CN203259608U - Electric energy on-line monitoring and fault diagnosing system based on digital distributed architecture - Google Patents
Electric energy on-line monitoring and fault diagnosing system based on digital distributed architecture Download PDFInfo
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Abstract
Description
技术领域technical field
本实用新型属于一种电力技术和设备，适用于35～110kV变电站，能够对10kV母线和线路进行实时电能质量监测，在发生故障导致电能质量异常时，系统将电能质量分析和故障诊断进行有机的结合，深入分析诊断电能质量异常的产生原因，为进一步改善电能质量提供决策依据。The utility model belongs to a kind of electric power technology and equipment, which is suitable for 35-110kV substations, and can monitor the real-time power quality of 10kV busbars and lines. Combined with in-depth analysis and diagnosis of the causes of abnormal power quality, it provides a decision-making basis for further improving power quality.
背景技术Background technique
电能质量的指标若偏离正常水平过大，会导致电气设备寿命缩短、网损加大、系统发生谐波谐振的可能性增加、并联电容器不能正常运行，同时可能引发继电保护和自动装置的非故障性动作，导致仪表指示和电能计量不准以及计算机、通信受干扰等一系列问题。特别是随着计算机、电力电子和信息技术等高新产业的发展和普及，对电能质量提出了越来越高的要求。If the power quality index deviates too much from the normal level, it will shorten the life of electrical equipment, increase the network loss, increase the possibility of harmonic resonance in the system, and cause the parallel capacitor to fail to operate normally. At the same time, it may cause abnormalities in relay protection and automatic devices. Faulty actions lead to a series of problems such as inaccurate instrument indication and electric energy measurement, as well as computer and communication interference. Especially with the development and popularization of high-tech industries such as computers, power electronics and information technology, higher and higher requirements are placed on power quality.
要对电网的电能质量进行改善，首先要对电能质量做出精确的检测和分析，测量电网的电能质量水平，并分析和判断造成各种电能质量问题的原因，为电能质量的改善提供依据。对于大型干扰源如炼钢厂、电气化铁路等必须按照电能质量标准，对电压偏差、频率偏差、谐波、电压波动和闪变、三相不平衡等指标进行连续跟踪监测。随着社会经济的发展和电力行业的发展，供电公司要保证供电的安全性、可靠性和经济性，提高自身的竞争力，其中一个最重要的措施就是实时在线监测电能质量并迅速决策诊断。To improve the power quality of the power grid, it is first necessary to accurately detect and analyze the power quality, measure the power quality level of the power grid, analyze and judge the causes of various power quality problems, and provide a basis for the improvement of power quality. For large-scale interference sources such as steel mills and electrified railways, continuous tracking and monitoring of indicators such as voltage deviation, frequency deviation, harmonics, voltage fluctuations and flicker, and three-phase unbalance must be carried out in accordance with power quality standards. With the development of social economy and the power industry, power supply companies must ensure the safety, reliability and economy of power supply and improve their competitiveness. One of the most important measures is to monitor power quality online in real time and make rapid decision-making diagnoses.
目前的电能质量监测装置都采用微机型装置，需要将待分析母线电压或线路电流的二次电缆接入装置。这种传统的采样分析的缺点是需要敷设大量的二次电缆，不仅接线复杂，而且由于二次电缆之间的耦合，有可能导致二次电流、电压数据失真，测量值也就失去了意义。另外目前电能质量监测装置仅仅能够分析若干个间隔的电能质量数据，但是不能有机的将电能质量和故障诊断结合到一起，当运行人员发现电能质量不合格时，往往需要依靠经验判断原因，电能质量监测装置的决策支持能力不足。The current power quality monitoring devices all use microcomputer devices, and the secondary cables to be analyzed for the bus voltage or line current need to be connected to the device. The disadvantage of this traditional sampling analysis is that a large number of secondary cables need to be laid, not only the wiring is complicated, but also due to the coupling between the secondary cables, the secondary current and voltage data may be distorted, and the measured value will lose its meaning. In addition, current power quality monitoring devices can only analyze power quality data at several intervals, but cannot organically combine power quality and fault diagnosis. When operators find that power quality is unqualified, they often need to rely on experience to judge the cause. The decision support capability of the monitoring device is insufficient.
