EP1036385B1 - Stromschleifensender mit prüfschaltung - Google Patents

Stromschleifensender mit prüfschaltung Download PDF

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Publication number
EP1036385B1
EP1036385B1 EP99929506A EP99929506A EP1036385B1 EP 1036385 B1 EP1036385 B1 EP 1036385B1 EP 99929506 A EP99929506 A EP 99929506A EP 99929506 A EP99929506 A EP 99929506A EP 1036385 B1 EP1036385 B1 EP 1036385B1
Authority
EP
European Patent Office
Prior art keywords
current
sensor
acquisition
superposition
acquisition 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.)
Expired - Lifetime
Application number
EP99929506A
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English (en)
French (fr)
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EP1036385A1 (de
Inventor
Jean-Paul Audren
Jean Marmonier
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.)
Grid Solutions SAS
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Areva T&D SAS
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Publication of EP1036385A1 publication Critical patent/EP1036385A1/de
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

Definitions

  • the invention relates to a current loop of the type 4-20 milliamps or 0-20 milliamps, connecting an analog sensor to an acquisition system respectively traversed by a sensor current and an acquisition current.
  • Such a current loop is widely used.
  • the advantages of the current loop are well known: on the one hand, the power supply of the sensor is carried by the same wires as the signal, which leads to a reduction in the cost on the part of the wiring compared to other types signals requiring more wires in the cable, on the other hand the signal is very little disturbed by electromagnetic radiation, which allows transmission over long distances or in a medium with a high density of radiation.
  • the document EP 0 422 663 describes a communicator for field instruments that can be used continuously for extended periods of time, which reduces the frequency of maintenance.
  • the communicator is placed in parallel with field instruments and a control server and is powered by the same external source.
  • the communication between the different devices is done by the transmission line.
  • the operation of the analog sensor is controlled by disconnecting it from the current loop. This is done especially when the sensor is dismantled from its installation site.
  • the disconnection is not without drawback: the acquisition system generally interprets it as an open loop anomaly and generates an alarm. It is therefore necessary to intervene so that the anomaly is not treated as such by a control unit of the acquisition system.
  • the object of the invention is to overcome the problem of controlling the operation of an acquisition system or a sensor by disconnection - reconnection in a current loop of the type 4 - 20 mA or 0 - 20 mA.
  • the idea underlying the invention is to perform the control without opening the current loop.
  • the object of the invention is a current loop of the type 4-20 milliamps or 0-20 milliamps, connecting an analog sensor to an acquisition system respectively traversed by a sensor current and an acquisition current.
  • a test circuit connected in parallel with the current loop for injecting into said loop a superposition current superimposed on the sensor or acquisition current.
  • the superposition current injected into the current loop by the test circuit is superimposed on the current flowing through the sensor to simulate its operation vis-à-vis the acquisition system, or is superimposed on the current flowing through the acquisition system to simulate its operation vis-à-vis the analog sensor.
  • test circuit connected in parallel with the current loop thus makes it possible to inject a superposition current without opening the current loop connecting the acquisition system and the analog sensor.
  • This overcomes the drawbacks mentioned above: on the one hand, the risk of reversing the polarity of the sensor by reconnection is eliminated, on the other hand, no open loop anomaly is detected by the acquisition system during the test analog sensor.
  • the test circuit comprises a variable voltage generator connected in parallel to the acquisition system for injecting the superposition current by addition to the acquisition current, which makes it possible to control a low current threshold of the acquisition system.
  • the test circuit includes an ammeter connected in series with the variable DC generator to determine the intensity of the superposition current.
  • test circuit comprises a diode connected in series with the variable voltage generator to protect the current loop when the variable voltage is zero.
  • the test circuit comprises a diode connected in series with the acquisition system to preserve an operating independence of several current loops connecting several sensors to the same acquisition system.
  • the test circuit comprises a variable current regulator connected in parallel with the analog sensor for injecting the superposition current by addition to the sensor current, which makes it possible to control a high current threshold of the system. acquisition.
  • the test circuit comprises a variable current regulator mounted in parallel with the analog sensor for injecting the superposition current by addition to the sensor current, the superposition current being slaved to this sensor current, which makes it possible to maintain the acquisition current in the current loop.
  • the test circuit comprises an ammeter connected in series with the variable current regulator for determining the intensity of the simulation current.
  • the figure 1 shows in circuit diagram form a current loop with an analog sensor and an acquisition system and a test circuit connected in parallel to test the low current threshold of the acquisition system.
