技术领域technical field
本发明涉及一种智能弧光保护系统，属于变电、配电及用电领域。The invention relates to an intelligent arc protection system, which belongs to the field of power transformation, power distribution and power utilization.
背景技术Background technique
弧光短路是配电网中最严重的故障，尤其是发生在中、低压开关柜内部的情形。由于电弧电阻较大，短路电流往往达不到过流、速断整定值，因而不能快速动作而切断故障。电弧持续燃烧释放出巨大的能量，从而造成灾难性的后果，开关柜被严重烧毁。另外，开关柜的弧光短路故障，往往得不到及时清除，发展为中压母线故障，其危害是非常严重的。快速检测到事故发生时产生的弧光，通过对弧光判断分析，快速切除故障，是解决上述问题的最好方法。Arcing short circuits are the most serious faults in distribution networks, especially when they occur inside medium and low voltage switchgears. Due to the large arc resistance, the short-circuit current often does not reach the over-current and quick-break setting values, so it cannot act quickly to cut off the fault. The continuous combustion of the arc released huge energy, which caused catastrophic consequences, and the switchgear was severely burned. In addition, the arc short-circuit fault of the switchgear is often not cleared in time, and develops into a medium-voltage bus fault, which is very harmful. The best way to solve the above problems is to quickly detect the arc light generated when the accident occurs, and quickly remove the fault through the judgment and analysis of the arc light.
近年来，针对中低压母线的弧光保护系统应用的越来越多，其动作时间短(一般<7ms)，远低于传统保护，当母线发生弧光事件时，能够迅速有效地切除故障线路，保障线路安全、稳定地运行。然而，由于弧光通道数目较多，接线较为复杂，一般的弧光保护系统只能保护一到两段母线，当系统于多段母线运行时，需要多套保护系统，而且弧光保护通常不具有选择性跳闸功能，往往会扩大故障范围，带来不必要的经济损失。一般的弧光保护系统，安装于开关柜现场扩展模块都不带显示，调试的时候要在现场施加弧光信号，然后在远端主控单元上查看是否检测到弧光，需要多人配合，也给现场调试带来了诸多不便。In recent years, more and more arc protection systems for medium and low-voltage buses have been applied. Its action time is short (generally <7ms), which is far lower than traditional protection. The line runs safely and stably. However, due to the large number of arc channels and complicated wiring, the general arc protection system can only protect one or two sections of busbars. When the system operates on multiple busbars, multiple sets of protection systems are required, and arc protection usually does not have selective tripping Function, often expand the scope of failure, resulting in unnecessary economic losses. The general arc protection system does not have a display when it is installed in the on-site expansion module of the switch cabinet. When debugging, it is necessary to apply an arc signal on the site, and then check whether the arc is detected on the remote main control unit. Debugging brings a lot of inconvenience.
发明内容Contents of the invention
针对现有技术中存在的不足，为方便设计和现场施工，降低系统成本，本发明提供了一套智能弧光保护系统，包含两种单元，一种是弧光主控单元，另一种是弧光扩展单元。In view of the deficiencies in the prior art, in order to facilitate design and on-site construction, and reduce system costs, the present invention provides a set of intelligent arc protection system, which includes two units, one is the arc main control unit, and the other is the arc extension unit.
本发明解决现有技术问题所采用的技术方案是：一种弧光保护系统主控单元，智能识别通道序号、通过保护配置能够实现选择性跳闸，包括电源板、主板、通讯管理板、显示板、弧光主控板、开出板、模拟量板，本主控单元采用插接式结构，各个板件集成各项独立的功能，直接插入机箱构成一套完整的主控单元。The technical solution adopted by the present invention to solve the existing technical problems is: a main control unit of the arc protection system, which intelligently recognizes the channel number and can realize selective tripping through protection configuration, including a power board, a main board, a communication management board, a display board, Arc light main control board, output board, analog quantity board, the main control unit adopts a plug-in structure, each board integrates various independent functions, and is directly inserted into the chassis to form a complete set of main control unit.
上述主控单元，所述主板由MCU、FPGA、Flash、AD采样电路组成；所述通讯管理板由MCU、通讯电路组成；所述显示板包括LCD液晶和人机接口板(按键及接口电路)组成；所述弧光主控板由MCU和FPGA组成；所述开出板由各开出继电器组成；所述模拟量板由电压电流传感器组成；所述电源板由提供单元工作的电源模块和开入量输入模块组成。Above-mentioned main control unit, described main board is made up of MCU, FPGA, Flash, AD sampling circuit; Described communication management board is made up of MCU, communication circuit; Described display board comprises LCD liquid crystal and man-machine interface board (button and interface circuit) Composition; the arc main control board is composed of MCU and FPGA; the output board is composed of each output relay; the analog quantity board is composed of voltage and current sensors; Composition of input module.
