CN102495273B - Single current transformer (CT) input dual-precision sampling measuring and protecting integrated device - Google Patents
Single current transformer (CT) input dual-precision sampling measuring and protecting integrated device Download PDFInfo
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Abstract
本发明涉及单CT输入双精度采样测控保护一体化装置，装置的硬件输入为保护CT，保护CT的电流接入装置经过装置内部二次CT变换为电流小信号；然后同时接入2种不同比例的放大回路，将输入小信号电流同时转换为测控用小信号电压和保护用小信号电压(电流)。实现对保护CT电流不同的采样精度，达到同时满足保护逻辑功能需要的大动态范围电流测量需求和电力系统测控功能的电流高精度采样需求，使得保护功能和测控功能可以共用保护CT电流，简化测控保护一体化装置的外部接线，同时简化了设计、安装和调试各个环节，提高系统运行的可靠性。
The invention relates to a single CT input double-precision sampling, measurement, control and protection integrated device. The hardware input of the device is a protection CT, and the current access device of the protection CT is transformed into a small current signal through the secondary CT inside the device; then two different ratios are connected at the same time. The amplifying circuit converts the input small signal current into a small signal voltage for measurement and control and a small signal voltage (current) for protection. Realize different sampling accuracy for the protection CT current, meet the large dynamic range current measurement requirements required by the protection logic function and the current high-precision sampling requirements for the power system measurement and control function, so that the protection function and the measurement and control function can share the protection CT current, simplifying measurement and control It protects the external wiring of the integrated device, simplifies the design, installation and debugging, and improves the reliability of the system operation.
Description
技术领域 technical field
本发明涉及为一种新型保护测控一体装置的的设计，属于电力系统自动化二次设备保护与测控装置技术领域。The invention relates to the design of a novel protection, measurement and control integrated device, and belongs to the technical field of protection and measurement and control devices for secondary equipment in power system automation.
背景技术 Background technique
110kV以下电压等级保护测控一体装置已在电网成功运行10多年，目前传统的一体化保护测控装置，保护与测控功能分别接入相应的保护CT与测量CT，在一个装置中合并原有的保护装置和测控装置功能，一体化装置相对原有的保护装置和测控装置外部接线没有变化。The protection, measurement and control integrated device with voltage level below 110kV has been successfully operated in the power grid for more than 10 years. At present, the traditional integrated protection, measurement and control device, the protection and measurement and control functions are respectively connected to the corresponding protection CT and measurement CT, and the original protection device is combined in one device. Compared with the original protection device and the external wiring of the measurement and control device, the integrated device has no change.
保护CT与测量CT具有不同的测量精度，现有的合并原有的保护装置和测控装置的电压等级保护测控一体装置在器件上冗余，成本高，体积大。Protection CT and measurement CT have different measurement accuracy, and the existing voltage level protection, measurement and control integrated device that combines the original protection device and measurement and control device has redundant components, high cost and large volume.
发明内容 Contents of the invention
本发明的目的是：提出一种对单CT输入双精度采样功能的装置，通过对保护CT(电流互感器)电流进行双精度采样，在精简外部接线的同时满足保护和测控一体化装置的继电保护功能和测量功能对电流采样的要求。The purpose of the present invention is to propose a device with a double-precision sampling function for single CT input. By performing double-precision sampling on the protection CT (current transformer) current, it can meet the requirements of the protection and measurement and control integration device while simplifying the external wiring. The requirements of electrical protection function and measurement function for current sampling.
本发明的目的是通过如下技术方案实现的：单CT输入双精度采样测控保护一体化装置，装置的硬件输入为保护CT(保护用电流互感器)，保护CT的电流接入装置经过装置内部二次CT变换为电流小信号；然后同时接入2种不同比例的放大回路，将输入小信号电流同时转换为测控用小信号电压(电流)和保护用小信号电压(电流)。The purpose of the present invention is achieved through the following technical solutions: a single CT input double-precision sampling, measurement, control and protection integrated device, the hardware input of the device is a protection CT (current transformer for protection), and the current access device of the protection CT passes through two devices inside the device. The secondary CT is transformed into a small current signal; then two kinds of amplification circuits with different ratios are connected at the same time, and the input small signal current is simultaneously converted into a small signal voltage (current) for measurement and control and a small signal voltage (current) for protection.
两组不同量程范围的信号分别接入采样回路；保护功能用电流采样回路设置为宽量程，电流放大比例小；测控功能用电流采样回路设置电流放大比例小，量程小。一次CT二次侧额定电流为In时，保护采样回路测量量程范围0～30In，测控回路电流采样量程范围为0～2In。Two sets of signals with different ranges are respectively connected to the sampling loop; the current sampling loop for the protection function is set to a wide range, and the current amplification ratio is small; the current sampling loop for the measurement and control function is set to a small current amplification ratio and a small range. When the rated current of the primary CT secondary side is In, the measurement range of the protection sampling circuit is 0~30In, and the current sampling range of the measurement and control circuit is 0~2In.
为能够正确测量电力系统故障时的大电流，保护采样回路的量程范围大，在系统正常运行时，电流采样精度较低。二次CT变换为电压(电流)小信号接入不同的采样量程范围的采样保持回路，电流采样精度较高。In order to be able to correctly measure the large current when the power system is faulty, the range of the protection sampling circuit is large, and the current sampling accuracy is low when the system is running normally. The secondary CT is converted into a small voltage (current) signal and connected to a sample-and-hold circuit with different sampling ranges, and the current sampling accuracy is high.
