CN204190482U - Self-switching backup system with self-adaptive switching in medium resistance grounding mode - Google Patents

Self-switching backup system with self-adaptive switching in medium resistance grounding mode Download PDF

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CN204190482U
CN204190482U CN201420631427.7U CN201420631427U CN204190482U CN 204190482 U CN204190482 U CN 204190482U CN 201420631427 U CN201420631427 U CN 201420631427U CN 204190482 U CN204190482 U CN 204190482U
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bus
switch
transformer
switching
grounding
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陈恒祥
张玥
陶军
刘沪平
邓星
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nanjing Power Supply Co of Jiangsu Electric Power Co
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nanjing Power Supply Co of Jiangsu Electric Power Co
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    • 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
    • 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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Abstract

The utility model discloses a kind of spare power automatic switching system of middle resistance earthing mode self adaptation switching, it comprises backup auto-activating device, be applied in employing and hinder in the 10kV transformer substation system of earthing mode, 10kV transformer substation system adopts and expands outer bridging line mode, 110kV side is the 3 sections of buses connected by bus connection switch, and 10kV side is 4 sections of buses all having 3 ground connection to become; Backup auto-activating device comprises the analog input end of access four sections, 10kV side busbar voltage and electric current; and access 10kV side each duplexure switch, bus connection switch and each bus connect the trip position contact of middle resistance switch; in bus, resistance drops into pressing plate intake contact, and 10kV transformer substation system comprises the contact switch amount input of the intake of all locking prepared auto restarts for each main transformer backup protection, each switch manual trip operation.The utility model, by optimizing spare power automatic switching system structure and operation logic, makes spare power automatic switching system can realize the mutual switching of main power supply, hinders the self adaptation switching of earth point in realizing again.

Description

中阻接地方式自适应投切的备自投系统Self-switching backup system with self-adaptive switching in medium resistance grounding mode

技术领域 technical field

本实用新型涉及电力系统输配电设备中的自动投切技术领域,特别是适用于采用中阻接地方式的10kV多分段母线接线方式的变电站中,以实现主备电源及接地变压器远方自投功能的中阻接地方式自适应投切的备自投系统。  The utility model relates to the technical field of automatic switching in electric power transmission and distribution equipment, and is especially suitable for substations adopting a 10kV multi-section bus connection mode in a medium-resistance grounding mode, so as to realize remote automatic switching of main and standby power supplies and grounding transformers Functional medium resistance grounding mode self-adaptive switching standby self-switching system. the

背景技术 Background technique

随着城市电网的不断发展,城市输配电网中的电缆线路越来越多,造成发生线路接地故障时电容电流的增大,为了限制接地电流,并既快又准地找出故障线路,将故障设备从电网中切除,中性点经中阻接地方式被越来越广泛的应用。  With the continuous development of the urban power grid, there are more and more cable lines in the urban transmission and distribution network, resulting in the increase of the capacitive current when the line ground fault occurs. In order to limit the ground current and quickly and accurately find the fault line, the The faulty equipment is removed from the power grid, and the neutral point is grounded through neutral resistance, which is more and more widely used. the

然而对于多分段母线主接线方式的变电站,采用中性点经中阻接地方式时,每一段母线上都会接入由接地变压器和中阻构成的组件,要求该段母线只能有一个接地点,而当备自投动作使得母线并列运行时,就形成了多个接地点,因此要求备自投系统在完成电源切换同时,具备自动投切接地组件的功能。现有10kV备自投系统只适用于经消弧线圈接地或不接地方式,无法完成具有接地变压器等接地组件的系统接地方式的自适应投切下的主备电源切换。  However, for substations with multi-section busbar main wiring mode, when the neutral point is grounded through medium resistance, each section of busbar will be connected with components composed of grounding transformer and medium resistance, requiring only one grounding point for this section of busbar , and when the standby automatic switching action makes the busbars run in parallel, multiple grounding points are formed. Therefore, the standby automatic switching system is required to have the function of automatically switching the grounding components while completing the power switching. The existing 10kV standby automatic switching system is only suitable for grounding or non-grounding through the arc suppression coil, and cannot complete the main and standby power switch under the self-adaptive switching of the system grounding mode with grounding components such as grounding transformers. the

实用新型内容 Utility model content

本实用新型要解决的技术问题为:通过优化备自投系统结构,应用于采用中阻接地方式的10kV变电站系统中,实现接地变压器的自适应投切功能,同时优化备自投逻辑,使得备自投系统既能实现主备电源的相互投切,又能实现中阻接地点的自适应投切。  The technical problem to be solved by the utility model is: by optimizing the structure of the standby self-switching system, it is applied to the 10kV substation system adopting the medium-resistance grounding method to realize the adaptive switching function of the grounding transformer, and at the same time optimize the standby self-switching logic, so that the backup The self-switching system can not only realize the mutual switching of the main and standby power sources, but also realize the self-adaptive switching of the medium-resistance grounding point. the

本实用新型采取的技术方案为:中阻接地方式自适应投切的备自投系统,应用于采用中阻接地方式的10kV变电站系统中,包括备自投装置;  The technical scheme adopted by the utility model is: the self-switching standby system with self-adaptive switching in the medium resistance grounding mode, which is applied to the 10kV substation system adopting the medium resistance grounding mode, including the standby self-switching device;

