CN111913127A - Intelligent detection device and method for tubular bus - Google Patents

Abstract

The present disclosure relates to an intelligent detection device and method for a tubular busbar. 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 connection device of the tubular busbar, and the temperature The detection device, the leakage current detection device and the dielectric loss detection device are installed on the fixed support; the temperature measurement probe of the temperature detection device is in contact with the outer wall of the tubular busbar, and is used to detect the surface temperature of the tubular busbar in real time; the leakage current detection device It is connected with the shielding layer grounding wire of the tubular busbar to detect the leakage current of the tubular busbar in real time; the dielectric loss detection device is connected with the shielding layer grounding wire of the tubular busbar and the secondary side of the busbar voltage transformer of the tubular busbar. Connection for real-time detection of the dielectric loss factor of the tubular bus. In the embodiment of the present disclosure, the insulation performance of the tubular busbar can be detected during the operation, and the problem that the safe operation of the tubular busbar cannot be guaranteed can be improved.

Description

Intelligent detection device and method for tubular busbar

technical field

The present disclosure relates to the technical field of tubular busbar detection, in particular to an intelligent detection device and method for tubular busbars.

Background technique

At present, solid insulated tubular busbars have been widely used in substations and power transmission and transformation lines as high-current transmission equipment. As the main carrier of power transmission, solid insulated busbars are extremely necessary during installation and use.

However, at present, the inspection of tubular busbars still only stays at: 1) the project construction stage, the acceptance test before the equipment is put into operation, the test items include power frequency tolerance test, dielectric loss inspection and visual inspection after installation; 2) A preventive test of the tubular busbar is carried out every year or every few years in operation. However, the above detection methods are very inconvenient and have an impact on on-site production or operation; at the same time, the above detection methods only stay in part of the stage, and cannot be used to judge the reliability and stability of the insulation performance of the tubular busbar, so as to ensure the safe operation of the tubular busbar. Not guaranteed.

public content

In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides an intelligent detection device and method for a tubular busbar, so as to realize the reliable and stable detection of the insulation performance of the tubular busbar during operation, improve the The problem that the safe operation of the tubular busbar cannot be guaranteed.

The present disclosure provides an intelligent detection device for a tubular busbar, which includes 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 connection device of the tubular busbar, and the temperature detection device, the leakage current detection device and the dielectric loss detection device are all installed on the fixed support;

The temperature measuring probe of the temperature detection device is in contact with the outer wall of the tubular bus bar, and is used for real-time detection of the surface temperature of the tubular bus bar;

The leakage current detection device is connected to the ground wire of the shielding layer of the tubular busbar, and is used for real-time detection of the leakage current of the tubular busbar;

The dielectric loss detection device is connected to the ground wire of the shielding layer of the tubular busbar and to the secondary side of the busbar voltage transformer of the tubular busbar for real-time detection of the dielectric loss factor of the tubular busbar.

Optionally, the temperature detection device includes a temperature sensor, and a temperature measuring probe of the temperature sensor is in contact with the outer wall of the tubular bus bar.

Optionally, the leakage current detection device includes a first leakage current sensor, and the first leakage current sensor is connected to the ground wire of the shielding layer of the tubular bus bar.

Optionally, the medium loss detection device includes 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 reverse-wired through-center zero-flux current sensors, which are respectively connected to the shielding layer grounding wire of the tubular bus bar, and are used for collecting tubular the leakage current of the busbar; the busbar voltage sensor is connected to the secondary side of the busbar voltage transformer of the tubular busbar, and is used to collect the busbar voltage signal of the tubular busbar;

The loss data processing unit is configured to determine the tube type 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 The dielectric loss factor of the busbar.

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 magnetic flux leakage current sensor.

The present disclosure also provides an intelligent detection method for a tubular busbar, which is performed by an intelligent detection device for a tubular busbar, wherein the intelligent detection device for a tubular busbar includes a temperature detection device, a leakage power detection device, a dielectric loss detection device and a processor; the The method includes the following steps:

The temperature detection device obtains the surface temperature of the tubular busbar, the leakage current detection device obtains the leakage current of the tubular busbar, and the dielectric loss detection device obtains the leakage current and the busbar voltage of the tubular busbar;

The processor determines the temperature of the inner conductor of the tubular bus bar based on the surface temperature and the ambient temperature of the tubular bus bar acquired by the temperature detection device;

The processor determines the leakage current of the tubular busbar based on the single leakage current of the tubular busbar for N consecutive times obtained by the leakage current detection device;

