EP3935703A1 - Localisation d'un défaut à la terre dans un réseau à tension continue - Google Patents

Localisation d'un défaut à la terre dans un réseau à tension continue

Info

Publication number
EP3935703A1
EP3935703A1 EP20714942.8A EP20714942A EP3935703A1 EP 3935703 A1 EP3935703 A1 EP 3935703A1 EP 20714942 A EP20714942 A EP 20714942A EP 3935703 A1 EP3935703 A1 EP 3935703A1
Authority
EP
European Patent Office
Prior art keywords
load zone
lines
line
main
load
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Withdrawn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
EP20714942.8A
Other languages
German (de)
English (en)
Inventor
Hubert Schierling
Benno Weis
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 EP3935703A1 publication Critical patent/EP3935703A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • 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
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
    • 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
    • H02H3/16—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 fault current to earth, frame or mass
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Definitions

  • the invention relates to a method for locating an earth fault in a direct current network to which several load zones can be connected.
  • a direct current network isolated from a ground potential or grounded via a high impedance can continue to operate in the event of a ground fault in a DC voltage potential.
  • the earth fault itself can be determined by measuring and evaluating the voltages between the
  • Direct voltage potentials of the direct current network and a ground potential can be easily detected. However, it is difficult to identify the load zone connected to the direct current network in which the earth fault occurred. However, it is important to identify the load zone in which the earth fault occurred in order to switch off the faulty load zone and eliminate the earth fault.
  • a so-called common-mode current i.e. a fault current that is the sum of the currents in the two connection lines, could be used, for example, at a connection point of each load zone with the direct current network, for example at the input of a control cabinet the load zone to the main lines of the
  • DC network is to be measured. If one of the common mode currents differs from zero, this indicates that the earth fault has occurred in the associated load zone.
  • the measurements of the common mode currents could be carried out permanently or manually by maintenance personnel, for example. However, such measurements are complex in any case.
  • the invention is based on the object of specifying an improved method for locating a ground fault in a direct current network, to which several load zones can be connected.
  • the object is achieved according to the invention by a method with the features of claim 1 and a direct current network with the features of claim 7.
  • the method according to the invention is used to locate an earth fault in a direct current network to which several load zones can be connected, each load zone having two symmetrically earthed load zone lines, of which a first load zone line can be connected to a first main line of the direct current network and the second load zone line can be connected to can be connected to a second main line of the direct current network.
  • a line voltage is continuously measured for each load zone line between a line potential on which the load zone line is located and a ground potential.
  • the main lines are disconnected from both load zone lines of one of the load zones and the ground fault is assigned to this load zone if there is a difference in the magnitude of the line voltages of the two load zone lines in this load zone after Separation of the main lines from the load zone lines is not significantly reduced.
  • Symmetrical grounding of the two load zone lines of a load zone is understood to mean a similar grounding of the two load zone lines, which in ground fault-free operation keeps the line potentials of the load zone lines symmetrical about the ground potential, for example ohmic-capacitive grounding of both load zone lines by connecting a grounding capacitor in parallel and a grounding resistor with grounding capacitors of the same capacitance and grounding resistances of the same resistance values. Furthermore, it is always assumed here and in the following that the direct current network is isolated from the earth potential or earthed via a high impedance.
  • connection of a load zone line with a main line of the direct current network can be direct or indirect, with one Indirect connection can exist, for example, if the direct current network is structured hierarchically, with a top hierarchy level that is directly connected to the main lines, and at least one further hierarchy level that is above the hierarchy level above it or the hierarchy levels above it with the main lines connected is.
  • the method according to the invention takes advantage of the fact that a ground fault affecting a load zone line of a load zone causes the line potentials of the load zone lines to be asymmetrical with respect to the ground potential, so that the two line potentials are no longer symmetrical about the ground potential. If the earth fault is generated outside the load zone, for example in another load zone or directly on a main line, the symmetry of the line potentials of the load zone lines with respect to the earth potential will be restored after the main lines are disconnected from the load zone lines of the load zone, since the Earth fault then no longer affects the line potential.
