CN111474454A - Transformer partial discharge positioning method and device based on wireless ultrasound - Google Patents
Transformer partial discharge positioning method and device based on wireless ultrasound Download PDFInfo
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- CN111474454A CN111474454A CN202010495967.7A CN202010495967A CN111474454A CN 111474454 A CN111474454 A CN 111474454A CN 202010495967 A CN202010495967 A CN 202010495967A CN 111474454 A CN111474454 A CN 111474454A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
The application discloses a transformer partial discharge positioning method and device based on wireless ultrasound. The method comprises positioning a reference coordinator; selecting the position of a wireless ultrasonic sensor; synchronously triggering the reference coordinate device and the wireless ultrasonic sensor, selecting the wireless ultrasonic sensor with the strongest signal, and defining the wireless ultrasonic sensor as a first wireless ultrasonic sensor; reselecting the non-heat-dissipation side face of the transformer, selecting the wireless ultrasonic sensor with the strongest signal of the non-heat-dissipation side face, and defining the wireless ultrasonic sensor as a second wireless ultrasonic sensor; when the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposite, the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are synchronously triggered, the time interval of the signals reaching the first wireless ultrasonic sensor and the second wireless ultrasonic sensor is recorded, and the partial discharge signals are positioned based on an ultrasonic signal time difference positioning method. Discharge to the inside transformer that can be quick is fixed a position, improves on-the-spot measurement personnel's detection efficiency.
Description
Technical Field
The application relates to the technical field of transformer state monitoring, in particular to a transformer partial discharge positioning method and device based on wireless ultrasound.
Background
The power transformer is the core equipment of the power system, and the operational reliability of the power transformer directly affects the safety and stability of the whole system. The insulation deterioration or breakdown of the transformer caused by the partial discharge is one of the main causes of the operation failure of the transformer.
From the existing transformer partial discharge detection technology, the ultrasonic partial discharge detection and positioning technology is a reliable and effective means, the position of the transformer partial discharge is positioned, diagnosis of the nature and the severity of the transformer defect is necessary, and the field or factory returning maintenance strategy of the transformer can be correspondingly formulated according to the nature and the positioned position of the defect detected by the ultrasonic partial discharge, so that the method has important significance for improving the safety and the economic operation of the transformer.
Disclosure of Invention
The invention aims to provide a transformer partial discharge positioning method based on wireless ultrasound, which can be used for quickly positioning discharge in a transformer and improving the detection efficiency of field detection personnel.
In order to achieve the above purpose, the present application provides the following technical solutions: a transformer partial discharge positioning method based on wireless ultrasound comprises the following steps:
positioning a reference coordinator;
selecting the position of a wireless ultrasonic sensor;
synchronously triggering the reference coordinate device and the wireless ultrasonic sensor, selecting the wireless ultrasonic sensor with the strongest signal, and defining the wireless ultrasonic sensor as a first wireless ultrasonic sensor;
reselecting the non-heat-dissipation side face of the transformer, selecting the wireless ultrasonic sensor with the strongest signal of the non-heat-dissipation side face, and defining the wireless ultrasonic sensor as a second wireless ultrasonic sensor;
when the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposite, the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are synchronously triggered, the time interval of the signals reaching the first wireless ultrasonic sensor and the second wireless ultrasonic sensor is recorded, and the partial discharge signals are positioned based on an ultrasonic signal time difference positioning method.
Wireless ultrasound based as described aboveThe partial discharge positioning method of the transformer comprises the following steps of: arranging position sensors on four vertex angles of the transformer, defining the four position sensors as reference coordinators with coordinates S0(0，0，0)、Si(1，0，0)、Sj(0，0，1)，Sh(0，1，0)。
The transformer partial discharge positioning method based on wireless ultrasound comprises the following specific steps of: the wireless ultrasonic sensors are placed at equal intervals.
The method for positioning partial discharge of the transformer based on wireless ultrasound comprises the steps of selecting a wireless ultrasonic sensor closest to a discharge position on the side surface of the transformer, wherein a straight line where the wireless ultrasonic sensor and a discharge point are located is perpendicular to the side surface of the transformer.
The method for positioning partial discharge of transformer based on wireless ultrasound comprises the following steps that a first wireless ultrasonic sensor coordinate is An′(xn′，yn′0) and the second wireless ultrasonic sensor has the coordinate of Am′(0，ym′，zm′) In the same plane as the location of the partial discharge, and parallel to the point S0、Si、SjPlane α in which y is locatedn′＝ym′Calculating the position coordinate P (x) of the discharge pointn′，yn′，zm′)。
The method for positioning partial discharge of transformer based on wireless ultrasound comprises selecting the first wireless ultrasound sensor AnWith a second wireless ultrasonic sensor AmWhen in the opposite surface, the wireless ultrasonic sensor An’、Am' the position of the recording signal reaches An' and AmTime interval of.