主控单元各模块的功能作用及信号传输情况如下：The functions and signal transmission of each module of the main control unit are as follows:
电网一次设备电压、电流经互感器转换后，电压和电流信号经主控单元的模拟量板变换成弱电信号，输入到主板，经运算放大器、A/D转换器转换为数字量，再通过FPGA进行处理、传输给MCU运算得到相应的电压电流值；After the voltage and current of primary equipment in the power grid are converted by transformers, the voltage and current signals are transformed into weak current signals by the analog quantity board of the main control unit, input to the main board, converted into digital quantities by operational amplifiers and A/D converters, and then passed through FPGA Process and transmit to the MCU for calculation to obtain the corresponding voltage and current values;
电源及开入量板的开入量输入模块接收外部开关量信号，开入信号经主板FPGA滤波处理后发送给主板MCU；The binary input module of the power supply and the binary input board receives the external switching signal, and the binary input signal is sent to the mainboard MCU after being filtered by the motherboard FPGA;
主板MCU采集各电气量和弧光信号，实现弧光保护的逻辑判断；The mainboard MCU collects various electrical quantities and arc signals to realize the logical judgment of arc protection;
人机接口板的操作按键直接由主板FPGA和MCU进行控制，主板MCU根据所有采集来的信号进行逻辑运算，并输出LED指示信号，将各种信号的测量值、保护动作值、定值整定通过LCD显示出来；The operation buttons of the man-machine interface board are directly controlled by the main board FPGA and MCU. The main board MCU performs logic operations according to all collected signals, and outputs LED indication signals, and the measured values, protection action values and fixed values of various signals are set through LCD display;
通讯管理板通过光电隔离的通讯接口进行远方通讯，实现遥测、遥信、遥控、遥调，和/或实现定值的远方整定及查询、远方保护投退；The communication management board conducts remote communication through the communication interface of photoelectric isolation, realizes telemetry, remote signaling, remote control, remote adjustment, and/or realizes remote setting and query of fixed value, remote protection switch-on and withdrawal;
弧光主控板接收弧光信号，处理后输入主板，主板上的FPGA接收弧光信号，并对信号进行滤波处理后再传输给MCU。The arc light main control board receives the arc light signal, processes it and inputs it to the main board, and the FPGA on the main board receives the arc light signal, filters the signal and then transmits it to the MCU.
所述的主控单元中弧光保护判据可以为弧光单判据或者弧光和电流双判据，后者能够增加保护动作的可靠性。为弧光单判据时，主控单元检测到有弧光信号时保护动作；为双判据时，主控单元检测到弧光信号的同时，判断模拟量板的电流信号是否有突变，如果两个条件都满足，保护动作。The arc protection criterion in the main control unit can be arc single criterion or arc and current double criterion, the latter can increase the reliability of protection action. When it is an arc single criterion, the main control unit detects an arc signal and the protection action; when it is a double criterion, when the main control unit detects an arc signal, it judges whether there is a sudden change in the current signal of the analog quantity board. If the two conditions All satisfied, take protective action.
所述的主控单元能够智能识别弧光通道序号，各块弧光采集板可以设置地址，无论后端接线如何，主控单元都能够按照设置好的地址将传输过来的弧光信号按照地址序号排列。The main control unit can intelligently identify the serial number of the arc channel, and each arc acquisition board can be set with an address. No matter what the back-end wiring is, the main control unit can arrange the transmitted arc signals according to the address serial number according to the set address.
本发明的另一个目的，提供一种智能弧光保护系统弧光保护系统扩展单元，用于检测现场弧光信号，并将采集来的弧光信号处理后发送给主控单元，包括电源板、主板、显示板、弧光采集板以及现场的弧光探头。扩展单元采用插接式结构，各个板件集成各项独立的功能，直接插入机箱构成一套完整的单元。Another object of the present invention is to provide an intelligent arc protection system arc protection system expansion unit, which is used to detect the on-site arc signal, and send the collected arc signal to the main control unit after processing, including a power board, a main board, and a display board , arc light acquisition board and on-site arc light probe. The expansion unit adopts a plug-in structure, and each board integrates various independent functions, and is directly inserted into the chassis to form a complete unit.
