CN109270482A - Voltage transformer accuracy of measuring on-line evaluation method and terminal device - Google Patents

Voltage transformer accuracy of measuring on-line evaluation method and terminal device Download PDF

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CN109270482A
CN109270482A CN201811359150.6A CN201811359150A CN109270482A CN 109270482 A CN109270482 A CN 109270482A CN 201811359150 A CN201811359150 A CN 201811359150A CN 109270482 A CN109270482 A CN 109270482A
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voltage transformer
line loss
accuracy
metering
capacitance
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CN109270482B (en
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曹晓波
申洪涛
史轮
马红明
阎超
周忠良
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
Marketing Service Center of State Grid Hebei Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention is suitable for Electric Energy Metering Technology field, provides a kind of voltage transformer accuracy of measuring on-line evaluation method and terminal device.The described method includes: obtaining the critical point data of data collection system acquisition, obtain the standard critical point data of compbined test management platform storage, determine the parameter variation tendency of the capacitance of voltage transformer, dielectric loss and corresponding line loss according to critical point data and standard critical point data, and according to capacitance, the parameter variation tendency of dielectric loss and corresponding line loss determine the accuracy of measuring of voltage transformer.After adopting the above scheme, while improving energy metering operation management level and reliability, on-line condition monitoring, fault diagnosis and the status assessment of entire metering gateway device are realized in extension, are assessed for the state-detection of energy metering, intelligent diagnostics and are provided strong support.

Description

电压互感器计量准确度在线评价方法及终端设备Online evaluation method and terminal device for measuring accuracy of voltage transformer

技术领域Technical field

本发明属于电能计量技术领域,尤其涉及一种电压互感器计量准确度在线评价方法及终端设备。The invention belongs to the technical field of electric energy measurement, and particularly relates to an online evaluation method and terminal device for measuring accuracy of a voltage transformer.

背景技术Background technique

目前,根据电能计量装置检定规程的规定,对于各类计量装置采用周期检测方式进行检验,但实际发供电贸易结算中关口计量装置每年都会发生计量装置故障或超差等问题,其中一个重要因素就是电容式电压互感器的故障和超差。At present, according to the provisions of the verification rules of electric energy metering devices, periodic inspection methods are used for various types of metering devices. However, in the actual power supply trade settlement, the metering devices in the gateways will have problems such as metering device failure or out-of-tolerance every year. One of the important factors is Fault and out of tolerance for capacitive voltage transformers.

35kV及以上电压等级的测量用电压互感器广泛使用CVT(Continuously VariableTransmission,电容式电压互感器),这种型式的电压互感器相比电磁式互感器而言,误差稳定性不高,极易出现超差现象,且在检测周期内无有效手段对各类计量装置误差变化进行监控,电压互感器在检验周期内故障或超差成为影响计量准确度的一个最重要因素,且由于其物理特性在检测周期内使误差电量不断扩大,影响到电量交易的公平与准确,严重情况甚至会威胁电网安全运行。CVT (Continuously Variable Transmission) is widely used in voltage transformers for voltage measurement of 35kV and above. This type of voltage transformer is less prone to error than electromagnetic transformers. Out-of-tolerance phenomenon, and there is no effective means to monitor the error variation of various metering devices during the detection period. The fault or out-of-tolerance of the voltage transformer in the inspection cycle becomes one of the most important factors affecting the measurement accuracy, and because of its physical characteristics During the detection cycle, the error power is continuously expanded, which affects the fairness and accuracy of the electricity trading, and the serious situation may even threaten the safe operation of the power grid.

发明内容Summary of the invention

有鉴于此,本发明实施例提供了一种电压互感器计量准确度在线评价方法及终端设备,以解决现有技术中由于CVT物理特性在检测周期内使误差电量不断扩大,影响到电量交易的公平与准确,严重情况甚至会威胁电网安全运行的问题。In view of this, the embodiment of the present invention provides an online evaluation method and a terminal device for measuring the accuracy of a voltage transformer, so as to solve the problem that the error power is continuously expanded during the detection period due to the physical characteristics of the CVT in the prior art, which affects the power transaction. Fair and accurate, serious situations may even threaten the safe operation of the grid.

本发明实施例的第一方面提供了一种电压互感器计量准确度在线评价方法,包括:A first aspect of the embodiments of the present invention provides an online evaluation method for measuring accuracy of a voltage transformer, including:

获取数据采集系统采集的关口数据;Obtaining the gate data collected by the data acquisition system;

获取综合试验管理平台存储的标准关口数据;Obtain standard gateway data stored by the comprehensive test management platform;

根据关口数据和标准关口数据确定电压互感器的电容量、介损及相应线损的参量变化趋势,并根据的电容量、介损及相应线损的参量变化趋势确定电压互感器的计量准确度。According to the gateway data and the standard gateway data, the change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer is determined, and the measurement accuracy of the voltage transformer is determined according to the change trend of the capacitance, dielectric loss and corresponding line loss. .

作为进一步的技术方案,所述方法还包括:As a further technical solution, the method further includes:

电压互感器的计量关口与参考点之间线路损耗的线损率表达式为:The line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=r-f1+f2,其中,r'为采集系统显示线损率,r为线路实际线损率,f1为计量点与电压互感器比差,f2为参考点与电压互感器比差。r'=rf 1 +f 2 , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f 1 is the difference between the metering point and the voltage transformer, and f 2 is the reference point and voltage transformer Comparison.

