CN111239560B - Multi-sensor-based partial discharge positioning method - Google Patents

Multi-sensor-based partial discharge positioning method Download PDF

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CN111239560B
CN111239560B CN202010081971.9A CN202010081971A CN111239560B CN 111239560 B CN111239560 B CN 111239560B CN 202010081971 A CN202010081971 A CN 202010081971A CN 111239560 B CN111239560 B CN 111239560B
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partial discharge
sensor
voltage difference
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CN111239560A (en
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刘红文
赵现平
张春丽
王科
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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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
    • 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
    • G01R31/1227—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 of components, parts or materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract

In the multi-sensor-based partial discharge positioning method, firstly, before partial discharge positioning, voltage is appliedAmplitude u0The calibration square wave is injected from a calibration point of the charged indication coupling sensor to calibrate a line, then response voltage difference values of all the charged indication coupling sensors are sequentially obtained, then partial discharge voltage difference values during partial discharge are obtained, the partial discharge voltage difference values are compared with the response voltage difference values of all the charged indication coupling sensors, wherein the partial discharge voltage difference values are the same as the positive and negative of the difference values of the group, and the partial discharge is judged to be generated at a position close to the charged indication coupling sensors; this application is based on electrified multiple spot calibration and the test of instructing coupling sensor, utilizes partial discharge pulse signal to transmit the decay characteristic of each electrified instruction coupling sensor through high voltage bus, and the accurate detection and the quick location of distribution lines and equipment partial discharge can be realized to impulse voltage difference value when contrast partial discharge takes place and online calibration.

Description

Multi-sensor-based partial discharge positioning method
Technical Field
The application relates to the technical field of electrical equipment and line state monitoring, in particular to a partial discharge positioning method based on multiple sensors.
Background
Partial discharge is an important insulation technical index of high-voltage power equipment, and is widely applied to performance detection of the high-voltage power equipment. In recent years, many researchers and institutions at home and abroad research the generation mechanism and basic discharge characteristics of partial discharge by methods such as experimental research, theoretical analysis, physical modeling and the like, and research results show that the partial discharge has close relation with the type of applied voltage, the material characteristics of an insulating medium, the electric field distribution at a defect and space charges generated by discharge.
Partial discharge detection technology based on ultrasonic, ultrahigh frequency and transient ground voltage is currently widely applied, such as: the first method comprises the following steps: receiving electromagnetic waves emitted by partial discharge equipment during partial discharge by using a directional antenna, displaying time domain signals of the electromagnetic waves by using a signal measuring device, horizontally rotating a fixed rod by using the middle point of the fixed rod as a fixed fulcrum, and obtaining two measuring point positions with zero time difference by changing, wherein the intersection point of the two perpendicular lines is a partial discharge position; the second method comprises the following steps: carrying out partial discharge detection on the switch cabinet by using an ultrasonic detection method, and arranging a flexible ultrasonic sensor in the switch cabinet to carry out partial discharge positioning; the third method comprises the following steps: the method comprises the steps of establishing an RSSI fingerprint map according to a discharge signal by utilizing the discharge signal generated by the obtained partial discharge source, obtaining coordinates of the partial discharge source in a detected area according to the RSSI fingerprint map and a generalized recurrent neural network model, and realizing the positioning of the partial discharge source by utilizing an ultrahigh frequency signal in combination with an RSSI fingerprint technology and the generalized recurrent neural network model.
However, in the methods disclosed above, no on-line calibration work is performed on the system or the line in advance, which causes a certain error in the electrical signals measured by various sensors, and the signal result has higher accidental factors.
Disclosure of Invention
The application provides a partial discharge positioning method based on multiple sensors, which aims to solve the technical problem that the partial discharge position cannot be accurately detected because a system is not calibrated in advance.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the application provides a partial discharge positioning method based on multiple sensors, which comprises the following steps:
using a voltage amplitude u0The calibration square waves respectively calibrate the charged indication coupling sensors;
when the charged indication coupling sensor is calibrated, respectively acquiring the response voltage of a test point of the charged indication coupling sensor;
respectively acquiring a response voltage difference value according to the response voltage of the test point;
when partial discharge occurs, respectively acquiring partial discharge voltage at the test point of the charged indication coupling sensor;
acquiring a partial discharge voltage difference value according to the partial discharge voltage;
and judging the positivity and the negativity of the partial discharge voltage difference value and the response voltage difference value of the charged indication coupling sensor, wherein partial discharge occurs at a position near the charged indication coupling sensor with the same positivity and the negativity as the partial discharge voltage difference value.
