CN111239557B - Partial discharge positioning method based on online calibration - Google Patents
Partial discharge positioning method based on online calibration Download PDFInfo
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- CN111239557B CN111239557B CN202010081962.XA CN202010081962A CN111239557B CN 111239557 B CN111239557 B CN 111239557B CN 202010081962 A CN202010081962 A CN 202010081962A CN 111239557 B CN111239557 B CN 111239557B
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- 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
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Abstract
According to the local discharge positioning method based on online calibration, based on a charged indication coupling sensor, pulse voltage signals injected at two ends of a detection impedance are connected in series with C1 and C2 of the sensor to form a calibration pulse generator, generated discharge is injected into a circuit, and response discharge characteristics of each terminal are obtained online; when the circuit is subjected to partial discharge, the sensitivity of the measuring system is kept unchanged, the output discharge quantity response of the charged indication coupling sensor is obtained, and the position where the partial discharge occurs is determined through comparison with the response discharge quantity ratio during online calibration. The method is suitable for long lines and power distribution equipment with distributed parameter characteristics, and can realize accurate detection and rapid positioning of partial discharge positions of the power distribution lines and the equipment.
Description
Technical Field
The application relates to the technical field of monitoring of electrical equipment and line states, in particular to a partial discharge positioning method based on online calibration.
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 online calibration, 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 online calibration, which comprises the following steps:
calibrating the charged indication coupling sensors respectively by utilizing a calibration pulse generator;
when the charged indication coupling sensor is calibrated, respectively acquiring the response discharge capacity of a test point of the charged indication coupling sensor;
respectively acquiring the response discharge capacity ratio according to the response discharge capacity of the test point;
when partial discharge occurs, respectively acquiring partial discharge capacity at the test point of the charged indication coupling sensor;
acquiring a partial discharge capacity ratio according to the partial discharge capacity;
and judging the magnitude of the ratio of the partial discharge capacity to the response discharge capacity of the charged indication coupling sensor, wherein the partial discharge occurs at a position close to the charged indication coupling sensor with the ratio of the partial discharge capacity.
Optionally, the calibrating the charged indication coupled sensors by using the calibration pulse generator respectively includes:
injecting the calibration pulse generator from a first charged indication coupled sensor to a calibration point of an n charged indication coupled sensor in sequence, wherein the calibration pulse generator comprises a series connection of voltage amplitude u 0 The capacitance C of the calibration square wave and charged indication coupling sensor 1 And a capacitance C of the charged indication coupling sensor 2 ；
The amount of discharge q to be generated 0 Into the line, wherein
Is a high voltage index capacitor.
Optionally, when the charged indication coupling sensor is calibrated, respectively obtaining the discharge amount of the test point response of the charged indication coupling sensor, including:
when the nth charged indication coupling sensor is calibrated, response discharge amount q of the first charged indication coupling sensor is respectively obtained 1n A second charged indication coupling sensor q 2n And a third charged indication coupling sensor q 3n Fourth charged indication coupling sensor q 4n A fifth charged indication coupling sensor q 5n And a sixth charged indication coupling sensor q 6n 。
Optionally, the obtaining the response discharge capacity ratio according to the test point response discharge capacities respectively includes:
when the nth charged indication coupling sensor is calibrated, the response discharge capacity ratio is as follows:
optionally, when partial discharge occurs, the step of respectively obtaining partial discharge capacity at the test point of the charged indication coupling sensor includes:
when partial discharge occurs in the equipment, the sensitivity of the measuring system is kept unchanged, and the output response of each charged indication coupling sensor is measured to be q x1 、q x2 、q x3 、q x4 、q x5 And q is x6 。
Optionally, the obtaining a partial discharge capacity ratio according to the partial discharge capacity includes:
the ratio of the partial discharge capacity is as follows:
optionally, the determining the ratio of the partial discharge capacity to the response discharge capacity of the charged indication coupling sensor, where the partial discharge occurs at a position near the charged indication coupling sensor close to the ratio of the partial discharge capacity, includes:
will be provided with
And with
In contrast, a partial discharge occurs at a location near a charge indicating coupled sensor that is close to the partial discharge capacity ratio.
Optionally, the number of the charged indication coupling sensors is 6 but is not limited to 6;
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 online calibration, based on a plurality of charged indication coupling sensors, pulse voltage signals injected at two ends of detection impedance are connected with C1 and C2 of the sensors in series to form a calibration pulse generator, the generated discharge amount is injected into a line, and the response characteristic of each terminal is obtained online; when the circuit generates partial discharge, the sensitivity of the measuring system is kept unchanged, the output response of the charged indication coupling sensor is obtained, and the position of the partial discharge is determined by comparing the output response with the response ratio during online calibration. The method is suitable for long lines and power distribution equipment with distributed parameter characteristics, and can realize accurate detection and rapid positioning of partial discharge of the power distribution lines and the equipment.
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.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flowchart of a partial discharge positioning method based on online calibration according to the present application;
fig. 2 is a schematic diagram illustrating an application of the partial discharge localization method based on online calibration according to the present disclosure.
