WO2015000233A1 - 基于突变量阻抗原理的差动保护装置 - Google Patents

基于突变量阻抗原理的差动保护装置 Download PDF

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Publication number
WO2015000233A1
WO2015000233A1 PCT/CN2013/084568 CN2013084568W WO2015000233A1 WO 2015000233 A1 WO2015000233 A1 WO 2015000233A1 CN 2013084568 W CN2013084568 W CN 2013084568W WO 2015000233 A1 WO2015000233 A1 WO 2015000233A1
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Prior art keywords
gate
branch
differential protection
positive
output
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PCT/CN2013/084568
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English (en)
French (fr)
Inventor
文杰
曾铁军
Original Assignee
Wen Jie
Zeng Tiejun
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Publication of WO2015000233A1 publication Critical patent/WO2015000233A1/zh

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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
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices

Definitions

  • the present invention relates to a differential protection device, and more particularly to a differential protection device based on the principle of abrupt impedance. Background technique
  • the implementation of current differential protection can be roughly divided into two categories: amplitude comparison type current differential protection and phase comparison type current differential protection.
  • Amplitude comparison type differential protection (sampling value differential can also belong to this category).
  • the synchronization of each current amount involved in the differential is high, and the amount of data required is large; phase comparison type differential protection requires synchronization.
  • the use of electromagnetic transformer linear transmission zone can also reduce or even overcome the impact of CT saturation, but the traditional bus-connected current comparison type of bus differential protection and current phase comparison type of busbar protection for the presence of current faults in the region Powerless. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a differential protection device based on the principle of abrupt impedance, which has a small amount of data for communication transmission, low synchronization requirement, and does not refuse to move when there is an outflow current in a zone fault.
  • the technical solution of the present invention is: a differential protection device based on the principle of abrupt impedance, having n branches connected to the bus, each branch to a branch fault detection output unit,
  • the branch fault detection output unit includes a first AND gate, a second AND gate, a first OR gate, and a second OR gate, and the positive direction component action and the reverse direction component of each branch do not move through the first AND gate Output to the first OR gate, the positive direction component of each branch does not operate and the reverse direction component does not move through the second AND gate and outputs to the first OR gate, and the n first OR gates are simultaneously output to the third AND gate; n branches positive direction component action is simultaneously input to the second OR gate, and the second or gate output is output to the The third AND gate; the third AND gate outputs a differential protection action signal.
  • the device uses a sudden amount of impedance relay as the forward and reverse direction components, and sets the operating range from a fixed value. When the positive direction component of all the branches connected to the bus line does not operate, or the components in the forward and reverse directions do not operate, it can be judged as an area failure.
  • Grounding and phase-to-phase abrupt impedance components have equations of action such as equations (2) and (3)
  • the amount of data transmitted by the communication is small, the synchronization requirement is low, and the differential protection device does not refuse to move when there is an outflow current in the zone.
  • 1 is a circuit block diagram of a differential protection device based on the principle of abrupt impedance of the present invention.
  • Fig. 2 is a wiring diagram of a simulation system of a specific embodiment of a differential protection device based on the principle of abrupt impedance of the present invention. detailed description
  • a differential protection device based on the principle of abrupt impedance a differential protection device based on the principle of abrupt impedance, with n branches connected to the busbar, each branch to one branch a road fault detection output unit, the branch fault detection output unit includes a first AND gate, a second AND gate, a first OR gate, and a second OR gate, wherein the forward direction component action and the reverse direction component of each branch do not move through the first AND gate and output to the first OR gate, the positive direction of each branch The component does not move and the reverse component does not move through the second AND gate and outputs to the first OR gate, and the n first gates are simultaneously output to the third AND gate; n branches positive direction component action is simultaneously input to the second or The door, the second OR gate outputs to the third AND gate; the third AND gate outputs a differential protection action signal.
  • the positive and negative direction components adopt the same criterion form, and are respectively composed of grounding and phase-to-phase abrupt impedance direction component in "or" logic, that is, any component action, and the direction component is determined to operate.
  • the grounding and phase-to-phase abrupt impedance direction component motion equations are as shown in equations (2) and (3), respectively.
  • Branch 1 to branch ⁇ The forward direction of any branch is operated and is judged as a fault start.
  • the differential protection device operates.
  • the model uses the 500KV model.
  • Simulation ratio m prototype / model.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

