Claims
- 1. A method of testing a spring powered switch operated by an operating mechanism having a plurality of driven parts actuated by release of a charged spring, said method comprising the steps of:selecting one of said driven parts having a variable angular position; releasing said charged spring to actuate said driven parts and produce angular movement of said selected one of said driven parts; energizing a rotary potentiometer; tracking angular movement of said selected one of said driven parts with said rotary potentiometer to produce a variable output signal therefrom which corresponds to said angular movement; and monitoring said output signal with respect to time in order to monitor said angular movement of said selected one of said driven parts with respect to time.
- 2. The method of claim 1 including:employing said output signal with respect to time to determine a plurality of angular positions of said selected one of said driven parts; determining operation data for said operating mechanism from said angular positions of said selected one of said driven parts; and outputting said operation data.
- 3. The method of claim 1 including:energizing said rotary potentiometer with a voltage to produce a variable output voltage as the output signal; employing an analog to digital converter to convert the output voltage to a plurality of digital values with respect to time; and employing a microprocessor to monitor said digital values with respect to time.
- 4. The method of claim 3 including:storing said digital values with respect to time; and determining said angular movement of said selected one of said driven parts with respect to time from said stored digital values.
- 5. The method of claim 1 including:energizing said rotary potentiometer with a voltage to produce a variable output voltage as the output signal; and employing an oscilloscope to monitor the output voltage with respect to time.
- 6. The method of claim 5 including:displaying the output voltage with respect to time.
- 7. The method of claim 1 including:rotatably supporting a rotary member in rotational contact with said selected one of said driven parts to produce angular movement thereof which corresponds to said angular movement of said selected one of said driven parts; and adjusting said potentiometer with said rotary member.
- 8. The method of claim 1 including:determining at least one of open position, closed position, action time, action velocity, and action acceleration of the operating mechanism from said motion with respect to time of said selected one of said driven parts.
- 9. The method of claim 1 including:employing a spring crank as said selected one of said driven parts; and monitoring motion with respect to time of the spring crank to determine the speed of discharge of the charged spring.
- 10. The method of claim 9 including:operating separable contacts with said operating mechanism; and evaluating motion with respect to time of the separable contacts from said motion with respect to time of said spring crank.
- 11. The method of claim 9 including:operating separable contacts with said operating mechanism; and determining open and closed positions of the separable contacts from said motion with respect to time of said spring crank.
- 12. The method of claim 1 including:employing a closing cam as said selected one of said driven parts; and monitoring motion with respect to time of the closing cam to determine the speed of discharge of the charged spring.
- 13. The method of claim 1 including:employing an eccentric surface on said selected one of said driven parts; following the eccentric surface with a wheel; employing said wheel to monitor angular movement of said selected one of said driven parts; and adjusting said potentiometer with said wheel.
- 14. An apparatus for testing a spring powered switch operated by an operating mechanism including a driven part having a variable angular position and actuated by release of a charged spring, said apparatus comprising:a potentiometer having an input and a rotary shaft; means for energizing the input of said potentiometer; means for engaging said driven part to adjust the rotary shaft of said potentiometer and produce a variable output signal thereof, said output signal corresponding to said variable angular movement of said driven part; and means for monitoring said output signal with respect to time in order to monitor said angular movement of said driven part with respect to time.
- 15. The apparatus of claim 14 wherein said means for monitoring said output signal includes:means for energizing said potentiometer with a voltage to produce a variable output voltage as the output signal; analog to digital converter means for converting said output voltage to a plurality of digital values with respect to time; and processor means for monitoring said digital values with respect to time.
- 16. The apparatus of claim 15 wherein said processor means includes:means for storing said digital values with respect to time; and means for determining said angular movement of said driven part with respect to time from said stored digital values.
- 17. The apparatus of claim 14 wherein said means for monitoring said output signal includes:oscilloscope means for monitoring said output signal with respect to time.
- 18. The apparatus of claim 17 wherein said oscilloscope means includes:means for outputting said output signal with respect to time.
- 19. The apparatus of claim 14 wherein said spring powered switch includes a support member adjacent said driven part; wherein said driven part is a spring crank; and wherein said means for engaging said driven part includes:a wheel having an axle, said wheel being in rotational contact with said spring crank, with the axle of the wheel rotating in response to said variable angular position of said spring crank; and means for rotatably supporting said wheel with respect to said support member.
- 20. The apparatus of claim 14 wherein said spring powered switch includes a support member adjacent said driven part; wherein said driven part is a closing cam; and wherein said means for engaging said driven part includes:a wheel having an axle, said wheel being in rotational contact with said closing cam, with the axle of the wheel rotating in response to said variable angular position of said closing cam; and means for rotatably supporting said wheel with respect to said support member.
- 21. The apparatus of claim 14 wherein said spring powered switch includes a support member adjacent said driven part; wherein said driven part has an eccentric surface; and wherein said means for engaging said driven part includes:a wheel having an axle, said wheel being in rotational contact with the eccentric surface of said driven part; and means for rotatably supporting said wheel with respect to said support member and for following the eccentric surface with said wheel, with the axle of said wheel rotating in response to said variable angular position of said driven part.
- 22. A spring powered switch comprising:separable contacts having an open position and a closed position; means for operating said separable contacts between the open and closed positions, said means for operating including a driven part having a plurality of variable angular positions and a closing spring for actuating said means for operating to move said driven part between said angular positions; and a test assembly comprising: a potentiometer having an input and a rotary shaft; a voltage source connected to the input of said potentiometer; means for engaging said driven part, said means for engaging having a linkage which rotates in response to said angular positions of said driven part, said linkage engaging the rotary shaft of said potentiometer to adjust said potentiometer and produce a variable output voltage, said output voltage corresponding to said angular movement of said driven part; and means for monitoring said output voltage with respect to time in order to monitor said angular movement of said driven part with respect to time.
- 23. The spring powered switch of claim 22 wherein said driven part has an eccentric surface; and wherein said means for engaging said driven part includes means for following the eccentric surface.
CROSS REFERENCE TO RELATED APPLICATION
This application is related to commonly assigned, copending application Ser. No. 09/267,525, filed Mar. 12, 1999, entitled “Method and Apparatus for Testing Spring Powered Switches” by Benke et al.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3183599 |
Byrd et al. |
May 1965 |
A |
5671161 |
Bennet et al. |
Sep 1997 |
A |
5726367 |
Patel et al. |
Mar 1998 |
A |
Non-Patent Literature Citations (2)
Entry |
Berger et al., “Maintenance-Free Vacuum Circuit-Breaker”, The Reliability of Transmission and Distribution Equipment, IEEE Conference Publication No. 406, 6 pp., Mar. 29-31, 1995. |
N. Anger et al., “Diagnostics/Monitoring for Medium-Voltage Components and Systems”, pp. 1.14.1-1.14.4, No Date. |