本发明同时公开了一种弧光保护系统，包括弧光主控单元和弧光扩展单元。弧光扩展单元通过塑料光纤与弧光探头相连，采集现场弧光信号，对采集的弧光信号进行打码处理后，发送给弧光主控单元。弧光主控单元通过光纤连接弧光扩展单元，接收扩展单元处理后的弧光信号，并根据传输信息中的地址码对弧光信号进行重新编号，实现事件记录、保护逻辑处理等功能。The invention also discloses an arc light protection system, which includes an arc light main control unit and an arc light extension unit. The arc light extension unit is connected to the arc light probe through plastic optical fiber, collects the on-site arc light signal, codes the collected arc light signal, and sends it to the arc light main control unit. The arc main control unit is connected to the arc extension unit through an optical fiber, receives the arc signal processed by the extension unit, and renumbers the arc signal according to the address code in the transmission information, and realizes functions such as event recording and protection logic processing.
上述扩展单元，用户可以通过显示板对各个弧光通道单独设置编号，查看弧光信号状态等；弧光采集板通过弧光探头采集现场弧光信号，主板以总线方式读取弧光信号，进行打码处理，将打码后的弧光信号发送出去；电源板为各个板件提供工作电源。For the above-mentioned expansion unit, the user can individually set the number of each arc channel through the display board, check the status of the arc signal, etc.; The coded arc signal is sent out; the power board provides working power for each board.
该智能弧光保护系统信号传递的主要过程如下：The main process of signal transmission of the intelligent arc protection system is as follows:
弧光扩展单元通过塑料光纤与弧光探头相连，采集现场弧光信号，对采集的弧光信号进行打码处理后，发送给弧光主控单元。弧光主控单元通过光纤连接弧光扩展单元，接收扩展单元处理后的弧光信号，并根据传输信息中的地址码对弧光信号进行重新编号，实现事件记录、保护逻辑处理等功能。The arc light extension unit is connected to the arc light probe through plastic optical fiber, collects the on-site arc light signal, codes the collected arc light signal, and sends it to the arc light main control unit. The arc main control unit is connected to the arc extension unit through an optical fiber, receives the arc signal processed by the extension unit, and renumbers the arc signal according to the address code in the transmission information, and realizes functions such as event recording and protection logic processing.
上述扩展单元弧光探头直接安装在母排室，监测母排室的弧光状况，通过塑料光纤将采集信号发送给弧光采集板。采集板经过自带的MCU处理后对弧光信号增加地址码和校验，通过光纤接口发送到弧光主控板，主控单元能够智能识别弧光通道序号，无论后端接线如何，主控单元都能够按照设置好的地址将传输过来的弧光信号按照地址序号排列。同时采集板直接与扩展单元的主板进行交互，使弧光信号在扩展单元本地也可以通过显示模块查看到。The above-mentioned extension unit arc probe is directly installed in the busbar room to monitor the arc status of the busbar room, and sends the acquisition signal to the arc acquisition board through the plastic optical fiber. After processing by the built-in MCU, the acquisition board adds address code and verification to the arc light signal, and sends it to the arc light main control board through the optical fiber interface. The main control unit can intelligently identify the serial number of the arc light channel. Arrange the transmitted arc light signals according to the address serial number according to the set address. At the same time, the acquisition board directly interacts with the main board of the expansion unit, so that the arc signal can be viewed locally on the expansion unit through the display module.
用户还可以通过显示模块和操作面板对弧光采集板进行地址配置，配置完后弧光采集板所发出的弧光信号即自带地址编号。所述的主控单元能够智能识别弧光通道序号，各块弧光采集板可以设置地址，无论后端接线如何，主控单元都能够按照设置好的地址将传输过来的弧光信号按照地址序号排列。The user can also configure the address of the arc collection board through the display module and the operation panel. After configuration, the arc signal sent by the arc collection board has its own address number. The main control unit can intelligently identify the serial number of the arc channel, and each arc acquisition board can be set with an address. No matter what the back-end wiring is, the main control unit can arrange the transmitted arc signals according to the address serial number according to the set address.
上述种智能弧光保护系统中，扩展单元可以根据实际需要，灵活的增加或较少。In the above-mentioned intelligent arc protection system, the expansion units can be flexibly increased or decreased according to actual needs.
所述的主控单元弧光保护可以任意关联弧光通道和电流通道，可以任意设置保护出口；失灵保护可以任意关联弧光保护和电流通道，也可以任意设置保护出口，增加了保护的灵活性。合理的配置保护关联量可以实现选择性跳闸功能。The arc protection of the main control unit can be arbitrarily associated with the arc channel and the current channel, and the protection outlet can be arbitrarily set; the failure protection can be arbitrarily associated with the arc protection and the current channel, and the protection outlet can be arbitrarily set, which increases the flexibility of protection. Selective tripping can be realized by properly configuring the protection correlation quantity.
