Composite sensor for monitoring partial discharge of high-voltage switch cabinet

Abstract

The utility model provides a composite sensor for partial discharge monitoring of a high-voltage switch cabinet, and the sensor comprises a housing which comprises an upper cover and a bottom plate buckled on the upper cover, so as to form a closed installation space; the monitoring unit comprises an ultrasonic sensor arranged on the upper cover, a TEV sensor arranged on the bottom plate and a control circuit board arranged in the mounting space, and the ultrasonic sensor and the TEV sensor are electrically connected with the control circuit board; and the connecting unit is arranged between the upper cover and the bottom plate and is used for connecting the upper cover and the bottom plate so as to close or open the mounting space. Transient ground voltage and ultrasonic signals in the high-voltage switch cabinet are monitored in real time through the TEV sensor, the ultrasonic sensor and the radio frequency receiving coil, safety and multiple guarantees in the high-voltage switch cabinet are guaranteed, the probability of missing report of partial discharge is reduced, partial discharge monitoring is more accurate, sensitivity and reliability are high, the integrated design occupies a small space, and the cost is low. The installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of partial discharge monitoring sensors, in particular to a composite sensor for partial discharge monitoring of a high-voltage switch cabinet. Background Art

[0002] Switchgear plays a very important role in the power supply and distribution system, and its operating reliability directly affects the normal production of the power industry. However, during operation, these devices are inevitably affected by various factors such as electricity, heat, machinery and environment, and their insulation medium continues to deteriorate, resulting in poor operating conditions and even various failures, causing local or even large-scale power outages, resulting in huge direct and indirect economic losses and social impacts.

[0003] Before various insulation defects develop into final breakdown and cause accidents, they often go through the partial discharge stage. The strength of partial discharge can timely reflect the current insulation status of the equipment. Therefore, real-time monitoring of partial discharge can effectively prevent and diagnose switch cabinet insulation failures. At present, the market often uses a single sensor for monitoring, which has low monitoring precision and poor accuracy. In addition, when installing multiple sensors, it is also limited by space and inconvenient to use. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a composite sensor for partial discharge monitoring of high-voltage switch cabinets, which solves the problems of low precision and poor accuracy when using a single sensor for monitoring in the prior art, as well as space limitations when installing multiple sensors.

[0005] According to the embodiment of the utility model, the utility model adopts the following technical solution:

[0006] A composite sensor for partial discharge monitoring of a high-voltage switch cabinet, comprising:

[0007] The housing comprises an upper cover and a bottom plate buckled with the upper cover to form a closed installation space;

[0008] A monitoring unit, comprising an ultrasonic sensor disposed on the upper cover, a TEV sensor disposed on the bottom plate, and a control circuit board disposed in the installation space, wherein the ultrasonic sensor and the TEV sensor are both electrically connected to the control circuit board; and

[0009] The connecting unit is arranged between the upper cover and the bottom plate, and is used to connect the upper cover and the bottom plate to close or open the installation space.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In this solution, a shell with an installation space is formed by an upper cover and a bottom plate, the ultrasonic sensor and the TEV sensor in the monitoring unit are respectively installed on the upper cover and the bottom plate, and the control circuit board for transmitting signals is installed in the installation space to transmit the signals given by the ultrasonic sensor and the TEV sensor, and the transient ground voltage and ultrasonic signal in the high-voltage switch cabinet are monitored in real time to ensure the safety in the high-voltage switch cabinet. The multiple guarantees reduce the probability of missed reporting of partial discharge, make partial discharge monitoring more accurate, have high sensitivity and reliability, and the integrated design occupies less space and is easy to install. Secondly, with the support of the connection unit, the initial assembly of the shell is convenient, and it is also convenient to disassemble the shell for maintenance of various internal components later, which is convenient for maintenance and ensures a certain service life.

[0012] Preferably, the connecting unit includes at least one elastic block and a clamping portion arranged on the elastic block, the bottom plate is provided with a mounting groove, the end of the elastic block is fixedly arranged in the mounting groove, the side of the upper cover is provided with a clamping groove, and when the upper cover is buckled onto the bottom plate, the clamping portion is clamped in the clamping groove.

[0013] Preferably, the clamping portion is a wedge-shaped block, and the clamping groove is a wedge-shaped groove.

[0014] Preferably, an end portion of the elastic block close to the clamping portion extends upward to form an operating portion, and the operating portion and the elastic block form an angle.

[0015] Preferably, a positioning portion is provided at the bottom of the upper cover, and when the upper cover is buckled onto the bottom plate, the positioning portion is snap-connected to the bottom plate.

[0016] Preferably, the bottom plate is provided with a plurality of honeycomb holes.

[0017] Preferably, the upper cover is provided with a conical opening corresponding to the ultrasonic sensor, and the large end of the conical opening is close to the upper end surface of the upper cover.

[0018] Preferably, a protective layer is provided on the upper end surface of the upper cover.

[0019] Preferably, the upper cover is made of hard aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the utility model.

[0021] Figure 2 It is a bottom view structural schematic diagram of an embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the upper cover in the embodiment of the utility model.

[0023] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of area A in the middle.