所述10kV变电站系统采用扩大外桥接线方式,110kV侧为3段母线,各段母线上分别设置1~3号主变,10kV侧为4段母线,即I~IV母线,I~IV母线分别连接有电压互感器和电流互感器;1号和3号主变低压侧分别连接10kV侧I母线和II母线,2号主变低压侧连接III母线和IV母线;I母线和II母线上分别接入有#1接地变和#2接地变,III母线或IV母线上接入有#3接地变; The 10kV substation system adopts the enlarged outer bridge connection mode. The 110kV side is 3 sections of busbars, and No. 1~3 main transformers are respectively installed on each section of the busbars. There are voltage transformers and current transformers connected; the low-voltage sides of No. 1 and No. 3 main transformers are respectively connected to the I busbar and II busbar of the 10kV side, and the low-voltage side of No. 2 main transformer is connected to the III busbar and IV busbar; There are #1 grounding transformer and #2 grounding transformer connected, and #3 grounding transformer is connected to the III bus or IV bus;

110kV侧的3段母线依次通过母联开关710DL和720DL连接;1号主变和3号主变的高压侧分别连接有分段开关701DL和702DL;靠近各主变的低压侧,I~IV母线上分别设置有分支回路开关101DL、102DL、103DL和203DL;I母线和III母线之间连接有母联开关110DL,II母线和IV母线之间连接有母联开关210DL;#1~#3接地变的母线连接端上分别连接有中阻开关104DL、204DL和109DL; The 3-section buses on the 110kV side are connected through bus tie switches 710DL and 720DL in turn; the high-voltage sides of No. 1 and No. 3 main transformers are respectively connected with section switches 701DL and 702DL; There are branch circuit switches 101DL, 102DL, 103DL and 203DL respectively; bus tie switch 110DL is connected between bus I and bus III, bus tie switch 210DL is connected between bus II and bus IV; #1~#3 grounding transformers The connecting ends of the bus bars are respectively connected with medium-resistance switches 104DL, 204DL and 109DL;

备自投装置包括模拟量输入端和开关量输入端,其中模拟量输入端连接各母线各电压互感器及电流互感器的输出端,以采集10kV侧四段母线的电压和电流;开关量输入端连接10kV侧各分支回路开关、母联开关和各母线所接中阻开关的跳闸位置接点,母线中阻投入压板开入量接点,以及10kV变电站系统中包括针对各主变后备保护、各开关手动跳闸动作的所有闭锁备自投的开入量的接点。 The standby self-injection device includes an analog input terminal and a switch input terminal, where the analog input terminal is connected to the output terminals of each voltage transformer and current transformer of each bus to collect the voltage and current of the four-section bus on the 10kV side; the switch input The terminal is connected to the trip position contacts of each branch circuit switch on the 10kV side, the bus tie switch and the medium resistance switch connected to each busbar, the binary input contact of the busbar medium resistance input pressure plate, and the 10kV substation system includes backup protection for each main transformer, each switch It is the contact of binary input quantity of all blocking equipment automatic switching for manual tripping action.

本实用新型系统中,备自投装置接入四段母线I母、II母、III母、IV母的电压,可用于备自投的有压、无压判别;接入10kV侧各分支回路电流可用于防止母线三相断线后造成备自投误动作;接入开关101DL、102DL、103DL、203DL、110DL、210DL的跳闸位置接点,可用于系统接线方式的判别,确认开关是否断开及备自投充电、放电和动作判断;接入开关104DL、109DL、204DL的跳闸位置接点及母线中阻投入压板开入量,可用于判断系统的接地方式及中阻的自投切准备。接入变压器高低压侧开关101DL、701DL、710DL、103DL、203DL、102DL、730DL、702DL手动跳闸位置接点,可用于闭锁备自投。  In the system of the utility model, the voltage of the four-section bus I bus, II bus, III bus, and IV bus connected to the backup self-injection device can be used for the voltage and non-voltage discrimination of the backup self-injection device; the current of each branch circuit connected to the 10kV side It can be used to prevent misoperation of backup self-switching after the three-phase disconnection of the busbar; the trip position contact of the access switch 101DL, 102DL, 103DL, 203DL, 110DL, 210DL can be used to judge the wiring mode of the system, confirm whether the switch is disconnected and the backup Self-switching charging, discharging and action judgment; the trip position contacts of the access switches 104DL, 109DL, 204DL and the input value of the middle resistance input pressure plate of the busbar can be used to judge the grounding method of the system and the preparation for automatic switching of the middle resistance. Connect to the high and low voltage side switches 101DL, 701DL, 710DL, 103DL, 203DL, 102DL, 730DL, 702DL manual trip position contacts, which can be used for blocking and automatic switching. the

定义10kV侧各分支回路名称以其线路上所设分支回路开关编号代替,基于上述中阻接地方式自适应投切的备自投系统的运行方法,包括以下自投方式:  Define the name of each branch circuit on the 10kV side to be replaced by the number of the branch circuit switch set on the line. The operation method of the automatic switching system based on the above-mentioned medium resistance grounding mode adaptive switching includes the following automatic switching methods:

1)#3接地变接入III母线,101线为103线的暗备用: 1) #3 grounding transformer is connected to busbar III, and line 101 is the dark standby of line 103:

充电条件:10kV侧Ⅰ母线和Ⅲ母线均三相有压,101DL和103DL在合位,110DL在分位,无闭锁开入量,经备自投充电时间后充电完成; Charging conditions: 10kV side Ⅰ busbar and Ⅲ busbar have three-phase voltage, 101DL and 103DL are in close position, 110DL is in split position, there is no blocking input, and the charging is completed after the charging time of standby and self-injection;

放电条件:手动跳闸101DL、701DL、710DL和103DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 101DL, 701DL, 710DL and 103DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅲ母线无电压,Ⅰ母线有电压,103线上无电流,为防止1号主变过负荷,10kV侧Ⅲ母线失压前101线上电流和103线上电流之和小于1号主变额定电流的1.2倍; Start-up conditions: no voltage on the Ⅲ busbar on the 10kV side, voltage on the I busbar, no current on the 103 line, in order to prevent the No. 1 main transformer from being overloaded, the sum of the current on the 101 line and the 103 line before the 10kV side III bus loses voltage is less than 1 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,备自投装置先跳开103DL,同时判断Ⅲ母线接地变运行方式:若#3接地变投入运行,则跳开109DL开关,然后合上110DL;若接地变未投运,则直接合上110DL; Action logic: After the starting conditions are met, the standby self-transmitting device first trips 103DL, and at the same time judges the operation mode of the grounding transformer of the Ⅲ busbar: if the #3 grounding transformer is put into operation, then trips the 109DL switch, and then closes 110DL; if the grounding transformer is not turned on luck, then close 110DL directly;

   此时的运行方式为1号主变带I母线和III母线并列运行,I母线上接有#1接地变,3号主变带IV母线运行,2号主变带II母线运行,II母线与IV母线分列运行,II母线上接有#2接地变; The operation mode at this time is that No. 1 main transformer runs with I busbar and III busbar in parallel, I busbar is connected with #1 grounding transformer, No. 3 main transformer runs with IV busbar, No. 2 main transformer runs with II busbar, II busbar and The IV bus runs separately, and the II bus is connected to the #2 grounding transformer;

2)#3接地变接入III母线,103线为101线的暗备用: 2) #3 grounding transformer is connected to busbar III, and line 103 is the dark standby of line 101:

充电条件:10kV侧Ⅰ母线和Ⅲ母线均三相有压,101DL和103DL在合位,110DL在分位,无其它外部闭锁量,经备自投充电时间后充电完成; Charging conditions: Both busbar I and busbar III on the 10kV side have three-phase voltage, 101DL and 103DL are in close position, 110DL is in partial position, there is no other external blocking value, and the charging is completed after the charging time of standby and automatic switching;

放电条件:手动跳闸101DL、701DL、710DL和103DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 101DL, 701DL, 710DL and 103DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅰ母线无压,Ⅲ母线有压,103线上无电流,为防止3号主变过负荷,10kV侧Ⅰ母线失压前101线上电流和103线上电流之和小于3号主变额定电流的1.2倍; Start-up conditions: 10kV side I bus has no voltage, III bus has voltage, no current on line 103, in order to prevent No. 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,先跳开101DL,若I母线上接入#1接地变,则同时跳开104DL合上210DL,再跳开203DL,最后合上110DL; Action logic: After the starting conditions are met, switch off 101DL first, and if the #1 ground transformer is connected to the I bus, then switch off 104DL and switch on 210DL at the same time, switch off 203DL, and finally switch on 110DL;

此时的运行方式为3号主变带I母线和III母线并列运行,III母线上接有#3接地变,2号主变带II母线和IV母线并列运行,II母线上接有#2接地变; The operation mode at this time is that the No. 3 main transformer runs in parallel with the I bus and III bus, and the #3 grounding transformer is connected to the III bus, and the No. 2 main transformer runs in parallel with the II bus and the IV bus, and the II bus is connected with #2 grounding Change;

3)#3接地变接入III母线,102线为203线的暗备用: 3) The #3 grounding transformer is connected to the III bus, and the 102 line is the dark standby of the 203 line:

充电条件:10kV侧Ⅱ母线和Ⅳ母线均三相有压,102DL和203DL在合位,210DL在分位,无其它外部闭锁开入量,经备自投充电时间后充电完成; Charging conditions: Both busbar II and busbar IV on the 10kV side have three-phase voltage, 102DL and 203DL are in the close position, 210DL is in the split position, there is no other external locking input, and the charging is completed after the charging time of the standby auto-injection;

放电条件:手动跳闸102DL、702DL、730DL和203DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 102DL, 702DL, 730DL and 203DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅳ母线无压,Ⅱ母线有压,203线上无电流,为防止2号主变过负荷,10kV侧Ⅳ母线失压前203线上电流和102线上电流之和小于2号主变额定电流的1.2倍; Start-up conditions: 10kV side IV bus has no voltage, II bus has voltage, no current on line 203, in order to prevent No. 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,先跳开203DL,同时判断Ⅳ母线接地变运行方式,若Ⅳ母线未接入接地变,则合上110DL; Action logic: After the starting conditions are met, first jump off 203DL, and at the same time judge the operation mode of the IV bus grounding transformer, if the IV bus is not connected to the grounding transformer, turn on 110DL;