作为进一步的技术方案,所述电压互感器包括电容分压单元和电磁单元,所述电容分压单元包括并联的膜纸复合介质或并联的全膜介质。As a further technical solution, the voltage transformer comprises a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit comprises a parallel film-membrane composite medium or a parallel full-film medium.

作为进一步的技术方案,所述电压互感器的绝缘结构对计量性能的影响包括内绝缘性能、外绝缘性能以及老化性能。As a further technical solution, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

作为进一步的技术方案,所述方法还包括:As a further technical solution, the method further includes:

根据预存的准确度判断标准判断电压互感器的计量准确度是否合格;Judging whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard;

若判定电压互感器的计量准确度不合格,发送报警指令至报警装置,所述报警指令用于指示所述报警装置报警。If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

本发明实施例的第二方面提供了一种电压互感器计量准确度在线评价装置,包括:A second aspect of the embodiments of the present invention provides an online evaluation device for measuring accuracy of a voltage transformer, including:

关口数据获取模块,用于获取数据采集系统采集的关口数据;a gateway data acquisition module, configured to acquire gateway data collected by the data acquisition system;

标准关口数据获取模块,用于获取综合试验管理平台存储的标准关口数据;a standard gateway data acquisition module for obtaining standard gateway data stored by the comprehensive test management platform;

计量准确度确定模块,用于根据关口数据和标准关口数据确定电压互感器的电容量、介损及相应线损的参量变化趋势,并根据电压互感器的电容量、介损及相应线损的参量变化趋势确定电压互感器的计量准确度。The measurement accuracy determining module is configured to determine the capacitance, dielectric loss and corresponding line loss parameter variation trend of the voltage transformer according to the gateway data and the standard gateway data, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer The parametric change trend determines the measurement accuracy of the voltage transformer.

作为进一步的技术方案,所述装置还包括:As a further technical solution, the device further includes:

线损率确定模块,用于电压互感器的计量关口与参考点之间线路损耗的线损率表达式为:The line loss rate determination module, the line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=r-f1+f2,其中,r'为采集系统显示线损率,r为线路实际线损率,f1为计量点与电压互感器比差,f2为参考点与电压互感器比差。r'=rf 1 +f 2 , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f 1 is the difference between the metering point and the voltage transformer, and f 2 is the reference point and voltage transformer Comparison.

作为进一步的技术方案,所述电压互感器包括电容分压单元和电磁单元,所述电容分压单元包括并联的膜纸复合介质或并联的全膜介质。As a further technical solution, the voltage transformer comprises a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit comprises a parallel film-membrane composite medium or a parallel full-film medium.

本发明实施例的第三方面提供了一种电压互感器计量准确度在线评价终端设备,包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序,所述处理器执行所述计算机程序时实现如上述第一方面所述的方法。A third aspect of the embodiments of the present invention provides a voltage transformer measurement accuracy online evaluation terminal device, including a memory, a processor, and a computer program stored in the memory and operable on the processor, The method as described in the first aspect above is implemented when the processor executes the computer program.

本发明实施例的第四方面提供了一种计算机可读存储介质,所述计算机可读存储介质存储有计算机程序,所述计算机程序被处理器执行时实现如上述第一方面所述的方法。A fourth aspect of an embodiment of the present invention provides a computer readable storage medium storing a computer program that, when executed by a processor, implements the method of the first aspect described above.

本发明实施例与现有技术相比存在的有益效果是:采用上述方案后,能根据关口数据和标准关口数据确定电压互感器的电容量、介损及相应线损的参量变化趋势,并根据的电容量、介损及相应线损的参量变化趋势确定电压互感器的计量准确度,提升了关口计量运维管理水平和可靠性的同时,扩展实现整个计量关口设备(包括电能表、电流电压互感器)的在线状态监测、故障诊断和状态评估,为关口计量的状态检测、智能诊断评估提供了强有力的支撑。Compared with the prior art, the embodiment has the beneficial effects that: after adopting the above solution, the capacitance, the dielectric loss and the corresponding line loss parameter variation trend of the voltage transformer can be determined according to the gateway data and the standard gateway data, and according to The change trend of the capacitance, dielectric loss and corresponding line loss determines the measurement accuracy of the voltage transformer, improves the level and reliability of the gate metering operation and maintenance management, and expands the entire metering device (including the energy meter, current and voltage). On-line condition monitoring, fault diagnosis and state assessment of the transformers provide strong support for state detection and intelligent diagnostic evaluation of gateway metering.

附图说明DRAWINGS

为了更清楚地说明本发明实施例中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

图1是本发明实施例提供的一种电压互感器计量准确度在线评价方法的步骤流程图;1 is a flow chart of steps of an online evaluation method for measuring accuracy of a voltage transformer according to an embodiment of the present invention;

图2是本发明另一实施例提供的一种电压互感器计量准确度在线评价方法的步骤流程图;2 is a flow chart of steps of an online evaluation method for measuring accuracy of a voltage transformer according to another embodiment of the present invention;

图3是本发明实施例提供的一种电压互感器计量准确度在线评价装置的结构示意图;3 is a schematic structural diagram of an online evaluation device for measuring accuracy of a voltage transformer according to an embodiment of the present invention;

图4是本发明实施例提供的一种电压互感器计量准确度在线评价终端设备的示意图;4 is a schematic diagram of an online evaluation terminal device for measuring accuracy of a voltage transformer according to an embodiment of the present invention;

图5是本发明实施例提供的系统配置连接示意图;FIG. 5 is a schematic diagram of a system configuration connection according to an embodiment of the present invention; FIG.

