EP0077249A1 - Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk - Google Patents

Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk Download PDF

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Publication number
EP0077249A1
EP0077249A1 EP82401798A EP82401798A EP0077249A1 EP 0077249 A1 EP0077249 A1 EP 0077249A1 EP 82401798 A EP82401798 A EP 82401798A EP 82401798 A EP82401798 A EP 82401798A EP 0077249 A1 EP0077249 A1 EP 0077249A1
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EP
European Patent Office
Prior art keywords
counter
stations
station
time
information
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Application number
EP82401798A
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English (en)
French (fr)
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EP0077249B1 (de
Inventor
François Deslignieres
Philippe Nachan
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EUROPEENNE DE TELETRANSMISSION C E T T Cie
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EUROPEENNE DE TELETRANSMISSION C E T T Cie
EUROPEENE DE TELETRANSMISSION C E T T Cie
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Publication of EP0077249A1 publication Critical patent/EP0077249A1/de
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Publication of EP0077249B1 publication Critical patent/EP0077249B1/de
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G7/00—Synchronisation

Definitions

  • the invention relates to operating assistance systems having a centralized management station and more particularly relates to a method and a system for developing and transmitting information making it possible to establish the relative timing of events which have occurred. in different stations managed by the centralized management station.
  • control and / or command stations are dispersed for controlling an entire network.
  • Each of these stations is connected by an information transmission channel to a central station intended for centralized management of the network; the stations have no links with each other but can cover adjacent areas and transmit information linked to the same event or to events related to each other to the management center.
  • the problem which then arises in the management center is to date the events which have occurred in the different stations in relation to each other and in relation to a common time reference. This problem occurs in most industrial installations, for example in fluid transport installations, as well as in surveillance installations.
  • Another solution consists in establishing the chronometry in one place, the central station having the time reference, with repatriation of all the information in this place as soon as it is captured. This can only be achieved by providing a network of transmission lines. transmission connecting each of the stations to the central management station, this additional network having only this function. This solution is expensive.
  • the subject of the invention is a method for preparing and transmitting information for the establishment of a relative timing which does not have the drawbacks mentioned above, and which in particular can be implemented in systems of operating aid already existing without introducing additional transmission lines.
  • the invention also relates to a system intended for the implementation of this method.
  • the invention also relates to the application of this system to the detection and rapid localization of leaks in a fluid transport network.
  • time references are transmitted from the management center to the stations, and the latter date the information captured by transmitting with this information hourly data derived from these time references.
  • each station is capable of decoding, in addition to its own address used for the transmission of orders which are only intended for it, a general address used for the simultaneous transmission of a single general order to all stations.
  • this general order function is used to transmit to all the distant stations an order of synchronization of local time bases, this order constituting the time reference common to all the stations for an interval of time determined by the interval between two successive synchronization orders.
  • the information concerning the events detected in an area covered by a station is transmitted by the normal link between station and management center, but it is transmitted with hourly data supplied by the local time base; thus they can be stored a certain time before their transmission in order not to interrupt a priority procedure in progress.
  • These local time bases are synchronized, as indicated above. This synchronization is carried out by a periodic general order which depends on the desired precision, but this periodicity is not a characteristic of the system and the general order can be delayed with respect to its normal maturity when the management center is being processing another procedure.
  • a local time base with specific structure is provided in each station which includes a clock associated with a double counter, the first reset to zero by the general synchronization order, the second, of capacity greater than the maximum period between two resets to zero by two consecutive general orders, is automatically loaded by the content of the first when it reaches its maximum capacity.
  • the content of this second counter is the first time information which is stored with the information to be transmitted concerning an event.
  • the method according to the invention consists in transmitting, in addition to the first hourly datum, a second datum intended to resolve the ambiguity.
  • the information received is stored with the corresponding received time data and with additional information produced in the management center itself setting the corresponding time unit (between two synchronization orders).
  • the method for preparing and transmitting chronometry information comprises an additional step after each synchronization which consists in preparing and transmitting to the management center additional reporting information to notify it that synchronization has been completed.
  • This information can be transmitted by change of signaling state.
  • the operating assistance system represented in this figure comprises a management center, PC, connected by bilateral transmission lines T 1 , T 2 , T 3 ... to stations S 1 , S 2 , S3. .. dispersed, for the control and command of a network, for example a pipeline.
  • the management center PC and one of the stations SI have been detailed in an exemplary embodiment.
  • Each remote station includes information sensors, c 1 , c 2 , c3 giving network state characteristics.
  • the information is transmitted to a processor p 1 (for active stations) which stores (and possibly processes) the information, and transmits it during an interrogation by the management center to a modulator-demodulator, m 1 .
  • the output of this modulator-demodulator provides the information to be transmitted on the transmission channel T 1 connected to the management center.
  • the PC management center includes a modulator-demodulator M which receives the information transmitted by the remote stations and transmits it after demodulation to a processor P 1 .
  • the processor P l manages the transmission of the data received from the stations which it transmits to a random access memory, MV, or to the associated operating means, ME, while a second processor P 2 manages the means operating from data stored in memory MV and orders, entered by an operator; a printer I, which is an example of an operating aid unit, has been shown in this figure as a peripheral of the processor P 2 .
  • Other processors can also be provided for additional processing, as well as other memories.
