CN111913127B - Intelligent detection device and method for tubular bus - Google Patents

Intelligent detection device and method for tubular bus Download PDF

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Publication number
CN111913127B
CN111913127B CN202010609682.1A CN202010609682A CN111913127B CN 111913127 B CN111913127 B CN 111913127B CN 202010609682 A CN202010609682 A CN 202010609682A CN 111913127 B CN111913127 B CN 111913127B
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leakage current
detection device
tubular
bus
temperature
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CN111913127A (en
Inventor
宫衍圣
王强
吴波
杨筱安
王继来
张学武
余纲
李景坤
赵玮
刘刚
隋延民
魏光
聂晶鑫
谷元平
邓波
胡渊
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China Railway First Survey and Design Institute Group Ltd
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China Railway First Survey and Design Institute Group 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
    • G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0428—Safety, monitoring
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2612—Data acquisition interface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The present disclosure relates to a tubular busbar intelligent detection device and method, the device comprising: the device comprises a fixed support, a temperature detection device, a leakage current detection device and a dielectric loss detection device; the fixed support is arranged on the connecting device of the tubular bus, and the temperature detection device, the leakage current detection device and the dielectric loss detection device are arranged on the fixed support; the temperature measuring probe of the temperature detecting device is contacted with the outer wall of the tubular bus and used for detecting the surface temperature of the tubular bus in real time; the leakage current detection device is connected with the shielding layer grounding wire of the tubular bus and is used for detecting the leakage current of the tubular bus in real time; the dielectric loss detection device is connected with the shielding layer grounding wire of the tubular bus and the secondary side of the bus voltage transformer of the tubular bus and is used for detecting the dielectric loss factor of the tubular bus in real time. The embodiment of the disclosure can detect the insulation performance of the tubular bus in the operation process, and can solve the problem that the safe operation of the tubular bus cannot be ensured.

Description

Intelligent detection device and method for tubular bus
Technical Field
The disclosure relates to the technical field of tubular busbar detection, in particular to an intelligent tubular busbar detection device and method.
Background
Currently, solid insulated tubular buses are used as large-current transmission equipment, are widely applied to transformer substations and power transmission and transformation lines gradually, and are used as main carriers for power transmission, and detection in the installation and use processes is extremely necessary.
However, current detection of tubular bus bars is also only stayed: 1) In the project construction stage, the acceptance test of equipment before operation is carried out, wherein test projects comprise power frequency tolerance test, dielectric loss detection, appearance inspection after installation is finished and the like; 2) Preventive tests on the tubular bus bar will be performed annually or every few years during operation. However, the above detection method is very inconvenient and has an influence on the production or operation on site; meanwhile, the detection hand only stays in partial stages and cannot be used for judging the reliability and stability of the insulating performance of the tubular bus, so that the safe operation of the tubular bus cannot be ensured.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
In order to solve the technical problems or at least partially solve the technical problems, the disclosure provides an intelligent detection device and method for tubular bus bars, so as to realize the detection of the reliability and stability of the insulating performance of the tubular bus bars in the operation process and improve the problem that the safe operation of the tubular bus bars cannot be guaranteed.
The disclosure provides a tubular busbar intelligent detection device, which comprises a fixed support, a temperature detection device, a leakage current detection device and a dielectric loss detection device;
the fixed support is arranged on the connecting device of the tubular bus, and the temperature detection device, the leakage current detection device and the dielectric loss detection device are arranged on the fixed support;
the temperature measuring probe of the temperature detecting device is contacted with the outer wall of the tubular bus and is used for detecting the surface temperature of the tubular bus in real time;
the leakage current detection device is connected with the shielding layer grounding wire of the tubular bus and is used for detecting the leakage current of the tubular bus in real time;
the dielectric loss detection device is connected with the shielding layer grounding wire of the tubular bus and the secondary side of the bus voltage transformer of the tubular bus and is used for detecting the dielectric loss factor of the tubular bus in real time.
Optionally, the temperature detection device comprises a temperature sensor, and a temperature measurement probe of the temperature sensor is in contact with the outer wall of the tubular busbar.