一种基于突变量阻抗原理的差动保护装置，其中n条支路连接于母线上，每条支路对应一个支路故障检测输出单元。该支路故障检测输出单元包括第一与门、第二与门、第一或门和第二或门，每条支路的正方向元件动作和反方向元件不动作通过第一与门后输出到第一或门，每条支路的正方向元件不动作和反方向元件不动作通过第二与门后输出到第一或门，n个第一或门同时输出到第三与门；n条支路正方向元件动作同时输入到第二或门，第二或门输出到第三与门；第三与门输出差动保护动作信号。该装置以变量阻抗继电器作为正、反方向元件，并从定值上设定动作范围。当连接于母线上的所有支路的正方向元件动作、反方向元件不动作或正反方向元件都不动作，则可判为区内故障。

Description

说 明 书
基于突变量阻抗原理的差动保护装置 技术领域
本发明涉及一种差动保护装置， 尤其是一种基于突变量阻抗原理的差 动保护装置。 背景技术
电流差动保护的实现方式大致可以分两类： 幅值比较型电流差动保护 和相位比较型电流差动保护。 幅值比较型差动保护 （采样值差动也可归属 这一类） 对参与差动的各电流量的同步性要求高， 且需要的数据量大； 相 位比较型差动保护对同步性要求不高， 利用电磁式互感器线性传变区还可 以降低甚至克服 CT饱和的影响， 但是传统的母联电流比较式母差保护及 电流相位比较式母差保护对于区内故障存在流出电流的情形无能为力。 发明内容
本发明所要解决的技术问题是提供一种基于突变量阻抗原理的差动保 护装置， 通信传输的数据量小， 同步性要求低， 且当区内故障存在流出电 流情况时不会拒动。
为解决上述技术问题， 本发明的技术方案是： 一种基于突变量阻抗原 理的差动保护装置， 设有 n条支路连接与母线上， 每条支路对一个支路故 障检测输出单元， 所述支路故障检测输出单元包括第一与门、 第二与门、 第一或门和第二或门， 每条支路的正方向元件动作和反方向元件不动作通 过第一与门后输出到第一或门， 每条支路的正方向元件不动作和反方向元 件不动作通过第二与门后输出到第一或门， n个第一或门同时输出到第三 与门； n 条支路正方向元件动作同时输入到第二或门， 第二或门输出到第 三与门； 第三与门输出差动保护动作信号。 该装置以突变量阻抗继电器作 为正、 反方向元件， 并从定值上设定动作范围。 当连接于母线上的所有支 路的正方向元件动作、 反向元件不动作或正反方向元件都不动作， 则可判 为区内故障。
作为改进， 正、 反方向元件采用相同的判据形式。 具体形式： 接地和 相间突变量阻抗元件的动作方程分别如式 （2 ) 和式 （3 )
Figure imgf000004_0001
本发明与现有技术相比所带来的有益效果是：
通信传输的数据量小， 同步性要求低， 且当区内故障存在流出电流情 况时该差动保护装置不会拒动。 附图说明
图 1是本发明基于突变量阻抗原理的差动保护装置的电路框图。
图 2是本发明基于突变量阻抗原理的差动保护装置的具体实施算例的 一个仿真系统接线图。 具体实施方式
下面结合说明书附图对本发明作进一步说明。
如图 1所示， 一种基于突变量阻抗原理的差动保护装置， 一种基于突 变量阻抗原理的差动保护装置， 设有 η条支路连接与母线上， 每条支路对 一个支路故障检测输出单元， 所述支路故障检测输出单元包括第一与门、 第二与门、 第一或门和第二或门， 每条支路的正方向元件动作和反方向元 件不动作通过第一与门后输出到第一或门， 每条支路的正方向元件不动作 和反方向元件不动作通过第二与门后输出到第一或门， n 个第一或门同时 输出到第三与门； n 条支路正方向元件动作同时输入到第二或门， 第二或 门输出到第三与门； 第三与门输出差动保护动作信号。 正、 反方向元件采 用相同的判据形式， 分别由接地和相间突变量阻抗方向元件按 "或"逻辑 组成， 即任一元件动作， 判该方向元件动作。 接地和相间突变量阻抗方向 元件的动作方程分别如式 （2 ) 和式 （3 )
