CN111751777A - A method for diagnosing the running state of a voltage transformer - Google Patents

A method for diagnosing the running state of a voltage transformer Download PDF

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CN111751777A
CN111751777A CN202010601134.4A CN202010601134A CN111751777A CN 111751777 A CN111751777 A CN 111751777A CN 202010601134 A CN202010601134 A CN 202010601134A CN 111751777 A CN111751777 A CN 111751777A
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phase
voltage
phases
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transformer
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CN111751777B (en
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谷斌
江晨玲
代尚林
梁嘉俊
刘华烨
郭乐欣
黄潇恺
樊新启
赖天德
王世祥
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Shenzhen Power Supply Bureau 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

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Abstract

本发明涉及一种电压互感器运行状态诊断方法及其系统,所述方法包括:周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;根据所述采样数据计算A相、B相和C相的电压平均值;根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。本发明能够防止实际运行过程中,出现停电检查时电压互感器电气性能正常,运行中却发生故障的情况,避免影响电力设备安全稳定运行及电气工作人员安全。

Figure 202010601134

The invention relates to a method and a system for diagnosing the running state of a voltage transformer. The method comprises: periodically sampling the secondary voltage output by the voltage transformer to obtain sampled data; The voltage average value of B-phase and C-phase; calculate the voltage difference between each two phases according to the voltage average value of A-phase, B-phase and C-phase; according to the A-phase, B-phase and C-phase voltage average value and the voltage difference between each two phases to calculate the voltage deviation between each two phases; according to the comparison result of the voltage deviation between each two phases and the preset deviation threshold, and the preset judgment logic to determine the voltage Whether the transformer is faulty. The invention can prevent the situation that the electrical performance of the voltage transformer is normal during the power failure inspection, but the fault occurs during the operation during the actual operation process, and avoids affecting the safe and stable operation of the power equipment and the safety of electrical workers.

Figure 202010601134

Description

一种电压互感器运行状态诊断方法A method for diagnosing the running state of a voltage transformer

技术领域technical field

本发明涉及电压互感器技术领域,具体涉及一种电压互感器运行状态诊断方法。The invention relates to the technical field of voltage transformers, in particular to a method for diagnosing the running state of a voltage transformer.

背景技术Background technique

电力系统为了能远距离、大功率传输电能,需要采用高电压进行输送,输送电能的电压等级在10kV、110kV、220kV、500kV甚至是1000kV。上述电压等级远高于人体安全电压36V,也高于居民日常用电的220V。传输高电压等级的电力设备需要进行实时状态监测、电能计量等监测和控制,就需要将高电压转换成低电压。电压互感器的作用是把高电压按比例关系变换成100V或更低等级的标准二次电压,供保护、计量、仪表装置取用,如此就可以对高电压等级设备进行监测、控制和保护。同时,使用电压互感器可以将高电压与电气工作人员隔离,保障人员人身安全。电压互感器输出二次电压不准确将导致以下问题:1、电能计量错误,造成经济损失和纠纷;2、电力系统调控错误,致使电力设备运行在高于额定电压下工作或低于额定电压下工作,造成电力设备损坏或效率低;3、继电保护设备误动作,导致用户停电,或者继电保护设备拒动作导致电力设备故障后无法及时切除隔离,而造成电力设备损坏。因此,电压互感器运行状态的好坏将直接影响电力设备安全稳定运行及电气工作人员安全。In order to transmit electrical energy over long distances and with high power, the power system needs to use high voltage for transmission. The above-mentioned voltage level is much higher than the human safety voltage of 36V, and also higher than the 220V of the daily electricity consumption of residents. Power equipment that transmits high voltage levels needs to perform monitoring and control such as real-time status monitoring, energy metering, etc., and it is necessary to convert high voltage into low voltage. The function of the voltage transformer is to convert the high voltage proportionally into a standard secondary voltage of 100V or lower for use by protection, metering, and instrumentation devices, so that high-voltage equipment can be monitored, controlled and protected. At the same time, the use of voltage transformers can isolate high voltages from electrical workers to ensure personal safety. Inaccurate secondary voltage output from the voltage transformer will lead to the following problems: 1. Errors in electric energy measurement, resulting in economic losses and disputes; 2. Errors in power system regulation, resulting in power equipment operating at higher than rated voltage or lower than rated voltage 3. The relay protection equipment malfunctions, causing the user to lose power, or the relay protection equipment refuses to operate, resulting in the failure of the power equipment to be removed and isolated in time, resulting in damage to the power equipment. Therefore, the operating state of the voltage transformer will directly affect the safe and stable operation of power equipment and the safety of electrical workers.

目前,电压互感器运行状态检测主要是按照检修规程定期停电检查,且检查周期在3年以上。《电力设备检修试验规程》Q/CSG1206007-2017对电容式电压互感器检修试验规定:110kV及以下的每6年进行一次检测、110kV以上的每3年进行一次检测,且规定每节电容值偏差不超出额定值的-5%—+10%,只有当电容测量值与出厂值或上次测量值偏差2%以上时才进行精度测量。At present, the detection of voltage transformer operating status is mainly based on regular power outage inspections in accordance with maintenance procedures, and the inspection period is more than 3 years. "Power Equipment Maintenance Test Regulations" Q/CSG1206007-2017 stipulates the maintenance test of capacitive voltage transformers: 110kV and below shall be tested every 6 years, and 110kV and above shall be tested every 3 years, and the deviation of the capacitance value of each section shall be specified. It does not exceed -5%—+10% of the rated value. Only when the capacitance measurement value deviates from the factory value or the last measurement value by more than 2%, can the accuracy be measured.

在实现本发明的过程中,发明人发现目前电压互感器停电检查存在以下问题:In the process of realizing the present invention, the inventor found that the current voltage transformer power failure inspection has the following problems:

虽然在停电检查中能发现部分电压互感器故障及隐患。但是,电压互感器故障的发展呈现指数特征,即故障的发展不是线性发展的,而是刚开始发展缓慢,当故障积累到一定程度后,电压互感器电气绝缘、电磁传输超过临界点后将直接恶化而不能再正常运行。电压互感器在故障初期因电气性能变化不大,即使停电进行检查也无法发现问题,但在下一个检查周期前可能已经恶化。同时,为了考虑停电检查时试验误差,检查标准均有一定容错裕度,而此裕度通常大于电压互感器初期故障电气性能误差。也就是说,现有定期停电检查的手段和方法不能够及时发现电压互感器故障。实际运行过程中,出现了很多停电检查时电压互感器电气性能正常,运行中发生故障情况。Although some voltage transformer faults and hidden dangers can be found in the power outage inspection. However, the development of voltage transformer faults presents exponential characteristics, that is, the development of faults is not linear, but develops slowly at the beginning. When the fault accumulates to a certain extent, the electrical insulation and electromagnetic transmission of the voltage transformer will directly deteriorated and can no longer function properly. In the early stage of failure, the electrical performance of the voltage transformer does not change much. Even if the power is cut off, the problem cannot be found, but it may have deteriorated before the next inspection cycle. At the same time, in order to consider the test error during the power failure inspection, the inspection standards have a certain fault tolerance margin, and this margin is usually larger than the electrical performance error of the initial fault of the voltage transformer. That is to say, the existing means and methods for regular power failure inspection cannot detect the fault of the voltage transformer in time. In the actual operation process, there are many situations where the electrical performance of the voltage transformer is normal during the power outage inspection, and the fault occurs during operation.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于提出一种电压互感器运行状态诊断方法,以解决目前电压互感器停电检查的上述技术问题。The purpose of the present invention is to propose a method for diagnosing the running state of a voltage transformer, so as to solve the above-mentioned technical problem of the current power failure inspection of the voltage transformer.