主控单元检测到光纤通道连接中断后，自行闭锁与该弧光信号相关联的弧光保护。扩展单元的弧光采集板每隔一个时间周期发送一次弧光信号，主控单元主板接收到该采集板的数据并判断正常后，通讯正常计数器加1，当通讯正常计数器连续几个时间周期不变，判断该采集通道通讯异常。主控单元的主板MCU从内存区中查找出与该通道弧光信号关联的弧光保护，立即闭锁保护功能。After the main control unit detects that the fiber channel connection is interrupted, it automatically blocks the arc protection associated with the arc signal. The arc light acquisition board of the expansion unit sends an arc light signal every other time period. After the main control unit main board receives the data of the acquisition board and judges it is normal, the communication normal counter is incremented by 1. When the communication normal counter remains unchanged for several consecutive time periods, It is judged that the communication of the acquisition channel is abnormal. The main board MCU of the main control unit finds the arc protection associated with the arc signal of the channel from the memory area, and immediately blocks the protection function.
上述扩展单元可以根据实际需要，灵活的增加或较少弧光采集板数目，并且板件位置可以任意配置。The above expansion unit can flexibly increase or decrease the number of arc collection plates according to actual needs, and the positions of the plates can be arbitrarily configured.
上述扩展单元，中弧光采集板采集现场弧光信号，通过光纤接口与主控单元弧光主控板通讯。The above-mentioned expansion unit and the middle arc light collection board collect on-site arc light signals, and communicate with the arc light main control board of the main control unit through the optical fiber interface.
上述扩展单元现场检测弧光信号的弧光探头与弧光采集板之间通过专用塑料光纤连接。The arc probe for on-site detection of the arc signal of the above-mentioned expansion unit is connected with the arc acquisition board through a special plastic optical fiber.
本发明提供另一种智能弧光保护系统，以上所述的弧光主控单元中不使用弧光主控板，直接采用弧光采集板和弧光采集探头；探头采集到弧光信号后，通过塑料光纤将弧光信号传输给弧光采集板，经弧光采集板MCU处理后传输给主控单元主板。The present invention provides another intelligent arc light protection system. The above-mentioned arc light main control unit does not use the arc light main control board, but directly uses the arc light collection board and the arc light collection probe; It is transmitted to the arc light collection board, and after being processed by the MCU of the arc light collection board, it is transmitted to the main control unit main board.
扩展单元开关柜就地安装，主控单元可以就地安装也可以组屏安装，保障中低压母线的安全运行，是构成智能电网的理想元件。The switchgear of the extension unit is installed on site, and the main control unit can be installed on site or in a panel to ensure the safe operation of the medium and low voltage busbars. It is an ideal component for forming a smart grid.
本发明的有益效果：Beneficial effects of the present invention:
本发明提供的弧光保护系统的主控单元的弧光保护配置灵活，可以任意关联弧光通道和电流通道，可以任意设置保护出口，增加了保护的灵活性。合理的配置保护关联量可以同时保护多段母线，不要多套保护系统，降低了系统成本。也能够实现选择性跳闸功能，减少大面积跳闸带来的损失。The arc protection configuration of the main control unit of the arc protection system provided by the present invention is flexible, the arc channel and the current channel can be arbitrarily associated, and the protection outlet can be set arbitrarily, which increases the flexibility of protection. Reasonable allocation of protection correlation can protect multi-section busbars at the same time, without multiple protection systems, which reduces system cost. It can also realize the selective tripping function and reduce the loss caused by large-scale tripping.
本发明提供的弧光保护系统的扩展单元的弧光采集板可以自行设置地址码，当弧光通道数目较多时，省去了记录线号，并按照顺序对应着接线的烦恼，只需将弧光采集板的输出端口接入主控板的任一接收口，主控单元即可根据传输过来采集板的地址码对弧光通道进行顺序识别，简化了接线过程，提高了现场施工的效率。The arc collection board of the expansion unit of the arc protection system provided by the present invention can set the address code by itself. When the number of arc channels is large, it saves the need to record the line number and corresponds to the trouble of wiring in order. The output port is connected to any receiving port of the main control board, and the main control unit can sequentially identify the arc channels according to the address code transmitted from the acquisition board, which simplifies the wiring process and improves the efficiency of on-site construction.
本发明提供的弧光保护系统的动作时间较短，当动作逻辑选为弧光时从弧光发生到保护出口能够控制在4ms内，迅速准确地切断故障母线，有效的防止事故扩散。The action time of the arc protection system provided by the present invention is relatively short, and when the action logic is selected as arc, it can be controlled within 4ms from the occurrence of the arc to the protection exit, cut off the faulty bus quickly and accurately, and effectively prevent the accident from spreading.
本发明提供的弧光保护系统当传输弧光数据的光纤通道通讯异常时，保护系统能够识别出异常的通道，发出告警同时闭锁与之相关联的保护，降低了错误报警的情况。In the arc protection system provided by the present invention, when the communication of the optical fiber channel for transmitting arc data is abnormal, the protection system can identify the abnormal channel, issue an alarm and block the protection associated with it, reducing the situation of false alarms.
