Method and device for detecting three-phase lightning arrester with grading ring

Abstract

The embodiment of the invention discloses a detection method and device for a three-phase lightning arrester with a grading ring. The detection method of the three-phase lightning arrester with the grading ring comprises the following steps: obtaining detection data of the three-phase lightning arrester with the grading ring; determining leakage current characteristic parameters of the three-phase lightning arrester with the grading rings according to the phase diagram of the three-phase lightning arrester with the grading rings, the leakage current characteristics of the three-phase lightning arrester with the grading rings and the detection data; and determining the insulation state of the three-phase lightning arrester with the grading ring according to the leakage current characteristic parameters of the three-phase lightning arrester with the grading ring. According to the scheme, the leakage current characteristic parameters of the three-phase lightning arrester with the grading ring can be accurately obtained, and then the insulation state of the three-phase lightning arrester is accurately determined.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power grid technology, and in particular to a detection method and device for a three-phase lightning arrester with a grading ring. Background Art

[0002] At present, the three-phase arrester with grading ring in the substation mainly adopts the method of live leakage current testing to measure the leakage current and its resistive component of the arrester with grading ring during operation to monitor its insulation state. However, due to the complex electric field environment of the open substation, the three-phase arrester with grading ring will be disturbed by the electric field, so that the grading ring of each phase arrester with grading ring generates coupling capacitance with the flange and base of the adjacent phase, thereby interfering with the leakage current detection results of the three-phase arrester with grading ring, resulting in inaccurate detection data, and thus unable to accurately judge the insulation state of the three-phase arrester with grading ring. Summary of the invention

[0003] The embodiment of the present invention provides a detection method and device for a three-phase arrester with a grading ring, so as to accurately obtain the leakage current characteristic parameters of the three-phase arrester with a grading ring, and then accurately determine the insulation state of the three-phase arrester.

[0004] In a first aspect, an embodiment of the present invention provides a detection method for a three-phase arrester with a grading ring, and the detection method for a three-phase arrester with a grading ring includes:

[0005] Obtaining detection data of the three-phase arrester with grading ring;

[0006] Determine the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the three-phase arrester with a grading ring, the leakage current characteristics of the three-phase arrester with a grading ring and the detection data;

[0007] According to the leakage current characteristic parameters of the three-phase arrester with a grading ring, the insulation state of the three-phase arrester with a grading ring is determined.

[0008] Optionally, the three-phase arrester with a grading ring includes an A-phase arrester with a grading ring, a B-phase arrester with a grading ring, and a C-phase arrester with a grading ring;

[0009] The phase diagram includes a leakage current phase diagram of a surge arrester with a grading ring in phase A, a leakage current phase diagram of a surge arrester with a grading ring in phase B, and a leakage current phase diagram of a surge arrester with a grading ring in phase C;

[0010] The A-phase arrester with a grading ring leakage current phase diagram is a phase diagram between the detection leakage current, the target leakage current and the interference current of the A-phase arrester with a grading ring;

[0011] The B-phase arrester with a grading ring leakage current phase diagram is a phase diagram between the detection leakage current, the target leakage current and the interference current of the B-phase arrester with a grading ring;

[0012] The C-phase arrester with a grading ring leakage current phase diagram is a phase diagram between the detection leakage current, the target leakage current and the interference current of the C-phase arrester with a grading ring.

[0013] Optionally, the detection data includes detection data of a lightning arrester with a voltage-grading ring on phase A, detection data of a lightning arrester with a voltage-grading ring on phase B, and detection data of a lightning arrester with a voltage-grading ring on phase C;

[0014] The step of determining the leakage current characteristic parameters of the three-phase arrester with a grading ring comprises:

[0015] Determine a first leakage current capacitive component increase / decrease model and a first leakage current resistive component increase / decrease model according to the A-phase arrester with a grading ring leakage current phase diagram and the A-phase arrester with a grading ring detection data;

[0016] Determine a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model according to the B-phase arrester with grading ring leakage current phase diagram and the B-phase arrester with grading ring detection data;

[0017] Determine a third leakage current capacitive component increase / decrease model and a third leakage current resistive component increase / decrease model according to the C-phase arrester with grading ring leakage current phase diagram and the C-phase arrester with grading ring detection data;

[0018] Determining a capacitive component equivalent model of the leakage current according to the leakage current characteristics;

[0019] According to the first leakage current capacitive component increase / decrease model, the first leakage current resistive component increase / decrease model, the second leakage current capacitive component increase / decrease model, the second leakage current resistive component increase / decrease model, the third leakage current capacitive component increase / decrease model, the third leakage current resistive component increase / decrease model and the leakage current capacitive component equalization model, the leakage current characteristic parameters of the three-phase arrester with grading ring are obtained.

[0020] Optionally, the detection data of the A-phase arrester with a grading ring includes the A-phase detection leakage current value and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage;

[0021] The increase and decrease model of the capacitive component of the first leakage current is:

[0022]

[0023] The increase and decrease model of the resistive component of the first leakage current is:

[0024]

[0025] Among them, I a1 Detecting leakage current value for phase A, is the A phase detection angle, I A1 is the target leakage current value of the A-phase arrester with grading ring, The target leakage current of the A-phase arrester with a grading ring leads the A-phase bus voltage by the target interference angle of the A-phase, I x1 is the interference current value of the A phase arrester with grading ring.