图6是本发明实施例提供的电压互感器基本电气连接示意图;6 is a schematic diagram of a basic electrical connection of a voltage transformer according to an embodiment of the present invention;

图7是本发明实施例提供的电压互感器绝缘电气连接示意图;7 is a schematic diagram of an insulated electrical connection of a voltage transformer according to an embodiment of the present invention;

图8是本发明另一实施例提供的电压互感器绝缘电气连接示意图;FIG. 8 is a schematic diagram of an insulated electrical connection of a voltage transformer according to another embodiment of the present invention; FIG.

图9是本发明实施例提供的电压互感器绝缘电气连接示意图。FIG. 9 is a schematic diagram of an insulated electrical connection of a voltage transformer according to an embodiment of the present invention.

具体实施方式Detailed ways

以下描述中,为了说明而不是为了限定,提出了诸如特定系统结构、技术之类的具体细节,以便透彻理解本发明实施例。然而,本领域的技术人员应当清楚,在没有这些具体细节的其它实施例中也可以实现本发明。在其它情况中,省略对众所周知的系统、装置、电路以及方法的详细说明,以免不必要的细节妨碍本发明的描述。In the following description, for purposes of illustration and description However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the invention.

为了说明本发明所述的技术方案,下面通过具体实施例来进行说明。In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.

如图1所示,为本发明实施例提供的一种电压互感器计量准确度在线评价方法的步骤流程图,包括:As shown in FIG. 1 , a flow chart of steps for an online evaluation method for measuring accuracy of a voltage transformer according to an embodiment of the present invention includes:

步骤S101,获取数据采集系统采集的关口数据。Step S101: Acquire a gateway data collected by the data collection system.

步骤S102,获取综合试验管理平台存储的标准关口数据。Step S102, obtaining standard gateway data stored by the comprehensive test management platform.

步骤S103,根据关口数据和标准关口数据确定电压互感器的电容量、介损及相应线损的参量变化趋势,并根据的电容量、介损及相应线损的参量变化趋势确定电压互感器的计量准确度。Step S103, determining, according to the gateway data and the standard gateway data, a change trend of the capacitance, the dielectric loss and the corresponding line loss of the voltage transformer, and determining the voltage transformer according to the change trend of the capacitance, the dielectric loss and the corresponding line loss. Measurement accuracy.

具体的,本方案适用于关口计量电容式电压互感器计量准确度相关参量分析,进而对在运CVT准确度变化工况实现远程在线评价预警,以评价预警机制代替难以推广实现的在线实时检验方式,建立10种以上内外因素参量与计量特性变化关系模型,形成丰富有力的后台计算模型库,系统自动获取实时数据与试验数据,自动分析综合误差,并给出标准条件下实际误差评价值,评价CVT综合状态,对异常给出不同等级报警,自动生成线下生产计划。使此评估系统达成提升关口计量运维管理水平和可靠性的同时,扩展实现整个计量关口设备包括电能表、电流电压互感器的在线状态监测、故障诊断和状态评估,为关口计量的状态检测、智能诊断评估提供了强有力的支撑。Specifically, the scheme is applicable to the correlation parameter analysis of the measurement accuracy of the capacitance measuring voltage transformer, and then realizes the remote online evaluation and early warning for the accuracy of the CVT in operation, and evaluates the early warning mechanism to replace the online real-time inspection method that is difficult to promote. Establish more than 10 kinds of internal and external factors and measurement characteristics change model, form a rich and powerful background calculation model library, the system automatically obtains real-time data and test data, automatically analyzes the comprehensive error, and gives the actual error evaluation value under standard conditions, evaluation The integrated state of the CVT gives different levels of alarms to the anomalies and automatically generates an offline production plan. This assessment system achieves the improvement of the level and operation management level and reliability of the gateway, and expands the online measurement, fault diagnosis and status assessment of the entire metering device including the energy meter and current and voltage transformers. Intelligent diagnostic assessment provides a strong support.

此外,如图5所示,在一个具体事例中,所述方法还包括:In addition, as shown in FIG. 5, in a specific example, the method further includes:

电压互感器的计量关口与参考点之间线路损耗的线损率表达式为:The line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=r-f1+f2,其中,r'为采集系统显示线损率,r为线路实际线损率,f1为计量点与电压互感器比差,f2为参考点与电压互感器比差。r'=rf 1 +f 2 , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f 1 is the difference between the metering point and the voltage transformer, and f 2 is the reference point and voltage transformer Comparison.

