CN111474454A - A method and device for localization of transformer partial discharge based on wireless ultrasound - Google Patents
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Abstract
本申请公开一种基于无线超声的变压器局部放电定位方法和装置。所述方法包括定位基准坐标器；选取无线超声传感器位置；同步触发基准坐标器和无线超声传感器，选取信号最强的无线超声传感器，定义为第一无线超声传感器；重新选取变压器非散热侧面，选取该非散热侧面信号最强的无线超声传感器，定义为第二无线超声传感器；当第一无线超声传感器与第二无线超声传感器为对立面时，同步触发第一无线超声传感器与第二无线超声传感器，记录信号到达第一无线超声传感器与第二无线超声传感器的时间间隔，基于超声波信号时差定位方法，定位局部放电信号。能够快速的对变压器内部的放电进行定位，提高现场检测人员的检测效率。
The present application discloses a method and device for localizing partial discharge of transformers based on wireless ultrasound. The method includes positioning the reference coordinate device; selecting the position of the wireless ultrasonic sensor; triggering the reference coordinate device and the wireless ultrasonic sensor synchronously, and selecting the wireless ultrasonic sensor with the strongest signal, which is defined as the first wireless ultrasonic sensor; The wireless ultrasonic sensor with the strongest signal on the non-radiating side is defined as the second wireless ultrasonic sensor; when the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposite to each other, the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are triggered synchronously, The time interval between the arrival of the signal to the first wireless ultrasonic sensor and the second wireless ultrasonic sensor is recorded, and the partial discharge signal is located based on the ultrasonic signal time difference location method. It can quickly locate the discharge inside the transformer and improve the detection efficiency of on-site inspection personnel.
Description
技术领域technical field
本申请涉及变压器状态监控技术领域，尤其涉及一种基于无线超声的变压器局部放电定位方法和装置。The present application relates to the technical field of transformer state monitoring, and in particular, to a method and device for localizing partial discharge of transformers based on wireless ultrasound.
背景技术Background technique
电力变压器是电力系统的核心设备，其运行可靠性直接影响着整个系统的安全稳定。而局部放电所导致的变压器绝缘劣化或击穿是产生变压器运行故障的主要原因之一。The power transformer is the core equipment of the power system, and its operational reliability directly affects the safety and stability of the entire system. And transformer insulation deterioration or breakdown caused by partial discharge is one of the main reasons for transformer operation failure.
从现有的变压器局部放电检测技术来看,超声波局部放电检测及定位技术是较为可靠和行之有效的手段，定位变压器局部放电的位置，对于变压器缺陷的性质及严重程度的诊断是十分必要的，针对超声波局部放电检测的缺陷性质及定位的位置，可以相应地制定变压器的现场或返厂检修策略，这对提升变压器安全及经济运行具有重要意义。Judging from the existing transformer partial discharge detection technology, ultrasonic partial discharge detection and positioning technology is a relatively reliable and effective means. It is very necessary to locate the position of transformer partial discharge for the diagnosis of the nature and severity of transformer defects. , according to the defect nature and location of ultrasonic partial discharge detection, the on-site or return to factory maintenance strategy of the transformer can be formulated accordingly, which is of great significance to improve the safety and economic operation of the transformer.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种基于无线超声的变压器局部放电定位方法，该方法能够快速的对变压器内部的放电进行定位，提高现场检测人员的检测效率。The purpose of the present invention is to provide a method for locating partial discharge of a transformer based on wireless ultrasound, which can quickly locate the discharge inside the transformer and improve the detection efficiency of on-site inspection personnel.
为了实现上述目的，本申请提供如下技术方案：一种基于无线超声的变压器局部放电定位方法，包括：In order to achieve the above purpose, the present application provides the following technical solutions: a method for locating partial discharge of transformers based on wireless ultrasound, comprising:
定位基准坐标器；Positioning the reference coordinator;
选取无线超声传感器位置；Select the location of the wireless ultrasonic sensor;
同步触发基准坐标器和无线超声传感器，选取信号最强的无线超声传感器，定义为第一无线超声传感器；Synchronously trigger the reference coordinate device and the wireless ultrasonic sensor, and select the wireless ultrasonic sensor with the strongest signal, which is defined as the first wireless ultrasonic sensor;
重新选取变压器非散热侧面，选取该非散热侧面信号最强的无线超声传感器，定义为第二无线超声传感器；Reselect the non-radiating side of the transformer, and select the wireless ultrasonic sensor with the strongest signal on the non-radiating side, which is defined as the second wireless ultrasonic sensor;
当第一无线超声传感器与第二无线超声传感器为对立面时，同步触发第一无线超声传感器与第二无线超声传感器，记录信号到达第一无线超声传感器与第二无线超声传感器的时间间隔，基于超声波信号时差定位方法，定位局部放电信号。When the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposites, the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are triggered synchronously, and the time interval between the signal reaching the first wireless ultrasonic sensor and the second wireless ultrasonic sensor is recorded, based on the ultrasonic wave Signal time difference positioning method to locate partial discharge signals.
