Static voltage differential relay for protection of shunt capacitors

• US 3,181,031 A
• Filed: 11/01/1961
• Issued: 04/27/1965
• Est. Priority Date: 11/01/1961
• Status: Expired due to Term

• Current Assignee: Tom Yee Moon
• Original Assignee: Tom Yee Moon
• Inventors: TOM YEE MOON
• Application Number:
  US04/149,473
• Time in Patent Office: 1,273 Days
• US Class Current: 361/17
• CPC Class Codes: H02H 3/36 involving comparison of the voltage or current values at corresponding points of different systems, e.g. of parallel feeder systems

Claims

1. A MULTI-PHASE POWER TRANSMISSION SYSTEM DEFECT INDICATOR CONTROL CIRCUIT, COMPRISING FIRST AND SECOND VOLTAGE DETECTOR CIRCUITS CONNECTED TO FIRST AND SECOND PORTIONS RESPECTIVELY, ON ONE PHASE OF THE POWER SYSTEM HAVING SERIALLY CONNECTED BETWEEN AND AFTER SAID PORTIONS, GROUPS OF CAPACITOR UNITS IN PARALLEL CIRCUITS FOR MAINTAINING A BALANCED REACTIVE LOAD IN SAID TRANSMISSION SYSTEM EACH SAID CONNECTION BETWEEN A VOLTAGE DETECTOR CIRCUIT AND A PORTION OF THE POWER SYSTEM PHASE COMPRISING A VOLTAGE TRANSFER MEANS HAVING ONE END THEREOF JOINED TO THE SAID PORTION CORRESPONSING THERETO, AND AN OPPOSITE END THEREOF JOINED TO AN ELECTRICALLY CONDUCTIVE JUNCTURE COMMON TO BOTH SAID VOLTAGE TRANSFER MEANS, A COMPARER BRIDGE CIRCUIT, CIRCUIT MEANS CONNECTING RESPECTIVE OUTPUT LINES FROM THE FIRST AND SECOND VOLTAGE DETECTOR CIRCUITS TO OPPOSITE INPUT TERMINALS OF SAID COMPARER BRIDGE CIRCUIT,