[0026] Optionally, the C-phase arrester with grading ring detection data includes a C-phase detection leakage current value and a C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage;

[0027] The increase and decrease model of the third leakage current capacitive component is:

[0028]

[0029] The increase and decrease model of the resistive component of the third leakage current is:

[0030]

[0031] Among them, I c1 Detecting leakage current value for the C phase, is the C phase detection angle, I C1 is the target leakage current value of the C-phase arrester with grading ring, is the C-phase target interference angle at which the target leakage current of the C-phase arrester with a grading ring leads the C-phase bus voltage, I x2 is the interference current value of the C phase arrester with grading ring.

[0032] Optionally, the detection data of the B-phase arrester with a grading ring includes a B-phase detection leakage current value and a B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage;

[0033] The increase and decrease model of the capacitive component of the second leakage current is:

[0034]

[0035] The increase and decrease model of the resistive component of the second leakage current is:

[0036]

[0037] Among them, I b1 Detecting leakage current value for the B phase, is the B phase detection angle, I B1 is the target leakage current value of the B-phase arrester with grading ring, is the target interference angle of the B phase that the target leakage current of the B phase arrester with grading ring leads the B phase bus voltage, I x3 and I x4 All are the interference current values ​​of the B-phase arrester with grading ring;

[0038] The interference current value I of the A phase arrester with grading ring x1 , the interference current value I of the C phase arrester with grading ring x2 And the interference current value I of the B phase arrester with grading ring x3 and I x4 Are equal.

[0039] Optionally, the leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model and an A-phase and C-phase leakage current capacitive component equivalent model;

[0040] The equivalent model of the capacitive component of the A-phase and B-phase leakage current is:

[0041]

[0042] The equivalent model of the capacitive component of the A-phase and C-phase leakage current is:

[0043]

[0044] Among them, I A1 is the target leakage current value of the A-phase arrester with grading ring, The target leakage current of the A-phase arrester with a grading ring leads the A-phase bus voltage by the target interference angle of the A-phase, I C1 is the target leakage current value of the C-phase arrester with grading ring, is the C-phase target interference angle at which the target leakage current of the C-phase arrester with a grading ring leads the C-phase bus voltage, I B1 is the target leakage current value of the B-phase arrester with grading ring, The B-phase target angle that the target leakage current of the B-phase grading ring arrester leads the B-phase bus voltage.

[0045] Optionally, the leakage current characteristic parameters include the resistive component of the A-phase leakage current of the A-phase with a grading ring arrester, the resistive component of the B-phase leakage current of the B-phase with a grading ring arrester, the resistive component of the C-phase leakage current of the C-phase with a grading ring arrester, the A-phase target interference angle of the target leakage current of the A-phase with a grading ring arrester leading the A-phase bus voltage, the B-phase target interference angle of the target leakage current of the B-phase with a grading ring arrester leading the B-phase bus voltage, and the C-phase target interference angle of the target leakage current of the C-phase with a grading ring arrester leading the C-phase bus voltage.

[0046] Optionally, the A phase leakage current resistive component I AR for:

[0047]

[0048] The B phase leakage current resistive component I BR for:

[0049]

[0050] The resistive component of the C phase leakage current is:

[0051]

[0052] The A-phase target interference angle for:

[0053]

[0054] The B-phase target interference angle for:

[0055]

[0056] The C-phase target interference angle for:

[0057]

[0058] Among them, I a1 Detecting leakage current value for phase A, is the A phase detection angle, I c1 Detecting leakage current value for the C phase, is the C phase detection angle, I b1 Detecting leakage current value for the B phase, is the B phase detection angle.

[0059] In a second aspect, an embodiment of the present invention further provides a detection device for a three-phase arrester with a grading ring, the detection device for a three-phase arrester with a grading ring comprising:

[0060] An acquisition module, used for acquiring detection data of the three-phase arrester with grading ring;

[0061] A leakage current characteristic parameter determination module, used to determine the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the three-phase arrester with a grading ring, the leakage current characteristics of the three-phase arrester with a grading ring and the detection data;

[0062] A state determination module is used to determine the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the arrester with a grading ring. The embodiment of the present invention obtains the detection data of the three-phase arrester with a grading ring; determines the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the arrester with a grading ring, the leakage current characteristics of the arrester with a grading ring and the detection data; determines the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the arrester with a grading ring. Therefore, the leakage current characteristic parameters of the three-phase arrester with a grading ring can be accurately obtained by the above method, and then the insulation state of the three-phase arrester can be accurately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0064] Figure 1 A schematic diagram of phase coupling of a three-phase arrester with a grading ring provided by the prior art;

[0065] Figure 2 A schematic flow chart of a detection method for a three-phase arrester with a grading ring provided in an embodiment of the present invention;

[0066] Figure 3 A leakage current phase diagram of a phase A lightning arrester with a grading ring provided in an embodiment of the present invention;

[0067] Figure 4 A leakage current phase diagram of a C-phase arrester with a grading ring provided in an embodiment of the present invention;

[0068] Figure 5 A leakage current phase diagram of a B-phase arrester with a grading ring provided in an embodiment of the present invention;

[0069] Figure 6 A schematic flow chart of the steps of determining the leakage current characteristic parameters of a three-phase arrester with a grading ring provided in an embodiment of the present invention;