如上所述的基于无线超声的变压器局部放电定位方法，其中，定位基准坐标器具体为：在变压器的四个顶角上布置位置传感器，定义四个位置传感器为基准坐标器，坐标分别为S0(0，0，0)、Si(1，0，0)、Sj(0，0，1)，Sh(0，1，0)。The above-mentioned wireless ultrasonic-based transformer partial discharge positioning method, wherein, the positioning reference coordinate device is specifically: position sensors are arranged on the four top corners of the transformer, and the four position sensors are defined as the reference coordinate device, and the coordinates are S 0 (0, 0, 0), S i (1, 0, 0), S j (0, 0, 1), Sh (0, 1, 0).
如上所述的基于无线超声的变压器局部放电定位方法，其中，选取无线超声传感器位置具体为：按照等间距放置无线超声传感器。In the above-mentioned method for locating partial discharge of transformer based on wireless ultrasound, the selection of the position of the wireless ultrasonic sensor is specifically: placing the wireless ultrasonic sensors at equal intervals.
如上所述的基于无线超声的变压器局部放电定位方法，其中，在变压器侧面上选取离放电位置最近的无线超声传感器，该无线超声传感器与放电点所在的直线垂直于该变压器侧面。In the above-mentioned method for locating partial discharge of transformer based on wireless ultrasound, the wireless ultrasonic sensor closest to the discharge position is selected on the side of the transformer, and the straight line between the wireless ultrasonic sensor and the discharge point is perpendicular to the side of the transformer.
如上所述的基于无线超声的变压器局部放电定位方法，其中，第一无线超声传感器坐标为An′(xn′，yn′，0)、第二无线超声传感器坐标为Am′(0，ym′，zm′)和局部放电位置处于同一平面内，且该平面平行于点S0、Si、Sj所在的平面α，即yn′＝ym′，计算出放电点的位置坐标P(xn′，yn′，zm′)。The above wireless ultrasonic-based transformer partial discharge localization method, wherein the coordinates of the first wireless ultrasonic sensor are A n' (x n' , y n' , 0), and the coordinates of the second wireless ultrasonic sensor are Am' (0 , y m′ , z m′ ) and the partial discharge position are in the same plane, and the plane is parallel to the plane α where the points S 0 , S i , and S j are located, that is, yn ′ =y m′ , the discharge point is calculated The position coordinates P(x n′ , yn ′ , z m′ ).
如上所述的基于无线超声的变压器局部放电定位方法，其中，当选择的第一无线超声传感器An与第二无线超声传感器Am处于对立面时，无线超声传感器An’、Am’和放电位置处在同一直线上，且垂直于变压器两侧面，记录信号到达An’和Am’的时间间隔τ。The above-mentioned wireless ultrasonic-based transformer partial discharge localization method, wherein, when the selected first wireless ultrasonic sensor A n and the second wireless ultrasonic sensor Am are on opposite sides, the wireless ultrasonic sensors A n ', Am ' and discharge The positions are on the same straight line and perpendicular to both sides of the transformer, and the time interval τ when the signal arrives at An ' and A m ' is recorded.
如上所述的基于无线超声的变压器局部放电定位方法，其中，假设局放信号传到An′和Am″的时间分别为t1和t2，则得出：The above-mentioned wireless ultrasound-based transformer partial discharge localization method, wherein, assuming that the time when the partial discharge signal is transmitted to An ' and Am" are t 1 and t 2 respectively, it is obtained:
t1-t2＝τ (1)t 1 -t 2 =τ (1)
假设S0与Sj的距离为L，则得出如下公式：Assuming that the distance between S 0 and S j is L, the following formula is obtained:
c·t1+c·t2＝L (2)c·t 1 +c·t 2 =L (2)
其中c为常数，L为电磁波传播速度；where c is a constant and L is the speed of electromagnetic wave propagation;
由公式(1)和(2)得出：It follows from formulas (1) and (2):
由此P'得出放电位置坐标
本申请还提供一种基于无线超声的变压器局部放电定位装置，所述装置执行上述任一项所述的基于无线超声的变压器局部放电定位方法。The present application further provides a wireless ultrasonic-based transformer partial discharge localization device, which implements the wireless ultrasonic-based transformer partial discharge localization method described in any one of the above.
