WO2020181982A1 - 一种分布式接地选线系统及方法 - Google Patents

一种分布式接地选线系统及方法 Download PDF

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Publication number
WO2020181982A1
WO2020181982A1 PCT/CN2020/076424 CN2020076424W WO2020181982A1 WO 2020181982 A1 WO2020181982 A1 WO 2020181982A1 CN 2020076424 W CN2020076424 W CN 2020076424W WO 2020181982 A1 WO2020181982 A1 WO 2020181982A1
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line selection
grounding line
sequence current
branch
zero sequence
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French (fr)
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侯炜
石勇
董凯达
金震
陈俊
顾浩
许宗光
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured

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  • the invention belongs to the field of power system relay protection, and particularly relates to a system and method for single-phase grounding fault line selection in a small current grounding system.
  • single-phase grounding is a common type of fault.
  • the fault-phase-to-ground voltage decreases, and the non-fault phase-to-ground voltage increases, and the line voltage is still symmetrical.
  • the grounding current is small, in order to ensure the reliability of power supply, it is allowed to run 1 ⁇ 2 hours.
  • the arc overvoltage of the non-fault phase it is easy to cause the breakdown of the weak part of the insulation, the saturation of the voltage transformer core, the system overvoltage, and the arc of the fault phase burns the cable, and is easy to cause personal electric shock accidents. Therefore, after the single-phase grounding It is necessary to isolate the single-phase ground fault of the faulty phase in time to ensure the safe and stable operation of the system and the reliability of power supply.
  • the purpose of the present invention is to provide a distributed grounding line selection system and method, which can solve the current problem of complicated wiring of small current grounding line selection devices, adopting communication methods to collect current, and solving the grounding line selection devices through a new transmission method The problem of high sampling rate transmission required.
  • the solution of the present invention is:
  • a distributed grounding line selection system includes a grounding line selection device and a zero-sequence current acquisition device corresponding to each branch, wherein the grounding line selection device and each zero-sequence current acquisition device are connected through a ring network, and each branch
  • the zero-sequence current acquisition device in the circuit is used to collect the zero-sequence current sampling value and switch information of the branch where it is located.
  • the collected data is sent to the grounding line selection device through the ring network, and the grounding line selection device completes the grounding line selection function.
  • the zero-sequence current collecting device is used to collect the three-phase current, zero-sequence current, circuit breaker position, and bus voltage of the branch, and send it to the grounding line selection device through the ring network; the zero-sequence current collecting device is set separately or shared branch
  • the existing protection device in the road realizes the protection function of the branch and also has the measurement and control function of the branch.
  • Each zero-sequence current acquisition device and grounding line selection device has at least two network ports, which are respectively connected to two adjacent devices.
  • the above-mentioned ring network analog quantity sampling value transmission rate is lower than the zero sequence current sampling rate of each branch zero sequence current acquisition device.
  • the zero sequence current sampling rate of each branch zero sequence current acquisition device is greater than 6000 points per second.
  • the switch quantity information of each branch required by the grounding line selection device and the analog quantity are transmitted in the same frame of message.
  • the trip mode adopted is issued by the ring network, issued by GOOSE, or output by hard contact.
  • the zero sequence current of each branch is transmitted in both directions through the ring network, and the normal operation of the system will not be affected if a network port or network cable is interrupted.
  • a distributed grounding line selection method includes the following steps: a grounding line selection device and a zero-sequence current collection device corresponding to each branch are set up, wherein the grounding line selection device and each zero-sequence current collection device pass through a ring network Connected, the zero sequence current acquisition device in each branch is used to collect the zero sequence current sampling value and switch information of the branch where it is located. The collected data is sent to the grounding line selection device through the ring network, and the grounding line selection device completes the grounding selection Line function.
  • the above-mentioned ring network analog quantity sampling value transmission rate is lower than the zero sequence current sampling rate of each branch zero sequence current acquisition device.
  • the trip mode adopted is issued by the ring network, issued by GOOSE, or output by hard contact.
  • the zero-sequence current of each branch is separately transmitted through the ring network in both directions. If a network port or network cable is interrupted, it will not affect the normal operation of the system.
  • the present invention reduces the on-site construction workload of the grounding line selection device and reduces the construction difficulty; for the grounding line selection device, the zero sequence current signal adopts digital input, so there is no need to configure conventional sampling in the grounding line selection device CT, the device volume is significantly reduced, the weight is significantly reduced, and it can be installed on the switch cabinet, saving on-site space.
