技术领域technical field
本发明涉及直流电力设备监测设备领域，具体地，涉及一种交流窜入直流监测仪。The invention relates to the field of DC power equipment monitoring equipment, in particular to an AC intrusion DC monitor.
背景技术Background technique
直流电源系统在换流站、变电站中有着重要的作用，它能提供可靠地、不间断的为站内的重要设备提供装置电源及控制电源，例如继电保护装置、通信设备、自动监控系统、断路器、刀闸控制电源直流照明等。直流系统是保障电力系统安全稳定运行的关键。DC power system plays an important role in converter stations and substations. It can provide reliable and uninterrupted device power and control power for important equipment in the station, such as relay protection devices, communication equipment, automatic monitoring systems, circuit breakers, etc. switch, switch control power supply, DC lighting, etc. The DC system is the key to ensure the safe and stable operation of the power system.
直流系统中交流窜入交流危害最大，引起直流系统金属性接地，绝缘监测装置工作异常；引起厂站系统监控装置误发大量告警信息，而且频繁刷新；引起继电保护装置保护出口中间继电器误动、尤其是变压器非电量保护误动或引发直流熔丝熔断造成全站保护拒动事故，严重的可导致机组停运、线路跳闸，甚至可导致全厂或全站停电事故，对社会造成大面积停电事故。引发交流窜入直流故障得原因众多。绝缘电缆的损坏，交流供电回路的电缆与直流电源的供电回路电缆放在一起，使得交流电缆和直流电缆的内芯发生直接或者间接电气接触，从而导致交流电源窜入直流电源系统。人为的操作失误，错误地将交流电接到直流系统供电回路中去，从而导致发生交流电源窜入直流电源系统事故。设备内部故障，由于设备内部电源部分隔离故障或者其它故障，如室外端子箱由于下雨受潮或者进水，导致交流电源窜扰到直流系统中。In the DC system, the AC intrusion into the AC is the most harmful, causing the metal grounding of the DC system, and the insulation monitoring device works abnormally; causing the monitoring device of the plant station system to send a large number of alarm information by mistake, and frequently refreshing; causing the relay protection device to protect the export intermediate relay. , especially the misoperation of the non-electricity protection of the transformer or the fusing of the DC fuse, resulting in the failure of the protection of the whole station, which can lead to the outage of the unit, the tripping of the line, and even the power failure of the whole plant or the whole station, causing large-scale damage to the society. Power outage accident. There are many reasons for AC to DC faults. The damage of the insulated cable, the cable of the AC power supply circuit and the power supply circuit cable of the DC power supply are put together, so that the inner cores of the AC cable and the DC cable have direct or indirect electrical contact, which causes the AC power supply to enter the DC power supply system. Man-made operation errors, mistakenly connect the AC power to the DC system power supply circuit, resulting in accidents where the AC power enters the DC power system. The internal fault of the equipment is due to the isolation fault of the internal power supply of the equipment or other faults, such as the outdoor terminal box being damp or flooded due to rain, causing the AC power to interfere with the DC system.
2012年3月国家电网公司修定《国家电网公司十八项重大反事故措施》中第5.1.18项“防止变电站交流电源窜入直流电源事故”中明确提出直流电源系统要增加具有交流窜入直流电源的报警和测记装置，并且定期检查其可靠性和有效性。In March 2012, the State Grid Corporation of China revised the "Eighteen Major Anti-Accident Measures of the State Grid Corporation of China", item 5.1.18 "Preventing AC Power Supply Accidents from Transforming Substations into DC Power Supply Accidents". The alarm and marking device of the DC power supply, and its reliability and validity shall be checked regularly.
图1是交流窜入直流系统示意图，根据窜入点不同分为：交流窜入A、B点时导致的正、负母线直流接地的直接窜入以及交流窜入C点时导致的正、负母线电阻接地的经过过渡电阻窜入。现有设备能直接监测出交流窜入A、B点时的正、负母线的直流接地，但当交流窜入C点时的正、负母线电阻接地，由于负荷等效电阻R1、R2和窜入交流幅值的不同，现有监测设备可能不会报警，从而引发交流窜入直流故障危害。同时传统的直流传入交流监测设备存在故障报警不及时，故障报警不准确的情况，同时不能查看交流电压、直流电压波形记录以及纹波系数对于故障判断的不能提供足够的依据。Figure 1 is a schematic diagram of the AC intrusion into the DC system. According to the different intrusion points, it can be divided into: the direct intrusion of the positive and negative bus DC grounding caused by the AC intrusion into points A and B, and the positive and negative intrusion caused by the AC intrusion into point C. The grounding of the bus resistance passes through the transition resistance. The existing equipment can directly monitor the DC grounding of the positive and negative bus bars when the AC breaks into points A and B, but the positive and negative bus resistances are grounded when the AC breaks into point C. Due to the load equivalent resistance R1, R2 and the Due to the difference in the input AC amplitude, the existing monitoring equipment may not give an alarm, which will cause the damage of AC to DC faults. At the same time, the traditional DC-to-AC monitoring equipment has fault alarms that are not timely and inaccurate. At the same time, the AC voltage, DC voltage waveform records, and ripple coefficient cannot provide sufficient basis for fault judgment.
综上所述，本申请发明人在实现本申请发明技术方案的过程中，发现上述技术至少存在如下技术问题：To sum up, in the process of realizing the technical solution of the invention of the present application, the inventor of the present application found that the above-mentioned technology has at least the following technical problems:
在现有技术中，现有的交流窜入直流监测系统存在监测不准确，报警不及时、不准确的技术问题。In the prior art, the existing AC intrusion into DC monitoring system has the technical problems of inaccurate monitoring, untimely and inaccurate alarm.
发明内容Contents of the invention
本发明提供了一种交流窜入直流监测仪，解决了现有的交流窜入直流监测系统存在监测不准确，实现了通过本申请中的交流窜入直流监测仪能够准确的对交流窜入直流进行监测的技术效果。The invention provides an AC intrusion into DC monitor, which solves the inaccurate monitoring of the existing AC intrusion into DC monitoring system, and realizes that the AC intrusion into DC monitor in this application can accurately monitor the AC intrusion into DC The technical effect of monitoring.
在现有技术中，由于负荷等效电阻R1、R2和窜入交流幅值的不同，现有监测设备可能不会报警，从而引发交流窜入直流故障危害。主要通过正负母线对地电压波形图的区别确认交流窜入故障。In the prior art, due to the difference between the load equivalent resistances R1 and R2 and the amplitude of the intrusion AC, the existing monitoring equipment may not alarm, thus causing the harm of the AC intrusion into the DC fault. The AC break-in fault is mainly confirmed by the difference between the positive and negative bus-to-ground voltage waveforms.
