Sleeve live-line dielectric loss test method and related device

Abstract

The embodiment of the invention discloses a sleeve live-line test dielectric loss method and related device, and the method comprises the steps: obtaining a first current of a to-be-tested sleeve in a live-line state of the to-be-tested sleeve; harmonic analysis processing is carried out according to the first current, and a harmonic analysis result is determined and used for indicating whether harmonic exists or not; determining a target test method of the dielectric loss of the to-be-tested bushing based on the harmonic analysis result; and performing a dielectric loss test on the to-be-tested sleeve by using the target test method to obtain the target dielectric loss of the to-be-tested sleeve. Through the above mode, harmonic analysis processing can be performed according to the first current of the to-be-tested bushing, and then the target test method of the dielectric loss of the to-be-tested bushing is determined based on whether the harmonic exists, so that the target dielectric loss of the to-be-tested bushing is obtained, dielectric loss misjudgment caused by the existence of the harmonic is reduced, the dielectric loss test efficiency is improved, and the operation and maintenance amount is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of dielectric loss testing, and in particular to a method for live dielectric loss testing of a bushing and a related device. Background Art

[0002] The bushing is the core component of the transformer. In recent years, there have been many cases of transformer failures caused by bushing failures in the power system, and even transformer fires, causing huge economic losses to the power grid. At present, the transformer bushing test is mainly based on the power outage test, with low test voltage and long power outage period, which cannot timely and accurately reflect the operating status of the bushing. The existing bushing online monitoring and live detection methods are easily affected by factors such as the operating environment and harmonics on site, resulting in large fluctuations in test results, easy to misjudge dielectric loss, and increase the amount of on-site operation and maintenance. In addition, with the development of new power systems, a large number of power electronic components and some nonlinear loads will lead to the generation of harmonics. If dielectric loss is misjudged, it will reduce the efficiency of dielectric loss testing and increase the amount of operation and maintenance. Summary of the invention

[0003] The main purpose of the present invention is to provide a method for live bushing dielectric loss testing and a related device, which can solve the problem of low efficiency of bushing dielectric loss testing in the prior art.

[0004] To achieve the above object, the present invention provides a method for live bushing dielectric loss testing in a first aspect, the method comprising:

[0005] When the bushing to be tested is in a charged state, obtaining a first current of the bushing to be tested;

[0006] Performing harmonic analysis processing on the first current to determine a harmonic analysis result, wherein the harmonic analysis result is used to indicate whether harmonics exist;

[0007] A target test method for determining the dielectric loss of the bushing to be tested based on the harmonic analysis result;

[0008] The target test method is used to perform a dielectric loss test on the bushing to be tested, and a target dielectric loss of the bushing to be tested is obtained.

[0009] In a feasible implementation, the target test method for determining the dielectric loss of the bushing to be tested based on the harmonic analysis result includes:

[0010] If the harmonic analysis result is that no harmonics exist, determining that the target test method is a harmonic-free test method;

[0011] If the harmonic analysis result shows that harmonics exist, the target test method is determined to be a harmonic test method.

[0012] In a feasible implementation, the determining that the target test method is a harmonic-free test method, and then using the target test method to perform a dielectric loss test on the bushing to be tested to obtain a target dielectric loss of the bushing to be tested, includes:

[0013] Acquiring a voltage at a ground terminal of a capacitor voltage transformer, wherein the capacitor voltage transformer is electrically connected to a busbar of the bushing to be tested;

[0014] A first phase difference is determined using the voltage and the first current, and the target dielectric loss includes the first phase difference.

[0015] In a feasible implementation, the determining that the target test method is a harmonic test method, and then using the target test method to perform a dielectric loss test on the bushing to be tested to obtain a target dielectric loss of the bushing to be tested, includes:

[0016] Acquire a second current at a ground terminal of the capacitive voltage transformer;

[0017] A second phase difference is determined using the second current and the first current, and the target dielectric loss includes the second phase difference.

[0018] To achieve the above object, the second aspect of the present invention provides a device for testing dielectric loss of a bushing under voltage, the device comprising:

[0019] A current acquisition module: used for acquiring a first current of the bushing to be tested when the bushing to be tested is in a charged state;

[0020] A harmonic analysis module: used to perform harmonic analysis processing according to the first current to determine a harmonic analysis result, wherein the harmonic analysis result is used to indicate whether there is a harmonic;

[0021] Method determination module: used for determining a target test method of the dielectric loss of the bushing to be tested based on the harmonic analysis result;

[0022] Dielectric loss determination module: used to perform dielectric loss test on the bushing to be tested by using the target test method to obtain target dielectric loss of the bushing to be tested.