为实现上述目的,本发明实施例提出一种电压互感器运行状态诊断方法,包括:To achieve the above purpose, an embodiment of the present invention proposes a method for diagnosing the operating state of a voltage transformer, including:

周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;Periodically sample the secondary voltage output by the voltage transformer to obtain sampled data;

根据所述采样数据计算A相、B相和C相的电压平均值;Calculate the average voltage of the A-phase, B-phase and C-phase according to the sampled data;

根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;Calculate the voltage difference between each two phases according to the voltage average value of the A-phase, B-phase and C-phase;

根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;Calculate the voltage deviation between each of the two phases according to the voltage average value of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases;

根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。Whether the voltage transformer is faulty is determined according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic.

优选地,所述采样数据为日采样数据、周采样数据、月采样数据中的一种。Preferably, the sampling data is one of daily sampling data, weekly sampling data, and monthly sampling data.

优选地,所述根据所述采样数据计算A相、B相和C相的电压平均值,具体包括:Preferably, the calculating the average voltage of the A-phase, B-phase and C-phase according to the sampled data specifically includes:

根据日采样数据计算A相、B相和C相的日电压平均值;Calculate the daily average voltage of A-phase, B-phase and C-phase according to the daily sampling data;

或者,根据周采样数据计算A相、B相和C相的周电压平均值;Or, calculate the average value of the weekly voltage of phase A, phase B and phase C according to the weekly sampling data;

或者,根据月采样数据计算A相、B相和C相的月电压平均值。Alternatively, calculate the monthly average voltages of Phase A, Phase B, and Phase C based on monthly sampling data.

优选地,所述根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值,具体包括:Preferably, the calculating the voltage difference between each two phases according to the average value of the voltages of the A-phase, B-phase and C-phase, specifically includes:

根据所述A相、B相和C相的日电压平均值、周电压平均值或月电压平均值计算每两相之间的电压差值。The voltage difference between each two phases is calculated according to the daily voltage average, the weekly voltage average or the monthly voltage average value of the A-phase, B-phase and C-phase.

优选地,所述根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差,具体包括:Preferably, the calculating the voltage deviation between each two phases according to the average voltage of the A-phase, B-phase and C-phase and the voltage difference between the two phases, specifically includes:

Figure BDA0002559011540000031
Figure BDA0002559011540000031

Figure BDA0002559011540000032
Figure BDA0002559011540000032

Figure BDA0002559011540000033
Figure BDA0002559011540000033

其中,UA为A相的电压平均值,UB为B相的电压平均值,UC为C相的电压平均值,ΔUAB为A、B相之间的电压差,ΔUBC为B、C相之间的电压差,ΔUCA为C、A相之间的电压差,

Figure BDA0002559011540000034
为A、B相之间的电压偏差,
Figure BDA0002559011540000035
为B、C相之间的电压偏差,
Figure BDA0002559011540000036
为C、A相之间的电压偏差。Among them, U A is the average voltage of phase A, U B is the average voltage of phase B, U C is the average voltage of phase C, Δ U AB is the voltage difference between phases A and B, and Δ U BC is The voltage difference between B and C phases, Δ U CA is the voltage difference between C and A phases,
Figure BDA0002559011540000034
is the voltage deviation between phases A and B,
Figure BDA0002559011540000035
is the voltage deviation between phases B and C,
Figure BDA0002559011540000036
is the voltage deviation between phases C and A.

优选地,所述根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障,具体包括:Preferably, determining whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic specifically includes:

如果仅有

Figure BDA0002559011540000041
则A、B两相异常,C相正常;if only
Figure BDA0002559011540000041
Then the A and B phases are abnormal, and the C phase is normal;

如果仅有

Figure BDA0002559011540000042
则B、C两相异常,A相正常;if only
Figure BDA0002559011540000042
Then phase B and C are abnormal, and phase A is normal;

如果仅有

Figure BDA0002559011540000043
则A、C两相异常,B相正常;if only
Figure BDA0002559011540000043
Then phase A and C are abnormal, and phase B is normal;

如果

Figure BDA0002559011540000044
Figure BDA0002559011540000045
则A相异常,B、C相正常;if
Figure BDA0002559011540000044
and
Figure BDA0002559011540000045
Phase A is abnormal, and phases B and C are normal;

如果

Figure BDA0002559011540000046
Figure BDA0002559011540000047
则B相异常,A、C相正常;if
Figure BDA0002559011540000046
and
Figure BDA0002559011540000047
Phase B is abnormal, and phases A and C are normal;

如果

Figure BDA0002559011540000048
Figure BDA0002559011540000049
则C相异常,A、B相正常;if
Figure BDA0002559011540000048
and
Figure BDA0002559011540000049
The C phase is abnormal, and the A and B phases are normal;

如果

Figure BDA00025590115400000410
Figure BDA00025590115400000411
则A、B、C三相异常。if
Figure BDA00025590115400000410
and
Figure BDA00025590115400000411
Then the three phases of A, B, and C are abnormal.

优选地,所述根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障,具体包括:Preferably, determining whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic specifically includes:

如果连续多个周期,仅有

Figure BDA00025590115400000412
则A、B两相异常,C相正常;If there are multiple consecutive cycles, only
Figure BDA00025590115400000412
Then the A and B phases are abnormal, and the C phase is normal;

如果连续多个周期,仅有

Figure BDA00025590115400000413
则B、C两相异常,A相正常;If there are multiple consecutive cycles, only
Figure BDA00025590115400000413
Then phase B and C are abnormal, and phase A is normal;

如果连续多个周期,仅有

Figure BDA00025590115400000414
则A、C两相异常,B相正常;If there are multiple consecutive cycles, only
Figure BDA00025590115400000414
Then phase A and C are abnormal, and phase B is normal;

如果连续多个周期,

Figure BDA00025590115400000415
Figure BDA00025590115400000416
则A相异常,B、C相正常;If there are multiple consecutive cycles,
Figure BDA00025590115400000415
and
Figure BDA00025590115400000416
Phase A is abnormal, and phases B and C are normal;

如果连续多个周期,

Figure BDA00025590115400000417
Figure BDA00025590115400000418
则B相异常,A、C相正常;If there are multiple consecutive cycles,
Figure BDA00025590115400000417
and
Figure BDA00025590115400000418
Phase B is abnormal, and phases A and C are normal;

如果连续多个周期,

Figure BDA00025590115400000419
Figure BDA00025590115400000420
则C相异常,A、B相正常;If there are multiple consecutive cycles,
Figure BDA00025590115400000419
and
Figure BDA00025590115400000420
The C phase is abnormal, and the A and B phases are normal;

如果连续多个周期,

Figure BDA00025590115400000421
Figure BDA00025590115400000422
则A、B、C三相异常。If there are multiple consecutive cycles,
Figure BDA00025590115400000421
and
Figure BDA00025590115400000422
Then the three phases of A, B, and C are abnormal.