具体的,此外,在一个具体事例中,从系统配置来说,根据DL/T 448-2016《电能计量装置技术管理规程》,贸易结算用的电能计量装置原则上应设置在供电设施的产权分界处,发电企业上网线路、电网企业间的联络线路和专线供电电路的另一端应配置考核用电能计量装置,计量关口与参考点之间线路损耗一般来说是固定不变的,由其线路参数决定。但当计量准确度发生变化时,采集系统后台数据计算所得线损率会产生相应变化。Specifically, in a specific case, from the system configuration, according to the DL/T 448-2016 "Technical Management Regulations for Electric Energy Metering Devices", the energy metering device for trade settlement should be set in principle in the property rights boundary of the power supply facility. At the same time, the power line of the power generation enterprise, the communication line between the power grid enterprises and the other end of the dedicated line power supply circuit shall be equipped with an energy metering device for assessment. The line loss between the metering gate and the reference point is generally fixed, and the line is fixed. The parameters are determined. However, when the measurement accuracy changes, the line loss rate calculated by the background data of the acquisition system will change accordingly.

此外,在一个具体事例中,所述电压互感器包括电容分压单元和电磁单元,所述电容分压单元包括并联的膜纸复合介质或并联的全膜介质,其基本电气原理图如图6所示。In addition, in a specific example, the voltage transformer comprises a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit comprises a parallel film-membrane composite medium or a parallel full-film medium, and the basic electrical schematic diagram thereof is shown in FIG. 6 . Shown.

此外,在一个具体事例中,所述电压互感器的绝缘结构对计量性能的影响包括内绝缘性能、外绝缘性能以及老化性能。Moreover, in a specific example, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

此外,如图7、图8和图9所示,在一个具体事例中,CVT绝缘结构对其计量性能的影响主要需要考虑内绝缘、外绝缘以及老化、温湿度的影响,对设备模型引入漏电流、杂散电容、工频电阻等参数的影响,其中,Zm为激励阻抗,Zd为阻尼阻抗,ZL为负荷阻抗,电介质并联中C1为CVT高压电容,C2为CVT低压电容,R1、R2代表设备综合绝缘电阻,C1'、C2'分别为高压、低压综合电容,考虑杂散电容等因素影响。CVT在运行过程中,由于外界污秽、温湿度以及老化作用影响,可能会出现外绝缘电阻下降,电容漏电容增大以及电容局部击穿导致电容量发生变化。In addition, as shown in FIG. 7, FIG. 8 and FIG. 9, in a specific case, the influence of the CVT insulation structure on its metering performance mainly needs to consider the effects of internal insulation, external insulation, aging, temperature and humidity, and introduce leakage into the equipment model. The influence of current, stray capacitance, power frequency resistance and other parameters, where Zm is the excitation impedance, Zd is the damping impedance, ZL is the load impedance, C 1 is the CVT high voltage capacitor in the dielectric parallel connection, and C 2 is the CVT low voltage capacitor, R1 R2 represents the comprehensive insulation resistance of the equipment. C 1 ' and C 2 ' are high-voltage and low-voltage integrated capacitors respectively, which are considered by factors such as stray capacitance. During the operation of CVT, due to external pollution, temperature and humidity, and aging effects, external insulation resistance may decrease, capacitance leakage capacitance increases, and partial breakdown of capacitance causes capacitance to change.

对于RC并联模型介质,其介质损耗为其中,δ为介质损耗角,不带负荷时,输出U0与US关系如下所示:For RC parallel model media, the dielectric loss is Where δ is the dielectric loss angle, and when there is no load, the relationship between output U 0 and U S is as follows:

其中, among them,

对输入输出关系图等效为基本RC电路,则等效R、C为:For the input-output relationship diagram equivalent to the basic RC circuit, the equivalent R, C is:

对于设备负荷,忽略其变化影响,忽略电磁单元回路阻抗,设总等效负荷为ZL’,对模型进一步简化,For the equipment load, ignore the influence of the change, ignore the electromagnetic unit loop impedance, set the total equivalent load to ZL', and further simplify the model.

计算可得: The calculation is available:

输出电压U随着低压电容C2和其介损ε2的增大而减小,随其高压电容C1和其介损ε1的增大而增大,输出电压U随设备绝缘性能参数变化,即导致计量准确度随设备绝缘性能参数变化。The output voltage U decreases with the increase of the low-voltage capacitor C2 and its dielectric loss ε 2 , and increases with the increase of its high-voltage capacitor C1 and its dielectric loss ε 1 , and the output voltage U varies with the insulation performance parameters of the device. The measurement accuracy varies with the insulation performance parameters of the equipment.

综合以上原理,基于跨专业的大数据共享平台,建立关口计量电容式电压互感器计量准确度远程在线预警系统,以评价预警模块为核心,以采集系统和综合试验管理平台数据为资源,实时监测设备运行工况,分析CVT电容量、介损及相应线损等参量变化趋势,周期性评价设备老化状况,预判CVT准确度变化程度。Based on the above principle, based on the cross-professional big data sharing platform, a remote online early warning system for measuring the measurement accuracy of capacitive voltage transformers is established. The evaluation module is used as the core, and the data of the acquisition system and the comprehensive test management platform are used as resources. Equipment operating conditions, analysis of CVT capacitance, dielectric loss and corresponding line loss and other parameters change trends, periodic evaluation of equipment aging conditions, predicting the degree of CVT accuracy changes.

此外,在一个具体事例中,所述方法还包括:Moreover, in a specific example, the method further includes:

步骤S201,根据预存的准确度判断标准判断电压互感器的计量准确度是否合格。In step S201, it is judged whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard.

