Partial discharge detection device for power equipment

Abstract

The present invention provides a partial discharge detection device for electric power equipment, which belongs to the technical field of partial discharge detection, and includes a guide part, a detection part and a detection terminal. The guide part is sleeved on the outside of the cable to be tested and can move along the cable to be tested. The detection part is sleeved on the outside of the guide part and can move along the guide part. When the guide part moves along the cable to be tested, the curled cable to be tested can be straightened. When the detection part moves along the guide part, it can move from one end of the cable to be tested to the other end, and is used to perform a comprehensive detection of the cable to be tested. When partial discharge exists in the cable to be tested, the detection part can generate an induced current based on the partial discharge current. Compared with the prior art, the embodiment of the present invention can avoid detection blind spots, can achieve comprehensive detection of the cable to be tested, and has the advantages of good detection effect and accurate and reliable detection structure.

Description

Technical Field

[0001] The invention belongs to the technical field of partial discharge detection, in particular to a partial discharge detection device for electric power equipment. Background Art

[0002] At present, the aging of power supply cables of power equipment is mostly caused by partial discharge. Therefore, it is necessary to conduct partial discharge detection on the power supply cables regularly to eliminate safety hazards.

[0003] In the prior art, partial discharge detection of power supply cables is mostly achieved by using cable lead-out signals. However, this method is limited by the detection occasions. In some occasions, high-voltage cables cannot be connected, that is, partial discharge detection cannot be performed. Some methods are implemented by placing an induction coil close to the power supply cable and observing whether the induction coil generates current based on the principle of current mutual induction. However, since some power supply cables are curled or bent inside the power equipment, the cables hidden inside cannot be detected by the induction coil, resulting in poor detection effect and low accuracy of the detection results. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a partial discharge detection device for electric power equipment.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A partial discharge detection device for electric power equipment comprises a guide part, a detection part and a detection terminal.

[0007] The guide portion is sleeved on the outside of the cable to be tested and can move along the cable to be tested.

[0008] The detection part is sleeved outside the guide part and can move along the guide part.

[0009] When the guide part moves along the cable to be tested, the curled cable to be tested can be straightened. When the detection part moves along the guide part, it can move from one end of the cable to be tested to the other end, so as to perform a comprehensive detection on the cable to be tested.

[0010] When partial discharge occurs in the cable to be tested, the detection unit may generate an induced current based on the partial discharge current, and the detection terminal is connected to the detection unit to receive the induced current and generate a partial discharge detection result.

[0011] As a further improvement of the present invention: the guide portion includes a plurality of support rods,

[0012] The support rods are distributed at intervals, and a space adapted to the cable to be tested is formed between the support rods. When the guide portion is sleeved outside the cable to be tested, the support rods are in a surrounding state with respect to the cable to be tested and fit against the side wall of the cable to be tested.

[0013] As a further improvement of the present invention: the detection part includes a support ring and a conductive wire coil wound around the outside of the support ring, and a plurality of support rods penetrate the support ring and slidably cooperate with the support ring.

[0014] As a further improvement of the present invention: the conductive wire coil is wound around the outside of the supporting ring in a spiral structure.

[0015] As a further improvement of the present invention: a bracket is fixedly provided on the inner wall of the support ring, a guide rail is provided on the side wall of the support rod along the length direction, and one end of the bracket away from the support ring is slidably matched with the guide rail.

[0016] As a further improvement of the present invention: a plurality of slots are provided on one side of the support rod, and a ball is movably embedded in each group of the slots.

[0017] As a further improvement of the present invention: the support ring comprises a first half body and a second half body,

[0018] The first half body and the second half body are connected to each other at one end and are detachably connected via a connecting piece at the other end.