Optionally, the amplitude of the utilization voltage is u0The calibration square waves respectively calibrate the charged indication coupled sensors, and the calibration square waves comprise:
the voltage amplitude is u0The calibration square wave is injected into a point a of the first charged indication coupling sensor, a point b of the second charged indication coupling sensor and a point c of the third charged indication coupling sensor in sequence.
Optionally, when calibrating the charged indication coupling sensor, respectively acquiring the test point response voltages of the charged indication coupling sensor, including:
when the point a of the first charged indication coupling sensor is calibrated, the response voltage u of the point a of the first charged indication coupling sensor is respectively obtaineda1A second charged indication coupled sensor's b-point response voltage ub1And a third voltage indicating the response voltage u at point c of the coupled sensorc1；
When the point b of the second charged indication coupling sensor is calibrated, the response voltage u of the point a of the first charged indication coupling sensor is respectively obtaineda2A second charged indication coupled sensor's b-point response voltage ub2And a third voltage indicating the response voltage u at point c of the coupled sensorc2；
When the point c of the third charged indication coupling sensor is calibrated, the response voltage u of the point a of the first charged indication coupling sensor is respectively obtaineda3A second charged indication coupled sensor's b-point response voltage ub3And a third voltage indicating the response voltage u at point c of the coupled sensorc3。
Optionally, the obtaining the response voltage difference values according to the test point response voltages respectively includes:
when calibrating point a of the first charged indicator coupled sensor, the response voltage difference is:
Figure BDA0002380627140000021
when point b of the second charged indication coupled sensor is calibrated, the response voltage difference is:
Figure BDA0002380627140000022
when point c of the third charged indication coupled sensor is calibrated, the response voltage difference is:
Figure BDA0002380627140000023
optionally, when the partial discharge occurs, the obtaining the partial discharge voltage at the test point of the charged indication coupling sensor respectively includes:
when partial discharge occurs, the voltage u is measured at the three partial discharge test points a, b and c respectivelyax、ubxAnd ucx。
Optionally, the obtaining a partial discharge voltage difference according to the partial discharge voltage includes:
the difference value of the partial discharge voltage is as follows:
Figure BDA0002380627140000024
optionally, the determining whether the partial discharge voltage difference value and the response voltage difference value of the charged indication coupled sensor are positive or negative, where the partial discharge occurs at a position near the charged indication coupled sensor with the same positive or negative as the partial discharge voltage difference value, includes:
if it is
Figure BDA0002380627140000025
And
Figure BDA0002380627140000026
if the positive and negative are the same in the result, the partial discharge is performedElectricity is generated near the first charged indicator coupled sensor.
Optionally, the determining whether the partial discharge voltage difference value and the response voltage difference value of the charged indication coupled sensor are positive or negative, where the partial discharge occurs at a position near the charged indication coupled sensor with the same positive or negative as the partial discharge voltage difference value, includes:
if it is
Figure BDA0002380627140000031
And
Figure BDA0002380627140000032
if the positive and negative are the same, then a partial discharge occurs near the second charge indicating coupled sensor.
Optionally, the determining whether the partial discharge voltage difference value and the response voltage difference value of the charged indication coupled sensor are positive or negative, where the partial discharge occurs at a position near the charged indication coupled sensor with the same positive or negative as the partial discharge voltage difference value, includes:
if it is
Figure BDA0002380627140000033
And
Figure BDA0002380627140000034
if the result of (a) is positive or negative, then a partial discharge occurs near the third charged indication coupled sensor location.
Alternatively, the number of the charged indication coupling sensors may be 3 but is not limited to 3;
the charged indication coupling sensor comprises a high-voltage capacitor and a detection impedance, and a partial discharge calibration interface and a partial discharge test interface are arranged between the high-voltage capacitor and the detection impedance.