本发明是在分析、对比测量功能利用保护CT和测量CT的精度差异基础上，利用保护CT实现测量功能，这是本发明所需要完成的发明任务，新型的双精度采样测控保护一体化设备对保护CT电流输入设计专门的两路不同精度的二次采样回路，实现对保护CT不同精度的采样，使得保护功能和测控功能同时利用保护CT，简化外部回路接线，简化了设计、安装和调试环节，提高系统可靠性。且在运行管理上可以依托大二次的专业划分，减少维护人员，维护运行更方便。The present invention utilizes the protection CT to realize the measurement function on the basis of analyzing and comparing the precision differences between the protection CT and the measurement CT. This is the inventive task that the present invention needs to complete. Protection CT current input design special two-way secondary sampling circuit with different precision, realize the sampling of protection CT with different precision, make the protection function and measurement and control function use protection CT at the same time, simplify the external circuit wiring, simplify the design, installation and debugging links , improve system reliability. And in the operation management, it can rely on the professional division of the major to reduce maintenance personnel and make maintenance and operation more convenient.
本发明的有益效果还包括：保护和测控一体化装置仅仅需要接入保护CT无须接入测量CT，即可实现继电保护和测量功能需求的两种不同的电流精度和范围要求。实现对CT电流不同的采样精度，达到同时满足保护逻辑功能需要的大动态范围电流测量需求和电力系统测控功能的电流高精度采样需求，使得保护功能和测控功能可以共用保护CT电流，简化测控保护一体化装置的外部接线，同时简化了设计、安装和调试各个环节，提高系统运行的可靠性。The beneficial effect of the present invention also includes: the integrated protection and measurement and control device only needs to be connected to the protection CT without connecting to the measurement CT, and can realize two different current accuracy and range requirements of the relay protection and measurement function requirements. Realize different sampling accuracy of CT current, meet the large dynamic range current measurement requirements required by the protection logic function and high-precision current sampling requirements of the power system measurement and control function, so that the protection function and the measurement and control function can share the protection CT current, simplifying measurement and control protection The external wiring of the integrated device simplifies all aspects of design, installation and commissioning, and improves the reliability of the system operation.
附图说明 Description of drawings
图1是本发明的双精度采样测控保护一体化装置结构框图。Fig. 1 is a structural block diagram of an integrated device for double-precision sampling, measurement, control and protection of the present invention.
具体实施方式 Detailed ways
以下通过附图对本发明做进一步说明：The present invention will be further described below by accompanying drawing:
本发明具体实施步骤如下：The concrete implementation steps of the present invention are as follows:
1、首先保护CT的次级接入装置内CT，转换为小信号电流。1. First protect the CT in the secondary access device of the CT, and convert it into a small signal current.
2、小信号电流接入2种不同比例的放大回路，将输入小信号电流同时转换为测控用小信号电压(电流)和保护用小信号电压(电流)两组不同量程范围的小信号电压(电流)。保护用小信号电流放大比例小，为宽量程；测控用小信号电流电流放大比例大，量程范围小。一次CT二次侧额定电流为In时，保护采样回路测量量程范围0～30In，测控回路电流采样量程范围为0～2In。2. The small signal current is connected to two kinds of amplification circuits with different ratios, and the input small signal current is simultaneously converted into small signal voltage (current) for measurement and control and small signal voltage (current) for protection. Two groups of small signal voltages with different ranges ( current). The small signal current amplification ratio for protection is small, which is a wide range; the small signal current current amplification ratio for measurement and control is large, and the measurement range is small. When the rated current of the primary CT secondary side is In, the measurement range of the protection sampling circuit is 0~30In, and the current sampling range of the measurement and control circuit is 0~2In.
3、对两组不同量程的转换后信号电流进行AD采集，分别对采集后的数据进行计算，保护采样数据用于继电保护逻辑控制，测量采样数据用于测控系统使用。3. Carry out AD acquisition for two groups of converted signal currents with different ranges, and calculate the collected data respectively. The protection sampling data is used for relay protection logic control, and the measurement sampling data is used for the measurement and control system.
参见图1：本发明方法的硬件设计框图。Referring to Fig. 1: the hardware design block diagram of the inventive method.
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| CN103558465A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Method for on-line precision calibration of 10kV protecting device |
| CN104764920B (en) * | 2014-01-03 | 2018-05-29 | 国家电网公司 | MMC flexible direct-current transmission of electricity dynamic model experiment platform simulation quantity collection system and implementation method |
| CN107942118A (en) * | 2017-11-13 | 2018-04-20 | 国家电网公司 | A kind of multrirange collecting unit, Medium Voltage Switchgear signal pickup assembly and system |
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| CN201270407Y (en) * | 2008-09-12 | 2009-07-08 | 南京因泰莱电器股份有限公司 | Measurement and control apparatus for microcomputer synthetic protection |
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Effective date of registration: 20220622 Address after: No.17 Binhe Road, Nanming District, Guiyang City, Guizhou Province Patentee after: Guizhou Power Grid Co.,Ltd. Address before: 550002 Jiefang Road 251, Guiyang, Guizhou Patentee before: Guizhou Electric Power Test Research Institute Patentee before: Jiangsu Jinzhi Technology Co., Ltd |