[0019] As a further improvement of the present invention: the connecting member includes a plug hole opened at the end of the first half body and an insertion rod arranged at the end of the second half body,

[0020] When the first half body and the second half body are closed, the insertion rod can be inserted into the insertion hole to achieve the connection between the first half body and the second half body.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] When the embodiment of the present invention performs partial discharge detection on the cable to be tested, the guide part can be sleeved on the outside of the cable to be tested, so that one end of the guide part corresponds to one end of the cable to be tested, and the detection part is moved to one end of the guide part. At this time, the detection part is located at one end of the cable to be tested, and then the guide part is moved so that the guide part and the cable to be tested move relatively. When the guide part moves, the curled cable to be tested can be straightened, so that the cable to be tested can pass straight through the middle of the detection part to improve the detection effect; after the guide part moves from one end of the cable to be tested to the other end, the detection part can be moved from one end of the guide part to the other end, and at this time, the detection part is located at the other end of the cable to be tested. In this way, the detection part can perform partial discharge detection on the entire length of the cable to be tested. Compared with the prior art, it can avoid detection blind spots, and can achieve comprehensive detection of the cable to be tested, which has the advantages of good detection effect and accurate and reliable detection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a partial discharge detection device for power equipment Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of a partial discharge detection device for power equipment Figure 2 ;

[0025] Figure 3 It is a structural schematic diagram of a detection part in a partial discharge detection device for electric power equipment;

[0026] Figure 4 for Figure 1 A magnified schematic diagram of the middle A area;

[0027] Figure 5 for Figure 3 A magnified schematic diagram of the middle B area;

[0028] In the figure: 10 - cable to be tested, 20 - guide part, 201 - ball, 202 - support rod, 203 - guide rail, 204 - slot, 30 - detection part, 301 - support ring, 3011 - first half body, 3012 - second half body, 302 - bracket, 303 - conductor coil, 40 - connector, 401 - socket, 402 - plug rod. DETAILED DESCRIPTION

[0029] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying 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 a limitation on this patent.

[0032] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0033] See also Figure 1 and Figure 2 The present embodiment provides a partial discharge detection device for electric power equipment, comprising a guide portion 20, a detection portion 30 and a detection terminal, wherein the guide portion 20 is sleeved on the outside of a cable to be tested 10 and can move along the cable to be tested 10, the detection portion 30 is sleeved on the outside of the guide portion 20 and can move along the guide portion 20, when the guide portion 20 moves along the cable to be tested 10, the curled cable to be tested 10 can be straightened, when the detection portion 30 moves along the guide portion 20, it can move from one end of the cable to be tested 10 to the other end, and is used to perform a comprehensive detection on the cable to be tested 10, when partial discharge exists in the cable to be tested 10, the detection portion 30 can generate an induced current based on the partial discharge current, and the detection terminal is connected to the detection portion 30, and is used to receive the induced current and generate a partial discharge detection result.

[0034] When performing partial discharge detection on the cable 10 to be tested, the guide part 20 can be sleeved on the outside of the cable 10 to be tested, so that one end of the guide part 20 corresponds to one end of the cable 10 to be tested, and the detection part 30 is moved to one end of the guide part 20. At this time, the detection part 30 is located at one end of the cable 10 to be tested, and then the guide part 20 is moved (the guide part 20 is pushed along the length direction of the cable 10 to be tested or the cable 10 to be tested is directly pulled) so that the guide part 20 and the cable 10 to be tested move relative to each other. When the guide part 20 moves, the curled cable 10 to be tested can be straightened, so that the cable 10 to be tested can pass straight through the middle of the detection part 30 to improve the detection effect; after the guide part 20 moves from one end of the cable 10 to be tested to the other end, the detection part 30 can be moved from one end of the guide part 20 to the other end. At this time, the detection part 30 is located at the other end of the cable 10 to be tested, so that the detection part 30 can perform partial discharge detection on the entire length of the cable 10 to be tested.

[0035] See also Figure 1 and Figure 2 In one embodiment, the guide portion 20 includes a plurality of support rods 203, the support rods 203 are distributed at intervals, and a space adapted to the cable to be tested 10 is formed between the plurality of support rods 203. When the guide portion 20 is sleeved on the outside of the cable to be tested 10, the plurality of support rods 203 are in a surrounding state with respect to the cable to be tested 10 and are attached to the side wall of the cable to be tested 10.

[0036] By moving the plurality of support rods 202 along the length direction of the cable 10 to be tested, the plurality of support rods 202 can automatically straighten the cable 10 to be tested.