The processor determines a dielectric loss factor of the tubular bus bar based on the leakage current and bus voltage of the tubular bus bar 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 bus bar based on the surface temperature and the ambient temperature of the tubular bus bar acquired by the temperature detection device includes:

The inner conductor temperature is calculated using the following equation:

T=4e ^T1/T0 + T1,

In the formula, T is the inner conductor temperature 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 busbar based on the N consecutive single leakage currents of the tubular busbar obtained by the leakage current detection device includes:

The leakage current is calculated using the following equation:

In the formula, I _{leakage current} is the leakage current; I ₁ is the value collected by the first leakage current sensor for the first time; I _{2 is} the value collected by the first leakage current sensor for the second time; A value collected by the leakage current sensor for the nth time;

The processor determining the dielectric loss factor of the tubular bus based on the leakage current and bus voltage of the tubular bus acquired by the dielectric loss detection device includes:

Calculate the dielectric loss factor using the following equation:

Tanδ=tan(a+b-c×2),

Wherein, Tanδ is the dielectric loss factor; 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 bus bar output by the bus voltage sensor The phase angle of the voltage.

Optionally, the method further includes the following steps:

Calculate the capacitance of the tubular busbar using the following formula:

Among them, C is the capacitance of the tubular busbar, 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 busbar voltage frequency, and a is the second leakage current sensor. The output leakage current phase angle, b is the leakage current phase angle output by the third leakage current sensor, c is the bus voltage phase angle, and U is the bus voltage effective value.

Compared with the prior art, the technical solutions provided by the embodiments of the present disclosure have the following advantages: an intelligent detection device for a tubular busbar is provided. At the position of the connecting device of the tubular busbar, intelligent online detection of the temperature, leakage current and dielectric loss of the tubular busbar can be carried out in real time, and the reliability and stability of the insulation performance of the tubular busbar can be judged in real time, and the operation safety of the tubular busbar can be improved. .

Description of 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 technical solutions in the prior art, the accompanying drawings that are required to be used in the description of the embodiments or the prior art will be briefly introduced below. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

FIG. 1 is a schematic diagram of the installation of an intelligent detection device for a tubular busbar according to an embodiment of the present disclosure;

2 is a schematic structural diagram of an intelligent detection device for a tubular busbar according to an embodiment of the present disclosure;

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 flowchart of an intelligent detection method for a tubular busbar according to an embodiment of the present disclosure.

Among them: 1-tubular busbar, 2-tubular busbar connection device, 3-fixed support, 4-temperature sensor, 5-second leakage current sensor, 6-third leakage current sensor, 7-shield grounding wire, 8- Bus voltage sensor, 9- Background monitoring system.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments may be combined with each other under the condition of no conflict.

Many specific details are set forth in the following description to facilitate a full understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, and Not all examples. The various embodiments of the present disclosure generally described and illustrated in the drawings herein may be combined with each other without conflict, and the structural components or functional modules therein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the 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. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the disclosed product is usually placed in use, only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying References to devices or elements must have, be constructed, and operate in a particular orientation and are therefore not to be construed as limitations of the present disclosure. Furthermore, relational terms such as the terms "first," "second," "third," etc. are used only to distinguish one entity or operation from another, and do not necessarily require or imply that such entities or operations are There is no such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element. Furthermore, the terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood in specific situations.

The pipe-type busbar (hereinafter referred to as "pipe-type bus") intelligent detection device provided by the embodiment of the present disclosure can perform intelligent online detection on the pipe-type busbar, that is, perform real-time detection during the operation of the pipe-type busbar, which specifically includes: 1. ) On-line detection of the conductor temperature rise of the tubular busbar; 2) Online detection of the leakage current of the shielding layer of the tubular busbar; 3) Online detection of the dielectric loss and capacitance of the insulating material of the tubular busbar, so as to realize the reliability and stability of the tubular busbar It is helpful to improve the operation safety of the tubular busbar.

Further, the temperature detection device of the busbar intelligent detection device is provided with a data processing unit, which can compensate the measured temperature of the tubular busbar, so that the detected temperature data is more accurate; in the busbar intelligent detection device, the leakage current is detected. The device uses a zero-flux leakage current sensor to detect leakage current, and the measurement accuracy is high; in this busbar intelligent detection device, a pair of reverse-connected through-center zero-flux current sensors are used to detect the dielectric loss factor, and a The current sensor can offset the interference of the power frequency magnetic field of the tubular busbar to the detection of the dielectric loss factor, and improve the ability of the detection device to resist electromagnetic field interference. The following is an exemplary description of the tubular busbar intelligent detection device provided by the embodiment of the present disclosure with reference to FIGS. 1 to 2 .