[0070] Figure 7 A schematic structural diagram of a detection device for a three-phase arrester with a grading ring provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0071] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0073] Figure 1 A schematic diagram of phase coupling of a three-phase arrester with a voltage-grading ring provided by the prior art is shown in FIG. Figure 1 As shown, the arrester with equalizing ring on the left is the arrester with equalizing ring of phase A, the arrester with equalizing ring in the middle is the arrester with equalizing ring of phase B, and the arrester with equalizing ring on the right is the arrester with equalizing ring of phase C; the base of the arrester with equalizing ring of phase A will be subject to coupling interference of the equalizing ring of the arrester with equalizing ring of phase B, the base of the arrester with equalizing ring of phase C will be subject to coupling interference of the equalizing ring of the arrester with equalizing ring of phase B, and the base of the arrester with equalizing ring of phase B will be subject to coupling interference of the equalizing rings of the arrester with equalizing ring of phase A and the arrester with equalizing ring of phase C, thereby making the leakage current of the three-phase arrester with equalizing ring inaccurate, and making it impossible to accurately judge the insulation state of the three-phase arrester with equalizing ring.

[0074] In view of the above problems, the embodiment of the present invention proposes a detection method for a three-phase arrester with a grading ring. Figure 2A flow chart of a detection method for a three-phase arrester with a grading ring provided in an embodiment of the present invention. This embodiment is applicable to situations where insulation detection of a three-phase arrester with a grading ring is required, and the method can be performed by a detection device for a three-phase arrester with a grading ring. Figure 1 As shown, the method specifically comprises the following steps:

[0075] S110, obtaining detection data of a three-phase arrester with a grading ring.

[0076] Among them, the detection data of the three-phase arrester with grading ring is the leakage current of each phase arrester with grading ring obtained by the live test of the three-phase arrester with grading ring and the angle at which the leakage current of each phase arrester with grading ring leads the bus voltage of its corresponding phase.

[0077] Specifically, the three-phase arrester with a grading ring includes an A-phase arrester with a grading ring, a B-phase arrester with a grading ring and a C-phase arrester with a grading ring, and the detection data includes the detection data of the A-phase arrester with a grading ring, the detection data of the B-phase arrester with a grading ring and the detection data of the C-phase arrester with a grading ring; wherein the detection data of the A-phase arrester with a grading ring includes the A-phase detection leakage current value and the A-phase detection angle of the A-phase detection leakage current leading the A-phase bus voltage; the detection data of the C-phase arrester with a grading ring includes the C-phase detection leakage current value and the C-phase detection angle of the C-phase detection leakage current leading the C-phase bus voltage; the detection data of the B-phase arrester with a grading ring includes the B-phase detection leakage current value and the B-phase detection angle of the B-phase detection leakage current leading the B-phase bus voltage.

[0078] Among them, the A phase detection leakage current is the detection leakage current of the A phase with a grading ring arrester, and the A phase detection leakage current value is the scalar value of the detection leakage current of the A phase with a grading ring arrester; the B phase detection leakage current is the detection leakage current of the B phase with a grading ring arrester, and the B phase detection leakage current value is the scalar value of the detection leakage current of the B phase with a grading ring arrester; the C phase detection leakage current is the detection leakage current of the C phase with a grading ring arrester, and the C phase detection leakage current value is the scalar value of the detection leakage current of the C phase with a grading ring arrester.

[0079] S120, determining leakage current characteristic parameters of the three-phase arrester with a grading ring according to a phase diagram of the three-phase arrester with a grading ring, leakage current characteristics of the three-phase arrester with a grading ring, and detection data.

[0080] Among them, the phase diagram of the three-phase arrester with a grading ring refers to the phase relationship diagram between the detection leakage current, target leakage current and interference current of the three-phase arrester with a grading ring. The phase diagram includes the phase diagram of the leakage current of the arrester with a grading ring of phase A, the phase diagram of the leakage current of the arrester with a grading ring of phase B and the phase diagram of the leakage current of the arrester with a grading ring of phase C; the phase diagram of the leakage current of the arrester with a grading ring of phase A is the phase relationship diagram between the detection leakage current, target leakage current and interference current of the arrester with a grading ring of phase A; the phase diagram of the leakage current of the arrester with a grading ring of phase B is the phase relationship diagram between the detection leakage current, target leakage current and interference current of the arrester with a grading ring of phase B; the phase diagram of the leakage current of the arrester with a grading ring of phase C is the phase diagram between the detection leakage current, target leakage current and interference current of the arrester with a grading ring of phase C.

[0081] The detection leakage current of the A-phase arrester with a grading ring is the leakage current of the A-phase arrester with a grading ring after a live test. The detection leakage current of the B-phase arrester with a grading ring is the leakage current of the B-phase arrester with a grading ring after a live test. The detection leakage current of the C-phase arrester with a grading ring is the leakage current of the C-phase arrester with a grading ring after a live test. The target leakage current of the A-phase arrester with a grading ring is the actual leakage current of the A-phase arrester with a grading ring. The target leakage current of the B-phase arrester with a grading ring is the actual leakage current of the B-phase arrester with a grading ring. The target leakage current of the lightning arrester is the actual leakage current of the C phase lightning arrester with a grading ring; the interference current of the A phase lightning arrester with a grading ring refers to the current caused by the coupling interference of the grading ring of the B phase lightning arrester with a grading ring on the base of the A phase lightning arrester with a grading ring; the interference current of the C phase lightning arrester with a grading ring refers to the current caused by the coupling interference of the grading ring of the B phase lightning arrester with a grading ring on the base of the C phase lightning arrester with a grading ring; the interference current of the B phase lightning arrester with a grading ring refers to the current caused by the coupling interference of the grading rings of the A phase lightning arrester with a grading ring and the C phase lightning arrester with a grading ring on the base of the B phase lightning arrester with a grading ring.