   此时的运行方式为1号主变带I母线运行,3号主变带III母线与运行,I母线与III母线分列运行,I母线上接有#1接地变,III母线上接有#3接地变,2号主变带II母线与IV母线并列运行,II母线上接有#2接地变; The operation mode at this time is that the No. 1 main transformer runs with the I bus, the No. 3 main transformer runs with the III bus, the I bus and the III bus run separately, the I bus is connected to the #1 grounding transformer, and the III bus is connected to the # 3 grounding transformer, No. 2 main transformer runs in parallel with busbar II and busbar IV, and #2 grounding transformer is connected to busbar II;

4)#3接地变接入III母线,203线为102线的暗备用: 4) #3 grounding transformer is connected to busbar III, and line 203 is the dark standby of line 102:

充电条件:10kV侧Ⅱ母线和Ⅳ母线均三相有压,102DL和203DL在合位,210DL在分位,无其它外部闭锁开入量,经备自投充电时间后充电完成; Charging conditions: Both busbar II and busbar IV on the 10kV side have three-phase voltage, 102DL and 203DL are in the close position, 210DL is in the split position, there is no other external locking input, and the charging is completed after the charging time of the standby auto-injection;

放电条件:手动跳闸102DL、702DL、730DL和203DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 102DL, 702DL, 730DL and 203DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅱ母线无压,Ⅳ母线有压,102线上无流,为防止3号主变过负荷,10kV侧Ⅳ母线失压前203线上电流和102线上电流之和小于3号主变额定电流的1.2倍; Start-up conditions: 10kV side II bus has no voltage, IV bus has voltage, no current on line 102, in order to prevent No. 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,先跳开102DL,若II母线上接入#2接地变,则同时跳开204DL,合上210DL后,再跳开203DL,同时判断III母线接地方式,若#3接地变接入III母线,则跳开#3接地变,最后合上110DL; Action logic: After satisfying the starting conditions, first jump off 102DL, if the #2 grounding transformer is connected to the II bus, then jump off 204DL at the same time, after closing 210DL, then jump off 203DL, and judge the III bus grounding mode at the same time, if #3 If the grounding transformer is connected to the III bus, jump off the #3 grounding transformer, and finally close 110DL;

此时的运行方式为1号主变带I母线与III母线并列运行,I母线上接有#1接地变,3号主变带II母线与IV母线并列运行,IV母线上接有#2接地变。 The operation mode at this time is that the No. 1 main transformer runs in parallel with the I bus and the III bus, and the #1 grounding transformer is connected to the I bus, and the No. 3 main transformer runs in parallel with the II bus and the IV bus, and the IV bus is connected with #2 grounding Change.

对于接地变运行方式的判断,利用装置内部母线中阻投入软压板和对侧母线中阻均投软压板实现,母线中阻投入软压板用于判断本段母线接地变是否运行,对侧母线中阻均投软压板用于判断需要并列的母线是否存在两个接地点,如对侧母线中阻均投软压板用于判断#3接地变运行在哪段母线,当判断出接于III母线时,I母线与III母线并列运行时切除#3接地变。  For the judgment of the operation mode of the grounding substation, it is realized by using the soft pressure plate of the inner busbar of the device and the soft pressure plate of the opposite side busbar. The soft pressure plate of resistance equalization is used to judge whether there are two grounding points in the bus that needs to be paralleled. For example, the soft pressure plate of resistance equalization in the opposite bus is used to judge which bus section #3 grounding transformer is running on. When it is judged that it is connected to III bus , Cut off the #3 grounding transformer when the I bus and the III bus run in parallel. the

本实用新型的有益效果为,根据接入的模拟量和开关量,系统中的备自投装置能够自动识别系统当前的运行方式,可实现10kV侧各分支回路间的互投,可实现接地中阻的自适应切换。考虑到两路电源不能长时间并列运行及备自投的动作条件,在正常情况下系统运行方式为,101DL、102DL、103DL、203DL开关为合位,110DL、210DL为分位。根据运行方式,备自投装置采用原理逻辑分开,硬件整合的设计,共有四种主备电源自投方式,在四种方式下由于接地变运行方式不同造成最终的动作逻辑也各有不同,备自投装置均能自动识别接地方式,实现接地变压器的自适应投切。  The beneficial effect of the utility model is that, according to the connected analog quantity and switch quantity, the backup self-injection device in the system can automatically identify the current operation mode of the system, and can realize the mutual investment between the branch circuits on the 10kV side, and can realize the grounding Resistance adaptive switching. Considering that the two power supplies cannot run in parallel for a long time and the operating conditions of the standby self-switching, under normal circumstances, the system operation mode is that the 101DL, 102DL, 103DL, and 203DL switches are in the closed position, and the 110DL and 210DL are in the partial position. According to the operation mode, the backup self-switching device adopts the principle logic separation and the design of hardware integration. There are four main and standby power supply self-switching modes. In the four modes, the final action logic is also different due to the different operation modes of the grounding transformer. All self-switching devices can automatically identify the grounding method to realize self-adaptive switching of the grounding transformer. the

附图说明 Description of drawings

图1所示为本实用新型系统主接线结构示意图;  Figure 1 is a schematic diagram of the main wiring structure of the utility model system;

图2所示为图1中#1部分备自投工作逻辑原理示意图; Figure 2 is a schematic diagram of the working logic principle of the standby auto-injection part #1 in Figure 1;

图3所示为图1中#2部分备自投工作逻辑原理示意图。 Fig. 3 is a schematic diagram of the working logic principle of the standby auto-injection part #2 in Fig. 1 .