直流窜入交流故障危害大，发生几率高，因此直流系统增加“交流窜入直流监测设备”是迫在眉睫的事情。为实现上述发明目的，本申请提供了一种交流窜入直流监测仪，采用信号隔离、高速采样、交直流状态分析等，实现交流窜入检测报警、直流电压监测和纹波测量等功能，实时显示当前测量值，当发生异常状况时声光报警，并提供干接点输出端口和RS485通讯端口，可将监测信息实时上传至上位机。DC intrusion into AC faults are very harmful and have a high probability of occurrence. Therefore, it is imminent to add "AC intrusion into DC monitoring equipment" in the DC system. In order to achieve the purpose of the above invention, this application provides an AC intrusion DC monitor, which adopts signal isolation, high-speed sampling, AC and DC state analysis, etc., to realize functions such as AC intrusion detection and alarm, DC voltage monitoring and ripple measurement, real-time Display the current measurement value, sound and light alarm when abnormal conditions occur, and provide dry contact output port and RS485 communication port, which can upload the monitoring information to the host computer in real time.
为实现上述目的，本发明采用如下技术方案：To achieve the above object, the present invention adopts the following technical solutions:
一种交流窜入直流监测仪，该设备包括：数据采集单元、光电隔离单元、CPU、报警输出单元、声光报警单元、电源模块、时钟单元、存储器、复位单元、显示器、通讯单元。An AC intrusion into DC monitor, the device includes: a data acquisition unit, a photoelectric isolation unit, a CPU, an alarm output unit, an audible and visual alarm unit, a power supply module, a clock unit, a memory, a reset unit, a display, and a communication unit.
所述数据采集单元能够采集直流母线上的交流信号、直流信号以及纹波信号，包括数据采集电路以及A/D转换电路。所述直流采集以及交流采集利用电容的“隔直通交”特性进行采集。所述纹波信号采集利用电容的“隔直通交”特性进行分离、提取。所述数据采集单元测量参数为：窜入交流电压测量精度±2％；交流窜入直流监测反应时间<1S；直流电压测量范围0～300V，分辨率0.1V；直流电压测量精度±1％；直流电源纹波系数0～99.99％。所述调理电路为差分放大电路，具有高输入阻抗、低噪声、低漂移、高共模抑制比的特点。所述数据采集电路通过放大器实现电源隔离。所述A/D转换电路为模数转换器，将模拟信号转换为数字信号。所述A/D转换电路考虑模数转换器参考电源的温度稳定性不佳的因素，利用电压基准芯片作为外部基准电压源施加于模数转换器基准电压引脚作为参考电源使用。The data acquisition unit is capable of acquiring AC signals, DC signals and ripple signals on the DC bus, and includes a data acquisition circuit and an A/D conversion circuit. The DC collection and the AC collection utilize the "direct-blocking and passing-through" characteristic of capacitors for collection. The ripple signal is collected and separated and extracted by using the "direct-blocking and traffic-blocking" characteristic of the capacitor. The measurement parameters of the data acquisition unit are: AC voltage measurement accuracy ±2%; AC input DC monitoring response time <1S; DC voltage measurement range 0-300V, resolution 0.1V; DC voltage measurement accuracy ±1%; DC power supply ripple coefficient 0~99.99%. The conditioning circuit is a differential amplifier circuit, which has the characteristics of high input impedance, low noise, low drift, and high common-mode rejection ratio. The data acquisition circuit implements power isolation through an amplifier. The A/D conversion circuit is an analog-to-digital converter, which converts analog signals into digital signals. The A/D conversion circuit considers the poor temperature stability of the reference power supply of the analog-to-digital converter, and uses a voltage reference chip as an external reference voltage source to apply to the reference voltage pin of the analog-to-digital converter as a reference power supply.
所述光电隔离单元将高压与低压分开，提高系统和装置的安全性和稳定性。The photoelectric isolation unit separates the high voltage from the low voltage, improving the safety and stability of the system and device.
所述CPU将数据采集单元得来的信号经过高速运算处理，分析计算交流窜入直流电压数值，并对比设定交流窜入报警阀值判断故障情况后在界面上显示出来，如果发生故障会进行报警。The CPU processes the signal obtained by the data acquisition unit through high-speed computing, analyzes and calculates the AC intrusion DC voltage value, and compares the set AC intrusion alarm threshold to judge the fault situation and then displays it on the interface. If a fault occurs, it will Call the police.
所述报警输出单元路实现交流窜入、系统故障的报警功能，提供交流窜入故障以及系统故障的常开无缘干接点。所述干接点继电器触点容量为AC250V/3A。The alarm output unit circuit realizes the alarm function of AC intrusion and system failure, and provides a normally open non-connected dry contact for AC intrusion failure and system failure. The contact capacity of the dry contact relay is AC250V/3A.
所述声光报警单元实现交流窜入、系统故障的声光报警功能。The sound and light alarm unit realizes the sound and light alarm function of AC intrusion and system failure.
所述电源模块为整个装置提供最基础的电能，能够提供5V、9V、12V、15V的输出。The power supply module provides the most basic electric energy for the whole device, and can provide outputs of 5V, 9V, 12V, and 15V.
所述时钟单元实时记录报警时间，并且不受设备掉电影响，同时可手动校准系统时钟。所述CPU能通过时钟单元通讯，进行时钟校准。The clock unit records the alarm time in real time, and is not affected by power failure of the device, and the system clock can be manually calibrated at the same time. The CPU can communicate through the clock unit to perform clock calibration.
所述存储器实时存储报警信息，支持掉电保存。所述CPU能将数据传输给存储器进行保存，同时能提取存储器中的数据进行查看。所述存储器数据存储容量为1000条。The memory stores alarm information in real time and supports power-off storage. The CPU can transmit data to the memory for storage, and at the same time can extract the data in the memory for viewing. The data storage capacity of the memory is 1000 pieces.
所述复位单元具有上电复位、低电压复位控制以及看门狗定时器功能。The reset unit has functions of power-on reset, low voltage reset control and watchdog timer.
所述显示器采用4.3寸全彩触摸液晶显示屏，实时显示当前正、负母线对地电压波形图、电压测量值、报警值，且可查看历史记录；全中文菜单式操作，简单易用。The display adopts a 4.3-inch full-color touch LCD display, which displays the current positive and negative bus-to-ground voltage waveforms, voltage measurement values, and alarm values in real time, and can view historical records; all Chinese menu operations are easy to use.