  • the figure 2 shows in circuit diagram form a current loop with an analog sensor and an acquisition system and a test circuit connected in parallel to test the high current threshold of the acquisition system.
  • the figure 3 shows as a circuit diagram a current loop with an analog sensor and an acquisition system and a test circuit connected in parallel to keep constant an acquisition current regardless of a sensor current.
  • a 4-20 mA current loop includes, figure 1 , an analog sensor 1 and an acquisition system 3.
  • the analog sensor is for example a pressure sensor mounted externally on a casing of a high-voltage electrical equipment such as a circuit breaker. It is clear however that the invention is not limited to such a pressure sensor, and applies to other analog sensors as operating in a 0-20 mA or 4-20 mA current loop. Examples of such sensors include temperature, flow, pH, or viscosity sensors.
  • the pressure sensor 1 is traversed by a sensor current Ic which is imposed by the pressure inside the envelope of the circuit-breaker filled with an arc-extinguishing dielectric gas.
  • the acquisition system 3 comprises a source of DC voltage V1, for example 24 volts (V).
  • V DC voltage
  • the source of voltage discharges in a series resistor R1 equal for example to 100 ohm ( ⁇ ) an acquisition current la.
  • An ammeter A1 is temporarily connected in parallel with a diode D1 in series with the acquisition system 3 to determine the intensity of the acquisition current Ia.
  • a test circuit is connected in parallel with the current loop to inject into said loop a superposition current which is superimposed on the sensor current or the acquisition current.
  • the test circuit comprises a variable voltage generator V4 V4 between 0 and 24 V connected in parallel to the acquisition system 3.
  • the generator 7 delivers a superposition current Is in a series resistor R4 equal for example to 100 ⁇ .
  • the superposition current Is is injected via the voltage generator 7 upstream of the pressure sensor 1 with respect to the direction of the acquisition current la to add to the latter, the sum Ia + Is being equal to the current Ic.
  • An ammeter A2 is connected in series with variable voltage generator V4 V4 to determine the intensity of the superposition current Is.
  • variable voltage V4 is gradually increased to increase the superposition current ls, and to reduce the acquisition current, taking into account the constancy of the sensor current Ic imposed by the constancy of the pressure inside the the envelope for the duration of the test.
  • the acquisition current is thus lowered to a low threshold to check the proper operation of the acquisition system without opening the current loop.
  • the test circuit comprises, figure 1 , a diode D2 connected in series with the generator 7 of variable voltage V4 for prevent the acquisition current 1a being partially diverted into the test circuit when the variable voltage V4 is low.
  • the test circuit comprises a variable DC regulator 9 connected in parallel with the analog sensor 1.
  • the superposition current Is is injected via variable current regulator 9 downstream of the pressure sensor 1 relative to the direction of the acquisition current 1c to add to the sensor current Ic, the sum Ic + Is being equal to the acquisition current la.
  • An ammeter A2 is mounted in series with variable DC regulator 9 to determine the intensity of the superposition current Is.
  • the superposition current ls is gradually increased to increase the acquisition current, given the constancy of the sensor current Ic imposed by the constancy of the pressure inside the envelope during the duration of the test. .
  • This increases the acquisition current la up to a high threshold to verify the proper operation of the acquisition system 3 without opening the current loop.
  • the sensor current lc is accessible from the acquisition current intensities Ia and superposition ls determined by ammeters A1 and A2 mounted in the test circuit.
  • the pressure of the dielectric gas contained in the envelope is monitored throughout the duration of the threshold testing of the acquisition system, using the test circuit connected in parallel with the current loop.
  • a leakage of the dielectric gas out of the envelope results in a decrease in the sensor current Ic and consequently in a drop in the superposition current Is easily determined by the ammeter A2.
  • the test circuit comprises a variable current regulator 11 connected in parallel with the pressure sensor 1 for injecting a superposition current ls by addition to the sensor current Ic, the superposition current ls being slaved to the acquisition current 1a.
  • the intensity of the acquisition current acquired by the acquisition system at the beginning of the test is assigned as a setpoint to the variable current regulator 11 by a servocontrol 13 connected to the ammeter A1 mounted parallel to the series diode D1 of the system. acquisition 3.
  • the sensor current Ic is progressively canceled by replacing it with the superposition current ls without opening said current loop.
  • Ic is zero, it is possible to disconnect the pressure sensor 1 from the current loop to control it while preventing an open loop anomaly detected by the acquisition system. No alarm is generated by the acquisition system.
  • test circuit is installed in a removable and portable housing which comprises connection pins intended to be connected to test sockets permanently mounted on the current loop.
  • One of the pins 13 is connected downstream of the diode D1 connected in series with the acquisition system in a common connection with the ammeter A1 determining the intensity of the acquisition current la.
  • the other 15 pin is connected downstream of the pressure sensor 1.
  • the ammeter A1 is integrated in the test box which in this case comprises a third pin 17 connected upstream of the diode D1 in a common connection with the 'ammeter.