具体实施方式 Detailed ways

以下结合附图和具体实施例进一步说明。  Further description will be given below in conjunction with the accompanying drawings and specific embodiments. the

本实用新型的中阻接地方式自适应投切的备自投系统,应用于采用中阻接地方式的10kV变电站系统中,包括备自投装置,请参考图1;  The utility model's self-adaptive switching standby system with medium resistance grounding mode is applied to the 10kV substation system adopting medium resistance grounding mode, including the standby self-switching device, please refer to Figure 1;

10kV变电站系统采用扩大外桥接线方式,110kV侧为3段母线,各段母线上分别设置1~3号主变,10kV侧为4段母线,即I~IV母线,I~IV母线分别连接有电压互感器和电流互感器;1号和3号主变低压侧分别连接10kV侧I母线和II母线,2号主变低压侧连接III母线和IV母线;I母线和II母线上分别接入有#1接地变和#2接地变,III母线或IV母线上接入有#3接地变; The 10kV substation system adopts the extended outer bridge connection method. The 110kV side is 3 sections of busbars, and No. 1~3 main transformers are respectively set on each section of the busbars. The 10kV side is 4 sections of busbars, namely I~IV busbars. Voltage transformers and current transformers; No. 1 and No. 3 main transformer low-voltage sides are respectively connected to 10kV side I busbar and II busbar; No. 2 main transformer low-voltage side is connected to III busbar and IV busbar; I busbar and II busbar are respectively connected to #1 grounding transformer and #2 grounding transformer, and #3 grounding transformer connected to III bus or IV bus;

110kV侧的3段母线依次通过母联开关710DL和720DL连接;1号主变和3号主变的高压侧分别连接有分段开关701DL和702DL;靠近各主变的低压侧,I~IV母线上分别设置有分支回路开关101DL、102DL、103DL和203DL;I母线和III母线之间连接有母联开关110DL,II母线和IV母线之间连接有母联开关210DL;#1~#3接地变的母线连接端上分别连接有中阻开关104DL、204DL和109DL; The 3-section buses on the 110kV side are connected through bus tie switches 710DL and 720DL in turn; the high-voltage sides of No. 1 and No. 3 main transformers are respectively connected with section switches 701DL and 702DL; There are branch circuit switches 101DL, 102DL, 103DL and 203DL respectively; bus tie switch 110DL is connected between bus I and bus III, bus tie switch 210DL is connected between bus II and bus IV; #1~#3 grounding transformers The connecting ends of the bus bars are respectively connected with medium-resistance switches 104DL, 204DL and 109DL;

备自投装置包括模拟量输入端和开关量输入端,其中模拟量输入端连接各母线各电压互感器及电流互感器的输出端,以采集10kV侧四段母线的电压和电流;开关量输入端连接10kV侧各分支回路开关、母联开关和各母线所接中阻开关的跳闸位置接点,母线中阻投入压板开入量接点,以及10kV变电站系统中包括针对各主变后备保护、各开关手动跳闸动作的所有闭锁备自投的开入量的接点。 The standby self-injection device includes an analog input terminal and a switch input terminal, where the analog input terminal is connected to the output terminals of each voltage transformer and current transformer of each bus to collect the voltage and current of the four-section bus on the 10kV side; the switch input The terminal is connected to the trip position contacts of each branch circuit switch on the 10kV side, the bus tie switch and the medium resistance switch connected to each busbar, the binary input contact of the busbar medium resistance input pressure plate, and the 10kV substation system includes backup protection for each main transformer, each switch It is the contact of binary input quantity of all blocking equipment automatic switching for manual tripping action.

本实用新型系统中,备自投装置接入四段母线I母、II母、III母、IV母的电压,可用于备自投的有压、无压判别;接入10kV侧各分支回路电流可用于防止母线三相断线后造成备自投误动作;接入开关101DL、102DL、103DL、203DL、110DL、210DL的跳闸位置接点,可用于系统接线方式的判别,确认开关是否断开及备自投充电、放电和动作判断;接入开关104DL、109DL、204DL的跳闸位置接点及母线中阻投入压板开入量,可用于判断系统的接地方式及中阻的自投切准备。接入变压器高低压侧开关101DL、701DL、710DL、103DL、203DL、102DL、730DL、702DL手动跳闸位置接点,可用于闭锁备自投。  In the system of the utility model, the voltage of the four-section bus I bus, II bus, III bus, and IV bus connected to the backup self-injection device can be used for the voltage and non-voltage discrimination of the backup self-injection device; the current of each branch circuit connected to the 10kV side It can be used to prevent misoperation of backup self-switching after the three-phase disconnection of the busbar; the trip position contact of the access switch 101DL, 102DL, 103DL, 203DL, 110DL, 210DL can be used to judge the wiring mode of the system, confirm whether the switch is disconnected and the backup Self-switching charging, discharging and action judgment; the trip position contacts of the access switches 104DL, 109DL, 204DL and the input value of the middle resistance input pressure plate of the busbar can be used to judge the grounding method of the system and the preparation for automatic switching of the middle resistance. Connect to the high and low voltage side switches 101DL, 701DL, 710DL, 103DL, 203DL, 102DL, 730DL, 702DL manual trip position contacts, which can be used for blocking and automatic switching. the