  • Figure 1 is a schematic diagram of the wiring of a conventional low-current grounding line selection device
  • Figure 2 is a schematic diagram of the wiring of the distributed grounding line selection system of the present invention.
  • the present invention provides a distributed grounding line selection system and method, including a grounding line selection device and a zero-sequence current collection device corresponding to each branch, wherein the grounding line selection device and the bus
  • the zero sequence current acquisition devices of each branch are connected through a ring network.
  • the zero sequence current acquisition devices in each branch are used to collect the zero sequence current sampling value and switch information of the branch where they are located, and the collected data is sent through the ring network
  • the grounding line selection device completes the grounding line selection function; the zero-sequence current acquisition device can be set separately, or the existing protection device in the branch can be used to realize the function.
  • Each device (including the zero-sequence current acquisition device and the distributed grounding line selection device) has at least two network ports, which are connected to two adjacent devices in the ring network as shown in Figure 2; in order to improve the ring network Therefore, the transmission rate of the analog quantity sampling value of the ring network can only be maintained at an appropriate value.
  • the transmission rate is lower than the zero sequence current sampling rate of the zero sequence current acquisition device of each branch.
  • Two analog channels jointly transmit a zero sequence current to achieve high sampling rate data transmission.
  • the switching quantity information of each branch required by the grounding line selection device and the analog quantity are transmitted in the same frame of message.
  • the characteristic frequency of a ground fault may be as high as 3000 Hz, so the zero sequence current sampling rate of each branch zero sequence current acquisition device must be greater than 6000 points/sec.
  • the trip mode of the grounding line selection device after the line selection is completed supports three modes: issued by the ring network, issued by GOOSE, or output by hard contact.
  • the ring network in the present invention adopts high-reliability seamless redundancy specifications.
  • the distributed grounding line selection function will not be affected, and the normal operation of the system is ensured.
  • the distributed grounding system and method of the present invention solve the problems of complicated wiring of the current low-current grounding device, heavy weight, large volume, and inconvenient switchgear installation, and the object is 3kV-66kV low-current grounding system.
  • the zero-sequence CT signal of each branch on a busbar does not need to be connected to the grounding line selection device through the cable, but is connected to the integrated protection and monitoring device on the switchgear of this branch.
  • Each integrated protection and monitoring device is at least Equipped with two Ethernet ports, which are respectively connected to two devices of adjacent branches, and form a ring network with the grounding line selection device.
  • the zero sequence current sampling rate of each branch required by the device is not less than 9.6k, but the excessively high transmission speed will limit the number of devices in the ring network. Therefore, the device adopts 2.4 K transmission speed for SV data transmission, through the common transmission of 4 channels, to achieve high sampling rate data transmission.
  • the application frame message format is shown in Table 1 below.
  • the zero sequence current is I0
  • the 9.6k sampling values per second are respectively I00, I01, I02, I03, I04...I09599
  • the protection device of each branch in the ring network transmits the externally at a rate of 2.4k times per second.
  • Analog quantity, the sampling count corresponding to this 2.4k is 0 ⁇ 2399.
  • the values of channel 2 to channel 5 are respectively I00, I01, I02, I03; corresponding to sampling count 1, the values of channel 2 to channel 5 are respectively I04, I05, I06, I07; corresponding to sampling count 2, channel The values of channels 2 to 5 are I08, I09, I010, and I011; and so on, the corresponding sampling count is 2399, and the values of channels 2 to 5 are I09596, I09597, I09598, and I09599, respectively.
  • the two network ports of each branch protection measurement and control device are respectively connected to the adjacent devices, and the sending data is sent through the two network ports respectively.
  • the ring network adopts high-reliability seamless redundancy specifications for signal transmission, and one port of the forwarding node receives the report. The message immediately forwards the message from another port.
  • a port of the destination node receives a message, if it is the first time that the two ports of the node receive the frame message, then the frame message is extracted and sent, and at the same time, it continues to be transmitted along the ring network through another port; The port has received this frame message, then the frame message received by this port will be discarded and will not be forwarded at the same time; any network port or communication line is damaged, and the small current received data will not be lost.
  • the zero-sequence voltage required by the small-current grounding line selection device can be collected in a conventional way. After the zero-sequence voltage is started, the line selection is judged by all the synchronized zero-sequence currents. When the faulty branch is identified, the low-current grounding line selection device can cut off the faulty branch through three methods: ring network distribution, GOOSE distribution or hard contact output.