  • the station S 1 which is active, includes the processor p 1 , but other stations may be only passive and not include a processor.
  • each station for the preparation and transmission of timing information, each station includes a timing circuit, CH 1 for the station S 1 .
  • the function of this timing circuit is to date the information transmitted by the sensors c 1 , c 2 , c3 ... when it appears, the dated information then being transmitted via the processor p 1 , the modem m, and the line of normal transmission T 1 to the central PC management station.
  • FIG. 2 represents the detailed diagram of an embodiment of this chronometry circuit CH 1 . It includes a clock 10, the output of which is connected to the counting input of the two counters 11 and 12.
  • the clock can be made of a quartz associated with a series of dividers to obtain the desired counting rate.
  • One of the counters, 11, is synchronized by resynchronization ticks transmitted by the central management station PC to all the stations simultaneously, by a general order. In practice, this synchronization consists in zeroing the counter 11. For this, the synchronization order applied to the input E RESET of the chronometry circuit is transmitted via a shaping circuit 13 to the reset input to zero, RESET, of counter 11.
  • This signal is also applied to the control input of a report loop, 22, which performs a change of state of the output S CR for transmission to the central station in order to indicate that the reset has been completed.
  • the second counter 12 counts at the same time as the first but progresses to its maximum counting capacity which is greater than the maximum number of pulses at the frequency of the clock 10 between two successive resets of the counter 11.
  • an impulse is supplied to the output D of this counter and applied to the reading input L of the counter 11.
  • the parallel outputs of this counter 11 are connected to the parallel inputs of the counter 12, this the latter is loaded by the content of the counter 11 at this instant and then continues to count from this new initial value, which is always different from zero.
  • the parallel outputs of the counter 12 give a time reference at any time to a first entry of time data from a memory 14.
  • the chronometry circuit further comprises a rocker, 21, the input of which is connected to the output of the shaping circuit 13, a pulse supplied to this input causing the output of this flip-flop at state 1.
  • This flip-flop has a reset input connected to the output D of the counter 11.
  • the output, SA, of this flip-flop is connected to a second time data input from the memory 14.
  • the sensors c l , c 2 c3 associated with this station supply the signals which they detect to shaping circuits, respectively 15, 16 and 17.
  • the outputs of these circuits are connected to the input of a filtering circuit 18, the output of which is connected to an input for taking account of memory 14, which when it receives a pulse stores the content of counter 12 present at the first time data input and a information bit corresponding to the state of the second time data entry.
  • These data are transmitted to the output of the chronometry circuit for storage, with the corresponding information in the station's processor, then transmission to the management center.
  • the chronometry circuit must not introduce an error greater than 10 ms on the hourly data transmitted. For this, a maximum duration of 10 6 ms or sixteen minutes and forty seconds must be provided between two synchronizations.
  • the counting frequency 100 Hz (period 10 ms)
  • a counter counting capacity equal to 2 16 either 65536 or 655 360 ms, and a general resynchronization every 600,000 ms, or every ten minutes, the desired precision is obtained.
  • the timing circuit further comprises a multiplexer 20 which transfers the contents of the memory in two bytes, the first transmitted on order 0 and the second immediately after on order 01.
  • the state of the ambiguity removal signal SA can be stored in a bit of the byte reserved for entering the event, this entry generally not occupying 8 bits.
  • the transmission of state change information from the sensors of a station is controlled by the management center.
  • the processor of a station p l can store in its processing stack 21 bytes. If it is assumed that the information coming from a sensor occupies three bytes as indicated above, it is possible to acquire the data corresponding to 7 information coming from the sensors between two interrogations of the station by the central station of management.
  • the information from the sensors is read every 20 ms for example and detected by variation of state during two consecutive periods.
  • the minimum interval for detecting information from the same sensor is therefore 40 ms. Consequently, if events occur and are detected by several sensors from the same station in a slot less than 40 ms, they are associated with the same time information. On the other hand, they are associated with the time information corresponding to their arrival if they are offset by more than 40ms.
  • the two-level signal SA gives the information which removes the ambiguity.
  • the content C PC of the modulo counter 10mn (normal value of the counting time in the stations) commands, at the end of each 10mm cycle, the issuance of the order general synchronization and the increase of one unit of the content of this capacity counter 144.
  • the transmission of this general order can be delayed as much as possible until that the counter 11 reaches its maximum capacity. Indeed, it is automatically reset to zero if it reaches this value.
  • the information arriving at the management center is stored there with on the one hand the hourly data transmitted with them, which fix the time in an hourly unit of approximately 10 minutes, and on the other hand the value of the counter the management center setting the corresponding time unit among the 144 units forming 24 hours.
  • the processor P 2 of this same management center can control the printing of the results, that is to say the appearances of the events with the corresponding times, classified in the order of appearance in the different stations, for example for facilitate the recognition of events linked to each other.
  • the invention applies to all telecontrol or remote monitoring installations having a centralized technical management station in which it is necessary to obtain timing information with an accuracy better than the installation cycle time.
  • the system in fact comprises control stations associated with a central operating station to which they are connected by a transmission medium consisting of a telephone channel.
  • a leak appears at a point in the network, a pressure drop occurs which propagates on each side in the pipeline, in the form of a negative pressure wave.
  • These waves arrive in stations with offsets with respect to the time of appearance of the leak as a function of the distance between the point of escape and the stations, and the speed of this wave, (of the order of 900 m / s).
  • This system is very advantageous since it does not require a very precise clock in each station and nevertheless gives good precision.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
EP19820401798 1981-10-09 1982-10-01 Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk Expired EP0077249B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119074A FR2514599B1 (fr) 1981-10-09 1981-10-09 Procede de chronometrie, systeme de gestion centralisee mettant en oeuvre ce procede, et son application a la detection de fuites dans un reseau de transport de fluides
FR8119074 1981-10-09

