EP0809808A1 - Procede de determination d'un courant de defaut a la terre - Google Patents

Procede de determination d'un courant de defaut a la terre

Info

Publication number
EP0809808A1
EP0809808A1 EP96902869A EP96902869A EP0809808A1 EP 0809808 A1 EP0809808 A1 EP 0809808A1 EP 96902869 A EP96902869 A EP 96902869A EP 96902869 A EP96902869 A EP 96902869A EP 0809808 A1 EP0809808 A1 EP 0809808A1
Authority
EP
European Patent Office
Prior art keywords
current
earth
transformers
phase
current transformers
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Withdrawn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
EP96902869A
Other languages
German (de)
English (en)
Inventor
Ulrich Baumgärtl
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0809808A1 publication Critical patent/EP0809808A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks
    • H02H1/046—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks upon detecting saturation of current transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Measuring current only
    • 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
    • H02H3/26—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H02H3/347—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 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using summation current transformers

Definitions

  • the invention relates to a method for detecting a
  • Earth fault current in a multi-phase network with vectorial summation of the output signals of each current transformer assigned to each phase of the network and the neutral conductor.
  • earth currents can be measured directly, specifically by an earth transformer in the transformer star point or by a summation current transformer (US Pat. No. 5,195,009).
  • the very good accuracy of such measurement methods can be countered by the increased effort or the given network configuration.
  • the object of the invention is to carry out the ground fault detection on the one hand with inexpensive current transformers and on the other hand to avoid false tripping in the interest of the operational safety of the systems to be protected.
  • this object is achieved in that the vectorial sum of the current formed from the currents of the phases and the current of the neutral conductor around the product of the maximum current measured at the same time, which flows in one of the phases or in the neutral conductor, and the Linearity error of the current transformer concerned is reduced.
  • the effort for the implementation of the invention is low compared to the use of current transformers with great accuracy.
  • the new process is equally suitable for current transformers with an iron core or for air converters with a large dynamic range.
  • the invention can advantageously be implemented using a non-volatile memory for storing the percentage linearity error of all current transformers used.
  • Figure 1 shows an example of the course of the
  • FIG. 3 The method according to the invention is illustrated in FIG. 3 using a flow chart.
  • the straight line G represents the linear transmission of a primary current I pr i m into a secondary current I sec , as is achieved by an ideal current transformer.
  • I pr primary current
  • I sec secondary current
  • the linearity error F is therefore a function of the current. This results in a tolerance band T with a percentage error F.
  • the vectorial sum of the errors ⁇ F is plotted in FIG. 2 as a current value over the primary current Iprim.
  • the tolerance band T1 corresponds to a course as it results without special measures.
  • a limit value I gg of the earth current can be reached solely on the basis of the tolerance of the current transformers, which leads to tripping.
  • the method as provided by the invention produces a corrected tolerance band T2 in which a false triggering is excluded. 3 shows how the tolerance band T2 is generated.
  • a circuit breaker LS is shown schematically, the switch contacts of which are arranged in the course of the phase conductors L1, L2 and L3 of a three-phase network.
  • a current transformer W1, W2 or W3 and WN is assigned to each of these conductors and a neutral conductor N. These current transformers are considerate of what is desirable
  • the volume of the circuit breaker LS is dimensioned such that errors corresponding to curve K in FIG. 1 can occur.
  • the circuit breaker LS has a switching mechanism SM, shown as a symbol, which can be actuated by an electronic release.
  • the electronic release is not shown completely, since in the present context only the release due to an earth current is considered.
  • a microprocessor ⁇ P is indicated, which controls the processes to be explained below.
  • FIG. 3 forms a flow chart which illustrates the individual steps of the new method for measuring the first current.
  • the method according to the invention begins with the reading in of the measured values provided by the current transformers W1, W2, W3 and WN.
  • the branch of the flowchart shown on the left shows that the largest current I max selected from the measured values of the phase currents I L1 , I L2 , I L3 and the current in neutral conductor I N is an associated error F (I max ) as a percentage value an error table is read out, which is contained in a read-only memory ROM.
  • Another branch of the flow chart shown on the right illustrates the determination of the vectorial sum of all measured currents ⁇ (I L1 , I L2 »I L > I N ).
  • a comparison is carried out as to whether I g is greater or less than a limit value I gg set by the user of the circuit breaker LS. If this condition is met, the microprocessor initiates ⁇ P through the TRIGGER block the actuation of the switching mechanism SM and thus the opening of the switching contacts in the course of the conductors Ll, L2 and L3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