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中记载的一些实施例，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图。In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.
图1是本申请实施例提供的一种基于无线超声的变压器局部放电定位方法流程图；1 is a flowchart of a method for locating partial discharge in transformers based on wireless ultrasound provided by an embodiment of the present application;
图2是定位基准坐标器坐标示意图；Fig. 2 is the schematic diagram of the coordinates of the positioning reference coordinate device;
图3是无线超声传感器具体位置布置示意图；FIG. 3 is a schematic diagram of the specific location layout of the wireless ultrasonic sensor;
图4是选取信号最强的无线超声传感器具体位置布置示意图；4 is a schematic diagram of the specific location layout of the wireless ultrasonic sensor with the strongest signal selected;
图5是放电位置具体坐标示意图。FIG. 5 is a schematic diagram of the specific coordinates of the discharge position.
具体实施方式Detailed ways
下面结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
实施例一Example 1
本申请实施例一提供一种基于无线超声的变压器局部放电定位方法，如图1所示，包括：Embodiment 1 of the present application provides a method for locating partial discharge in transformers based on wireless ultrasound, as shown in FIG. 1 , including:
步骤110、定位基准坐标器；Step 110, locating the reference coordinate device;
具体地，在变压器的四个顶角上布置位置传感器S0、Si、Sj、Sh，定义四个位置传感器为基准坐标器，坐标分别为S0(0，0，0)、Si(1，0，0)、Sj(0，0，1)，Sh(0，1，0)，具体位置如图2所示。Specifically, position sensors S 0 , S i , S j , and Sh are arranged on the four top corners of the transformer, and the four position sensors are defined as reference coordinates, and the coordinates are S 0 (0, 0, 0), S i (1, 0, 0), S j (0, 0, 1), Sh (0, 1, 0), the specific positions are shown in FIG. 2 .
步骤120、选取无线超声传感器位置；Step 120, select the location of the wireless ultrasonic sensor;
具体地，在变压器非散热侧，按照等间距放置无线超声传感器，传感器坐标分别为A1(x1，y1，0)、A2(x2，y2，0)、A3(x3，y3，0)……，具体位置布置如图3所示。Specifically, on the non-radiating side of the transformer, wireless ultrasonic sensors are placed at equal intervals, and the sensor coordinates are A 1 (x 1 , y 1 , 0), A 2 (x 2 , y 2 , 0), A 3 (x 3 ) , y 3 , 0)..., the specific location arrangement is shown in Figure 3.
步骤130、同步触发基准坐标器和无线超声传感器，选取信号最强的无线超声传感器，定义为第一无线超声传感器；Step 130, trigger the reference coordinate device and the wireless ultrasonic sensor synchronously, select the wireless ultrasonic sensor with the strongest signal, and define it as the first wireless ultrasonic sensor;
具体地，同步触发基准坐标器和无线超声传感器，得到时间同步采集信号，根据无线超声传感器所采集信号的强度大小，选取信号最强的无线超声传感器，在布置无线超声传感器足够密集的情况下，该无线超声传感器与放电点所在的直线垂直于该变压器侧面，且是该侧面离放电位置最近的无线超声传感器，定义该无线超声传感器为An，确定其坐标An(xn，yn，zn)，如图4所示无线超声传感器坐标为An′(xn′，yn′，0)。Specifically, the reference coordinator and the wireless ultrasonic sensor are triggered synchronously to obtain a time-synchronized acquisition signal. According to the strength of the signal collected by the wireless ultrasonic sensor, the wireless ultrasonic sensor with the strongest signal is selected. The line between the wireless ultrasonic sensor and the discharge point is perpendicular to the side of the transformer, and is the wireless ultrasonic sensor whose side is closest to the discharge position. Define the wireless ultrasonic sensor as A n , and determine its coordinates A n (x n , y n , z n ), as shown in FIG. 4 , the coordinates of the wireless ultrasonic sensor are A n′ (x n′ , yn ′ , 0).
