WO2019144580A1 - Procédé de protection contre les surcharges de transformateur basé sur un disjoncteur électronique intelligent basse tension - Google Patents

Procédé de protection contre les surcharges de transformateur basé sur un disjoncteur électronique intelligent basse tension Download PDF

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Publication number
WO2019144580A1
WO2019144580A1 PCT/CN2018/095929 CN2018095929W WO2019144580A1 WO 2019144580 A1 WO2019144580 A1 WO 2019144580A1 CN 2018095929 W CN2018095929 W CN 2018095929W WO 2019144580 A1 WO2019144580 A1 WO 2019144580A1
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WIPO (PCT)
Prior art keywords
current
transformer
load current
circuit breaker
overload
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PCT/CN2018/095929
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English (en)
Chinese (zh)
Inventor
梁生
张俊忠
王国萱
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广东中鹏电气有限公司
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Publication of WO2019144580A1 publication Critical patent/WO2019144580A1/fr

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    • 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
    • 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
    • H02H3/08—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 excess current
    • H02H3/093—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 excess current with timing means

Definitions

  • the invention relates to the technical field of power transmission and distribution, and more particularly to a transformer overload protection method based on an electronic intelligent low voltage circuit breaker.
  • the application of low-voltage circuit breakers in the distribution system to cut off the transformer is an important and reliable method for the power system to achieve self-protection and power quality control.
  • the targeted, reasonable and effective automatic control of the breaking action of the low-voltage circuit breaker is directly related to the operation efficiency and safety of the power system; on the other hand, in order to cope with the frequent overload of the transformer commonly existing in the distribution network.
  • the phenomenon of operation puts forward a higher demand for the overload protection of the transformer. It is necessary to protect the transformer from unacceptable overload conditions, and to ensure that the transformer is correctly and reliably removed in the network, which puts more demands on the function and application of the low-voltage protection circuit breaker.
  • the conventional low-voltage circuit breaker only sets the maximum load current limit, and the transformer is cut off when the transformer load current is greater than the maximum load current limit; the protection method does not consider the influence of the overload current duration on the transformer, so It may cause misjudgment to the actual state of the transformer. On the one hand, it may cause misjudgment to the load current overload rate but short duration, and there is no actual impact on the transformer. On the other hand, the load current overload rate may be low but the duration is long. The hazard is neglected, and it is difficult to truly realize the intelligent protection of transformer overload. Therefore, it is urgent to design a transformer overload protection method based on electronic intelligent low-voltage circuit breaker, which can prevent the transformer from being damaged by unacceptable overload state, and ensure the correct and reliable removal of the transformer in the network.
  • the object of the present invention is to overcome the shortcomings and deficiencies in the prior art, and to provide a transformer overload protection method based on an electronic intelligent low voltage circuit breaker, which can prevent the transformer from being subjected to unacceptable overload state damage and ensure The correct and reliable removal of the transformer in the net.
  • a transformer overload protection method based on an electronic intelligent low voltage circuit breaker characterized in that a maximum allowable load current I max and an electronic intelligent low voltage circuit breaker are set.
  • the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max , or When the load current in the time period Y i continues to be greater than the corresponding overload current limit I i , the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby realizing transformer overload protection.
  • the invention adopts an electronic intelligent low-voltage circuit breaker to perform an over-current preset of an overload current limit and a sustainable delay time period of the transformer operating state in the distribution network, and the overload current limit has a long delay time period and an overload.
  • the current limit is large, the delay time period is short; the electronic intelligent low-voltage circuit breaker automatically cuts off the protected transformer when the magnitude and duration of the load current reaches a preset state, thereby avoiding overheating accident caused by transformer overload and avoiding The case where the transformer is mistakenly cut off due to an unreasonable judgment of the state of the transformer affects the power supply.
  • the first solution is that during the operation of the transformer, the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max set by the electronic intelligent low-voltage circuit breaker, or When the load current continuously exceeds the corresponding overload current limit I i in the delay time period Y i , the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby implementing transformer overload protection, which includes the following steps:
  • step A1 the electronic intelligent low-voltage circuit breaker monitors the transformer load current at the current time in real time