所述通讯单元为1路RS485通讯端口，供其他监控设备采集和系统集成。所述CPU能通过通讯接口与主机及其他监控设备联机通讯。The communication unit is one RS485 communication port for collection and system integration of other monitoring equipment. The CPU can communicate online with the host computer and other monitoring equipment through the communication interface.
所述交流窜入直流监测仪具有实时监测、历史记录、报警设置、时钟校准、通讯参数、系统说明等软件模块。The AC intrusion into DC monitor has software modules such as real-time monitoring, historical records, alarm settings, clock calibration, communication parameters, and system descriptions.
所述交流窜入直流监测仪无需改动原有直流系统绝缘监测装置，直接加装于直流屏即可，且体积小，并提供“面板嵌入式安装”、“背挂卡扣式安装”、“背面螺丝固定安装”三种安装方式，安装、接线非常方便。The AC intrusion DC monitor does not need to change the original DC system insulation monitoring device, it can be directly installed on the DC screen, and the volume is small, and it provides "panel embedded installation", "back-mounted buckle installation", " Back screw fixed installation "three installation methods, installation and wiring are very convenient.
本申请提供的一个或多个技术方案，至少具有如下技术效果或优点：One or more technical solutions provided by this application have at least the following technical effects or advantages:
1.可靠性：电路、程序优化设计，元器件选材考究，采用工业级嵌入式处理器和高精度、高速度A/D转换芯片，测量精度高、抗干扰能力强，数据采集快速、准确，无漏报、误报现象。1. Reliability: Optimized design of circuits and programs, sophisticated material selection of components, industrial-grade embedded processors and high-precision, high-speed A/D conversion chips, high measurement accuracy, strong anti-interference ability, fast and accurate data collection, No omissions or false positives.
2.安全性：采用光电隔离、电源隔离、通讯端口隔离及模拟、数字隔离技术，并充分考虑直流正负母线与地之间的绝缘，确保设备的安全性、可靠性和检测的准确性，且不影响直流系统的安全运行。2. Safety: Adopt photoelectric isolation, power isolation, communication port isolation and analog and digital isolation technologies, and fully consider the insulation between the DC positive and negative busbars and the ground to ensure the safety, reliability and detection accuracy of the equipment. And it will not affect the safe operation of the DC system.
3.安装便捷：设备无需改动原有直流系统绝缘监测装置，直接加装于直流屏即可，且体积小，可以面板嵌入式安装、背挂卡扣式安装、背面螺丝固定安装，安装、接线非常方便。3. Convenient installation: The equipment does not need to change the original DC system insulation monitoring device, it can be directly installed on the DC screen, and the volume is small, and it can be installed in the panel, mounted on the back with buckle, fixed with screws on the back, installed and wired Very convenient.
4.功能性：不仅能通过交流窜入直流监测交流窜入直流故障，并进行实时报警，同时能自动记录故障波形、直流电源的纹波系数，通过波形可以分析“正母窜入”、“负母窜入”还是“正负母之间窜入”。4. Functionality: It can not only monitor the AC intrusion into the DC fault through the AC intrusion into the DC, and give a real-time alarm, but also automatically record the fault waveform and the ripple coefficient of the DC power supply. Negative mother escaping into" or "positive and negative mother escaping into".
5.通信性：具有干接点输出端口和RS485通讯端口，可将监测信息实时上传至上位机或供其他监控设备采集、系统集成。5. Communication: With dry contact output port and RS485 communication port, the monitoring information can be uploaded to the host computer in real time or collected by other monitoring equipment and system integration.
附图说明Description of drawings
此处所说明的附图用来提供对本发明实施例的进一步理解，构成本申请的一部分，并不构成对本发明实施例的限定；The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of the application, and do not constitute a limitation to the embodiments of the present invention;
图1是本发明的系统示意图；Fig. 1 is a schematic diagram of the system of the present invention;
图2是本发明的结构示意图；Fig. 2 is a structural representation of the present invention;
图3是本发明的数据采集流程示意图；Fig. 3 is a schematic diagram of the data collection process of the present invention;
图4是本发明的数据采集单元电路结构示意图；Fig. 4 is a schematic diagram of the circuit structure of the data acquisition unit of the present invention;
图5是本发明的光电隔离单元电路结构示意图；Fig. 5 is a schematic diagram of the circuit structure of the photoelectric isolation unit of the present invention;
图6是本发明的CPU结构示意图；Fig. 6 is the CPU structural representation of the present invention;
图7是本发明的报警输出单元电路结构示意图；Fig. 7 is a schematic diagram of the circuit structure of the alarm output unit of the present invention;
图8是本发明的声光报警单元电路结构示意图；Fig. 8 is a schematic diagram of the circuit structure of the sound and light alarm unit of the present invention;
图9是本发明的电源模块电路结构示意图；Fig. 9 is a schematic diagram of the circuit structure of the power supply module of the present invention;
图10是本发明的时钟模块电路结构示意图；Fig. 10 is a schematic structural diagram of a clock module circuit of the present invention;
图11是本发明的存储器电路结构示意图；Fig. 11 is a schematic structural diagram of a memory circuit of the present invention;
图12是本发明的复位单元电路结构示意图；Fig. 12 is a schematic structural diagram of a reset unit circuit of the present invention;
图13是本发明的通讯单元电路结构示意图；Fig. 13 is a schematic diagram of the circuit structure of the communication unit of the present invention;
图14是本发明的软件流程示意图。Fig. 14 is a schematic diagram of the software flow of the present invention.
具体实施方式detailed description
本发明提供了一种交流窜入直流监测仪，解决了现有的交流窜入直流监测系统存在监测不准确，实现了通过本申请中的交流窜入直流监测仪能够准确的对交流窜入直流进行监测的技术效果。The invention provides an AC intrusion into DC monitor, which solves the inaccurate monitoring of the existing AC intrusion into DC monitoring system, and realizes that the AC intrusion into DC monitor in this application can accurately monitor the AC intrusion into DC The technical effect of monitoring.
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在相互不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the condition of not conflicting with each other, the embodiments of the present application and the features in the embodiments can be combined with each other.
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述范围内的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from the scope of this description. Therefore, the protection scope of the present invention is not limited by the following disclosure. limitations of specific examples.