[0024] In the above drawings: 1. upper cover; 2. bottom plate; 3. protective layer; 4. honeycomb hole; 5. TEV sensor; 6. control circuit board; 7. conical mouth; 8. positioning part; 9. clamping part; 10. elastic block; 11. operating part; 12. clamping groove; 13. installation groove; 14. ultrasonic sensor. DETAILED DESCRIPTION

[0025] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figures 1 to 3 As shown, the embodiment of the utility model proposes a composite sensor for partial discharge monitoring of a high-voltage switch cabinet, comprising:

[0027] The housing comprises an upper cover 1 and a bottom plate 2 buckled on the upper cover 1 to form a closed installation space;

[0028] A monitoring unit, comprising an ultrasonic sensor 14 disposed on the upper cover 1, a TEV sensor 5 disposed on the bottom plate 2, and a control circuit board 6 disposed in the installation space, wherein the ultrasonic sensor 14 and the TEV sensor 5 are both electrically connected to the control circuit board 6; and

[0029] The connection unit is disposed between the upper cover 1 and the bottom plate 2 and is used to connect the upper cover 1 and the bottom plate 2 to close or open the installation space.

[0030] In the embodiment of the utility model, the shell is formed by buckling an upper cover 1 and a bottom plate 2, and has a closed installation space after buckling. When installing the monitoring unit, the ultrasonic sensor 14 is installed on the upper cover 1, the TEV sensor 5 and its coupling circuit board are installed on the bottom plate 2, and the control circuit board 6 for transmitting signals is installed in the installation space to transmit the signals given by the ultrasonic sensor 14 and the TEV sensor 5, and monitor the transient ground voltage (TEV) and ultrasonic signals in the high-voltage switch cabinet in real time to ensure the safety in the high-voltage switch cabinet. The multiple guarantees reduce the probability of missed reporting of partial discharge, make partial discharge monitoring more accurate, have high sensitivity and reliability, and the integrated design occupies less space and is easy to install. When the above-mentioned TEV sensor 5 is working, the receiving range of the TEV signal is: 3M-80MHz, and when the above-mentioned ultrasonic sensor 14 is working, the receiving range of the ultrasonic signal is: 10k-150k. During installation, ensure that the receiving end of the ultrasonic sensor 14 points to the front to ensure the pointing accuracy of the sensor.

[0031] Secondly, in order to facilitate the initial assembly of the shell, under the action of the connecting unit, the upper cover 1 and the bottom plate 2 can be quickly fixed and connected to complete the rapid assembly of the TEV sensor 5, the bottom plate 2, the ultrasonic sensor 14, the upper cover 1 and the control circuit board 6, and it is also convenient to disassemble the shell later to maintain the internal components, which is convenient for operation.

[0032] Based on the above scheme, if Figure 4 As shown, the connecting unit includes at least one elastic block 10 and a clamping portion 9 arranged on the elastic block 10, the bottom plate 2 is provided with a mounting groove 13, the end of the elastic block 10 is fixedly arranged in the mounting groove 13, and a clamping groove 12 is provided on the side of the upper cover 1. When the upper cover 1 is buckled onto the bottom plate 2, the clamping portion 9 is clamped into the clamping groove 12. Specifically, when assembling the upper cover 1 and the bottom plate 2 through the connecting unit, first align the mouth of the upper cover 1 with the bottom plate 2, and pull the end of the elastic block 10 to deform it, so that the clamping portion 9 of the elastic block 10 and the clamping groove 12 are not on the same plane. When the upper cover 1 is fully engaged with the bottom plate 2, the clamping groove 12 on the side of the upper cover 1 is just aligned with the clamping portion 9 of the elastic block 10. Directly release the elastic block 10 to restore its deformation and drive the clamping portion 9 to clamp into the clamping groove 12 to achieve rapid fixation. In addition, in order to ensure the stability of the installation, two elastic blocks 10 can be used, and the two elastic blocks 10 can be installed on both sides of the bottom plate 2 to ensure stability.

[0033] Specifically, the clamping portion 9 is a wedge-shaped block, and the clamping groove 12 is a wedge-shaped groove. The wedge-shaped block has an inclined surface, and the inclination direction of the inclined surface is close to the mouth of the upper cover 1. Therefore, when connecting the bottom plate 2 and the upper cover 1, there is no need to adjust the elastic block 10. After the bottom plate 2 is placed on the table, the upper cover 1 is directly aligned with the bottom plate 2 and pressed down, so that the mouth of the upper cover 1 first squeezes the clamping portion 9 of the elastic block 10, so that the elastic block 10 deforms itself under the push of the force until the clamping portion 9 is aligned with the clamping groove 12. The elastic block 10 automatically allows the clamping portion 9 to be clamped into the clamping groove 12 under the premise of restoring the deformation, thereby simplifying the installation steps. Moreover, the end of the elastic block 10 close to the clamping portion 9 extends upward to form an operating portion 11, and the operating portion 11 forms an angle with the elastic block 10. When the upper cover 1 and the bottom plate 2 are subsequently disassembled, because the operating portion 11 forms an angle with the elastic block 10, there is a gap between the operating portion 11 and the side of the upper cover 1, which is convenient for fingers to enter for adjustment.

