CN111913127A - 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
CN111913127A
CN111913127A CN202010609682.1A CN202010609682A CN111913127A CN 111913127 A CN111913127 A CN 111913127A CN 202010609682 A CN202010609682 A CN 202010609682A CN 111913127 A CN111913127 A CN 111913127A
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leakage current
detection device
bus
tubular
tubular bus
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CN111913127B (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

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present disclosure relates to a tubular bus intelligent detection device and method, the device includes: 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 all arranged on the fixed support; a temperature measuring probe of the temperature detecting device is in contact 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 a 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 grounding of the shielding layer of the tubular bus and connected with the secondary side of the bus voltage transformer of the tubular bus and used for detecting the dielectric loss factor of the tubular bus in real time. The embodiment of the disclosure can detect the insulating property of the tubular bus in the operation process, and can solve the problem that the safe operation of the tubular bus cannot be guaranteed.

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 detection device and method for a tubular busbar.
Background
At present, a solid insulated tubular bus is used as a large current transmission device and is gradually and widely applied to a transformer substation and a power transmission and transformation line, the solid insulated bus is used as a main carrier of power transmission, and detection in the installation and use process of the solid insulated tubular bus is extremely necessary.
However, the detection of the tubular busbar currently remains only: 1) in the project construction stage, the acceptance test before the equipment is put into operation is carried out, and the test projects comprise a power frequency tolerance test, dielectric loss detection, appearance inspection after the installation, and the like; 2) the tubular busbar is preventively tested each year or each year during operation. However, the above detection method is very inconvenient and has an influence on the production or operation on the site; meanwhile, the detection hand only stays at a partial stage and cannot be used for judging the reliability and the stability of the insulating property of the tubular bus, so that the safe operation of the tubular bus cannot be guaranteed.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides an intelligent detection apparatus and method for a tubular bus, so as to achieve reliable and stable detection of insulation performance of the tubular bus in an operation process, and improve a problem that safe operation of the tubular bus cannot be guaranteed.
The invention provides an intelligent detection device for a tubular bus, 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 all arranged on the fixed support;
the temperature measuring probe of the temperature detecting device is in contact 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 a shielding layer grounding wire of the tubular bus and is used for detecting the leakage current of the tubular bus in real time;
the medium loss detection device is connected with the grounding wire of the shielding layer of the tubular bus and connected with the secondary side of the bus voltage transformer of the tubular bus, and is used for detecting the medium loss factor of the tubular bus in real time.
Optionally, the temperature detection device includes a temperature sensor, and a temperature probe of the temperature sensor is in contact with the outer wall of the tubular bus.
Optionally, the leakage current detection device includes a first leakage current sensor, and the first leakage current sensor is connected to the shielding layer of the tubular bus in a ground connection manner.
Optionally, the dielectric loss detection device includes 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 reverse wiring through zero-flux current sensors, are respectively connected with the shielding layer grounding wire of the tubular bus and are used for collecting the leakage current of the tubular bus; the bus voltage sensor is connected with the secondary side of a bus voltage transformer of the tubular bus and used for acquiring a bus voltage signal 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 acquired by the second leakage current sensor and the third leakage current sensor and the bus voltage signal acquired 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 intelligent detection method is implemented by applying an 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 temperature detection device acquires the surface temperature of the tubular bus, the leakage current detection device acquires the leakage current of the tubular bus, and the dielectric loss detection device acquires the leakage current and the bus voltage of the tubular bus;
the processor determines the temperature of the inner conductor of the tubular bus based on the surface temperature and the environment temperature of the tubular bus acquired 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 obtained by the leakage current detection device 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 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 determines the temperature of the inner conductor of the tubular bus based on the surface temperature and the environment temperature of the tubular bus acquired by the temperature detection device, and comprises the following steps:
calculating the inner conductor temperature using:
T＝4eT1/T0+T1，
in the formula, T is the temperature of an inner conductor of the tubular bus; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is ambient temperature;
the processor determines the leakage current of the tubular bus based on the single leakage current of the tubular bus acquired by the leakage current detection device for N times, wherein the processor comprises the following steps:
calculating the leakage current using:
Figure BDA0002560553210000031
in the formula ILeakage currentIs leakage current; i is1Is the first leakage current sensorThe value collected at the 1 st time; i is2The value of the 2 nd acquisition of the first leakage current sensor is obtained; i isnThe value acquired by the first leakage current sensor for the nth time is obtained;
the processor determines the dielectric loss factor of the tubular bus based on the leakage current and the bus voltage of the tubular bus acquired by the dielectric loss detection device, and comprises the following steps:
calculating the dielectric loss factor using the formula:
Tan＝tan(a+b-c×2)，
wherein Tan is the dielectric loss factor; a is a leakage current phase angle output by the second leakage current sensor; b is a 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 following steps:
calculating the capacitance of the tubular busbar using the following equation:
Figure BDA0002560553210000041
where 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 bus voltage frequency, 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.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: the utility model provides a tubular busbar intellectual detection system device, through fixing temperature-detecting device, leakage current detection device and dielectric loss detection device in the connecting device position department of tubular busbar through fixing support, can carry out intelligent on-line measuring to temperature, leakage current and the dielectric loss of tubular busbar in real time, can judge the reliability and the stability of tubular busbar insulating properties in real time, improved the operation security of tubular busbar.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is an installation schematic diagram of a tubular bus intelligent detection device provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an intelligent detection device for a tubular bus according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another intelligent detection device for a tubular bus according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of an intelligent detection method for a tubular bus according to an embodiment of the present 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, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
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 in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments. The various embodiments of the disclosure, generally described and illustrated in the figures herein, may be combined with each other, and the structural components or functional blocks thereof may be arranged and designed in a variety of different configurations, without conflict. Thus, the following detailed description of the embodiments of the present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present 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 orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the disclosed products are conventionally placed in use, and are only for convenience in describing and simplifying the present disclosure, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Moreover, 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the 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 otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
The tubular busbar (hereinafter may be referred to as "tubular busbar") intelligent detection device that this disclosed embodiment provided can carry out intelligent on-line measuring to tubular busbar, carries out real-time detection promptly in tubular busbar is put into operation, specifically contains: 1) detecting the conductor temperature rise of the tubular bus on line; 2) detecting the 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.
Furthermore, a data processing unit is arranged in the temperature detection device of the bus intelligent detection device, and can compensate the measured temperature of the tubular bus, so that the detected temperature data is more accurate; in the bus intelligent detection device, the leakage current detection device adopts a zero magnetic flux leakage current sensor to detect leakage current, and the measurement precision is higher; in the bus intelligent detection device, a pair of through zero-flux current sensors in reverse wiring is adopted to detect the dielectric loss factor, and the interference of a power frequency magnetic field of the tubular bus on the detection of the dielectric loss factor can be counteracted by adopting the pair of current sensors, so that the capability of the detection device for resisting the electromagnetic field interference is improved. The tubular bus intelligent detection device provided by the embodiment of the disclosure is exemplarily described below with reference to fig. 1 to 2.
Fig. 1 is an installation schematic diagram of an intelligent detection device for a tubular bus according to an embodiment of the present disclosure, and fig. 2 is a structural schematic diagram of the intelligent detection device for a tubular bus according to an embodiment of the present disclosure. With reference to fig. 1 and 2, the intelligent detecting device for tubular bus comprises: the device comprises 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 bus 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; a temperature measuring probe of the temperature detecting device is in contact 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 a 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 grounding of the shielding layer of the tubular bus and connected with the secondary side of the bus voltage transformer of the tubular bus and used for detecting the dielectric loss factor of the tubular bus in real time.
Wherein the connecting device 2 can connect the tubular busbar 1.
The fixing support 3 is arranged on the connecting device 2, the temperature detection device, the leakage current detection device and the dielectric loss detection device are all arranged on the fixing support 3, and the surface temperature, the leakage current and the dielectric loss factor of the tubular bus 1 are detected in real time. Therefore, the reliability and the stability of the performance of the tubular busbar can be detected in real time, and the operation safety of the tubular busbar can be improved.
In one embodiment, the temperature detection means 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 bus 1 and is used for detecting the surface temperature of the tubular bus and transmitting the detected temperature to the temperature data processing unit. For example, the temperature data processing unit may be disposed in the background monitoring system 9, and the background monitoring system may be disposed on the spot or at a remote end, which is not limited in this disclosure.
Illustratively, the temperature data processing unit includes a memory and a processor, the memory having stored therein a computer program, the computer program being executable by the processor to perform the following calculations:
T＝4eT1/T0+T1；
in the formula, T is the temperature of an inner conductor of the tubular bus; t1 is the surface temperature of the tubular busbar; t0 is 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 which influences the working performance of the tubular bus, so that the more accurate detection of the working performance of the tubular bus can be realized.
