CN216646700U - Cable partial discharge detection device - Google Patents
Cable partial discharge detection device Download PDFInfo
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- CN216646700U CN216646700U CN202122635160.1U CN202122635160U CN216646700U CN 216646700 U CN216646700 U CN 216646700U CN 202122635160 U CN202122635160 U CN 202122635160U CN 216646700 U CN216646700 U CN 216646700U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model relates to a cable partial discharge detection device which is arranged on a high-voltage cable and comprises a first high-frequency current transformer, a second high-frequency current transformer, a third high-frequency current transformer and a processor, wherein the first high-frequency current transformer is sleeved on the outer side of an inner core of the cable, the second high-frequency current transformer is sleeved on the outer side of a grounding cable, and the third high-frequency current transformer is sleeved on the outer side of the high-voltage cable; the processor is respectively connected with the first high-frequency current transformer, the second high-frequency current transformer and the third high-frequency current transformer, the processor comprises an adding circuit and a subtracting circuit, the input end of the adding circuit is respectively connected with the first high-frequency current transformer and the second high-frequency current transformer, and the input end of the subtracting circuit is respectively connected with the output end of the adding circuit and the third high-frequency current transformer. Compared with the prior art, the method can effectively detect the partial discharge signal of the high-voltage cable joint, has high accuracy and can eliminate the interference caused by cable circulation.
Description
Technical Field
The utility model relates to the technical field of cable partial discharge detection, in particular to a cable partial discharge detection device.
Background
The high-voltage cable is used as a blood vessel of a city and provides energy required by city life. Once the cable fails. The influence on city life is immeasurable. The main fault position of the high-voltage circuit is a high-voltage cable connector. The detection of the high-voltage cable connector is well done, which is the key point for ensuring the stable work of the high-voltage cable.
The local discharge problem of the high-voltage XLPE cable is a main factor causing high-voltage cable accidents and has been widely concerned for years. The reason for this is that partial micro-discharge occurs mainly due to the presence of defects in the insulating parts of the cable. And the discharge process accelerates the deterioration of the insulation performance of the cable, eventually leading to the breakdown of the cable. How to measure the early partial discharge phenomenon of the cable has important significance for preventing cable accidents. On the other hand, the electric field stress of the power cable intermediate joint is concentrated, so that the electric field stress is a weak link of power cable insulation, and insulation faults are more easily caused. Statistically, most of the insulation breakdown problems of cables occur at the cable middle joint.
The cable joint partial discharge generating point is mainly concentrated on the high-voltage cable silicon rubber. If a specific location of the rubber insulation of the cable joint can be located. And carrying out data analysis on the fault problem of the rubber layer of the cable joint. And finding out the weak link of the rubber layer of the cable joint. Thereby being more beneficial to producing products with better qualification rate. The traditional partial discharge detection method, whether using an electromagnetic pulse method or an ultrasonic wave method, cannot realize the positioning function of the rubber layer. The traditional capacitive partial discharge detection can only detect the whole cable joint. The positioning function cannot be realized.
The cable partial discharge detection is always an important index for fault judgment of a cable joint, and common partial discharge detection at the cable joint comprises HFCT detection and capacitor piece partial discharge detection. The drawback of the HFCT partial discharge detection method is obvious, and firstly, the HFCT frequency response is a technical bottleneck, so that a higher frequency partial discharge signal cannot be detected. And the second is that the HFCT is arranged at two sides of the grounding connector. And is therefore disturbed by circulating currents on the earth line. The partial discharge signal is thus buried in the interference signal.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects that HFCTs are arranged on two sides of a grounding connector and are interfered by circulating currents on a grounding wire and partial discharge signals are easily buried in the interference signals in the prior art, and provide a cable partial discharge detection device.
The purpose of the utility model can be realized by the following technical scheme:
a cable partial discharge detection device is installed on a high-voltage cable and comprises a first high-frequency current transformer, a second high-frequency current transformer, a third high-frequency current transformer and a processor, wherein the first high-frequency current transformer is sleeved outside an inner core of the cable, the second high-frequency current transformer is sleeved outside a grounding cable, and the third high-frequency current transformer is sleeved outside the high-voltage cable;
the processor is respectively connected with the first high-frequency current transformer, the second high-frequency current transformer and the third high-frequency current transformer, the processor comprises an adding circuit and a subtracting circuit, the input end of the adding circuit is respectively connected with the first high-frequency current transformer and the second high-frequency current transformer, and the input end of the subtracting circuit is respectively connected with the output end of the adding circuit and the third high-frequency current transformer.
Further, the current frequency range of the response of the first high-frequency current transformer, the second high-frequency current transformer and the third high-frequency current transformer is 1M-200 Mhz.