[0034] Specifically, Figure 4 As shown, a positioning portion 8 is provided at the bottom of the upper cover 1. When the upper cover 1 is buckled onto the bottom plate 2, the positioning portion 8 is snapped onto the bottom plate 2. Under the action of the positioning portion 8, the upper cover 1 can be positioned and installed in the bottom plate 2, and it is also ensured that the snap-in portion 9 is always aligned with the snap-in groove 12.

[0035] Based on the above scheme, if Figure 2 As shown, the bottom plate 2 is provided with a plurality of honeycomb holes 4, which are opened at the bottom of the bottom plate 2 and penetrate through the plurality of honeycomb holes 4, so that the bottom plate 2 presents a honeycomb shape, which not only reduces the overall mass, but also can reduce the coupling capacitance between the TEV coupling circuit board and the bottom plate 2.

[0036] Based on the above scheme, if Figure 3As shown, the upper cover 1 is provided with a conical opening 7 corresponding to the ultrasonic sensor 14. The large end of the conical opening 7 is close to the upper end surface of the upper cover 1, which can collect signals, enhance detection sensitivity, and make the signal reception have strong directionality, which is conducive to accurate monitoring of fault points. In addition, a radio frequency receiving coil can be installed in the conical opening 7. The radio frequency receiving coil is wound with 0.3-0.5 copper wire and has 3-5 turns. It is used to receive the radio frequency signal radiated from the internal space of the equipment to make up for the shortcomings of the TEV sensor 5 and the ultrasonic sensor 14 in signal collection, realize the triple protection of TVE, ultrasound, and radio frequency, reduce the probability of partial discharge underreporting, and make partial discharge monitoring more accurate. In addition, the upper cover 1 also has a connection port connected to the internal circuit board, which can be connected to an external partial discharge detection device.

[0037] Specifically, Figure 1 As shown, a protective layer 3 is provided on the upper end surface of the upper cover 1. The protective layer is made of a silicone rubber material or a foam, which can prevent the conductor part of the sensor from directly contacting the high-voltage part of the test object and ensure the overall insulation strength.

[0038] Specifically, Figure 1 As shown, the upper cover 1 is made of hard aluminum to ensure structural strength, and a black oxide film can be attached to its surface, while also taking into account aesthetics.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A composite sensor for partial discharge monitoring of high-voltage switch cabinet, characterized in that: include: The housing comprises an upper cover (1) and a bottom plate (2) buckled on the upper cover (1) to form a closed installation space; A monitoring unit, comprising an ultrasonic sensor (14) arranged on the upper cover (1), a TEV sensor (5) arranged on the bottom plate (2), and a control circuit board (6) arranged in the installation space, wherein the ultrasonic sensor (14) and the TEV sensor (5) are both electrically connected to the control circuit board (6); as well as A connecting unit is provided between the upper cover (1) and the bottom plate (2) and is used to connect the upper cover (1) and the bottom plate (2) so as to close or open the installation space.

2. A composite sensor for partial discharge monitoring of a high-voltage switch cabinet according to claim 1, characterized in that: The connection unit comprises at least one elastic block (10) and a clamping portion (9) arranged on the elastic block (10); the bottom plate (2) is provided with a mounting groove (13); the end of the elastic block (10) is fixedly arranged in the mounting groove (13); the side surface of the upper cover (1) is provided with a clamping groove (12); when the upper cover (1) is buckled onto the bottom plate (2), the clamping portion (9) is clamped into the clamping groove (12).

3. A composite sensor for partial discharge monitoring of a high-voltage switch cabinet according to claim 2, characterized in that: The clamping portion (9) is a wedge-shaped block, and the clamping groove (12) is a wedge-shaped groove.

4. A composite sensor for partial discharge monitoring of a high-voltage switch cabinet according to claim 3, characterized in that: The end of the elastic block (10) close to the clamping portion (9) extends upward to form an operating portion (11), and the operating portion (11) forms an angle with the elastic block (10).

5. A composite sensor for partial discharge monitoring of a high-voltage switch cabinet according to any one of claims 1 to 4, characterized in that: A positioning portion (8) is provided at the bottom of the upper cover (1); when the upper cover (1) is buckled onto the bottom plate (2), the positioning portion (8) is snap-fitted onto the bottom plate (2).

6. A composite sensor for partial discharge monitoring of high-voltage switch cabinet according to claim 1, characterized in that: The bottom plate (2) is provided with a plurality of honeycomb holes (4).

7. A composite sensor for partial discharge monitoring of a high-voltage switch cabinet according to claim 1, characterized in that: The upper cover (1) is provided with a conical opening (7) corresponding to the ultrasonic sensor (14), and the large end of the conical opening (7) is close to the upper end surface of the upper cover (1).

8. A composite sensor for partial discharge monitoring of a high-voltage switch cabinet according to claim 1 or 7, characterized in that: The upper end surface of the upper cover (1) is provided with a protective layer (3).

9. A composite sensor for partial discharge monitoring of high-voltage switch cabinet according to claim 1, characterized in that: The upper cover (1) is made of hard aluminum.

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