Specifically, the real temperature of tubular busbar 1's inner conductor is because insulating complex's reason, is difficult to direct measurement conductor temperature on the high voltage conductor, this disclosure through measuring tubular busbar 1's surface temperature, calculate the compensation through above-mentioned formula and obtain tubular busbar 1's inner conductor temperature to install temperature sensor 4 on tubular busbar 1 fixed bolster, temperature sensor 4 and tubular busbar 1 in close contact with accurate measurement surface temperature, safety and change convenience, easy maintenance.
For example, the temperature of the inner conductor of the tubular busbar 1 can be calculated by the formula according to the heat conduction coefficient of silicon rubber and the working condition of taking the surface heat dissipation of the tubular busbar 1 into consideration.
The present disclosure also performs experimental verification on the above calculations. Specifically, different currents are applied to the tubular busbar 1, so that the inner conductor of the tubular busbar presents different temperatures, the actual temperature is measured, the above formula is verified, and the test data are respectively shown in table 1 and table 2.
TABLE 1 test validation data for a test environment temperature of 28 deg.C
Figure BDA0002560553210000091
TABLE 2 test validation data for a test environment temperature of 35 deg.C
Figure BDA0002560553210000092
As can be seen from the test verification data shown in the tables 1 and 2, when the temperature of the inner conductor of the tubular bus 1 is measured in a calculation compensation mode, the measurement error is not more than +/-3 ℃, so that the temperature of the inner conductor of the tubular bus 1 can be measured under the condition that the bus insulation is not influenced, and the accurate detection of the online performance of the tubular bus 1 is facilitated.
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 busbar shielding layer ground wire 7, the tubular busbar shielding layer ground wire 7 is directly grounded after penetrating through the first leakage current sensor, and the first leakage current sensor is used for measuring the transmission current of the shielding layer ground wire 7, so as to obtain the leakage current.
In an embodiment, in order to make the measured data of the leakage current more accurate, the leakage current data processing unit may calculate the leakage current of the tubular bus 1 by using a root mean square method according to the output data of the first leakage current sensor. For example, the leakage current data processing unit may be disposed in the background monitoring system. Meanwhile, the leakage current data processing unit is connected with the background monitoring display device, and at least one of the detection value and the calculated leakage current can be embodied on the display device, so that the detection result can be conveniently and visually presented.
Illustratively, the leakage current data processing unit includes a memory and a processor, the memory has a computer program stored thereon, the computer program is executed by the processor, and the following calculation can be realized:
Figure BDA0002560553210000101
in the formula ILeakage currentIs the calculated leakage current; i is1The value is acquired by the first leakage current sensor at the 1 st time; i is2The value of the 2 nd acquisition of the first leakage current sensor is obtained; i isnThe value acquired for the nth time of the first leakage current sensor.
Therefore, a plurality of continuous leakage currents collected by the first leakage current sensor are subjected to root mean square operation, so that a more accurate leakage current value within a period of duration can be obtained, and the detection accuracy of the leakage current is improved.
In one embodiment, the dielectric loss sensing device can obtain the dielectric loss factor and the capacitance by processing the leakage current and the bus voltage data.
Exemplarily, fig. 3 is a schematic structural diagram of another tubular bus intelligent detection device provided in the embodiment of the present disclosure. With reference to fig. 2 and 3, in the tubular bus intelligent detection device, the dielectric loss detection device may include a second leakage current sensor 5, a third leakage current sensor 6, a bus voltage sensor 8 and a loss data processing unit; the second leakage current sensor 5 and the third leakage current sensor 6 are both connected with a tubular bus shielding layer grounding wire 7 and are used for collecting leakage current of the tubular bus 1; the bus voltage sensor 8 is connected with the secondary side of a bus voltage transformer, for example, the bus voltage transformer is arranged on terminal equipment of the tubular bus and is used for collecting bus voltage signals of the tubular bus 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 wear data processing unit includes a memory and a processor, the memory having stored thereon a computer program that is executed by the processor and that implements the following calculations:
Tan＝tan(a+b-c*2)；
wherein Tan is the dielectric loss factor; a is a leakage current phase angle output by the second leakage current sensor; b is a 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 according to the leakage current and the bus voltage.
In an embodiment, in order to make the calculated dielectric loss factor more accurate, the leakage current and the bus voltage in the same duration time period can be obtained first by adopting the above manner of calculating the root mean square, and then the dielectric loss factor is calculated according to the leakage current and the bus voltage, so that a more accurate detection result of the dielectric loss factor is obtained.
In an embodiment, the first leakage current sensor can adopt a zero-magnetic-flux leakage current sensor to detect leakage current, so that the measurement precision is high, and accurate judgment on the operation performance of the tubular bus is facilitated.