Landscapes

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Structure Of Printed Boards (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)

Claims (10)

  1. Stromschleife, insbesondere vom Typ 4 - 20 Milliampere oder 0 - 20 Milliampere, die einen analogen Sensor (1) mit einem Erfassungssystem (3) verbindet, die von einem Fühlerstrom (Ic) bzw. einem Erfassungsstrom (Ia) durchlaufen werden, umfassend eine Schaltung zum Testen des korrekten Funktionierens, die parallel zur Stromschleife montiert ist, um es zu ermöglichen, dort einen Strom (Is) zu injizieren, der dem Fühlerstrom (Ic) oder dem Erfassungsstrom (Ia) überlagert wird, dadurch gekennzeichnet, dass die progressive Erhöhung des Überlagerungsstroms (Is) ausgenutzt wird, um das Funktionieren des Erfassungsystems bis zu einer unteren Schwelle bzw. bis zu einer oberen Schwelle des Stroms zu überprüfen.
  2. Stromschleife nach Anspruch 1, bei der die Testschaltung einen Generator (7) für eine variable Spannung (V4) umfasst, der parallel zum Erfassungssystem (3) montiert ist und der das Injizieren des Überlagerungsstroms (Is) erlaubt, wobei er die dem Fühlerstrom (Ic) entsprechende Summe aus dem Erfassungsstrom (Ia) und dem Überlagerungsstrom konstant hält, während der Oberlagerungsstrom erhöht wird, um das Funktionieren des Erfassungssystems bis zu einer unteren Schwelle des Stroms zu überprüfen.
  3. Stromschleife nach Anspruch 2, bei der die Testschaltung eine Diode (D2) umfasst, die in Reihe mit dem variablen Spannungsgenerator (7) montiert ist.
  4. Stromschleife nach Anspruch 2, bei der die Testschaltung eine Diode (D3) umfasst, die in Reihe mit dem Erfassungssystem montiert ist.
  5. Stromschleife nach Anspruch 2, bei der die Testschaltung ein Amperemeter (A2) umfasst, das in Reihe mit dem variablen Spannungsgenerator (7) montiert ist.
  6. Stromschleife nach Anspruch 1, bei der die Testschaltung einen variablen Stromregler (9) umfasst, der parallel zum analogen Sensor (1) montiert ist und das Injizieren des Überlagerungsstroms (Is) erlaubt, wobei er die dem Erfassungsstrom entsprechende Summe aus dem Fühlerstrom (Ic) und dem Überlagerungsstrom konstant hält, während der Überlagerungsstrom erhöht wird, um das Funktionieren des Erfassungssystems bis zu einer oberen Stromschwelle zu überprüfen.
  7. Stromschleife nach Anspruch 6, bei der die Testschaltung ein Amperemeter (A2) umfasst, das in Reihe mit dem variablen Stromregler (9) montiert ist.
  8. Stromschleife nach Anspruch 6, bei der der Stromregler (9) mit dem Erfassungsstrom (Ia) geregelt wird.
  9. Stromschleife nach einem der Ansprüche 1 bis 8, bei der der analoge Fühler ein Druckfühler einer Umhüllung eines elektrischen Geräts ist.
  10. Tragbarer Kasten, umfassend eine Testschaltung zum Testen einer Stromschleife nach einem der Ansprüche 1 bis 9, umfassend Anschlussstifte (13, 15, 17) die dazu ausgelegt sind, an Teststeckdosen angeschlossen zu werden, die dauerhaft an der Stromschleife montiert sind.
EP99929506A 1998-07-20 1999-07-19 Stromschleifensender mit prüfschaltung Expired - Lifetime EP1036385B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9809217 1998-07-20
FR9809217A FR2781301B1 (fr) 1998-07-20 1998-07-20 Boucle de courant du type 4-20 milliamperes ou 0-20 milliamperes comportant un circuit de test en parallele
PCT/FR1999/001764 WO2000005695A1 (fr) 1998-07-20 1999-07-19 Boucle de courant comportant un circuit de test

