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Results tagged with high-voltage
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user 28570
Questions related to the design of circuits that supply or use a high voltage. There are a few definitions but the IEC definition of a high-voltage supply system is above 1000 Vrms AC or 1500 V DC.
1
vote
Accepted
What is the most common type of high voltage cables?
A bit late, but;
As far as overhead (aerial) conductors go - who knows?
There are copper conductors (hard-drawn bare copper conductor, HDBCC), various kinds of aluminium alloy of which AAAC 1120 is …
- 9,061
75
votes
Why are consumers located near high-voltage lines typically not connected to those lines but...
HV (66kV - 500kV) is... difficult to deal with.
I will rattle off reasons I can think of from the top of my head.
All figures that follow (weights, dollars) are order-of-magnitude guesstimates.
Cle …
- 9,061
1
vote
What types of bus couplers exist?
A bus coupler is just a normal circuit breaker (and isolators), no matter where it's installed, or which busses it's connecting.
A "cross bus coupler" is just a bus coupler that happens to be connect …
- 9,061
1
vote
Switchgear vs. power distribution center (PDC) vs. motor control center (MCC) - what's the d...
I haven't heard of a "PDC" in my part of the world.
In my experience, "switchboard" refers to a board which contains circuit breakers only, with no motor contactors.
"MCC" - motor control centre - r …
- 9,061
7
votes
Accepted
The life of a high voltage line
Some of the maintenance tasks we do on transmission lines (Rural Australia; 11 kV - 132 kV)
Grade the access roads along the line corridor - access roads tend to get overgrown / washed out over time …
- 9,061
8
votes
Accepted
What is the purpose of the cylindrical layered conical discs in power stations?
These 'stacked cyclindrical discs' are all INSULATORS, which are used to provide adequate CLEARANCE and CREEPAGE DISTANCE between high-voltage parts and earth.
CLEARANCE is the shortest distance in …
- 9,061
9
votes
Accepted
Difference between disconnector, circuit breaker and load break switch?
The main types of switch are:
Isolator / disconnector. Only suitable for opening at no-load. If you open the switch on load, you'll draw an arc. Cheap.
Load-break switch. Can be opened and closed un …
- 9,061
1
vote
What is the "screen of the cable" for medium/high voltage cables?
To supplement Majenko's answer:
This is a labelled diagram of all the layers in a three-core, steel wire armoured cable. The diagram is from Olex Australia's HV catalogue.
- 9,061
2
votes
What kind of cable can be used to power a mobile electric machine running of 6 kV AC?
You would want a "trailing cable" such as those used by the mining industry.
In Australia, Olex is a manufacturer of such cables. See the Olex mining catalogue.
Special features of such cables inclu …
- 9,061
1
vote
Busbar short circuit rating vs. cubicle rating
Ah, ABB Unigear ZS1! I'd recognise it anywhere. :)
I strongly suspect that the 8 kA / 2 sec rating relates to the black insulated fly leads which connect to the voltage transformers.
The cable conn …
- 9,061
5
votes
How do transposition towers in transmission lines work?
From B.M. Weedy's Electric Power Systems 3e (emphasis mine):
Unsymmetrical conductor spacing results in different inductances for each phase which causes an unbalanced voltage drop, even when the …
- 9,061
3
votes
What is the name of this HV test measuring setup?
That looks like impulse test equipment. (There are a few hints: the impulse waveshape on the screen, the faraday caged windows, and the voltage divider (donut-shaped) in the back.)
This equipment is u …
- 9,061
15
votes
How is transition from three-phase distribution without neutral to three-phase consumption w...
A typical distribution network in Australia will look something like the below.
The "MV" section is a delta-connected "three-wire" system, so you are correct in asserting that there is no neutral w …
- 9,061