A DRIVE CIRCUIT FOR THE TRIP ACTUATOR OF A NETWORK PROTECTORAND A NETWORK PROTECTOR INCORPORATING THE SAME

A network protector includes a coil drive circuit for the trip actuator which operates as a current limiter to protect a trip coil with limited impedance at the upper limit of network voltage while assuring operation at network voltages of less than 10% rated voltage. A comparator provides gate driv...

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Bibliographic Details
Main Authors JOHNSON, RICHARD ARTHUR, MEINERS, STEVEN EDWARD
Format Patent
LanguageEnglish
French
Published 05.03.2002
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
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Summary:A network protector includes a coil drive circuit for the trip actuator which operates as a current limiter to protect a trip coil with limited impedance at the upper limit of network voltage while assuring operation at network voltages of less than 10% rated voltage. A comparator provides gate drive current to a FET connected in series with the trip coil as long as coil current is below a reference voltage proportional to a specified maximum value of coil current. When the specifie d value of coil current is reached, the FET is latched off until the network protect or is tripped open again.
Bibliography:Application Number: CA20012357099