请参阅图2所示，是本发明交流窜入直流监测仪的结构示意图。Please refer to FIG. 2 , which is a schematic structural diagram of the AC intrusion into DC monitor of the present invention.
如图2所示，本发明包括：数据采集单元、光电隔离单元、CPU、报警输出单元、声光报警单元、电源模块、时钟单元、存储器、复位单元、显示器、通讯单元。数据采集单元接收CPU的命令进行数据采集，并将采集的数据传输给CPU进行分析处理。光电隔离单元将高压与低压分开，提高系统和装置的安全性和稳定性。报警输出单元以及声光报警单元实现交流传入故障与系统故障的有效报警。电源模块为整个装置提供最基础的电能。时钟单元为CPU提供系统时钟依据，同时可以通过时钟单元手动校准系统时钟。CPU将分析得到的数据保存到存储器，存储器能接收CPU的指令提取查找存储器中的数据进行查看。CPU接收复位单元的指令进行复位。CPU接收用户在显示器上的按键指令进行相应程序，同时将所需显示的结构在显示器上进行显示。CPU能通过通讯接口与主机及其他监控设备联机通讯。As shown in Figure 2, the present invention includes: a data acquisition unit, a photoelectric isolation unit, a CPU, an alarm output unit, an audible and visual alarm unit, a power supply module, a clock unit, a memory, a reset unit, a display, and a communication unit. The data acquisition unit receives commands from the CPU to collect data, and transmits the collected data to the CPU for analysis and processing. The photoelectric isolation unit separates the high voltage from the low voltage, improving the safety and stability of the system and device. The alarm output unit and the acousto-optic alarm unit realize the effective alarm of AC incoming fault and system fault. The power module provides the most basic electric energy for the whole device. The clock unit provides the system clock basis for the CPU, and the system clock can be manually calibrated through the clock unit. The CPU saves the analyzed data to the memory, and the memory can receive instructions from the CPU to extract and search the data in the memory for viewing. The CPU receives an instruction to reset the unit to reset. The CPU receives the user's button commands on the display to execute the corresponding program, and at the same time displays the structure to be displayed on the display. The CPU can communicate online with the host computer and other monitoring equipment through the communication interface.
请参阅图3所示，是本发明交流窜入直流监测仪的数据采集流程示意图。Please refer to FIG. 3 , which is a schematic diagram of the data acquisition process of the AC intrusion into DC monitor of the present invention.
如图3所示，数据采集模块包括：电容、电源隔离、A/D转换电路、光电隔离电路。As shown in Figure 3, the data acquisition module includes: capacitors, power isolation, A/D conversion circuits, and photoelectric isolation circuits.
交流传入直流监测流程为：首先利用电容的“隔直通交”特性提取交流电压，通过放大器进行电源隔离，得到的信号传入A/D转换电路将模拟信号转换为数字信号。得到数字信号经过光电隔离电路，将高压与低压分开，保护系统和装置的安全性和稳定性，最终传入CPU进行分析计算。The AC-to-DC monitoring process is as follows: firstly, the AC voltage is extracted by using the “blocking DC and passing through” characteristics of the capacitor, and the power supply is isolated through the amplifier, and the obtained signal is sent to the A/D conversion circuit to convert the analog signal into a digital signal. The obtained digital signal passes through the photoelectric isolation circuit to separate the high voltage from the low voltage to protect the safety and stability of the system and device, and finally transmits it to the CPU for analysis and calculation.
直流电压采样流程为：首先提取母线电压，利用放大器进行电源隔离，得到的信号传入A/D转换电路将模拟信号转换为数字信号。得到数字信号经过光电隔离电路，将高压与低压分开，保护系统和装置的安全性和稳定性，最终传入CPU进行分析计算。The DC voltage sampling process is as follows: first extract the bus voltage, use the amplifier to isolate the power supply, and the obtained signal is sent to the A/D conversion circuit to convert the analog signal into a digital signal. The obtained digital signal passes through the photoelectric isolation circuit to separate the high voltage from the low voltage to protect the safety and stability of the system and device, and finally transmits it to the CPU for analysis and calculation.
纹波电压采样流程为：首先进行分离、提取纹波电压，利用放大器进行电源隔离，得到的信号传入A/D转换电路将模拟信号转换为数字信号。得到数字信号经过光电隔离电路，将高压与低压分开，保护系统和装置的安全性和稳定性，最终传入CPU进行分析计算。The ripple voltage sampling process is as follows: first, separate and extract the ripple voltage, use the amplifier to isolate the power supply, and the obtained signal is sent to the A/D conversion circuit to convert the analog signal into a digital signal. The obtained digital signal passes through the photoelectric isolation circuit to separate the high voltage from the low voltage to protect the safety and stability of the system and device, and finally transmits it to the CPU for analysis and calculation.
请参阅图4所示，是本发明交流窜入直流监测仪的数据采集单元电路结构示意图。Please refer to FIG. 4 , which is a schematic diagram of the circuit structure of the data acquisition unit of the AC intrusion into DC monitor of the present invention.