结合图1 至图3,本实用新型的备自投系统运行包括#1部分和#2部分,图2与图3中,K1\K2为电流变比系数,电流变比大的变比系数取1,电流变比小的变比系数为小的电流变比与大的电流变比的比值。  In combination with Fig. 1 to Fig. 3, the operation of the standby automatic switching system of the present utility model includes part #1 and part #2. In Fig. 2 and Fig. 3, K1\K2 is the current transformation ratio coefficient, and the transformation ratio coefficient with a large current transformation ratio is taken as 1. The ratio coefficient of the small electromagnetism ratio is the ratio of the small electromagnetism ratio to the large electromagnetism ratio. the

本实用新型根据接入的模拟量和开关量,系统中的备自投装置能够自动识别系统当前的运行方式,可实现10kV侧各分支回路间的互投,可实现接地中阻的自适应切换。考虑到两路电源不能长时间并列运行及备自投的动作条件,在正常情况下系统运行方式为,101DL、102DL、103DL、203DL开关为合位,110DL、210DL为分位。根据运行方式,备自投装置采用原理逻辑分开,硬件整合的设计,共有四种主备电源自投方式,在四种方式下由于接地变运行方式不同造成最终的动作逻辑也各有不同,备自投装置均能自动识别接地方式,实现接地变压器的自适应投切。  According to the connected analog quantity and switching quantity, the utility model can automatically identify the current operation mode of the system by the standby self-injection device in the system, and can realize the mutual investment between the branch circuits on the 10kV side, and can realize the self-adaptive switching of the grounding intermediate resistance . Considering that the two power supplies cannot run in parallel for a long time and the operating conditions of the standby self-switching, under normal circumstances, the system operation mode is that the 101DL, 102DL, 103DL, and 203DL switches are in the closed position, and the 110DL and 210DL are in the partial position. According to the operation mode, the backup self-switching device adopts the principle logic separation and the design of hardware integration. There are four main and standby power supply self-switching modes. In the four modes, the final action logic is also different due to the different operation modes of the grounding transformer. All self-switching devices can automatically identify the grounding method to realize self-adaptive switching of the grounding transformer. the

定义10kV侧各分支回路名称以其线路上所设分支回路开关编号代替,本实用新型基于上述中阻接地方式自适应投切的备自投系统的运行方法,包括以下自投方式:  Define the name of each branch circuit on the 10kV side to be replaced by the number of the branch circuit switch set on the line. The utility model is based on the above-mentioned medium resistance grounding mode adaptive switching standby self-switching system operation method, including the following self-switching methods:

1)#3接地变接入III母线,101线为103线的暗备用: 1) #3 grounding transformer is connected to busbar III, and line 101 is the dark standby of line 103:

充电条件:10kV侧Ⅰ母线和Ⅲ母线均三相有压,101DL和103DL在合位,110DL在分位,无闭锁开入量,经备自投充电时间后充电完成; Charging conditions: 10kV side Ⅰ busbar and Ⅲ busbar have three-phase voltage, 101DL and 103DL are in close position, 110DL is in split position, there is no blocking input, and the charging is completed after the charging time of standby and self-injection;

放电条件:手动跳闸101DL、701DL、710DL和103DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 101DL, 701DL, 710DL and 103DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅲ母线无电压,Ⅰ母线有电压,103线上无电流,为防止1号主变过负荷,10kV侧Ⅲ母线失压前101线上电流和103线上电流之和小于1号主变额定电流的1.2倍; Start-up conditions: no voltage on the Ⅲ busbar on the 10kV side, voltage on the I busbar, no current on the 103 line, in order to prevent the No. 1 main transformer from being overloaded, the sum of the current on the 101 line and the 103 line before the 10kV side III bus loses voltage is less than 1 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,备自投装置先跳开103DL,同时判断Ⅲ母线接地变运行方式:若#3接地变投入运行,则跳开109DL开关,然后合上110DL;若接地变未投运,则直接合上110DL; Action logic: After the starting conditions are met, the standby self-transmitting device first trips 103DL, and at the same time judges the operation mode of the grounding transformer of the Ⅲ busbar: if the #3 grounding transformer is put into operation, then trips the 109DL switch, and then closes 110DL; if the grounding transformer is not turned on luck, then close 110DL directly;

   此时的运行方式为1号主变带I母线和III母线并列运行,I母线上接有#1接地变,3号主变带IV母线运行,2号主变带II母线运行,II母线与IV母线分列运行,II母线上接有#2接地变; The operation mode at this time is that No. 1 main transformer runs with I busbar and III busbar in parallel, I busbar is connected with #1 grounding transformer, No. 3 main transformer runs with IV busbar, No. 2 main transformer runs with II busbar, II busbar and The IV bus runs separately, and the II bus is connected to the #2 grounding transformer;

2)#3接地变接入III母线,103线为101线的暗备用: 2) #3 grounding transformer is connected to busbar III, and line 103 is the dark standby of line 101:

充电条件:10kV侧Ⅰ母线和Ⅲ母线均三相有压,101DL和103DL在合位,110DL在分位,无其它外部闭锁量,经备自投充电时间后充电完成; Charging conditions: Both busbar I and busbar III on the 10kV side have three-phase voltage, 101DL and 103DL are in close position, 110DL is in partial position, there is no other external blocking value, and the charging is completed after the charging time of standby and automatic switching;

