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WO1996032653A1 - Procede pour effectuer des mesures de distance sur une ligne de transport d'energie a haute tension - Google Patents

Procede pour effectuer des mesures de distance sur une ligne de transport d'energie a haute tension Download PDF

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Publication number
WO1996032653A1
WO1996032653A1 PCT/DE1996/000629 DE9600629W WO9632653A1 WO 1996032653 A1 WO1996032653 A1 WO 1996032653A1 DE 9600629 W DE9600629 W DE 9600629W WO 9632653 A1 WO9632653 A1 WO 9632653A1
Authority
WO
WIPO (PCT)
Prior art keywords
type
filters
impedance
transmission line
fir
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.)
Ceased
Application number
PCT/DE1996/000629
Other languages
German (de)
English (en)
Inventor
Andreas Jurisch
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 WO1996032653A1 publication Critical patent/WO1996032653A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • 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
    • H02H3/40—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 ratio of voltage and current
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/06—Non-recursive filters

Definitions

  • the invention relates to a method for performing distance measurements on an electrical high-voltage transmission line, in which measured variables derived from the current and voltage of the high-voltage transmission line are digitized and evaluated in a digital filter unit, which is made up of two linear-phase, non-recursive digital filters (FIR-Fil ⁇ ter) of a first type with an amplitude response H (j ⁇ ) and weight factors h ⁇ and consists of at least one FIR filter of a second type with an amplitude response G (j ⁇ ) and weight factors g ⁇ , the individual weight factors hj_, g ⁇ der FIR filters are freely specified, the error correction is carried out by means of a correction factor which is formed as a quotient from the amplitude responses H ( ⁇ ), G ( ⁇ ) of the FIR filters of the first and second type, which in the operating behavior of the High-voltage transmission lines describing differential equations occurring parameters from the evaluated outputs variables are determined in a computing unit and a measuring impedance indicating the respective distance to
  • the invention has for its object to provide a method for performing distance measurements on a high-voltage transmission line with FIR filters, with which accurate distance measurements can be carried out in an optimally short time.
  • T___ denote the sampling time and ( net the network frequency of the high-voltage transmission line; a comparison impedance is determined with the output signals of the further FIR filters and the distance measurement is considered to be sufficiently accurate if the difference between the measurement impedance and holds the comparison impedance within a predefined size.
  • the predefined size is to be understood as a fraction of the currently determined measurement impedance, so that - regardless of the measurement impedance measured in each case - the permitted relative difference between measurement and comparison impedance is always the same size.
  • a major advantage of the method according to the invention is that it may be possible to dispense with repeated measurements if the first measurement already detects a difference between the measurement and comparison impedance that lies within a predetermined size.
  • the numerator degree n can be chosen as an even or odd number; if it is chosen as an even number, the phase rotation caused by the filter, for which the degree n / 2 is the decisive factor, is multiplied by an integer.
  • FIG. 1A shows an equivalent circuit diagram of a high-voltage transmission line to be monitored as part of a distance measurement
  • 1B shows the representation of the normalized differential equation describing the behavior of the high-voltage transmission line in a block diagram
  • FIG. 2 shows the principle of the method according to the invention in a block diagram.
  • FIG. 1A The diagram of an electrical high-voltage transmission line shown in FIG. 1A has a network inductance L f j and an ohmic network resistance R ⁇ . It is traversed by a mains current ijj; A mains voltage u ⁇ can be tapped at the terminals of the high-voltage network.
  • the quantities ijj and uj represent the output quantities of the high-voltage transmission line.
  • the differential equation describing the high-voltage transmission line is:
  • Measurement of the quantities u, x and x can be determined at two different times t ⁇ and t2. The prerequisite for this is that the arrangement at times ti and t2 is in two mutually independent states.