优选地,所述方法还包括:Preferably, the method further includes:

如果根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器故障,则输出与故障类型对应的告警信息,并存储所述告警信息。If it is determined that the voltage transformer is faulty according to the comparison result between the voltage deviation between each two phases and the preset deviation threshold and the preset decision logic, alarm information corresponding to the fault type is output, and the alarm information is stored.

第二方面,本发明实施例提出一种电压互感器运行状态诊断系统,用于实现上述实施例的方法,包括:In a second aspect, an embodiment of the present invention provides a system for diagnosing an operating state of a voltage transformer, which is used to implement the method of the foregoing embodiment, including:

采样单元,用于周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;The sampling unit is used to periodically sample the secondary voltage output by the voltage transformer to obtain sampling data;

平均值计算单元,用于根据所述采样数据计算A相、B相和C相的电压平均值;an average value calculation unit, used for calculating the voltage average value of A-phase, B-phase and C-phase according to the sampled data;

电压差值计算单元,用于根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;a voltage difference calculation unit, configured to calculate the voltage difference between each two phases according to the average voltage of the A-phase, B-phase and C-phase;

电压偏差计算单元,用于根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;以及a voltage deviation calculation unit, configured to calculate the voltage deviation between every two phases according to the voltage average value of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases; and

故障判定单元,用于根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。The fault determination unit is configured to determine whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic.

优选地,所述系统还包括:Preferably, the system further includes:

告警单元,用于如果所述故障判定单元根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器故障,则输出与故障类型对应的告警信息,并存储所述告警信息。an alarm unit, configured to output an alarm corresponding to the fault type if the fault determination unit determines that the voltage transformer is faulty according to the comparison result of the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic information, and store the alarm information.

以上实施例方案具有如下有益效果:The above embodiment scheme has the following beneficial effects:

通过周期性地对电压互感器输出的二次电压进行采样,以获得采样数据,可以是日采样数据、周采样数据或者月采样数据,并根据所述采样数据计算每两相之间的电压偏差,最终根据所述每两相之间的电压偏差与一预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。其中,电压互感器输出的二次电压的采样可以在不停电的情况下进行,实现采样并根据采样数据进行电压互感器的运行状态诊断,防止实际运行过程中,出现停电检查时电压互感器电气性能正常,运行中却发生故障的情况,避免影响电力设备安全稳定运行及电气工作人员安全。By periodically sampling the secondary voltage output by the voltage transformer to obtain sampling data, which can be daily sampling data, weekly sampling data or monthly sampling data, and calculating the voltage deviation between each two phases according to the sampling data , and finally determine whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and a preset deviation threshold value and the preset judgment logic. Among them, the sampling of the secondary voltage output by the voltage transformer can be carried out without power failure, so as to realize the sampling and carry out the operation status diagnosis of the voltage transformer according to the sampled data, so as to prevent the voltage transformer electrical failure during the power failure inspection during the actual operation. The performance is normal, but the failure occurs during operation, so as to avoid affecting the safe and stable operation of power equipment and the safety of electrical workers.

本发明的其它特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本发明而得以体现。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。Other features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or will be manifested by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

附图说明Description of drawings

为了更清楚地说明本发明实施例或现有技术中的技术方案,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的前提下,还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

图1为本发明一实施例中一种电压互感器运行状态诊断方法的流程图。FIG. 1 is a flowchart of a method for diagnosing an operating state of a voltage transformer according to an embodiment of the present invention.

图2为本发明一实施例中电容式电压互感器结构原理图。FIG. 2 is a schematic structural diagram of a capacitive voltage transformer in an embodiment of the present invention.

图3为本发明一实施例中一种电压互感器运行状态诊断系统的框架图。FIG. 3 is a frame diagram of a system for diagnosing an operating state of a voltage transformer according to an embodiment of the present invention.

具体实施方式Detailed ways

以下将参考附图详细说明本发明的各种示例性实施例、特征和方面。附图中相同的附图标记表示功能相同或相似的元件。尽管在附图中示出了实施例的各种方面,但是除非特别指出,不必按比例绘制附图。Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures denote elements that have the same or similar functions. While various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

另外,为了更好的说明本发明,在下文的具体实施例中给出了众多的具体细节。本领域技术人员应当理解,没有某些具体细节,本发明同样可以实施。在一些实例中,对于本领域技术人员熟知的手段未作详细描述,以便于凸显本发明的主旨。In addition, in order to better illustrate the present invention, numerous specific details are given in the following specific embodiments. It will be understood by those skilled in the art that the present invention may be practiced without certain specific details. In some instances, means well known to those skilled in the art have not been described in detail in order not to obscure the subject matter of the present invention.

如图1所示,本发明一实施例提出一种电压互感器运行状态诊断方法,包括:As shown in FIG. 1 , an embodiment of the present invention provides a method for diagnosing an operating state of a voltage transformer, including:

步骤S1、周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;Step S1, periodically sampling the secondary voltage output by the voltage transformer to obtain sampling data;

步骤S2、根据所述采样数据计算A相、B相和C相的电压平均值;Step S2, calculate the voltage average value of A-phase, B-phase and C-phase according to the sampling data;

步骤S3、根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;Step S3, calculating the voltage difference between each two phases according to the voltage average value of the A-phase, B-phase and C-phase;

步骤S4、根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;Step S4, calculating the voltage deviation between each two phases according to the voltage average value of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases;

步骤S5、根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。Step S5: Determine whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic.

具体而言,电容式电压互感器(CVT)是由串联电容器分压,再经电磁式互感器降压和隔离,作为表计、继电保护等的一种电压互感器。电容式电压互感器与电磁式电压互感器相比,除可防止因电压互感器铁芯饱和引起铁磁谐振外,还具有冲击绝缘强度高、制造简单、重量轻、体积小、成本低、运行可靠、维护方便并可兼做高频载波通信的耦合电容等优点。主要缺点是其误差特性比电磁式电压互感器差,且输出容量较小,影响误差的因素较多(如温度、频率等)。目前我国制造的TYD型电容式电压互感器准确度已提高到0.5级,在110kV及以上中性点直接接地系统中得到了广泛的应用。Specifically, the capacitive voltage transformer (CVT) is divided by a series capacitor, and then stepped down and isolated by an electromagnetic transformer, as a voltage transformer for meters, relay protection, etc. Compared with the electromagnetic voltage transformer, the capacitive voltage transformer can not only prevent the ferromagnetic resonance caused by the saturation of the iron core of the voltage transformer, but also has the advantages of high impact dielectric strength, simple manufacture, light weight, small size, low cost and operation. It is reliable, easy to maintain and can also be used as a coupling capacitor for high-frequency carrier communication. The main disadvantage is that its error characteristics are worse than that of electromagnetic voltage transformers, and the output capacity is small, and there are many factors that affect the error (such as temperature, frequency, etc.). At present, the accuracy of TYD-type capacitive voltage transformers manufactured in my country has been improved to 0.5 level, and it has been widely used in 110kV and above neutral point direct grounding systems.