FIG. 1 is a schematic diagram of the installation of an intelligent detection device for tubular busbars according to an embodiment of the present disclosure, and FIG. 2 is a schematic structural diagram of an intelligent detection device for tubular busbars according to an embodiment of the present disclosure. 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 connection device 2, and the temperature The detection device, the leakage current detection device and the dielectric loss detection device are all installed on the fixed support 3; the temperature measuring probe of the temperature detection device is in contact with the outer wall of the tubular busbar, and is used for real-time detection of the surface temperature of the tubular busbar; leakage current detection The device is connected to the ground wire of the shielding layer of the tubular busbar to detect the leakage current of the tubular busbar in real time; the dielectric loss detection device is connected to the grounding wire of the shielding layer of the tubular busbar and the secondary voltage transformer of the busbar voltage transformer of the tubular busbar Side connection for real-time detection of the dielectric loss factor of the tubular bus.

Wherein, the connecting device 2 can connect the tubular busbars 1 .

In the embodiment of the present disclosure, the fixed support 3 is arranged on the connection device 2, and the temperature detection device, the leakage current detection device and the dielectric loss detection device are all installed on the fixed support 3, and the surface of the tubular bus bar 1 is detected in real time. temperature, leakage current, and dielectric dissipation factor. Thereby, the reliable and stable real-time detection of the performance of the tubular busbar can be realized, thereby helping to improve the operation safety of the tubular busbar.

In one embodiment, the temperature detection device includes a temperature sensor 4 and a temperature data processing unit; wherein, the temperature measuring probe of the temperature sensor 4 is in contact with the outer wall of the tubular bus bar 1 for detecting the surface temperature of the tubular bus bar, and The detected temperature is transmitted to the temperature data processing unit. Exemplarily, the temperature data processing unit may be provided in the background monitoring system 9, and the background monitoring system may be provided on site or at a remote end, which is not limited in the embodiment of the present disclosure.

Exemplarily, the temperature data processing unit includes a memory and a processor, and a computer program is stored in the memory, and the computer program is executed by the processor to realize the following calculations:

T=4e ^T1/T0 +T1;

In the formula, T is the inner conductor temperature of the tubular busbar; T1 is the surface temperature of the tubular busbar; T0 is the ambient temperature.

Therefore, by detecting the surface temperature of the tubular busbar, the inner conductor temperature of the tubular busbar can be obtained based on the surface temperature and the ambient temperature, and the inner conductor temperature of the tubular busbar is the temperature that affects the working performance of the tubular busbar, thus It can realize more accurate detection of the working performance of the tubular busbar.

Specifically, the actual temperature of the inner conductor of the tubular busbar 1 is difficult to directly measure the conductor temperature on the high-voltage conductor due to the insulation coordination. The present disclosure obtains by measuring the surface temperature of the tubular busbar 1 and calculating and compensating through the above formula. The temperature of the inner conductor of the tubular busbar 1, and the temperature sensor 4 is installed on the fixing bracket of the tubular busbar 1. The temperature sensor 4 is in close contact with the tubular busbar 1 to accurately measure the surface temperature, which is safe, easy to replace, and easy to maintain.

Exemplarily, the temperature of the inner conductor of the tubular bus bar 1 can be calculated by using the above formula by considering the thermal conductivity of the silicone rubber and considering the working condition of the surface heat dissipation of the tubular bus bar 1 .

The present disclosure also conducts experimental verification on the above calculations. Specifically, different currents are applied to the tubular bus bar 1, so that the inner conductor of the tubular bus exhibits different temperatures, and then the actual temperature is measured to verify the above formula. The test data are shown in Table 1 and Table 2 respectively.

Table 1 Test verification data with test ambient temperature of 28°C

Table 2 Test verification data with test ambient temperature of 35°C

From the test verification data shown in Table 1 and Table 2 above, it can be seen that when the inner conductor temperature of the tubular busbar 1 is measured by means of calculation and compensation, the measurement error does not exceed ±3°C. In this way, the busbar insulation can be maintained. Measuring the temperature of the inner conductor of the tubular bus bar 1 under the circumstance of the above is conducive to realizing the accurate detection of the online performance of the tubular bus bar 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 passed through the ground wire 7 of the shielding layer of the tubular busbar, and the grounding wire 7 of the shielding layer of the tubular busbar passes through. The first leakage current sensor is directly grounded, and the first leakage current sensor is used to measure the transmission current of the shielding layer grounding wire 7, thereby obtaining the leakage current.

