WO2005078886A1 - Procede de restriction de courant homopolaire pour la protection differentielle de transformateur d'energie - Google Patents

Procede de restriction de courant homopolaire pour la protection differentielle de transformateur d'energie Download PDF

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Publication number
WO2005078886A1
WO2005078886A1 PCT/CN2005/000194 CN2005000194W WO2005078886A1 WO 2005078886 A1 WO2005078886 A1 WO 2005078886A1 CN 2005000194 W CN2005000194 W CN 2005000194W WO 2005078886 A1 WO2005078886 A1 WO 2005078886A1
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WO
WIPO (PCT)
Prior art keywords
zero
current
transformer
differential protection
phase
Prior art date
Application number
PCT/CN2005/000194
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English (en)
Chinese (zh)
Inventor
Xidong Xu
Original Assignee
Zhejiang University
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
Priority claimed from CNB2004100163113A external-priority patent/CN100367600C/zh
Priority claimed from CNB2004100163128A external-priority patent/CN100413169C/zh
Priority claimed from CNB2004100163058A external-priority patent/CN100388581C/zh
Application filed by Zhejiang University filed Critical Zhejiang University
Publication of WO2005078886A1 publication Critical patent/WO2005078886A1/fr

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Classifications

    • 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
    • H02H7/04—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 for transformers
    • H02H7/045—Differential protection of transformers