表1 ADS8361工作模式配置Table 1 ADS8361 working mode configuration
如图4所示为数据采集单元，ADC型号为ADS8361，它是美国德州仪器公司(TI)开发的一款高速、低能耗、最高采样速率为500kSPS的16位高速并行接口的高性能模数转换芯片。电容C13“隔直通交”采集交流信号，剩下两路分别采集直流信号以及纹波信号。运算放大器U6B、U10B、U10A隔离前后级电路，实现电源隔离，防止母线电压干扰电路。交流信号、直流信号、纹波信号分别输入ADC的CH B1+、CH B0+、CH A0+引脚。数字电源BVDD接+5V，模拟电源AVDD接+5VDC。控制信号M1接高电平，控制信号M0接低电平，控制信号A0接光电隔离单元的ADSA0信号，由CPU38引脚PC3(A11)的CPUA0信号控制。因此，如表1所示，当A0为高电平时，ADC采集A0、B0通道的纹波信号与直流信号，当A0为低电平时，ADC采集B1通道的交流信号。CONVST引脚是A/D转换脉冲，接隔离单元的CONVST信号，由CPU39引脚PC4(A12)的CPUCST信号控制A/D转换及数据读取，当CONVST从低电平切换到高电平时，A/D将从采样状态切换到保持模式，并且与外部时钟的状态无关。RD引脚是A/D串行输出的同步脉冲，接隔离单元的ADSRD信号，由CPU40引脚PC5(A13)的CPUAD信号控制。引脚是A/D的片选信号，接隔离单元的ADSCS信号，由CPU41引脚PC6(A14)的CPUCS信号控制，当为低电平时，串行输出A和串行输出B输出有效，当为低电平时，串行输出无效。CLOCK引脚用于输入采样时钟，接隔离单元的CLOCK信号，由CPU通过42引脚PC7(A15)的CPUCLK信号提供。BUSY引脚通过ABUSY信号输出给光电隔离单元，并通过CPUBUSY信号输出到CPU45引脚PA6(AD6)。SDATA A引脚串行输出，通过SDAA信号输出给光电隔离单元，并通过CPUSDA信号输出到CPU44引脚PA7(AD7)。As shown in Figure 4, the data acquisition unit, the ADC model is ADS8361, which is a high-speed, low-power consumption, 16-bit high-speed parallel interface high-performance analog-to-digital conversion developed by Texas Instruments (TI) with a maximum sampling rate of 500kSPS chip. Capacitor C13 collects AC signals by "blocking DC and traffic", and the remaining two channels collect DC signals and ripple signals respectively. The operational amplifiers U6B, U10B, and U10A isolate the front and rear circuits to realize power isolation and prevent the bus voltage from interfering with the circuit. The AC signal, DC signal, and ripple signal are respectively input to the CH B1+, CH B0+, and CH A0+ pins of the ADC. The digital power supply BVDD is connected to +5V, and the analog power supply AVDD is connected to +5VDC. The control signal M1 is connected to the high level, the control signal M0 is connected to the low level, the control signal A0 is connected to the ADSA0 signal of the photoelectric isolation unit, and is controlled by the CPUA0 signal of the CPU38 pin PC3 (A11). Therefore, as shown in Table 1, when A0 is at a high level, the ADC collects the ripple signal and DC signal of the A0 and B0 channels, and when A0 is at a low level, the ADC collects the AC signal of the B1 channel. The CONVST pin is the A/D conversion pulse, which is connected to the CONVST signal of the isolation unit. The A/D conversion and data reading are controlled by the CPUCST signal of the CPU39 pin PC4 (A12). When CONVST switches from low level to high level, The A/D will switch from sample state to hold mode independent of the state of the external clock. The RD pin is the synchronous pulse of the A/D serial output, connected to the ADSRD signal of the isolation unit, and controlled by the CPUAD signal of the CPU40 pin PC5 (A13). The pin is the A/D chip select signal, connected to the ADSCS signal of the isolation unit, controlled by the CPUCS signal of the CPU41 pin PC6 (A14), when When low, the serial output A and serial output B output is active, when When low, the serial output is inactive. The CLOCK pin is used to input the sampling clock, connected to the CLOCK signal of the isolation unit, and provided by the CPU through the CPUCLK signal of the 42-pin PC7 (A15). The BUSY pin is output to the photoelectric isolation unit through the ABUSY signal, and is output to the CPU45 pin PA6 (AD6) through the CPUBUSY signal. The SDATA A pin is serially output, output to the photoelectric isolation unit through the SDAA signal, and output to the CPU44 pin PA7 (AD7) through the CPUSDA signal.
请参阅图5所示，是本发明交流窜入直流监测仪的光电隔离单元电路结构示意图。Please refer to FIG. 5 , which is a schematic diagram of the circuit structure of the photoelectric isolation unit of the AC intrusion into DC monitor of the present invention.
如图5所示光电隔离单元由三个双通道高速逻辑输出光电耦合器HCPL2630，以及一个单通道高速逻辑输出光电耦合器6N137组成，光电隔离单元将高压与低压分开，保护系统和装置的安全性和稳定性。HCPL2630与6N137原理相同，通过信号输入使得发光二极管发光，经片内光通道传到光敏二极管，反向偏置的光敏管光照后导通，经电流-电压转换后送到与门的一个输入端，与门的另一个输入为使能端，当使能端为高时与门输出高电平，经输出三极管反向后光电隔离器输出低电平。电路中针对接收电路增加上拉电阻，同时增加电压+5V、VCC保证输出稳定可靠。第一块HCPL2630(U11)输入连接数据采集单元23、21引脚，接收SDAA、ABUSY信号，输出接CPU的44、45引脚，输出CPUSDA、CPUBUSY信号。第二块HCPL2630(U26)输入接CPU的42、41引脚，接收CPUCLK、CPUCS信号，输出连接数据采集单元20、19引脚，输出CLOCK、ADSCS信号。第三块HCPL2630(U23)输入接CPU的40、39引脚，接收CPUAD、CPUCST信号，输出连接数据采集单元18、17引脚，输出ADSRD、CONVST信号。6N137(U8)输入接CPU的38引脚，接收CPUA0信号，输出连接数据采集单元18、16引脚，输出ADSA0信号。As shown in Figure 5, the photoelectric isolation unit consists of three dual-channel high-speed logic output photocouplers HCPL2630 and a single-channel high-speed logic output photocoupler 6N137. The photoelectric isolation unit separates high voltage from low voltage to protect the safety of the system and devices and stability. The principle of HCPL2630 is the same as that of 6N137. The light-emitting diode is made to emit light through signal input, which is transmitted to the photosensitive diode through the on-chip optical channel, and the reverse-biased photosensitive tube is turned on after being illuminated. , the other input of the AND gate is the enabling terminal. When the enabling terminal is high, the AND gate outputs a high level, and the photoelectric isolator outputs a low level after the output transistor is reversed. In the circuit, a pull-up resistor is added for the receiving circuit, and the voltage +5V and VCC are increased at the same time to ensure stable and reliable output. The first HCPL2630 (U11) is input and connected to pins 23 and 21 of the data acquisition unit to receive SDAA and ABUSY signals, and the output is connected to pins 44 and 45 of the CPU to output CPUSDA and CPUBUSY signals. The input of the second HCPL2630 (U26) is connected to pins 42 and 41 of the CPU to receive CPUCLK and CPUCS signals, and the output is connected to pins 20 and 19 of the data acquisition unit to output CLOCK and ADSCS signals. The input of the third HCPL2630 (U23) is connected to pins 40 and 39 of the CPU to receive CPUAD and CPUCST signals, and the output is connected to pins 18 and 17 of the data acquisition unit to output ADSRD and CONVST signals. The input of 6N137 (U8) is connected to the 38 pin of the CPU, receives the CPUA0 signal, and the output is connected to the 18 and 16 pins of the data acquisition unit, and outputs the ADSA0 signal.
请参阅图6所示，是本发明交流窜入直流监测仪的CPU结构示意图。Please refer to FIG. 6 , which is a schematic diagram of the CPU structure of the AC intrusion into DC monitor of the present invention.