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  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

本发明公开一种分布式接地选线系统及方法，系统包括一台接地选线装置及对应各支路的零序电流采集装置，其中，接地选线装置与各零序电流采集装置之间通过环网连接，各支路中的零序电流采集装置用于采集所在支路的零序电流采样值及开关量信息，采集的数据通过环网发送给接地选线装置，由接地选线装置完成接地选线功能。此种技术方案可解决现在小电流接地选线装置接线复杂的问题，采用通信方式采集电流，并通过新的传输方式解决接地选线装置所需要的高采样率传输的难题。

Description

一种分布式接地选线系统及方法 技术领域
本发明属于电力系统的继电保护领域，特别涉及一种小电流接地系统单相接地故障选线的系统及方法。
背景技术
在3kV～66kV小电流接地系统中，单相接地是较为常见的故障类型。小电流接地系统发生单相接地时，故障相对地电压降低，非故障相对地电压升高，线电压依旧对称，此状态下，因接地电流很小，为了保证供电可靠性，可允许运行1～2小时。但是由于非故障相弧光过电压，易引起绝缘薄弱部分击穿、电压互感器铁芯饱和、系统过电压，以及故障相弧光烧毁电缆、易引发人身触电伤亡事故等问题，因此在单相接地后需要及时隔离故障相的单相接地故障，保障系统安全稳定运行及供电可靠性。
现有接地选线装置一般均为常规采样方式，如图1所示，需要将一段或多段母线各间隔(支路)的零序电流通过电缆接入小电流接地选线装置，所需电缆较多，现场接线困难，如母线间隔数太多，还可能由于小电流接地选线采样回路的限制而必须由多台装置实现；公开资料有尝试采用分布式接地选线的方式，但是主机与从机之间采用的是RS485或者GOOSE传输，这些方式无法将高采样率的零序电流传输给选线装置，选线准确率无法得到保证。
发明内容
本发明的目的，在于提供一种分布式接地选线系统及方法，其可解决现在小电流接地选线装置接线复杂的问题，采用通信方式采集电流，并通过新的传输方式解决接地选线装置所需要的高采样率传输的难题。
为了达成上述目的，本发明的解决方案是：
一种分布式接地选线系统，包括一台接地选线装置及对应各支路的零序电流 采集装置，其中，接地选线装置与各零序电流采集装置之间通过环网连接，各支路中的零序电流采集装置用于采集所在支路的零序电流采样值及开关量信息，采集的数据通过环网发送给接地选线装置，由接地选线装置完成接地选线功能。
上述零序电流采集装置用于采集本支路三相电流、零序电流、断路器位置、母线电压，通过环网发送给接地选线装置；所述零序电流采集装置单独设置，或共用支路中已有的保护装置，从而实现该支路保护功能，也具备该支路的测控功能。
各零序电流采集装置及接地选线装置均具有至少两个网口，分别与相邻的两台装置连接。
上述环网模拟量采样值传输速率低于各支路零序电流采集装置的零序电流采样率。
各支路零序电流采集装置的零序电流采样率大于6000点/秒。
上述接地选线装置所需的各支路开关量信息，与模拟量通过同一帧报文传输。
上述接地选线装置完成选线后，采用的跳闸方式为由环网下发、GOOSE下发或硬接点输出。
各支路零序电流通过环网双向传输，出现一个网口或网线中断的情况下，不会影响系统正常运行。
一种分布式接地选线方法，包含如下步骤：设置一台接地选线装置及对应各支路的零序电流采集装置，其中，接地选线装置与各零序电流采集装置之间通过环网连接，各支路中的零序电流采集装置用于采集所在支路的零序电流采样值及开关量信息，采集的数据通过环网发送给接地选线装置，由接地选线装置完成接地选线功能。
上述环网模拟量采样值传输速率低于各支路零序电流采集装置的零序电流采样率。
上述接地选线装置完成选线后，采用的跳闸方式为由环网下发、GOOSE下发或硬接点输出。
各支路零序电流通过环网的双向分别传输，出现一个网口或网线中断的情况下，不会影响系统正常运行。
采用上述方案后，本发明减少了接地选线装置现场施工工作量，降低了施工难度；对于接地选线装置而言，零序电流信号采用数字量输入，因此接地选线装置内无需配置常规采样CT，装置体积显著缩小，重量明显减轻，可以在开关柜上安装，节约了现场空间。
