EP0324217A1 - Sicherheitsanlage und Verfahren - Google Patents

Sicherheitsanlage und Verfahren Download PDF

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Publication number
EP0324217A1
EP0324217A1 EP88300275A EP88300275A EP0324217A1 EP 0324217 A1 EP0324217 A1 EP 0324217A1 EP 88300275 A EP88300275 A EP 88300275A EP 88300275 A EP88300275 A EP 88300275A EP 0324217 A1 EP0324217 A1 EP 0324217A1
Authority
EP
European Patent Office
Prior art keywords
conductive member
signal
sensor
electric field
safety system
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.)
Withdrawn
Application number
EP88300275A
Other languages
English (en)
French (fr)
Inventor
Gerald Francis Rome
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.)
Texaco Development Corp
Original Assignee
Texaco Development Corp
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
Priority to US06/451,708 priority Critical patent/US4727447A/en
Application filed by Texaco Development Corp filed Critical Texaco Development Corp
Priority to EP88300275A priority patent/EP0324217A1/de
Publication of EP0324217A1 publication Critical patent/EP0324217A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C15/00—Safety gear
    • B66C15/06—Arrangements or use of warning devices
    • B66C15/065—Arrangements or use of warning devices electrical
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0021—Safety devices, e.g. for preventing small objects from falling into the borehole
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting

Definitions

  • the present invention relates to safety systems and methods and, more particularly, to a safety system and method for use with electrically conductive members when used in the presence of power lines.
  • a safety system and method for use with apparatus having a conductive member where said apparatus changes the attitude and/or altitude of the conductive member during the operation of the apparatus, and includes at least one sensor mounted on the conductive member.
  • the sensor is adapted to sense an electric field and provide a signal representative of the strength of the sensed electric field. Further changing of the attitude and/or altitude of the conductive member is prevented in response to the signal from the sensor when the electric field strength is greater than a predetermined safe value.
  • a conductive member for purposes of the present invention is any member whose structure is conductive or whose structure is non-conductive but has other means of conduction such as wires and cables. The present invention provides a method of preventing this type of accident and at the same time warning the operator that the rig is in a hazardous situation.
  • FIG. 1 there is shown a typical service conductive member such as a derrick 3 mounted on a truck 1 and which is raised to an operating position by conventional means.
  • a typical service conductive member such as a derrick 3 mounted on a truck 1 and which is raised to an operating position by conventional means.
  • sensors 7, 7A, and 7n Located at strategic points on the derrick 3 are one or more sensors represented by sensors 7, 7A, and 7n, which are electrically connected to an electronic system 10.
  • sensors 7, 7A, and 7n Located at strategic points on the derrick 3 are one or more sensors represented by sensors 7, 7A, and 7n, which are electrically connected to an electronic system 10.
  • sensors 7, 7A, and 7n Located at strategic points on the derrick 3 are one or more sensors represented by sensors 7, 7A, and 7n, which are electrically connected to an electronic system 10.
  • sensors 7, 7A, and 7n Located at strategic points on the derrick 3 are one or more sensors represented by sensors 7, 7A, and 7n, which are electrically connected to an electronic
  • sensors 7 to 7n in the presence of an electric field each provide a signal to a multiplexing unit 14 of electronic system 10 which multiplexes the signals at approximately 1 second samples.
  • the multiplexed signal is then provided to a narrow band filter and amplifier 17 which filters the multiplexed signal so that only a signal having a frequency substantially corresponding to a frequency of the power on the power line is provided to a maximum signal level circuit 23.
  • Circuit 23 is of a conventional type and its detail is not necessary to an understanding of the present invention.
  • Maximum signal level circuit 23 may be overridden by an override signal from an override signal means 25 which may be a simple on/off switch receiving a direct current voltage for application to the maximum signal sensing circuit 23.
  • a sensitivity control signal means 28 provides a signal to maximum signal level circuit 23 for adjusting the sensitivity of maximum signal level circuit 23.
  • Maximum signal level sensing circuit 23 provides a brake signal to actuator means 32, which is part of the conventional raising means, and which also receives a hoist enable signal from hoist enable signal means 37 when derrick 3 is being raised.
  • the brake signal from actuator means 32 is provided to brake actuator means 44 and to alarm means 48.
  • Alarm means 48 may provide either an audio alarm, a visual alarm or both.
  • an operator wishing to raise the derrick 3 causes the hoist enable signal means 37 to provide a hoist enable signal to actuator means 32 which raises derrick 3.
  • the electric field around that power line causes sensors 7 to 7n to provide signals to multi­plexing unit 14 having amplitudes corresponding to the intensity of the electric field.
  • Multiplexing unit 14 provides a multiplexed signal to narrow band filter and amplifier 17 which in turn provides the filtered signal to maximum signal level circuit 23. Any one of the sensors 7 to 7n providing a signal that is greater than a predetermined safety level causes maximum signal level circuit 23 to provide a signal to actuator means 32 disabling actuator means 32 and causing actuator means 32 to provide the brake signal to brake actuator means 44 and alarm means 48.
  • Brake actuator means 44 stops the movement of derrick 3, while alarm means 48 sounds an alarm that derrick 3 has approached a power line. Should any one of the sensors 7 to 7n provide such a signal and the operator in his judgment can see that he can safely raise derrick 3 in the presence of the power line, he may then utilize override control means 25 to provide an override signal to maximum signal level sensing circuit 23 which then is deactivated to allow actuator means 32 to continue to raise derrick 3. The operator would also use the override signal when lowering derrick 3 after the derrick has entered a strong electric field.
  • Figure 3A, 3B, 3C and 3D show different types of configurations for sensors 7, although the specific configuration of sensor 7 is not restricted to any one of four types shown, but must be a sensor which will produce a signal in the presence of an electric field that is representative of the strength of the electric field.
  • the present invention as hereinbefore described is a safety system for use with a truck which utilizes a derrick or a conductive structure which is raised from one position to another position during the course of operation and which may come into contact with electric power lines and cause injury or death to the operators of such apparatus.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Business, Economics & Management (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Management (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
EP88300275A 1982-12-20 1988-01-13 Sicherheitsanlage und Verfahren Withdrawn EP0324217A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/451,708 US4727447A (en) 1982-12-20 1982-12-20 Safety system and method
EP88300275A EP0324217A1 (de) 1988-01-13 1988-01-13 Sicherheitsanlage und Verfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88300275A EP0324217A1 (de) 1988-01-13 1988-01-13 Sicherheitsanlage und Verfahren