如图6所示CPU采用ATMEL公司的ATmega128L，它是一款基于AVR RISC结构的低功耗、高性能的8位微控制器芯片。ATmega128L具有以下特点：内部采用Harvard结构，在使用16M时钟时，速度可达16MIPS；具有丰富的资源和极低的能耗；具有片内128KB的程序存储器(Flash)，4KB的数据存储器(SRAM)，可外扩到64KB和4KB的E2PROM；方便开发与调试的接口，8个10位ADC通道，2个8位和2个16位硬件定时/计数器，8个PWM通道、可编程看门狗定时器和片上振荡器、片上模拟比较器，UART、SPI、I2C总线接口，JTAG口；具有6种不同等级的低能耗操作模式，每种模式具有不同的能耗；外形很小，可以减小节点的尺寸。As shown in Figure 6, the CPU adopts ATmega128L of ATMEL Company, which is an 8-bit microcontroller chip with low power consumption and high performance based on AVR RISC structure. ATmega128L has the following characteristics: It adopts Harvard structure internally, and when using 16M clock, the speed can reach 16MIPS; it has abundant resources and extremely low energy consumption; it has on-chip 128KB program memory (Flash), 4KB data memory (SRAM) , can be extended to 64KB and 4KB of E2 PROM; convenient development and debugging interface, 8 10-bit ADC channels, 2 8-bit and 2 16-bit hardware timer/counters, 8 PWM channels, programmable gate Dog timer and on-chip oscillator, on-chip analog comparator, UART, SPI, I2 C bus interface, JTAG port; with 6 different levels of low-energy operation modes, each mode has different energy consumption; small appearance, Node size can be reduced.
引脚PA1、PA2控制“常开无缘干接点”报警信号的输出。引脚PA6、PA7、PC3～PC7实现与数据采集单元的控制与通信，其中引脚PA6、PA7接收数据采集单元采集后经过光电隔离器处理后的信号；引脚PC3～PC7实现对数据采集单元的控制。引脚PB2～PB6、-实现与复位电路的控制通信，其中引脚PB2、PB4、PB6对复位电路进行控制，PB5是复位电路的串行输入，PB3接收复位电路的串行输出，引脚为复位输入引脚，接收复位电路的复位信号。引脚XTAL1和XTAL2分别为用作片内振荡器的反向放大器的输入和输出。PG0为声光报警电路的输入，控制声光报警器的工作。引脚PE0、PE1实现RS485通讯功能，PE0接收外部通讯信号，PE1控制通讯信号的接受与否。引脚PC0、PC1、PG1、PD6实现与时钟电路的控制与通信，其中引脚PC1、PD6接时钟电路的串行输入，引脚PC0、PG1接时钟电路的串行输入/输出脚。引脚PG1、PD7、PD6实现与存储器的控制与通信，其中引脚PG1接存储器的串行输入/输出脚实现数据的存储与读取，引脚PD7、PD6实现CPU对于存储器的控制。Pins PA1 and PA2 control the output of the alarm signal of "normally open non-connected dry contact". Pins PA6, PA7, PC3~PC7 realize the control and communication with the data acquisition unit, among which the pins PA6 and PA7 receive the signal collected by the data acquisition unit and processed by the photoelectric isolator; the pins PC3~PC7 realize the control and communication of the data acquisition unit control. Pins PB2~PB6, -Realize the control communication with the reset circuit, where pins PB2, PB4, and PB6 control the reset circuit, PB5 is the serial input of the reset circuit, PB3 receives the serial output of the reset circuit, pin It is the reset input pin, which receives the reset signal of the reset circuit. Pins XTAL1 and XTAL2 are the input and output, respectively, of the inverting amplifier used as the on-chip oscillator. PG0 is the input of the sound and light alarm circuit to control the work of the sound and light alarm. Pins PE0 and PE1 realize the RS485 communication function, PE0 receives external communication signals, and PE1 controls whether the communication signals are accepted or not. Pins PC0, PC1, PG1, PD6 realize the control and communication with the clock circuit, where pins PC1, PD6 are connected to the serial input of the clock circuit, and pins PC0, PG1 are connected to the serial input/output pin of the clock circuit. The pins PG1, PD7, and PD6 realize the control and communication with the memory, wherein the pin PG1 is connected to the serial input/output pin of the memory to realize data storage and reading, and the pins PD7 and PD6 realize the control of the memory by the CPU.
请参阅图7所示，是本发明交流窜入直流监测仪的报警输出单元电路结构示意图。Please refer to FIG. 7 , which is a schematic diagram of the circuit structure of the alarm output unit of the AC intrusion into DC monitor of the present invention.
如图7所示为报警输出电路，报警输出电路实现交流窜入、系统故障的报警功能，其输入与CPU的PA1、PA2引脚相连。当出现交流窜入故障或者系统故障时，CPU通过WAR1、WAR2报警信号变为高电平，三极管导通，继电器线圈通电，常开开关闭合，实现交流传入故障以及系统故障的报警功能。As shown in Figure 7, it is the alarm output circuit. The alarm output circuit realizes the alarm function of AC intrusion and system failure, and its input is connected with the PA1 and PA2 pins of the CPU. When there is an AC intrusion fault or system fault, the CPU turns the alarm signals of WAR1 and WAR2 into a high level, the triode is turned on, the relay coil is energized, and the normally open switch is closed to realize the alarm function of AC incoming fault and system fault.
请参阅图8所示，是本发明交流窜入直流监测仪的声光报警单元电路结构示意图。Please refer to FIG. 8 , which is a schematic diagram of the circuit structure of the sound and light alarm unit of the AC intrusion into DC monitor of the present invention.
如图8所示为声光报警电路，声光报警电路实现交流窜入、系统故障的声光报警功能，其输入与CPU的PG0引脚相连.当发生交流窜入故障或者系统故障时，CPU通过ALMSP信号变为高电平，三极管导通，声光报警器通电工作，实现声光报警功能。As shown in Figure 8, the sound and light alarm circuit realizes the sound and light alarm function of AC intrusion and system failure, and its input is connected to the PG0 pin of the CPU. When an AC intrusion failure or system failure occurs, the CPU When the ALMSP signal becomes high level, the triode is turned on, and the sound and light alarm is energized to work, realizing the sound and light alarm function.
请参阅图9所示，是本发明交流窜入直流监测仪的电源单元电路结构示意图。Please refer to FIG. 9 , which is a schematic diagram of the circuit structure of the power supply unit of the AC intrusion into DC monitor of the present invention.