[0082] For example, Figure 3 A leakage current phase diagram of a phase A lightning arrester with a grading ring provided in an embodiment of the present invention, Figure 3 In the figure, the detection leakage current of the A-phase arrester with grading ring is marked. Target leakage current And interference current The relationship between Detection leakage current of A phase arrester with grading ring Target leakage current And interference current With A phase bus voltage U A , B phase bus voltage U BAnd the C phase bus voltage U C The positional relationship between them, such as interference current With B phase bus voltage U B Vertical, target leakage current Leading A-phase bus voltage U A A phase target interference angle wait.

[0083] Figure 4 A leakage current phase diagram of a C-phase arrester with a grading ring provided in an embodiment of the present invention, marking the detection leakage current of the C-phase arrester with a grading ring Target leakage current And interference current The relationship between Detection leakage current of C phase arrester with grading ring Target leakage current And interference current With A phase bus voltage U A , B phase bus voltage U B And the C phase bus voltage U C The positional relationship between them, such as interference current With B phase bus voltage U B Vertical, target leakage current Leading C phase bus voltage U C C-phase target interference angle wait.

[0084] Figure 5 A leakage current phase diagram of a B-phase arrester with a grading ring provided in an embodiment of the present invention, marking the detection leakage current of the B-phase arrester with a grading ring Target leakage current Interference current And interference current The relationship between Detection leakage current of B phase arrester with grading ring Target leakage current Interference current And interference current With A phase bus voltage U A , B phase bus voltage U B And the C phase bus voltage U C The positional relationship between them, such as interference current With C phase bus voltage U C Vertical, interference current With A phase bus voltage U A Vertical, target leakage current Leading B-phase bus voltage UB Phase B target interference angle wait.

[0085] In addition, the interference current of the A phase with grading ring arrester The interference current of the C-phase arrester with grading ring The interference current of the A-phase arrester with grading ring The model and the interference current of the B phase arrester with grading ring are equal in magnitude (scalar value equality).

[0086] Therefore, according to the phase diagram of the three-phase arrester with a grading ring, it can be known that the vector sum of the target leakage current and the interference current of each phase arrester with a grading ring is equal to the detection leakage current. Therefore, it can be confirmed that the target leakage current, interference current and detection leakage current of each phase arrester with a grading ring are all in the vertical direction of the corresponding phase bus voltage. The capacitive component relationship of the leakage current confirms that the target leakage current, interference current and detection leakage current of each phase arrester with a grading ring are all in the direction of the corresponding phase bus voltage. The resistive component relationship of the leakage current. Substituting the known amount of detection data into the capacitive component relationship of the leakage current, the capacitive component increase and decrease model of the leakage current of each phase arrester with a grading ring can be obtained. Substituting the known amount of detection data into the resistive component relationship of the leakage current, the resistive component increase and decrease model of the leakage current of each phase arrester with a grading ring can be obtained.

[0087] Since the arrester with grading rings in each phase has the same model and structure, it can be known from the leakage current characteristics that the capacitive component of the leakage current in each phase is equal, thereby obtaining a model of the equal amount of the capacitive component of the leakage current.

[0088] In addition, the leakage current characteristic parameters include the resistive component of the A-phase leakage current of the A-phase arrester with a grading ring, the resistive component of the B-phase leakage current of the B-phase arrester with a grading ring, the resistive component of the C-phase leakage current of the C-phase arrester with a grading ring, the A-phase target interference angle of the target leakage current of the A-phase arrester with a grading ring leading the A-phase bus voltage, the B-phase target interference angle of the leakage current of the B-phase arrester with a grading ring leading the B-phase bus voltage, and the C-phase target interference angle of the leakage current of the C-phase arrester with a grading ring leading the C-phase bus voltage. Among them, the resistive component of the A-phase leakage current is the component of the target leakage current of the A-phase arrester with a grading ring in the direction of the A-phase bus voltage, the resistive component of the B-phase leakage current is the component of the target leakage current of the B-phase arrester with a grading ring in the direction of the B-phase bus voltage, and the resistive component of the C-phase leakage current is the component of the target leakage current of the C-phase arrester with a grading ring in the direction of the C-phase bus voltage.

[0089] The leakage current characteristic parameters can be obtained by combining and solving the increase and decrease model of the leakage current capacitive component of each phase arrester with a grading ring, the increase and decrease model of the leakage current resistive component, and the equal model of the leakage current capacitive component.

[0090] S130. Determine the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the arrester with a grading ring.

[0091] Among them, the resistive component of the leakage current is generated by the conduction of the three-phase lightning arrester, which can reflect the insulation performance of the lightning arrester. Therefore, the insulation state of the three-phase lightning arrester can be determined based on the leakage current characteristic parameters.

[0092] The embodiment of the present invention obtains the detection data of the three-phase arrester with a grading ring; determines the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the arrester with a grading ring, the leakage current characteristics of the arrester with a grading ring and the detection data; determines the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the arrester with a grading ring. Therefore, the leakage current characteristic parameters of the three-phase arrester with a grading ring can be accurately obtained by the above method, and then the insulation state of the three-phase arrester can be accurately determined.