电容式电压互感器主要由电容分压器和中间变压器组成。电容分压器由瓷套和装在其中的若干串联电容器组成,瓷套内充满绝缘油。中压变压器由装在密封油箱内的变压器、补偿电抗器、避雷器和阻尼装置组成。电容式电压互感器本质上是一个电容分压器,为了便于分析,将电容器串分成主电容C1和分压电容C2两部分(也叫上电容C1、下电容C2),每一个部分都是由若干个电容器串联组成,如图2所示。T为中间变压器,L为补偿电抗器,BL为并联在补偿电抗器两端的保护用避雷器。中间变压器T和补偿电抗器L都设有抽头,分别用来调节电容式电压互感器的幅值误差和相位误差。1a、1n为第一组二次绕组,主要用于测量;2a、2n为第二组二次绕组,主要用于保护;da、dn为第三组二次绕组,和另外两相的第三组二次绕组串接,用于测量零序电压。第三绕组两端还并接了一个由电抗和电阻组成的速饱和阻尼器Z,这主要是因为电容式电压互感器的非线性阻抗和固有的电容有时会在电容式电压互感器内引起铁磁谐振,因而用阻尼装置抑制谐振。正常情况下阻尼装置有很高的阻抗,当铁磁谐振引起过电压,在中间变压器受到影响前,电抗器已经饱和了只剩电阻负载,使振荡能量很快被降低。Capacitive voltage transformers are mainly composed of capacitive voltage dividers and intermediate transformers. The capacitor voltage divider is composed of a porcelain sleeve and several series capacitors installed in it, and the porcelain sleeve is filled with insulating oil. The medium voltage transformer consists of a transformer, a compensation reactor, a surge arrester and a damping device installed in a sealed oil tank. Capacitive voltage transformer is essentially a capacitive voltage divider. In order to facilitate analysis, the capacitor string is divided into two parts: main capacitor C1 and voltage divider capacitor C2 (also called upper capacitor C1 and lower capacitor C2). Several capacitors are connected in series, as shown in Figure 2. T is the intermediate transformer, L is the compensating reactor, and BL is the protective arrester connected in parallel at both ends of the compensating reactor. Both the intermediate transformer T and the compensation reactor L are provided with taps, which are respectively used to adjust the amplitude error and phase error of the capacitive voltage transformer. 1a, 1n are the first set of secondary windings, mainly used for measurement; 2a, 2n are the second set of secondary windings, mainly used for protection; da, dn are the third set of secondary windings, and the third set of the other two phases The secondary windings are connected in series to measure the zero-sequence voltage. A fast saturation damper Z composed of reactance and resistance is also connected in parallel at both ends of the third winding. This is mainly because the nonlinear impedance and inherent capacitance of the capacitive voltage transformer sometimes cause iron in the capacitive voltage transformer. Magnetic resonance, thus damping the resonance with a damping device. Under normal circumstances, the damping device has a high impedance. When the ferromagnetic resonance causes overvoltage, before the intermediate transformer is affected, the reactor has been saturated and only the resistance load is left, so that the oscillation energy is quickly reduced.

假设电容式电压互感器上端电压为U,中间变压器一次侧电压为U’,则:Assuming that the voltage at the upper end of the capacitive voltage transformer is U, and the voltage at the primary side of the intermediate transformer is U', then:

U’=U×C1/(C1+C2)U’=U×C1/(C1+C2)

式中,K=C1/(C1+C2)为分压比,改变C1和C2的比值,可得到不同的分压比。当部分C1损坏时,C1将变大,中间变压器一次侧电压将升高;当部分C2损坏时,C2将变大,中间变压器一次侧电压将降低。因而对应的二次侧电压也将跟随着改变,且变化大小与C1、C2密切相关。In the formula, K=C1/(C1+C2) is the voltage division ratio. By changing the ratio of C1 and C2, different voltage division ratios can be obtained. When part of C1 is damaged, C1 will become larger and the voltage on the primary side of the intermediate transformer will increase; when part of C2 is damaged, C2 will become larger and the voltage on the primary side of the intermediate transformer will decrease. Therefore, the corresponding secondary side voltage will also change, and the magnitude of the change is closely related to C1 and C2.

通过上述对电容式电压互感器原理分析,可以知道当电容式电压互感器的上下级电容发生击穿故障、中间变压器故障及二次回路故障,均能影响其输出二次电压。电压互感器的功能就是将一次电压转换成合格的二次电压。因而,本申请通过监测二次侧电压来判断电压互感器的运行状态,判断其是否存在故障。Through the above analysis of the principle of the capacitive voltage transformer, it can be known that when the upper and lower capacitors of the capacitive voltage transformer have breakdown faults, intermediate transformer faults and secondary circuit faults, they can all affect the output secondary voltage. The function of the voltage transformer is to convert the primary voltage into a qualified secondary voltage. Therefore, the present application judges the operation state of the voltage transformer by monitoring the voltage on the secondary side, and judges whether there is a fault.

其中,所述采样数据为日采样数据、周采样数据、月采样数据或年采样数据中的一种。The sampling data is one of daily sampling data, weekly sampling data, monthly sampling data or annual sampling data.

具体而言,电压互感器二次电压还随一次系统电压变化,且一次系统电压变化还存在一定随机性。因此,监测二次侧电压所选取的参考标准就不能是电压互感器额定电压。同时,一次系统负荷随着时间变化也是波动的,因而不能简单地选取历史值作为参考标准。由于电力系统都是三相同时运行,且三相电压互感器基本上是同一厂家、同时投运的。因而,三相电压互感器其正常衰减周期亦是一致的。一次系统负荷虽然一直在波动,但在较长的时间内三相是大致均衡的。所以,本申请选取同一母线或间隔的三相电压互感器的日历史曲线、周历史曲线、月历史曲线或年历史曲线来进行电压互感器运行状态判决依据。Specifically, the secondary voltage of the voltage transformer also changes with the voltage of the primary system, and the change of the voltage of the primary system also has a certain randomness. Therefore, the reference standard selected for monitoring the secondary side voltage cannot be the rated voltage of the voltage transformer. At the same time, the primary system load also fluctuates with time, so the historical value cannot be simply selected as the reference standard. Because the power systems are all three-phase running at the same time, and the three-phase voltage transformers are basically the same manufacturer and put into operation at the same time. Therefore, the normal decay period of the three-phase voltage transformer is also the same. Although the load of the primary system fluctuates all the time, the three phases are roughly balanced for a long time. Therefore, the present application selects the daily history curve, weekly history curve, monthly history curve or year history curve of the three-phase voltage transformers of the same bus or interval as the basis for judging the operating state of the voltage transformers.

