US3045168A - Electrical circuit for indicating the failure of diodes - Google Patents

Electrical circuit for indicating the failure of diodes Download PDF

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Publication number
US3045168A
US3045168A US842487A US84248759A US3045168A US 3045168 A US3045168 A US 3045168A US 842487 A US842487 A US 842487A US 84248759 A US84248759 A US 84248759A US 3045168 A US3045168 A US 3045168A
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Prior art keywords
diodes
trigger
fuses
failure
circuit
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Expired - Lifetime
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US842487A
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English (en)
Inventor
Frederick G Fellendorf
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Priority to US842487A priority Critical patent/US3045168A/en
Priority to JP4772260U priority patent/JPS3714937Y1/ja
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1203—Circuits independent of the type of conversion
    • H02H7/1206—Circuits independent of the type of conversion specially adapted to conversion cells composed of a plurality of parallel or serial connected elements

Definitions

  • This invention relates to circuits for indicating the failures of diodes in rectifier circuits.
  • This invention places such indicator lamps in circuits where they are not affected by variations in the rectifier output voltage.
  • An object of this invention is to improve circuits for indicating the failures of diodes in rectifier circuits.
  • Another object of this invention is to supply constant voltage to a local indicator lamp when a diode in a rectifier circuit fails.
  • FIG. 1 is a simplified circuit schematic of one embodiment of this invention.
  • FIG. 2 is a simplified circuit schematic of another embodiment of this invention.
  • A.C. supply lines L1 and L2 which may be one phase of a multi-phase supply, are connected to switches S1 and S2 respectively, of circuit breaker CB.
  • the line L1 is connected through the switch S1, a main fuse F1 shunted by a conventional trigger fuse TF 1, and series-connected diodes D1, D2 and D3 to a positive DC. output bus 10.
  • Bus 11 connected to the switch S2 is the negative output bus.
  • the trigger fuse TF1 is insulatedly connected to a switch S3 which is normally spaced from a contact 12, and is biased towards the contact 12 by a spring 13.
  • the contact 12 is connected to one supply bus 15 of an auxiliary, constant voltage, supply source 16.
  • the switch S3 is connected in series with a local indicator lamp L1, shunted by resistor R1, and a resistor R2 to a bus 17.
  • the line 111 is also connected through the switch S1,
  • the trigger fuse TF2 is insulatedly connected to a switch S6 which is normally spaced from a contact 30, and is biased by a spring 31 towards the contact 30.
  • the contact 30 is connected to the bus 15, and the switch S6 is connected in series withanother local indicator lamp L3, shunted by resistor R6, and resistor R7 to the bus 17.
  • the line L1 is also connected through the switch S1, another main fuse F3 shunted by another conventional trigger fuse TF3, and series-connected diodes D7, D8 and D9 to the output bus 10.
  • the trigger fuse TF3 is insulatedly connected to aswitch S7 which is normally spaced from a contact 32, and is biased by a spring 33 towards the contact 32.
  • the contact 32 is connected to the bus 15, and the switch S7 is connected in series with another local indicator lamp L4, shunted by resistor R8, and resistor R9 to the bus 17.
  • a control relay coil CR1 is connected to the busses 17 and 18.
  • Another control relay coil CR2 is connected in series with a resistor R3 to the busses 17 and 18. Current for lighting the local indicator lamps from the source 16 flows through the two relay coils.
  • the relay coil CR1 has a switch S4 which normally is spaced from contacts 25 and 26 which are connected in series with a remote indicator lamp L2 across the supply busses 15 and 18 when the switch S4 touches the contacts 25 and 26.
  • the relay coil CR2 has a switch S5 which normally is spaced from contacts 27 and 28 which are connected in series with the circuit breaker coil CB across the supply busses 15 and 18 when the switch S5 touches the contacts 27 and 28.
  • the local lamps L1, L3 and L4 indicate which of the three strings of diodes has failed.
  • the remote lamp L2 indicates when any one string of diodes has failed.
  • the operation of the circuit breaker indicates that a second string of diodes has failed, by deenergizing the rectifier system.
  • the circuit breaker coil CB could be replaced by another remote indicator lamp to indicate that two strings of diodes have failed. Such additional lamp if used, and the remote lamp L2 could be replaced by sections of an annunciator.
  • Each string of series-connected diodes could be replaced by a single diode, in which case, the lamps L1, L3 and L4 would indicate which diode has failed.
  • FIG. 2 is an embodiment of this invention similar to FIG. 1 except that the two control relays CR1 and CR2 of FIG. 1 are replaced by remote indicator lamps.
  • the lamp L2 which indicates when a first string of diodes has failed, is connected as is the relay coil CR1 in FIG. 1, to the busses 17 and 18.
  • the remainder of the components of FIG. 2 are identical with those given the same reference characters in FIG. 1, and operate in the same manner as in FIG. 1.
  • the lamps L2 and L5 of PEG. 2 could be replaced by two sections of an annunciator.
  • the resistor R5 should be considered a part of the relay CR2 for the winding of the relay could be made to include the resistance of the resistor.
