CN102570391A - Configuration realization method for transformer protection - Google Patents
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems 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
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
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- Y—GENERAL 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/248—UPS systems or standby or emergency generators
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Abstract
一种变压器保护配置实现方法，变压器保护就地安装，通过SMV和GOOSE网实现包含差动保护、后备过流保护、主变自投等功能。主后保护一体的变压器保护包含差动保护、后备过流保护以及主变自投配置；各侧的后备过流保护独立，即独立于对侧变压器保护的运行状态；过流保护是通过本侧交流插件采集的电流量计算实现的，由各侧保护采集本侧的电流量实现，当对侧保护装置运行异常，闭锁本侧的差动保护时；本侧的后备过流保护能够动作跳闸切除本侧的开关；当运行间隔变压器差动或非电量保护动作并跳闸时，主变自投启动，通过GOOSE网络发送自投合闸命令至备用间隔的主变保护，实现主变的自投功能。
A method for implementing transformer protection configuration. Transformer protection is installed on site, and functions including differential protection, backup overcurrent protection, and main transformer automatic switching are realized through SMV and GOOSE networks. The transformer protection with integrated primary and secondary protection includes differential protection, backup overcurrent protection, and main transformer auto-switching configuration; the backup overcurrent protection on each side is independent, that is, independent of the operating status of the transformer protection on the opposite side; the overcurrent protection is through the local side The calculation of the current volume collected by the AC plug-in is realized by collecting the current volume of the current side by the protection on each side. When the protection device on the opposite side operates abnormally and blocks the differential protection on the local side; the backup overcurrent protection on the local side can be tripped and cut off. The switch on this side; when the differential or non-electrical protection of the transformer in the running interval operates and trips, the main transformer is automatically switched on, and the automatic switch-on command is sent to the main transformer protection in the standby interval through the GOOSE network to realize the automatic switching function of the main transformer.
Description
技术领域 technical field
本发明涉及一种变压器保护配置实现方法，以及采用该方法的保护装置。 The invention relates to a transformer protection configuration realization method and a protection device adopting the method.
背景技术 Background technique
目前数字化变电站中变压器保护一般配置差动保护和后备保护等，组屏安装在保护小室内。保护计算所需的高低压侧交流量是由两侧独立的合并单元装置将通过常规交流头或IEC60044-8协议采集的交流量转成IEC61850-9-2标准协议发送给变压器保护获得的。变压器保护只接受交流信号而不担当发送功能。当任一侧合并单元发生故障，差动保护以及本侧的后备保护就被闭锁，而当变压器保护的CPU板有异常时，所有的保护功能都将闭锁，故障不能被切除，只能由上一级的后备保护来实现故障切除，减小故障影响范围。 At present, transformer protection in digital substations is generally equipped with differential protection and backup protection, etc., and the group screens are installed in the protection cell. The high-voltage and low-voltage side AC volume required for protection calculation is obtained by converting the AC volume collected through the conventional AC head or the IEC60044-8 protocol into the IEC61850-9-2 standard protocol and sending it to the transformer protection by independent merging units on both sides. Transformer protection only accepts AC signals and does not function as a transmitter. When the merging unit on either side fails, the differential protection and the backup protection on this side will be blocked, and when the CPU board protected by the transformer is abnormal, all protection functions will be blocked, and the fault cannot be removed. The first-level backup protection is used to realize fault removal and reduce the impact range of faults.
另外，主变自投功能仍然是由独立的备自投装置来实现的。目前的变压器保护配置方法不能实现在变压器保护里配置主变自投功能的目标。 In addition, the main transformer automatic switching function is still realized by an independent backup automatic switching device. The current transformer protection configuration method cannot achieve the goal of configuring the main transformer automatic switching function in the transformer protection.
发明内容 Contents of the invention
本发明的目的是：为了取消独立的合并单元，实现变压器保护的就地安装以及在变压器保护中实现主变自投功能，本发明提供了一种变压器保护配置实现方法。 The purpose of the present invention is: in order to cancel the independent merging unit, realize the on-site installation of transformer protection and realize the function of main transformer automatic switching in the transformer protection, the present invention provides a transformer protection configuration realization method.