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 flowchart illustrating a partial discharge location method based on online calibration according to an embodiment of the present invention. The partial discharge positioning method based on online calibration provided by the embodiment of the present application is described below with reference to fig. 1.
As shown in fig. 1, the present application provides a partial discharge positioning method based on online calibration, including:
s110: the charged indication coupled sensors are respectively calibrated by utilizing a calibration pulse generator.
According to the embodiment of the application, based on the charged indication coupling sensor, pulse voltage signals injected at two ends of the detection impedance are connected with C1 and C2 of the sensor in series to form a calibration pulse generator, generated discharge amount is injected into a circuit, and response characteristics of each terminal are obtained on line.
Specifically, the calibration pulse generator is injected from a first charged indication coupling sensor to a calibration point of an n charged indication coupling sensor in sequence, wherein the calibration pulse generator comprises a voltage with the amplitude u connected in series in sequence 0 The capacitance C of the calibration square wave and charged indication coupling sensor 1 And a capacitor C of the charged indication coupling sensor 2 ；
The amount of discharge q to be generated 0 Is injected into the line, wherein
Is a high voltage index capacitor.
In the embodiment of the present application, taking n as 6 as an example, the calibration pulse generator is sequentially injected from the first charged indication coupled sensor to the 6 th charged indication coupled sensor to perform calibration.
S120: when the charged indication coupling sensor is calibrated, the response discharge amount of the test point of the charged indication coupling sensor is respectively obtained.
When the nth charged indication coupling sensor is calibrated, response discharge amount q of the first charged indication coupling sensor is respectively obtained 1n A second charged indication coupling sensor q 2n And a third charged indication coupling sensor q 3n Fourth charged indication coupling sensor q 4n A fifth charged indication coupling sensor q 5n And sixthCharged indicating coupling sensor q 6n 。
S130: and respectively acquiring the ratio of the response discharge capacity according to the response discharge capacity of the test point.
When the nth charged indication coupling sensor is calibrated, the response discharge capacity ratio is as follows:
s140: and when partial discharge occurs, respectively acquiring partial discharge capacity at the test point of the charged indication coupling sensor.
When partial discharge occurs in the equipment, the sensitivity of the measuring system is kept unchanged, and the output response of each charged indication coupling sensor is measured to be q x1 、q x2 、q x3 、q x4 、q x5 And q is x6 。
When the circuit generates partial discharge, the sensitivity of the measuring system is kept unchanged, the output response of the charged indication coupling sensor is obtained, and the position of the partial discharge is determined by comparing the output response with the response ratio during online calibration.
S150: and acquiring a partial discharge capacity ratio according to the partial discharge capacity.
The ratio of the partial discharge capacity is as follows:
s160: and judging the magnitude of the partial discharge capacity ratio and the response discharge capacity ratio of the charged indication coupling sensor, wherein partial discharge occurs at a position close to the charged indication coupling sensor with the partial discharge capacity ratio.
Will be provided with
And
in comparison, the method has the advantages that,partial discharges occur at locations in the vicinity of the charge indicating coupled sensor that are close to the partial discharge capacity ratio.
In the embodiment of the present application, the number of the charged indication coupling sensors may be 6 but is not limited to 6; 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.
In the embodiment of the present application, taking the number of the coupling sensors with the live indication as 6 and taking the partial discharge point near the calibration signal injection point 4 as an example, as shown in fig. 2, fig. 2 is an application schematic diagram of the partial discharge positioning method based on online calibration provided by the present application; the process of partial discharge localization is as follows:
before the partial discharge positioning, the voltage amplitude is set to be u 0 The calibration square wave is injected from the calibration point of the first charged indication coupling sensor to the calibration point of the sixth charged indication sensor in sequence, is connected with C1 and C2 of the charged indication coupling sensor in series to form a calibration pulse generator, and the generated discharge quantity q is generated 0 Injected into the line, the amount of charge injected is:
sequentially recording output discharge quantity responses of a sixth charged indication coupling sensor test point of the first charged indication coupling sensor;
note q 11 ～q 16 Indicating for the first charge the output discharge, q, of the test point of the coupled sensor 21 ～q 26 And indicating the output discharge capacity of the test point of the coupling sensor for the second electrification, and obtaining the output discharge capacities from the third electrification indication coupling sensor to the sixth electrification indication coupling sensor test point by analogy.
Obtaining a response discharge capacity ratio: when the first charge indicating coupled sensor is calibrated, the response discharge capacity ratio is:
when the second charged indication coupled sensor is calibrated, the response discharge capacity ratio is:
when the third charged indication coupled sensor is calibrated, the response discharge capacity ratio is:
when the fourth charged indication coupled sensor is calibrated, the response discharge capacity ratio is:
when the fifth charged indication coupled sensor is calibrated, the response discharge capacity ratio is:
when the sixth charged indication coupled sensor is calibrated, the response discharge capacity ratio is:
when partial discharge occurs to the equipment, the sensitivity of the measuring system is kept unchanged, and the output partial discharge capacity of each charged indication coupling sensor is measured to be q x1 、q x2 、q x3 、q x4 、q x5 And q is x6 Calculating the ratio f of partial discharge capacity 1 ～f 6 The following were used:
through comparison, the ratio f of partial discharge capacity is found 1 ～f 6 And determining that the line partial discharge point occurs near the calibration signal injection point of the fourth charged indication coupled sensor, which is the closest to the response ratio of the fourth charged indication coupled sensor injection point in the reference ratio.