  • Step A2 comparing the current load current with the maximum allowable load current I max : if the current load current > maximum allowable load current I max , the electronic intelligent low-voltage circuit breaker performs the shutdown action to make the transformer from the power grid Cut off to achieve transformer overload protection;
  • the magnitude between the current load current and the respective overload current limit I i is compared: if the current load current > overload current limit I i , the current time value is accumulated to the overload current limit I i the cumulative time Z i; if the load current is the current time ⁇ I i overload current limit, the current limit overload accumulation time corresponding to Z i I i is cleared to zero;
  • the second solution is that during the operation of the transformer, the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max set by the electronic intelligent low-voltage circuit breaker, or When the load current continuously exceeds the corresponding overload current limit I i in the delay time period Y i , the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby implementing transformer overload protection, which includes the following steps:
  • step S1 the electronic intelligent low-voltage circuit breaker monitors the transformer load current at the current time in real time
  • Step S2 comparing the current load current and the maximum allowable load current I max : if the current load current > maximum allowable load current I max , the electronic intelligent low-voltage circuit breaker performs the shutdown action to make the transformer from the power grid Cut off to achieve transformer overload protection;
  • Step S3 finding a delay time period Y i corresponding to the current statistical limit value, and obtaining a root mean square value of the load current in the delay time period Y i to obtain an equivalent load current;
  • step S4 skip to step S1 to continue processing at the next moment.
  • the electronic intelligent low-voltage circuit breaker integrates the monitored transformer load current and time data to obtain an equivalent load current, and the equivalent load current in the delay time period Y i is greater than the corresponding overload current limit I i .
  • the transformer is protected from automatic cut-off, so as to avoid accidents caused by overload, and the transformer can be reasonably removed from the power grid. Since the load condition of the transformer is very complicated, the load current fluctuation often occurs. Therefore, the equivalent load current in the delay time period Y i is obtained by the integral method, and the overload condition is judged by the equivalent load current, so that the load current fluctuation can be avoided.
  • the overload situation has an impact.
  • the equivalent load current Pe is:
  • T j is the time value of each time period unit in the delay time period Y i
  • P j is the load current in the time period unit T j .
  • the overload current limit is set to three, which is beneficial to the electronic intelligent circuit breaker control program setting and is useful for judging the actual overload condition of the transformer.
  • the transformer load is delayed by 6 hours from 100% to 140%, delayed by 3 hours from 140% to 165%, and delayed by 165% to 190% for one hour, which can reasonably protect the transformer from overload.
  • the present invention has the following advantages and benefits:
  • the invention adopts an electronic intelligent low-voltage circuit breaker to perform an over-current preset of an overload current limit and a sustainable delay time period of the transformer operating state in the distribution network, and the overload current limit has a small delay time period and is overloaded.
  • the current limit has a short delay time period; the electronic intelligent low-voltage circuit breaker automatically cuts off the protected transformer when the magnitude and duration of the load current reaches a preset state, thereby avoiding accidents caused by overload and avoiding the cause The case where the transformer is unreasonably judged and the transformer is accidentally removed.
  • Figure 1 is a flow chart of the method of the present invention
  • FIG. 2 is a schematic view showing the connection of a transformer and an electronic intelligent circuit breaker in the method of the present invention
  • Figure 3 is a graph of time-phase load currents involved in the method of the present invention.
  • FIG. 5 is a graph of time-phase load currents involved in the method of the second embodiment.
  • the delay time is set corresponding to each Y i overload current limit value I i, Y 1> Y 2 >...>Y n ;
  • the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max , or the load current continues during the delay period Y i
  • the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby realizing transformer overload protection.
  • the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max , or the load current during the delay period Y i
  • the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby realizing transformer overload protection, which includes the following steps:
  • step A1 the electronic intelligent low-voltage circuit breaker monitors the transformer load current at the current time in real time
  • Step A2 comparing the current load current with the maximum allowable load current I max : if the current load current > maximum allowable load current I max , the electronic intelligent low-voltage circuit breaker performs the shutdown action to make the transformer from the power grid Cut off to achieve transformer overload protection;
  • the magnitude between the current load current and the respective overload current limit I i is compared: if the current load current > overload current limit I i , the current time value is accumulated to the overload current limit I i the cumulative time Z i; if the load current is the current time ⁇ I i overload current limit, the current limit overload accumulation time corresponding to Z i I i is cleared to zero;