La présente invention concerne un procédé de détermination d'un courant de défaut à la terre (Ig) dans un réseau polyphasé (L1, L2, L3, N), procédé qui est fondé sur l'emploi de transformateurs de courant ordinaires à noyau de fer (W1, W2, W3, WN) pour les conducteurs de phases (L1, L2, L3) et le neutre (N). On tient compte du défaut de linéarité (F(I)) des transformateurs de courant (W1, W2, W3, WN) en retranchant, de la somme vectorielle des courants ( SIGMA I), le produit de la plus grande intensité de phase et du défaut correspondant (F*Imax). On réalise ainsi une position d'un seul côté de la bande de tolérance du courant mesuré de défaut à la terre et l'on évite des disjonctions intempestives.
EP96902869A 1995-02-15 1996-02-09 Procede de determination d'un courant de defaut a la terre Withdrawn EP0809808A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19506860 1995-02-15
DE19506860A DE19506860C1 (de) 1995-02-15 1995-02-15 Verfahren zur Erfassung eines Erdschlußstromes
PCT/DE1996/000255 WO1996025671A1 (fr) 1995-02-15 1996-02-09 Procede de determination d'un courant de defaut a la terre

Publications (1)

Publication Number Publication Date
EP0809808A1 true EP0809808A1 (fr) 1997-12-03

Family

ID=7755190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96902869A Withdrawn EP0809808A1 (fr) 1995-02-15 1996-02-09 Procede de determination d'un courant de defaut a la terre

Country Status (5)

Country Link
US (1) US6005393A (fr)
EP (1) EP0809808A1 (fr)
JP (1) JPH10513567A (fr)
DE (1) DE19506860C1 (fr)
WO (1) WO1996025671A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19634439A1 (de) * 1996-08-26 1998-03-05 Siemens Ag Verfahren und Einrichtung zum Messen von Fehlerströmen
US6154036A (en) * 1999-03-18 2000-11-28 Abb Power T&D Company Inc. Ground fault location system and ground fault detector therefor
US6249230B1 (en) 1999-03-18 2001-06-19 Abb Power T&D Company Inc. Ground fault location system and ground fault detector therefor
FI120565B (fi) * 2007-12-20 2009-11-30 Abb Oy Menetelmä ja laitteisto maasulun havaitsemiseen
US7965478B2 (en) * 2009-06-29 2011-06-21 Rockwell Automation Technologies, Inc. System and method for detecting a fault condition
JP1518452S (fr) * 2014-04-30 2015-03-02
JP1518605S (fr) * 2014-04-30 2015-03-02
AT523238B1 (de) * 2019-11-29 2024-07-15 B & R Ind Automation Gmbh Validierung von Phasenströmen eines Mehrphasensystems
CN111044935B (zh) * 2019-12-31 2022-06-21 苏州华电电气股份有限公司 变压器铁芯多点接地带电检测装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974446A (en) * 1975-04-10 1976-08-10 Schweitzer Edmund O Jun Polyphase fault current flow detecting and resetting means
US4104689A (en) * 1976-09-29 1978-08-01 Electric Machinery Manufacturing Company Vacuum contactor protector
GB2069262B (en) * 1980-02-11 1983-02-23 English Electric Co Ltd Protecting polyphase rectifiers
DE3108906A1 (de) * 1981-03-09 1982-09-16 Siemens AG, 1000 Berlin und 8000 München "verfahren zur ueberwachung von leiterstroemen und anordnung zur durchfuehrung des verfahrens"
FR2649259B1 (fr) * 1989-07-03 1991-09-13 Merlin Gerin Declencheur statique comportant un systeme de desensibilisation de la protection terre
US5195009A (en) * 1991-08-27 1993-03-16 Siemens Energy & Automation, Inc. Current summing arrangement for ground fault detection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9625671A1 *

Also Published As

Publication number Publication date
US6005393A (en) 1999-12-21
JPH10513567A (ja) 1998-12-22
DE19506860C1 (de) 1996-08-08
WO1996025671A1 (fr) 1996-08-22

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