本发明提供的弧光保护系统的主控单元可以与多台扩展单元配合使用，扩展单元与主控单元之间采用光纤通讯，有效通讯距离较长，且电气抗干扰性高。The main control unit of the arc protection system provided by the present invention can be used in cooperation with multiple expansion units, and optical fiber communication is adopted between the expansion units and the main control unit, the effective communication distance is long, and the electrical anti-interference performance is high.
本发明提供的弧光保护系统的主控单元的弧光动作逻辑可设，可以选择为弧光条件满足时动作或者选择为弧光与电流条件均满足时动作，后者提高了弧光保护动作的可靠性。The arc light action logic of the main control unit of the arc light protection system provided by the present invention can be set, and can be selected to act when the arc light condition is met or to act when both the arc light and current conditions are met. The latter improves the reliability of the arc light protection action.
本发明扩展单元开关柜就地安装，主控单元可以就地安装也可以组屏安装，保障中低压母线的安全运行，是构成智能电网的理想元件。The expansion unit switch cabinet of the present invention is installed on site, and the main control unit can be installed on site or can be installed in a panel to ensure the safe operation of the medium and low voltage busbars, and is an ideal component for forming a smart grid.
附图说明Description of drawings
图1为本发明中主控单元的结构框图。Fig. 1 is a structural block diagram of the main control unit in the present invention.
图2为本发明中扩展单元的结构框图。Fig. 2 is a structural block diagram of the expansion unit in the present invention.
图3为本发明的保护系统内部接线图。Fig. 3 is an internal wiring diagram of the protection system of the present invention.
图4为本发明的典型保护方案示意图。Fig. 4 is a schematic diagram of a typical protection scheme of the present invention.
具体实施方式detailed description
以下结合附图通过具体实施例对本发明的技术方案做进一步的说明。The technical solutions of the present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.
实施例1Example 1
本发明所述的弧光保护系统由一个主控单元和若干个扩展单元组成。The arc protection system of the present invention is composed of a main control unit and several expansion units.
如图1所示，弧光保护系统主控单元，包括电源及开入量板、主板、通讯管理板、人机接口板、弧光主控板、模拟量板。所述的主板是由MCU、FPGA、Flash、AD采样电路等组成；所述的通讯管理板是由MCU、通讯电路组成；所述的人机接口板由LCD液晶和按键及接口电路组成；所述的弧光主控板由MCU和FPGA组成；所述的模拟量板由电压电流传感器组成；电源及开入量板由提供单元工作的电源模块和开入量输入模块组成。As shown in Figure 1, the main control unit of the arc protection system includes a power supply and binary input board, a main board, a communication management board, a man-machine interface board, an arc main control board, and an analog board. Described main board is made up of MCU, FPGA, Flash, AD sampling circuit etc.; Described communication management board is made up of MCU, communication circuit; Described man-machine interface board is made up of LCD liquid crystal and button and interface circuit; So The above-mentioned arc main control board is composed of MCU and FPGA; the above-mentioned analog quantity board is composed of voltage and current sensors; the power supply and binary input quantity board is composed of a power supply module and a binary input quantity input module for providing unit work.
电网一次设备电压、电流经互感器转换后，电压和电流信号经主控单元的模拟量板变换成弱电信号，输入到主板，经运算放大器、A/D转换器转换为数字量，再通过FPGA进行处理、传输给MCU运算得到相应的电压电流值。After the voltage and current of primary equipment in the power grid are converted by transformers, the voltage and current signals are transformed into weak current signals by the analog quantity board of the main control unit, input to the main board, converted into digital quantities by operational amplifiers and A/D converters, and then passed through FPGA It is processed and transmitted to the MCU for calculation to obtain the corresponding voltage and current values.
电源及开入量板的开入量输入模块接收外部开关量信号(如断路器状态)，开入信号经主板FPGA滤波处理后发送给主板MCU；主板MCU采集各电气量和弧光信号，实现弧光保护的逻辑判断。The binary input module of the power supply and the binary input board receives the external switching signal (such as the state of the circuit breaker), and the input signal is sent to the mainboard MCU after being filtered by the motherboard FPGA; the mainboard MCU collects each electrical quantity and arc signal to realize arc light Logical judgment of protection.
人机接口板的操作按键直接由主板FPGA和MCU进行控制，主板MCU根据所有采集来的信号进行逻辑运算，并输出LED指示信号，将各种信号的测量值、保护动作值、定值整定通过LCD显示出来。The operation buttons of the man-machine interface board are directly controlled by the main board FPGA and MCU. The main board MCU performs logic operations according to all collected signals, and outputs LED indication signals, and the measured values, protection action values and fixed values of various signals are set through LCD display.