  • the invention adopts an electronic intelligent low-voltage circuit breaker to perform an over-current preset of an overload current limit and a sustainable delay time period of the transformer operating state in the distribution network, and the overload current limit has a small delay time period and is overloaded.
  • the current limit has a short delay time period; the electronic intelligent low-voltage circuit breaker automatically cuts off the protected transformer when the magnitude and duration of the load current reaches a preset state, thereby avoiding accidents caused by overload and avoiding the cause The case where the transformer is unreasonably judged and the transformer is accidentally removed.
  • the overload current limit is set to three, which is beneficial to the electronic intelligent circuit breaker control program setting and is useful for judging the actual overload condition of the transformer.
  • the load current continuously exceeds the overload current limit of 100% ⁇ I within 6 hours of the delay period, or the load current continues to exceed the overload current limit of 140% ⁇ I within 3 hours of the delay period.
  • the load current continuously exceeds the overload current limit of 165% ⁇ I, and the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby realizing transformer overload protection.
  • the transformer load is delayed by 6 hours from 100% to 140%, delayed by 3 hours from 140% to 165%, and delayed by 165% to 190% for one hour, which can reasonably protect the transformer from overload.
  • the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max , or the load current continues to be greater than the corresponding overload current limit during the delay period Y i At the value I i , the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby realizing transformer overload protection.
  • the electronic intelligent low-voltage circuit breaker monitors the load current of the transformer in real time; when the load current is greater than the maximum allowable load current I max , or the load current during the delay period Y i
  • the electronic intelligent low-voltage circuit breaker performs the shutdown action to cut off the transformer from the power grid, thereby realizing transformer overload protection, which includes the following steps:
  • step S1 the electronic intelligent low-voltage circuit breaker monitors the transformer load current at the current time in real time
  • Step S2 comparing the current load current and the maximum allowable load current I max : if the current load current > maximum allowable load current I max , the electronic intelligent low-voltage circuit breaker performs the shutdown action to make the transformer from the power grid Cut off to achieve transformer overload protection;
  • Step S3 finding a delay time period Y i corresponding to the current statistical limit value, and obtaining a root mean square value of the load current in the delay time period Y i to obtain an equivalent load current;
  • T j is the time value of each time period unit in the delay time period Y i
  • P j is the load current in the time period unit T j ;
  • step S4 skip to step S1 to continue processing at the next moment.
  • the electronic intelligent low-voltage circuit breaker integrates the monitored transformer load current and time data to obtain an equivalent load current, and the equivalent load current in the delay time period Y i is greater than the corresponding overload current limit I i .
  • the transformer is protected from automatic cut-off, so as to avoid accidents caused by overload, and the transformer can be reasonably removed from the power grid. Since the load condition of the transformer is very complicated, the load current fluctuation often occurs. Therefore, the equivalent load current in the delay time period Y i is obtained by the integral method, and the overload condition is judged by the equivalent load current, and the load current fluctuation can be avoided.
  • the actual overload situation has an impact.
  • the maximum allowable load current I max :I max K max ⁇ I.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un procédé de protection contre les surcharges de transformateur basé sur un disjoncteur électronique intelligent basse tension. Le procédé se caractérise par le réglage du courant de charge maximal admissible Imax et par n limites de courant de surcharge Ii dans un disjoncteur électronique intelligent basse tension, avec i = 1, 2.., n, et I1 < I2 <... < In ; par le réglage des durées de retard Yi correspondant aux limites de courant de surcharge Ii, avec Y1 > Y2 >... > Yn ; pendant le processus de fonctionnement d'un transformateur, par l'obtention, par le disjoncteur électronique intelligent basse tension, d'un courant de charge du transformateur, au moyen d'une surveillance en temps réel ; et lorsque le courant de charge est supérieur au courant de charge maximal admissible Imax ou que le courant de charge est continuellement supérieur à la limite de courant de surcharge Ii correspondante pendant la durée de retard Yi, par l'exécution, par le disjoncteur électronique intelligent basse tension, d'une opération de mise hors tension pour isoler le transformateur d'un réseau électrique, ce qui permet une protection du transformateur contre les surcharges. Le procédé de protection contre les surcharges de transformateur peut empêcher l'endommagement irréparable d'un transformateur par un état de surcharge et peut également assurer un isolement correct, fiable et raisonnable du transformateur et d'un réseau.
PCT/CN2018/095929 2018-01-25 2018-07-17 Procédé de protection contre les surcharges de transformateur basé sur un disjoncteur électronique intelligent basse tension WO2019144580A1 (fr)

