WO2023022580A1 - Procédé de protection de deux lignes parallèles - Google Patents

Procédé de protection de deux lignes parallèles Download PDF

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Publication number
WO2023022580A1
WO2023022580A1 PCT/KZ2021/000019 KZ2021000019W WO2023022580A1 WO 2023022580 A1 WO2023022580 A1 WO 2023022580A1 KZ 2021000019 W KZ2021000019 W KZ 2021000019W WO 2023022580 A1 WO2023022580 A1 WO 2023022580A1
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WO
WIPO (PCT)
Prior art keywords
current
line
currents
iref2
time
Prior art date
Application number
PCT/KZ2021/000019
Other languages
English (en)
Russian (ru)
Inventor
Бауыржан Ерболович МАШРАПОВ
Ризагуль Мегданиятовна МАШРАПОВА
Марк Яковлевич Клецель
Динара Амирбеккызы АМИРБЕК
Original Assignee
Некоммерческое Акционерное Общество "Торайгыров Университет"
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 Некоммерческое Акционерное Общество "Торайгыров Университет" filed Critical Некоммерческое Акционерное Общество "Торайгыров Университет"
Priority to PCT/KZ2021/000019 priority Critical patent/WO2023022580A1/fr
Publication of WO2023022580A1 publication Critical patent/WO2023022580A1/fr

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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
    • 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

Definitions

  • the invention relates to the electric power industry, namely to relay protection technology, and can be used to protect two parallel lines from short circuits.
  • the disadvantage of this method is the need to perform a large number of operations and the associated difficulty of implementation and low reliability.
  • the disadvantage of this method is the limited sensitivity of the protection to short circuits on the lines.
  • the objective of the invention is to increase the sensitivity of protection by reducing the zone of cascade action.
  • the time t 3T 2 is counted after the instantaneous values of the currents ii or 12 reach the value i 3T i, the instantaneous values of the currents ii and 12 are compared with the second current standard i 3T 2 (1 3 t2>1 3 t1), the number of phases of each line is fixed , in which the currents are greater than or equal to i 3T 2, if At>t 3T i, then turn off the line in which the current reached i 3Ti first and during t 3T 2 reaches i 3T 2, if At ⁇ t 3T i, and the current in one line is greater than or equal to i 3T 2, and in the other less than i 3T 2, then turn off the line in which the current is greater than or equal to i 3T 2, if during the time t 3T 2 after the currents in the first (second) line reach the value i 3T i, they reach the value i 3T 2, and the currents in the second (
  • the currents in the same phases of the lines of the second current standard are controlled, which makes it possible to increase the current amplitude at which the time standard t 3Ti will be determined. This increase, in turn, leads to a decrease in the value of t 3T i, and thus provides a higher protection sensitivity.
  • the figure 1 shows a device that implements a method for protecting two parallel lines.
  • Figure 2 shows the time At in the event of a short circuit on the busbars of the receiving substation.
  • Figure 3 shows the time At with a short circuit on the first line.
  • the method for protecting two parallel lines can be implemented using a device (Fig. 1), which contains current sensors 1 (DT1), 2 (DT2), blocks 3 (BS1) and 4 (BS2) for comparing the instantaneous values of the current as it rises with the first current standard i 3T i, connected to current sensors 1 (DT1) and 2 (DT2), blocks 5 (BSZ) and 6 (BS4) for comparing instantaneous current values when it increases with the second current standard i 3T 2, connected to current sensors 1 (DT1) and 2 (DT2), blocks 7 (BOV1) and 8 (BOV2) of the time count t 3T 2 connected to blocks 3 (BS1) and 4 (BS2), block 9 (FO1) fixing the sequence of reaching currents ii and 12 i 3Ti values with outputs 10, 11, connected to blocks 3 (BS1) and 4 (BS2), block 12 (FO2) fixing the order in which currents ii and 12 reach values i 3Ti with outputs 13, 14, connected to blocks 3 (BS1) and 4 (BS2), blocks 15 (BIV
  • Time At allows you to determine the short circuit on the lines or not. This can be easily seen by comparing the At time shown in FIG. 2 and FIG. 3.
  • the difference in the measured currents (Fig. 2) is due only to the influence of the errors of the current sensors and the device. Therefore, the time At is insignificant and tends to zero with decreasing errors.
  • a short circuit on the lines for example, on the first one (Fig. 3), q>12, therefore ii reaches the value i 3Ti earlier than 12.
  • At increases significantly, and if it exceeds t 3T i, then the presence of damage on the lines is fixed.
  • the time t 3Ti is determined when flowing in current lines with an amplitude equal to i 3T 2, assuming that the currents are sinusoidal, and taking into account the influence of errors si and £2 of the current sensors and the device, according to the formula: where ti and t2 are the time from the moment the sinusoid passes through zero until the currents in the first and second lines reach the value i 3Ti ; k ots - detuning factor, taking into account calculation errors; w is the angular frequency.
  • the current value i 3T 2 must satisfy two conditions:
  • expression (1) will take the form: arc sin - - - - - - arcsinO, 5 2- (1- g )
  • the value of the zone / vd of the cascade action of protection in fractions of the length of the lines can be determined using the Mathcad program from the expression: where I is the amplitude value of the maximum current of a three-phase short circuit on the buses of the receiving substation; x - share / vd of the entire length of the line.
  • blocks 9 (FO1) and 12 (FO2) of fixing the order in which the currents ii and 12 reach the value i 3Ti determine that the current ii reached the value i 3Ti first
  • block 7 (BOV1) starts counting the time t 3T 2
  • block 15 (BIV1 ) measuring the time At and comparing it with the time standard t 3Ti
  • blocking block 16 (BIV2) measuring the time At and comparing it with the time standard t 3T i.
  • the time At which he measured, is equal to:
  • block 15 (BIV1) outputs a signal to the input of logic block 19 (BL1).
  • block 5 (BSZ) outputs signals to the inputs of the logic block 19 (BL1), which is triggered and delivers a signal through the OR element 21 (OR1) to the trip circuit of the first line circuit breaker.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention se rapporte à la production d'énergie électrique, concerne notamment des techniques de protection par relais, et peut être utilisée afin de protéger des lignes parallèles contre les courts-circuits. Le résultat technique consiste en une augmentation de la sensibilité de protection. Ce résultat est atteint grâce à un procédé de protection de deux lignes parallèles dans lequel: on décompte le temps tЭT2 une fois que des valeurs instantanées ont atteint des courants i1 ou i2 d'une valeur iЭT1; on compare les valeurs instantanées des courants i1 et i2 à une seconde référence de courant ίЭT2 (ΐЭT2>ΐЭT1); on détermine le nombre de phases de chaque ligne dans lesquelles les courants sont supérieurs ou égaux à iЭT2; si At≥tЭT1, on coupe la ligne dans laquelle le courant a atteint iЭT1 en premier et pendant tЭT2 a atteint iЭT2; si At<tЭT1 et si le courant dans une des lignes est supérieur ou égal à iЭT2 tandis que dans l'autre il est inférieur à iЭT2, on coupe la ligne dans laquelle il est supérieur ou égal à iЭT2; si pendant un temps tЭT2, après que les courants ont atteint, dans la première (seconde) ligne une valeur iЭT1, ils atteignent une valeur iЭT2 tandis que les courants dans la seconde (première) ligne n'atteignent pas iЭT1, alors on couple la première (seconde) ligne.
PCT/KZ2021/000019 2021-08-17 2021-08-17 Procédé de protection de deux lignes parallèles WO2023022580A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KZ2021/000019 WO2023022580A1 (fr) 2021-08-17 2021-08-17 Procédé de protection de deux lignes parallèles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KZ2021/000019 WO2023022580A1 (fr) 2021-08-17 2021-08-17 Procédé de protection de deux lignes parallèles