通讯管理板通过光电隔离的通讯接口可进行远方通讯，可实现遥测、遥信、遥控、遥调，并可实现定值的远方整定及查询、远方保护投退等功能。The communication management board can carry out remote communication through the communication interface of photoelectric isolation, and can realize telemetry, remote signaling, remote control, remote adjustment, and can realize remote setting and query of fixed value, remote protection switch-on and withdrawal and other functions.
弧光主控板接收来自弧光采集板传输过来的弧光数据，该数据采用光信号传输，抗干扰性强，弧光主控板自带MCU，接收到数据后能够识别该数据所对应的弧光序号，处理后直接输入主板。The arc light main control board receives the arc light data transmitted from the arc light acquisition board. The data is transmitted by optical signal, which has strong anti-interference. The arc light main control board has its own MCU. Then directly enter the motherboard.
如图2所示，弧光保护系统扩展单元，包括电源板、主板、人机接口板、弧光采集板以及现场的弧光探头。As shown in Figure 2, the arc protection system expansion unit includes a power board, a main board, a man-machine interface board, an arc collection board, and an on-site arc probe.
弧光探头直接安装在母排室，监测母排室的弧光状况，通过塑料光纤将采集信号发送给弧光采集板，弧光采集板经过自带的MCU处理后一方面对弧光信号增加地址码和校验，通过光纤接口发送到主控单元弧光主控板，另一方面直接与扩展单元的主板进行交互，使弧光信号在扩展单元本地也可以通过显示模块查看到。用户可以通过人机接口板对弧光采集板进行地址配置，配置完后弧光采集板所发出的弧光信号即自带地址编号。The arc probe is directly installed in the busbar room to monitor the arc status of the busbar room, and the acquisition signal is sent to the arc acquisition board through the plastic optical fiber. After the arc acquisition board is processed by its own MCU, the arc signal is added to the address code and verified. , through the optical fiber interface to the main control unit arc main control board, on the other hand directly interact with the main board of the expansion unit, so that the arc signal can also be viewed locally through the display module in the expansion unit. The user can configure the address of the arc light acquisition board through the man-machine interface board. After configuration, the arc light signal sent by the arc light acquisition board has its own address number.
弧光扩展单元能够对本装置上各个弧光采集板进行地址配置，配置完后地址数据固化在扩展单元主板的FLASH中，掉电不丢失。The arc extension unit can configure the address of each arc acquisition board on the device. After configuration, the address data is solidified in the FLASH of the extension unit main board, and will not be lost when power is off.
弧光探头检测探头端面上的光强强度(单位为Lux)，当照射到该端面上的光强大于动作阈值时，弧光采集板认为该检测位置发生了弧光。The arc light probe detects the light intensity (unit is Lux) on the end face of the probe. When the light intensity irradiated on the end face is greater than the action threshold, the arc light collection board considers that an arc light has occurred at the detection position.
扩展单元弧光采集板使用塑料光纤与弧光探头相连接，实时监测弧光信号，板上的MCU对接收到的弧光信号进行滤波处理(滤波时间可设，一般为300～500us)后，加入本块采集板的地址和校验码，使用高速串行方式，以光信号将弧光信号发送到主控单元弧光主控板；同时，采集板MCU通过并行总线将弧光信号传输给弧光扩展单元的主板，通过显示模块在扩展单元本地显示出来并记录弧光信号事件。The expansion unit arc light collection board uses plastic optical fiber to connect with the arc light probe to monitor the arc light signal in real time. The MCU on the board filters the received arc light signal (filtering time can be set, generally 300~500us), and then joins this block to collect The address and check code of the board use high-speed serial mode to send the arc signal to the main control unit arc main control board with optical signal; at the same time, the acquisition board MCU transmits the arc signal to the main board of the arc expansion unit through the parallel bus. The display module displays and records arc signal events locally on the expansion unit.
主控单元弧光主控板接收采集板发送过来的光信号后，通过转换芯片转换成电信号传输给弧光主控板MCU，解析数据帧中的地址码和校验码，将主控板上6个端口共30个弧光信号重新按照地址码组合后传输给主控单元的主板，主板接收所有弧光主控板传输的弧光信号，再按照数据中的地址给弧光信号编号，就实现了弧光通道的智能识别。After the main control unit arc light main control board receives the optical signal sent by the acquisition board, it converts it into an electrical signal through the conversion chip and transmits it to the arc light main control board MCU, analyzes the address code and check code in the data frame, and converts the 6 A total of 30 arc signals from each port are recombined according to the address code and then transmitted to the main board of the main control unit. Intelligent Recognition.