[0093] On the basis of the above embodiment, optionally, the detection data includes detection data of a lightning arrester with a grading ring of phase A, detection data of a lightning arrester with a grading ring of phase B, and detection data of a lightning arrester with a grading ring of phase C.

[0094] Among them, the detection data of the A-phase lightning arrester with a grading ring is the leakage current data obtained by the live test of the A-phase lightning arrester with a grading ring, the detection data of the B-phase lightning arrester with a grading ring is the leakage current data obtained by the live test of the B-phase lightning arrester with a grading ring, and the detection data of the C-phase lightning arrester with a grading ring is the leakage current data obtained by the live test of the C-phase lightning arrester with a grading ring.

[0095] Figure 6 A flow chart of the steps of determining the leakage current characteristic parameters of a three-phase arrester with a grading ring provided by an embodiment of the present invention is as follows: Figure 6 As shown in the figure, the steps for determining the leakage current characteristic parameters of a three-phase arrester with a grading ring are described:

[0096] S210, determining a first leakage current capacitive component increase / decrease model and a first leakage current resistive component increase / decrease model according to a leakage current phase diagram of the A-phase arrester with a grading ring and detection data of the A-phase arrester with a grading ring.

[0097] Among them, the first leakage current capacitive component increase / decrease model is a model that can reflect the increase / decrease of the leakage current capacitive component of the A-phase arrester with a grading ring, and the first leakage current capacitive component increase / decrease model is a model that can reflect the increase / decrease of the leakage current resistive component of the A-phase arrester with a grading ring.

[0098] Specifically, refer to Figure 3 It can be seen that Interference current With B phase bus voltage U B Vertical, A-phase bus voltage U A With B phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the A phase arrester with grading ring Leading A phase voltage U A The angle is 30°, the target leakage current At phase A bus voltage U A Vertical component and detection leakage current At phase A bus voltage U A The difference in the vertical components is equal to the interference current At phase A bus voltage U A The vertical component can reflect the increase or decrease of the capacitive component of the leakage current of the A-phase arrester with a grading ring; detect the leakage current At phase A bus voltage U A The component and target leakage current At phase A bus voltage U A The difference of the components is equal to the interference current At phase A bus voltage U A The component can reflect the increase or decrease of the resistive component of the leakage current of the A-phase arrester with a grading ring.

[0099] Therefore, the first leakage current capacitive component increase / decrease model can be determined according to the increase / decrease of the leakage current capacitive component of the A-phase arrester with a grading ring; the first leakage current resistive component increase / decrease model can be determined according to the increase / decrease of the leakage current resistive component of the A-phase arrester with a grading ring.

[0100] S220, determining a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model according to a B-phase arrester with a grading ring leakage current phase diagram and detection data of the B-phase arrester with a grading ring.

[0101] Specifically, refer to Figure 5 It can be seen that Interference current With C phase bus voltage U C Vertical, interference current With A phase bus voltage U A Vertical, A-phase bus voltage U A With B phase bus voltage U B The angle is 120°, and the C phase bus voltage U C With B phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the B phase arrester with grading ring and interference current Both lead the B phase voltage U B The angle is 30°, the target leakage current At the B phase bus voltage U B Vertical component and detection leakage current At the B phase bus voltage U B The difference in the vertical components is equal to the interference current and interference current At the B phase bus voltage U B The vertical component can reflect the increase or decrease of the capacitive component of the leakage current of the B-phase arrester with a grading ring; detect the leakage current At the B phase bus voltage U B The component and target leakage current At the B phase bus voltage U B The difference of the components is equal to the interference current and interference current At the B phase bus voltage U B The component can reflect the increase or decrease of the resistive component of the leakage current of the B-phase arrester with grading ring.

[0102] Therefore, the second leakage current capacitive component increase / decrease model can be determined according to the increase / decrease of the leakage current capacitive component of the B-phase arrester with a grading ring; the second leakage current resistive component increase / decrease model can be determined according to the increase / decrease of the leakage current resistive component of the B-phase arrester with a grading ring.

[0103] S230. Determine a third leakage current capacitive component increase / decrease model and a third leakage current resistive component increase / decrease model according to a C-phase arrester with a grading ring leakage current phase diagram and C-phase arrester with a grading ring detection data.

[0104] Specifically, refer to Figure 4 It can be seen that Interference current With B phase bus voltage U B Vertical, C phase bus voltage U C With B phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the C phase arrester with grading ring Leading C phase voltage UC The angle is 30° to detect leakage current The C phase bus voltage U C Vertical component and target leakage current The C phase bus voltage U C The difference in the vertical components is equal to the interference current The C phase bus voltage U C The vertical component can reflect the increase or decrease of the capacitive component of the leakage current of the C-phase arrester with a grading ring; the target leakage current The C phase bus voltage U C Components and detection leakage current The C phase bus voltage U C The difference of the components is equal to the interference current The C phase bus voltage U C The component can reflect the increase or decrease of the resistive component of the leakage current of the C phase arrester with grading ring.

[0105] Therefore, the third leakage current capacitive component increase / decrease model can be determined according to the increase / decrease of the leakage current capacitive component of the C-phase arrester with a grading ring; the third leakage current resistive component increase / decrease model can be determined according to the increase / decrease of the leakage current resistive component of the C-phase arrester with a grading ring.

[0106] S240. Determine an equivalent model of the capacitive component of the leakage current according to the leakage current characteristics.