Compared with the prior art, the beneficial effect of this application is:
according to the scheme, in the partial discharge positioning method based on the multiple sensors, firstly, the voltage amplitude is u before partial discharge positioning0Of the calibration square waveInjecting a calibration signal from a calibration point of the charged indication coupling sensor to calibrate a line, sequentially acquiring a response voltage difference value of each charged indication coupling sensor, acquiring a partial discharge voltage difference value during partial discharge, comparing the partial discharge voltage difference value with the response voltage difference value of each charged indication coupling sensor, wherein the difference value of which group has the same positive and negative polarities, and judging that the partial discharge occurs at a position close to the charged indication coupling sensor injected by the calibration signal; this application is based on electrified multiple spot calibration and the test of instructing coupling sensor, utilizes partial discharge pulse signal to transmit the decay characteristic of each electrified instruction coupling sensor through high voltage bus, can survey the impulse voltage signal of variation in size on each test point, and the accurate detection and the quick location of distribution lines and equipment partial discharge can be realized to the impulse voltage difference value when contrast partial discharge takes place and online calibration.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a multi-sensor based partial discharge positioning method provided in the present application;
FIG. 2 is a schematic diagram of the application of the multi-sensor based partial discharge localization method provided herein;
fig. 3 is a schematic diagram of another application of the multi-sensor based partial discharge localization method provided in the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. 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 application.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a multi-sensor-based partial discharge location method according to an embodiment of the present invention. The following describes a multi-sensor based partial discharge localization method provided by an embodiment of the present application with reference to fig. 1.
As shown in fig. 1, the present application provides a method for locating partial discharge based on multiple sensors, including:
s110: using a voltage amplitude u0The calibration square waves of (a) respectively calibrate the charged indication coupled sensors.
The amplitude of the voltage generated by calibrating the square-wave generator is u0The calibration square wave is sequentially injected into a point a of the first charged indication coupling sensor, a point b of the second charged indication coupling sensor, and a point c of the third charged indication coupling sensor, where the points a, b, and c refer to positions in fig. 2, and fig. 2 is an application schematic diagram of the multi-sensor-based partial discharge positioning method provided in the present application.
S120: when the charged indication coupling sensors are calibrated, the response voltages of the test points of the charged indication coupling sensors are respectively obtained.
When the point a of the first charged indication coupling sensor is calibrated, the response voltage u of the point a of the first charged indication coupling sensor is respectively obtaineda1A second charged indication coupled sensor's b-point response voltage ub1And a third voltage indicating the response voltage u at point c of the coupled sensorc1；
When the point b of the second charged indication coupling sensor is calibrated, the response voltage u of the point a of the first charged indication coupling sensor is respectively obtaineda2A second charged indication coupled sensor's b-point response voltage ub2And a third voltage indicating the response voltage u at point c of the coupled sensorc2；
When the point c of the third charged indication coupling sensor is processedIn calibration, the response voltage u of the point a of the first charged indication coupling sensor is respectively obtaineda3A second charged indication coupled sensor's b-point response voltage ub3And a third voltage indicating the response voltage u at point c of the coupled sensorc3。
S130: and respectively acquiring a response voltage difference value according to the response voltage of the test point.
When calibrating point a of the first charged indicator coupled sensor, the response voltage difference is:
Figure BDA0002380627140000041
wherein, Δ u11、Δu21And Δ u31Are all greater than 0, and ua1And max.
When the point b of the second charged indication coupled sensor is calibrated, the response voltage difference is:
Figure BDA0002380627140000042
wherein, Δ u12Less than 0, Δ u32Greater than 0, and ub2And max.
When point c of the third charged indication coupled sensor is calibrated, the response voltage difference is:
Figure BDA0002380627140000043
wherein, Δ u13、Δu23、Δu33Are all less than 0, and uc3And max.
S140: and when partial discharge occurs, respectively acquiring partial discharge voltage at the test point of the charged indication coupling sensor.
When partial discharge occurs, the voltage u is respectively measured at three partial discharge test points a, b and cax、ubxAnd ucx。
S150: and acquiring a partial discharge voltage difference value according to the partial discharge voltage.
The difference value of the partial discharge voltage is as follows:
Figure BDA0002380627140000051
s160: and judging the positivity and the negativity of the partial discharge voltage difference value and the response voltage difference value of the charged indication coupling sensor, wherein partial discharge occurs at a position near the charged indication coupling sensor with the same positivity and the negativity as the partial discharge voltage difference value.
If it is
Figure BDA0002380627140000052
And
Figure BDA0002380627140000053
if the result of (a) is positive or negative, then a partial discharge occurs near the first charged indicator coupled sensor.
If it is
Figure BDA0002380627140000054
And
Figure BDA0002380627140000055
if the positive and negative are the same, then a partial discharge occurs near the second charge indicating coupled sensor.
If it is
Figure BDA0002380627140000056
And
Figure BDA0002380627140000057
if the result of (a) is positive or negative, then a partial discharge occurs near the third charged indication coupled sensor location.
As can be seen from the above, the partial discharge voltage difference is compared with the response voltage difference of each charged indication coupled sensor, and the difference of which group has the same positive and negative polarities, so as to determine that the partial discharge occurs at the position close to the charged indication coupled sensor to which the calibration signal is injected.
