Electrode structure and capacitive voltage sensor

Abstract

The utility model relates to the technical field of voltage sensors, and discloses an electrode structure and a capacitive voltage sensor, and the electrode structure comprises a grounding electrode which is of a semicircular hollow structure, and the inner circular surface of the grounding electrode is provided with a first opening; the induction electrode is of a semi-annular hollow structure, and a second opening is formed in the outer circle face of the induction electrode; the induction electrode is embedded in a hollow cavity formed by the grounding electrode, and the first opening and the second opening are opposite in direction. The grounding electrode and the induction electrode are both of a semicircular hollow structure, the edge of the formed electrode structure is of a circular structure, and no sharp corner exists at the edge, so that the influence of the electrode shape on the electric field distribution at the edge is reduced, the edge negative effect is reduced, and the measurement sensitivity of the capacitive voltage sensor is improved; the induction electrode is embedded in the grounding electrode, so that an electric field radiated from the edge of the induction electrode can be completely absorbed by the grounding electrode, external interference can be shielded, and the measurement precision of the capacitive voltage sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage sensors, in particular to an electrode structure and a capacitive voltage sensor. Background Art

[0002] Wind farm collector cable fault diagnosis technology is a topic that continues to be discussed in the intelligent operation and maintenance of collector lines, in which voltage measurement is the basis for judging whether the line has tripped. Capacitive voltage sensors use the principle of electric field coupling to measure line voltage, avoiding direct contact with collector cables and solving the safety issues caused by contact sensors. They also have the advantages of small size, simple structure and high resolution. With the appropriate processing circuit, they can achieve high-frequency and high-voltage measurements and are widely used in voltage measurement technology.

[0003] There are sharp corners at the edge of the electrode of the capacitive voltage sensor. Due to the limitation of the electrode shape, the electric field lines extend from the area between the plates to the external space. The electric field lines change from parallel lines to open distribution. The electric field lines are concentrated at the edge of the plate, resulting in uneven distribution of the electric field of the entire plate. This phenomenon is called edge effect. The edge effect causes the sensor sensitivity to decrease. At the same time, the electric field at the edge radiates to the outside world, which will cause the sensor measurement accuracy to decrease, making the system have worse characteristics and producing edge negative effects. Utility Model Content

[0004] In view of this, the utility model provides an electrode structure and a capacitive voltage sensor to solve the problem that the measurement accuracy of the capacitive voltage sensor is reduced due to the sharp corners at the edge of the electrode.

[0005] In a first aspect, the utility model provides an electrode structure, comprising:

[0006] The grounding electrode is a semicircular hollow structure, and the inner circular surface of the grounding electrode has a first opening;

[0007] The sensing electrode is a semicircular hollow structure, and the outer circumferential surface of the sensing electrode has a second opening;

[0008] The sensing electrode is embedded in the hollow chamber formed by the ground electrode, and the first opening and the second opening are in opposite directions.

[0009] Beneficial effects: Both the grounding electrode and the sensing electrode are semicircular hollow structures, and the sensing electrode is embedded and sleeved in the hollow cavity formed by the grounding electrode, so that the edge of the electrode structure is a circular structure. Since there are no sharp corners at the edge, the influence of the electrode shape on the electric field distribution at the edge is reduced, the negative edge effect is reduced, and the measurement sensitivity of the capacitive voltage sensor is improved; and the sensing electrode is embedded in the grounding electrode, so that the electric field radiated from the edge of the sensing electrode can be completely absorbed by the grounding electrode, and it can also shield external interference, thereby improving the measurement accuracy of the capacitive voltage sensor.

[0010] In an optional implementation, a plastic insulating layer is filled between the ground electrode and the sensing electrode.

[0011] Beneficial effect: The plastic insulating layer is filled between the ground electrode and the sensing electrode to insulate the ground electrode and the sensing electrode. At the same time, the two are connected as one and reliably fixed through the plastic insulating layer, and the structure is more compact.

[0012] In an optional embodiment, metal closed covers are provided at both ends of the ground electrode.