发明内容Contents of the invention
本实用新型的目的是克服现有技术上的不足，提出数字化分布式电能质量在线监测及故障诊断系统。本实用新型适用于35～110kV变电站，能够对10kV母线和线路进行实时电能质量监测，在发生故障导致电能质量异常时，系统将电能质量分析和故障诊断进行有机的结合，深入分析诊断电能质量异常的产生原因，为进一步改善电能质量提供决策依据。The purpose of the utility model is to overcome the deficiencies in the prior art and propose a digital distributed power quality online monitoring and fault diagnosis system. The utility model is suitable for 35-110kV substations, and can monitor the real-time power quality of 10kV busbars and lines. When a fault occurs and the power quality is abnormal, the system organically combines power quality analysis and fault diagnosis to deeply analyze and diagnose power quality abnormalities. The reason for the occurrence of the problem provides a decision-making basis for further improving the power quality.
本实用新型的技术方案如下：The technical scheme of the utility model is as follows:
一种基于数字化分布式结构的电能质量在线监测及故障诊断系统，该系统由监测系统服务器A、以太网光交换机B和测量单元C1……Cn三个部分组成，其特征为：An online power quality monitoring and fault diagnosis system based on a digital distributed structure. The system consists of three parts: a monitoring system server A, an Ethernet optical switch B, and measurement units C1...Cn. Its features are:
每个间隔的电流互感器和电压互感器的副边通过二次电缆连接至相应间隔的测量单元中的模拟量变换器板卡，所述测量单元中的嵌入式主板通过光纤以太网口连接至以太网光交换机B的输入端；所述以太网光交换机B的输出端连接至系统服务器A的输入端；The secondary side of the current transformer and voltage transformer in each interval is connected to the analog converter board in the measurement unit of the corresponding interval through a secondary cable, and the embedded main board in the measurement unit is connected to the The input end of Ethernet optical switch B; the output end of described Ethernet optical switch B is connected to the input end of system server A;
其中，所述测量单元安装于10kVPT柜和出线柜内，所述监测系统服务器A和以太网光交换机B安装在变电站主控室。Wherein, the measurement unit is installed in the 10kVPT cabinet and the outlet cabinet, and the monitoring system server A and the Ethernet optical switch B are installed in the main control room of the substation.
本实用新型还进一步包括以下优选方案：The utility model further includes the following preferred solutions:
所述以太网光交换机的速度为2560Mbps，支持单模光纤和多模光纤。The Ethernet optical switch has a speed of 2560Mbps and supports single-mode optical fiber and multi-mode optical fiber.
所述测量单元中的模拟量变换器板卡上设置有电压变换器和电流变换器，所述模拟量变换器板卡通过背板的连线连接到测量单元中嵌入式主板。所述测量单元中嵌入式主板集成有CPU、FLASH、AD、RAM。The analog converter board in the measurement unit is provided with a voltage converter and a current converter, and the analog converter board is connected to the embedded main board in the measurement unit through a connection on the backplane. The embedded motherboard in the measuring unit is integrated with CPU, FLASH, AD and RAM.
所述监测系统服务器还能够通过局域网连接至电脑终端。The monitoring system server can also be connected to a computer terminal through a local area network.
本实用新型的优点如下：The utility model has the following advantages:
1、测量单元对10kV母线电压和线路电流信号进行就地数字化，通过以太网传输到智能系统服务器，充分保证数据传输过程中实时性和准确性。1. The measurement unit digitizes the 10kV bus voltage and line current signals in situ, and transmits them to the intelligent system server through Ethernet, fully ensuring real-time and accuracy during data transmission.
2、测量单元设计具有很高的测量精度和速度，采样率达到256点/周波，可实现对高次谐波的分析需求。2. The measurement unit design has high measurement accuracy and speed, and the sampling rate reaches 256 points/cycle, which can meet the analysis requirements for high-order harmonics.
3、技术成熟、可靠性高，在发生故障导致电能质量异常时，将电能质量分析和故障诊断进行有机的结合，深入分析诊断电能质量异常的产生原因，为进一步改善电能质量提供决策依据。3. Mature technology and high reliability. When a fault causes abnormal power quality, organically combine power quality analysis and fault diagnosis, deeply analyze and diagnose the cause of abnormal power quality, and provide decision-making basis for further improving power quality.
附图说明Description of drawings
图1是本实用新型的结构示意图；Fig. 1 is the structural representation of the utility model;
图2是本实用新型的测量单元原理图；Fig. 2 is a schematic diagram of the measuring unit of the present utility model;
图3是本实用测量单元的光纤以太网功能原理图。Fig. 3 is a schematic diagram of the optical fiber Ethernet function of the practical measuring unit.
具体实施方式Detailed ways
下面结合说明书如图，通过具体实施例对本实用新型的技术方案作进一步详细说明。The technical scheme of the utility model will be further described in detail through specific embodiments below in conjunction with the description as shown in the figure.