附图说明
图1是常规小电流接地选线装置的接线示意图；
图2是本发明分布式接地选线系统的接线示意图。
具体实施方式
以下将结合附图，对本发明的技术方案及有益效果进行详细说明。
如图2所示，本发明提供一种分布式接地选线系统及方法，包括一台接地选线装置及对应各支路的零序电流采集装置，其中，接地选线装置与本母线上的各个支路的零序电流采集装置之间通过环网连接，各支路中的零序电流采集装置用于采集所在支路的零序电流采样值及开关量信息，采集的数据通过环网发送给接地选线装置，由接地选线装置完成接地选线功能；其中的零序电流采集装置可以单独设置，也可以利用支路中已有的保护装置来实现功能。
每个装置(含零序电流采集装置及分布式接地选线装置)具有至少两个网口，配合图2所示，分别与环网中与之相邻的两台装置连接；为了提高环网中装置的数量，所以环网模拟量采样值传输速率只能保持在一个合适的值，其传输速率低于各支路零序电流采集装置的零序电流采样率，通过一帧报文中多个模拟量通道共同传输一个零序电流的方式实现高采样率数据的传输。
为了提高传输效率，接地选线装置所需的各支路开关量信息，与模拟量通过同一帧报文传输。接地故障的特征频率有可能高达3000Hz，所以各支路零序电流采集装置的零序电流采样率须大于6000点/秒。
所述接地选线装置完成选线后的跳闸方式支持由环网下发、GOOSE下发或硬接点输出三种方式。
本发明中的环网采用高可靠性无缝冗余规范，当出现一个网口或网线中断的 情况下，不会影响分布式接地选线功能，确保系统正常运行。
本发明的一种分布式接地系统及方法，解决目前小电流接地装置接线复杂、装置重量重、体积大、不便于开关柜安装的问题，其针对的对象为3kV～66kV小电流接地系统。如图2所示，一段母线上各支路的零序CT信号无需通过电缆接入接地选线装置，而是就近接入本支路开关柜上的综合保护测控装置，每台综合保护测控装置至少具备两个以太网口，分别与相邻支路的两台装置连接，并与接地选线装置组成一个环网。
为了提高接地选线装置选线准确性，装置所需的各支路零序电流采样率不低于9.6k，但过高的传输速度将会限制环网中的装置数量，因此，装置采用2.4k传输速度进行SV数据传输，通过4个通道共同传输的方式，实现高采样率数据的传输。应用帧报文格式如下表1所示。
表1 应用报文帧格式
Figure PCTCN2020076424-appb-000001
其中，APDU的数据格式定义如表2：
表2 APDU格式定义
Figure PCTCN2020076424-appb-000002
Figure PCTCN2020076424-appb-000003
如零序电流为I0，每秒9.6k采样值分别为I00、I01、I02、I03、I04……I09599；环网中每个支路的保护装置对外以每秒2.4k次的速率对外传输该模拟量，该2.4k对应的采样计数为0～2399。对应采样计数0，通道2～通道5的值分别为I00、I01、I02、I03；对应采样计数1，通道2～通道5的值分别为I04、I05、I06、I07；对应采样计数2，通道2～通道5的值分别为I08、I09、I010、I011；以此类推，对应采样计数2399，通道2～通道5的值分别为I09596、I09597、I09598、I09599。
各支路保护测控装置两个网口分别与相邻的装置相连，发送数据经过两个网口分别发送，环网采用高可靠性无缝冗余规范进行信号传输，转发节点一端口收到报文立即将报文从另一端口转发出去。目的节点一端口接收报文时，若为节点2个端口第1次收到此帧报文，那么提取此帧报文上送，同时通过另一端口继续沿着环网传送；若节点另一端口已经接收到过此帧报文，那么本端口接收的此帧报文将会被丢弃，同时不再转发；任一网口或通信线路损坏，小电流接收数据不受损失。
小电流接地选线装置所需的零序电压可通过常规方式采集，零序电压启动后，通过同步后的所有零序电流进行选线判别。当判别出故障支路后，小电流接地选 线装置可通过环网下发、GOOSE下发或硬接点输出三种方式切除故障支路。
以上实施例仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明保护范围之内。