本发明采取的技术方案是：一种变压器保护配置实现方法，其特征是：变压器保护就地安装，在变压器的高低压侧各配一台主后保护一体的变压器保护，通过SMV和GOOSE网实现包含差动保护、后备过流保护、主变自投等功能。主后保护一体的变压器保护包含差动保护、后备过流保护以及主变自投配置； The technical solution adopted by the present invention is: a method for implementing transformer protection configuration, which is characterized in that: transformer protection is installed on the spot, and a transformer protection with integrated main and rear protection is installed on the high and low voltage sides of the transformer, and realized through SMV and GOOSE network Including differential protection, backup overcurrent protection, main transformer automatic switching and other functions. The transformer protection with integrated main and rear protection includes differential protection, backup overcurrent protection and main transformer automatic switching configuration;
各侧的后备过流保护独立，即独立于对侧变压器保护的运行状态；过流保护是通过本侧交流插件采集的电流量计算实现的，由各侧保护采集本侧的电流量实现，当对侧保护装置运行异常，闭锁本侧的差动保护时；本侧的后备过流保护能够动作跳闸切除本侧的开关； The backup overcurrent protection on each side is independent, that is, independent of the operation status of the transformer protection on the opposite side; the overcurrent protection is realized by calculating the current collected by the AC plug-in on the local side, and the protection on each side collects the current on the local side. When the protective device on the opposite side operates abnormally and the differential protection on this side is blocked; the backup overcurrent protection on this side can trip and cut off the switch on this side;
当运行间隔变压器差动或非电量保护动作并跳闸时，主变自投启动，通过GOOSE网络发送自投合闸命令至备用间隔的主变自投保护，实现主变的自投。 When the differential or non-electrical protection of the transformer in the running interval operates and trips, the main transformer will automatically switch on and send the automatic switch-on command to the main transformer in the backup interval through the GOOSE network to realize the automatic switching of the main transformer.
当运行间隔变压器差动或非电量保护动作并跳闸时，主变自投启动，通过GOOSE网络发送自投合闸命令至备用间隔的主变自投保护，实现主变的自投。 When the differential or non-electrical protection of the transformer in the running interval operates and trips, the main transformer will automatically switch on and send the automatic switch-on command to the main transformer in the backup interval through the GOOSE network to realize the automatic switching of the main transformer.
所述差动保护计算所需的电流量由两侧的保护装置采集而来，各侧保护通过常规的交流插件采集本侧的交流量，并转化为遵循IEC61850-9-2标准协议的交流信号利用SMV(GOOSE)插件的光纤通道发往对侧，同时通过SMV(GOOSE)插件接收对侧通过IEC61850-9-2标准协议送过来的对侧交流量，本侧将采集的本侧电流和对侧点对点传送过来的电流进行同步，形成同一时刻的交流量进行差动保护计算，从而实现差动保护。 The current required for the calculation of the differential protection is collected by the protection devices on both sides, and the protection on each side collects the current on this side through a conventional AC plug-in, and converts it into an AC signal that follows the IEC61850-9-2 standard protocol Use the fiber channel of the SMV (GOOSE) plug-in to send to the opposite side, and at the same time receive the opposite side AC traffic sent by the opposite side through the IEC61850-9-2 standard protocol through the SMV (GOOSE) plug-in, and the local side will collect the local current and the opposite side The current transmitted from the side point to point is synchronized to form the AC amount at the same time for differential protection calculation, thereby realizing differential protection.
所述本侧后备过流保护独立于对侧变压器保护的运行状态，过流保护是通过本侧交流插件采集的电流量计算实现的，使得本侧的后备保护仅取决于本侧保护装置的运行状态，当对侧的保护出现异常退出运行时，本侧的后备保护仍能够动作跳闸，切除故障。 The backup overcurrent protection on this side is independent of the operation status of the transformer protection on the opposite side, and the overcurrent protection is realized by calculating the current collected by the AC plug-in on this side, so that the backup protection on this side only depends on the operation of the protection device on this side In this state, when the protection on the opposite side is out of operation due to abnormality, the backup protection on this side can still trip and remove the fault.