Publications (1)

Publication Number Publication Date
EP0324217A1 true EP0324217A1 (de) 1989-07-19

Family

ID=8199921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88300275A Withdrawn EP0324217A1 (de) 1982-12-20 1988-01-13 Sicherheitsanlage und Verfahren

Country Status (1)

Country Link
EP (1) EP0324217A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999035507A1 (en) * 1997-12-22 1999-07-15 Ep International Ab A method and device to capture and process electric signals

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064997A (en) * 1976-03-29 1977-12-27 Eugene Richard Holland Crane swing safety control
EP0134943A1 (de) * 1983-07-25 1985-03-27 Hydro-Quebec System und Verfahren zur Ansage der Annäherung an Starkstromleitungen
US4649375A (en) * 1985-10-31 1987-03-10 Fmc Corporation Apparatus for detecting power lines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064997A (en) * 1976-03-29 1977-12-27 Eugene Richard Holland Crane swing safety control
EP0134943A1 (de) * 1983-07-25 1985-03-27 Hydro-Quebec System und Verfahren zur Ansage der Annäherung an Starkstromleitungen
US4649375A (en) * 1985-10-31 1987-03-10 Fmc Corporation Apparatus for detecting power lines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999035507A1 (en) * 1997-12-22 1999-07-15 Ep International Ab A method and device to capture and process electric signals

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