In one embodiment, in order to make the measured leakage current data more accurate, the leakage current data processing unit may calculate the leakage current of the tubular bus bar 1 by using the root mean square method according to the output data of the first leakage current sensor. Exemplarily, the leakage current data processing unit may be set in the background monitoring system. At the same time, the leakage current data processing unit is connected to the background monitoring display device, and at least one of the detected value and the calculated leakage current can be displayed on the display device, thereby facilitating the intuitive presentation of the detection result.

Exemplarily, the leakage current data processing unit includes a memory and a processor, and a computer program is stored in the memory, and the computer program is executed by the processor to realize the following calculations:

In the formula, I _{leakage current} is the calculated leakage current; I ₁ is the value collected by the first leakage current sensor for the first time; I ₂ is the value collected by the first leakage current sensor for the second time; I _n is the first leakage current The value collected by the sensor for the nth time.

In this way, by performing a root mean square operation on a plurality of consecutive leakage currents collected by the first leakage current sensor, a relatively accurate leakage current value within a period of time can be obtained, thereby helping to improve the detection accuracy of the leakage current.

In one embodiment, the dielectric loss detection device can obtain the dielectric loss factor and the capacitance by processing the leakage current and bus voltage data.

Exemplarily, FIG. 3 is a schematic structural diagram of another tubular busbar intelligent detection device according to an embodiment of the present disclosure. 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 leakage current sensor 5 and the third leakage current sensor 6 are both connected to the ground wire 7 of the shielding layer of the tubular busbar for collecting the leakage current of the tubular busbar 1; the busbar voltage sensor 8 is connected to the secondary side of the busbar voltage transformer, such as the busbar The voltage transformer is arranged on the terminal equipment of the tubular busbar, and is used to collect the busbar voltage signal of the tubular busbar 1 . The loss data processing unit is used to receive the leakage current signal and the busbar voltage signal, and calculate the dielectric loss factor of the tubular busbar 1 based on the signal.

Exemplarily, the loss data processing unit includes a memory and a processor, a computer program is stored on the memory, and the computer program is executed by the processor to realize the following calculations:

Tanδ=tan(a+b-c*2);

Among them, Tanδ is the dielectric loss factor; 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.

In this way, the dielectric loss factor can be obtained from the leakage current and the bus voltage.

In one embodiment, in order to make the calculated dielectric loss factor more accurate, the method of calculating the root mean square above can also be used to first obtain the leakage current and bus voltage within the same duration, and then use the leakage current and bus voltage according to the leakage current and bus voltage. The voltage is used to calculate the dielectric loss factor, so as to obtain a more accurate detection result of the dielectric loss factor.

In one embodiment, the first leakage current sensor can use a zero-flux leakage current sensor to detect the leakage current, and the measurement accuracy is high, which is beneficial to realize accurate judgment of the running performance of the tubular busbar.

In one embodiment, the second leakage current sensor 5 and the third leakage current sensor 6 include a pair of reverse-wired feedthrough zero-flux current sensors, and the ground wire 7 of the shielding layer of the tubular busbar passes through the first leakage in the forward direction. The through hole of the current sensor is then passed through the through hole of the second leakage current sensor 5 in reverse direction, and then grounded.

In this way, the use of a pair of reversely wired current sensors is beneficial to offset the interference of the power frequency magnetic field of the tubular bus bar 1 to the detection of the dielectric loss factor, so that the measurement data is more accurate.

In one embodiment, the second leakage current sensor and the first leakage current sensor may be the same component, that is, the same current sensor may be used for both.

This arrangement is beneficial to simplify the overall structure of the tubular busbar intelligent detection device, reduce the lifting weight, reduce the cost, and is beneficial to realize its miniaturized design.

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, which is not limited in the embodiments of the present disclosure.

In one embodiment, the tubular busbar intelligent detection device may further include a capacitance data processing unit to obtain the busbar capacitance based on the leakage current and the busbar voltage. Exemplarily, the capacitance data processing unit may include a memory and a processor, and a computer program is stored on the memory, and the computer program is executed by the processor to realize the following calculations:

In the formula, 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, and a is the second leakage current The leakage current phase angle output by the 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 effective value of the bus voltage.

In this way, 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 installed on site or at a remote location.

Exemplarily, 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, and the processing chip may be arranged on the fixed support 3 . At the same time, each sensor of the present disclosure can be installed on a fixed base.