[0037] In another embodiment, the guide portion 20 may further include two groups of relatively distributed clamping rings and a plurality of connecting rods fixedly arranged between the two groups of clamping rings, the middle parts of the two groups of clamping rings have holes adapted to the cable 10 to be tested, and the plurality of connecting rods are distributed in a circular array about the holes.

[0038] By moving the two sets of clamping rings along the length direction of the cable 10 to be tested, the two sets of clamping rings can automatically straighten the cable 10 to be tested.

[0039] See also Figure 3 In one embodiment, the detection unit 30 includes a support ring 301 and a conductive wire coil 303 wound around the outside of the support ring 301 , and a plurality of the support rods 202 penetrate the support ring 301 and slide with the support ring 301 .

[0040] Before the test begins, a number of support rods 202 are wound around the outside of the cable 10 to be tested, and the support ring 301 is slid to one end of the support rods 202. The support rods 202 are moved along the length direction of the cable 10 to be tested. The support rods 202 can drive the support ring 301 to move synchronously. When local discharge occurs in the cable 10 to be tested, the conductive coil 303 can generate an induced current according to the local discharge current. The induced current is input to the detection terminal to generate a detection result, thereby realizing local discharge detection of the cable 10 to be tested.

[0041] In the above embodiment, the conductive coil 303 is wound around the outside of the supporting ring 301 in a spiral structure.

[0042] In another embodiment, the detection unit 30 may further include an induction coil, and the plurality of support rods 202 penetrate the induction coil and are slidably connected to the induction coil. When local discharge occurs in the cable 10 to be tested, the induction coil generates a corresponding induced current according to the current mutual induction principle and inputs the induced current into the detection terminal to generate a detection result, thereby realizing local discharge detection of the cable 10 to be tested.

[0043] In the above embodiment, the support ring 301 is a circular ring structure, but it can also be a square ring structure, which is not limited here.

[0044] See also Figure 1 and Figure 2 In one embodiment, a bracket 302 is fixedly provided on the inner wall of the support ring 301, and a guide rail 203 is provided on the side wall of the support rod 202 along the length direction. The end of the bracket 302 away from the support ring 301 is slidably matched with the guide rail 203 to facilitate relative movement between the support ring 301 and the support rod 202, so that the support ring 301 can be completely moved from one end of the cable 10 to be tested to the other end, thereby realizing comprehensive partial discharge detection of the cable 10 to be tested.

[0045] In one embodiment, the detection terminal can be an ammeter, or a voltmeter. When the detection terminal is a voltmeter, a converter can be connected to the input end of the voltmeter, and the induced current can be converted into a voltage signal in advance by the converter, and then transmitted to the voltmeter to generate a detection result. By observing the changes in the pointer of the ammeter or voltmeter, it can be determined whether there is a partial discharge phenomenon at the current position of the cable 10 to be tested.

[0046] See also Figure 4 In one embodiment, a plurality of slots 204 are provided on one side of the support rod 202, and a ball 201 is movably embedded in each group of the slots 204. By setting the ball 201, the friction force of the support rod 203 can be reduced when it moves along the cable 10 to be tested, thereby improving the convenience of movement.

[0047] See also Figure 3In one embodiment, the support ring 301 includes a first half body 3011 and a second half body 3012 , wherein the first half body 3011 and the second half body 3012 are connected to each other at one end and are detachably connected via a connector 40 at the other end.

[0048] Before testing, the first half body 3011 and the second half body 3012 can be unfolded to form a gap at one end of the first half body 3011 and the second half body 3012 for the cable 10 to be tested to enter. When the cable 10 to be tested enters between the first half body 3011 and the second half body 3012 from the gap, the first half body 3011 and the second half body 3012 are closed and connected as a whole by the connecting member 40. After the testing is completed, the first half body 3011 and the second half body 3012 can be detached at one end so that the first half body 3011 and the second half body 3012 are unfolded again, and the cable 10 to be tested can be taken out from the gap.

[0049] The above embodiment provides a method for installing the cable 10 to be tested. In another embodiment, one side of the support ring 301 may be provided with a notch to facilitate the installation of the cable 10 to be tested.