主变自投由变压器保护通过GOOSE网络来实现，本间隔变压器保护接收备用间隔变压器保护通过GOOSE网络传送过来的状态量，当本间隔差动保护或非电量保护动作并跳闸时、即无流且本侧开关在跳位时，本间隔差动保护的自投启动，经“自投合闸延时定值”延时可选择输出合分段开关或者合备用变压器低压侧的GOOSE合闸命令；同时备用间隔变压器的变压器低压保护装置或分段保护装置接收GOOSE合闸命令并执行，从而实现主变的自投功能。 The automatic switching of the main transformer is realized by the transformer protection through the GOOSE network. The transformer protection of this interval receives the state quantity transmitted by the transformer protection of the backup interval through the GOOSE network. When the switch on this side is tripping, the auto-switching of the differential protection in this interval starts, and after the delay of the "auto-switching and closing delay setting value", you can choose to output the GOOSE closing command to close the section switch or close the low-voltage side of the standby transformer; at the same time The transformer low-voltage protection device or section protection device of the backup interval transformer receives the GOOSE closing command and executes it, thereby realizing the automatic switching function of the main transformer.
变压器两侧各就地安装一台变压器保护，本侧交流头采集本侧的电流量并转化为IEC61850-9-2标准协议通过SMV(GOOSE)插件的光口点对点发送给对侧，同时接收对侧发送过来的电流SV，利用SMV(GOOSE)插件的GOOSE功能接收、发送GOOSE跳、合闸命令以及保护动作等信号。即该方案就是利用光纤网络实现了保护差动计算所需的交流量的传输从而实现了差动保护计算，同时也利用光纤网络实现主变自投所需的间隔的交流量和开关的状态信息的传输以及跳合闸命令的传输。 A transformer is installed on both sides of the transformer for protection. The AC head on this side collects the current on this side and converts it into an IEC61850-9-2 standard protocol. The current SV sent from the side, use the GOOSE function of the SMV (GOOSE) plug-in to receive and send signals such as GOOSE tripping, closing commands, and protection actions. That is to say, the solution is to use the optical fiber network to realize the transmission of the AC quantity required for the protection differential calculation to realize the differential protection calculation. At the same time, it also uses the optical fiber network to realize the AC quantity and the status information of the switch required for the main transformer automatic switching. transmission and the transmission of the trip and close commands.
变压器高低压侧就地各配备一台主后保护一体的变压器保护。保护包含差动保护、后备过流保护以及主变自投等功能配置：本侧通过常规的交流插件采集本侧的模拟量并转化为遵循IEC61850-9-2标准协议的交流信号利用SMV(GOOSE)插件的光纤通道发往对侧，同时通过SMV(GOOSE)插件接收对侧通过IEC61850-9-2标准协议送过来的对侧交流量。本侧与对侧采样值同步后形成差动保护计算所需的交流量，从而实现差动保护；各侧的后备过流保护独立，由各侧保护采集本侧的电流量实现，当对侧保护装置运行异常，闭锁本侧的差动保护时，本侧的后备保护还可以动作切除本侧的开关；当运行间隔变压器差动或非电量保护动作并跳闸时，主变自投启动，通过GOOSE网络发送自投合闸命令至备用间隔的主变保护，实现主变的自投功能。 The high and low voltage sides of the transformer are respectively equipped with a transformer protection with integrated main and rear protection. The protection includes differential protection, backup overcurrent protection, and main transformer auto-input and other functional configurations: the local side collects the analog quantity of the local side through a conventional AC plug-in and converts it into an AC signal that follows the IEC61850-9-2 standard protocol. Using SMV (GOOSE ) plug-in fiber channel to the opposite side, and at the same time through the SMV (GOOSE) plug-in to receive the opposite side communication traffic sent by the other side through the IEC61850-9-2 standard protocol. The sampling values of this side and the opposite side are synchronized to form the AC quantity required for differential protection calculation, thereby realizing differential protection; the backup overcurrent protection of each side is independent, and the protection of each side collects the current quantity of this side. When the opposite side When the protection device operates abnormally, when the differential protection on this side is blocked, the backup protection on this side can also operate to cut off the switch on this side; The GOOSE network sends the auto-switching closing command to the main transformer protection of the standby interval to realize the auto-switching function of the main transformer.
