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#123898 - 06/06/06 12:43 AM NZ HV Tap-Changer Unit  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Thanks to RODALCO for these pics and information:

Quote
The TCOL tapchanger (or Tap Changer On Load) is commonly used in the local POCO 33/ 66 kV substations for voltage regulation for the feeders which supply the end consumers.
In NZ it's mostly 11 or 22 kV feeders, in other countries similar systems will be used.


Atkinson sub. T2 TCOL box open, above small grey box is blank cap for manual crank handle on left.The actual load bearing contacts and resistors are in the grey tank underneath the header tank. The vertical shaft is the drive to the latter. This one is an ASEA 10000 kVA transformer:

[Linked Image]


Master / Follower control contacts drum. close up. Our POCO subs have 17 Tap positions:

[Linked Image]

TCOL of Ferranti 12.5 MVA transformer, the control contact drums are fully submerged in oil:

[Linked Image]

It's about 3 metres from crank to 33 kV bus:

[Linked Image]

Crank key hole:

[Linked Image]

Tapping voltages:

[Linked Image]

Transformer nameplate data:

[Linked Image]


Tools for Electricians:

#123899 - 06/07/06 08:55 PM Re: NZ HV Tap-Changer Unit  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Ray,
Any chance of getting a pic each of the circuit diagram of the transformer and the Tap Changer?.
Just for interests sake. [Linked Image]



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