本实用新型提出的数字化分布式电能质量在线监测及故障诊断系统，其原理是监测系统测量单元对10kV母线电压和线路电流进行采样，通过光纤以太网经光交换机传输到监测系统服务器，服务器汇总多个间隔的电气量信号，进行电能质量分析以及故障诊断。The principle of the digital distributed power quality on-line monitoring and fault diagnosis system proposed by the utility model is that the monitoring system measurement unit samples the 10kV bus voltage and line current, and transmits them to the monitoring system server through the optical fiber Ethernet through the optical switch, and the server summarizes more Electrical quantity signals at intervals for power quality analysis and fault diagnosis.
数字化分布式电能质量在线监测及故障诊断系统由监测系统服务器、以太网光交换机和测量单元三个部分组成。所述监测系统服务器安装在变电站主控室，接收所述测量单元传输来的电压、电流信号，进行电能质量监测和故障诊断；所述以太网光交换机也安装在变电站主控室，接收并汇总各个测量单元传输来的电压、电流信号并上传给监测系统服务器；所述测量单元安装于10kVPT柜和出线柜内，对电压、电流进行采样，并就地数字化。所述监测系统服务器将测量单元传来的10kV母线电压和线路电流信号汇总，综合分析故障类型。所述以太网光交换机的速度为2560Mbps，支持单模光纤和多模光纤，很好地满足了数据传输实时性的要求。电压、电流信号接入测量单元的A/D模块，转换为数字信号后将瞬时值通过光纤以太网上传，保证了数据的完整性。所述监测系统服务器具有Web发布功能，在网络中的电脑可以通过浏览器查看变电站的电能质量和故障信息。The digital distributed power quality online monitoring and fault diagnosis system consists of three parts: monitoring system server, Ethernet optical switch and measuring unit. The monitoring system server is installed in the main control room of the substation, receives the voltage and current signals transmitted by the measurement unit, and performs power quality monitoring and fault diagnosis; the Ethernet optical switch is also installed in the main control room of the substation, receives and summarizes The voltage and current signals transmitted by each measurement unit are uploaded to the monitoring system server; the measurement units are installed in the 10kVPT cabinet and the outlet cabinet, and the voltage and current are sampled and digitized on site. The monitoring system server summarizes the 10kV bus voltage and line current signals from the measuring unit, and comprehensively analyzes the fault type. The Ethernet optical switch has a speed of 2560 Mbps, supports single-mode optical fiber and multi-mode optical fiber, and satisfies the real-time requirement of data transmission well. The voltage and current signals are connected to the A/D module of the measurement unit, converted into digital signals, and the instantaneous values are uploaded through optical fiber Ethernet to ensure the integrity of the data. The monitoring system server has a Web publishing function, and computers in the network can check the power quality and fault information of the substation through a browser.
10kV母线电压和线路电流信号接入测量单元，即将互感器二次模拟信号就地进行数字化，将数字信号通过光纤以太网经光交换机传输到监测系统服务器。服务器汇总多个间隔的电气量信号，在系统正常运行时，监视各个间隔的运行状况，分析各项电能质量指标。对电压、电流数据的间歇性变化、波动进行捕捉录波并提供信息，另外实现绝缘监测功能并反映中性点偏移和对地电压数值。在发生故障导致电能质量异常时，监测系统服务器立即启动录波，并将电能质量分析和故障诊断进行有机的结合，深入分析诊断电能质量异常的产生原因，为进一步改善电能质量提供决策依据。The 10kV bus voltage and line current signals are connected to the measurement unit, that is, the secondary analog signal of the transformer is digitized on the spot, and the digital signal is transmitted to the monitoring system server through the optical fiber Ethernet through the optical switch. The server summarizes the electrical quantity signals of multiple intervals, and monitors the operation status of each interval when the system is running normally, and analyzes various power quality indicators. Capture and record the intermittent changes and fluctuations of voltage and current data and provide information, and also realize the insulation monitoring function and reflect the neutral point offset and ground voltage values. When a fault occurs that causes abnormal power quality, the server of the monitoring system immediately starts wave recording, and organically combines power quality analysis and fault diagnosis to deeply analyze and diagnose the cause of abnormal power quality and provide decision-making basis for further improving power quality.