Further, the magnetic core materials of the first high-frequency current transformer, the second high-frequency current transformer and the third high-frequency current transformer are all nickel-zinc ferrite.
Further, the response working frequency of the processor is within the range of 80-120 Mhz.
Further, the response operating frequency of the processor is 100 Mhz.
Furthermore, the processor is also connected with an analog-to-digital conversion circuit and a communication circuit, and the analog-to-digital conversion circuit is respectively connected with the subtraction circuit and the communication circuit.
Further, the cable partial discharge detection device further comprises a server, and the server is in communication connection with the communication circuit.
Further, the communication circuit is a WiFi module or a 4g module.
Further, the addition circuit and the subtraction circuit each include an operational amplifier.
Further, the processor further comprises a division circuit, and the division circuit is connected with the output end of the subtraction circuit.
Compared with the prior art, the utility model has the following advantages:
the utility model collects the high-frequency current signals on the cable inner core, the grounding cable and the high-voltage cable respectively as a signal 1, a signal 2 and a signal 3, and the utility model considers that the signal 3 is equal to the signal 1 plus the signal 2 when no partial discharge occurs, the partial discharge signals are reflected in the cable inner core and the grounding cable when the partial discharge occurs, and only weak partial discharge signals exist on the high-voltage cable, therefore, the addition and subtraction operation are carried out on the high-frequency current signals, the numerical value of the partial discharge signals can be directly obtained, the method can effectively detect the partial discharge signals of the high-voltage cable joint, the accuracy is high, and the interference caused by the cable circulation can be eliminated.
Drawings
Fig. 1 is a schematic view illustrating an installation state of a cable partial discharge detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a cable partial discharge detection apparatus according to an embodiment of the present invention;
in the figure, 1, a first high-frequency current transformer, 2, a second high-frequency current transformer, 3, a third high-frequency current transformer, 4, a processor, 401, an adding circuit, 402, a subtracting circuit, 403, a dividing circuit, 404, an analog-to-digital conversion circuit, 405, a communication circuit, 5, a cable core, 6, a grounding cable, 7 and a high-voltage cable.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example 1
As shown in fig. 1 and fig. 2, this embodiment provides a cable partial discharge detection device, which is installed on a high-voltage cable 7, and the cable partial discharge detection device includes a first high-frequency current transformer 1, a second high-frequency current transformer 2, a third high-frequency current transformer 3, and a processor 4, where the first high-frequency current transformer 1 is sleeved outside a cable core 5, the second high-frequency current transformer 2 is sleeved outside a grounding cable 6, and the third high-frequency current transformer 3 is sleeved outside the high-voltage cable 7;
the processor 4 is respectively connected with the first high-frequency current transformer 1, the second high-frequency current transformer 2 and the third high-frequency current transformer 3, the processor 4 comprises an adding circuit 401 and a subtracting circuit 402, the input end of the adding circuit 401 is respectively connected with the first high-frequency current transformer 1 and the second high-frequency current transformer 2, and the input end of the subtracting circuit 402 is respectively connected with the output end of the adding circuit 401 and the third high-frequency current transformer 3.
The working principle is as follows: the traditional cable partial discharge detection is only provided with a high-frequency current transformer on a grounding cable. Affected by cable circulation. The ground cable not only has partial discharge signals, but also has a lot of ground circulating current signals. To eliminate background interference. The scheme is added specially:
a first built-in high-frequency current transformer 1. The first high-frequency current transformer 1 is sleeved on the cable inner core 5 and used for collecting a high-frequency current signal of a core wire of a high-voltage cable;
and the second high-frequency current transformer 2 of the grounding cable is externally arranged on the grounding cable 6, and is used for collecting a high-frequency signal of the grounding cable 6.
And the third external high-frequency current transformer 3 is externally arranged on the high-voltage cable 7, and detects a high-frequency signal of the high-voltage cable 7.
When no partial discharge occurs, the third high-frequency current transformer 3 collects the high-frequency signal of the whole cable as the signal 3. The first high-frequency current transformer 1 collects a high-frequency signal of a core wire as a signal 1, and the second high-frequency current transformer 2 collects a high-frequency current signal of a cable armor layer as a signal 2. So signal 1 plus signal 2 equals signal 3. The signal 1 and the signal 2 are added, the signal 3 is compared with the sum of the adding circuit, subtraction is carried out, and the output result is 0.
When partial discharge occurs at a high-voltage cable joint, most of the partial discharge current flows through the cable core 5 to the cable-sheathed grounding cable 6. Only a small part of the partial discharge current is transmitted to the two ends through the cable body.