[0023] To achieve the above-mentioned object, the third aspect of the present invention provides a system for live bushing dielectric loss testing, the system comprising at least a host, the host being electrically connected to the bushing to be tested, the host being used to execute the steps of the method described in the first aspect and any feasible implementation manner.

[0024] In a feasible implementation, the system further includes a capacitive voltage transformer and a first through-core current sensor, the host is electrically connected to one end of the capacitive voltage transformer and one end of the first through-core current sensor respectively, the other end of the capacitive voltage transformer is electrically connected to the busbar of the bushing to be tested, and the other end of the first through-core current sensor is electrically connected to the end screen of the bushing to be tested;

[0025] The capacitive voltage transformer is used to output the voltage of the ground terminal of the capacitive voltage transformer to the host;

[0026] The first core-through current sensor is used to output a first current of the bushing to be tested to the host.

[0027] In a feasible implementation, the system further includes a second through-core current sensor, the capacitive voltage transformer includes at least a medium-voltage capacitor, and one end of the capacitive voltage transformer is one end of the medium-voltage capacitor;

[0028] The host is electrically connected to one end of the second through-core current sensor, and the other end of the second through-core current sensor is electrically connected to one end of the medium-voltage capacitor;

[0029] The second through-core current sensor is used to output a second current at the ground terminal of the capacitive voltage transformer to the host.

[0030] To achieve the above-mentioned purpose, the fourth aspect of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of the method described in the first aspect and any feasible implementation method.

[0031] To achieve the above-mentioned purpose, the fifth aspect of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method described in the first aspect and any feasible implementation method.

[0032] The embodiments of the present invention have the following beneficial effects:

[0033] The present invention provides a method for testing dielectric loss of a bushing under power, the method comprising: obtaining a first current of the bushing to be tested when the bushing to be tested is under power; performing harmonic analysis processing according to the first current to determine a harmonic analysis result, the harmonic analysis result being used to indicate whether harmonics exist; determining a target test method for dielectric loss of the bushing to be tested based on the harmonic analysis result; performing a dielectric loss test on the bushing to be tested using the target test method to obtain a target dielectric loss of the bushing to be tested. Through the above method, harmonic analysis processing can be first performed according to the first current of the bushing to be tested, and then a target test method for dielectric loss of the bushing to be tested can be determined based on whether harmonics exist, thereby obtaining the target dielectric loss of the bushing to be tested, reducing misjudgment of dielectric loss caused by the presence of harmonics, improving dielectric loss test efficiency, and reducing operation and maintenance workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] in:

[0036] Figure 1 It is a flow chart of a method for live bushing dielectric loss testing in an embodiment of the present invention;

[0037] Figure 2 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 1 ;

[0038] Figure 3 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 2 ;

[0039] Figure 4 Another flow chart of a method for live bushing dielectric loss testing in an embodiment of the present invention;

[0040] Figure 5 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 3 ;

[0041] Figure 6 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 4 ;

[0042] Figure 7 It is a structural block diagram of a device for live bushing dielectric loss testing in an embodiment of the present invention;

[0043] Figure 8 4 is a structural block diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1 , Figure 1 The flowchart of a method for live bushing dielectric loss test in an embodiment of the present invention is shown in FIG. 1 . The method can be applied to both a terminal and a server. The terminal can be a desktop terminal or a mobile terminal. The mobile terminal can be at least one of a mobile phone, a tablet computer, and a notebook computer. The server can be implemented by an independent server or a server cluster composed of multiple servers. This embodiment is described by applying to a terminal as an example. Figure 1 The method shown comprises the following steps:

[0046] 101. When the bushing to be tested is in a charged state, obtain a first current of the bushing to be tested;

[0047] 102. Perform harmonic analysis processing according to the first current to determine a harmonic analysis result, where the harmonic analysis result is used to indicate whether there is a harmonic;

[0048] It should be noted that in order to determine whether there is harmonic interference in the power system where the bushing is located, the first current I of the bushing to be tested is obtained when the bushing to be tested is energized. X , according to the first current I X Perform harmonic analysis and determine the harmonic analysis results, which are used to indicate whether there are harmonics. X The current can be collected by a current sensor, which can be a core-through current sensor (referred to as small CT).