[0013] Beneficial effect: The two ends of the electrode are sealed by a metal sealing cover, and the metal material ensures the formation of a complete metal outer layer and is also isolated from the outside world.

[0014] In an optional implementation, the wall thickness of the outer circumferential surface of the ground electrode is T1, the wall thickness of the inner circumferential surface of the sensing electrode is T2, and T1=T2.

[0015] Beneficial effect: The wall thickness at the outer circumference of the ground electrode is the same as the wall thickness at the inner circumference of the induction electrode, which reduces the influence of thickness on the electric field distribution at the edge, makes the electric field more uniform, and improves the consistency of the electric field.

[0016] In an optional implementation, the wall thickness of the ground electrode side wall is T3, the wall thickness of the sensing electrode side wall is T4, and T3=T4.

[0017] Beneficial effect: The thickness of the side wall of the ground electrode is the same as that of the side wall of the induction electrode, which reduces the influence of thickness on the electric field distribution at the edge, does not produce drastic changes, and has good electric field consistency.

[0018] In an optional implementation, the insulating layer is an epoxy resin potting layer.

[0019] Beneficial effects: The epoxy resin potting layer is used to insulate the ground electrode and the sensing electrode, and the epoxy resin can be injection-molded into one body of the ground electrode and the sensing electrode, thereby improving the stability of the combination and the positioning reliability.

[0020] In an optional embodiment, the electrode structure further includes:

[0021] The shell is coated on the outer side of the electrode assembly formed by the ground electrode and the sensing electrode.

[0022] Beneficial effect: The outer side of the electrode assembly formed by the ground electrode and the induction electrode is covered with a shell for protection, which also ensures the aesthetic appearance.

[0023] In a second aspect, the utility model further provides a capacitive voltage sensor, comprising:

[0024] Connecting structures;

[0025] The electrode structure described in any one of the above items, and the number of the electrode structures is two, the two electrode structures can be arranged relatively to each other in an openable and closable manner through the connecting structure to form a circular ring shape.

[0026] Beneficial effects: The two electrode structures can be opened and closed through the connection structure, which is simple to install and easy to operate.

[0027] In an optional embodiment, the connection structure includes a folding buckle.

[0028] Beneficial effects: The two electrode structures are connected by folding buckles, which are easy to install and easy to open and close.

[0029] In an optional implementation, the electrode structure is externally connected to a coaxial cable via a lead, and an explosion-proof joint is provided at the junction of the coaxial cable and the electrode structure.

[0030] Beneficial effect: The method of arranging explosion-proof joints at the joints improves the safety level of the capacitive voltage sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 A three-dimensional diagram of an electrode structure according to an embodiment of the utility model;

[0033] Figure 2 for Figure 1 Structural diagram of the ground electrode in the middle electrode structure;

[0034] Figure 3 for Figure 1Structural diagram of the sensing electrode of the middle electrode structure;

[0035] Figure 4 This is a schematic diagram of the structure of an electrode structure according to an embodiment of the utility model after a metal closed cover is added;

[0036] Figure 5 A schematic cross-sectional view of a ground electrode and a sensing electrode according to an embodiment of the present utility model;

[0037] Figure 6 A cross-sectional structural diagram of a capacitive voltage sensor according to an embodiment of the utility model;

[0038] Figure 7 This is a front view of a capacitive voltage sensor according to an embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 1. Ground electrode;

[0041] 2. Sensing electrode;

[0042] 3. Insulation layer;

[0043] 4. Metal closed cover;

[0044] 51. threaded hole; 52. bolt;

[0045] 6. Lead wire;

[0046] 7. Connection structure;

[0047] 8. Explosion-proof joint;

[0048] 9. Coaxial cable. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0050] In the description of the utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0052] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0053] According to an embodiment of the present utility model, on the one hand, as Figure 1 As shown, an electrode structure is provided, comprising:

[0054] like Figure 2 The ground electrode 1 shown is a semicircular hollow structure, and the inner circular surface of the ground electrode 1 has a first opening;

[0055] like Figure 3 The sensing electrode 2 shown is a semicircular hollow structure, and the outer circumferential surface of the sensing electrode 2 has a second opening;

[0056] The sensing electrode 2 is embedded in the hollow chamber formed by the grounding electrode 1 , and the first opening and the second opening face oppositely.