Publications (2)

Publication Number Publication Date
EP1036385A1 EP1036385A1 (de) 2000-09-20
EP1036385B1 true EP1036385B1 (de) 2008-05-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99929506A Expired - Lifetime EP1036385B1 (de) 1998-07-20 1999-07-19 Stromschleifensender mit prüfschaltung

Country Status (15)

Country Link
US (1) US6337570B1 (de)
EP (1) EP1036385B1 (de)
KR (1) KR20010024158A (de)
CN (1) CN1118784C (de)
AT (1) ATE397262T1 (de)
AU (1) AU4629999A (de)
BR (1) BR9906610A (de)
CA (1) CA2303980A1 (de)
DE (1) DE69938816D1 (de)
FR (1) FR2781301B1 (de)
ID (1) ID24131A (de)
NZ (1) NZ503395A (de)
TR (1) TR200000658T1 (de)
TW (1) TW510973B (de)
WO (1) WO2000005695A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7118273B1 (en) 2003-04-10 2006-10-10 Transmeta Corporation System for on-chip temperature measurement in integrated circuits
US7683796B2 (en) * 2006-10-04 2010-03-23 Honeywell International Inc. Open wire detection system and method
CN100529773C (zh) * 2006-11-10 2009-08-19 群康科技(深圳)有限公司 集成电路系统压合阻抗检测方法
DE102006058925A1 (de) * 2006-12-12 2008-06-19 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße
US9362071B2 (en) 2011-03-02 2016-06-07 Franklin Fueling Systems, Inc. Gas density monitoring system
CN104380419A (zh) 2012-02-20 2015-02-25 富兰克林加油系统公司 水分监视系统
CN111814302B (zh) * 2020-05-28 2024-03-08 嘉兴市恒光电力建设有限责任公司 一种变压器绝缘油温度采集传输回路故障排除系统及方法
US11315453B1 (en) * 2020-11-08 2022-04-26 Innolux Corporation Tiled display device with a test circuit

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US3829886A (en) * 1973-05-21 1974-08-13 Sperry Rand Corp Bistable semiconductor temperature sensor
US4213180A (en) * 1978-06-22 1980-07-15 The Bendix Corporation Closed loop sensor condition detector
US4633217A (en) * 1984-06-04 1986-12-30 Yamatake Honeywell Communication apparatus
US4634981A (en) * 1984-10-19 1987-01-06 Westinghouse Electric Corp. Method for testing a circuit breaker using a three terminal current transformer
US4607247A (en) * 1985-08-12 1986-08-19 The Babcock & Wilcox Company On-line serial communication interface from a transmitter to a current loop
JP2735174B2 (ja) * 1985-10-16 1998-04-02 株式会社日立製作所 ２線式通信方法
JP2580343B2 (ja) * 1989-10-13 1997-02-12 株式会社日立製作所 フィールド計器システム及びコミュニケータ
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US5563587A (en) * 1994-03-21 1996-10-08 Rosemount Inc. Current cancellation circuit
US5574378A (en) * 1994-12-15 1996-11-12 Square D Company Insulation monitoring system for insulated high voltage apparatus
DE59510114D1 (de) * 1995-02-17 2002-04-25 Siemens Metering Ag Zug Anordnung zur Temperaturkompensation
US5805062A (en) * 1996-10-21 1998-09-08 Mini-Systems, Inc. 2-wire optovoltaic loop-powered isolation amplifier with current bootstrapping
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US6104791A (en) * 1998-06-11 2000-08-15 Conexant Systems, Inc. System and method for performing telephone line-in-use detection, extension pick-up detection, and remote hang-up detection in a modem

Also Published As

Publication number Publication date
TR200000658T1 (tr) 2000-11-21
NZ503395A (en) 2001-04-27
TW510973B (en) 2002-11-21
ATE397262T1 (de) 2008-06-15
WO2000005695A1 (fr) 2000-02-03
CA2303980A1 (fr) 2000-02-03
EP1036385A1 (de) 2000-09-20
US6337570B1 (en) 2002-01-08
ID24131A (id) 2000-07-06
AU4629999A (en) 2000-02-14
BR9906610A (pt) 2000-09-19
CN1118784C (zh) 2003-08-20
KR20010024158A (ko) 2001-03-26
CN1274452A (zh) 2000-11-22
FR2781301A1 (fr) 2000-01-21
DE69938816D1 (de) 2008-07-10
FR2781301B1 (fr) 2000-09-08

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