In the embodiment of the present application, the number of the charged indication coupling sensors may be 3 but is not limited to 3; the installation number of the charged indication coupling sensors is properly increased or decreased according to the actual application system; the charged indication coupling sensor comprises a high-voltage capacitor and a detection impedance, and a partial discharge calibration interface and a partial discharge test interface are arranged between the high-voltage capacitor and the detection impedance.
Example 1:
referring to fig. 3, fig. 3 is a schematic diagram of another application of the multi-sensor based partial discharge localization method provided in the present application.
Taking the example that the partial discharge point is near the second charged indication coupled sensor, and the distance from the partial discharge point to the first charged indication coupled sensor is smaller than the distance from the partial discharge point to the third charged indication coupled sensor, the specific partial discharge positioning process is as follows:
before the partial discharge positioning, the voltage amplitude is set to be u0The calibration square waves are injected from calibration points of a first charged indication coupling sensor, a second charged indication coupling sensor and a third charged indication coupling sensor in sequence;
sequentially recording output voltage responses of test points of a first charged indication coupling sensor, a second charged indication coupling sensor and a third charged indication coupling sensor;
the voltage measured at point a of the sensor 1 is ua1、ua2、ua3The voltage measured at point b of the sensor 2 is ub1、ub2、ub3The voltage measured at point c of the sensor 3 is uc1、uc2、uc3；
Calculating the response voltage difference value and the change rule of each test point;
when the calibration square wave signal is injected from the point a of the sensor 1, the response voltage difference is:
Figure BDA0002380627140000058
wherein, Δ u11、Δu21And Δ u31Are all greater than 0, and ua1And max.
When injected from point b of sensor 2, the response voltage difference is:
Figure BDA0002380627140000061
wherein, Δ u12Less than 0, Δ u22、Δu32Greater than 0, and ub2And max.
When injected from point c of sensor 3, the response voltage difference is:
Figure BDA0002380627140000062
wherein, Δ u13、Δu23、Δu33Are all less than 0, and uc3And maximum.
Respectively measuring the voltage u at three partial discharge test points a, b and cax、ubxAnd ucxAnd calculating the response voltage difference as follows:
Figure BDA0002380627140000063
and Δ u1xLess than 0, Δ u2x、Δu3xAre all greater than 0, and ubxAnd max.
It can be seen that Δ u12Less than 0, Δ u22、Δu32Greater than 0, and Δ u1xLess than 0, Δ u2x、Δu3xAre all larger than 0, the partial discharge voltage difference has the same positive or negative property as the response voltage difference of the second charged indicating coupled sensor, so that the partial discharge is generated at the position close to the second charged indicating coupled sensor.
According to the scheme, in the partial discharge positioning method based on the multiple sensors, firstly, the voltage amplitude is u before partial discharge positioning0Calibration square wave injection pair from calibration point of charged indication coupled sensorThe line is calibrated, then response voltage difference values of all the charged indication coupling sensors are sequentially obtained, then partial discharge voltage difference values during partial discharge are obtained, the partial discharge voltage difference values are compared with the response voltage difference values of all the charged indication coupling sensors, the difference values of the partial discharge voltage difference values are the same as the positive and negative of the group of the partial discharge voltage difference values, and the partial discharge is judged to be generated at the position close to the charged indication coupling sensors injected by the calibration signal; this application is based on electrified multiple spot calibration and the test of instructing coupling sensor, utilizes partial discharge pulse signal to transmit the decay characteristic of each electrified instruction coupling sensor through high voltage bus, can survey the impulse voltage signal of variation in size on each test point, and the accurate detection and the quick location of distribution lines and equipment partial discharge can be realized to the impulse voltage difference value when contrast partial discharge takes place and online calibration.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.

Claims (10)

1. A partial discharge positioning method based on multiple sensors is characterized by comprising the following steps:
using a voltage amplitude u0The calibration square waves respectively calibrate the charged indication coupling sensors;
when the charged indication coupling sensor is calibrated, respectively acquiring test point response voltages of the charged indication coupling sensor;
respectively acquiring a response voltage difference value according to the response voltage of the test point, wherein the response voltage difference value is the response voltage difference value between the two electrified indicating coupled sensors;
when partial discharge occurs, respectively acquiring partial discharge voltage at the test point of the charged indication coupling sensor;
acquiring a partial discharge voltage difference value according to the partial discharge voltage;
and judging the positivity and the negativity of the partial discharge voltage difference value and the response voltage difference value of the charged indication coupling sensor, wherein partial discharge occurs at a position near the charged indication coupling sensor with the same positivity and the negativity as the partial discharge voltage difference value.