[0107] Among them, since the model and structure of each phase arrester with a grading ring are the same, according to the leakage current characteristics, it can be known that the capacitive component of the leakage current of each phase arrester with a grading ring is equal, thereby obtaining a leakage current capacitive component equal model.

[0108] S250. Obtain leakage current characteristic parameters of a three-phase arrester with a grading ring according to a first leakage current capacitive component increase / decrease model, a first leakage current resistive component increase / decrease model, a second leakage current capacitive component increase / decrease model, a second leakage current resistive component increase / decrease model, a third leakage current capacitive component increase / decrease model, a third leakage current resistive component increase / decrease model, and a leakage current capacitive component equalization model.

[0109] Specifically, the first leakage current capacitive component increase / decrease model, the first leakage current resistive component increase / decrease model, the second leakage current capacitive component increase / decrease model, the second leakage current resistive component increase / decrease model, the third leakage current capacitive component increase / decrease model, the third leakage current resistive component increase / decrease model and the equivalent model of the leakage current capacitive component are combined and solved to obtain the leakage current characteristic parameters.

[0110] In addition, it should be noted that: the interference current of the A phase with grading ring arrester The interference current value of the C phase grading ring arrester The interference current value of the B phase with a grading ring arrester The interference current value and the interference current of the B phase arrester with grading ring The interference current values ​​are equal.

[0111] On the basis of the above embodiment, optionally, the detection data of the A-phase arrester with a grading ring includes the A-phase detection leakage current value and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage;

[0112] The increase and decrease model of the capacitive component of the first leakage current is:

[0113]

[0114] The increase and decrease model of the resistive component of the first leakage current is:

[0115]

[0116] Among them, I a1 is the leakage current value detected for phase A, is the detection angle of phase A, I A1 is the target leakage current value of the A-phase arrester with a grading ring (the scalar value of the target leakage current of the A-phase arrester with a grading ring), is the target interference angle of phase A that the target leakage current of phase A arrester with grading ring leads the bus voltage of phase A, I x1 It is the interference current value of the A-phase arrester with a grading ring (the scalar value of the interference current of the A-phase arrester with a grading ring).

[0117] On the basis of the above embodiment, optionally, the detection data of the C-phase arrester with a grading ring includes a C-phase detection leakage current value and a C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage;

[0118] The increase and decrease model of the third leakage current capacitive component is:

[0119]

[0120] The increase and decrease model of the resistive component of the third leakage current is:

[0121]

[0122] Among them, I c1 is the leakage current value detected for phase C, is the C phase detection angle, I C1 is the target leakage current value of the C-phase arrester with a grading ring (the scalar value of the target leakage current of the C-phase arrester with a grading ring), The target leakage current value of the C-phase arrester with a grading ring leads the C-phase bus voltage. I x2 It is the interference current value of the C phase arrester with grading ring (the scalar value of the interference current of the C phase arrester with grading ring).

[0123] On the basis of the above embodiment, optionally, the detection data of the B-phase arrester with a grading ring includes a B-phase detection leakage current value and a B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage;

[0124] The increase and decrease model of the capacitive component of the second leakage current is:

[0125]

[0126] The increase and decrease model of the resistive component of the second leakage current is:

[0127]

[0128] Among them, I b1 is the leakage current value detected for phase B, is the detection angle of phase B, I B1 is the target leakage current value of the arrester with grading ring on phase B (the scalar value of the target leakage current of the arrester with grading ring on phase B), is the target interference angle of phase B that the target leakage current of phase B arrester with grading ring leads the bus voltage of phase B, I x3 and I x4 They are all interference current values ​​of the B-phase arrester with a grading ring (scalar values ​​of the interference current of the B-phase arrester with a grading ring).

[0129] In addition, the interference current value I of the A phase arrester with grading ring is x1 , the interference current value I of the C phase arrester with grading ring x2 And the interference current value I of the B phase arrester with grading ring x3 and I x4 Are equal.

[0130] On the basis of the above embodiment, optionally, the equivalent model of the capacitive component of the leakage current includes an equivalent model of the capacitive component of the leakage current of phase A and phase B and an equivalent model of the capacitive component of the leakage current of phase A and phase C;

[0131] The equivalent model of the capacitive component of the leakage current of phase A and phase B is:

[0132]

[0133] The equivalent model of the capacitive component of the leakage current of phase A and phase C is:

[0134]

[0135] Among them, I A1 is the target leakage current value of the A-phase arrester with grading ring, is the target interference angle of phase A that the target leakage current of phase A arrester with grading ring leads the bus voltage of phase A, I C1 is the target leakage current value of the C phase arrester with grading ring, is the C-phase target interference angle at which the target leakage current of the C-phase arrester with a grading ring leads the C-phase bus voltage, I B1 is the target leakage current value of the B-phase arrester with grading ring, The B-phase target angle that the target leakage current of the B-phase grading ring arrester leads the B-phase bus voltage.

[0136] Based on the above embodiments, optionally, the leakage current characteristic parameters include the resistive component of the A-phase leakage current of the A-phase with a grading ring arrester, the resistive component of the B-phase leakage current of the B-phase with a grading ring arrester, the resistive component of the C-phase leakage current of the C-phase with a grading ring arrester, the A-phase target interference angle of the target leakage current of the A-phase with a grading ring arrester leading the A-phase bus voltage, the B-phase target interference angle of the target leakage current of the B-phase with a grading ring arrester leading the B-phase bus voltage, and the C-phase target interference angle of the target leakage current of the C-phase with a grading ring arrester leading the C-phase bus voltage.