  • the parameters a and b are determined without forming the first time derivative of the standardized current x by the standardized ones
  • Output variables u and x are evaluated in a filter unit.
  • Such an evaluation is carried out by convolution operations (symbolically represented by * in the block diagram according to FIG. 2).
  • the normalized output variable u is converted to a digital FIR filter 3 via an analog-digital converter 2 (cf. FIG. 2), which converts the output variable u into a number sequence u ⁇ after sampling with a correspondingly selected sampling time T_ ⁇ fed.
  • a sequence yj ⁇ is created, the imaging rule of which is:
  • Equation (4) is a linear equation free of derivatives of the output quantity x with two unknowns, namely the parameters a and b, which is obtained by determining, evaluating and inserting two linearly independent samples of u and x is solvable and from which a measuring impedance Z m can be determined.
  • the parameters a and b which is obtained by determining, evaluating and inserting two linearly independent samples of u and x is solvable and from which a measuring impedance Z m can be determined.
  • a computing module 10 determines a comparison impedance Z v in accordance with the procedure for determining the measurement impedance Z m according to EP 0 284 546 B1 , then the comparison impedance Z v results in parallel to the measurement impedance.
  • the variables corresponding to these two impedances Z m and Z v at the output of the arithmetic module 10 are fed to a difference former 11, which is followed by a limit value stage 12. Applies e.g.
  • the measuring impedance is then considered to be sufficiently precisely determined and a trigger signal is generated immediately without waiting for another measured value, that is to say without repeating the measurement.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention a pour objet un procédé destiné à effectuer des mesures de distance sur une ligne de transport d'énergie à haute tension, dans lequel des grandeurs mesurées dérivées du courant et de la tension de la ligne de transport d'énergie à haute tension sont numérisées et traitées dans une unité de filtrage numérique comprenant deux filtres FIR non récursifs, en phase linéaire, d'un premier type, et au moins un filtre FIR d'un deuxième type. Les différents facteurs de pondération sont prédéterminés librement, et une correction d'erreur est effectuée au moyen d'un facteur de correction. A partir des valeurs de sortie pondérées de l'unité de filtrage, sont déterminés, dans un ordinateur, des paramètres à partir desquels une impédance indiquant la distance jusqu'à un point d'erreur est déterminée. En vue d'effectuer des mesures de distance précises en un temps le plus court possible, conformément à l'invention, les valeurs mesurées numérisées (u, x) sont traitées dans l'unité de filtrage (1) dans deux autres filtres FIR (8, 9) d'un troisième type, et une impédance de référence (Zv) est déterminée à partir des signaux de sortie des autres filtres FIR (8, 9). La mesure de distance est considérée comme suffisamment précise si la différence entre l'impédance mesurée (Zm) et l'impédance de référence (Zv) demeure en dessous d'une valeur prédéterminée.
PCT/DE1996/000629 1995-04-13 1996-04-03 Procede pour effectuer des mesures de distance sur une ligne de transport d'energie a haute tension Ceased WO1996032653A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19514695.6 1995-04-13
DE1995114695 DE19514695C1 (de) 1995-04-13 1995-04-13 Verfahren zum Durchführen von Distanzmessungen an einer elektrischen Hochspannungsübertragungsleitung

Publications (1)

Publication Number Publication Date
WO1996032653A1 true WO1996032653A1 (fr) 1996-10-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000629 Ceased WO1996032653A1 (fr) 1995-04-13 1996-04-03 Procede pour effectuer des mesures de distance sur une ligne de transport d'energie a haute tension

Country Status (2)

Country Link
DE (1) DE19514695C1 (fr)
WO (1) WO1996032653A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6420875B1 (en) * 2000-03-22 2002-07-16 General Electric Company CVT transient filter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284546A1 (fr) * 1987-03-23 1988-09-28 Siemens Aktiengesellschaft Procédé pour tester des dispositifs
DE4018170A1 (de) * 1990-06-01 1991-12-05 Siemens Ag Verfahren zur pruefung von anordnungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284546A1 (fr) * 1987-03-23 1988-09-28 Siemens Aktiengesellschaft Procédé pour tester des dispositifs
DE4018170A1 (de) * 1990-06-01 1991-12-05 Siemens Ag Verfahren zur pruefung von anordnungen

Also Published As

Publication number Publication date
DE19514695C1 (de) 1996-10-24

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