  • the asymmetry of the line potentials of the load zone lines compared to the earth potential will not change or even increase slightly after the main lines have been separated from the load zone lines.
  • the difference in amount between the amounts of the line voltages of the two load zone lines of this load zone will decrease if the earth fault is generated outside the load zone, and will remain the same or increase if the earth fault is inside the load zone is produced. This is used according to the invention to locate a ground fault detected on a main line.
  • a separation time is specified and after the earth fault has been detected on a main line, the main lines are used for the separation time from the load zone lines of a load zone. separates.
  • This refinement of the method takes advantage of the fact that a short separation of the main lines from the load zone lines of a load zone is usually sufficient to determine and evaluate the amount difference between the amounts of the line voltages of the two load zone lines of this load zone. Typically, for example, one separation is sufficient for a separation duration in the range from 1 ms to 1 s.
  • a separation of the main lines from the load zone lines of a load zone as short as possible is advantageous in order to impair the operation of the load zone as little as possible through the separation.
  • an absolute or relative minimum reduction is specified and a reduction in the amount difference between the amounts of the line voltages of the two load zone lines of a load zone after they have been separated from the main lines is classified as significant if the reduction in the amount difference is the minimum reduction surpasses. For example, a minimum reduction of 2% to 30%, in particular of about 10% of a DC voltage that lies between the main lines in normal operation of the DC network is given.
  • the main lines are successively separated from the two load zone lines of different load zones until the ground fault is assigned to a load zone. This allows systematic Search for a load zone in which the earth fault is generated. If the earth fault has not been assigned to a load zone after the search has been completed, it can also be concluded that the earth fault is generated directly on the main line on which it was also detected.
  • a direct current network according to the invention comprises:
  • each having a first load zone line which can be connected to a first main line of the direct current network via a first switch
  • a second load zone line which can be connected to the second main line of the direct current network via a second switch
  • a measuring unit which is set up to continuously measure a line voltage between a line potential on which the load zone line is connected and an earth potential
  • an earth fault monitoring unit that is set up to detect earth faults on the main lines
  • a control unit for controlling the switches which is set up to disconnect the main lines from both load zone lines of a load zone by opening the switches connecting the load zone lines to the main lines in the event that the ground fault monitoring unit detects a ground fault on a main line of the direct current network ,
  • the first switch or the second switch of each load zone is an electronic switch, or both switches are electronic switches.
  • control unit can be set up to only disconnect the main lines from the load zone lines of a load zone for a specified separation period after detecting a ground fault on a main line, for example for a separation period in the range from 1 ms to 1 s.
  • the evaluation unit can be set up to classify a reduction in the amount difference between the amounts of the line voltages of the two load zone lines of a load zone as significant after the main lines have been disconnected from these load zone lines if the reduction in the amount difference exceeds a specified minimum reduction.
  • a direct current network according to the invention enables the method according to the invention to be implemented with the advantages already mentioned above.
  • FIG. 1 shows a block diagram of a direct current network to which several load zones can be connected
  • FIG. 2 shows a block diagram of a load zone and a switching unit with which the load zone can be switched to the direct current network. Corresponding parts are provided with the same reference numerals in the figures.
  • Figure 1 shows schematically an embodiment of a
  • Direct current network 1 to which several load zones 3, 5 can be switched on.
  • the direct current network 1 is isolated from a ground potential or grounded via a high impedance.
  • the direct current network 1 has two electrical main lines 7, 9, a connection unit 10, 12 and a control unit 13, a ground fault monitoring unit 15 and an evaluation unit 17 for each load zone 3, 5.
  • Each load zone 3, 5 has an electrical load 19, 21, for example an electrical machine and a converter connected upstream of the electrical machine on the network side.
  • a first main line 7 lies on a first direct voltage potential of the direct current network 1.
  • the second main line 9 lies on a second direct voltage potential of the direct current network 1.
  • connection unit 10, 12 is assigned to a load zone 3, 5, which can be connected to the direct current network 1 by the connection unit 10, 12.
  • the control unit 13 is connected to the connection units 10, 12, the earth fault monitoring unit 15 and the evaluation unit 17. From the control unit 13 the switching th of the load zones 3, 5 is controlled.
  • the earth fault monitoring unit 15 is set up to detect earth faults on the main lines 7, 9.
  • the earth fault monitoring unit 15 is connected to each main line 7, 9 and is set up to measure the voltages between the earth potential and the DC potentials on which the main lines 7, 9 are located. Further If the earth fault monitoring unit 15 is set up to report a detected earth fault to the control unit 13.
