GB952248A - Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like - Google Patents

Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like

Info

Publication number
GB952248A
GB952248A GB355062A GB355062A GB952248A GB 952248 A GB952248 A GB 952248A GB 355062 A GB355062 A GB 355062A GB 355062 A GB355062 A GB 355062A GB 952248 A GB952248 A GB 952248A
Authority
GB
United Kingdom
Prior art keywords
supply
coil
motor
contacts
trigger
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
GB355062A
Inventor
Owen Walter Dumpleton
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.)
Babcock International Ltd
Original Assignee
Babcock and Wilcox 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 Babcock and Wilcox Ltd filed Critical Babcock and Wilcox Ltd
Priority to GB355062A priority Critical patent/GB952248A/en
Publication of GB952248A publication Critical patent/GB952248A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02H7/08—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 dynamo-electric motors
    • H02H7/09—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 dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

Landscapes

  • General Induction Heating (AREA)

Abstract

952,248. Control of A.C. motors. BABCOCK & WILCOX Ltd. Jan. 30, 1963 [Jan. 30, 1962], No. 3550/62. Heading H2J. A fluid heater cleaner has a retractable lance driven by an induction motor 1 which is supplied from three phase generator 3 through reversing contacts 2a, 2b. If one phase of the supply is interrupted during forward movement of a lance, it is not possible to reverse the drive unless the star point of the motor is connected to the neutral point of the supply. For this purpose, a filter 12 is associated with current transformer 7 so that the frequency of the signal applied to the filter changes when a fault develops in one of the phases of the supply. A trigger 16 is then operated through amplifier 13 and filter 17, so causing trigger circuit 19 to de-energize relay coil 20. This causes contacts 5b to complete a circuit between the star point of the motor and the neutral point of the supply. Alarm contacts 22 are closed at the same time. Should a break occur in the lead 4a during normal operation, coil 27 is de-energized to close switch 28. The trigger circuit 19 then acts to de-energize the coil 20 and close the alarm contacts 22. Resistor 30 and capacitor 31 provide a delay in the operation of the trigger 19 to prevent a false alarm indication. Transient surges are suppressed by resistor 26 and capacitor 32 associated with coil 27. The motor 1 is one of several adapted for sequential operation. Specification 636,052 is referred to.
GB355062A 1962-01-30 1962-01-30 Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like Expired GB952248A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB355062A GB952248A (en) 1962-01-30 1962-01-30 Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB355062A GB952248A (en) 1962-01-30 1962-01-30 Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like

Publications (1)

Publication Number Publication Date
GB952248A true GB952248A (en) 1964-03-11

Family

ID=9760455

Family Applications (1)

Application Number Title Priority Date Filing Date
GB355062A Expired GB952248A (en) 1962-01-30 1962-01-30 Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like

Country Status (1)

Country Link
GB (1) GB952248A (en)

Similar Documents

Publication Publication Date Title
GB952248A (en) Improvements relating to apparatus of the kind including a retractable lance adapted for insertion into and withdrawal from a furnace chamber gas pass or the like
GB1266659A (en)
GB899369A (en) Automatic viscometer
US3524717A (en) Combustion supervision system
GB1311743A (en) Control circuits
GB1193344A (en) Improvements in or relating to Circuits for Operating D.C. Motors
JPS5490514A (en) Starting-assist circuit for commutatorless motor
ES370944A1 (en) Weld current controller
US2589279A (en) Speed responsive plugging for electric motors
GB1225416A (en)
JPS5429015A (en) Controller for synchronous motor
SU562874A1 (en) Method of switching on a three-phase power transformer of an X-ray diagnostic device
JPS5640038A (en) Detecting device for operation of temperature controller
JPS567583A (en) Remote control system
SU708232A1 (en) Contact-free sensor of mechanism work-performing member position
JPS5614319A (en) Nonelectric arc tap switching control unit
SU446024A1 (en) Device to control the movement of the working units of the machine
GB1532084A (en) Earth leakage circuit breaker
SU143871A1 (en) Differential-phase high-frequency protection of power lines
SU875565A1 (en) Device for regulating dc electric motor rotational speed
GB698595A (en) Device for switching on a transformer for a short time interval
GB1103692A (en) Improvements in or relating to the connection of an a.c. generator to a power supply
GB1101816A (en) Absorption refrigeration systems
JPS51121723A (en) Controlling device of chopper-controlled electric car
GB1176735A (en) Improvements in or relating to Gyrocompasses.