[0050] See also Figure 5 In one embodiment, the connecting member 40 includes a socket 401 opened at the end of the first half body 3011 and an insertion rod 402 arranged at the end of the second half body 3012. When the first half body 3011 and the second half body 3012 are closed, the insertion rod 402 can be inserted into the socket 401 to achieve the connection between the first half body 3011 and the second half body 3012.

[0051] In another embodiment, the connecting member 40 may further include a sleeve movably mounted on the end of the first half body 3011 and a rubber ring arranged on the inner wall of the sleeve. When the first half body 3011 and the second half body 3012 are closed, one end of the sleeve can be slidably mounted on the outside of the second half body 3012, and the rubber ring is attached to the outer wall of the second half body 3012. The damping effect between the rubber ring and the second half body 3012 is utilized to realize the connection between the first half body 3011 and the second half body 3012.

[0052] When the embodiment of the present invention performs partial discharge detection on the cable 10 to be tested, the guide portion 20 can be sleeved on the outside of the cable 10 to be tested, so that one end of the guide portion 20 corresponds to one end of the cable 10 to be tested, and the detection portion 30 is moved to one end of the guide portion 20. At this time, the detection portion 30 is located at one end of the cable 10 to be tested, and then the guide portion 20 is moved (the guide portion 20 is pushed along the length direction of the cable 10 to be tested or the cable 10 to be tested is directly pulled) so that the guide portion 20 and the cable 10 to be tested move relative to each other. When the guide portion 20 moves, the curled cable 10 to be tested can be tested. Straighten it so that the cable 10 to be tested can pass straight through the middle of the detection part 30 to improve the detection effect; after the guide part 20 is moved from one end of the cable 10 to the other end, the detection part 30 can be moved from one end of the guide part 20 to the other end. At this time, the detection part 30 is located at the other end of the cable 10 to be tested. In this way, the detection part 30 can perform partial discharge detection on the entire length of the cable 10 to be tested. Compared with the prior art, it can avoid detection blind spots and realize comprehensive detection of the cable 10 to be tested, which has the advantages of good detection effect and accurate and reliable detection structure.

[0053] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A partial discharge detection device for electric power equipment, characterized in that: It includes a guide part, a detection part and a detection terminal. The guide portion is sleeved on the outside of the cable to be tested and can move along the cable to be tested. The detection part is sleeved outside the guide part and can move along the guide part. When the guide part moves along the cable to be tested, the curled cable to be tested can be straightened. When the detection part moves along the guide part, it can move from one end of the cable to be tested to the other end, so as to perform a comprehensive detection on the cable to be tested. When partial discharge occurs in the cable to be tested, the detection unit may generate an induced current based on the partial discharge current, and the detection terminal is connected to the detection unit to receive the induced current and generate a partial discharge detection result. The guide part includes a plurality of support rods. The support rods are distributed at intervals, and a space adapted to the cable to be tested is formed between the support rods. When the guide portion is sleeved on the outside of the cable to be tested, the support rods are in a surrounding state with respect to the cable to be tested and fit against the side wall of the cable to be tested. The detection part includes a support ring and a conductive wire coil wound around the outside of the support ring, and a plurality of support rods penetrate the support ring and are slidably matched with the support ring.

2. A partial discharge detection device for electric power equipment according to claim 1, characterized in that: The conductive coil is spirally wound outside the supporting ring.

3. A partial discharge detection device for electric power equipment according to claim 1 or 2, characterized in that: A bracket is fixedly arranged on the inner wall of the support ring, a guide rail is arranged on the side wall of the support rod along the length direction, and one end of the bracket away from the support ring is slidably matched with the guide rail.

4. The partial discharge detection device for electric power equipment according to claim 1, characterized in that: A plurality of slots are provided on one side of the support rod, and a ball is movably embedded in each group of the slots.

5. The partial discharge detection device for electric power equipment according to claim 1, characterized in that: The support ring comprises a first half body and a second half body, The first half body and the second half body are connected to each other at one end and are detachably connected via a connecting piece at the other end.

6. A partial discharge detection device for electric power equipment according to claim 5, characterized in that: The connecting member includes a socket opened at the end of the first half body and an insertion rod arranged at the end of the second half body, When the first half body and the second half body are closed, the insertion rod can be inserted into the insertion hole to achieve the connection between the first half body and the second half body.

Images