Optionally, the leakage current detection device includes a first leakage current sensor, and the first leakage current sensor is connected with a shielding layer ground wire of the tubular busbar.
Optionally, the dielectric loss detection device comprises a busbar voltage sensor, a second leakage current sensor, a third leakage current sensor and a loss data processing unit;
the second leakage current sensor and the third leakage current sensor are a pair of through zero-flux current sensors with reverse wiring, are respectively connected with a shielding layer grounding wire of the tubular bus and are used for collecting leakage current of the tubular bus; the bus voltage sensor is connected with the secondary side of the bus voltage transformer of the tubular bus and is used for collecting bus voltage signals of the tubular bus;
the loss data processing unit is used for determining the dielectric loss factor of the tubular bus according to the leakage current collected by the second leakage current sensor and the third leakage current sensor and the bus voltage signal collected by the bus voltage sensor.
Optionally, the first leakage current sensor and the second leakage current sensor are the same component.
Optionally, the first leakage current sensor is a zero flux leakage current sensor.
The invention also provides an intelligent detection method for the tubular bus, which is implemented by using the intelligent detection device for the tubular bus, wherein the intelligent detection device for the tubular bus comprises a temperature detection device, a leakage power detection device, a dielectric loss detection device and a processor; the method comprises the following steps:
the method comprises the steps that a temperature detection device obtains the surface temperature of a tubular bus, a leakage current detection device obtains the leakage current of the tubular bus, and a dielectric loss detection device obtains the leakage current and the bus voltage of the tubular bus;
the processor determines the inner conductor temperature of the tubular bus based on the surface temperature and the environment temperature of the tubular bus obtained by the temperature detection device;
the processor determines the leakage current of the tubular bus based on the single leakage current of the tubular bus, which is obtained by the leakage current detection device and is continuous for N times;
the processor determines a dielectric loss tangent of the tubular bus based on the leakage current and the bus voltage of the tubular bus acquired by the dielectric loss detection device.
Optionally, the temperature detection device includes a temperature sensor, the leakage current detection device includes a first leakage current sensor, and the dielectric loss detection device includes a bus voltage sensor, a second leakage current sensor, and a third leakage current sensor;
the processor determining the inner conductor temperature of the tubular busbar based on the surface temperature and the ambient temperature of the tubular busbar acquired by the temperature detection device comprises:
the inner conductor temperature is calculated using the formula:
T＝4e T1/T0 +T1，
wherein T is the temperature of an inner conductor of the tubular busbar; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is the ambient temperature;
the processor determining the leakage current of the tubular bus based on the single leakage current of the tubular bus for N consecutive times acquired by the leakage current detection device includes:
the leakage current was calculated using the following formula:
Figure BDA0002560553210000031
wherein I is Leakage current Is leakage current; i 1 A value acquired for the 1 st time of the first leakage current sensor; i 2 A value for the 2 nd acquisition of the first leakage current sensor; i n A value acquired for an nth time of the first leakage current sensor;
the processor determining the dielectric loss tangent of the tubular bus based on the leakage current and the bus voltage of the tubular bus obtained by the dielectric loss detection device comprises:
the dielectric loss tangent is calculated using the formula:
Tanδ＝tan(a+b-c×2)，
wherein Tan delta is the dielectric loss tangent; a is the leakage current phase angle output by the second leakage current sensor; b is the leakage current phase angle output by the third leakage current sensor; c is the phase angle of the bus voltage output by the bus voltage sensor.
Optionally, the method further comprises the steps of:
the capacitance of the tubular busbar was calculated using the following:
Figure BDA0002560553210000041
wherein C is the capacitance of the tubular bus, I1 is the leakage current effective value of the second leakage current sensor, I2 is the leakage current effective value of the third leakage current sensor, f is the bus voltage frequency, a is the leakage current phase angle output by the second leakage current sensor, b is the leakage current phase angle output by the third leakage current sensor, C is the phase angle of the bus voltage, and U is the bus voltage effective value.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: the intelligent detection device for the tubular bus is characterized in that the temperature detection device, the leakage current detection device and the dielectric loss detection device are fixed at the position of the connecting device of the tubular bus through the fixed support, so that the temperature, the leakage current and the dielectric loss of the tubular bus can be detected intelligently and online in real time, the reliability and the stability of the insulating performance of the tubular bus can be judged in real time, and the operation safety of the tubular bus is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is an installation schematic diagram of a tubular busbar intelligent detection device provided in an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a tubular busbar intelligent detection device according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of another tubular busbar intelligent detection device according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a tubular busbar intelligent detection method according to an embodiment of the disclosure.