本发明的机理是利用SV点对点传输的对侧采样延时信息结合本侧的采样处理的延时信息将本对侧电流量进行同步处理，用同步后的电流量进行差动保护计算。而主变自投功能则是主变间隔的保护装置将本间隔的模拟量转换成有无压、有无流等状态量，与开关位置状态一起，通过GOOSE网络发送给另一台主变保护，同时接收GOOSE合闸命令并执行。 The mechanism of the present invention is to use the opposite side sampling delay information of SV point-to-point transmission combined with the delay information of local sampling processing to synchronously process the opposite side current, and use the synchronized current to perform differential protection calculation. The main transformer self-switching function is that the protection device of the main transformer interval converts the analog quantity of this interval into state quantities such as whether there is pressure or not, and whether there is flow or not. Together with the switch position status, it is sent to another main transformer for protection through the GOOSE network. , at the same time receive the GOOSE closing command and execute it.
本发明的有益效果是：实现主变保护就地安装；常规交流头采样以及SV网传输对侧交流采样从而取消独立的合并单元装置；通过GOOSE网络实现主变自投，取消独立的主变自投装置。后备过流保护不受对侧装置运行状态影响，在一侧装置异常闭锁差动保护的情况下，另一侧的后备过流保护仍然能动作切除故障。 The beneficial effects of the present invention are: realize the installation of the main transformer protection on site; conventional AC head sampling and SV network transmission opposite side AC sampling thereby canceling the independent merging unit device; realizing the main transformer automatic switching through the GOOSE network, canceling the independent main transformer automatic switching cast device. The backup overcurrent protection is not affected by the operating status of the device on the opposite side. In the case of abnormal blocking of the differential protection on one side of the device, the backup overcurrent protection on the other side can still act to clear the fault.
附图说明 Description of drawings
图1是变压器保护配置实现方法示意图。 Fig. 1 is a schematic diagram of a method for implementing a transformer protection configuration.
具体实施方式 Detailed ways
在图1中，1#号变高低压侧各有一台主变保护装置，通过各侧CT采集各侧的电流量供本侧过流保护和差动保护使用。同时通过SV网将本侧电流量传送给对侧供对侧差动保护计算用。本侧结合本侧电流量以及对侧送来的对侧电流量，通过同步方法形成同一时刻的交流量再进行差动保护计算。差动保护的计算是采用本行业的常规方法，本发明的配置方法不涉及新的差动保护计算。同时通过GOOSE网络接收对侧的跳闸命令以及发送本侧的差动保护动作信号。 In Figure 1, there is a main transformer protection device on the high and low voltage sides of No. 1# transformer, and the currents on each side are collected through CTs on each side for use in overcurrent protection and differential protection on this side. At the same time, the current on this side is transmitted to the opposite side through the SV network for calculation of the differential protection on the opposite side. The local side combines the current volume of the local side and the current volume of the opposite side sent by the opposite side, and forms the AC volume at the same time through a synchronous method, and then calculates the differential protection. The calculation of differential protection adopts the conventional method in this industry, and the configuration method of the present invention does not involve new calculation of differential protection. At the same time, it receives the trip command from the opposite side and sends the differential protection action signal from the local side through the GOOSE network.
另外，本侧的后备过流保护除了可以使用本侧的复压动作信号外还可以通过GOOSE网获得对侧的复压动作信号来开放。 In addition, the backup overcurrent protection on this side can not only use the complex pressure action signal on this side, but also obtain the complex pressure action signal from the other side through the GOOSE network to open.