Publications (2)

Publication Number Publication Date
EP0077249A1 true EP0077249A1 (de) 1983-04-20
EP0077249B1 EP0077249B1 (de) 1986-01-15

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EP19820401798 Expired EP0077249B1 (de) 1981-10-09 1982-10-01 Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk

Country Status (3)

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EP (1) EP0077249B1 (de)
DE (1) DE3268577D1 (de)
FR (1) FR2514599B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807873A1 (de) * 1996-05-16 1997-11-19 Casio Computer Co., Ltd. Verfahren und Vorrichtung zur Angabe des Zeitpunkts, an welchem ein bestimmter Prozess stattfand
EP0816008A1 (de) * 1996-06-03 1998-01-07 Tadahiro Ohmi Vorrichtung zum Rohrschweissnachprüfen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798650A (en) * 1972-10-02 1974-03-19 Bendix Corp Means for synchronizing clocks in a time ordered communications system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798650A (en) * 1972-10-02 1974-03-19 Bendix Corp Means for synchronizing clocks in a time ordered communications system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS, vol. PAS-99, no. 2, mars/avril 1980, pages 540-548, New York (USA); *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807873A1 (de) * 1996-05-16 1997-11-19 Casio Computer Co., Ltd. Verfahren und Vorrichtung zur Angabe des Zeitpunkts, an welchem ein bestimmter Prozess stattfand
US6130860A (en) * 1996-05-16 2000-10-10 Casio Computer Co., Ltd. Devices and methods for specifying a time when a specified process was performed
US6288978B1 (en) 1996-05-16 2001-09-11 Casio Computer Co., Ltd. Devices and methods for specifying a time when a specified process was performed
EP0816008A1 (de) * 1996-06-03 1998-01-07 Tadahiro Ohmi Vorrichtung zum Rohrschweissnachprüfen
KR980003121A (ko) * 1996-06-03 1998-03-30 다다히로 오미 배관 시공 관리 시스템
US5981905A (en) * 1996-06-03 1999-11-09 Tadahiro Ohmi System for supervising piping work
US6018136A (en) * 1996-06-03 2000-01-25 Tadahiro Ohmi System for supervising piping work
EP1170086A1 (de) * 1996-06-03 2002-01-09 Tadahiro Ohmi Vorrichtung zum Rohrschweissnachprüfen

Also Published As

Publication number Publication date
FR2514599B1 (fr) 1987-11-13
FR2514599A1 (fr) 1983-04-15
DE3268577D1 (en) 1986-02-27
EP0077249B1 (de) 1986-01-15

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