放电条件:手动跳闸101DL、701DL、710DL和103DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 101DL, 701DL, 710DL and 103DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅰ母线无压,Ⅲ母线有压,103线上无电流,为防止3号主变过负荷,10kV侧Ⅰ母线失压前101线上电流和103线上电流之和小于3号主变额定电流的1.2倍; Start-up conditions: 10kV side I bus has no voltage, III bus has voltage, no current on line 103, in order to prevent No. 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,先跳开101DL,若I母线上接入#1接地变,则同时跳开104DL合上210DL,再跳开203DL,最后合上110DL; Action logic: After the starting conditions are met, switch off 101DL first, and if the #1 ground transformer is connected to the I bus, then switch off 104DL and switch on 210DL at the same time, switch off 203DL, and finally switch on 110DL;

此时的运行方式为3号主变带I母线和III母线并列运行,III母线上接有#3接地变,2号主变带II母线和IV母线并列运行,II母线上接有#2接地变; The operation mode at this time is that the No. 3 main transformer runs in parallel with the I bus and III bus, and the #3 grounding transformer is connected to the III bus, and the No. 2 main transformer runs in parallel with the II bus and the IV bus, and the II bus is connected with #2 grounding Change;

3)#3接地变接入III母线,102线为203线的暗备用: 3) The #3 grounding transformer is connected to the III bus, and the 102 line is the dark standby of the 203 line:

充电条件:10kV侧Ⅱ母线和Ⅳ母线均三相有压,102DL和203DL在合位,210DL在分位,无其它外部闭锁开入量,经备自投充电时间后充电完成; Charging conditions: Both busbar II and busbar IV on the 10kV side have three-phase voltage, 102DL and 203DL are in the close position, 210DL is in the split position, there is no other external locking input, and the charging is completed after the charging time of the standby auto-injection;

放电条件:手动跳闸102DL、702DL、730DL和203DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 102DL, 702DL, 730DL and 203DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅳ母线无压,Ⅱ母线有压,203线上无电流,为防止2号主变过负荷,10kV侧Ⅳ母线失压前203线上电流和102线上电流之和小于2号主变额定电流的1.2倍; Start-up conditions: 10kV side IV bus has no voltage, II bus has voltage, no current on line 203, in order to prevent No. 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,先跳开203DL,同时判断Ⅳ母线接地变运行方式,若Ⅳ母线未接入接地变,则合上110DL; Action logic: After the starting conditions are met, first jump off 203DL, and at the same time judge the operation mode of the IV bus grounding transformer, if the IV bus is not connected to the grounding transformer, turn on 110DL;

   此时的运行方式为1号主变带I母线运行,3号主变带III母线与运行,I母线与III母线分列运行,I母线上接有#1接地变,III母线上接有#3接地变,2号主变带II母线与IV母线并列运行,II母线上接有#2接地变; The operation mode at this time is that the No. 1 main transformer runs with the I bus, the No. 3 main transformer runs with the III bus, the I bus and the III bus run separately, the I bus is connected to the #1 grounding transformer, and the III bus is connected to the # 3 grounding transformer, No. 2 main transformer runs in parallel with busbar II and busbar IV, and #2 grounding transformer is connected to busbar II;

4)#3接地变接入III母线,203线为102线的暗备用: 4) #3 grounding transformer is connected to busbar III, and line 203 is the dark standby of line 102:

充电条件:10kV侧Ⅱ母线和Ⅳ母线均三相有压,102DL和203DL在合位,210DL在分位,无其它外部闭锁开入量,经备自投充电时间后充电完成; Charging conditions: Both busbar II and busbar IV on the 10kV side have three-phase voltage, 102DL and 203DL are in the close position, 210DL is in the split position, there is no other external locking input, and the charging is completed after the charging time of the standby auto-injection;

放电条件:手动跳闸102DL、702DL、730DL和203DL,或备自投装置接收到其他外部闭锁信号; Discharge conditions: manual trip 102DL, 702DL, 730DL and 203DL, or the standby automatic switching device receives other external blocking signals;

启动条件:10kV侧Ⅱ母线无压,Ⅳ母线有压,102线上无流,为防止3号主变过负荷,10kV侧Ⅳ母线失压前203线上电流和102线上电流之和小于3号主变额定电流的1.2倍; Start-up conditions: 10kV side II bus has no voltage, IV bus has voltage, no current on line 102, in order to prevent No. 1.2 times the rated current of the main transformer;

动作逻辑:满足启动条件后,先跳开102DL,若II母线上接入#2接地变,则同时跳开204DL,合上210DL后,再跳开203DL,同时判断III母线接地方式,若#3接地变接入III母线,则跳开#3接地变,最后合上110DL; Action logic: After satisfying the starting conditions, first jump off 102DL, if the #2 grounding transformer is connected to the II bus, then jump off 204DL at the same time, after closing 210DL, then jump off 203DL, and judge the III bus grounding mode at the same time, if #3 If the grounding transformer is connected to the III bus, jump off the #3 grounding transformer, and finally close 110DL;

此时的运行方式为1号主变带I母线与III母线并列运行,I母线上接有#1接地变,3号主变带II母线与IV母线并列运行,IV母线上接有#2接地变。 The operation mode at this time is that the No. 1 main transformer runs in parallel with the I bus and the III bus, and the #1 grounding transformer is connected to the I bus, and the No. 3 main transformer runs in parallel with the II bus and the IV bus, and the IV bus is connected with #2 grounding Change.