The method for positioning partial discharge of transformer based on wireless ultrasound is as above, wherein it is assumed that the partial discharge signal is transmitted to An′And Am″Respectively at times t1And t2Then, it is obtained:
t1-t2＝τ (1)
suppose S0And SjL, the following equation is obtained:
c·t1+c·t2＝L (2)
where c is a constant, L is the electromagnetic wave propagation velocity;
the following equations (1) and (2) yield:
from this P' the discharge position coordinates are derived
The application also provides a transformer partial discharge positioning device based on wireless ultrasound, and the device executes any one of the transformer partial discharge positioning methods based on wireless ultrasound.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a flowchart of a method for positioning partial discharge of a transformer based on wireless ultrasound according to an embodiment of the present application;
FIG. 2 is a schematic view of a positioning reference coordinate system;
FIG. 3 is a schematic diagram of a wireless ultrasound sensor apparatus position arrangement;
FIG. 4 is a schematic diagram of the specific location arrangement of the wireless ultrasonic sensor with the strongest signal;
fig. 5 is a schematic diagram of specific coordinates of the discharge position.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
An embodiment of the present application provides a transformer partial discharge positioning method based on wireless ultrasound, as shown in fig. 1, including:
step 110, positioning a reference coordinate device;
specifically, position sensors S are arranged on four top corners of the transformer0、Si、Sj、ShDefining four position sensors as reference coordinators with coordinates S0(0，0，0)、Si(1，0，0)、Sj(0，0，1)，Sh(0, 1, 0), the specific positions are shown in FIG. 2.
Step 120, selecting the position of the wireless ultrasonic sensor;
specifically, on the non-heat-dissipation side of the transformer, wireless ultrasonic sensors are arranged at equal intervals, and the coordinates of the sensors are A respectively1(x1，y1，0)、A2(x2，y2，0)、A3(x3，y30), … …, the specific positional arrangement is as shown in FIG. 3.
Step 130, synchronously triggering the reference coordinate device and the wireless ultrasonic sensor, selecting the wireless ultrasonic sensor with the strongest signal, and defining the wireless ultrasonic sensor as a first wireless ultrasonic sensor;
specifically, a reference coordinate device and a wireless ultrasonic sensor are triggered synchronously to obtain time synchronous acquisition signals, the wireless ultrasonic sensor with the strongest signal is selected according to the intensity of the signals acquired by the wireless ultrasonic sensor, under the condition that the wireless ultrasonic sensors are arranged densely enough, the straight line of the wireless ultrasonic sensor and a discharge point is perpendicular to the side face of the transformer, the side face of the wireless ultrasonic sensor is the wireless ultrasonic sensor closest to the discharge position, and the wireless ultrasonic sensor is definedIs AnDetermining its coordinates An(xn，yn，zn) The coordinate of the wireless ultrasonic sensor is A as shown in FIG. 4n′(xn′，yn′，0)。
Step 140, reselecting the non-heat-dissipation side face of the transformer, selecting the wireless ultrasonic sensor with the strongest signal of the non-heat-dissipation side face, and defining the wireless ultrasonic sensor as a second wireless ultrasonic sensor;
specifically, a non-heat-dissipation side face of the transformer is reselected, a reference coordinate device and a wireless ultrasonic sensor are synchronously triggered to obtain time synchronization acquisition signals, the wireless ultrasonic sensor with the strongest signal is selected according to the intensity of the signals acquired by the wireless ultrasonic sensor, under the condition that the wireless ultrasonic sensors are arranged densely enough, the straight line of the wireless ultrasonic sensor and a discharge point is perpendicular to the side face of the transformer, the side face of the wireless ultrasonic sensor is the wireless ultrasonic sensor closest to the discharge position, and the wireless ultrasonic sensor is defined as AmDetermining its coordinates Am(xm，ym，zm) The coordinate of the wireless ultrasonic sensor is A as shown in FIG. 5m′(0，ym′，zm′)。
Due to the wireless ultrasonic sensor An′And Am′The straight lines respectively formed with the discharge positions are perpendicular to the side face of the transformer at the side, and the sensor A is arranged according to the geometric principlen′、Am′In the same plane as the location of the partial discharge, and parallel to the point S0、Si、SjPlane α in which y is locatedn′＝ym′As shown in fig. 4. Thus, the position coordinates P (x) of the discharge point can be calculatedn′，yn′，zm′)。
150, when the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposite, synchronously triggering the first wireless ultrasonic sensor and the second wireless ultrasonic sensor, recording the time interval of the signals reaching the first wireless ultrasonic sensor and the second wireless ultrasonic sensor, and positioning the partial discharge signals based on an ultrasonic signal time difference positioning method;
in particular, as shown in figure 5,when the first wireless ultrasonic sensor A is selectednWith a second wireless ultrasonic sensor AmWhen in the opposite surface, the wireless ultrasonic sensor An′And Am″The wireless ultrasonic sensor A is synchronously triggered and is positioned on the same straight line with the discharge position and is vertical to the two side surfaces of the transformern′And Am″The recorded signal arrives at An′And Am″Time interval τ.
