/PERATING INSTRUCTIONS
6%
6
# ' #
-EASURING THE CLOSING TIME OF THE CIRCUIT BREAKER
)N ORDER TO ACHIEVE EXACT PARALLELING WITH PHASE
ANGLE THE BREAKER OPERATING TIME MUST BE MEAS
URED WHEN CLOSING AND SET CORRECTLY IN ADDRESS
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SEE ALSO 3ECTION 4HE EXPERIMENTAL ARRANGE
MENT VARIES DEPENDING ON THE SWITCH GEAR CONFIGU
RATION BUT SHOULD CORRESPOND TO THE BASIC IDEA THAT
THE STEADY STATE VOLTAGE PRESENT ON A VOLTAGE TRANS
FORMER 5 IS SWITCHED VIA THE CIRCUIT BREAKER TO A
SECOND VOLTAGE TRANSFORMER 5 &IGURE
4HE
VOLTAGE 5 MUST BE ISOLATED FROM THE NETWORK
DURING THE PROCESS
4HE TIME METER MUST BE SET TO THE S RANGE OR TO A
RESOLUTION OF MS
#LOSE THE CIRCUIT BREAKER MANUALLY THE TIME METER IS
STARTED AT THE SAME TIME 4HE VOLTAGE 5 APPEARS
WHEN THE POLES OF THE CIRCUIT BREAKERS ARE CLOSED THE
TIME METER IS THEN STOPPED 4HE TIME INDICATED ON
THE METER IS THE CIRCUIT BREAKER CLOSING TIME
4HE EXPERIMENT MUST BE REPEATED IF THE TIME METER
DOES NOT STOP BECAUSE OF AN UNFAVOURABLE CLOSING
INSTANT
)T IS BEST TO CALCULATE THE MEAN VALUE FROM SEVERAL
TO SUCCESSFUL SWITCHING ATTEMPTS AND TO SET THIS
UNDER ADDRESS
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#" #,/3% 4- SEE ALSO 3EC
TION
'
Õ
3TOP
4IME
METER
3TART
5
5
&IGURE -EASURING THE CIRCUIT BREAKER CLOSING TIME