本发明弧光保护系统智能识别通道号实现过程：The realization process of the intelligent identification channel number of the arc protection system of the present invention:
弧光采集板可以设置地址编号，只需要将每个采集板上的5个采集探头按序接入到弧光采集板，然后在扩展单元上将该采集板的地址设置好；采集板的光纤口与主控板相连时只要接入任意一接口即可，不需要按实际编号接入。程序自动识别采集板传输过来的弧光信号地址，对弧光序号进行编号，省去了接线的麻烦。The arc acquisition board can set the address number, you only need to connect the five acquisition probes on each acquisition board to the arc acquisition board in sequence, and then set the address of the acquisition board on the expansion unit; the optical fiber port of the acquisition board and When the main control board is connected, it only needs to be connected to any interface, and it does not need to be connected according to the actual number. The program automatically recognizes the address of the arc signal transmitted by the acquisition board, and numbers the serial number of the arc, saving the trouble of wiring.
通过保护配置实现多段母线弧光保护和选择性跳闸：Realize multi-section busbar arc protection and selective tripping through protection configuration:
主控单元的弧光保护数目较多，具有8组弧光保护，每组保护逻辑独立，可以灵活配置关联的弧光信号和保护电流。弧光发生时，会伴随着电流的突然增加，所以本弧光保护系统增加了一个电流突变的启动条件，以增强弧光保护的动作准确性。主控单元可以采集最多四条线路的三相电流，每组弧光保护均可以选择关联这四组电流中的任意一组或多组。本发明可以通过配置弧光保护的电流和弧光关联参数实现对多段母线的选择性跳闸。The main control unit has a large number of arc protections, with 8 groups of arc protections, each group of protection logic is independent, and the associated arc signals and protection current can be flexibly configured. When an arc occurs, it will be accompanied by a sudden increase in current, so this arc protection system adds a starting condition for a sudden change in current to enhance the action accuracy of arc protection. The main control unit can collect three-phase currents of up to four lines, and each group of arc protection can choose to associate with any one or more of these four groups of currents. The present invention can realize the selective tripping of multi-segment buses by configuring the current and arc-related parameters of arc protection.
正常工作中，主控单元能够检测弧光采集信号的光纤通道通断，检测到光纤通道连接中断后，自行闭锁与该弧光信号相关联的弧光保护。扩展单元的弧光采集板每100us发送一次弧光信号，主控单元主板接收到该采集板的数据并判断正常后，通讯正常计数器加1，当通讯正常计数器连续500us不变，即连续5次数据不正常，判断该采集通道通讯异常。主控单元的主板MCU从内存区中查找出与该通道弧光信号关联的弧光保护，立即闭锁保护功能。During normal operation, the main control unit can detect whether the optical fiber channel of the arc light collection signal is on or off. After detecting that the fiber channel connection is interrupted, it will automatically block the arc protection associated with the arc light signal. The arc light acquisition board of the expansion unit sends an arc light signal every 100us. After the main control unit main board receives the data of the acquisition board and judges it is normal, the communication normal counter is incremented by 1. If it is normal, it is judged that the communication of the acquisition channel is abnormal. The main board MCU of the main control unit finds the arc protection associated with the arc signal of the channel from the memory area, and immediately blocks the protection function.
本发明提供的弧光保护系统检测到弧光信号后能够迅速的出口动作。扩展单元的弧光采集板的采集频率为1KHz，数据发送中断间隔为200us，自弧光发生到扩展单元检测到弧光信号，时间在300us以内；主控单元检测到弧光信号后，采用3取2的方式启动弧光保护，即3次采集的信号中有2次为合，即启动保护出口，主控单元的弧光保护判断中断为417us，启动出口延时为417*3＝1251us以内；本发明采用固态继电器，动作延时只需要2ms；所以，从弧光发生到驱动继电器出口的整个动作时间1251us+300us+2ms<4ms。The arc light protection system provided by the invention can quickly exit after detecting the arc light signal. The acquisition frequency of the arc acquisition board of the expansion unit is 1KHz, and the data transmission interruption interval is 200us. The time from the occurrence of the arc to the detection of the arc signal by the expansion unit is within 300us; after the main control unit detects the arc signal, it adopts the method of 2 out of 3 Start the arc protection, that is, 2 of the 3 collected signals are closed, that is, the protection exit is started, the arc protection judgment interruption of the main control unit is 417us, and the delay of the start exit is within 417*3=1251us; the present invention adopts a solid state relay , the action delay only needs 2ms; therefore, the entire action time from the occurrence of the arc to the drive relay outlet is 1251us+300us+2ms<4ms.
本发明保护系统内部接线，如图3所示。The internal wiring of the protection system of the present invention is shown in FIG. 3 .
实施例2Example 2
本发明的典型保护方案，如图4所示。A typical protection scheme of the present invention is shown in FIG. 4 .