在步骤S1中,设定一个采样周期,例如每5分钟采集一个二次电压值,三相电压分别为UA1、UB1、UC1,下一个采样周期时三相电压分别为UA2、UB2、UC2,以此类推,将所有采样值送入存储器存储起来。每天三相电压的二次电压值就是当日所有电压的平均值,即:In step S1, a sampling period is set, for example, a secondary voltage value is collected every 5 minutes, the three-phase voltages are U A1 , U B1 , and U C1 respectively, and the three-phase voltages in the next sampling period are U A2 , U respectively B2 , U C2 , and so on, send all the sampled values to the memory for storage. The secondary voltage value of the three-phase voltage every day is the average value of all the voltages on that day, namely:

Figure BDA0002559011540000091
Figure BDA0002559011540000091

Figure BDA0002559011540000092
Figure BDA0002559011540000092

Figure BDA0002559011540000093
Figure BDA0002559011540000093

式中,UAt、UBt、UCt,分别是三相电压每相当日电压平均值,代表当日电压值。用平均值代替瞬时采样值可以减少采样误差及电力系统电压波动等因素对二次电压影响。UAi、UBi、UCi代表三相电压当日各采样时间点的瞬时采样值,即某一时刻三相电压瞬时值。n为当日总共的电压采样点数,该值可以通过预设的采样周期进行计算得出,例如采样周期为1个小时,则n=24。In the formula, U At , U Bt , and U Ct , respectively, are the average voltage of the three-phase voltage per equivalent day, representing the voltage value of the day. Replacing the instantaneous sampling value with the average value can reduce the influence of factors such as sampling error and power system voltage fluctuation on the secondary voltage. U Ai , U Bi , and U Ci represent the instantaneous sampling values of the three-phase voltage at each sampling time point of the day, that is, the instantaneous value of the three-phase voltage at a certain moment. n is the total number of voltage sampling points on the day, and the value can be calculated by the preset sampling period. For example, if the sampling period is 1 hour, n=24.

其中,所述步骤S2具体包括:Wherein, the step S2 specifically includes:

根据日采样数据计算A相、B相和C相的日电压平均值;Calculate the daily average voltage of A-phase, B-phase and C-phase according to the daily sampling data;

或者,根据周采样数据计算A相、B相和C相的周电压平均值;Or, calculate the average value of the weekly voltage of phase A, phase B and phase C according to the weekly sampling data;

或者,根据月采样数据计算A相、B相和C相的月电压平均值。Alternatively, calculate the monthly average voltages of Phase A, Phase B, and Phase C based on monthly sampling data.

具体而言,按照上述步骤计算出每日的三相电压值,然后再用每日电压值计算出每周电压值,每周电压值计算方法同每日电压值,均是当周内各相电压各自求平均值,即:Specifically, calculate the daily three-phase voltage value according to the above steps, and then use the daily voltage value to calculate the weekly voltage value. The calculation method of the weekly voltage value is the same as the daily voltage value. The voltages are averaged individually, namely:

Figure BDA0002559011540000101
Figure BDA0002559011540000101

Figure BDA0002559011540000102
Figure BDA0002559011540000102

Figure BDA0002559011540000103
Figure BDA0002559011540000103

式中,UAz、UBz、UCz,分别是三相电压每相当周电压平均值,代表当周电压值。用平均值代替瞬时采样值可以减少采样误差及电力系统电压波动等因素对二次电压影响。UAti、UBti、UCti代表三相电压当日电压平均值。n为当周总共的电压采样点数,该值n=7。In the formula, U Az , U Bz , U Cz , respectively, are the average value of the three-phase voltage per equivalent cycle voltage, representing the current cycle voltage value. Replacing the instantaneous sampling value with the average value can reduce the influence of factors such as sampling error and power system voltage fluctuation on the secondary voltage. U Ati , U Bti , U Cti represent the average voltage of the three-phase voltage on that day. n is the total number of voltage sampling points in the current week, the value n=7.

按照上述步骤,以此类推,可以得出三相电压各月、各年度电压值。According to the above steps, and so on, the monthly and annual voltage values of the three-phase voltage can be obtained.

其中,所述步骤S3具体包括:Wherein, the step S3 specifically includes:

根据所述A相、B相和C相的日电压平均值、周电压平均值或月电压平均值计算每两相之间的电压差值。The voltage difference between each two phases is calculated according to the daily voltage average, the weekly voltage average or the monthly voltage average value of the A-phase, B-phase and C-phase.

具体而言,通过上述采样及计算方法得出三相电压的日电压值、周电压值、月电压值、年电压值,接下来就需要对电压值进行进一步计算,计算各相电压之间的电压差值。即:Specifically, the daily voltage value, weekly voltage value, monthly voltage value, and annual voltage value of the three-phase voltage are obtained through the above sampling and calculation methods. voltage difference. which is:

ΔUAB=UA-UB ΔU AB =U A -U B

ΔUBC=UB-UC ΔU BC =U B -U C

ΔUCA=UC-UA ΔU CA =U C -U A

当采用不同电压时,可以计算出不同的电压差值,如当采用日电压值时可计算出日电压差值、采用周电压值时可计算出周电压差值。When different voltages are used, different voltage differences can be calculated. For example, when daily voltage values are used, daily voltage differences can be calculated, and weekly voltage differences can be calculated when weekly voltage values are used.

其中,所述步骤S4具体包括:Wherein, the step S4 specifically includes:

Figure BDA0002559011540000111
Figure BDA0002559011540000111

Figure BDA0002559011540000112
Figure BDA0002559011540000112

Figure BDA0002559011540000113
Figure BDA0002559011540000113

其中,UA为A相的电压平均值,UB为B相的电压平均值,UC为C相的电压平均值,ΔUAB为A、B相之间的电压差,ΔUBC为B、C相之间的电压差,ΔUCA为C、A相之间的电压差,

Figure BDA0002559011540000114
为A、B相之间的电压偏差,
Figure BDA0002559011540000115
为B、C相之间的电压偏差,
Figure BDA0002559011540000116
为C、A相之间的电压偏差。Among them, U A is the average voltage of phase A, U B is the average voltage of phase B, U C is the average voltage of phase C, Δ U AB is the voltage difference between phases A and B, and Δ U BC is The voltage difference between B and C phases, Δ U CA is the voltage difference between C and A phases,
Figure BDA0002559011540000114
is the voltage deviation between phases A and B,
Figure BDA0002559011540000115
is the voltage deviation between phases B and C,
Figure BDA0002559011540000116
is the voltage deviation between phases C and A.

其中,在一实施例中,所述步骤S5具体包括:Wherein, in one embodiment, the step S5 specifically includes:

如果仅有

Figure BDA0002559011540000117
则A、B两相异常,C相正常;if only
Figure BDA0002559011540000117
Then the A and B phases are abnormal, and the C phase is normal;

如果仅有

Figure BDA0002559011540000118
则B、C两相异常,A相正常;if only
Figure BDA0002559011540000118
Then phase B and C are abnormal, and phase A is normal;

如果仅有

Figure BDA0002559011540000121
则A、C两相异常,B相正常;if only
Figure BDA0002559011540000121
Then phase A and C are abnormal, and phase B is normal;

如果

Figure BDA0002559011540000122
Figure BDA0002559011540000123
则A相异常,B、C相正常;if
Figure BDA0002559011540000122
and
Figure BDA0002559011540000123
Phase A is abnormal, and phases B and C are normal;

如果

Figure BDA0002559011540000124
Figure BDA0002559011540000125
则B相异常,A、C相正常;if
Figure BDA0002559011540000124
and
Figure BDA0002559011540000125
Phase B is abnormal, and phases A and C are normal;

如果

Figure BDA0002559011540000126
Figure BDA0002559011540000127
则C相异常,A、B相正常;if
Figure BDA0002559011540000126
and
Figure BDA0002559011540000127
The C phase is abnormal, and the A and B phases are normal;

如果

Figure BDA0002559011540000128
Figure BDA0002559011540000129
则A、B、C三相异常。if
Figure BDA0002559011540000128
and
Figure BDA0002559011540000129
Then the three phases of A, B, and C are abnormal.