Wherein: the device comprises a 1-tubular bus, a 2-tubular bus connecting device, a 3-fixed support, a 4-temperature sensor, a 5-second leakage current sensor, a 6-third leakage current sensor, a 7-shielding layer grounding wire, an 8-bus voltage sensor and a 9-background monitoring system.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure. The various embodiments of the present disclosure generally described and illustrated in the figures herein may be combined with one another without conflict, wherein structural components or functional modules may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the disclosure, as claimed, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings, or are orientation or positional relationships conventionally put in use of the disclosed product, only for convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure. Furthermore, relational terms such as first, second, third, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present disclosure, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.
The tubular busbar (hereinafter may be simply referred to as "tubular busbar") intelligent detection device provided by the embodiment of the disclosure may perform intelligent online detection on the tubular busbar, that is, perform real-time detection in the operation of the tubular busbar, and specifically includes: 1) Detecting the conductor temperature rise of the tubular bus on line; 2) Detecting leakage current of a shielding layer of the tubular bus on line; 3) The dielectric loss and the capacitance of the insulating material of the tubular bus are detected on line, so that the reliability and the stability of the tubular bus are detected, and the operation safety of the tubular bus is improved.
Further, a data processing unit is arranged in the temperature detection device of the intelligent bus detection device, so that the measured temperature of the tubular bus can be compensated, and the detected temperature data is more accurate; in the bus intelligent detection device, the leakage current detection device adopts a zero-flux leakage current sensor to detect leakage current, and the measurement accuracy is higher; in the bus intelligent detection device, a pair of through zero-flux current sensors with reverse wiring are adopted to detect the dielectric loss factor, and the pair of current sensors can counteract the interference of the power frequency magnetic field of the tubular bus on the dielectric loss factor detection, so that the capability of the detection device for resisting electromagnetic field interference is improved. The following is an exemplary description of a tubular busbar intelligent detection device provided in an embodiment of the present disclosure with reference to fig. 1 to 2.
Fig. 1 is an installation schematic diagram of a tubular busbar intelligent detection device provided by an embodiment of the disclosure, and fig. 2 is a structural schematic diagram of a tubular busbar intelligent detection device provided by an embodiment of the disclosure. With reference to fig. 1 and 2, the tubular busbar intelligent detection device includes: a fixed support 3, a temperature detection device, a leakage current detection device and a dielectric loss detection device; the fixed support 3 is arranged on the tubular busbar connecting device 2, and the temperature detection device, the leakage current detection device and the dielectric loss detection device are all arranged on the fixed support 3; the temperature measuring probe of the temperature detecting device is contacted with the outer wall of the tubular bus and used for detecting the surface temperature of the tubular bus in real time; the leakage current detection device is connected with the shielding layer grounding wire of the tubular bus and is used for detecting the leakage current of the tubular bus in real time; the dielectric loss detection device is connected with the shielding layer grounding wire of the tubular bus and the secondary side of the bus voltage transformer of the tubular bus and is used for detecting the dielectric loss factor of the tubular bus in real time.
Wherein the connection device 2 can connect the tubular bus bars 1.
The embodiment of the disclosure is to install a temperature detection device, a leakage current detection device and a dielectric loss detection device on the fixed support 3 by arranging the fixed support 3 on the connecting device 2, and detect the surface temperature, the leakage current and the dielectric loss factor of the tubular busbar 1 in real time. Therefore, the reliable and stable real-time detection of the performance of the tubular bus can be realized, and the operation safety of the tubular bus is improved.