电源模块为整个装置提供最基础的电能，直接影响到整个系统的工作性能。电源模块型号为IF1205S-1W，电源模块输入为+12V电压，能够提供5V、9V、12V、15V的输出。The power module provides the most basic electric energy for the whole device, which directly affects the working performance of the whole system. The model of the power module is IF1205S-1W, the input voltage of the power module is +12V, and it can provide the output of 5V, 9V, 12V and 15V.
请参阅图10所示，是本发明交流窜入直流监测仪的时钟单元电路结构示意图。Please refer to FIG. 10 , which is a schematic structural diagram of the clock unit circuit of the AC intrusion into DC monitor of the present invention.
如图10所示为时钟模块，时钟模块选择SD2400EPI时钟芯片，它是一种具有内置晶振、支持IIC串行接口的高精度实时时钟芯片，CPU可通过5位地址寻址来读写片内32字节寄存器的数据(包括时间寄存器、报警寄存器、控制寄存器、通用SRAM寄存器)。VBAT为外加备用电池引脚，VDD为正电源引脚。SCL引脚为串行时钟输入脚，CPU通过PC2(A10)引脚的SCL信号进行控制。SDA引脚为串行数据输入/输出脚，CPU通过PC0(A8)的SDA信号进行数据读写。NC/SDAE引脚为NVSRAM串行数据输入/输出引脚，CPU通过PG1引脚的SDAE信号进行读写。NC/SCLE引脚为NVSRAM串行时钟输入脚，CPU通过PD6(T1)引脚的SCLE信号进行控制。As shown in Figure 10, it is the clock module. The clock module chooses SD2400EPI clock chip, which is a high-precision real-time clock chip with built-in crystal oscillator and supports IIC serial interface. The CPU can read and write the internal 32 Data of byte registers (including time registers, alarm registers, control registers, and general-purpose SRAM registers). VBAT is an external backup battery pin, and VDD is a positive power supply pin. The SCL pin is the serial clock input pin, and the CPU is controlled by the SCL signal of the PC2 (A10) pin. The SDA pin is a serial data input/output pin, and the CPU reads and writes data through the SDA signal of PC0 (A8). NC/SDAE pin is NVSRAM serial data input/output pin, CPU through PG1 The SDAE signal of the pin is used for reading and writing. The NC/SCLE pin is the NVSRAM serial clock input pin, and the CPU is controlled by the SCLE signal of the PD6 (T1) pin.
请参阅图11所示，是本发明交流窜入直流监测仪的存储器电路结构示意图。Please refer to FIG. 11 , which is a schematic structural diagram of the memory circuit of the AC intrusion into DC monitor of the present invention.
如图11所示为存储器，存储器选择FM24W256-G，它是一种铁电存储器(FRAM)，容量为256K bit。FRAM是由RAMTRON公司研制的新型存存储器，它的核心技术是铁电晶体材料，具有RAM和ROM的优点，读写速度快并可以像非易失性存储器一样使用。WP引脚为写保护引脚，由CPU通过PD7(T2)引脚的WP24信号进行控制。SCL引脚为串行时钟输入脚，CPU通过PD6(T1)引脚的SCLE信号进行控制。SDA引脚为串行数据输入/输出脚，CPU通过PG1的SDAE信号进行数据读写。As shown in Figure 11, it is the memory, and the memory is FM24W256-G, which is a ferroelectric memory (FRAM) with a capacity of 256K bits. FRAM is a new type of storage memory developed by RAMTRON. Its core technology is ferroelectric crystal material, which has the advantages of RAM and ROM. It has fast read and write speed and can be used like a non-volatile memory. The WP pin is a write protection pin, which is controlled by the CPU through the WP24 signal of the PD7 (T2) pin. The SCL pin is the serial clock input pin, and the CPU is controlled by the SCLE signal of the PD6 (T1) pin. The SDA pin is a serial data input/output pin, and the CPU passes PG1 The SDAE signal for data reading and writing.
请参阅图12所示，是本发明交流窜入直流监测仪的复位单元电路结构示意图。Please refer to FIG. 12 , which is a schematic structural diagram of the circuit structure of the reset unit of the AC intrusion into DC monitor of the present invention.
如图12所示为复位电路，复位电路选择XICOR公司的x5043芯片，它具有上电复位、低电压复位控制以及看门狗定时器功能。上电复位功能是指加电时芯片内部的上电复位电路被激活，从而使RET引脚有效，上电复位功能可避免CPU在电压不足或振荡器未稳定的情况下工作。低电位复位控制功能是指工作时，低电压复位电路可以监测供电电压VCC，若电源电压跌落至预置的最小值以下时，RET引脚有效，从而避免CPU在电源失效或断开的情况下工作。看门狗定时器的作用是通过监视引脚输入情况来监视CPU是否激活，由于工作时CPU必须周期性的触发引脚以避免RET信号激活而使电路复位，所以引脚必须在看门狗超时时间终止之前受到由高至低信号的触发，否则进行复位操作。引脚为片选引脚，由CPU通过PB4(OC0)引脚的CS5043信号进行控制。SO引脚为串行输出引脚，CPU通过SO5043信号由PB3(MISO)引脚进行接收。引脚为写保护引脚，由CPU通过PB2(MOSI)引脚的WP5043信号进行控制。引脚为复位输出引脚，连接CPU的引脚，控制CPU的复位操作。SCK引脚为串行时钟引脚，CPU通过PB6(OC1B)引脚的SCK5043信号进行输入。SI引脚为串行输入引脚，CPU通过PB5(OC1A)引脚的SI5043信号进行输入。Figure 12 shows the reset circuit. The reset circuit chooses the x5043 chip of XICOR Company, which has the functions of power-on reset, low-voltage reset control and watchdog timer. The power-on reset function means that the power-on reset circuit inside the chip is activated when the power is turned on, so that the RET pin is valid. The power-on reset function can prevent the CPU from working when the voltage is insufficient or the oscillator is not stable. The low-potential reset control function means that when working, the low-voltage reset circuit can monitor the power supply voltage VCC. If the power supply voltage drops below the preset minimum value, the RET pin will be active, thereby preventing the CPU from power failure or disconnection. Work. The role of the watchdog timer is to monitor the Pin input to monitor whether the CPU is active, because the CPU must be triggered periodically during work pin to prevent the RET signal from activating and resetting the circuit, so The pin must be toggled by a high-to-low signal before the watchdog timeout expires, otherwise a reset occurs. The pin is a chip select pin, which is controlled by the CPU through the CS5043 signal of the PB4 (OC0) pin. The SO pin is a serial output pin, and the CPU receives it from the PB3 (MISO) pin through the SO5043 signal. The pin is a write protection pin, which is controlled by the CPU through the WP5043 signal of the PB2 (MOSI) pin. The pin is a reset output pin, connected to the CPU's Pin that controls the reset operation of the CPU. The SCK pin is a serial clock pin, and the CPU inputs it through the SCK5043 signal of the PB6 (OC1B) pin. The SI pin is a serial input pin, and the CPU inputs it through the SI5043 signal of the PB5 (OC1A) pin.