主变自投功能如图所示，备用变2#号变的保护装置将本间隔的模拟量转换成有无压、有无流等状态量，与开关位置状态一起，通过GOOSE网络发送给运行变1#号变，经过10s延时，主变自投充电完成。当1#变变压器差动保护或非电量保护动作后，1#主变间隔的自投启动，当主变保护判无流且开关在跳位后，经[自投合闸延时定值]延时（如100ms）可选择输出合分段开关或者合备用变低压侧GOOSE合闸命令。同时2#主变间隔的变低保护装置或分段保护装置接收GOOSE合闸命令并执行，实现主变的自投功能。 The self-switching function of the main transformer is shown in the figure. The protection device of the standby transformer 2# converts the analog quantity of this interval into state quantities such as whether there is pressure or not, and whether there is flow or not. Together with the status of the switch position, it is sent to the operating Change 1#, after a delay of 10s, the main transformer is automatically turned on and charged. After the 1# transformer differential protection or non-electricity protection operates, the automatic switching of the 1# main transformer interval starts, and when the main transformer protection judges that there is no current and the switch is in the jump position, it will be delayed by [automatic switching on delay setting] (For example, 100ms) You can choose to output the close-section switch or the GOOSE close command on the low-voltage side of the standby transformer. At the same time, the low-voltage protection device or section protection device of the 2# main transformer interval receives the GOOSE closing command and executes it, realizing the automatic switching function of the main transformer.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647262A (en) * | 2013-10-25 | 2014-03-19 | 北京四方继保自动化股份有限公司 | In-situ placement type miniature intelligent relay protection device |
| CN105140883A (en) * | 2015-07-07 | 2015-12-09 | 江苏金智科技股份有限公司 | Differential protection system applied to transformer circuit |
| CN105186472A (en) * | 2015-10-14 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Line longitudinal differential protection method for transformer station area information collection |
| CN105305602A (en) * | 2015-11-03 | 2016-02-03 | 成都交大许继电气有限责任公司 | Standby power system of railway digital traction substation and automatic switching method of standby power system |
| CN105896470A (en) * | 2016-06-03 | 2016-08-24 | 南京国电南自电网自动化有限公司 | Double loop network-based protection device free of main in-situ transformer and protection method |
| CN107611930A (en) * | 2017-10-17 | 2018-01-19 | 山东钢铁股份有限公司 | A kind of high voltage protective system |
| CN107769162A (en) * | 2017-11-22 | 2018-03-06 | 国网新疆电力有限公司电力科学研究院 | Generator protection tripgear based on 3/2 wiring condition power plant |
| CN111564821A (en) * | 2020-04-17 | 2020-08-21 | 许昌许继软件技术有限公司 | Automatic configuration method of on-site management unit |
| CN114566945A (en) * | 2022-03-15 | 2022-05-31 | 南京南瑞继保电气有限公司 | Rapid protection method for tap switch of converter transformer |
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| CN105140883A (en) * | 2015-07-07 | 2015-12-09 | 江苏金智科技股份有限公司 | Differential protection system applied to transformer circuit |
| CN105186472A (en) * | 2015-10-14 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Line longitudinal differential protection method for transformer station area information collection |
| CN105186472B (en) * | 2015-10-14 | 2018-09-21 | 南京国电南自电网自动化有限公司 | A kind of circuit longitudinal differential protection method of substation areas of transformer station information taken |
| CN105305602A (en) * | 2015-11-03 | 2016-02-03 | 成都交大许继电气有限责任公司 | Standby power system of railway digital traction substation and automatic switching method of standby power system |
| CN105896470A (en) * | 2016-06-03 | 2016-08-24 | 南京国电南自电网自动化有限公司 | Double loop network-based protection device free of main in-situ transformer and protection method |
| CN107611930A (en) * | 2017-10-17 | 2018-01-19 | 山东钢铁股份有限公司 | A kind of high voltage protective system |
| CN107769162A (en) * | 2017-11-22 | 2018-03-06 | 国网新疆电力有限公司电力科学研究院 | Generator protection tripgear based on 3/2 wiring condition power plant |
| CN111564821A (en) * | 2020-04-17 | 2020-08-21 | 许昌许继软件技术有限公司 | Automatic configuration method of on-site management unit |
| CN114566945A (en) * | 2022-03-15 | 2022-05-31 | 南京南瑞继保电气有限公司 | Rapid protection method for tap switch of converter transformer |
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Owner name: ANSHAN POWER SUPPLY COMPANY, LIAONING ELECTRIC POW Free format text: FORMER OWNER: ANSHAN POWER SUPPLY COMPANY, LIAONING ELECTRIC POWER CO., LTD. Effective date: 20121016 |
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Effective date of registration: 20121016 Address after: Jiangning District of Nanjing City, Jiangsu province 211102 Su Yuan Road No. 69 Applicant after: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant after: Anshan Power Supply Company, Liaoning Electric Power Co., Ltd. Applicant after: State Grid Corporation of China Address before: Jiangning District of Nanjing City, Jiangsu province 211102 Su Yuan Road No. 69 Applicant before: Nanrui Relay Protection Electricity Co., Ltd., Nanjing Applicant before: Anshan Power Supply Company, Liaoning Electric Power Co., Ltd. |
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