本实用新型的结构示意图如图1所示，A代表监测系统服务器，C1-Cn代表测量单元，B代表光交换机。测量单元采样率达到256点/周波，对10kV母线电压和线路电流进行采样，并将二次模拟信号就地进行数字化，将数字信号通过光纤以太网经光交换机传输到监测系统服务器。服务器汇总多个间隔的电气量信号，在系统正常运行时，监视各个间隔的运行状况，分析各项电能质量指标。对电压、电流数据的间歇性变化、波动进行捕捉录波并提供信息，另外实现绝缘监测功能并反映中性点偏移和对地电压数值。在发生故障导致电能质量异常时，监测系统服务器立即启动录波，并将电能质量分析和故障诊断进行有机的结合，深入分析诊断电能质量异常的产生原因，为进一步改善电能质量提供决策依据。监测系统服务器具有Web发布功能，在网络中的电脑可以通过浏览器查看变电站的电能质量和故障信息。The structural diagram of the utility model is shown in Figure 1, A represents the monitoring system server, C1-Cn represents the measurement unit, and B represents the optical switch. The sampling rate of the measurement unit reaches 256 points/cycle, samples the 10kV bus voltage and line current, digitizes the secondary analog signal on site, and transmits the digital signal to the monitoring system server through the optical fiber Ethernet through the optical switch. The server summarizes the electrical quantity signals of multiple intervals, and monitors the operation status of each interval when the system is running normally, and analyzes various power quality indicators. Capture and record the intermittent changes and fluctuations of voltage and current data and provide information, and also realize the insulation monitoring function and reflect the neutral point offset and ground voltage values. When a fault occurs that causes abnormal power quality, the monitoring system server immediately starts wave recording, and organically combines power quality analysis and fault diagnosis to deeply analyze and diagnose the cause of abnormal power quality and provide decision-making basis for further improving power quality. The monitoring system server has a Web publishing function, and computers in the network can view the power quality and fault information of the substation through a browser.
测量单元的原理图如图2所示，通过二次电缆将各个间隔电流互感器和电压互感器的副边模拟信号接入测量单元装置的模拟量变换器板卡D1，板卡上的电压变换器A1和电流变换器A2将电压和电流转变为-5V与+5V之间的低压模拟量信号，该信号通过背板B的连线接到嵌入式主板D2上。嵌入式主板D2包括CPU、FLASH、AD、RAM，其中的CPU对数字信号进行预处理，删除掉错误数据，然后将瞬时采样值通过光纤以太网口Ethern实时地上传给监测系统服务器C。The schematic diagram of the measurement unit is shown in Figure 2. The secondary side analog signals of the current transformers and voltage transformers of each interval are connected to the analog converter board D1 of the measurement unit device through the secondary cable, and the voltage conversion on the board is Converter A1 and current converter A2 transform the voltage and current into a low-voltage analog signal between -5V and +5V, and the signal is connected to the embedded motherboard D2 through the connection on the backplane B. The embedded motherboard D2 includes CPU, FLASH, AD, and RAM. The CPU preprocesses the digital signal, deletes the wrong data, and then uploads the instantaneous sampling value to the monitoring system server C in real time through the optical fiber Ethernet port Ether.
测量单元的光纤以太网通信功能的实现原理如图3所示，光纤以太网由以太网控制芯片CS8900A、10BASE-FX转换芯片IP113A、光纤收发芯片AFBR5803构成，CS8900A通过数据总线、地址总线、控制总线连接到CPU。IP113A是把10BASE-T信号转换成光纤信号，该信号通过AFBR5803光纤收发模块实现收发，AFBR5803的发射与接收接入光纤网络。The realization principle of the optical fiber Ethernet communication function of the measurement unit is shown in Figure 3. The optical fiber Ethernet is composed of the Ethernet control chip CS8900A, the 10BASE-FX conversion chip IP113A, and the optical fiber transceiver chip AFBR5803. The CS8900A passes the data bus, address bus, and control bus connected to the CPU. IP113A converts 10BASE-T signal into optical fiber signal, and the signal is sent and received through AFBR5803 optical fiber transceiver module, and the transmission and reception of AFBR5803 are connected to the optical fiber network.
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| CN103941160A (en) * | 2014-05-06 | 2014-07-23 | 北京丹华昊博电力科技有限公司 | Power distribution network loop closing detection device and method |
| CN104297681A (en) * | 2014-11-03 | 2015-01-21 | 国家电网公司 | High-voltage circuit breaker state online monitoring and evaluating system |
| CN107144761A (en) * | 2017-04-17 | 2017-09-08 | 浙江瑞银电子有限公司 | A kind of wiring faults detecting system and method based on sampling module |
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| CN103941160A (en) * | 2014-05-06 | 2014-07-23 | 北京丹华昊博电力科技有限公司 | Power distribution network loop closing detection device and method |
| CN103941160B (en) * | 2014-05-06 | 2017-01-25 | 华北电力大学（保定） | Power distribution network loop closing detection device and method |
| CN104297681A (en) * | 2014-11-03 | 2015-01-21 | 国家电网公司 | High-voltage circuit breaker state online monitoring and evaluating system |
| CN107144761A (en) * | 2017-04-17 | 2017-09-08 | 浙江瑞银电子有限公司 | A kind of wiring faults detecting system and method based on sampling module |
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