  • the evaluation unit 17 is connected to the control unit 13 and the connection units 10, 12 and is set up to evaluate line voltages of the load zones 3, 5 in the manner described in more detail below.
  • FIG. 2 shows an example of a block diagram of the load zone 3 and the connection unit 10, with which the load zone 3 dem
  • Direct current network 1 can be switched on.
  • the load zone 3 has a first load zone line 31 which is grounded in a high-impedance, ohmic-capacitive manner via a parallel connection of a first grounding capacitor 33 and a first grounding resistor 35. Furthermore, the load zone 3 has a second load zone line 32 which is grounded in a high-impedance, ohmic-capacitive manner via a parallel connection of a second ground capacitor 34 and a second ground resistor 36.
  • the two load zone lines 31, 32 are symmetrically grounded, the grounding capacitors 33 having the same capacities and the grounding resistors 35, 36 having the same resistance values, in order to keep load zone potentials on which the load zone lines 31, 32 are symmetrical to the ground potential in error-free operation .
  • connection unit 10 has two network-side connections 41, 42, two load zone-side connections 43, 44, two switches 45, 51 and two measuring units 53, 54.
  • a first network-side connection 41 is with the first
  • the second connection 42 is connected to the second main line 9.
  • a first load zone-side connection 43 is connected to the first load zone line 31.
  • the second connection 44 on the load zone side is connected to the second load zone line 32.
  • a first switch 45 is connected between the first connection 41 on the network side and the first connection 43 on the load zone side.
  • the first switch 45 is an electronic switch which has two turn-off semiconductor switches 55, 56 and two diodes 57, 58.
  • the semiconductor switches 55, 56 are connected in anti-series, that is to say the semiconductor switches 55, 56 are connected in series, but with opposite forward directions. Each diode 57, 58 is connected in antiparallel to one of the semiconductor switches 55, 56.
  • the first switch 45 is designed as a fast switch that can switch off short-circuit currents.
  • the second switch 51 is connected between the second connection 42 on the network side and the second connection 44 on the load zone side.
  • the second switch 51 is, for example, a mechanical load break switch.
  • the second switch 51 can also be designed as an electronic switch like the first switch 45.
  • the first switch 45 (or its semiconductor switch 55, 56) and the second switch 51 can be controlled by the control unit 13.
  • a first measuring unit 53 is set up to continuously measure a first line voltage assigned to the first load zone line 31 between the line potential on which the first load zone line 31 is located and the ground potential.
  • the second measuring unit 54 is set up to continuously measure a second line voltage assigned to the second load zone line 32 between the line potential on which the second load zone line 32 lies and the ground potential.
  • the measuring units 53, 54 transmit the measuring signals recorded by them to the evaluation unit 17.
  • the second load zone 5 (and every other load zone that can be connected to the direct current network 1) also has two symmetrically grounded load zone lines 31, 32 and can be connected to the direct current network 1 by a connecting unit 12 designed like the connecting unit 10. According to the invention, in the event that a ground fault is detected on a main line 7, 9 of the direct current network 1, both main lines 7, 9 are separated from those connected to them
  • the evaluation unit 17 After the main lines 7, 9 have been separated from the load zone lines 31, 32 of a load zone 3, 5, the evaluation unit 17 checks whether there is a difference in amount between the amounts of the line voltages of the two load zone lines 31, 32 of this load zone 3, 5 is not significantly reduced or the amounts of the line voltages of the two load zone lines 31, 32 are equal. If the difference in amount is not significantly reduced, the evaluation unit 17 assigns the earth fault to this load zone 3, 5.
  • the main lines 7, 9, after the detection of a ground fault on a main line 7, 9, is successively disconnected from both load zone lines 31, 32 of different load zones 3, 5 for a predetermined separation period until the ground fault of a load zone 3, 5 is assigned.
  • the separation of the main lines 7, 9 from the load zone lines 31, 32 of a load zone 3, 5 is preferably carried out at a time when the load 19, 21 of the load zone 3, 5 does not require any energy or the required energy is buffered for the duration of the separation can be, for example, by a (not shown) storage capacitor which is connected between the load zone lines 31, 32 of the load zone 3, 5.
  • Direct current network 1 can be modified in various ways to further embodiments.
  • the evaluation unit 17 is integrated in the control unit 13 or in the earth fault monitoring unit 15.
  • a local evaluation unit 17 is provided for each connection unit 10, 12, which evaluates the line voltages of the load zone lines 31, 32 of the connection unit 10, 12.
  • each connection unit 10, 12 has a local control unit 13 which is set up to switch 45, 51 of the connection unit in the event that a ground fault is detected on a main line 7, 9 of the direct current network 1 10, 12 open for a period of separation.
  • a local evaluation unit 17 can also be integrated in the local control unit 13.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Locating Faults (AREA)