[0049] See also Figure 2 , Figure 2 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 1 ,in, Figure 2 The structure block diagram of a system for testing dielectric loss of bushing with electricity is shown in FIG. The system for testing dielectric loss of bushing with electricity includes at least a host, the host is electrically connected to the bushing to be tested, and the current I of the bushing to be tested can be collected. XThe terminal may include the host, and the host may also be used to execute each step of the method for live bushing dielectric loss testing proposed by the present invention. The host includes but is not limited to various electronic devices with data processing and analysis capabilities.

[0050] Furthermore, the system also includes a voltage transformer and a first through-core current sensor, wherein the voltage transformer may be a capacitive voltage transformer, the host is electrically connected to one end of the capacitive voltage transformer and one end of the first through-core current sensor respectively, the other end of the capacitive voltage transformer is electrically connected to the busbar of the bushing to be tested, and the other end of the first through-core current sensor is electrically connected to the end screen of the bushing to be tested; the capacitive voltage transformer is used to output the voltage U of the grounding terminal of the capacitive voltage transformer N To the host; the first through-core current sensor is used to output the first current I of the bushing to be tested X To the host. Wherein, the first current I is collected X The current sensor may be the first through-core current sensor mentioned above.

[0051] It should be noted that the existing bushing live detection and online monitoring devices are all obtained by detecting the voltage at both ends of the capacitive device (capacitive voltage transformer CVT) and the current generated by it to obtain the dielectric loss tanδ and capacitance Cx parameters. Its basic working principle is as follows Figure 2 As shown in the figure, the voltage U at both ends of the equipment is usually obtained from the bus PT (i.e., the voltage transformer cabinet connected to the bus) or the secondary side of the CVT, and the current Ix flowing through is obtained from the end screen grounding wire of the capacitor type equipment through a through-core current sensor (referred to as small CT). Then, the two signals are collected and processed comprehensively by the monitoring unit, and finally the voltage signal U and current signal I are accurately obtained. X The amplitude and phase difference of the measured signal are obtained to obtain the dielectric loss tanδ and the capacitance Cx value of the capacitive device, and the dielectric loss of the bushing to be tested. The above method can also be regarded as a harmonic-free test method.

[0052] Please continue reading Figure 3 , Figure 3 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 2 Conventional voltage transformers of 110kV and above voltage levels mainly adopt CVT, and its schematic diagram is as follows Figure 3 As shown, Figure 3 C1 and C2 are high-voltage and medium-voltage capacitors respectively; T is the intermediate transformer; L is the compensation reactor; Z d is a damper; BL is a lightning arrester; N is the low-voltage end of the capacitor voltage divider; a and b are the two sets of main secondary winding lead terminals; da, dn, da z Lead out terminals for the damper.

[0053] Under the interference of harmonic voltage signals, the parameters of CVT internal components begin to change, causing the equivalent parameters XL and XC originally tuned to operate under fundamental conditions to also change with the system frequency.

[0054] Right now:

[0055] This will cause the amplitude and phase angle of the CVT secondary output voltage to change. When the dielectric loss is determined by measuring the angular difference between the voltage and current (without harmonic testing method), it will lead to large test errors.

[0056] In order to reduce the interference of harmonics on dielectric loss test, before the test, a first current I X Perform a harmonic analysis to determine if harmonics are present.

[0057] 103. Determine a target test method for dielectric loss of the bushing to be tested based on the harmonic analysis result;

[0058] 104. Perform a dielectric loss test on the bushing to be tested using the target test method to obtain a target dielectric loss of the bushing to be tested.

[0059] Furthermore, the target test method for dielectric loss of the bushing to be tested is determined through the harmonic analysis result. For example, different dielectric loss test methods are used when harmonics exist or do not exist.