  • the resistor R12 should be considered a part of the lamp L5 for the filament of this lamp could be made to include the resistance of the resistor R12.
  • the relays CR1 and CR2 are to be considered as connected in parallel even though there is a resistor R5 in series with the relay CR2.
  • the lamps L2 and L5 of FIG. 2 should be considered as connected in parallel even though there is a resistor R12 in series with the lamp L5.
  • a failure indicating circuit for a plurality of diodes connected in parallel circuit relationship between a supply bus and a load bus comprising main fuses in series with said diodes, trigger fuses shunting said main fuses, said trigger fuses having switches which close when said trigger fuses blow, an auxiliary voltage source, a local failure indicator for each of said trigger fuses, a first remote failure indicator, a second remote failure indicator, means connecting said first and second indicators in parallel circuit relationship to said auxiliary voltage source, said second indicator requiring more current flow through it to operate it than said first indicator requires to operate, and means including each of said switches and said parallel-connected indicators for connecting a corresponding one of said local failure indicators to said auxiliary voltage source when a corresponding one of said trigger fuses blow.
  • a failure indicating circuit for a plurality of diodes connected in parallel circuit relationship between a supply bus and a load bus, said circuit comprising main fuses, trigger fuses shunting said main fuses, said trigger fuses having switches which close when said trigger fuses blow, an auxiliary voltage source, a local failure indicator lamp for each of said trigger fuses, a first control relay, a second control relay, means connecting said relays in parallel circuit relationship to said auxiliary voltage source, said second relay requiring a greater current to operate it than said first relay requires to operate, means including each of said switches and said parallel-connected relays for connecting a corresponding one of said lamps to said source when a corresponding one of said trigger fuses blow, means operated by said first relay when a first one of said trigger fuses blow for indicating that a first trigger fuse has blown, and means operated by said second relay when a second one of said trigger fuses blow for indicating that a second trigger fuse has blown.
  • a failure indicating circuit for a plurality of diodes connected in parallel circuit relationship between a supply ous and a load bus, said circuit comprising a circuit breaker and main fuses in series with said diodes, trigger fuses shunting said main fuses, said trigger fuses having switches which close when said trigger fuses blow, said circuit breaker having an operating coil, an auxiliary voltage source, a local failure indicator lamp for each of said trigger fuses, parallel-connected first and second control relays, said second relay requiring a greater current flow through it to energize it than said first relay requires to operate, means including each of said switches and said parallel-connected relays for connecting a corresponding one of said lamps to said auxiliary voltage source when a corresponding one of said trigger fuses blow, a remote failure indicator, means including a switch of said first relay for connecting said indicator to said auxiliary voltage source when said first relay is energized, and means including a switch of said second relay for connecting said operating coil of said circuit breaker to said source for energizing said coil to open said circuit
  • a failure indicating circuit for a diode connected between a supply bus and a load bus comprising a main fuse connected in series with said diode; a trigger fuse shunting said main fuse, a first pair of switch contacts which are closed when said trigger fuse blows; an auxiliary power source; a relay having a coil and a contact closing member; a local failure indicator for said trigger fuse; said first pair of switch contacts connecting said local failure indicator, said relay coil, and said auxiliary power source in series circuit relation ship upon the blowing of said trigger fuse; a second circuit comprising said auxiliary power source; a second pair of switch contacts and a remote indicator; said second pair of contacts being closed by the contact closing member of said relay upon the failure of said trigger fuse to energize said remote indicator.
  • a failure indicating circuit for a diode connected between a supply bus and a load bus comprising a main fuse connected in series with said diode; a trigger fuse shunting said main fuse; a first pair of switch contacts which are closed when said trigger fuse blows; an auxiliary power source; a relay having a coil and a contact closing member; said first pair of switch contacts connecting said relay coil, and said auxiliary power source in series circuit relationship upon the blowing of said trigger fuse; a second circuit comprising said auxiliary power source, a second pair of switch contacts and an indicator; said second pair of contacts being closed by the contact closing member of said relay upon the failure of said trigger fuse to energize said indicator.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Power Conversion In General (AREA)
US842487A 1959-09-25 1959-09-25 Electrical circuit for indicating the failure of diodes Expired - Lifetime US3045168A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US842487A US3045168A (en) 1959-09-25 1959-09-25 Electrical circuit for indicating the failure of diodes
JP4772260U JPS3714937Y1 (enrdf_load_html_response) 1959-09-25 1960-09-24