2. The multi-sensor based partial discharge localization method of claim 1, wherein the utilization voltage has a magnitude of u0The calibration square waves respectively calibrate the charged indication coupled sensors, and the calibration square waves comprise:
the voltage amplitude is u0The calibration square wave is injected into a test point of the first charged indication coupling sensor, a test point of the second charged indication coupling sensor and a test point of the third charged indication coupling sensor in sequence.
3. The multi-sensor based partial discharge positioning method of claim 1, wherein the obtaining test point response voltages of the charged indication coupled sensors respectively when the charged indication coupled sensors are calibrated comprises:
when the test point of the first charged indication coupling sensor is calibrated, the response voltage u of the test point of the first charged indication coupling sensor is respectively obtaineda1A second charge indication coupled sensor test point response voltage ub1And a third voltage indicating response voltage u of the test point of the coupled sensorc1；
When the test points of the second charged indication coupling sensor are calibrated, the first charged indication coupling is respectively obtainedResponse voltage u of test point of combined sensora2A response voltage u of a test point of a second charged indication coupled sensorb2And a third response voltage u of the test point of the charge indicating coupled sensorc2；
When the test point of the third charged indication coupling sensor is calibrated, the response voltage u of the test point of the first charged indication coupling sensor is respectively obtaineda3A second charge indication coupled sensor test point response voltage ub3And a third voltage indicating response voltage u of the test point of the coupled sensorc3。
4. The multi-sensor based partial discharge positioning method according to claim 3, wherein the obtaining response voltage difference values according to the test point response voltages respectively comprises:
when the test point of the first charged indication coupled sensor is calibrated, the response voltage difference is:
Figure FDA0003502923150000011
when the test point of the second charged indication coupling sensor is calibrated, the response voltage difference is:
Figure FDA0003502923150000012
when the test point of the third charged indication coupling sensor is calibrated, the response voltage difference is as follows:
Figure FDA0003502923150000021
5. the multi-sensor based partial discharge positioning method according to claim 4, wherein the obtaining partial discharge voltages respectively at the test points of the charged indication coupled sensor when partial discharge occurs comprises:
when partial discharge occurs, the voltage u is respectively measured at the first partial discharge test point, the second partial discharge test point and the third partial discharge test pointax、ubxAnd ucx。
6. The multi-sensor based partial discharge positioning method according to claim 5, wherein the obtaining a partial discharge voltage difference value according to the partial discharge voltage comprises:
the difference value of the partial discharge voltage is as follows:
Figure FDA0003502923150000022
7. the multi-sensor based partial discharge positioning method according to claim 6, wherein said determining whether the partial discharge voltage difference value and the response voltage difference value of the charged indication coupled sensor are positive or negative, and the partial discharge occurs at a position near the charged indication coupled sensor with the same positive or negative as the partial discharge voltage difference value comprises:
if it is
Figure FDA0003502923150000023
And
Figure FDA0003502923150000024
if the positive and negative are the same, then a partial discharge occurs near the first charged indicating coupled sensor.
8. The multi-sensor based partial discharge positioning method according to claim 6, wherein said determining whether the partial discharge voltage difference value and the response voltage difference value of the charged indication coupled sensor are positive or negative, and the partial discharge occurs at a position near the charged indication coupled sensor with the same positive or negative as the partial discharge voltage difference value comprises:
if it is
Figure FDA0003502923150000025
And
Figure FDA0003502923150000026
if the positive and negative are the same, then a partial discharge occurs near the second charge indicating coupled sensor.
9. The multi-sensor based partial discharge positioning method according to claim 6, wherein said determining whether the partial discharge voltage difference value and the response voltage difference value of the charged indication coupled sensor are positive or negative, and the partial discharge occurs at a position near the charged indication coupled sensor with the same positive or negative as the partial discharge voltage difference value comprises:
if it is
Figure FDA0003502923150000027
And
Figure FDA0003502923150000028
if the result of (a) is positive or negative, then a partial discharge occurs near the third charged indication coupled sensor location.
10. The multi-sensor based partial discharge positioning method according to claim 1, wherein the number of the charged indication coupled sensors is 3;
the charged indication coupling sensor comprises a high-voltage capacitor and a detection impedance, and a partial discharge calibration interface and a partial discharge test interface are arranged between the high-voltage capacitor and the detection impedance.
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