
Transient Recovery Voltage
A-18
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Shunt Capacitor
Figure A.18 shows how a shunt capacitor is used to modify the TRV
(Courtesy of ABB Power T&D Company, Inc.).
A shunt capacitor is connected across the phase-to-ground voltage. This
has no effect on the magnitude of the recovery voltage but does affect the
initial rate of rise of the transient voltage.
Figure A.18 Transient Recovery Voltage: Shunt Resistor Operation
Open-Gap Grading
Capacitor
Figure A.19 shows how an open-gap grading capacitor is used to modify
the TRV (courtesy of Mitsubishi Electric).
A capacitor is applied across the open contacts of a circuit breaker. Most
multibreak circuit breakers use grading capacitors across the contacts to
obtain the proper voltage division for interruption and surge voltage
control.
The grading capacitor acts the same as a shunt capacitor in affecting the
initial rate of the transient voltage.
Figure A.19 Transient Recovery Voltage:
Open-Gap Grading Capacitor Operation
C
Z
TRV
Shaping
Capacitor
C
Z
Grading
Capacitor
Содержание TDR9000
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