Browse Prior Art Database

Power Line Fault Simulator

IP.com Disclosure Number: IPCOM000098606D
Original Publication Date: 1959-Jun-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Moyer, EE: AUTHOR [+2]

Abstract

It is difficult to simulate for test purposes the sudden changes in voltage to which commercial power distribution systems are subject. The problems lie in making the voltage shifts reproducible and minimizing the unrealistic interruption of power to the load.

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Power Line Fault Simulator

It is difficult to simulate for test purposes the sudden changes in voltage to which commercial power distribution systems are subject. The problems lie in making the voltage shifts reproducible and minimizing the unrealistic interruption of power to the load.

Single phase, 60 cycle, alternating current flows from LINE to LOAD through either of the two pairs of thyratrons 13 and 23. Power flow is shown by double lines. Boost transformer 11 merely compensates for losses in the thyratrons 13. Adjustable transformer 21 is used to set the magnitude of the abnormal voltage to be applied.

Switch 3 selects either the normal or abnormal thyratron pairs and controls the firing of the thyratrons through lines 12 or 22. Switch 3 fires the normal thyratrons at load current zeros detected by sensing circuit 5 in the absence of an indication over line 14 that counter 15 has reached a predetermined count. In the absence of load current, as at start up of the simulator, switch 3 fires the normal thyratrons at a voltage zero detected by sensing circuit 1. When counter 15 indicates a predetermined count, switch 3 waits for a load current zero following a

negative instantaneous polarity of load voltage detected by sensing circuit 5 before firing the abnormal thyratrons 23 and shutting off the normal thyratrons
13. The switch 3 transfers the load back to the normal thyratrons 13 after counter 25 and sensing circuit 5 indicate the conditions just described....