对于接地变运行方式的判断,利用装置内部母线中阻投入软压板和对侧母线中阻均投软压板实现,母线中阻投入软压板用于判断本段母线接地变是否运行,对侧母线中阻均投软压板用于判断需要并列的母线是否存在两个接地点,如对侧母线中阻均投软压板用于判断#3接地变运行在哪段母线,当判断出接于III母线时,I母线与III母线并列运行时切除#3接地变。  For the judgment of the operation mode of the grounding substation, it is realized by using the soft pressure plate of the inner busbar of the device and the soft pressure plate of the opposite side busbar. The soft pressure plate of resistance equalization is used to judge whether there are two grounding points in the bus that needs to be paralleled. For example, the soft pressure plate of resistance equalization in the opposite bus is used to judge which bus section #3 grounding transformer is running on. When it is judged that it is connected to III bus , Cut off the #3 grounding transformer when the I bus and the III bus run in parallel. the

本实用新型通过优化备自投逻辑,应用于采用中阻接地方式的10kV变电站系统中,实现接地变压器的自适应投切功能,同时既能实现主备电源的相互投切,又能实现中阻接地点的自适应投切。  The utility model is applied to the 10kV substation system adopting the medium-resistance grounding mode by optimizing the standby self-switching logic, and realizes the self-adaptive switching function of the grounding transformer. Adaptive switching of the grounding point. the

Claims (1)

1. hinder the spare power automatic switching system of earthing mode self adaptation switching in, be applied in employing and hinder in the 10kV transformer substation system of earthing mode, it is characterized in that: comprise backup auto-activating device;
Described 10kV transformer substation system adopts and expands outer bridging line mode, and 110kV side is 3 sections of buses, each section of bus is arranged respectively 1 ~ No. 3 main transformer, and 10kV side is 4 sections of buses, i.e. I ~ IV bus, and I ~ IV bus is connected to voltage transformer summation current transformer; No. 1 is connected 10kV side I bus and II bus respectively with No. 3 main transformer low-pressure sides, and No. 2 main transformer low-pressure sides connect III bus and IV bus; I bus and II bus have access to the change of #1 ground connection and the change of #2 ground connection respectively, III bus or IV bus have access to the change of #3 ground connection;
3 sections of buses of 110kV side are connected by bus connection switch 710DL with 720DL successively; The high-pressure side of No. 1 main transformer and No. 3 main transformers is connected to block switch 701DL and 702DL; Near the low-pressure side of each main transformer, I ~ IV bus is respectively arranged with duplexure switch 101DL, 102DL, 103DL and 203DL; Be connected with bus connection switch 110DL between I bus and III bus, between II bus and IV bus, be connected with bus connection switch 210DL; The bus link that #1 ~ #3 ground connection becomes is connected to middle resistance switch 104DL, 204DL and 109DL;
Backup auto-activating device comprises analog input end and On-off signal end, and wherein analog input end connects the output of each voltage transformer and current transformer, to gather the voltage and current of the four sections of buses in 10kV side; On-off signal end connect 10kV side each duplexure switch, bus connection switch and each bus connect the trip position contact of middle resistance switch; in bus, resistance drops into pressing plate intake contact, and 10kV transformer substation system system comprises the contact of the intake of all locking prepared auto restarts for each main transformer backup protection, each switch manual trip operation.
CN201420631427.7U 2014-10-29 2014-10-29 Self-switching backup system with self-adaptive switching in medium resistance grounding mode Expired - Fee Related CN204190482U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104333118A (en) * 2014-10-29 2015-02-04 国家电网公司 Spare power automatic switching system with self-adaptive switching intermediate resistance grounding mode, and operation method thereof
CN109149570A (en) * 2018-09-20 2019-01-04 国网江苏省电力有限公司镇江供电分公司 Interior bridge and single-trunk segmental wiring transformer substation spare power automatic switching simplify relay protecting method
CN113013877A (en) * 2021-03-05 2021-06-22 国网安徽省电力有限公司黄山供电公司 Closed loop transfer method between 35kV lines under phase difference condition
CN113612305A (en) * 2021-06-29 2021-11-05 深圳供电局有限公司 10KV standby power supply automatic switching control method and device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104333118A (en) * 2014-10-29 2015-02-04 国家电网公司 Spare power automatic switching system with self-adaptive switching intermediate resistance grounding mode, and operation method thereof
CN109149570A (en) * 2018-09-20 2019-01-04 国网江苏省电力有限公司镇江供电分公司 Interior bridge and single-trunk segmental wiring transformer substation spare power automatic switching simplify relay protecting method
CN109149570B (en) * 2018-09-20 2022-01-11 国网江苏省电力有限公司镇江供电分公司 Spare power automatic switching simplified relay protection method for internal bridge and single bus segmented wiring transformer substation
CN113013877A (en) * 2021-03-05 2021-06-22 国网安徽省电力有限公司黄山供电公司 Closed loop transfer method between 35kV lines under phase difference condition
CN113013877B (en) * 2021-03-05 2024-03-12 国网安徽省电力有限公司黄山供电公司 Method for providing loop closing and transferring between 35kV lines under phase difference condition
CN113612305A (en) * 2021-06-29 2021-11-05 深圳供电局有限公司 10KV standby power supply automatic switching control method and device
CN113612305B (en) * 2021-06-29 2024-01-19 深圳供电局有限公司 10KV standby power supply automatic switching control method and device

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