In one embodiment, the temperature detection device comprises a temperature sensor 4 and a temperature data processing unit; the temperature measuring probe of the temperature sensor 4 is in contact with the outer wall of the tubular busbar 1 and is used for detecting the surface temperature of the tubular busbar and transmitting the detected temperature to the temperature data processing unit. The temperature data processing unit may be disposed in the background monitoring system 9, which may be disposed on site or at a remote location, for example, but the embodiment of the present disclosure is not limited thereto.
The temperature data processing unit, for example, comprises a memory and a processor, the memory storing a computer program executable by the processor to perform the following calculations:
T＝4e T1/T0 +T1；
wherein T is the temperature of an inner conductor of the tubular busbar; t1 is the surface temperature of the tubular busbar; t0 is the ambient temperature.
Therefore, the surface temperature of the tubular bus is detected, the inner conductor temperature of the tubular bus can be obtained based on the surface temperature and the environment temperature, and the inner conductor temperature of the tubular bus is the temperature affecting the working performance of the tubular bus, so that the working performance of the tubular bus can be accurately detected.
Specifically, due to insulation fit, it is difficult to directly measure the conductor temperature on the high-voltage conductor due to the real temperature of the inner conductor of the tubular busbar 1, the present disclosure obtains the inner conductor temperature of the tubular busbar 1 by measuring the surface temperature of the tubular busbar 1 and performing calculation compensation through the above formula, and installs the temperature sensor 4 on the fixing bracket of the tubular busbar 1, and the temperature sensor 4 is in close contact with the tubular busbar 1 to accurately measure the surface temperature, so that the present disclosure is safe, convenient to replace, and easy to maintain.
For example, the inner conductor temperature of the tubular busbar 1 can be calculated by the above formula by taking into consideration the heat dissipation conditions of the surface of the tubular busbar 1 by the thermal conductivity of the silicone rubber.
The present disclosure also experimentally verifies the above calculations. Specifically, the above formula was verified by applying different currents to the tubular busbar 1 so that the inner conductor of the tubular busbar exhibited different temperatures, and then measuring the actual temperature, and test data are shown in tables 1 and 2, respectively.
TABLE 1 test verification data for an environmental test temperature of 28℃
Figure BDA0002560553210000091
TABLE 2 test verification data for an environmental test temperature of 35℃
Figure BDA0002560553210000092
From the test verification data shown in the above tables 1 and 2, it can be seen that when the temperature of the inner conductor of the tubular busbar 1 is measured in a calculation and compensation manner, the measurement error does not exceed ±3 ℃, so that the temperature of the inner conductor of the tubular busbar 1 can be measured without affecting the busbar insulation, thereby being beneficial to realizing the accurate detection of the online performance of the tubular busbar 1.
In one embodiment, the leakage current detection device includes a first leakage current sensor and a leakage current data processing unit, the first leakage current sensor is penetrated by the tubular bus bar shielding layer grounding wire 7, the tubular bus bar shielding layer grounding wire 7 is directly grounded after penetrating the first leakage current sensor, and the first leakage current sensor is used for measuring the transmission current of the shielding layer grounding wire 7, so as to obtain the leakage current.
In an embodiment, to make the measured leakage current data more accurate, the leakage current data processing unit may calculate the leakage current of the tubular busbar 1 according to the output data of the first leakage current sensor by using a root mean square method. For example, the leakage current data processing unit may be provided in a background monitoring system. Meanwhile, the leakage current data processing unit is connected with the background monitoring display equipment, and at least one of the detected value and the leakage current obtained after calculation can be reflected on the display equipment, so that the detection result can be conveniently and intuitively presented.
The leakage current data processing unit comprises a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to realize the following calculation:
Figure BDA0002560553210000101
wherein I is Leakage current For the calculated leakage current; i 1 The value acquired for the 1 st time of the first leakage current sensor; i 2 The value acquired for the 2 nd time of the first leakage current sensor; i n Is the value acquired for the nth time of the first leakage current sensor.
Therefore, through carrying out root mean square operation on a plurality of continuous leakage currents acquired by the first leakage current sensor, more accurate leakage current values within a period of duration can be obtained, and detection accuracy of the leakage currents is improved.
