CN112332384B - 一种避免发电厂厂用系统误失电的方法 - Google Patents

一种避免发电厂厂用系统误失电的方法 Download PDF

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CN112332384B
CN112332384B CN202011158634.1A CN202011158634A CN112332384B CN 112332384 B CN112332384 B CN 112332384B CN 202011158634 A CN202011158634 A CN 202011158634A CN 112332384 B CN112332384 B CN 112332384B
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王团结
王美良
员文康
廖军林
张少鹏
何信林
牛利涛
雷阳
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Xian Thermal Power Research Institute Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/027Details with automatic disconnection after a predetermined time
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/266Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving switching on a spare supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/007Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems

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  • Power Engineering (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

本发明公开了一种避免发电厂厂用系统误失电的方法,包括以下步骤:对快切装置的逻辑进行修改,将零序过流保护I段、II段保护动作时间与闭锁快切信号延时时间进行配合,避免厂用进线开关下侧与厂用母线未发生接地时,零序过流保护I段动作不会造成快切装置闭锁,即当母线侧故障,则跳开厂用进线开关后闭锁快切,当厂用变压器分支侧故障,则跳开厂用进线开关后启动快切,避免厂用系统误失电,减少不必要的损失。

Description

一种避免发电厂厂用系统误失电的方法
技术领域
本发明属于电力调试和电力试验技术领域,涉及一种避免发电厂厂用系统误失电的方法。
背景技术
常规发电厂厂用系统由厂用工作电源和厂用备用电源及母线段所组成,厂用电源由厂用变压器提供,经厂用进线开关与母线相连,备用电源由备用变压器提供,经备用进线开关与母线相连。
当厂用工作电源失电时,由快切装置切换至厂用备用电源供电。但是当厂用变压器分支发生接地故障时,根据《DLT 1502-2016厂用电继电保护整定计算导则》中的要求,零序过流保护I段动作会闭锁快切,快切装置无法切换至厂用备用电源供电,造成全厂失电,对机组安全运行带来巨大安全隐患。
发明内容
本发明的目的在于克服上述现有技术的缺点,提供了一种避免发电厂厂用系统误失电的方法,该方法能够有效的避免厂用系统误失电,保证机组安全运行。
为达到上述目的,本发明所述的避免发电厂厂用系统误失电的方法包括以下步骤:
当厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线发生接地故障时,厂用变压器分支零序CT2采集到的二次绕组电流发生突变,变压器保护装置的零序过流保护I段动作,再进行延时后断开厂用进线开关,并发出闭锁快切动作指令,快切装置收到所述闭锁快切动作指令后进行延时后闭锁快切,此时由于厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线的故障仍然存在,变压器保护装置的零序过流保护II段在故障发生时进行延时后动作,快切装置的闭锁快切功能未开放,快切动作合入备用进线开关,厂用母线由备用变压器供电;
当厂用母线发生接地故障时,厂用变压器分支零序CT2采集到的二次绕组电流发生突变,变压器保护装置的零序过流保护I段动作,再进行延时后动作断开厂用进线开关,并发出闭锁快切动作指令,快切装置收到闭锁快切动作指令后进行延时后闭锁快切,此时由于厂用母线的故障点被隔离,厂用变压器分支零序CT2采集到二次绕组电流突变量消失,变压器保护装置的零序过流保护II段不动作,快切装置进行延时后执行闭锁快切功能。
变压器保护装置的零序过流保护I段动作时间与闭锁快切延时之和大于零序II段保护的动作时间。
本发明具有以下有益效果:
本发明所述的避免发电厂厂用系统误失电的方法在具体操作时,对快切装置的逻辑进行修改,将零序过流保护I段、II段保护动作时间与闭锁快切信号延时时间进行配合,避免厂用进线开关下侧与厂用母线未发生接地时,零序过流保护I段动作,不会造成快切装置闭锁,即当母线侧故障,则跳开厂用进线开关后闭锁快切,当厂用变压器分支侧故障,则跳开厂用进线开关后启动快切,避免厂用系统误失电,减少不必要的损失,操作方便、简单。
附图说明
图1为发电厂厂用系统的结构示意图;
图2为本发明的流程图。
其中,1为厂用变压器、2为厂用变压器分支零序CT、3为厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线、4为厂用进线开关、5为厂用母线、6为备用进线开关、7为备用变压器、8为快切装置、9为变压器保护装置。
具体实施方式
下面结合附图对本发明做进一步详细描述:
参考图1及图2,本发明所述的避免发电厂厂用系统误失电的方法在具体操作时,厂用变压器1接地故障分为两部分,第一部分是厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线3,第二部分是厂用进线开关4下侧与厂用母线5;
根据《DLT 1502-2016厂用电继电保护整定计算导则》中的要求,变压器零序过流保护的出口方式为:零序过流保护I段动作于本分支断路器、闭锁备用电源切换。零序过流保护II段动作于停机、启动备用电源切换。导则中规定的意义是防止由于厂用进线开关4下侧与厂用母线5发生接地故障后,如果快切装置8动作,会造成事故范围扩大,造成备用电源也发生接地。如果是厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线3发生接地,此时厂用进线开关4下侧与厂用母线5并未接地,应该可以启动快切,但是此时快切装置8收到零序过流保护I段保护动作发出的闭锁快切装置信号,快切装置8收到闭锁快切信号后会保持动作信号,直到手动复归为止。零序过流保护II段保护动作启动快切装置8的信号发送给快切装置8后,快切装置8也仍旧无法启动动作,造成全厂厂用系统误失电。
本发明对快切装置8的逻辑进行改动,在收到保护动作闭锁快切的信号后设置延时执行闭锁快切功能,时限与零序过流保护I段、零序过流保护II段保护的动作时间配合,零序过流保护I段动作时间与闭锁快切延时之和大于零序II段保护的动作时间。
具体包括以下步骤:
当厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线3发生接地故障时,厂用变压器分支零序CT2采集到的二次绕组电流发生突变,变压器保护装置9的零序过流保护I段动作,再延时0.6s后断开厂用进线开关4,并发出闭锁快切动作指令,快切装置8收到所述闭锁快切动作指令后延时0.5s后闭锁快切,此时由于厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线3的故障仍然存在,变压器保护装置9的零序过流保护II段在故障发生时延时0.9s后动作,快切装置8的闭锁快切功能未开放,快切动作合入备用进线开关6,厂用母线5由备用变压器7供电;
当厂用母线5发生接地故障时,厂用变压器分支零序CT2采集到的二次绕组电流发生突变,变压器保护装置9的零序过流保护I段动作,再延时0.6s动作断开厂用进线开关4,并发出闭锁快切动作指令,快切装置8收到闭锁快切动作指令后延时0.5s后闭锁快切,此时由于厂用母线5故障点被隔离,厂用变压器分支零序CT2采集到二次绕组电流突变量消失,变压器保护装置9的零序过流保护II段不动作,快切装置8延时0.5s后执行闭锁快切功能,保证备用电源不会误切入厂用母线5而造成故障范围扩大。
本发明适用于带厂用快切装置8的发电厂厂用系统中。
以上所述,仅是本发明的较佳实施例,并非对本发明作任何限制,凡是根据本发明技术实质对以上实施例所作的任何简单修改、变更以及等效结构变化,均仍属于本发明技术方案的保护范围内。