In one embodiment, the second and third leakage current sensors 5 and 6 comprise a pair of reverse wired through-center zero-flux current sensors, and the tubular busbar shielding layer ground 7 passes forward through the through-hole of the first leakage current sensor, then backward through the through-hole of the second leakage current sensor 5, and then to ground.
Therefore, the interference of the power frequency magnetic field of the tubular bus 1 on the detection of the dielectric loss factor can be offset by adopting the pair of current sensors with reverse wiring, so that the measured data is more accurate.
In one 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.
So set up, be favorable to simplifying this cast generating line intellectual detection system device's overall structure, reduce the elevating capacity, reduce its cost, and be favorable to realizing its miniaturized design.
In other embodiments, the second leakage current sensor and the first leakage circuit sensor may also adopt different current sensors, and may be set according to the requirements of the tubular bus intelligent detection device, which is not limited in the embodiments of the present disclosure.
In one embodiment, the intelligent detection device for the tubular bus can further comprise a capacitance data processing unit, so that bus capacitance can be obtained based on the leakage current and the bus voltage. Illustratively, the capacitance data processing unit may comprise a memory and a processor, the memory having stored thereon a computer program that is executable by the processor to perform the following calculations:
Figure BDA0002560553210000121
where 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 bus voltage frequency, 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 according to 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 installed in the field or may be installed at a remote location.
For 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 disposed on the stationary support 3. Meanwhile, the sensors of the present disclosure may be mounted on a fixed base.
Illustratively, the application process of the tubular busbar intelligent detection device of the present disclosure may be as follows:
1) installing the intelligent detection device of the tubular bus on the connecting device 2 of the tubular bus, and starting the operation of each detection device;
2) the temperature detection device collects the temperature of the outer wall of the tubular bus 1 in real time to obtain the surface temperature of the tubular bus, the surface temperature is transmitted to the temperature data processing unit for calculation, and then the data before and after the 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 tubular bus 1; calculating the leakage current, the capacitance and the dielectric loss factor of the tube bus according to the sampled leakage current and the bus voltage signal; then, the intelligent detection device of the tubular bus can transmit the leakage current, the capacitance and the 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 present disclosure further provides an intelligent detection method for a tubular bus, which can be executed by any one of the intelligent detection devices for a tubular bus provided in the foregoing embodiments. Therefore, the intelligent detection method for the tubular bus also 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 in the foregoing description, and are not repeated in the following description.
Exemplarily, fig. 4 is a schematic flow chart of an intelligent detection method for a tubular bus according to an embodiment of the present disclosure. Referring to fig. 4, the method may include:
s41, the temperature detection device obtains the surface temperature of the tubular bus, the leakage current detection device obtains the leakage current of the tubular bus, and the dielectric loss detection device obtains the leakage current and the bus voltage of the tubular bus.
And S42, the processor determines the temperature of the inner conductor 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 acquired by the leakage current detection device for N times.
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 acquired by the dielectric loss detection device.
So, can carry out intelligent on-line measuring to the tubular busbar, carry out real-time detection promptly in the tubular busbar is put into operation, specifically contain: 1) detecting the conductor temperature rise of the tubular bus on line; 2) detecting the 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 fig. 4 only exemplarily shows that S42, S43, and S44 are sequentially executed according to a sequence, and in other embodiments, the execution sequence of S42, S43, and S44 may also be other sequences, that is, the calculation sequence of the operation parameters of the tubular bus is not limited in the present disclosure, and may be set according to the requirements of the intelligent detection apparatus and method for the tubular bus.
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.
Based on this:
s42 may include: the inner conductor temperature is calculated using the following equation:
T＝4eT1/T0+T1，
in the formula, T is the temperature of an inner conductor of the tubular bus; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is ambient temperature.
Therefore, the temperature of the inner conductor of the tubular bus can be accurately determined, and the running performance of the tubular bus can be accurately detected.
S43 may include: the leakage current is calculated using the following equation:
Figure BDA0002560553210000141
in the formula ILeakage currentIs leakage current; i is1The value is acquired by the first leakage current sensor at the 1 st time; i is2The value of the 2 nd acquisition of the first leakage current sensor is obtained; i isnThe value acquired for the nth time of the first leakage current sensor.
Therefore, a more accurate leakage current value can be obtained, and accurate judgment on the running performance of the tubular bus can be realized.
S44 may include: the dielectric loss factor was calculated using the following equation:
Tan＝tan(a+b-c×2)，
wherein Tan is the dielectric loss factor; a is a leakage current phase angle output by the second leakage current sensor; b is a leakage current phase angle output by the third leakage current sensor; and c is the phase angle of the bus voltage output by the bus voltage sensor.