请参阅图13所示，是本发明交流窜入直流监测仪的通讯单元电路结构示意图。Please refer to FIG. 13 , which is a schematic diagram of the circuit structure of the communication unit of the AC intrusion into DC monitor of the present invention.
如图13所示为RS485通讯模块，RS485通讯模块选择SN75LBC184DR芯片，它是符合SN5176行业标准的差分收发器，内置高能量瞬变噪声保护装置。通讯模块具有光电隔离单元，能够实现光电隔离，光电隔离单元有两个单通道高速逻辑输出光电耦合器6N137组成。RO引脚通过光电隔离单元与CPU的PE0(PDI/RXD0)引脚相连，与DE引脚通过光电隔离单元与CPU的PE1(PDO/TXD0)引脚相连，VCC引脚接电源，A、B引脚接RS485接口端子。当TXD0为高电平时光电隔离器U20不导通，D11为高电平，三极管Q7导通，使能DE、为低电平，此时RO输出数据，CPU通过RXD0信号读取信息。As shown in Figure 13, the RS485 communication module is selected. The SN75LBC184DR chip is selected for the RS485 communication module. It is a differential transceiver conforming to the SN5176 industry standard and has a built-in high-energy transient noise protection device. The communication module has a photoelectric isolation unit, which can realize photoelectric isolation. The photoelectric isolation unit consists of two single-channel high-speed logic output photocouplers 6N137. The RO pin is connected to the PE0 (PDI/RXD0) pin of the CPU through the photoelectric isolation unit, The DE pin is connected to the PE1 (PDO/TXD0) pin of the CPU through the photoelectric isolation unit, the VCC pin is connected to the power supply, and the A and B pins are connected to the RS485 interface terminal. When TXD0 is at a high level, the photoelectric isolator U20 is not turned on, D11 is at a high level, and the transistor Q7 is turned on, enabling DE, It is low level, at this time RO outputs data, and CPU reads information through RXD0 signal.
请参阅图14所示，是本发明交流窜入直流监测仪的软件流程示意图。Please refer to FIG. 14 , which is a schematic diagram of the software flow of the AC intrusion into DC monitor of the present invention.
如图14所示，软件系统流程为：系统开始，系统初始化配置，包括：时钟配置，串口初始化，存储控制器初始化，显示器控制器初始化等；初始化后系统进入主程序，显示器开始显示主界面，串口处于接受状态，系统按键监测处于激活状态；用户操作或者接收到其他监控设备的指令时，系统界面进行相应的反应，同时当用户操作进入实时监控界面时，数据采集模块启动，软件系统控制数字系统进行数据采集。数据采集缓存与数字系统后，软件系统读取数字系统采集的数据，并进行分析计算；最后根据用户所设定的报警门限值进行存储、报警和数据上传等处理，并在显示器上进行显示。As shown in Figure 14, the software system flow is: system start, system initialization configuration, including: clock configuration, serial port initialization, storage controller initialization, display controller initialization, etc.; after initialization, the system enters the main program, and the display starts to display the main interface. The serial port is in the receiving state, and the system key monitoring is in the active state; when the user operates or receives instructions from other monitoring equipment, the system interface responds accordingly, and at the same time, when the user operates into the real-time monitoring interface, the data acquisition module starts, and the software system controls the digital The system collects data. After the data is collected and cached with the digital system, the software system reads the data collected by the digital system and performs analysis and calculation; finally, it performs storage, alarm and data upload processing according to the alarm threshold value set by the user, and displays it on the display .
软件系统包括以下几个模块：实时监测、历史记录、报警设置、时钟校准、通讯参数、系统说明。The software system includes the following modules: real-time monitoring, historical records, alarm settings, clock calibration, communication parameters, and system description.
实现监测：实时监测交流电压、直流电压以及纹波系数，并对交流窜入故障进行报警，同时显示正负母线对地电压波形，为交流窜入正负母线之间时提供判定依据。Realize monitoring: monitor AC voltage, DC voltage and ripple coefficient in real time, and give an alarm for AC intrusion faults, and display the voltage waveform of the positive and negative busbars to ground at the same time, providing a basis for judging when AC intrudes into the positive and negative busbars.
历史记录：查询历史报警记录，包括报警时间、交流电压值、直流电压值、纹波系数及正、负母线对地电压波形图。仪器最大可存储最近1000条报警记录。Historical records: query historical alarm records, including alarm time, AC voltage value, DC voltage value, ripple coefficient, and positive and negative bus-to-ground voltage waveforms. The instrument can store up to 1000 recent alarm records.
报警设置：设定交流窜入报警阀值，当窜入交流电压超过此阀值，仪器及报警并存储报警记录。设定范围：5-300V。Alarm setting: set the alarm threshold of AC intrusion, when the intrusion AC voltage exceeds this threshold, the instrument will alarm and store the alarm record. Setting range: 5-300V.
时钟校准：手动校准系统时钟。Clock Calibration: Manually calibrate the system clock.
通讯参数：设定通讯参数，包括通讯波特率以及本机地址码。Communication parameters: set communication parameters, including communication baud rate and local address code.
系统说明：提供本机编号、硬件版本、软件版本和技术支持电话等信息。System Description: Provide information such as the machine number, hardware version, software version, and technical support telephone number.
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710731621.0ACN107450034A (en) | 2017-08-23 | 2017-08-23 | Direct current monitor is scurried into one kind exchange |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710731621.0ACN107450034A (en) | 2017-08-23 | 2017-08-23 | Direct current monitor is scurried into one kind exchange |
| Publication Number | Publication Date |
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| CN107450034Atrue CN107450034A (en) | 2017-12-08 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710731621.0APendingCN107450034A (en) | 2017-08-23 | 2017-08-23 | Direct current monitor is scurried into one kind exchange |
| Country | Link |
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