步骤140、重新选取变压器非散热侧面，选取该非散热侧面信号最强的无线超声传感器，定义为第二无线超声传感器；Step 140, reselect the non-radiating side of the transformer, select the wireless ultrasonic sensor with the strongest signal on the non-radiating side, and define it as the second wireless ultrasonic sensor;
具体地，重新选取变压器非散热侧面，同步触发基准坐标器和无线超声传感器，得到时间同步采集信号，根据无线超声传感器所采集信号的强度大小，选取信号最强的无线超声传感器，在布置无线超声传感器足够密集的情况下，该无线超声传感器与放电点所在的直线垂直于该变压器侧面，且是该侧面离放电位置最近的无线超声传感器，定义该传感器为Am，确定其坐标Am(xm，ym，zm)，如图5所示无线超声传感器坐标为Am′(0，ym′，zm′)。Specifically, reselect the non-radiating side of the transformer, trigger the reference coordinate device and the wireless ultrasonic sensor synchronously, and obtain the time-synchronized acquisition signal. According to the strength of the signal collected by the wireless ultrasonic sensor, select the wireless ultrasonic sensor with the strongest signal, and arrange the wireless ultrasonic When the sensors are dense enough, the line between the wireless ultrasonic sensor and the discharge point is perpendicular to the side of the transformer, and is the wireless ultrasonic sensor that is closest to the discharge position on the side. Define the sensor as Am , and determine its coordinates Am (x m , y m , z m ), as shown in FIG. 5 , the coordinates of the wireless ultrasonic sensor are Am′ (0, y m′ , z m′ ).
由于无线超声传感器An′和Am′分别与放电位置所组成的直线均垂直于本侧变压器侧面，根据几何原理，传感器An′、Am′和局部放电位置处于同一平面内，且该平面平行于点S0、Si、Sj所在的平面α，即yn′＝ym′，如图4所示。由此，可以计算出放电点的位置坐标P(xn′，yn′，zm′)。Since the straight lines formed by the wireless ultrasonic sensors An ' and Am' and the discharge position respectively are perpendicular to the side of the transformer on this side, according to the geometric principle, the sensors An ' , Am' and the partial discharge position are in the same plane, and the The plane is parallel to the plane α where the points S 0 , S i , and S j are located, that is, y n′ =y m′ , as shown in FIG. 4 . Thereby, the position coordinates P(x n' , yn ' , z m' ) of the discharge point can be calculated.
步骤150、当第一无线超声传感器与第二无线超声传感器为对立面时，同步触发第一无线超声传感器与第二无线超声传感器，记录信号到达第一无线超声传感器与第二无线超声传感器的时间间隔，基于超声波信号时差定位方法，定位局部放电信号；Step 150: When the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposites, trigger the first wireless ultrasonic sensor and the second wireless ultrasonic sensor synchronously, and record the time interval when the signal reaches the first wireless ultrasonic sensor and the second wireless ultrasonic sensor , based on the ultrasonic signal time difference positioning method to locate the partial discharge signal;
具体地，如图5所示，当选择的第一无线超声传感器An与第二无线超声传感器Am处于对立面时，无线超声传感器An′和Am″和放电位置处在同一直线上，且垂直于变压器两侧面，同步触发无线超声传感器An′和Am″，记录信号到达An′和Am″的时间间隔τ。Specifically, as shown in FIG. 5 , when the selected first wireless ultrasonic sensor An and the second wireless ultrasonic sensor Am are on opposite sides, the wireless ultrasonic sensors An ' and Am" and the discharge position are on the same straight line, And perpendicular to both sides of the transformer, the wireless ultrasonic sensors An ' and Am" are triggered synchronously, and the time interval τ when the signal reaches An ' and Am" is recorded.
假设局放信号传到An′和Am″的时间分别为t1和t2，则得出：Assuming that the time for the PD signal to reach An ' and Am" is t 1 and t 2 respectively, we can get:
t1-t2＝τ (1)t 1 -t 2 =τ (1)
假设S0与Sj的距离为L，可以得出如下公式：Assuming that the distance between S 0 and S j is L, the following formula can be obtained:
c·t1+c·t2＝L (2)c·t 1 +c·t 2 =L (2)
其中c为常数，电磁波传播速度。where c is a constant, the speed of electromagnetic wave propagation.
由公式(1)和(2)得出：It follows from formulas (1) and (2):
由此可以P'得出放电位置坐标
以上所述实施例，仅为本申请的具体实施方式，用以说明本申请的技术方案，而非对其限制，本申请的保护范围并不局限于此，尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，其依然可以对前述实施例所记载的技术方案进行修改或可轻易想到变化，或者对其中部分技术特征进行等同替换；而这些修改、变化或者替换，并不使相应技术方案的本质脱离本申请实施例技术方案的精神和范围。都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。The above-mentioned embodiments are only specific implementations of the present application, and are used to illustrate the technical solutions of the present application, but not to limit them. Detailed description, those of ordinary skill in the art should understand: any person skilled in the art is within the technical scope disclosed in this application, and it can still modify the technical solutions described in the foregoing embodiments or can easily think of changes, Or equivalently replace some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application. All should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
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| CN202010495967.7A CN111474454B (en) | 2020-06-03 | 2020-06-03 | Transformer partial discharge positioning method and device based on wireless ultrasound |
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