步骤S202,若判定电压互感器的计量准确度不合格,发送报警指令至报警装置,所述报警指令用于指示所述报警装置报警。Step S202: If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

如图3所示,为本发明实施例提供的一种电压互感器计量准确度在线评价装置的结构示意图,包括:FIG. 3 is a schematic structural diagram of an online evaluation device for measuring accuracy of a voltage transformer according to an embodiment of the present invention, including:

关口数据获取模块301,用于获取数据采集系统采集的关口数据。The gateway data obtaining module 301 is configured to acquire the gateway data collected by the data collection system.

标准关口数据获取模块302,用于获取综合试验管理平台存储的标准关口数据。The standard gateway data obtaining module 302 is configured to obtain standard gateway data stored by the comprehensive test management platform.

计量准确度确定模块303,用于根据关口数据和标准关口数据确定电压互感器的电容量、介损及相应线损的参量变化趋势,并根据电压互感器的电容量、介损及相应线损的参量变化趋势确定电压互感器的计量准确度。The measurement accuracy determining module 303 is configured to determine, according to the gateway data and the standard gateway data, a change trend of the capacitance, the dielectric loss and the corresponding line loss of the voltage transformer, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer The parametric variation trend determines the measurement accuracy of the voltage transformer.

此外,在一个具体事例中,所述装置还包括:Moreover, in a specific example, the apparatus further includes:

线损率确定模块,用于电压互感器的计量关口与参考点之间线路损耗的线损率表达式为:The line loss rate determination module, the line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=r-f1+f2,其中,r'为采集系统显示线损率,r为线路实际线损率,f1为计量点与电压互感器比差,f2为参考点与电压互感器比差。r'=rf 1 +f 2 , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f 1 is the difference between the metering point and the voltage transformer, and f 2 is the reference point and voltage transformer Comparison.

此外,在一个具体事例中,所述电压互感器包括电容分压单元和电磁单元,所述电容分压单元包括并联的膜纸复合介质或并联的全膜介质。Moreover, in a specific example, the voltage transformer comprises a capacitive voltage dividing unit and an electromagnetic unit, the capacitive voltage dividing unit comprising a parallel film-membrane composite medium or a parallel full-film medium.

此外,在一个具体事例中,所述电压互感器的绝缘结构对计量性能的影响包括内绝缘性能、外绝缘性能以及老化性能。Moreover, in a specific example, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

此外,在一个具体事例中,所述装置还包括:Moreover, in a specific example, the apparatus further includes:

根据预存的准确度判断标准判断电压互感器的计量准确度是否合格。According to the pre-stored accuracy judgment standard, it is judged whether the measurement accuracy of the voltage transformer is qualified.

若判定电压互感器的计量准确度不合格,发送报警指令至报警装置,所述报警指令用于指示所述报警装置报警。If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

具体的,预存的准确度判断标准中记录着准确度的合格值区间,若判定电压互感器的计量准确度不在合格区间内,则判定电压互感器的计量准确度不合格,发送报警指令至报警装置提醒工作人员及时进行处理。报警类型可以为语音报警、振动报警、蜂鸣报警或信息提示报警类型中的一种或多种。Specifically, the pre-existing accuracy judgment standard records the qualified value interval of the accuracy. If it is determined that the measurement accuracy of the voltage transformer is not within the qualified interval, it is determined that the measurement accuracy of the voltage transformer is unqualified, and the alarm command is sent to the alarm. The device reminds the staff to handle it in time. The alarm type may be one or more of a voice alarm, a vibration alarm, a buzzer alarm, or an information prompt alarm type.