[0057] The grounding electrode 1 and the sensing electrode 2 are both semicircular hollow structures, and the sensing electrode 2 is embedded and sleeved in the hollow cavity formed by the grounding electrode 1, so that the edge of the electrode structure is a circular structure. Since there are no sharp corners at the edge, the influence of the electrode shape and thickness on the electric field distribution at the edge is reduced, the negative edge effect is reduced, and the measurement sensitivity of the capacitive voltage sensor is improved; and the sensing electrode 2 is embedded in the grounding electrode 1, so that the electric field radiated from the edge of the sensing electrode 2 can be completely absorbed by the grounding electrode 1, and it can also shield external interference, thereby improving the measurement accuracy of the capacitive voltage sensor.

[0058] It should be noted that both the ground electrode 1 and the sensing electrode 2 use a non-metallic skeleton, the skeleton is a semicircular hollow structure, the inner circumferential surface of the skeleton of the ground electrode 1 has a first opening, and the outer circumferential surface of the skeleton of the sensing electrode 2 has a second opening, and a layer of metal is plated on the surface of the skeleton to form a metal electrode.

[0059] In one embodiment, Figure 1 and Figure 6 As shown, a plastic insulating layer 3 is filled between the ground electrode 1 and the sensing electrode 2 .

[0060] A plastic insulating layer 3 is filled between the ground electrode 1 and the sensing electrode 2 to insulate the ground electrode 1 and the sensing electrode 2 . At the same time, the two are connected as one and reliably fixed through the plastic insulating layer 3 , and the structure is more compact.

[0061] In one embodiment, Figure 4 As shown, metal closed covers 4 are provided at both ends of the ground electrode 1 .

[0062] The two ends of the electrode are sealed by a metal sealing cover 4. The metal sealing cover ensures the formation of a complete metal outer layer and also isolates the interior of the electrode structure from the outside.

[0063] In one embodiment, Figure 5 As shown, the wall thickness at the outer circumference of the ground electrode 1 is T1, the wall thickness at the inner circumference of the sensing electrode 2 is T2, and T1=T2.

[0064] The wall thickness at the outer circumference of the ground electrode 1 is the same as the wall thickness at the inner circumference of the sensing electrode 2 , which reduces the influence of thickness on the electric field distribution at the edge, making the electric field more uniform and having good consistency.

[0065] In one embodiment, the thickness of the side wall of the ground electrode 1 is T3, the thickness of the side wall of the sensing electrode 2 is T4, and T3=T4.

[0066] The thickness of the side wall of the ground electrode 1 is the same as that of the side wall of the sensing electrode 2 , which reduces the influence of thickness on the electric field distribution at the edge, does not produce drastic changes, and has good electric field consistency.

[0067] When the sensing electrode 2 is embedded in the grounding electrode 1, it is necessary to ensure that the outer contour of the inner circular surface of the sensing electrode 2 is located inside the grounding electrode 1. This configuration allows the electric field radiated from the edge of the sensing electrode 2 to be completely absorbed by the grounding electrode 1, and the vertical distance between the grounding electrode 1 and the sensing electrode 2 is equal everywhere, which can also ensure the uniformity of the electric field.

[0068] In one embodiment, the insulating layer 3 is an epoxy resin potting layer.

[0069] The ground electrode 1 and the sensing electrode 2 are insulated by a plastic epoxy resin potting layer, and the epoxy resin can be injection-molded into one body of the ground electrode 1 and the sensing electrode 2, thereby improving the stability of the combination and the positioning reliability between the ground electrode 1 and the sensing electrode 2 is also high.

[0070] In one embodiment, Figure 6 As shown, the electrode structure also includes:

[0071] The shell is coated on the outer side of the electrode assembly formed by the ground electrode 1 and the sensing electrode 2 .