Exemplarily, the application process of the intelligent detection device for tubular busbars of the present disclosure may be as follows:

1) Install the tubular busbar intelligent detection device on the connection device 2 of the tubular busbar, and each detection device starts to work;

2) The temperature detection device collects the temperature of the outer wall of the tubular busbar 1 in real time, that is, the surface temperature of the tubular busbar is obtained, and the surface temperature is transmitted to the temperature data processing unit for calculation, and then the data before and after processing can be transmitted to the background server. ;

3) The leakage current detection device and the dielectric loss detection device simultaneously sample the leakage current and bus voltage signal of the tube-type bus 1; according to the sampled leakage current and bus voltage signal, the leakage current, capacitance and dielectric loss factor of the tube bus are calculated; After that, the pipe-shaped busbar intelligent detection device can transmit the leakage current, capacitance and dielectric loss factor of the pipe busbar to the background server through communication cables or other signal transmission methods;

4) The background server can store, display and compare and analyze the received detection data.

Based on the same inventive concept, an embodiment of the present disclosure also provides an intelligent detection method for a tubular busbar, which can be performed by any of the tubular busbar intelligent detection devices provided in the above embodiments. Therefore, the method for intelligent detection of tubular busbars also has the technical effects of the above-mentioned intelligent detection device for tubular busbars.

Exemplarily, FIG. 4 is a schematic flowchart of an intelligent detection method for a tubular busbar according to an embodiment of the present disclosure. 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.

S42. The processor determines the temperature of the inner conductor of the tubular bus bar based on the surface temperature and the ambient temperature of the tubular bus bar acquired by the temperature detection device.

S43. The processor determines the leakage current of the tubular busbar based on the N consecutive single leakage currents of the tubular busbar obtained by the leakage current detection device.

S44. The processor determines the dielectric loss factor of the tubular busbar based on the leakage current and the busbar voltage of the tubular busbar obtained by the dielectric loss detection device.

In this way, intelligent online detection of the tubular busbar can be performed, that is, real-time detection is performed during the operation of the tubular busbar, which specifically includes: 1) online detection of the conductor temperature rise of the tubular busbar; 2) online detection of the leakage of the shielding layer of the tubular busbar 3) On-line detection of the dielectric loss and capacitance of the insulating material of the tubular busbar, so as to realize the reliable and stable detection of the tubular busbar, which is beneficial to improve the operation safety of the tubular busbar.

It should be noted that, FIG. 4 only exemplarily shows that S42, S43, and S44 are executed in sequence. In other embodiments, the execution sequence of S42, S43, and S44 may also be other sequences, that is, the present disclosure The calculation sequence of the operating parameters of the tubular busbar is not limited, and can be set according to the requirements of the tubular busbar intelligent detection device and method.

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:

S42 may include: calculating the inner conductor temperature using the following formula:

T=4e ^T1/T0 + T1,

In the formula, T is the inner conductor temperature of the tubular busbar; T1 is the surface temperature of the tubular busbar detected by the temperature sensor; T0 is the ambient temperature.

In this way, the temperature of the inner conductor of the tubular busbar can be determined more accurately, thereby realizing a more accurate detection of the running performance of the tubular busbar.

S43 may include: using the following formula to calculate the leakage current:

In the formula, I _{leakage current} is the leakage current; I ₁ is the value collected by the first leakage current sensor for the first time; I ₂ is the value collected by the first leakage current sensor for the second time; I _n is the nth value collected by the first leakage current sensor value collected.

In this way, a more accurate leakage current value can be obtained, thereby realizing accurate judgment on the running performance of the tubular busbar.

S44 may include: using the following formula to calculate the dielectric loss factor:

Tanδ=tan(a+b-c×2),

Among them, Tanδ is the dielectric loss factor; 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 output by the bus voltage sensor.

In this way, the dielectric loss factor of the tubular busbar can be obtained.

Optionally, the method further includes calculating the capacitance of the busbar, and the specific step may include: using the following formula to calculate the capacitance of the tubular busbar:

Among them, C is the capacitance of the tubular busbar, 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 busbar voltage frequency, and a is the second leakage current sensor. The output leakage current phase angle, b is the leakage current phase angle output by the third leakage current sensor, c is the bus voltage phase angle, and U is the bus voltage effective value.

In this way, the capacitance of the tubular busbar can be obtained.

Therefore, the intelligent detection method of the tubular busbar can realize the real-time online intelligent detection of the operating parameters such as the inner conductor temperature, leakage current, medium damage factor and capacitance of the tubular busbar, which is convenient to monitor the operation performance of the tubular busbar in real time, thereby Make sure it is safe to operate.

The above descriptions are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement 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 implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described 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＝4e^T1/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:

in the formula I_{Leakage current}Is 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 is_nThe 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:

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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