According to the scheme, in the partial discharge positioning method based on online calibration, based on a plurality of charged indication coupling sensors, pulse voltage signals injected at two ends of detection impedance are connected with C1 and C2 of the sensors in series to form a calibration pulse generator, the generated discharge amount is injected into a line, and the response characteristic of each terminal is obtained online; when the circuit generates partial discharge, the sensitivity of the measuring system is kept unchanged, the output response of the charged indication coupling sensor is obtained, and the position of the partial discharge is determined by comparing the output response with the response ratio during online calibration. The method is suitable for long lines and power distribution equipment with distributed parameter characteristics, and can realize accurate detection and rapid positioning of partial discharge of the power distribution lines and the equipment.
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 (8)
1. A partial discharge positioning method based on online calibration is characterized by comprising the following steps:
calibrating the charged indication coupling sensors by using a calibration pulse generator, wherein the set number of the charged indication coupling sensors is 6;
after the charged indication coupling sensor is calibrated, respectively acquiring the response discharge capacity of a test point of the charged indication coupling sensor;
respectively acquiring the response discharge capacity ratio according to the response discharge capacity of the test point;
when partial discharge occurs, respectively acquiring partial discharge capacity at the test point of the charged indication coupling sensor;
acquiring a partial discharge capacity ratio according to the partial discharge capacity;
and judging the magnitude of the ratio of the partial discharge capacity to the response discharge capacity of the charged indication coupling sensor, wherein the partial discharge occurs at a position close to the charged indication coupling sensor with the ratio of the partial discharge capacity.
2. The method for locating partial discharge based on online calibration according to claim 1, wherein the calibrating the charged indication coupled sensors respectively by using the calibration pulse generator comprises:
injecting the calibration pulse generator from a first charged indication coupled sensor to a calibration point of an n charged indication coupled sensor in sequence, wherein the calibration pulse generator comprises a series connection of voltage amplitude u 0 The capacitance C of the calibration square wave and charged indication coupling sensor 1 And a capacitance C of the charged indication coupling sensor 2 ；
The amount of discharge q to be generated 0 Into the line, wherein
Is a high voltage index capacitor.
3. The method for locating partial discharge based on online calibration according to claim 1, wherein the step of respectively acquiring test point response discharge quantities of the charged indication coupled sensors when the charged indication coupled sensors are calibrated comprises:
when the nth charged indication coupling sensor is calibrated, response discharge amount q of the first charged indication coupling sensor is respectively obtained 1n A second charged indication coupling sensor q 2n And a third charged indication coupling sensor q 3n Fourth charged indication coupling sensor q 4n A fifth charged indication coupling sensor q 5n And a sixth charged indication coupling sensor q 6n 。
4. The method for positioning partial discharge based on online calibration according to claim 1, wherein the obtaining of the ratio of the response discharge quantities according to the test point response discharge quantities respectively comprises:
when the nth charged indication coupling sensor is calibrated, the response discharge capacity ratios of the 6 charged indication coupling sensors are respectively as follows:
5. the method for locating partial discharge based on online calibration according to claim 1, wherein when partial discharge occurs, respectively acquiring partial discharge quantities at the test points of the charged indication coupled sensor, comprises:
when partial discharge occurs in the equipment, the sensitivity of the measuring system is kept unchanged, and the output responses of the 6 charged indication coupling sensors are measured to be q respectively x1 、q x2 、q x3 、q x4 、q x5 And q is x6 。
6. The on-line calibration based partial discharge positioning method according to claim 4, wherein the obtaining a partial discharge capacity ratio according to the partial discharge capacity comprises:
the partial discharge capacity ratios of the 6 charged indication coupling sensors are respectively as follows:
7. the on-line calibration based partial discharge positioning method according to claim 6, wherein the determining the magnitude of the partial discharge capacity ratio and the response discharge capacity ratio of the charged indication coupled sensor, the partial discharge occurring at a position close to the charged indication coupled sensor with the partial discharge capacity ratio, comprises:
will be provided with
And
in contrast, a partial discharge occurs at a location near a charge indicating coupled sensor that is close to the partial discharge capacity ratio.
8. The on-line calibration based partial discharge positioning method according to claim 1, wherein the number of the charged indication coupled sensors is 6 but not limited to 6;
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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| CN105319524A (en) * | 2015-11-16 | 2016-02-10 | 国家电网公司 | A high tension switchgear partial discharge live detection effectiveness judgment method |
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