[0060] The present invention provides a method for testing dielectric loss of a bushing under power, the method comprising: obtaining a first current of the bushing to be tested when the bushing to be tested is under power; performing harmonic analysis processing according to the first current to determine a harmonic analysis result, the harmonic analysis result being used to indicate whether harmonics exist; determining a target test method for dielectric loss of the bushing to be tested based on the harmonic analysis result; performing a dielectric loss test on the bushing to be tested using the target test method to obtain a target dielectric loss of the bushing to be tested. Through the above method, harmonic analysis processing can be first performed according to the first current of the bushing to be tested, and then a target test method for dielectric loss of the bushing to be tested can be determined based on whether harmonics exist, thereby obtaining the target dielectric loss of the bushing to be tested, reducing misjudgment of dielectric loss caused by the presence of harmonics, improving dielectric loss test efficiency, and reducing operation and maintenance workload.

[0061] See also Figure 4 , Figure 4 FIG. 1 is another flow chart of a method for testing dielectric loss of a bushing under voltage in an embodiment of the present invention. Figure 4 The method shown comprises the following steps:

[0062] 401. When the bushing to be tested is in a charged state, obtain a first current of the bushing to be tested;

[0063] 402. Perform harmonic analysis processing according to the first current to determine a harmonic analysis result, where the harmonic analysis result is used to indicate whether there is a harmonic;

[0064] It should be noted that steps 401 and 402 are Figure 1 The contents of steps 101 and 102 are similar, and are not described here to avoid repetition. For details, please refer to Figure 1 The contents of steps 101 and 102 are shown.

[0065] 403. If the harmonic analysis result is that no harmonics exist, determining that the target test method is a harmonic-free test method;

[0066] 404. If the harmonic analysis result shows that harmonics exist, determining that the target test method is a harmonic test method;

[0067] 405. Perform a dielectric loss test on the bushing to be tested using the target test method to obtain a target dielectric loss of the bushing to be tested.

[0068] In a feasible implementation, if there is no harmonic in the power system, then the target test method is determined to be a harmonic-free test method, wherein the harmonic-free test method uses the phase difference between voltage and current to obtain dielectric loss, and step 405 may include steps A01 to A02:

[0069] A01. Obtaining a voltage at a ground terminal of a capacitor voltage transformer, wherein the capacitor voltage transformer is electrically connected to a busbar of the bushing to be tested;

[0070] A02. Determine a first phase difference using the voltage and the first current, wherein the target dielectric loss includes the first phase difference.

[0071] It should be noted that if it is determined that there are no harmonics, the voltage U at the ground terminal of the capacitive voltage transformer can be used. N and the first current I X The phase difference between the two can be used to obtain the target dielectric loss. Figure 2 and Figure 3 The working principle shown realizes the test of target dielectric loss.

[0072] In a feasible implementation, if there are harmonics in the power system, there will be a large error if the harmonic-free method is continued to be used. At this time, the target test method is determined to be a harmonic test method, wherein the harmonic test method uses the phase difference between the current and the current to obtain the dielectric loss. Then step 405 includes steps B01 and B02:

[0073] B01. Obtaining a second current at a ground terminal of the capacitive voltage transformer;

[0074] B02. Determine a second phase difference using the second current and the first current, wherein the target dielectric loss includes the second phase difference.

[0075] It should be noted that, in order to realize harmonic testing, the present application provides another system for testing dielectric loss of bushing under voltage. The system for testing dielectric loss of bushing under voltage is improved. Figure 2 and Figure 3 The system shown is obtained.

[0076] See also Figure 5 and Figure 6 , Figure 5 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 3 , Figure 6 The working principle of a system for testing dielectric loss of bushing under voltage in an embodiment of the present invention is shown in FIG. Figure 4 , Figure 5 It shows that the host collects two currents, Figure 6 It is shown that the second through-core current sensor (small CT) is arranged between the medium voltage capacitor C2 of the voltage transformer and the ground terminal.

[0077] like Figure 5 and Figure 6 The system for testing dielectric loss of bushing under voltage as shown includes a host, a first through-core current sensor, a second through-core current sensor and a capacitor voltage transformer, wherein the system includes an electrical connection between the host and the bushing to be tested, the host is used to execute the steps of the method for testing dielectric loss of bushing under voltage as shown in the present application, the system also includes a capacitor voltage transformer and a first through-core current sensor, the host is electrically connected to one end of the capacitor voltage transformer and one end of the first through-core current sensor respectively, the other end of the capacitor voltage transformer is electrically connected to the busbar of the bushing to be tested, and the other end of the first through-core current sensor is electrically connected to the end screen of the bushing to be tested; the capacitor voltage transformer includes at least a medium-voltage capacitor, and one end of the capacitor voltage transformer is one end of the medium-voltage capacitor; the host is electrically connected to one end of the second through-core current sensor, and the other end of the second through-core current sensor is electrically connected to one end of the medium-voltage capacitor.

