Trip signal verifying method and apparatus
First Claim
Patent Images
1. A trip unit comprising:
- a sensor for sensing a condition of a circuit providing electricity to a load;
a signal converter for converting signals generated by said sensor into a digital value indicative of said condition;
a microcontroller configured to process said digital value and generating a first signal and a second signal in response to an overcurrent condition; and
a logic device configured to process said first signal and said second signal and generate a trip signal in response to said first signal and said second signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A verifying trip unit includes a microcontroller providing a plurality of input signals to a logic device for controlling a trip unit actuator. The logic device produces an output signal for controlling a trip unit actuator. In response to the plurality of input signals, the logic device provides an output signal indicative of a function performed on the signals for opening the circuit breaker contacts in an overcurrent condition.
-
Citations
20 Claims
-
1. A trip unit comprising:
-
a sensor for sensing a condition of a circuit providing electricity to a load;
asignal converter for converting signals generated by said sensor into a digital value indicative of said condition;
a microcontroller configured to process said digital value and generating a first signal and a second signal in response to an overcurrent condition; and
a logic device configured to process said first signal and said second signal and generate a trip signal in response to said first signal and said second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 20)
-
-
12. A circuit breaker comprising:
-
a set of contacts for making and breaking an electrical connection between an electrical load and an electrical power supply;
a trip unit operably connected to said contacts, said trip unit including a sensor for sensing a condition of a circuit providing electricity to said load;
a signal converter for converting signals generated by said sensor into a digital value indicative of said condition;
a microcontroller for processing said digital value and generating a first signal and a second signal in response to an overcurrent condition; and
a logic device configured to process said first signal and said second signal and generate a trip signal in response to said first signal and said second signal.
-
-
18. A method of minimizing nuisance tripping in a circuit breaker having a trip unit, the method comprising;
-
detecting an overcurrent condition in a circuit providing electricity to a load;
generating a first signal having a first digital value and a second signal having a second digital value in response to said overcurrent condition; and
generating a trip signal in response to a predetermined combination of said first digital value and said second digital value.
-
Specification