Therefore, the first high-frequency current transformer 1 and the second high-frequency current transformer 2 detect the partial discharge signal, and the signals are in the same direction. And the third high-frequency current transformer 3 can only detect partial discharge signals generated by a small number of cable joints. Corresponding to the arithmetic circuit designed above. And the signals 1 and 2 are added, the sum of the signal 3 and the adding circuit is compared, subtraction is carried out, and the output result is a double partial discharge signal.
The method can effectively detect the partial discharge signal of the high-voltage cable connector. And eliminates interference caused by cable circulation.
In this embodiment, the current frequency range to which the first high-frequency current transformer 1, the second high-frequency current transformer 2, and the third high-frequency current transformer 3 respond is 1M to 200 Mhz.
The magnetic core materials of the first high-frequency current transformer 1, the second high-frequency current transformer 2 and the third high-frequency current transformer 3 are all nickel-zinc ferrite.
The response operating frequency of the processor 4 is in the range of 80-120Mhz, preferably 100 Mhz.
The addition circuit 401 and the subtraction circuit 402 each include an operational amplifier.
In a preferred embodiment, in order to transmit the acquired partial discharge signal, the processor 4 is further connected to an analog-to-digital conversion circuit 404 and a communication circuit 405, and the analog-to-digital conversion circuit 404 is connected to the subtraction circuit 402 and the communication circuit 405, respectively.
Preferably, the cable partial discharge detection device further includes a server, and the server is communicatively connected to the communication circuit 405, and performs unified data storage and processing through the server.
In a preferred embodiment, the processor 4 further includes a dividing circuit 403, the dividing circuit 403 is connected to the output terminal of the subtracting circuit 402, and the divisor parameter of the dividing circuit 403 is set to 2, so as to realize the direct output of the magnitude of the partial discharge signal.
The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A cable partial discharge detection device is installed on a high-voltage cable (7), and is characterized by comprising a first high-frequency current transformer (1), a second high-frequency current transformer (2), a third high-frequency current transformer (3) and a processor (4), wherein the first high-frequency current transformer (1) is sleeved on the outer side of a cable inner core (5), the second high-frequency current transformer (2) is sleeved on the outer side of a grounding cable (6), and the third high-frequency current transformer (3) is sleeved on the outer side of the high-voltage cable (7);
the processor (4) is connected with the first high-frequency current transformer (1), the second high-frequency current transformer (2) and the third high-frequency current transformer (3) respectively, the processor (4) comprises an adding circuit (401) and a subtracting circuit (402), the input end of the adding circuit (401) is connected with the first high-frequency current transformer (1) and the second high-frequency current transformer (2) respectively, and the input end of the subtracting circuit (402) is connected with the output end of the adding circuit (401) and the third high-frequency current transformer (3) respectively.
2. The cable partial discharge detection device according to claim 1, wherein the first high frequency current transformer (1), the second high frequency current transformer (2) and the third high frequency current transformer (3) respond to a current frequency range of 1M to 200 Mhz.
3. The cable partial discharge detection device according to claim 1, wherein the magnetic core materials of the first high-frequency current transformer (1), the second high-frequency current transformer (2) and the third high-frequency current transformer (3) are all nickel-zinc ferrite.
4. A cable partial discharge detection device according to claim 1, wherein the processor (4) has a response operating frequency in the range of 80-120 Mhz.
5. A cable partial discharge detection device according to claim 1, characterized in that the processor (4) has a response operating frequency of 100 Mhz.
6. A cable partial discharge detection device according to claim 1, wherein the processor (4) is further connected to an analog-to-digital conversion circuit (404) and a communication circuit (405), and the analog-to-digital conversion circuit (404) is connected to the subtraction circuit (402) and the communication circuit (405), respectively.
7. The cable partial discharge detection device according to claim 6, further comprising a server communicatively coupled to the communication circuit (405).
8. The device according to claim 6, wherein the communication circuit (405) is a WiFi module or a 4g module.
9. A cable partial discharge detection apparatus according to claim 1, wherein the adding circuit (401) and the subtracting circuit (402) each comprise an operational amplifier.
10. A cable partial discharge detection device according to claim 1, characterized in that the processor (4) further comprises a division circuit (403), the division circuit (403) being connected to the output of the subtraction circuit (402).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122635160.1U CN216646700U (en) | 2021-10-29 | 2021-10-29 | Cable partial discharge detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122635160.1U CN216646700U (en) | 2021-10-29 | 2021-10-29 | Cable partial discharge detection device |
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| Publication Number | Publication Date |
|---|---|
| CN216646700U true CN216646700U (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122635160.1U Active CN216646700U (en) | 2021-10-29 | 2021-10-29 | Cable partial discharge detection device |
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| CN (1) | CN216646700U (en) |
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2021
- 2021-10-29 CN CN202122635160.1U patent/CN216646700U/en active Active
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