. All equipments up to 1000V ac and 1500V dc are considered as LV; covered by the same standard (e.g. IEC 60947-x ...) for breakers, contactors, disconnectors etc...
1.1 Note: In most cases a 1000V ac Breaker /disconnector is actually the same 690V ac breaker/disconnector but labelled with lower Icu , ics, Icw etc.... Therefore physically interchangeable. Attention: But with lower ratings.
2. IEC 60947-x covers up to 1000V ac and 1500V dc. Therefore, Breakers, Disconnectors, Contactors etc... are covered by this single IEC standard.
Che Kuan Yau (Singapore)
RE: Disconnect switch rated 1000V
RE: Disconnect switch rated 1000V
RE: Disconnect switch rated 1000V
RE: Disconnect switch rated 1000V
1000VDC is a more common occurrence in Solar PV systems now, so there are products available for that, but you have to be looking in the right places. Socomec as previously mentioned is one that I believe has 1000VDC solar PV disconnects, ABB is likely another. In those cases you can attain 1000VDC ratings using 4 pole circuit breakers or disconnects by looping two sets of contacts in series for each DC pole. I’ve done this with ABB breakers (10+ years ago so I don’t know if they still offer that) before finding out that Socomec had them available as disconnects for a lot less.
https://www.socomec.com/range-load-break-switches-...
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