Definitions

  • the invention belongs to the differential protection of a transformer, and in particular relates to a zero-sequence current braking method for the differential protection of a transformer. Background technique
  • the longitudinal differential protection of power transformers currently used consists of two parts: differential quick-break and ratio differential.
  • the power transformer is composed of A, B, and C three phases.
  • Figure 1 is a one-phase protection block diagram. From Figure 1, it can be seen that ratio differential consists of ratio braking, exciting inrush current detection, and overexcitation detection unit.
  • the output of the detection unit is connected to the AND gate after the inverter, and the output of the ratio braking is braked.
  • Figure 2 The longitudinal difference protection uses a current transformer pair Y.
  • the three-phase current on the side (that is, the transformer star connection side where the neutral point is directly grounded) is ⁇ / ⁇ transformed to eliminate the effect of the zero-sequence current. After the transformation, each current no longer contains the zero-sequence component of the primary current.
  • the currents flowing in the three differential coils Wd are A, B, and C three-phase differential currents; Phase currents are combined in other ways to obtain three-phase braking currents, such as: Wresl ⁇ Wres3 are the braking coils on each side, and the maximum current in the three braking coils of the same phase is taken as the braking current; The current in each brake coil is weighted and summed to obtain the braking current of this phase. The braking current thus obtained can only represent the magnitude of the through current.
  • transformer differential protection is Y.
  • the side current transformer is all-star wiring
  • the Yc side three-phase secondary current is ⁇ / ⁇ transformed in the protection device, or the Y Q side three-phase secondary current is subtracted from the zero-sequence current.
  • ⁇ / ⁇ conversion is performed on the secondary current on the ⁇ side, thereby eliminating the influence of the zero-sequence current. It can be seen that after these transformations and the balance of each side adjustment, the differential current obtained by adding the same name and the braking current obtained by other combinations also do not include the zero-sequence component of the primary current, and can only represent the magnitude of the passing current. .
  • the problem is: When the transformer has an external ground fault on the Y Q side and only that side has power, a large zero sequence fault current will appear on the Y Q side, but the fault current does not pass through the transformer. If Y Q-side three-phase current transformer mass becomes inconsistent error, in a three-phase current transformer after converting the three-phase side zero sequence current equal to, not equal to the secondary current, the above-described conventional three-phase current side converting Y Q The method cannot completely eliminate the influence of the zero-sequence current, and will generate an unbalanced current in the differential circuit. Because no fault current flows through the transformer at this time, the braking current obtained by the traditional method is very small and will not exceed the braking current before the fault.
  • the technical problem to be solved by the present invention is directed to the problems existing in the prior art transformer differential protection technology.
  • the three-phase current conversion method cannot completely eliminate the influence of the zero-sequence current, and provides a zero-sequence current braking method for transformer differential protection.
  • the principle is to use a phase differential current in the transformer longitudinal differential protection and the zero sequence current on the Yc side of the transformer to constitute the phase zero sequence ratio braking unit.
  • the ratio value is less than the setting value K, the phase braking signal is output, and the corresponding phase is output.
  • Proportional differential protection applies braking.
  • This zero-sequence current braking method for transformer differential protection is characterized in that: a phase differential current and a Yo-side zero-sequence current in the transformer longitudinal differential protection are used to constitute a phase zero-sequence ratio braking unit.
  • the phase braking signal is output to brake the corresponding phase-ratio differential protection unit; the zero-sequence braking is based on the following relationship:
  • I dx is any phase differential current of the transformer differential protection differential current (I da , I db , I de ), and (3 1) is Y.
  • the side zero-sequence current that is, the sum of the three-phase currents on the side; In the case where the zero-sequence current and the three-phase differential current are reduced to the same side, the range of the setting value K is:
  • 3 1. (3I 10 , 3I 20 , 3I no ) max
  • 3I 1 () , 3I 2 ... 3I nQ ) are each Y.
  • the zero-sequence current on the side (3I 1 () , 3I 2 ..., 3I no ) max is the maximum value of the zero-sequence current on each Y Q side.
  • 3 I. 3I 10 Xk 10 + 3I 20 Xk 20 + ⁇ ⁇ + 3I no X k n0
  • the zero sequence current (3I 1 (), 3 ⁇ 20 , ⁇ ⁇ 3 ⁇ ⁇ ) Y Q for the side, (k 1Q, k 20, ising k n0) is the weight value set in advance
  • (3I 1 () Xk 1 () + 3I 20 Xk 20 + whil + 3I no X k n0 ) is the weighted sum of the zero-sequence currents at each Y 0 side.
  • the zero-sequence current braking method for transformer differential protection of the present invention adds a zero-sequence braking unit on the basis of traditional transformer longitudinal differential protection to form a single-phase zero-sequence ratio braking system.
  • the ratio value is smaller than the setting value ⁇
  • the phase braking signal is output to brake the corresponding phase ratio differential protection.
  • the outstanding effect of this method is that it can completely avoid the misoperation of the transformer longitudinal differential protection caused by the external ground fault in the Y Q side zone when the errors of the three-phase current transformers are inconsistent; it can also prevent the zero-sequence current caused by other non-internal fault conditions.
  • the differential protection of transformer caused by the differential unbalanced current does not work properly, and it does not affect the correct operation of the differential protection in the case of a fault in the area.
  • Figure 1 is a principle block diagram of a transformer longitudinal differential protection device based on the existing method.
  • Figure 2 is the wiring diagram of the transformer longitudinal differential protection device based on the existing method.
  • FIG. 3 is a circuit block diagram of a braking unit according to an embodiment of the method of the present invention.
  • FIG. 4 is a circuit block diagram of a braking unit of the method of the present invention under multiple Y Q side conditions.
  • FIG. 5 is a circuit block diagram of a second embodiment of a braking unit of the method of the present invention under multiple Y Q side conditions. detailed description
  • FIG. 3 provides a circuit device of a zero-sequence current braking unit for transformer differential protection.
  • This device is composed of filters 11 to 13, filter 01, multiplier 2, and comparators 31 to 33, where the inputs of the filters 11 to 13 are respectively input
  • the three-phase differential current signals i da , i db , i dco formed by the transformer longitudinal differential protection are the three-phase differential current instantaneous voltage drops caused by the current flowing through the three Wd in Figure 2.
  • the input of the filter 01 is input to the transformer Y. Side zero sequence current instantaneous value signal 3i.
  • the output terminal is connected to one input terminal of multiplier 2, the other input terminal of multiplier 2 inputs the setting value K, the negative input terminals of comparators 31 to 33 are connected to the output terminals of multiplier 2, and its positive input terminals are respectively Connected to the output terminals of the filters 11 ⁇ 13, the comparators 31 ⁇ 33 output the braking signals of phase A, B and C respectively.
  • the braking signals are directly connected to the AND gate inputs of the differential parts of the comparison ratios, that is, they are connected from part A in Figure 1, and participate in the contrast ratio together with the inrush current and the reverse signal output from the over-excitation detection unit.
  • the output signal of the braking unit is used for braking.
  • the comparator When the positive input signal in the comparators 31 to 33 is less than the negative input signal, the comparator outputs 0 (low potential) and outputs the corresponding phase braking signal to brake the corresponding phase ratio differential protection to prevent the transformer differential protection. Misoperation; otherwise the comparator output 1 (high potential) allows the corresponding ratio differential protection action.
  • the setting value K is 0.1.
  • Fig. 4 shows another embodiment for implementing zero sequence braking.
  • the device is composed of filters 01, 02, 03, filters 11 to 13, a maximum value calculating circuit 4, a multiplier 2, and a comparator 31 to 33, wherein the input terminals of the filters 01, 02, and 03 are respectively input to each of the transformers.
  • the zero-sequence current instantaneous value signals 3i 1Q and 3i 20 3i 3Q of the ground point (or branch) of the neutral point are connected to the input terminal of the maximum-calculation circuit 4 respectively, and one input terminal of the multiplier 2 is connected to the maximum value.
  • the output of circuit 4 has the other input to set value K.
  • the negative input of comparators 31 to 33 is connected to the output of multiplier 2.
  • the inputs of filters 11 to 13 are input from the transformer differential protection.
  • the instantaneous value signals of three-phase differential currents i da , i db , i dc are connected to the positive input terminals of comparators 31 to 33 respectively, and the comparators 31 to 33 respectively output the phases A, B, and C. Action signal.
  • the comparator When the positive input signal in the comparators 31 ⁇ 33 is less than the negative input signal, the comparator outputs 0 and outputs the corresponding phase braking signal to brake the corresponding phase ratio differential protection to prevent the transformer differential protection from malfunctioning; otherwise Comparator output 1 allows corresponding ratio differential protection action.
  • the setting value K is 0.1.
  • FIG. 5 shows still another embodiment of the zero-sequence braking method.
  • the device of the embodiment is composed of filters 01, 02, 03, multipliers 41, 42, 43, adder 5, multiplier 2, filters 11 to 13, and comparators 31 to 33, of which filters 01, 02, and 03
  • the input terminals input the instantaneous zero-sequence current signals 3i 1Q and 3i 2 of the neutral side (or branch) of each transformer.
  • the outputs of filters 11 to 13 are compared with The positive input terminals of the comparators 31 to 33 are connected to each other, and the comparators 31 to 33 output brake signals of phase A, phase B, and phase C, respectively.
  • the setting value K is 0.1.
  • the comparator When the positive input signal in the comparators 31 to 33 is less than the negative input signal, the comparator outputs 0 and outputs the corresponding phase braking signal to brake the corresponding phase ratio differential protection to prevent the transformer differential protection from malfunctioning; otherwise Comparator output 1 allows corresponding ratio differential protection action.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Transformers (AREA)