具体而言,将计算得到的各相电压偏差与给定的电压偏差标准进行比较,当计算的电压偏差大于给定的电压偏差标准即判断电压互感器二次电压存在异常,即

Figure BDA00025590115400001210
Figure BDA00025590115400001211
时判断出电压互感器二次电压存在异常。其中
Figure BDA00025590115400001212
为给定的电压偏差标准,该值随计算不同时间长度、不同电压等级的二次电压时不一样。例如在计算500kV电压互感器周电压偏差时
Figure BDA00025590115400001213
而计算500kV电压互感器月电压偏差时
Figure BDA00025590115400001214
Specifically, the calculated voltage deviation of each phase is compared with the given voltage deviation standard. When the calculated voltage deviation is greater than the given voltage deviation standard, it is judged that the secondary voltage of the voltage transformer is abnormal, that is,
Figure BDA00025590115400001210
or
Figure BDA00025590115400001211
When it is judged that the secondary voltage of the voltage transformer is abnormal. in
Figure BDA00025590115400001212
For a given voltage deviation standard, this value is different when calculating the secondary voltage of different time lengths and different voltage levels. For example, when calculating the cycle voltage deviation of a 500kV voltage transformer
Figure BDA00025590115400001213
When calculating the monthly voltage deviation of 500kV voltage transformer
Figure BDA00025590115400001214

可以理解的是,当三个电压偏差中,只有一个电压偏差大于电压偏差标准时,则判断为该电压偏差所涉及的两相电压互感器异常,即当只有

Figure BDA00025590115400001215
则判断为A、B两相电压互感器异常。当三个电压偏差中,有两个电压偏差大于电压偏差标准时,则上述两个电压偏差所共同涉及相的电压互感器异常,即当只有
Figure BDA00025590115400001216
则判断为B两相电压互感器异常。It can be understood that when only one of the three voltage deviations is greater than the voltage deviation standard, it is judged that the two-phase voltage transformer involved in the voltage deviation is abnormal, that is, when only
Figure BDA00025590115400001215
Then it is judged that the two-phase voltage transformers of A and B are abnormal. When two of the three voltage deviations are greater than the voltage deviation standard, the voltage transformers of the phases commonly involved in the above two voltage deviations are abnormal, that is, when only
Figure BDA00025590115400001216
Then it is judged that the two-phase voltage transformer of B is abnormal.

其中,在另一实施例中,所述步骤S5具体包括:Wherein, in another embodiment, the step S5 specifically includes:

如果连续多个周期,仅有

Figure BDA00025590115400001217
则A、B两相异常,C相正常;If there are multiple consecutive cycles, only
Figure BDA00025590115400001217
Then the A and B phases are abnormal, and the C phase is normal;

如果连续多个周期,仅有

Figure BDA00025590115400001218
则B、C两相异常,A相正常;If there are multiple consecutive cycles, only
Figure BDA00025590115400001218
Then phase B and C are abnormal, and phase A is normal;

如果连续多个周期,仅有

Figure BDA00025590115400001219
则A、C两相异常,B相正常;If there are multiple consecutive cycles, only
Figure BDA00025590115400001219
Then phase A and C are abnormal, and phase B is normal;

如果连续多个周期,

Figure BDA00025590115400001220
Figure BDA00025590115400001221
则A相异常,B、C相正常;If there are multiple consecutive cycles,
Figure BDA00025590115400001220
and
Figure BDA00025590115400001221
Phase A is abnormal, and phases B and C are normal;

如果连续多个周期,

Figure BDA0002559011540000131
Figure BDA0002559011540000132
则B相异常,A、C相正常;If there are multiple consecutive cycles,
Figure BDA0002559011540000131
and
Figure BDA0002559011540000132
Phase B is abnormal, and phases A and C are normal;

如果连续多个周期,

Figure BDA0002559011540000133
Figure BDA0002559011540000136
则C相异常,A、B相正常;If there are multiple consecutive cycles,
Figure BDA0002559011540000133
and
Figure BDA0002559011540000136
The C phase is abnormal, and the A and B phases are normal;

如果连续多个周期,

Figure BDA0002559011540000134
Figure BDA0002559011540000135
则A、B、C三相异常。If there are multiple consecutive cycles,
Figure BDA0002559011540000134
and
Figure BDA0002559011540000135
Then the three phases of A, B, and C are abnormal.

具体而言,本实施例中为了消除偶然因素干扰,导致出现误判情况出现,可以使用连续多个周期的电压偏差比较来判断,也就是可以设定为连续3周的某一周电压偏差超过电压偏差标准、连续2个月的某一月电压偏差超过电压偏差标准,则确定故障。Specifically, in this embodiment, in order to eliminate the interference of accidental factors, resulting in the occurrence of misjudgment, the voltage deviation comparison of multiple consecutive cycles can be used to judge, that is, the voltage deviation can be set to exceed the voltage in a certain cycle of 3 consecutive cycles. The deviation standard, the voltage deviation of a certain month for 2 consecutive months exceeds the voltage deviation standard, and the fault is determined.

在一具体实施例中,所述方法还包括:In a specific embodiment, the method further includes:

如果根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器故障,则输出与故障类型对应的告警信息,并存储所述告警信息。If it is determined that the voltage transformer is faulty according to the comparison result between the voltage deviation between each two phases and the preset deviation threshold and the preset decision logic, alarm information corresponding to the fault type is output, and the alarm information is stored.

可以理解的是,在以上实施例中,由于当前电压互感器检测手段及检测周期限制,电压互感器存在异常甚至故障时不能及时发现,而电压互感器作为电力系统中非常重要电气设备,其健康安全稳定运行关系着电力系统及电气设备能否正常运行,通过实时监测电压互感器二次输出电压,计算不同周期的电压差及电压偏差,即可在电压互感器存在异常情况下及时发现,提醒电气运维人员及时处理,避免出现大的电力事故。It can be understood that, in the above embodiment, due to the current detection methods and detection cycle limitations of voltage transformers, abnormality or even failure of voltage transformers cannot be found in time, and voltage transformers are very important electrical equipment in the power system. Safe and stable operation is related to the normal operation of the power system and electrical equipment. By monitoring the secondary output voltage of the voltage transformer in real time, and calculating the voltage difference and voltage deviation in different periods, the abnormality of the voltage transformer can be detected in time and reminded. Electrical operation and maintenance personnel deal with it in time to avoid major power accidents.

