WO2011113199A1 - Procédé de protection de distance phase-phase pour éviter un dysfonctionnement durant une surcharge - Google Patents

Procédé de protection de distance phase-phase pour éviter un dysfonctionnement durant une surcharge Download PDF

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Publication number
WO2011113199A1
WO2011113199A1 PCT/CN2010/071104 CN2010071104W WO2011113199A1 WO 2011113199 A1 WO2011113199 A1 WO 2011113199A1 CN 2010071104 W CN2010071104 W CN 2010071104W WO 2011113199 A1 WO2011113199 A1 WO 2011113199A1
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WO
WIPO (PCT)
Prior art keywords
phase
distance
overload
relay
protection
Prior art date
Application number
PCT/CN2010/071104
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English (en)
Chinese (zh)
Inventor
沈国荣
李九虎
李力
朱晓彤
赵青春
李园园
沈军
Original Assignee
南京南瑞继保电气有限公司
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 南京南瑞继保电气有限公司 filed Critical 南京南瑞继保电气有限公司
Priority to PCT/CN2010/071104 priority Critical patent/WO2011113199A1/fr
Publication of WO2011113199A1 publication Critical patent/WO2011113199A1/fr

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Classifications

    • 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
    • H02H3/38—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 both voltage and current; responsive to phase angle between voltage and current

Definitions

  • the present invention relates to a solution for overloading an interphase distance protection malfunction and an apparatus using the same. Background technique
  • the AC interconnection of the large power grid and the increase of the transmission capacity of the EHV line make the line overload situation especially prominent, especially in the case of two large system tie lines (assuming the N return line), in the case of system failure, a line retreat, the failure
  • the line load transfer, the operation of the tie line forms an accident overload, and the distance III component in the distance protection may operate to cut off the line without failure, and cause a large-scale blackout.
  • the existing overload solution generally starts from the distance protection action characteristic, does not change the original distance relay setting principle, and only increases the grounding and phase load limiting relay.
  • the load limit relay measures the measured impedance that can occur in the event of an accidental overload. By setting the value to avoid action in this case, the performance of the distance component is guaranteed.
  • the load limit relay expression is as follows:
  • rj is the bus voltage and is the compensated line current. To set the resistance value, it is set by the user. Where is the positive sequence impedance angle of the line.
  • the load limit relay is calculated according to the most serious accident overload condition, which deteriorates the performance of the distance relay and weakens the advantage of being a backup protection.
  • the technical solution adopted by the present invention is as follows:
  • the overload generally only affects the distance III component, and therefore the limiting condition is added to the III phase-to-phase distance relay.
  • This restriction condition ensures that it is not open when the load is overloaded and is reliably opened in the event of a fault.
  • ⁇ cos ⁇ happens to reflect the phase-to-phase voltage of the oscillation center; when the phase is short-circuited, ⁇ is the voltage drop across the arc resistance, and the phase-to-phase short-circuit transition resistance is the arc resistance, the arc resistance
  • the upper pressure drop is less than 5% ⁇ .
  • a method for preventing inter-phase distance protection against overload misoperation which is characterized by: For a phase III distance relay, the arc voltage characteristic during phase-to-phase fault is used to increase the constraint condition:
  • Equation (3) ⁇ is the modulus of the voltage between the bus phases, and ⁇ is the angle between the phase-to-phase voltage and the phase-to-phase current.
  • k 5 Consider the maximum calculation error at fault, generally Take a negative value, the recommended value range is 0.2 0.1, and the better value range is 0.25 ⁇ 0.15, which is less than the minimum ⁇ standard value under accidental overload. The recommended value is 0.4 ⁇ 0.6. A typical value is 0.5.
  • the restriction condition is open, and the corresponding phase-to-phase distance III-segment relay is opened; the restriction condition is not open, and the interlocking corresponds to the phase-to-phase distance III-segment relay.
  • the technical solution of the present invention makes full use of the information of the positive sequence component on the line, and since the positive sequence component can basically reflect the load condition, the state of the fault and the load can be well distinguished. Different measures can be taken for the load and fault conditions, and different measures can be taken for the fault phase and the non-fault phase to avoid the impact on the performance of the protection while solving the overload problem.
  • the beneficial effects of the present invention are: by adding restrictions to the interphase distance III segment relay, It is enough to ensure the action performance of the phase III distance protection under the condition of overload and overload and fault, avoid the misoperation caused by the overload, and prevent the overload from causing the distance protection to expand before the safety automatic device action. On the other hand, this criterion in turn can cause phase-to-phase short-circuit faults in the sensitive reaction system.
  • the invention is simple and easy to implement, and can improve the reliability of the interphase distance m-segment relay without lowering the protection sensitivity.
  • Fig. 2 is a logic diagram for increasing the distance in segment element after adding the restriction condition of the embodiment of the present invention.
  • Phase III distance Refers to the phase-to-phase distance in the device.
  • Interphase distance limitation condition Refers to the logic output after the input condition of Fig. 2 is satisfied.
  • the three-phase voltage and the three-phase current of the collected protection installation are processed by filtering, Fourier transform and the like, and the variables required in the specific embodiment of the present invention are formed according to the calculation method given above: Interphase ⁇ 08 ⁇ standard Value is equivalent.
  • the limiting condition is the same as the phase III distance relay, and the phase III distance delay is determined by the phase distance relay.
  • phase-to-phase distance limit condition When the phase-to-phase distance limit condition is open, and the phase III phase-to-phase distance relay action equation is satisfied, the action is tripped after the third-phase phase-to-phase distance delay t2.
  • phase-to-phase distance III-segment relay This solution makes full use of the characteristics of arc voltage between phase-to-phase faults, which can perfectly distinguish between load and fault conditions, and will not open under overload conditions. At the same time, the solution is simple and easy to implement, which is beneficial to improve the reliability of the protection action.
  • phase III distance relay Under the light load or normal load condition, the system has a phase-to-phase short-circuit fault, ⁇ ⁇ directly reflects the phase-to-phase arc voltage drop at the fault point, and the supplementary criterion is reliable and open.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention porte sur un procédé de protection de distance phase-phase pour éviter un dysfonctionnement durant une surcharge. Pour un relais de protection de distance phase-phase à trois étages, une condition limitante est ajoutée sous la forme : formule (1), dans laquelle : est la valeur de module de tension phase-phase de bus au niveau d'une position d'installation de protection, est l'angle entre une tension phase-phase au niveau de la position d'installation de protection et un courant phase-phase de ligne au niveau de la position d'installation de protection, est le réglage d'erreur de calcul maximal lorsqu'on considère des défauts, dont l'intervalle de valeurs est -0,25~-0,1, et est le réglage de valeur de cos par unité minimal dans des conditions de surcharge inférieure au défaut, dont l'intervalle de valeurs est 0,4~0,6. Lorsque la formule (1) est satisfaite, le relais est débloqué, sinon le relais est bloqué. La présente invention peut garantir que le relais de protection de distance phase-phase à trois étages met en œuvre de façon dynamique une protection de distance dans des conditions de surcharge et de nouveau défaut de surcharge, et peut éviter le dysfonctionnement de protection de distance dû à une surcharge.
PCT/CN2010/071104 2010-03-17 2010-03-17 Procédé de protection de distance phase-phase pour éviter un dysfonctionnement durant une surcharge WO2011113199A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2010/071104 WO2011113199A1 (fr) 2010-03-17 2010-03-17 Procédé de protection de distance phase-phase pour éviter un dysfonctionnement durant une surcharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2010/071104 WO2011113199A1 (fr) 2010-03-17 2010-03-17 Procédé de protection de distance phase-phase pour éviter un dysfonctionnement durant une surcharge