Claims (12)

  1. 一种分布式接地选线系统，其特征在于：包括一台接地选线装置及对应各支路的零序电流采集装置，其中，接地选线装置与各零序电流采集装置之间通过环网连接，各支路中的零序电流采集装置用于采集所在支路的零序电流采样值及开关量信息，采集的数据通过环网发送给接地选线装置，由接地选线装置完成接地选线功能。
  2. 如权利要求1所述的一种分布式接地选线系统，其特征在于：所述零序电流采集装置单独设置，或共用支路中已有的保护装置。
  3. 如权利要求1所述的一种分布式接地选线系统，其特征在于：各零序电流采集装置及接地选线装置均具有至少两个网口，分别与相邻的两台装置连接。
  4. 如权利要求1所述的一种分布式接地选线系统，其特征在于：所述环网模拟量采样值传输速率低于各支路零序电流采集装置的零序电流采样率。
  5. 如权利要求4所述的一种分布式接地选线系统，其特征在于：各支路零序电流采集装置的零序电流采样率大于6000点/秒。
  6. 如权利要求1所述的一种分布式接地选线系统，其特征在于：所述接地选线装置所需的各支路开关量信息，与模拟量通过同一帧报文传输。
  7. 如权利要求1所述的一种分布式接地选线系统，其特征在于：所述接地选线装置完成选线后，采用的跳闸方式为由环网下发、GOOSE下发或硬接点输出。
  8. 如权利要求1所述的一种分布式接地选线系统，其特征在于：各支路零序电流通过环网双向传输，出现一个网口或网线中断的情况下，不会影响系统正常运行。
  9. 一种分布式接地选线方法，其特征在于：包含如下步骤：设置一台接地选线装置及对应各支路的零序电流采集装置，其中，接地选线装置与各零序电流采集装置之间通过环网连接，各支路中的零序电流采集装置用于采集所在支路的零序电流采样值及开关量信息，采集的数据通过环网发送给接地选线装置，由接地选线装置完成接地选线功能。
  10. 如权利要求9所述的一种分布式接地选线方法，其特征在于：所述环网模拟量采样值传输速率低于各支路零序电流采集装置的零序电流采样率。
  11. 如权利要求9所述的一种分布式接地选线方法，其特征在于：所述接地选线装置完成选线后，采用的跳闸方式为由环网下发、GOOSE下发或硬接点输出。
  12. 如权利要求9所述的一种分布式接地选线方法，其特征在于：各支路零序电流通过环网的双向分别传输，出现一个网口或网线中断的情况下，不会影响系统正常运行。
PCT/CN2020/076424 2019-03-12 2020-02-24 一种分布式接地选线系统及方法 Ceased WO2020181982A1 (zh)

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