[0078] The capacitive voltage transformer is used to output the voltage U of the ground terminal of the capacitive voltage transformer. N To the host; the first through-core current sensor is used to output the first current I of the bushing to be tested X To the host; the second through-core current sensor is used to output the second current I of the ground terminal of the capacitive voltage transformer N to the host.

[0079] It is understandable that the existing bushing live test device is modified and a CT is installed at the C2 grounding terminal of the CVT to test the current I of the CVT. N ; By measuring the current Ix flowing through Cx, the harmonic content analysis is carried out to determine the presence of harmonic voltage in the test environment; when no harmonics exist, follow the above Figure 2 and 3 The dielectric loss test is carried out in this way.

[0080] If the first step of testing determines that harmonics exist, the harmonic test method will be used. Due to the change in the parameter characteristics of the CVT during harmonics, the secondary voltage and the amplitude of the phase angle will change significantly. At this time, taking the voltage from the CVT secondary will inevitably lead to a large test error. Therefore, if harmonics occur, a detection CT will be installed at the N end of the CVT to detect the current. Using data processing technology, the current collected from the tested bushing and the current measured at the N end of the CVT are Fourier transformed to read the fundamental current and phase angle. Since the dielectric loss of the CVT is generally small, the fundamental current of the CVT is selected as the reference, and the angle is compared with the fundamental current of Cx. At this time, the dielectric loss of the tested equipment can be accurately measured.

[0081] The embodiment of the present invention discloses a method for testing dielectric loss of a bushing under power, the method comprising: obtaining a first current of the bushing under power under power; performing harmonic analysis processing according to the first current to determine a harmonic analysis result, the harmonic analysis result is used to indicate whether harmonics exist; if the harmonic analysis result is that harmonics exist, determining that the target test method is a harmonic test method; performing a dielectric loss test on the bushing under power by using the target test method to obtain a target dielectric loss of the bushing under power; performing a dielectric loss test on the bushing under power by using the target test method to obtain a target dielectric loss of the bushing under power. The present invention can eliminate the measurement error caused by harmonic voltage during field testing, thereby ensuring accurate field testing, so as to timely and accurately detect the operating status of the bushing in operation and prevent and control transformer bushing failures.

[0082] See also Figure 7 , Figure 7 FIG. 1 is a structural diagram of a device for testing dielectric loss of a bushing under voltage in an embodiment of the present invention. Figure 7 The device shown comprises:

[0083] Current acquisition module 701: used for acquiring a first current of the bushing to be tested when the bushing to be tested is in a charged state;

[0084] Harmonic analysis module 702: used to perform harmonic analysis processing according to the first current to determine a harmonic analysis result, wherein the harmonic analysis result is used to indicate whether there is a harmonic;

[0085] Method determination module 703: used to determine the target test method of the dielectric loss of the bushing to be tested based on the harmonic analysis result;

[0086] The dielectric loss determination module 704 is configured to perform a dielectric loss test on the bushing to be tested by using the target test method to obtain a target dielectric loss of the bushing to be tested.

[0087] It should be noted that Figure 7 The functions of each module in the device shown are Figure 1 The contents of each step in the method shown are similar. To avoid repetition, they are not described here. For details, please refer to Figure 1 The content of each step in the method shown.

[0088] The present invention provides a device for testing dielectric loss of bushing under power, the device comprising: a current acquisition module: used for acquiring the first current of the bushing to be tested when the bushing to be tested is under power; a harmonic analysis module: used for performing harmonic analysis processing according to the first current to determine the harmonic analysis result, the harmonic analysis result is used to indicate whether there is harmonic; a method determination module: used for determining the target test method of dielectric loss of the bushing to be tested based on the harmonic analysis result; a dielectric loss determination module: used for performing dielectric loss test of the bushing to be tested using the target test method to obtain the target dielectric loss of the bushing to be tested. Through the above method, harmonic analysis processing can be first performed according to the first current of the bushing to be tested, and then the target test method of dielectric loss of the bushing to be tested can be determined based on whether there is harmonic, so as to obtain the target dielectric loss of the bushing to be tested, reduce the misjudgment of dielectric loss caused by the presence of harmonics, improve the efficiency of dielectric loss testing, and reduce the amount of operation and maintenance.