[0072] The outer side of the electrode assembly formed by the ground electrode 1 and the sensing electrode 2 is covered with a shell for protection, which also ensures the aesthetic appearance.

[0073] Specifically, a flame retardant ABS plastic shell can be used.

[0074] In a second aspect, the utility model further provides a capacitive voltage sensor, comprising:

[0075] Connecting structure 7;

[0076] Electrode structure: there are two electrode structures, and the two electrode structures can be arranged opposite to each other in an openable and closable manner through a connecting structure 7 to form a circular ring shape.

[0077] The two electrode structures can be opened and closed through the connection structure 7, which is simple to install and easy to operate.

[0078] Specifically, Figure 7 As shown, the connection structure 7 includes a folding buckle.

[0079] The two electrode structures are connected by a folding buckle, which is simple to install and easy to open and close.

[0080] In some other embodiments, other connection methods such as threaded connection may also be used, which can be selected according to needs.

[0081] In one embodiment, the electrode structure is externally connected to a coaxial cable 9 via a lead 6 , the two leads 6 are respectively connected to the sensing electrode 2 and the grounding electrode 1 , and an explosion-proof joint 8 is provided at the junction of the coaxial cable 9 and the electrode structure.

[0082] The method of arranging the explosion-proof joint 8 at the joint improves the safety level of the capacitive voltage sensor.

[0083] Install the folding buckle, then install the coaxial cable 9 to lead out the electrode lead 6, close the housing and tighten the bolt 52 installed in the threaded hole 51 to form an open-close capacitive voltage sensor. Figure 7 .

[0084] After the capacitive voltage sensor of the utility model is adopted in the wind farm collector cable, the influence of the edge negative effect can be reduced, the measurement accuracy of the sensor can be improved, and the improvement of the voltage measurement accuracy can enhance the reliability of the fault diagnosis of the wind farm collector cable.

[0085] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An electrode structure, characterized in that: include: The grounding electrode (1) is a semicircular hollow structure, and the inner circular surface of the grounding electrode (1) has a first opening; The sensing electrode (2) is in the form of a semicircular hollow structure, and the outer circumferential surface of the sensing electrode (2) has a second opening; The sensing electrode (2) is embedded in a hollow chamber formed by the grounding electrode (1), and the first opening and the second opening are oriented in opposite directions.

2. The electrode structure according to claim 1, characterized in that: A plastic insulating layer (3) is filled between the ground electrode (1) and the sensing electrode (2).

3. The electrode structure according to claim 1, characterized in that: Metal closed covers (4) are provided at both ends of the grounding electrode (1).

4. The electrode structure according to claim 1, characterized in that: The wall thickness of the outer circumferential surface of the grounding electrode (1) is T1, the wall thickness of the inner circumferential surface of the sensing electrode (2) is T2, and T1=T2.

5. The electrode structure according to claim 1, characterized in that: The thickness of the side wall of the grounding electrode (1) is T3, the thickness of the side wall of the sensing electrode (2) is T4, and T3=T4.

6. The electrode structure according to claim 2, characterized in that: The insulating layer (3) is an epoxy resin glue-filled layer.

7. The electrode structure according to any one of claims 1 to 6, characterized in that: The electrode structure further comprises: The shell is coated on the outside of the electrode assembly formed by the ground electrode (1) and the sensing electrode (2).

8. A capacitive voltage sensor, characterized in that: include: Connecting structure (7); The electrode structure according to any one of claims 1 to 7, wherein the number of the electrode structures is two, and the two electrode structures can be arranged relative to each other in an openable and closable manner through the connecting structure (7) to form a circular ring shape.

9. The capacitive voltage sensor according to claim 8, characterized in that: The connection structure (7) comprises a foldable buckle.

10. The capacitive voltage sensor according to claim 8, characterized in that: The electrode structure is externally connected to a coaxial cable (9) via a lead wire (6), and an explosion-proof joint (8) is provided at the junction of the coaxial cable (9) and the electrode structure.

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