In one embodiment, the dielectric loss detection means may obtain the dielectric loss tangent and capacitance by processing the leakage current and bus voltage data.
Fig. 3 is a schematic structural diagram of another tubular busbar intelligent detection device according to an embodiment of the disclosure. Referring to fig. 2 and 3, in the tubular busbar intelligent detection device, the dielectric loss detection device may include a second leakage current sensor 5, a third leakage current sensor 6, a busbar voltage sensor 8, and a loss data processing unit; the second leakage current sensor 5 and the third leakage current sensor 6 are connected with a grounding wire 7 of a tubular bus shielding layer and are used for collecting leakage current of the tubular bus 1; the busbar voltage sensor 8 is connected to the secondary side of a busbar voltage transformer, for example, which is arranged on the terminal device of the tubular busbar for detecting the busbar voltage signal of the tubular busbar 1. The loss data processing unit is used for receiving the leakage current signal and the bus voltage signal and calculating the dielectric loss factor of the tubular bus 1 based on the leakage current signal and the bus voltage signal.
Illustratively, the lossy data processing unit comprises a memory and a processor, the memory having stored thereon a computer program executable by the processor to perform the following calculations:
Tanδ＝tan(a+b-c*2)；
wherein Tan delta is the dielectric loss tangent; a is the phase angle of the leakage current output by the second leakage current sensor; b is the leakage current phase angle output by the third leakage current sensor; c is the phase angle of the bus voltage.
Thus, the dielectric loss factor can be obtained from the leakage current and the bus voltage.
In an embodiment, in order to make the calculated dielectric loss factor more accurate, the above mode of calculating the root mean square may be adopted to obtain the leakage current and the bus voltage in the same duration period, and then calculate the dielectric loss factor according to the leakage current and the bus voltage, so as to obtain a more accurate detection result of the dielectric loss factor.
In an embodiment, the first leakage current sensor can detect leakage current by adopting a zero-flux leakage current sensor, so that the measurement accuracy is high, and accurate judgment of the operation performance of the tubular bus is facilitated.
In one embodiment, the second and third leakage current sensors 5, 6 comprise a pair of reverse wired through-zero flux current sensors, with the tubular busbar shield ground wire 7 passing forward through the first leakage current sensor's through-hole, then back through the second leakage current sensor 5's through-hole, and then to ground.
Therefore, the interference of the power frequency magnetic field of the tubular busbar 1 on the dielectric loss factor detection is counteracted by adopting the pair of current sensors with reverse wiring, so that the measurement data is more accurate.
In an embodiment, the second leakage current sensor and the first leakage current sensor may be the same component, i.e. the same current sensor may be used for both.
The arrangement is beneficial to simplifying the whole structure of the tubular bus intelligent detection device, reducing the lifting weight and the cost thereof, and is beneficial to realizing the miniaturization design thereof.
In other embodiments, the second leakage current sensor and the first leakage circuit sensor may also use different current sensors, which may be set according to the requirements of the tubular busbar intelligent detection device, and the embodiment of the disclosure is not limited thereto.
In one embodiment, the tubular bus intelligent detection device may further comprise a capacitance data processing unit to obtain bus capacitance based on leakage current and bus voltage. By way of example, the capacitance data processing unit may comprise a memory and a processor, the memory having stored thereon a computer program that, when executed by the processor, performs the following calculations:
Figure BDA0002560553210000121
wherein C is the capacitance of the tubular bus, I1 is the effective value of the leakage current of the second leakage current sensor, I2 is the effective value of the leakage current of the third leakage current sensor, f is the frequency of the bus voltage, a is the phase angle of the leakage current output by the second leakage current sensor, b is the phase angle of the leakage current output by the third leakage current sensor, C is the phase angle of the bus voltage, and U is the effective value of the bus voltage.
Thus, the bus capacitance can be obtained from the leakage current and the bus voltage.
In the above embodiments, the loss data processing unit, the capacitance data processing unit, the temperature data processing unit, and the leakage current data processing unit may be provided on site or may be provided at a remote end.
By way of example, the loss data processing unit, the capacitance data processing unit, the temperature data processing unit and the leakage current data processing unit may be integrated on the same processing chip, which may be provided on the stationary support 3. At the same time, the sensors of the present disclosure may be mounted on a stationary base.