[0137] Specifically, the resistive component of the A phase leakage current I AR for:

[0138]

[0139] The resistive component of the B phase leakage current I BR for:

[0140]

[0141] The resistive component of the C phase leakage current is:

[0142]

[0143] Phase A target interference angle for:

[0144]

[0145] Phase B target interference angle for:

[0146]

[0147] C-phase target interference angle for:

[0148]

[0149] Among them, I a1 is the leakage current value detected for phase A, is the detection angle of phase A, I c1 is the leakage current value detected for phase C, is the C phase detection angle, I b1 is the leakage current value detected for phase B, is the B phase detection angle.

[0150] Figure 7 A schematic diagram of a detection device for a three-phase arrester with a grading ring provided in an embodiment of the present invention is shown in FIG. Figure 7 As shown, the detection device of the three-phase arrester with grading ring includes:

[0151] An acquisition module 710 is used to acquire detection data of a three-phase arrester with a grading ring;

[0152] The leakage current characteristic parameter determination module 720 is used to determine the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the arrester with a grading ring, the leakage current characteristics of the arrester with a grading ring and the detection data;

[0153] The state determination module 730 is used to determine the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the arrester with a grading ring.

[0154] The embodiment of the present invention obtains the detection data of the three-phase arrester with a grading ring through the acquisition module 710; the leakage current characteristic parameter determination module 720 determines the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the arrester with a grading ring, the leakage current characteristics of the arrester with a grading ring and the detection data; the state determination module 730 determines the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the arrester with a grading ring. Therefore, this scheme can accurately obtain the leakage current characteristic parameters of the three-phase arrester with a grading ring, and then accurately determine the insulation state of the three-phase arrester.

[0155] On the basis of the above embodiment, optionally, the detection data includes detection data of a lightning arrester with a voltage-grading ring of phase A, detection data of a lightning arrester with a voltage-grading ring of phase B, and detection data of a lightning arrester with a voltage-grading ring of phase C;

[0156] The leakage current characteristic parameter determination module includes:

[0157] A first model determination unit is used to determine a first leakage current capacitive component increase / decrease model and a first leakage current resistive component increase / decrease amount model according to a leakage current phase diagram of the A-phase arrester with a grading ring and detection data of the A-phase arrester with a grading ring;

[0158] The second model determination unit is used to determine the second leakage current capacitive component increase / decrease model and the second leakage current resistive component increase / decrease model according to the B-phase grading ring arrester leakage current phase diagram and the B-phase grading ring arrester detection data;

[0159] A third model determination unit is used to determine a third leakage current capacitive component increase / decrease model and a third leakage current resistive component increase / decrease model according to a C-phase grading ring arrester leakage current phase diagram and C-phase grading ring arrester detection data;

[0160] A fourth model determination unit, used to determine a model equivalent to a capacitive component of a leakage current according to the leakage current characteristics;

[0161] A calculation unit is used to obtain the leakage current characteristic parameters of a three-phase arrester with a grading ring according to a first leakage current capacitive component increase / decrease model, a first leakage current resistive component increase / decrease model, a second leakage current capacitive component increase / decrease model, a second leakage current resistive component increase / decrease model, a third leakage current capacitive component increase / decrease model, a third leakage current resistive component increase / decrease model, and a leakage current capacitive component equalization model.

[0162] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0163] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection method for a three-phase arrester with a grading ring, characterized in that: include: Obtaining detection data of the three-phase arrester with grading ring; Determine the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the three-phase arrester with a grading ring, the leakage current characteristics of the three-phase arrester with a grading ring and the detection data; According to the leakage current characteristic parameters of the three-phase arrester with a grading ring, the insulation state of the three-phase arrester with a grading ring is determined.

2. The detection method of the grading ring arrester according to claim 1 is characterized in that: The three-phase arrester with a grading ring includes an arrester with a grading ring for phase A, an arrester with a grading ring for phase B, and an arrester with a grading ring for phase C; The phase diagram includes a leakage current phase diagram of a surge arrester with a grading ring in phase A, a leakage current phase diagram of a surge arrester with a grading ring in phase B, and a leakage current phase diagram of a surge arrester with a grading ring in phase C; The A-phase arrester with a grading ring leakage current phase diagram is a phase diagram between the detection leakage current, the target leakage current and the interference current of the A-phase arrester with a grading ring; The B-phase arrester with a grading ring leakage current phase diagram is a phase diagram between the detection leakage current, the target leakage current and the interference current of the B-phase arrester with a grading ring; The C-phase arrester with a grading ring leakage current phase diagram is a phase diagram between the detection leakage current, the target leakage current and the interference current of the C-phase arrester with a grading ring.