Abstract

La présente invention a trait à une solution technique améliorée pour la protection différentielle de transformateur. Une unité de ralentissement de rapport de phase homopolaire est formée en utilisant un courant différentiel de phase dans la protection différentielle longitudinale de transformateur et le courant homopolaire dans la section Y0 du transformateur, le signal de ralentissement de phase est émis en sortie de sorte que l'unité différentielle de rapport de phase correspondant de protection différentielle longitudinale de transformateur est ralentie lorsque la valeur de rapport est inférieure à la valeur de correction K. Cela peut empêcher le dysfonctionnement de la protection différentielle longitudinale de transformateur provoqué par une faute de masse hors de la zone de section Y0, tandis que le fonctionnement normal de protection différentielle longitudinale dans la zone sous la faute n'est pas affectée. La solution de l'invention convient à la protection différentielle longitudinale de transformateur d'énergie.
PCT/CN2005/000194 2004-02-13 2005-02-16 Procede de restriction de courant homopolaire pour la protection differentielle de transformateur d'energie WO2005078886A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CNB2004100163113A CN100367600C (zh) 2004-02-13 2004-02-13 防止多分支变压器差动保护误动的分相综合零序制动方法
CNB2004100163128A CN100413169C (zh) 2004-02-13 2004-02-13 防止多分支变压器差动保护误动的分相零序制动方法
CN200410016312.8 2004-02-13
CN200410016305.8 2004-02-13
CNB2004100163058A CN100388581C (zh) 2004-02-13 2004-02-13 防止变压器差动保护误动的分相差流方法
CN200410016311.3 2004-02-13