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US842487A US3045168A (en) 1959-09-25 1959-09-25 Electrical circuit for indicating the failure of diodes

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JP (1) JPS3714937Y1 (enrdf_load_html_response)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147466A (en) * 1960-06-09 1964-09-01 French Oil Mill Machinery Pilot light system
US3165725A (en) * 1960-12-28 1965-01-12 Bell Telephone Labor Inc Protected amplifying device
US3300650A (en) * 1963-04-12 1967-01-24 Automatic Switch Co Power line failure detection system
US3304391A (en) * 1965-09-29 1967-02-14 Fuse Indicator Corp Fuseholder containing pilot light and switch
US3328692A (en) * 1964-05-11 1967-06-27 Int Rectifier Corp Test circuit for rectifier elements having single low-voltage high-current transformer and single high-voltage low-current transformer
US3328693A (en) * 1964-05-13 1967-06-27 Int Rectifier Corp Forward-reverse rectifier test apparatus having auxiliary diode shunted fuse indicator
US3423637A (en) * 1965-06-24 1969-01-21 Int Standard Electric Corp Control of a relay chain circuit
US3512073A (en) * 1968-10-28 1970-05-12 Westinghouse Electric Corp Electrical circuit for indicating the blowing of fuses
US3974436A (en) * 1974-05-22 1976-08-10 Siemens Aktiengesellschaft Circuit arrangement for an electric melting furnace
US4217621A (en) * 1978-09-22 1980-08-12 General Motors Corporation Circuit for detecting diode shorting
US4466528A (en) * 1981-08-13 1984-08-21 Rowe International, Inc. Apparatus for preventing circuit burn-out in multi-price merchandisers
US10190990B2 (en) 2015-03-24 2019-01-29 Uster Technologies, Ag LED-based fiber property measurement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE375099C (de) * 1923-05-05 Siemens Schuckertwerke G M B H Stoerungsmelder, insbesondere fuer Drehstromzaehler, -wattmeter und andere Drehstromapparate
US2930961A (en) * 1957-12-20 1960-03-29 Gen Electric Fuse monitoring circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE375099C (de) * 1923-05-05 Siemens Schuckertwerke G M B H Stoerungsmelder, insbesondere fuer Drehstromzaehler, -wattmeter und andere Drehstromapparate
US2930961A (en) * 1957-12-20 1960-03-29 Gen Electric Fuse monitoring circuit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147466A (en) * 1960-06-09 1964-09-01 French Oil Mill Machinery Pilot light system
US3165725A (en) * 1960-12-28 1965-01-12 Bell Telephone Labor Inc Protected amplifying device
US3300650A (en) * 1963-04-12 1967-01-24 Automatic Switch Co Power line failure detection system
US3328692A (en) * 1964-05-11 1967-06-27 Int Rectifier Corp Test circuit for rectifier elements having single low-voltage high-current transformer and single high-voltage low-current transformer
US3328693A (en) * 1964-05-13 1967-06-27 Int Rectifier Corp Forward-reverse rectifier test apparatus having auxiliary diode shunted fuse indicator
US3423637A (en) * 1965-06-24 1969-01-21 Int Standard Electric Corp Control of a relay chain circuit
US3304391A (en) * 1965-09-29 1967-02-14 Fuse Indicator Corp Fuseholder containing pilot light and switch
US3512073A (en) * 1968-10-28 1970-05-12 Westinghouse Electric Corp Electrical circuit for indicating the blowing of fuses
US3974436A (en) * 1974-05-22 1976-08-10 Siemens Aktiengesellschaft Circuit arrangement for an electric melting furnace
US4217621A (en) * 1978-09-22 1980-08-12 General Motors Corporation Circuit for detecting diode shorting
US4466528A (en) * 1981-08-13 1984-08-21 Rowe International, Inc. Apparatus for preventing circuit burn-out in multi-price merchandisers
US10190990B2 (en) 2015-03-24 2019-01-29 Uster Technologies, Ag LED-based fiber property measurement

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Publication number Publication date
JPS3714937Y1 (enrdf_load_html_response) 1962-06-25

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