在一个具体事例中,建立各台关口CVT独立模型,借助高压试验参数变化情况,计算设备准确度变化程度并给出综合理论误差。基于关口采集系统平台,以CVT对应线路线损数据变化量核验理论误差变化情况,综合判断CVT准确度是否异常,并对异常变化趋势进行预警。几种典型环境因素下CVT物理模型,建立了CVT一次试验参量与二次计量准确度试验参量关系模型。大数据下多表征因子协同分析,广泛深刻挖掘用电信息采集系统与综合试验数据平台大量数据应用,并有机结合综合分析。多通道数据同步采集方法,CVT计量性能在线监测系统需要采集变电站内多个间隔的CVT采样值,实现多个电气量之间的采集数据同步,保证同步延时误差小于10us,保证了数据的同步性、有效性。综合评价方法,在模型与多种评价手段的基础上,开展综合评价,对CVT计量特性做出整体性判断,方法协同,试验参数关联与在线线损分析两种方法共同评价,互为校验,大大提升方法可靠性。建立了CVT高压试验参量与计量准确度试验参量关系模型。跨专业试验数据应用挖掘,充分利用高压试验周期相对短的特点,建立设备一、二次参量关系,以在线综合评价方式弥补计量准确度长试验周期的缺点。线下试验数据与线上实时电量数据相结合,实现相关数据深度应用。达成对CVT计量性能的在线评估,同时实现建立整体电能计量装置的实际状态下运行综合误差测算实现整个计量关口设备(包括电能表、电流电压互感器)的在线状态监测、故障诊断和状态评估,为关口计量的状态检测、智能诊断评估提供了强有力的支撑,相对于当前在线校验方式,本发明投入成本小,在大数据应用的背景下具有更好的发展前景和空间。In a specific case, an independent model of each gate CVT is established. With the change of the high-voltage test parameters, the degree of accuracy of the equipment is calculated and the comprehensive theoretical error is given. Based on the gateway acquisition system platform, the theoretical error of the CVT corresponding line loss data is verified, and the accuracy of the CVT is judged comprehensively, and the abnormal trend is predicted. Based on the CVT physical model under several typical environmental factors, a model relationship between the CVT primary test parameters and the secondary measurement accuracy test parameters was established. Under the big data, the multi-characteristic factor collaborative analysis, extensively explored a large number of data applications of the electricity information collection system and the comprehensive test data platform, and combined organic analysis. Multi-channel data synchronous acquisition method, CVT measurement performance online monitoring system needs to collect multiple intervals of CVT sample values in the substation to achieve synchronization of data acquisition between multiple electrical quantities, to ensure synchronization delay error is less than 10us, to ensure data synchronization Sexuality, effectiveness. Comprehensive evaluation method, based on the model and various evaluation methods, carry out comprehensive evaluation, make overall judgment on CVT measurement characteristics, method synergy, test parameter correlation and online line loss analysis are jointly evaluated, mutual verification , greatly improving the reliability of the method. A model parameter relationship between CVT high pressure test parameters and measurement accuracy was established. Cross-professional test data application mining, making full use of the characteristics of relatively short high-voltage test period, establishing the first-order and second-parameter relationship of equipment, and making up the shortcomings of long-term measurement period by online comprehensive evaluation method. The offline test data is combined with online real-time electricity data to achieve deep application of relevant data. The online evaluation of the CVT measurement performance is achieved, and the integrated error measurement in the actual state of the overall energy metering device is realized to realize the online condition monitoring, fault diagnosis and state evaluation of the entire metering device (including the energy meter, the current voltage transformer). It provides strong support for state detection and intelligent diagnosis and evaluation of gateway measurement. Compared with the current online verification mode, the invention has low input cost and has better development prospect and space in the context of big data application.

应理解,上述实施例中各步骤的序号的大小并不意味着执行顺序的先后,各过程的执行顺序应以其功能和内在逻辑确定,而不应对本发明实施例的实施过程构成任何限定。It should be understood that the size of the sequence of the steps in the above embodiments does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation of the embodiments of the present invention.

图4是本发明实施例提供的电压互感器计量准确度在线评价终端设备的示意图,该实施例的终端设备4包括:处理器40、存储器41以及存储在所述存储器41中并可在所述处理器40上运行的计算机程序42,例如电压互感器计量准确度在线评价程序。所述处理器40执行所述计算机程序42时实现上述各个**方法实施例中的步骤,例如图1所示的步骤101至103。或者,所述处理器40执行所述计算机程序42时实现上述各装置实施例中各模块/单元的功能,例如图3所示模块301至303的功能。4 is a schematic diagram of an online evaluation terminal device for measuring the accuracy of a voltage transformer according to an embodiment of the present invention. The terminal device 4 of the embodiment includes: a processor 40, a memory 41, and a memory 41 stored in the memory 41. A computer program 42 running on processor 40, such as a voltage transformer metering accuracy online evaluation program. The processor 40, when executing the computer program 42, implements the steps in the various method embodiments described above, such as steps 101 through 103 shown in FIG. Alternatively, when the processor 40 executes the computer program 42, the functions of the modules/units in the foregoing device embodiments are implemented, such as the functions of the modules 301 to 303 shown in FIG.

示例性的,所述计算机程序42可以被分割成一个或多个模块/单元,所述一个或者多个模块/单元被存储在所述存储器41中,并由所述处理器40执行,以完成本发明。所述一个或多个模块/单元可以是能够完成特定功能的一系列计算机程序指令段,该指令段用于描述所述计算机程序42在所述电压互感器计量准确度在线评价终端设备4中的执行过程。例如,所述计算机程序42可以被分割成同步模块、汇总模块、获取模块、返回模块(虚拟装置中的模块),各模块具体功能如下:Illustratively, the computer program 42 can be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete this invention. The one or more modules/units may be a series of computer program instruction segments capable of performing a particular function, the instruction segments being used to describe the computer program 42 in the voltage transformer metering accuracy online evaluation terminal device 4 Implementation process. For example, the computer program 42 can be divided into a synchronization module, a summary module, an acquisition module, and a return module (modules in a virtual device), and the specific functions of each module are as follows:

获取数据采集系统采集的关口数据。Obtain the gateway data collected by the data acquisition system.

获取综合试验管理平台存储的标准关口数据。Obtain standard gateway data stored by the comprehensive test management platform.

根据关口数据和标准关口数据确定电压互感器的电容量、介损及相应线损的参量变化趋势,并根据的电容量、介损及相应线损的参量变化趋势确定电压互感器的计量准确度。According to the gateway data and the standard gateway data, the change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer is determined, and the measurement accuracy of the voltage transformer is determined according to the change trend of the capacitance, dielectric loss and corresponding line loss. .

电压互感器的计量关口与参考点之间线路损耗的线损率表达式为:The line loss rate expression for the line loss between the metering gate of the voltage transformer and the reference point is:

r'=r-f1+f2,其中,r'为采集系统显示线损率,r为线路实际线损率,f1为计量点与电压互感器比差,f2为参考点与电压互感器比差。r'=rf 1 +f 2 , where r' is the line loss rate of the acquisition system, r is the actual line loss rate of the line, f 1 is the difference between the metering point and the voltage transformer, and f 2 is the reference point and voltage transformer Comparison.