For example, the application process of the intelligent detection device for the tubular bus can be as follows:
1) The intelligent detection device of the tubular bus is arranged on the connection device 2 of the tubular bus, and all the detection devices start to work;
2) The temperature detection device acquires the temperature of the outer wall of the tubular busbar 1 in real time, namely the surface temperature of the tubular busbar is obtained, the surface temperature is transmitted to the temperature data processing unit for calculation, and data before and after processing can be transmitted to the background server;
3) The leakage current detection device and the dielectric loss detection device synchronously sample leakage current and bus voltage signals of the tube-type bus 1; calculating leakage current, capacitance and dielectric loss factor of the pipe bus according to the sampled leakage current and bus voltage signals; the tubular bus intelligent detection device can transmit leakage current, capacitance and dielectric loss factor of the tubular bus to a background server through a communication cable or other signal transmission modes;
4) The background server can store, display and compare and analyze the received detection data.
Based on the same inventive concept, the embodiment of the disclosure also provides a tubular busbar intelligent detection method, which can be executed by any tubular busbar intelligent detection device provided by the embodiment. Therefore, the intelligent detection method for the tubular bus has the technical effects of the intelligent detection device for the tubular bus, and the same points can be understood by referring to the explanation of the intelligent detection device for the tubular bus, and the explanation is omitted hereinafter.
Fig. 4 is a schematic flow chart of a tubular busbar intelligent detection method according to an embodiment of the disclosure. Referring to fig. 4, the method may include:
s41, acquiring the surface temperature of the tubular bus by a temperature detection device, acquiring the leakage current of the tubular bus by a leakage current detection device, and acquiring the leakage current and the bus voltage of the tubular bus by a dielectric loss detection device.
And S42, the processor determines the inner conductor temperature of the tubular bus based on the surface temperature and the environment temperature of the tubular bus acquired by the temperature detection device.
And S43, the processor determines the leakage current of the tubular bus based on the single leakage current of the tubular bus, which is obtained by the leakage current detection device and is obtained for N times in succession.
And S44, the processor determines the dielectric loss factor of the tubular bus based on the leakage current and the bus voltage of the tubular bus obtained by the dielectric loss detection device.
So, can carry out intelligent on-line measuring to tubular busbar, carry out real-time detection in tubular busbar operation promptly, specifically contain: 1) Detecting the conductor temperature rise of the tubular bus on line; 2) Detecting leakage current of a shielding layer of the tubular bus on line; 3) The dielectric loss and the capacitance of the insulating material of the tubular bus are detected on line, so that the reliability and the stability of the tubular bus are detected, and the operation safety of the tubular bus is improved.
It should be noted that, in fig. 4, S42, S43, and S44 are only shown to be executed sequentially in the sequence, and in other embodiments, the execution sequence of S42, S43, and S44 may be other sequences, that is, the calculation sequence of the operation parameters of the tubular bus is not limited in the disclosure, and may be set according to the requirements of the device and method for intelligent detection of the tubular bus.
Optionally, the temperature detecting device includes a temperature sensor, the leakage current detecting device includes a first leakage current sensor, and the dielectric loss detecting device includes a bus voltage sensor, a second leakage current sensor, and a third leakage current sensor.
Based on this:
s42 may include: the inner conductor temperature was calculated using the following:
T＝4e T1/T0 +T1，
wherein T is the temperature of an inner conductor of the tubular busbar; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is the ambient temperature.
Therefore, the temperature of the inner conductor of the tubular bus can be accurately determined, and the operation performance of the tubular bus can be accurately detected.
S43 may include: leakage current was calculated using the following:
Figure BDA0002560553210000141
wherein I is Leakage current Is leakage current; i 1 The value acquired for the 1 st time of the first leakage current sensor; i 2 The value acquired for the 2 nd time of the first leakage current sensor; i n Is the value acquired for the nth time of the first leakage current sensor.
Thus, a more accurate leakage current value can be obtained, and the accurate judgment of the operation performance of the tubular bus is realized.