Publications (1)

Publication Number Publication Date
WO2023022580A1 true WO2023022580A1 (fr) 2023-02-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KZ2021/000019 WO2023022580A1 (fr) 2021-08-17 2021-08-17 Procédé de protection de deux lignes parallèles

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Country Link
WO (1) WO2023022580A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724597A2 (fr) * 2005-05-17 2006-11-22 ABB Oy Procédé et dispositif pour localiser un défaut à la terre
EP2514059B1 (fr) * 2009-12-16 2016-06-15 Siemens Aktiengesellschaft Protection de lignes parallèles d'un réseau d'alimentation en énergie électrique
RU2631679C1 (ru) * 2016-09-12 2017-09-26 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Способ защиты параллельных линий
RU2640353C1 (ru) * 2016-09-12 2017-12-28 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Способ защиты с приемной стороны двух параллельных линий с односторонним питанием

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724597A2 (fr) * 2005-05-17 2006-11-22 ABB Oy Procédé et dispositif pour localiser un défaut à la terre
EP2514059B1 (fr) * 2009-12-16 2016-06-15 Siemens Aktiengesellschaft Protection de lignes parallèles d'un réseau d'alimentation en énergie électrique
RU2631679C1 (ru) * 2016-09-12 2017-09-26 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Способ защиты параллельных линий
RU2640353C1 (ru) * 2016-09-12 2017-12-28 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Способ защиты с приемной стороны двух параллельных линий с односторонним питанием

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