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CN201810071702.7 2018-01-25
CN201810071702.7A CN108199347A (zh) 2018-01-25 2018-01-25 基于电子智能低压断路器的变压器过载保护方法

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CN108199347A (zh) * 2018-01-25 2018-06-22 广东中鹏电气有限公司 基于电子智能低压断路器的变压器过载保护方法
DE102018211069B3 (de) 2018-07-05 2019-09-26 Phoenix Contact Gmbh & Co. Kg Geräteschutzschalter mit intelligenter Grenzwertermittlung
BE1026445B1 (de) * 2018-07-05 2020-02-04 Phoenix Contact Gmbh & Co Geräteschutzschalter mit intelligenter Grenzwertermittlung
CN110867829B (zh) * 2019-10-25 2022-04-19 广东电网有限责任公司 一种基于变压器允许过载能力保护的配变保护测控装置
CN111327021B (zh) * 2020-03-31 2022-04-19 广东中鹏电气有限公司 一种用于高过载变压器的过负荷保护方法
CN112158102B (zh) * 2020-09-04 2024-03-19 开沃新能源汽车集团股份有限公司 一种车载锂电池系统的峰值电流控制方法

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US5805395A (en) * 1996-12-13 1998-09-08 Abb Power T&D Company Inc. Half-cycle summation V/Hz relay for generator and transformer over-excitation protection
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CN102013662A (zh) * 2009-09-04 2011-04-13 山东卓尔电气有限公司 电力变压器保护器
CN201887435U (zh) * 2010-12-01 2011-06-29 河南省电力公司南阳供电公司 小型变压器自保装置
CN108199347A (zh) * 2018-01-25 2018-06-22 广东中鹏电气有限公司 基于电子智能低压断路器的变压器过载保护方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5805395A (en) * 1996-12-13 1998-09-08 Abb Power T&D Company Inc. Half-cycle summation V/Hz relay for generator and transformer over-excitation protection
CN102013662A (zh) * 2009-09-04 2011-04-13 山东卓尔电气有限公司 电力变压器保护器
CN101944718A (zh) * 2010-09-13 2011-01-12 中国恩菲工程技术有限公司 一种电炉变压器的过载保护装置
CN201887435U (zh) * 2010-12-01 2011-06-29 河南省电力公司南阳供电公司 小型变压器自保装置
CN108199347A (zh) * 2018-01-25 2018-06-22 广东中鹏电气有限公司 基于电子智能低压断路器的变压器过载保护方法

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