Claims (2)

1.一种避免发电厂厂用系统误失电的方法,其特征在于,包括以下步骤:
当厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线(3)发生接地故障时,厂用变压器分支零序CT(2)采集到的二次绕组电流发生突变,变压器保护装置(9)的零序过流保护I段动作,再进行延时后断开厂用进线开关(4),并发出闭锁快切动作指令,快切装置(8)收到所述闭锁快切动作指令后进行延时后闭锁快切,此时由于厂用变压器低压侧绕组及厂用变压器低压侧绕组至厂用进线开关上侧的连接封闭母线(3)的故障仍然存在,变压器保护装置(9)的零序过流保护II段在故障发生时进行延时后动作,快切装置(8)的闭锁快切功能未开放,快切动作合入备用进线开关(6),厂用母线(5)由备用变压器(7)供电;
当厂用母线(5)发生接地故障时,厂用变压器分支零序CT(2)采集到的二次绕组电流发生突变,变压器保护装置(9)的零序过流保护I段动作,再进行延时后动作断开厂用进线开关(4),并发出闭锁快切动作指令,快切装置(8)收到闭锁快切动作指令后进行延时后闭锁快切,此时由于厂用母线(5)的故障点被隔离,厂用变压器分支零序CT(2)采集到二次绕组电流突变量消失,变压器保护装置(9)的零序过流保护II段不动作,快切装置(8)进行延时后执行闭锁快切功能。
2.根据权利要求1所述的避免发电厂厂用系统误失电的方法,其特征在于,变压器保护装置(9)的零序过流保护I段动作时间与闭锁快切延时之和大于零序过流保护II段的动作时间。
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