主控单元采集DL1、DL2、DL5、DL6四条线路的电流和变压器低压侧三段母线上所有开关柜的弧光信号。保护配置设置如下：The main control unit collects the current of four lines DL1, DL2, DL5, and DL6 and the arc signals of all switch cabinets on the three-section bus on the low-voltage side of the transformer. The protection configuration settings are as follows:
弧光保护1关联Ⅰ段母线的所有弧光信号、关联DL1和DL5的电流，保护出口矩阵配置成跳DL1和跳DL5两个出口；Arc protection 1 is associated with all arc signals of bus section I and the current associated with DL1 and DL5, and the protection outlet matrix is configured as two outlets jumping DL1 and jumping DL5;
弧光保护2关联Ⅱ段母线的所有弧光信号、关联DL5和DL6的电流，保护出口矩阵配置成跳DL5和跳DL6两个出口；Arc protection 2 is associated with all arc signals of the second section of the bus, associated with the current of DL5 and DL6, and the protection outlet matrix is configured as jumping DL5 and jumping DL6;
弧光保护3关联Ⅲ段母线的所有弧光信号、关联DL2和DL6的电流，保护出口矩阵配置成跳DL2和跳DL6两个出口；Arc protection 3 is associated with all arc signals of the busbar in Section III and the current of DL2 and DL6, and the protection outlet matrix is configured as two outlets jumping DL2 and jumping DL6;
当Ⅰ段母线带Ⅱ段和Ⅲ段母线运行时，DL1、DL5、DL6合。如果Ⅲ段母线发生弧光，则弧光保护3动作，只跳开DL6，保障了Ⅰ段和Ⅱ段母线的正常运行。When section Ⅰ bus runs with section Ⅱ and section Ⅲ buses, DL1, DL5, DL6 close. If an arc light occurs on the bus bar of Section III, the arc protection 3 will act and only DL6 will be tripped, which ensures the normal operation of the bus bars of Section I and Section II.
当Ⅰ段母线带Ⅱ段运行，Ⅲ段独立运行时，DL1、DL5、DL2合。如果Ⅱ段母线发生弧光，则弧光保护2动作，只跳开DL5，保障了Ⅰ段和Ⅲ段母线的正常运行。When section Ⅰ runs with section Ⅱ and section Ⅲ runs independently, DL1, DL5 and DL2 are combined. If the arc light occurs on the busbar of section II, the arc protection 2 will act, and only DL5 will be tripped, which ensures the normal operation of the busbars of section I and section III.
本发明通过上述对保护的关联配置方法实现弧光保护的选择性跳闸功能。The present invention realizes the selective tripping function of arc protection through the above-mentioned associated configuration method for protection.
实施例3Example 3
主控单元还可以不使用弧光主控板，直接插入弧光采集板，通过专用塑料光纤连接弧光采集探头，采集现场弧光信号，经过采集板内部的MCU处理后直接传输给主板，这样直接构成了一套完整的弧光保护系统，中间节省了扩展单元的使用，节约了成本。此种方案在现场弧光点数较少，且相距距离较近的情况下选用。The main control unit can also be directly inserted into the arc light acquisition board without using the arc light main control board, and connected to the arc light acquisition probe through a special plastic optical fiber to collect on-site arc light signals, which are directly transmitted to the main board after being processed by the MCU inside the acquisition board, thus directly forming a A complete arc protection system saves the use of expansion units and saves costs. This scheme is selected when the number of arc points on site is small and the distances are relatively close.
虽然本发明以较佳实施例已公开如上，但实施例和附图并不是用来限定本发明，任何熟习此技艺者，在不脱离本发明之精神和范围内，自当可作各种变化或润饰，但同样在本发明的保护范围之内。因此本发明的保护范围应当以本申请的权利要求保护范围所界定的为准。Although the present invention has been disclosed as above with preferred embodiments, the embodiments and accompanying drawings are not intended to limit the present invention, and any person skilled in the art can make various changes without departing from the spirit and scope of the present invention. Or modification, but also within the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined by the protection scope of the claims of the present application.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606758.XACN104332960B (en) | 2014-10-31 | 2014-10-31 | A kind of intelligent arc light protecting system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606758.XACN104332960B (en) | 2014-10-31 | 2014-10-31 | A kind of intelligent arc light protecting system |
| Publication Number | Publication Date |
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| CN104332960A CN104332960A (en) | 2015-02-04 |
| CN104332960Btrue CN104332960B (en) | 2017-09-22 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410606758.XAActiveCN104332960B (en) | 2014-10-31 | 2014-10-31 | A kind of intelligent arc light protecting system |
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| CN (1) | CN104332960B (en) |
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