Thus, the dielectric loss factor of the tubular busbar can be obtained.
Optionally, the method further includes calculating the capacitance of the bus bar, and the specific steps may include: calculating the capacitance of the tubular busbar by using the following formula:
Figure BDA0002560553210000151
where 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 bus voltage frequency, 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 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, the leakage current, the medium damage factor, the capacitance and the like of the inner conductor of the tubular bus, is convenient for monitoring the operating performance of the tubular bus in real time, and ensures higher operating safety.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present 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 herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. An intelligent detection device for a 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 all arranged on the fixed support;
the temperature measuring probe of the temperature detecting device is in contact 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 a shielding layer grounding wire of the tubular bus and is used for detecting the leakage current of the tubular bus in real time;
the medium loss detection device is connected with the grounding wire of the shielding layer of the tubular bus and connected with the secondary side of the bus voltage transformer of the tubular bus, and is used for detecting the medium loss factor of the tubular bus in real time.
2. The tubular busbar intelligent detection device according to claim 1, wherein the temperature detection device comprises a temperature sensor, and a temperature probe of the temperature sensor is in contact with an outer wall of the tubular busbar.
3. The tubular busbar intelligent detection device according to claim 1, wherein the leakage current detection device comprises a first leakage current sensor, and the first leakage current sensor is connected to a shield layer ground of the tubular busbar.
4. The tubular bus intelligent detection device of claim 3, wherein 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 reverse wiring through zero-flux current sensors, are respectively connected with the shielding layer grounding wire of the tubular bus and are used for collecting the leakage current of the tubular bus; the bus voltage sensor is connected with the secondary side of a bus voltage transformer of the tubular bus and used for acquiring a bus voltage signal 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 acquired by the second leakage current sensor and the third leakage current sensor and the bus voltage signal acquired by the bus voltage sensor.
5. The tubular bus bar intelligent detection device according to claim 4, wherein the first leakage current sensor and the second leakage current sensor are the same component.
6. The tubular bus intelligent detection device of claim 3 or 4, wherein the first leakage current sensor is a zero-flux leakage current sensor.
7. The intelligent detection method of the tubular bus is characterized by being executed by using an intelligent detection device of the tubular bus, wherein the intelligent detection device of 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 temperature detection device acquires the surface temperature of the tubular bus, the leakage current detection device acquires the leakage current of the tubular bus, and the dielectric loss detection device acquires the leakage current and the bus voltage of the tubular bus;
the processor determines the temperature of the inner conductor of the tubular bus based on the surface temperature and the environment temperature of the tubular bus acquired 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 obtained by the leakage current detection device 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 acquired by the dielectric loss detection device.
8. The tubular bus intelligent detecting method according to claim 7, wherein the temperature detecting device comprises a temperature sensor, the leakage current detecting device comprises a first leakage current sensor, and the dielectric loss detecting device comprises a bus voltage sensor, a second leakage current sensor and a third leakage current sensor;
the processor determines the temperature of the inner conductor of the tubular bus based on the surface temperature and the environment temperature of the tubular bus acquired by the temperature detection device, and comprises the following steps:
calculating the inner conductor temperature using:
T＝4eT1/T0+T1，
in the formula, T is the temperature of an inner conductor of the tubular bus; t1 is the surface temperature of the tubular busbar detected by the temperature sensor; t0 is ambient temperature;
the processor determines the leakage current of the tubular bus based on the single leakage current of the tubular bus acquired by the leakage current detection device for N times, wherein the processor comprises the following steps:
calculating the leakage current using:
Figure FDA0002560553200000031
in the formula ILeakage currentIs leakage current; i is1The value of the first leakage current sensor collected at the 1 st time is obtained; i is2The value of the 2 nd acquisition of the first leakage current sensor is obtained; i isnThe value acquired by the first leakage current sensor for the nth time is obtained;
the processor determines the dielectric loss factor of the tubular bus based on the leakage current and the bus voltage of the tubular bus acquired by the dielectric loss detection device, and comprises the following steps:
calculating the dielectric loss factor using the formula:
Tan＝tan(a+b-c×2)，
wherein Tan is the dielectric loss factor; a is a leakage current phase angle output by the second leakage current sensor; b is a 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.
9. The tubular busbar intelligent detection method according to claim 8, further comprising the steps of:
calculating the capacitance of the tubular busbar using the following equation:
Figure FDA0002560553200000032
where 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 bus voltage frequency, 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.
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