S44 may include: the dielectric loss tangent was calculated using the following:
Tanδ＝tan(a+b-c×2)，
wherein Tan delta is the dielectric loss tangent; a is the phase angle of the leakage current output by the second leakage current sensor; b is the leakage current phase angle output by the third leakage current sensor; c is the phase angle of the bus voltage output by the bus voltage sensor.
Thus, the dielectric loss tangent of the tubular bus bar can be obtained.
Optionally, the method further includes calculating the capacitance of the bus bar, and specifically the step may include: the capacitance of the tubular busbar was calculated using the following:
Figure BDA0002560553210000151
wherein C is the capacitance of the tubular bus, I1 is the leakage current effective value of the second leakage current sensor, I2 is the leakage current effective value of the third leakage current sensor, f is the bus voltage frequency, a is the leakage current phase angle output by the second leakage current sensor, b is the leakage current phase angle output by the third leakage current sensor, C is the phase angle of the bus voltage, and U is the bus voltage effective value.
Thus, the capacitance of the tubular bus bar can be obtained.
Therefore, the intelligent detection method for the tubular bus can realize real-time online intelligent detection of the operating parameters such as the temperature of the inner conductor, leakage current, medium damage factor, capacitance and the like of the tubular bus, and is convenient for monitoring the operating performance of the tubular bus in real time, thereby ensuring higher operating safety of the tubular bus.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The intelligent detection device for the tubular bus is characterized by comprising a fixed support, a temperature detection device, a leakage current detection device and a dielectric loss detection device;
the fixed support is arranged on the connecting device of the tubular bus, and the temperature detection device, the leakage current detection device and the dielectric loss detection device are arranged on the fixed support;
the temperature measuring probe of the temperature detecting device is contacted with the outer wall of the tubular bus and is used for detecting the surface temperature of the tubular bus in real time;
the leakage current detection device is connected with the shielding layer grounding wire of the tubular bus and is used for detecting the leakage current of the tubular bus in real time;
the dielectric loss detection device is connected with a shielding layer grounding wire of the tubular bus and a secondary side of a bus voltage transformer of the tubular bus and is used for detecting the dielectric loss factor of the tubular bus in real time;
the leakage current detection device comprises a first leakage current sensor, wherein the first leakage current sensor is connected with a shielding layer grounding wire of the tubular bus;
the dielectric loss detection device comprises a bus voltage sensor, a second leakage current sensor, a third leakage current sensor and a loss data processing unit;
the second leakage current sensor and the third leakage current sensor are a pair of through zero-flux current sensors with reverse wiring, are respectively connected with a shielding layer grounding wire of the tubular bus and are used for collecting leakage current of the tubular bus; the bus voltage sensor is connected with the secondary side of the bus voltage transformer of the tubular bus and is used for collecting bus voltage signals of the tubular bus;
the loss data processing unit is used for determining a dielectric loss factor of the tubular bus according to the leakage current acquired by the second leakage current sensor and the third leakage current sensor and the bus voltage signal acquired by the bus voltage sensor;
the first leakage current sensor and the second leakage current sensor are the same component;
the processor determining the inner conductor temperature of the tubular busbar based on the surface temperature and the ambient temperature of the tubular busbar acquired by the temperature detection device comprises:
the inner conductor temperature is calculated using the formula:
Figure FDA0004182322200000021
wherein T is the temperature of an inner conductor of the tubular busbar; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is the ambient temperature;
the processor determining the dielectric loss tangent of the tubular bus based on the leakage current and the bus voltage of the tubular bus obtained by the dielectric loss detection device comprises:
the dielectric loss tangent is calculated using the formula:
Tanδ＝tan(a+b-c×2)
wherein Tan delta is the dielectric loss tangent; a is the leakage current phase angle output by the second leakage current sensor; b is the leakage current phase angle output by the third leakage current sensor; c is the phase angle of the bus voltage output by the bus voltage sensor.
2. The intelligent detection device for the tubular bus bar according to claim 1, wherein the temperature detection device comprises a temperature sensor, and a temperature measurement probe of the temperature sensor is in contact with the outer wall of the tubular bus bar.
