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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.

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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


Second region adding turns

Second region – adding turns

Connecting onto the contact with potential at lower resistance

Mr type r switch


Third region

Third region







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


Nameplate 2 type r oltcs in parallel

Nameplate2 type R OLTCs in parallel

Type r two resistors sequence

Type R – two resistors sequence



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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