Figure imgf000005_0001
支路 1至支路 η任一支路的正方向元件动作， 判为故障启动。 连接于 母线的支路广 η均检测到故障， 同时故障启动， 则该差动保护装置动作。
如图 2所示， 具体算例： 模型采用 500KV模型。 模拟比 m=原型 /模型。 功率模拟比： mp=100MVA/lKW =100000。 电压模拟比： mu=525KV/800V =656. 25 。 ft02 、 #06 发 电 机 ： S=15KVA， Ue=460/230， Φ =0. 8, Xd=0. 5Xq=0. 132, X2=0. 118 无穷大系统阻抗： Zl=l. 25+j4. 0 , Z0=6. 15+j l l. 升压变 Bl、 B2 : Ue=800/210， Uk=12%。 限流电抗器 Zk: Z=7. 9 Z 750 (13. 9 Z 750) 。 线路阻抗： L=260Km， Zl=l. 26+j l7. 4， Z0=12. 168+j42. 42。模拟变 B: Ue=800/400， Uk=14%。 PT变比： 800/100/100/ CT变比： 10A/5A。 电流： ft21CT: I la、 I lc。 当模拟区内故障， 故障电流流出时， 为 K1故障， 在断路器 21至 K1之 间设置一个接触电阻 50欧姆，断路器 42支路模拟一条短线路阻抗: L=20Km， Zl=1. 26+j l7. 4, Z0=12. 168+j42. 42。该支路的突变量阻抗元件的定值取为 20 欧姆 （接地和相间阻抗都取这个值）， 结果表明该支路正方向接地和相 间阻抗元件都不动作，整个母线保护能正确动作。另外在转换性故障， K6AN →K1BN、 K6BN→K1CN、 K6AN→K1BCN、 K6AN→K2BN、 K6BN→K2CN、 K6AN→K2BCN、 K1AN→K1BN、 K1BN→K1CN、 K1AN→K1BCN、 K2AN→K2BNK1 时保护均能正确 动作。

Claims

权利 要 求 书
1. 一种基于突变量阻抗原理的差动保护装置， 其特征在于： 设有 n条支路 连接与母线上， 每条支路对一个支路故障检测输出单元， 所述支路故障 检测输出单元包括第一与门、 第二与门、 第一或门和第二或门， 每条支 路的正方向元件动作和反方向元件不动作通过第一与门后输出到第一 或门，每条支路的正方向元件不动作和反方向元件不动作通过第二与门 后输出到第一或门， n个第一或门同时输出到第三与门； n条支路正方 向元件动作同时输入到第二或门， 第二或门输出到第三与门； 第三与门 输出差动保护动作信号。
2. 根据权利要求 1所述的一种基于突变量阻抗原理的差动保护装置，其特 征在于： 该装置以突变量阻抗继电器作为正、 反方向元件， 并从定值上 设定动作范围。 接地和相间突变量阻抗元件的动作方程分别如式 （2 ) 和式 （3 ) :
Figure imgf000007_0001
PCT/CN2013/084568 2013-07-04 2013-09-29 基于突变量阻抗原理的差动保护装置 WO2015000233A1 (zh)

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