3. The tubular busbar intelligent detection device of claim 1, wherein the first leakage current sensor is a zero flux leakage current sensor.
4. The intelligent detection method for the tubular bus is characterized by being implemented by using an intelligent detection device for the tubular bus, wherein the intelligent detection device for the tubular bus comprises a temperature detection device, a leakage current detection device, a dielectric loss detection device and a processor; the method comprises the following steps:
the method comprises the steps that a temperature detection device obtains the surface temperature of a tubular bus, a leakage current detection device obtains the leakage current of the tubular bus, and a dielectric loss detection device obtains the leakage current and the bus voltage of the tubular bus;
the processor determines the inner conductor temperature of the tubular bus based on the surface temperature and the environment temperature of the tubular bus obtained by the temperature detection device;
the processor determines the leakage current of the tubular bus based on the single leakage current of the tubular bus, which is obtained by the leakage current detection device and is continuous for N times;
the processor determines the dielectric loss factor of the tubular bus based on the leakage current and the bus voltage of the tubular bus obtained by the dielectric loss detection device;
the leakage current detection device comprises a first leakage current sensor, wherein the first leakage current sensor is connected with a shielding layer grounding wire of the tubular bus;
the dielectric loss detection device comprises a bus voltage sensor, a second leakage current sensor, a third leakage current sensor and a loss data processing unit;
the second leakage current sensor and the third leakage current sensor are a pair of through zero-flux current sensors with reverse wiring, are respectively connected with a shielding layer grounding wire of the tubular bus and are used for collecting leakage current of the tubular bus; the bus voltage sensor is connected with the secondary side of the bus voltage transformer of the tubular bus and is used for collecting bus voltage signals of the tubular bus;
the loss data processing unit is used for determining a dielectric loss factor of the tubular bus according to the leakage current acquired by the second leakage current sensor and the third leakage current sensor and the bus voltage signal acquired by the bus voltage sensor;
the first leakage current sensor and the second leakage current sensor are the same component;
the processor determining the inner conductor temperature of the tubular busbar based on the surface temperature and the ambient temperature of the tubular busbar acquired by the temperature detection device comprises:
the inner conductor temperature is calculated using the formula:
Figure FDA0004182322200000031
wherein T is the temperature of an inner conductor of the tubular busbar; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is the ambient temperature;
the processor determining the dielectric loss tangent of the tubular bus based on the leakage current and the bus voltage of the tubular bus obtained by the dielectric loss detection device comprises:
the dielectric loss tangent is calculated using the formula:
Tanδ＝tan(a+b-c×2)
wherein Tan delta is the dielectric loss tangent; a is the leakage current phase angle output by the second leakage current sensor; b is the leakage current phase angle output by the third leakage current sensor; c is the phase angle of the bus voltage output by the bus voltage sensor.
5. The intelligent detection method for tubular bus bar according to claim 4, wherein the temperature detection device comprises a temperature sensor, the leakage current detection device comprises a first leakage current sensor, and the dielectric loss detection device comprises a bus bar voltage sensor, a second leakage current sensor and a third leakage current sensor;
the processor determining the leakage current of the tubular bus based on the single leakage current of the tubular bus for N consecutive times acquired by the leakage current detection device includes:
the leakage current was calculated using the following formula:
Figure FDA0004182322200000041
in the method, in the process of the invention,
Figure FDA0004182322200000043
is leakage current; i 1 A value acquired for the 1 st time of the first leakage current sensor; i 2 A value for the 2 nd acquisition of the first leakage current sensor; i n The value acquired for the nth time of the first leakage current sensor.
6. The intelligent detection method for tubular bus bars according to claim 5, further comprising the steps of:
the capacitance of the tubular busbar was calculated using the following:
Figure FDA0004182322200000042
wherein C is the capacitance of the tubular bus, I1 is the leakage current effective value of the second leakage current sensor, I2 is the leakage current effective value of the third leakage current sensor, f is the bus voltage frequency, a is the leakage current phase angle output by the second leakage current sensor, b is the leakage current phase angle output by the third leakage current sensor, C is the phase angle of the bus voltage, and U is the bus voltage effective value.
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