Publications (1)

Publication Number Publication Date
WO2005078886A1 true WO2005078886A1 (fr) 2005-08-25

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7873496B2 (en) 2005-12-09 2011-01-18 Abb Technology Ltd. Method and device for fault detection in an N-winding three-phase power transformer
CN104701813A (zh) * 2015-03-13 2015-06-10 国家电网公司 YNd5接线变压器纵联差动保护电流相位补偿方法
RU2597243C1 (ru) * 2015-09-01 2016-09-10 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Способ построения и настройки дифференциально-фазной релейной защиты
CN108023338A (zh) * 2017-11-28 2018-05-11 国网浙江省电力公司台州供电公司 用于多端t接输电线路的差动保护的判断方法
RU2662725C1 (ru) * 2017-06-07 2018-07-30 Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Новосибирский Государственный Технический Университет" Способ дифференциальной защиты силового трансформатора от витковых замыканий
CN113270856A (zh) * 2021-05-07 2021-08-17 国网河南省电力公司电力科学研究院 一种基于电流过零点进行同步的线路纵联差动保护方法
CN113488964A (zh) * 2021-07-27 2021-10-08 西安热工研究院有限公司 电气量保护高速永磁风力发电机、出线电缆的系统及方法
RU2785756C1 (ru) * 2022-02-28 2022-12-12 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный аграрный университет имени И.Т. Трубилина" Устройство для защиты комплектного токопровода от коротких замыканий

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Publication number Priority date Publication date Assignee Title
CN1047887A (zh) * 1989-06-07 1990-12-19 德鲁化学公司 从矿石中回收贵重金属
CN1402900A (zh) * 1999-11-29 2003-03-12 施魏策尔工程实验公司 用于电力变压器差动保护的系统
CN1402400A (zh) * 2002-08-26 2003-03-12 南京南瑞继保电气有限公司 变斜率的比率差动保护方法
CN1419327A (zh) * 2002-10-24 2003-05-21 南京南瑞继保电气有限公司 发电机工频变化量比率差动保护方法

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN1047887A (zh) * 1989-06-07 1990-12-19 德鲁化学公司 从矿石中回收贵重金属
CN1402900A (zh) * 1999-11-29 2003-03-12 施魏策尔工程实验公司 用于电力变压器差动保护的系统
CN1402400A (zh) * 2002-08-26 2003-03-12 南京南瑞继保电气有限公司 变斜率的比率差动保护方法
CN1419327A (zh) * 2002-10-24 2003-05-21 南京南瑞继保电气有限公司 发电机工频变化量比率差动保护方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7873496B2 (en) 2005-12-09 2011-01-18 Abb Technology Ltd. Method and device for fault detection in an N-winding three-phase power transformer
CN104701813A (zh) * 2015-03-13 2015-06-10 国家电网公司 YNd5接线变压器纵联差动保护电流相位补偿方法
RU2597243C1 (ru) * 2015-09-01 2016-09-10 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Способ построения и настройки дифференциально-фазной релейной защиты
RU2662725C1 (ru) * 2017-06-07 2018-07-30 Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования "Новосибирский Государственный Технический Университет" Способ дифференциальной защиты силового трансформатора от витковых замыканий
CN108023338A (zh) * 2017-11-28 2018-05-11 国网浙江省电力公司台州供电公司 用于多端t接输电线路的差动保护的判断方法
US11764568B2 (en) 2017-11-28 2023-09-19 Taizhou Power Supply Company Of State Grid Zhejiang Electric Power Differential protection determination method
CN113270856A (zh) * 2021-05-07 2021-08-17 国网河南省电力公司电力科学研究院 一种基于电流过零点进行同步的线路纵联差动保护方法
CN113270856B (zh) * 2021-05-07 2022-07-26 国网河南省电力公司电力科学研究院 一种基于电流过零点进行同步的线路纵联差动保护方法
CN113488964A (zh) * 2021-07-27 2021-10-08 西安热工研究院有限公司 电气量保护高速永磁风力发电机、出线电缆的系统及方法
RU2785756C1 (ru) * 2022-02-28 2022-12-12 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный аграрный университет имени И.Т. Трубилина" Устройство для защиты комплектного токопровода от коротких замыканий

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