3. The detection method of the grading ring arrester according to claim 2 is characterized in that: The detection data includes detection data of the arrester with a voltage-grading ring on phase A, detection data of the arrester with a voltage-grading ring on phase B, and detection data of the arrester with a voltage-grading ring on phase C; The step of determining the leakage current characteristic parameters of the three-phase arrester with a grading ring comprises: Determine a first leakage current capacitive component increase / decrease model and a first leakage current resistive component increase / decrease model according to the A-phase arrester with a grading ring leakage current phase diagram and the A-phase arrester with a grading ring detection data; Determine a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model according to the B-phase arrester with grading ring leakage current phase diagram and the B-phase arrester with grading ring detection data; Determine a third leakage current capacitive component increase / decrease model and a third leakage current resistive component increase / decrease model according to the C-phase arrester with grading ring leakage current phase diagram and the C-phase arrester with grading ring detection data; Determining a capacitive component equivalent model of the leakage current according to the leakage current characteristics; According to the first leakage current capacitive component increase / decrease model, the first leakage current resistive component increase / decrease model, the second leakage current capacitive component increase / decrease model, the second leakage current resistive component increase / decrease model, the third leakage current capacitive component increase / decrease model, the third leakage current resistive component increase / decrease model and the leakage current capacitive component equalization model, the leakage current characteristic parameters of the three-phase arrester with grading ring are obtained.

4. The detection method of the grading ring arrester according to claim 3 is characterized in that: The detection data of the A-phase arrester with a grading ring includes the A-phase detection leakage current value and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage; The increase and decrease model of the capacitive component of the first leakage current is: The increase and decrease model of the resistive component of the first leakage current is: Among them, I a1 Detecting leakage current value for phase A, is the A phase detection angle, I A1 is the target leakage current value of the A-phase arrester with grading ring, The target leakage current of the A-phase arrester with a grading ring leads the A-phase bus voltage by the target interference angle of the A-phase, I x1 is the interference current value of the A phase arrester with grading ring.

5. The detection method of the grading ring arrester according to claim 4 is characterized in that: The C-phase arrester with grading ring detection data includes the C-phase detection leakage current value and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage; The increase and decrease model of the third leakage current capacitive component is: The increase and decrease model of the resistive component of the third leakage current is: Among them, I c1 Detecting leakage current value for the C phase, is the C phase detection angle, I C1 is the target leakage current value of the C-phase arrester with grading ring, is the C-phase target interference angle at which the target leakage current of the C-phase arrester with a grading ring leads the C-phase bus voltage, I x2 is the interference current value of the C phase arrester with grading ring.

6. The detection method of the grading ring arrester according to claim 5 is characterized in that: The detection data of the B-phase arrester with a grading ring includes a B-phase detection leakage current value and a B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage; The increase and decrease model of the capacitive component of the second leakage current is: The increase and decrease model of the resistive component of the second leakage current is: Among them, I b1 Detecting leakage current value for the B phase, is the B phase detection angle, I B1 is the target leakage current value of the B-phase arrester with grading ring, is the target interference angle of the B phase that the target leakage current of the B phase arrester with grading ring leads the B phase bus voltage, I x3 and I x4 All are the interference current values ​​of the B-phase arrester with grading ring; The interference current value I of the A phase arrester with grading ring x1 , the interference current value I of the C phase arrester with grading ring x2 And the interference current value I of the B phase arrester with grading ring x3 and I x4 Are equal.

7. The detection method of the grading ring arrester according to claim 6 is characterized in that: The leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model and an A-phase and C-phase leakage current capacitive component equivalent model; The equivalent model of the capacitive component of the A-phase and B-phase leakage current is: The equivalent model of the capacitive component of the A-phase and C-phase leakage current is: Among them, I A1 is the target leakage current value of the A-phase arrester with grading ring, The target leakage current of the A-phase arrester with a grading ring leads the A-phase bus voltage by the target interference angle of the A-phase, I C1 is the target leakage current value of the C-phase arrester with grading ring, is the C-phase target interference angle at which the target leakage current of the C-phase arrester with a grading ring leads the C-phase bus voltage, I B1 is the target leakage current value of the B-phase arrester with grading ring, The B-phase target angle that the target leakage current of the B-phase grading ring arrester leads the B-phase bus voltage.

8. The detection method of the grading ring arrester according to claim 7 is characterized in that: The leakage current characteristic parameters include the resistive component of the A-phase leakage current of the A-phase with a grading ring arrester, the resistive component of the B-phase leakage current of the B-phase with a grading ring arrester, the resistive component of the C-phase leakage current of the C-phase with a grading ring arrester, the A-phase target interference angle of the target leakage current of the A-phase with a grading ring arrester leading the A-phase bus voltage, the B-phase target interference angle of the target leakage current of the B-phase with a grading ring arrester leading the B-phase bus voltage, and the C-phase target interference angle of the target leakage current of the C-phase with a grading ring arrester leading the C-phase bus voltage.

9. The detection method of the grading ring arrester according to claim 8 is characterized in that: The A phase leakage current resistive component I AR for: The B phase leakage current resistive component I BR for: The resistive component of the C phase leakage current is: The A-phase target interference angle for: The B-phase target interference angle for: The C-phase target interference angle for: Among them, I a1 Detecting leakage current value for phase A, is the A phase detection angle, I c1 Detecting leakage current value for the C phase, is the C phase detection angle, I b1 Detecting leakage current value for the B phase, is the B phase detection angle.

10. A detection device for a three-phase arrester with a grading ring, characterized in that: include: An acquisition module, used for acquiring detection data of the three-phase arrester with grading ring; A leakage current characteristic parameter determination module, used to determine the leakage current characteristic parameters of the three-phase arrester with a grading ring according to the phase diagram of the three-phase arrester with a grading ring, the leakage current characteristics of the three-phase arrester with a grading ring and the detection data; A state determination module is used to determine the insulation state of the three-phase arrester with a grading ring according to the leakage current characteristic parameters of the three-phase arrester with a grading ring.

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