Publications (1)

Publication Number Publication Date
WO2011113199A1 true WO2011113199A1 (fr) 2011-09-22

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WO (1) WO2011113199A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283196A (zh) * 2014-10-15 2015-01-14 国家电网公司 一种确定过负荷与相间故障识别判据高限系数的方法
CN104332965A (zh) * 2014-10-15 2015-02-04 国家电网公司 一种确定单相接地故障识别高限系数的方法
CN105119254A (zh) * 2015-09-22 2015-12-02 昆明理工大学 一种降低交直流串联系统中距离保护误动率的三相重合时序整定方法
CN105375447A (zh) * 2015-09-22 2016-03-02 昆明理工大学 一种降低交直流系统中距离保护误动率的三相重合时序整定方法

Citations (5)

* Cited by examiner, † Cited by third party
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JPH0746745A (ja) * 1993-08-04 1995-02-14 Meidensha Corp ディジタル型保護継電器
EP1804357A1 (fr) * 2002-01-28 2007-07-04 Kabushiki Kaisha Toshiba Relais directionnel numérique
CN101227085A (zh) * 2008-01-02 2008-07-23 朱声石 确保距离保护后备段不受过负荷影响的方法
CN101291056A (zh) * 2007-04-17 2008-10-22 上海申瑞电力科技股份有限公司 一种长线模型故障选相方法
CN101710696A (zh) * 2009-12-03 2010-05-19 华中电网有限公司 过负荷时线路保护防误动解决方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0746745A (ja) * 1993-08-04 1995-02-14 Meidensha Corp ディジタル型保護継電器
EP1804357A1 (fr) * 2002-01-28 2007-07-04 Kabushiki Kaisha Toshiba Relais directionnel numérique
CN101291056A (zh) * 2007-04-17 2008-10-22 上海申瑞电力科技股份有限公司 一种长线模型故障选相方法
CN101227085A (zh) * 2008-01-02 2008-07-23 朱声石 确保距离保护后备段不受过负荷影响的方法
CN101710696A (zh) * 2009-12-03 2010-05-19 华中电网有限公司 过负荷时线路保护防误动解决方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283196A (zh) * 2014-10-15 2015-01-14 国家电网公司 一种确定过负荷与相间故障识别判据高限系数的方法
CN104332965A (zh) * 2014-10-15 2015-02-04 国家电网公司 一种确定单相接地故障识别高限系数的方法
CN104283196B (zh) * 2014-10-15 2017-07-14 国家电网公司 一种确定过负荷与相间故障识别判据高限系数的方法
CN105119254A (zh) * 2015-09-22 2015-12-02 昆明理工大学 一种降低交直流串联系统中距离保护误动率的三相重合时序整定方法
CN105375447A (zh) * 2015-09-22 2016-03-02 昆明理工大学 一种降低交直流系统中距离保护误动率的三相重合时序整定方法
CN105119254B (zh) * 2015-09-22 2018-03-06 昆明理工大学 一种降低交直流串联系统中距离保护误动率的三相重合时序整定方法
CN105375447B (zh) * 2015-09-22 2018-07-24 昆明理工大学 一种降低交直流系统中距离保护误动率的三相重合时序整定方法

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