MR type R switch 4 resistors. Example Canada 3.4 and 6 Ohms Phase shifting transformer 840 MVA 240kV.

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Presentation transcript:

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 4 th segment influenced

OLTC problem ? 890MVA 500kV/25kV Malaysia

Nameplate 2 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?