Suppose that the partial discharge signal passes to An′And Am″Respectively at times t1And t2Then, it is obtained:
t1-t2＝τ (1)
suppose S0And SjL, the following equation can be derived:
c·t1+c·t2＝L (2)
where c is a constant, the electromagnetic wave propagation velocity.
The following equations (1) and (2) yield:
from this, the discharge position coordinates can be derived P
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A transformer partial discharge positioning method based on wireless ultrasound is characterized by comprising the following steps:
positioning a reference coordinator;
selecting the position of a wireless ultrasonic sensor;
synchronously triggering the reference coordinate device and the wireless ultrasonic sensor, selecting the wireless ultrasonic sensor with the strongest signal, and defining the wireless ultrasonic sensor as a first wireless ultrasonic sensor;
reselecting the non-heat-dissipation side face of the transformer, selecting the wireless ultrasonic sensor with the strongest signal of the non-heat-dissipation side face, and defining the wireless ultrasonic sensor as a second wireless ultrasonic sensor;
when the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are opposite, the first wireless ultrasonic sensor and the second wireless ultrasonic sensor are synchronously triggered, the time interval of the signals reaching the first wireless ultrasonic sensor and the second wireless ultrasonic sensor is recorded, and the partial discharge signals are positioned based on an ultrasonic signal time difference positioning method.
2. The transformer partial discharge positioning method based on wireless ultrasound as claimed in claim 1, wherein the positioning reference coordinate device is specifically: arranging position sensors on four vertex angles of the transformer, defining the four position sensors as reference coordinators with coordinates S0(0，0，0)、Si(1，0，0)、Sj(0，0，1)，Sh(0，1，0)。
3. The method for positioning partial discharge of the transformer based on wireless ultrasound as claimed in claim 1, wherein the selecting the position of the wireless ultrasound sensor specifically comprises: the wireless ultrasonic sensors are placed at equal intervals.
4. The method for locating partial discharge of transformer based on wireless ultrasound according to claim 1, wherein the wireless ultrasound sensor closest to the discharge position is selected on the side surface of the transformer, and the straight line of the wireless ultrasound sensor and the discharge point is perpendicular to the side surface of the transformer.
5. The wireless ultrasound-based transformer partial discharge positioning method of claim 2, wherein the first wireless ultrasound sensor has a coordinate an′(xn′，yn′0) and the second wireless ultrasonic sensor has the coordinate of Am′(0，ym′，zm′) In the same plane as the location of the partial discharge, and parallel to the point S0、Si、SjPlane α in which y is locatedn′＝ym′Calculating the position coordinate P (x) of the discharge pointn′，yn′，zm′)。
6. The wireless ultrasound-based transformer partial discharge positioning method of claim 2, wherein when the first wireless ultrasound sensor a is selectednWith a second wireless ultrasonic sensor AmWhen in the opposite surface, the wireless ultrasonic sensor An’、Am' the position of the recording signal reaches An' and AmTime interval of.
7. The wireless ultrasound-based transformer partial discharge localization method of claim 6, wherein it is assumed that a partial discharge signal is passed to An′And Am″Respectively at times t1And t2Then, it is obtained:
t1-t2＝τ (1)
suppose S0And SjL, the following equation is obtained:
c·t1+c·t2＝L (2)
where c is a constant, L is the electromagnetic wave propagation velocity;
the following equations (1) and (2) yield:
from this P' the discharge position coordinates are derived
8. A wireless ultrasound based transformer partial discharge location apparatus, characterized in that the apparatus performs the wireless ultrasound based transformer partial discharge location method according to any one of claims 1 to 7.
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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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| 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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| RU2814456C1 (en) * | 2023-06-16 | 2024-02-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" | Device for monitoring power transformers |
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