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

MR type R switch

4 resistors


Example canada 3 4 and 6 ohms

Example Canada 3.4 and 6 Ohms

Phase shifting transformer 840 MVA 240kV


Mca main contact copper opening

MCa - Main contact (copper) opening


First region

First region

MSCa - Main switching contact opens


Mr type r switch

Adding resistance – current drops


Second region subtracting turns

Second region – subtracting turns

TCa2 - Transition contact closes

Connecting onto the contact at “potential” and lower resistance


Mr type r switch

UP


Second region adding turns

Second region – adding turns

Connecting onto the contact with potential at lower resistance


Mr type r switch

DOWN


Third region

Third region


Fourth

Fourth


Fifth

Fifth


Recovery

Recovery


Main contact b

Main contact = b


Influence of l

Influence of L

More or less turns

Phase shifter


More turns

More turns


Less turns

Less turns

4th segment influenced


Oltc problem

OLTC problem ?

890MVA 500kV/25kV

Malaysia


Nameplate 2 type r oltcs in parallel

Nameplate2 type R OLTCs in parallel


Type r two resistors sequence

Type R – two resistors sequence


Nameplate

Nameplate

Double tap changer

windings in parallel

Y connected

Fine-coarse regulation


Double time on odd transitions

Double time on ODD transitions

Transition 100mSec


Good time on even transitions

Good time on EVEN transitions

Transition 40mSec


Complete test up and down

Complete test – up and down


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

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


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