所述电压互感器包括电容分压单元和电磁单元,所述电容分压单元包括并联的膜纸复合介质或并联的全膜介质。The voltage transformer includes a capacitor voltage dividing unit and an electromagnetic unit, and the capacitor voltage dividing unit includes a parallel film-membrane composite medium or a parallel full-film medium.

所述电压互感器的绝缘结构对计量性能的影响包括内绝缘性能、外绝缘性能以及老化性能。The influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance, and aging performance.

根据预存的准确度判断标准判断电压互感器的计量准确度是否合格。According to the pre-stored accuracy judgment standard, it is judged whether the measurement accuracy of the voltage transformer is qualified.

若判定电压互感器的计量准确度不合格,发送报警指令至报警装置,所述报警指令用于指示所述报警装置报警。If it is determined that the measurement accuracy of the voltage transformer is unsatisfactory, an alarm command is sent to the alarm device, and the alarm command is used to instruct the alarm device to alarm.

所述电压互感器计量准确度在线评价终端设备4可以是桌上型计算机、笔记本、掌上电脑及云端服务器等计算设备。所述电压互感器计量准确度在线评价终端设备可包括,但不仅限于,处理器40、存储器41。本领域技术人员可以理解,图4仅仅是电压互感器计量准确度在线评价终端设备4的示例,并不构成对电压互感器计量准确度在线评价终端设备4的限定,可以包括比图示更多或更少的部件,或者组合某些部件,或者不同的部件,例如所述电压互感器计量准确度在线评价终端设备还可以包括输入输出设备、网络接入设备、总线等。The voltage transformer measurement accuracy online evaluation terminal device 4 may be a computing device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The voltage transformer measurement accuracy online evaluation terminal device may include, but is not limited to, the processor 40 and the memory 41. It can be understood by those skilled in the art that FIG. 4 is only an example of the voltage transformer measurement accuracy online evaluation terminal device 4, and does not constitute a limitation of the voltage transformer measurement accuracy online evaluation terminal device 4, and may include more than the illustration. Or fewer components, or a combination of certain components, or different components, such as the voltage transformer metering accuracy, the online rating terminal device may also include input and output devices, network access devices, buses, and the like.

所称处理器40可以是中央处理单元(Central Processing Unit,CPU),还可以是其他通用处理器、数字信号处理器(Digital Signal Processor,DSP)、专用集成电路(Application Specific Integrated Circuit,ASIC)、现成可编程门阵列(Field-Programmable Gate Array,FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。The processor 40 may be a central processing unit (CPU), or may be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

所述存储器41可以是所述电压互感器计量准确度在线评价终端设备4的内部存储单元,例如电压互感器计量准确度在线评价终端设备4的硬盘或内存。所述存储器41也可以是所述电压互感器计量准确度在线评价终端设备4的外部存储设备,例如所述电压互感器计量准确度在线评价终端设备4上配备的插接式硬盘,智能存储卡(Smart Media Card,SMC),安全数字(Secure Digital,SD)卡,闪存卡(Flash Card)等。进一步地,所述存储器41还可以既包括所述电压互感器计量准确度在线评价终端设备4的内部存储单元也包括外部存储设备。所述存储器41用于存储所述计算机程序以及所述电压互感器计量准确度在线评价终端设备所需的其他程序和数据。所述存储器41还可以用于暂时地存储已经输出或者将要输出的数据。The memory 41 may be an internal storage unit of the voltage transformer measurement accuracy online evaluation terminal device 4, for example, a voltage transformer measurement accuracy online evaluation terminal device 4 hard disk or memory. The memory 41 may also be an external storage device of the voltage transformer measurement accuracy online evaluation terminal device 4, for example, the voltage transformer measurement accuracy online evaluation terminal device 4 is equipped with a plug-in hard disk, a smart memory card (Smart Media Card, SMC), Secure Digital (SD) card, Flash Card, etc. Further, the memory 41 may further include the voltage transformer measurement accuracy, the internal storage unit of the terminal device 4 and the external storage device. The memory 41 is configured to store the computer program and the voltage transformer measurement accuracy to evaluate other programs and data required by the terminal device online. The memory 41 can also be used to temporarily store data that has been output or is about to be output.

所属领域的技术人员可以清楚地了解到,为了描述的方便和简洁,仅以上述各功能单元、模块的划分进行举例说明,实际应用中,可以根据需要而将上述功能分配由不同的功能单元、模块完成,即将所述装置的内部结构划分成不同的功能单元或模块,以完成以上描述的全部或者部分功能。实施例中的各功能单元、模块可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中,上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。另外,各功能单元、模块的具体名称也只是为了便于相互区分,并不用于限制本申请的保护范围。上述系统中单元、模块的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。It will be clearly understood by those skilled in the art that, for convenience and brevity of description, only the division of each functional unit and module described above is exemplified. In practical applications, the above functions may be assigned to different functional units according to needs. The module is completed by dividing the internal structure of the device into different functional units or modules to perform all or part of the functions described above. Each functional unit and module in the embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the integrated unit may be implemented by hardware. Formal implementation can also be implemented in the form of software functional units. In addition, the specific names of the respective functional units and modules are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present application. For the specific working process of the unit and the module in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.