[0089] Figure 8 FIG. 1 shows an internal structure diagram of a computer device in an embodiment. The computer device may be a terminal or a server. Figure 8 As shown, the computer device includes a processor, a memory and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement the above method. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can implement the above method. Those skilled in the art can understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0090] In one embodiment, a computer device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps: Figure 1 or Figure 4 Steps shown.

[0091] In one embodiment, a computer-readable storage medium is provided, which stores a computer program. When the computer program is executed by a processor, the processor performs the following steps: Figure 1 or Figure 4 Steps shown.

[0092] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0093] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for testing dielectric loss of a bushing under voltage, characterized in that: The method comprises: When the bushing to be tested is in a charged state, obtaining a first current of the bushing to be tested; Performing harmonic analysis processing on the first current to determine a harmonic analysis result, wherein the harmonic analysis result is used to indicate whether harmonics exist; A target test method for determining the dielectric loss of the bushing to be tested based on the harmonic analysis result; The target test method is used to perform a dielectric loss test on the bushing to be tested, and a target dielectric loss of the bushing to be tested is obtained.

2. The method according to claim 1, characterized in that: The target test method for determining the dielectric loss of the bushing to be tested based on the harmonic analysis result includes: If the harmonic analysis result is that no harmonics exist, determining that the target test method is a harmonic-free test method; If the harmonic analysis result shows that harmonics exist, the target test method is determined to be a harmonic test method.

3. The method according to claim 2, characterized in that: Determining that the target test method is a harmonic-free test method, and then using the target test method to perform a dielectric loss test on the bushing to be tested to obtain a target dielectric loss of the bushing to be tested, includes: Acquiring a voltage at a ground terminal of a capacitor voltage transformer, wherein the capacitor voltage transformer is electrically connected to a busbar of the bushing to be tested; A first phase difference is determined using the voltage and the first current, and the target dielectric loss includes the first phase difference.

4. The method according to claim 3, characterized in that: Determining that the target test method is a harmonic test method, and then using the target test method to perform a dielectric loss test on the bushing to be tested to obtain a target dielectric loss of the bushing to be tested, includes: Acquire a second current at a ground terminal of the capacitive voltage transformer; A second phase difference is determined using the second current and the first current, and the target dielectric loss includes the second phase difference.

5. A device for testing dielectric loss of bushing under voltage, characterized in that: The device comprises: A current acquisition module: used for acquiring a first current of the bushing to be tested when the bushing to be tested is in a charged state; A harmonic analysis module: used to perform harmonic analysis processing according to the first current to determine a harmonic analysis result, wherein the harmonic analysis result is used to indicate whether there is a harmonic; Method determination module: used for determining a target test method of the dielectric loss of the bushing to be tested based on the harmonic analysis result; Dielectric loss determination module: used to perform dielectric loss test on the bushing to be tested by using the target test method to obtain target dielectric loss of the bushing to be tested.

6. A system for conducting live bushing dielectric loss testing, the system comprising at least a host, the host being electrically connected to the bushing to be tested, and the host being used to execute the steps of the method according to any one of claims 1 to 4.

7. The system according to claim 6, characterized in that: The system further includes a capacitive voltage transformer and a first through-core current sensor, wherein the host is electrically connected to one end of the capacitive voltage transformer and one end of the first through-core current sensor respectively, the other end of the capacitive voltage transformer is electrically connected to the busbar of the bushing to be tested, and the other end of the first through-core current sensor is electrically connected to the end screen of the bushing to be tested; The capacitive voltage transformer is used to output the voltage of the ground terminal of the capacitive voltage transformer to the host; The first core-through current sensor is used to output a first current of the bushing to be tested to the host.

8. The system according to claim 6, characterized in that: The system further comprises a second through-core current sensor, the capacitive voltage transformer comprises at least a medium voltage capacitor, and one end of the capacitive voltage transformer is one end of the medium voltage capacitor; The host is electrically connected to one end of the second through-core current sensor, and the other end of the second through-core current sensor is electrically connected to one end of the medium-voltage capacitor; The second through-core current sensor is used to output a second current at the ground terminal of the capacitive voltage transformer to the host.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 4.

10. A computer device comprising a memory and a processor, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 4.

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