GB969278A - Improvements relating to supervisory/alarm circuits for electrical equipment - Google Patents

Improvements relating to supervisory/alarm circuits for electrical equipment

Info

Publication number
GB969278A
GB969278A GB1871262A GB1871262A GB969278A GB 969278 A GB969278 A GB 969278A GB 1871262 A GB1871262 A GB 1871262A GB 1871262 A GB1871262 A GB 1871262A GB 969278 A GB969278 A GB 969278A
Authority
GB
United Kingdom
Prior art keywords
fuses
circuits
switching contacts
parallel
alarm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1871262A
Inventor
George Edward Smazell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB1871262A priority Critical patent/GB969278A/en
Publication of GB969278A publication Critical patent/GB969278A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/046—Signalling the blowing of a fuse

Landscapes

  • Rectifiers (AREA)

Abstract

969,278. Protective systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. April 9, 1963 [May 15, 1962], No. 18712/62. Heading H2K. In an apparatus, e.g. a rectifier equipment, having a plurality of fuses which may fail independently, the fuses have switching contacts S1 . . . Sn connected in a circuit across which is connected a parallel branch circuit containing means RL for providing an alarm. The failure of one or more fuses and the consequent operation of the associated switching contacts causes the ratio between the resistances of the parallel circuits to vary, the alarm means RL being operated when the ratio reaches a value corresponding to the failure of a predetermined number of fuses. The combined resistance of the parallel circuits also varies so that the total current taken indicates the number of failed fuses. In the arrangement shown the contacts S1 . . . Sn open when the associated fuses fail to remove the short circuits from resistors R2. A milliammeter M may be directly calibrated to indicate the number of failed fuses. Several circuits containing switching contacts may be associated with a common parallel branch circuit, half-wave rectifiers being provided to prevent interaction between the several circuits, Fig. 2 (not shown).
GB1871262A 1962-05-15 1962-05-15 Improvements relating to supervisory/alarm circuits for electrical equipment Expired GB969278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1871262A GB969278A (en) 1962-05-15 1962-05-15 Improvements relating to supervisory/alarm circuits for electrical equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1871262A GB969278A (en) 1962-05-15 1962-05-15 Improvements relating to supervisory/alarm circuits for electrical equipment

Publications (1)

Publication Number Publication Date
GB969278A true GB969278A (en) 1964-09-09

Family

ID=10117124

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1871262A Expired GB969278A (en) 1962-05-15 1962-05-15 Improvements relating to supervisory/alarm circuits for electrical equipment

Country Status (1)

Country Link
GB (1) GB969278A (en)

Similar Documents

Publication Publication Date Title
US3600634A (en) Protective control circuit against transient voltages
US3527985A (en) Electrical barrier device
US2317030A (en) Fuse indicating system
GB963751A (en) Error correction device
US3225257A (en) High speed direct current voltage fault sensing, indicating and load protecting apparatus
US4438299A (en) On-line telephone troubleshooting apparatus
GB1026841A (en) Automatic control switchboard assembly
US3235677A (en) Arrangements for locating faults in communication lines
GB969278A (en) Improvements relating to supervisory/alarm circuits for electrical equipment
IE801432L (en) Monitoring of electronic equipment
GB1524540A (en) Indicator lamp circuit having feedback protection
US3068460A (en) Fault detector and localizer
US3094647A (en) Circuit protection means
GB1308693A (en) Circuit arrangement for indicating the failure of a lamp
GB851445A (en) Improvements in or relating to automatic signalling systems
US3801974A (en) Voltage responsive alarm system for telephone lines
US3440524A (en) Test circuit for determining whether a plurality of electrical switches operate in a prescribed break sequence
US2895099A (en) Voltage balancing for series connected rectifiers
US3441802A (en) Voltage responsive relay type quantizer for monitoring plural sources
US3281833A (en) Fault detection indicator
US3586975A (en) A voltage monitoring circuit for simultaneously detecting excessive excursions of a plurality of primary voltage source
FR2309121A7 (en) DC supply circuits currency interruption alarm system - uses electro-luminescent diodes to control conduction of transistor which causes relay operation
US2742595A (en) Control circuits
US3079532A (en) Protection device for reverse polarity in d.-c. generators
US2851657A (en) Comparison type electrical test set