在上述实施例中,对各个实施例的描述都各有侧重,某个实施例中没有详述或记载的部分,可以参见其它实施例的相关描述。In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not detailed or described in the specific embodiments may be referred to the related descriptions of other embodiments.

本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

在本发明所提供的实施例中,应该理解到,所揭露的装置/终端设备和方法,可以通过其它的方式实现。例如,以上所描述的装置/终端设备实施例仅仅是示意性的,例如,所述模块或单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通讯连接可以是通过一些接口,装置或单元的间接耦合或通讯连接,可以是电性,机械或其它的形式。In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the device/terminal device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units. Or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.

所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

所述集成的模块/单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本发明实现上述实施例方法中的全部或部分流程,也可以通过计算机程序来指令相关的硬件来完成,所述的计算机程序可存储于一计算机可读存储介质中,该计算机程序在被处理器执行时,可实现上述各个方法实施例的步骤。其中,所述计算机程序包括计算机程序代码,所述计算机程序代码可以为源代码形式、对象代码形式、可执行文件或某些中间形式等。所述计算机可读介质可以包括:能够携带所述计算机程序代码的任何实体或装置、记录介质、U盘、移动硬盘、磁碟、光盘、计算机存储器、只读存储器(ROM,Read-Only Memory)、随机存取存储器(RAM,Random Access Memory)、电载波信号、电信信号以及软件分发介质等。需要说明的是,所述计算机可读介质包含的内容可以根据司法管辖区内立法和专利实践的要求进行适当的增减,例如在某些司法管辖区,根据立法和专利实践,计算机可读介质不包括是电载波信号和电信信号。The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the present invention implements all or part of the processes in the foregoing embodiments, and may also be completed by a computer program to instruct related hardware. The computer program may be stored in a computer readable storage medium. The steps of the various method embodiments described above may be implemented when the program is executed by the processor. Wherein, the computer program comprises computer program code, which may be in the form of source code, object code form, executable file or some intermediate form. The computer readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM). , random access memory (RAM, Random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. It should be noted that the content contained in the computer readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in a jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, computer readable media It does not include electrical carrier signals and telecommunication signals.

以上所述实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围,均应包含在本发明的保护范围之内。The embodiments described above are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in Within the scope of protection of the present invention.

Claims (10)

1. A voltage transformer metering accuracy online evaluation method is characterized by comprising the following steps:
acquiring gateway data acquired by a data acquisition system;
acquiring standard gateway data stored by a comprehensive test management platform;
and determining the capacitance, the dielectric loss and the parameter variation trend of the corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data, and determining the metering accuracy of the voltage transformer according to the capacitance, the dielectric loss and the parameter variation trend of the corresponding line loss.
2. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, further comprising:
the line loss rate expression of the line loss between the metering gateway of the voltage transformer and the reference point is as follows:
r'=r-f1+f2wherein r' is the line loss rate displayed by the acquisition system, r is the actual line loss rate of the line, f1Is the ratio difference between the measuring point and the voltage transformer, f2Is the ratio difference between the reference point and the voltage transformer.
3. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, wherein the voltage transformer comprises a capacitance voltage division unit and an electromagnetic unit, and the capacitance voltage division unit comprises parallel membrane-paper composite media or parallel full-membrane media.
4. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, wherein the influence of the insulation structure of the voltage transformer on the metering performance comprises inner insulation performance, outer insulation performance and aging performance.
5. The online evaluation method for the metering accuracy of the voltage transformer according to claim 1, further comprising:
judging whether the metering accuracy of the voltage transformer is qualified or not according to a prestored accuracy judgment standard;
and if the metering accuracy of the voltage transformer is judged to be unqualified, sending an alarm instruction to an alarm device, wherein the alarm instruction is used for indicating the alarm device to alarm.
6. The utility model provides a voltage transformer measurement accuracy online evaluation device which characterized in that includes:
the gateway data acquisition module is used for acquiring gateway data acquired by the data acquisition system;
the standard gateway data acquisition module is used for acquiring standard gateway data stored by the comprehensive test management platform;
and the measurement accuracy determining module is used for determining the capacitance, the dielectric loss and the parameter change trend of the corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data, and determining the measurement accuracy of the voltage transformer according to the capacitance, the dielectric loss and the parameter change trend of the corresponding line loss of the voltage transformer.
7. The on-line evaluation device for the metering accuracy of the voltage transformer as recited in claim 6, further comprising:
and the line loss rate determining module is used for expressing the line loss rate of the line loss between the metering gateway of the voltage transformer and the reference point as follows:
r'=r-f1+f2wherein r' is the line loss rate displayed by the acquisition system, r is the actual line loss rate of the line, f1Is the ratio difference between the measuring point and the voltage transformer, f2Is the ratio difference between the reference point and the voltage transformer.
8. The on-line evaluation device for the metering accuracy of the voltage transformer as claimed in claim 6, wherein the voltage transformer comprises a capacitance voltage division unit and an electromagnetic unit, and the capacitance voltage division unit comprises parallel membrane paper composite media or parallel full-membrane media.
9. Terminal equipment for online evaluation of the metering accuracy of a voltage transformer, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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