通过以上实施例的描述可知,本发明具有以下优点:As can be seen from the description of the above embodiments, the present invention has the following advantages:

(1)本方法可以根据电压互感器二次输出电压进行电压互感器运行状态判别,可以实时监测,在电压互感器出现异常后第一时间发现并告警。(1) The method can discriminate the operating state of the voltage transformer according to the secondary output voltage of the voltage transformer, can monitor in real time, and detect and give an alarm immediately after the abnormality of the voltage transformer occurs.

(2)本方法可以广泛应用于加装了三相电压互感器的各种情况。(2) This method can be widely used in various situations where three-phase voltage transformers are installed.

(3)本方法在解决上电压互感器异常、故障发现不计算问题时,不需要变电站设备停电,大大降低整改难度,也减少了整改成本。(3) This method does not require power outage of substation equipment when solving the problem of abnormal upper voltage transformers and failure to calculate when faults are found, which greatly reduces the difficulty of rectification and reduces the cost of rectification.

如图3所示,本发明实施例提出一种电压互感器运行状态诊断系统,用于实现上述实施例的方法,包括:As shown in FIG. 3 , an embodiment of the present invention provides a system for diagnosing an operating state of a voltage transformer, which is used to implement the method of the foregoing embodiment, including:

采样单元1,用于周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;The sampling unit 1 is used for periodically sampling the secondary voltage output by the voltage transformer to obtain sampling data;

平均值计算单元2,用于根据所述采样数据计算A相、B相和C相的电压平均值;an average value calculation unit 2, configured to calculate the voltage average value of A-phase, B-phase and C-phase according to the sampled data;

电压差值计算单元3,用于根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;a voltage difference calculation unit 3, configured to calculate the voltage difference between each two phases according to the voltage average value of the A-phase, B-phase and C-phase;

电压偏差计算单元4,用于根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;以及a voltage deviation calculation unit 4, configured to calculate the voltage deviation between every two phases according to the voltage average value of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases; and

故障判定单元5,用于根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。The fault determination unit 5 is configured to determine whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic.

在一具体实施例中,所述系统还包括:In a specific embodiment, the system further includes:

告警单元6,用于如果所述故障判定单元5根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器故障,则告警单元6输出与故障类型对应的告警信息,并存储所述告警信息。The alarm unit 6 is used for if the fault determination unit 5 determines that the voltage transformer is faulty according to the comparison result of the voltage deviation between the two phases and the preset deviation threshold and the preset determination logic, the alarm unit 6 outputs and The alarm information corresponding to the fault type is stored, and the alarm information is stored.

以上所描述的系统实施例仅仅是示意性的,其中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模块来实现本实施例方案的目的。The system embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

需说明的是,上述实施例所述系统与上述实施例所述方法对应,因此,上述实施例所述系统未详述部分可以参阅上述实施例所述方法的内容得到,此处不再赘述。It should be noted that the system described in the foregoing embodiment corresponds to the method described in the foregoing embodiment. Therefore, the undescribed part of the system described in the foregoing embodiment can be obtained by referring to the content of the method described in the foregoing embodiment, which will not be repeated here.

并且,上述实施例所述车位线识别系统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。Moreover, if the parking space line identification system described in the above embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

具体而言,所述计算机可读存储介质可以包括: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-OnlyMemory)、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。Specifically, the computer-readable storage 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, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