Abstract

L'invention se rapporte à la localisation d'un défaut à la terre dans un réseau à tension continue. Cette invention concerne un procédé pour localiser un défaut à la terre dans un réseau à tension continue (1) auquel plusieurs zones de charge (3, 5) peuvent être raccordées, chaque zone de charge (3, 5) comprenant deux lignes de zone de charge (31, 32) dont la mise à la terre est symétrique. Selon ce procédé, une tension de ligne est mesurée, en continu, pour chaque ligne de zone de charge (31, 32), entre un potentiel de ligne sur lequel se trouve la ligne de zone de charge (31, 32) et un potentiel de terre. Si un défaut à la terre est détecté au niveau d'une ligne principale (7, 9) du réseau à tension continue (1), les lignes principales (7, 9) des deux lignes de zone de charge (31, 32) d'une zone de charge (3, 5) sont séparées et le défaut à la terre est associé à cette zone de charge (3, 5), lorsqu'une différence de valeur entre les valeurs des tensions de lignes des deux lignes de zone de charge (31, 32) de cette zone de charge (3, 5) n'est pas significativement réduite après la séparation des lignes principales (7, 9) des lignes de zone de charge (31, 32).
EP20714942.8A 2019-04-08 2020-03-18 Localisation d'un défaut à la terre dans un réseau à tension continue Withdrawn EP3935703A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19167786.3A EP3723220B1 (fr) 2019-04-08 2019-04-08 Emplacements d'une perte à la terre dans un réseau à courant continue
PCT/EP2020/057454 WO2020207730A1 (fr) 2019-04-08 2020-03-18 Localisation d'un défaut à la terre dans un réseau à tension continue

Publications (1)

Publication Number Publication Date
EP3935703A1 true EP3935703A1 (fr) 2022-01-12

Family

ID=66102475

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19167786.3A Active EP3723220B1 (fr) 2019-04-08 2019-04-08 Emplacements d'une perte à la terre dans un réseau à courant continue
EP20714942.8A Withdrawn EP3935703A1 (fr) 2019-04-08 2020-03-18 Localisation d'un défaut à la terre dans un réseau à tension continue

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19167786.3A Active EP3723220B1 (fr) 2019-04-08 2019-04-08 Emplacements d'une perte à la terre dans un réseau à courant continue

Country Status (5)

Country Link
US (1) US11754613B2 (fr)
EP (2) EP3723220B1 (fr)
CN (1) CN113924706B (fr)
ES (1) ES2906399T3 (fr)
WO (1) WO2020207730A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3713029A1 (fr) * 2019-03-18 2020-09-23 Siemens Aktiengesellschaft Localiser une fuite à la terre dans un réseau à courant continu avec plusieurs zones de charge
DE102021117260A1 (de) 2021-07-05 2023-01-05 Phoenix Contact Gmbh & Co. Kg Fehlerstromüberwachung für ein Gleichspannungsschaltgerät
BE1029560B1 (de) 2021-07-05 2023-02-06 Phoenix Contact Gmbh & Co Fehlerstromüberwachung für ein Gleichspannungsschaltgerät

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JP3056946B2 (ja) * 1994-05-31 2000-06-26 東京電力株式会社 電力貯蔵用二次電池の地絡位置検出方法及びその装置
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Also Published As

Publication number Publication date
US11754613B2 (en) 2023-09-12
WO2020207730A1 (fr) 2020-10-15
EP3723220A1 (fr) 2020-10-14
CN113924706A (zh) 2022-01-11
ES2906399T3 (es) 2022-04-18
US20220170977A1 (en) 2022-06-02
EP3723220B1 (fr) 2022-02-09
CN113924706B (zh) 2025-04-25

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