Mr type r switch
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MR type R switch PowerPoint PPT Presentation


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MR type R switch. 4 resistors. Example Canada 3.4 and 6 Ohms. Phase shifting transformer 840 MVA 240kV. MCa - Main contact (copper) opening. First region. MSCa - Main switching contact opens. Adding resistance – current drops. Second region – subtracting turns.

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MR type R switch

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MR type R switch

4 resistors


Example Canada 3.4 and 6 Ohms

Phase shifting transformer 840 MVA 240kV


MCa - Main contact (copper) opening


First region

MSCa - Main switching contact opens


Adding resistance – current drops


Second region – subtracting turns

TCa2 - Transition contact closes

Connecting onto the contact at “potential” and lower resistance


UP


Second region – adding turns

Connecting onto the contact with potential at lower resistance


DOWN


Third region


Fourth


Fifth


Recovery


Main contact = b


Influence of L

More or less turns

Phase shifter


More turns


Less turns

4th segment influenced


OLTC problem ?

890MVA 500kV/25kV

Malaysia


Nameplate2 type R OLTCs in parallel


Type R – two resistors sequence


Nameplate

Double tap changer

windings in parallel

Y connected

Fine-coarse regulation


Double time on ODD transitions

Transition 100mSec


Good time on EVEN transitions

Transition 40mSec


Complete test – up and down


Is it because two parallel windings and two parallel OLTCS tested at the same time?


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