以上已经描述了本发明的各实施例,上述说明是示例性的,并非穷尽性的,并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下,对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择,旨在最好地解释各实施例的原理、实际应用或对市场中的技术改进,或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。Various embodiments of the present invention have been described above, and the foregoing descriptions are exemplary, not exhaustive, and not limiting of the disclosed embodiments. Numerous modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen to best explain the principles of the embodiments, the practical application or technical improvement in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1.一种电压互感器运行状态诊断方法,其特征在于,包括:1. A method for diagnosing the operating state of a voltage transformer, comprising: 周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;Periodically sample the secondary voltage output by the voltage transformer to obtain sampled data; 根据所述采样数据计算A相、B相和C相的电压平均值;Calculate the average voltage of the A-phase, B-phase and C-phase according to the sampled data; 根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;Calculate the voltage difference between each two phases according to the voltage average value of the A-phase, B-phase and C-phase; 根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;Calculate the voltage deviation between each of the two phases according to the voltage average value of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases; 根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。Whether the voltage transformer is faulty is determined according to the comparison result of the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic. 2.如权利要求1所述的电压互感器运行状态诊断方法,其特征在于,所述采样数据为日采样数据、周采样数据、月采样数据中的一种。2 . The method for diagnosing the operating state of a voltage transformer according to claim 1 , wherein the sampling data is one of daily sampling data, weekly sampling data, and monthly sampling data. 3 . 3.如权利要求2所述的电压互感器运行状态诊断方法,其特征在于,所述根据所述采样数据计算A相、B相和C相的电压平均值,具体包括:3. The method for diagnosing the operating state of a voltage transformer according to claim 2, wherein the calculating the average voltage of the A-phase, the B-phase and the C-phase according to the sampled data specifically comprises: 根据日采样数据计算A相、B相和C相的日电压平均值;Calculate the daily average voltage of A-phase, B-phase and C-phase according to the daily sampling data; 或者,根据周采样数据计算A相、B相和C相的周电压平均值;Or, calculate the average value of the weekly voltage of phase A, phase B and phase C according to the weekly sampling data; 或者,根据月采样数据计算A相、B相和C相的月电压平均值。Alternatively, calculate the monthly average voltages of Phase A, Phase B, and Phase C based on monthly sampling data. 4.如权利要求3所述的电压互感器运行状态诊断方法,其特征在于,所述根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值,具体包括:4. The method for diagnosing the operating state of a voltage transformer according to claim 3, wherein the voltage difference between each two phases is calculated according to the average value of the voltages of the A-phase, B-phase and C-phase, and the specific include: 根据所述A相、B相和C相的日电压平均值、周电压平均值或月电压平均值计算每两相之间的电压差值。The voltage difference between each two phases is calculated according to the daily voltage average, the weekly voltage average or the monthly voltage average value of the A-phase, B-phase and C-phase. 5.如权利要求4所述的电压互感器运行状态诊断方法,其特征在于,所述根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差,具体包括:5 . The method for diagnosing the operating state of a voltage transformer according to claim 4 , wherein the method is based on the average value of the voltages of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases. 6 . Calculate the voltage deviation between each two phases, including:
Figure FDA0002559011530000021
Figure FDA0002559011530000021
Figure FDA0002559011530000022
Figure FDA0002559011530000022
Figure FDA0002559011530000023
Figure FDA0002559011530000023
其中,UA为A相的电压平均值,UB为B相的电压平均值,UC为C相的电压平均值,ΔUAB为A、B相之间的电压差,ΔUBC为B、C相之间的电压差,ΔUCA为C、A相之间的电压差,
Figure FDA0002559011530000024
为A、B相之间的电压偏差,
Figure FDA0002559011530000025
为B、C相之间的电压偏差,
Figure FDA0002559011530000026
为C、A相之间的电压偏差。
Among them, U A is the average voltage of phase A, U B is the average voltage of phase B, U C is the average voltage of phase C, ΔU AB is the voltage difference between phases A and B, and ΔU BC is the average voltage of phase B, The voltage difference between phases C, ΔU CA is the voltage difference between phases C and A,
Figure FDA0002559011530000024
is the voltage deviation between phases A and B,
Figure FDA0002559011530000025
is the voltage deviation between phases B and C,
Figure FDA0002559011530000026
is the voltage deviation between phases C and A.
6.如权利要求5所述的电压互感器运行状态诊断方法,其特征在于,所述根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障,具体包括:6 . The method for diagnosing the operating state of a voltage transformer according to claim 5 , wherein the voltage is determined according to a comparison result between the voltage deviation between each two phases and a preset deviation threshold, and a preset judgment logic. 7 . Whether the transformer is faulty, including: 如果仅有
Figure FDA0002559011530000027
则A、B两相异常,C相正常;
if only
Figure FDA0002559011530000027
Then the A and B phases are abnormal, and the C phase is normal;
如果仅有
Figure FDA0002559011530000028
则B、C两相异常,A相正常;
if only
Figure FDA0002559011530000028
Then phase B and C are abnormal, and phase A is normal;
如果仅有
Figure FDA0002559011530000029
则A、C两相异常,B相正常;
if only
Figure FDA0002559011530000029
Then phase A and C are abnormal, and phase B is normal;
如果
Figure FDA00025590115300000210
Figure FDA00025590115300000211
则A相异常,B、C相正常;
if
Figure FDA00025590115300000210
and
Figure FDA00025590115300000211
Phase A is abnormal, and phases B and C are normal;
如果
Figure FDA00025590115300000212
Figure FDA00025590115300000213
则B相异常,A、C相正常;
if
Figure FDA00025590115300000212
and
Figure FDA00025590115300000213
Phase B is abnormal, and phases A and C are normal;
如果
Figure FDA00025590115300000214
Figure FDA00025590115300000215
则C相异常,A、B相正常;
if
Figure FDA00025590115300000214
and
Figure FDA00025590115300000215
The C phase is abnormal, and the A and B phases are normal;
如果
Figure FDA00025590115300000216
Figure FDA00025590115300000217
则A、B、C三相异常。
if
Figure FDA00025590115300000216
and
Figure FDA00025590115300000217
Then the three phases of A, B, and C are abnormal.
7.如权利要求6所述的电压互感器运行状态诊断方法,其特征在于,所述根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障,具体包括:7 . The method for diagnosing the operating state of a voltage transformer according to claim 6 , wherein the voltage is determined according to a comparison result between the voltage deviation between each two phases and a preset deviation threshold, and a preset judgment logic. 8 . Whether the transformer is faulty, including: 如果连续多个周期,仅有
Figure FDA0002559011530000031
则A、B两相异常,C相正常;
If there are multiple consecutive cycles, only
Figure FDA0002559011530000031
Then the A and B phases are abnormal, and the C phase is normal;
如果连续多个周期,仅有
Figure FDA0002559011530000032
则B、C两相异常,A相正常;
If there are multiple consecutive cycles, only
Figure FDA0002559011530000032
Then phase B and C are abnormal, and phase A is normal;
如果连续多个周期,仅有
Figure FDA0002559011530000033
则A、C两相异常,B相正常;
If there are multiple consecutive cycles, only
Figure FDA0002559011530000033
Then phase A and C are abnormal, and phase B is normal;
如果连续多个周期,
Figure FDA0002559011530000034
Figure FDA0002559011530000035
则A相异常,B、C相正常;
If there are multiple consecutive cycles,
Figure FDA0002559011530000034
and
Figure FDA0002559011530000035
Phase A is abnormal, and phases B and C are normal;
如果连续多个周期,
Figure FDA0002559011530000036
Figure FDA0002559011530000037
则B相异常,A、C相正常;
If there are multiple consecutive cycles,
Figure FDA0002559011530000036
and
Figure FDA0002559011530000037
Phase B is abnormal, and phases A and C are normal;
如果连续多个周期,
Figure FDA0002559011530000038
Figure FDA0002559011530000039
则C相异常,A、B相正常;
If there are multiple consecutive cycles,
Figure FDA0002559011530000038
and
Figure FDA0002559011530000039
The C phase is abnormal, and the A and B phases are normal;
如果连续多个周期,
Figure FDA00025590115300000310
Figure FDA00025590115300000311
则A、B、C三相异常。
If there are multiple consecutive cycles,
Figure FDA00025590115300000310
and
Figure FDA00025590115300000311
Then the three phases of A, B, and C are abnormal.
8.如权利要求5所述的电压互感器运行状态诊断方法,其特征在于,所述方法还包括:8. The method for diagnosing the operating state of a voltage transformer according to claim 5, wherein the method further comprises: 如果根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器故障,则输出与故障类型对应的告警信息,并存储所述告警信息。If it is determined that the voltage transformer is faulty according to the comparison result between the voltage deviation between each two phases and the preset deviation threshold and the preset decision logic, alarm information corresponding to the fault type is output, and the alarm information is stored. 9.一种电压互感器运行状态诊断系统,用于实现权利要求1-7任一项所述的方法,其特征在于,包括:9. A system for diagnosing the operating state of a voltage transformer, for implementing the method according to any one of claims 1-7, characterized in that, comprising: 采样单元,用于周期性地对电压互感器输出的二次电压进行采样,以获得采样数据;The sampling unit is used to periodically sample the secondary voltage output by the voltage transformer to obtain sampling data; 平均值计算单元,用于根据所述采样数据计算A相、B相和C相的电压平均值;an average value calculation unit, used for calculating the voltage average value of A-phase, B-phase and C-phase according to the sampled data; 电压差值计算单元,用于根据所述A相、B相和C相的电压平均值计算每两相之间的电压差值;a voltage difference calculation unit, configured to calculate the voltage difference between each two phases according to the average voltage of the A-phase, B-phase and C-phase; 电压偏差计算单元,用于根据所述A相、B相和C相的电压平均值以及所述每两相之间的电压差值计算每两相之间的电压偏差;以及a voltage deviation calculation unit, configured to calculate the voltage deviation between every two phases according to the voltage average value of the A-phase, the B-phase and the C-phase and the voltage difference between the two phases; and 故障判定单元,用于根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器是否故障。The fault determination unit is configured to determine whether the voltage transformer is faulty according to the comparison result between the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic. 10.如权利要求9所述的一种电压互感器运行状态诊断系统,其特征在于,所述系统还包括:10. The system for diagnosing the operating state of a voltage transformer according to claim 9, wherein the system further comprises: 告警单元,用于如果所述故障判定单元根据所述每两相之间的电压偏差与预设偏差阈值的比较结果、以及预设判定逻辑判定电压互感器故障,则输出与故障类型对应的告警信息,并存储所述告警信息。an alarm unit, configured to output an alarm corresponding to the fault type if the fault determination unit determines that the voltage transformer is faulty according to the comparison result of the voltage deviation between the two phases and the preset deviation threshold value and the preset judgment logic information, and store the alarm information.
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